fix(app-lib/minecraft_skins): fix custom skin removal from DB not working

tweak(app-lib): improve consistency of skin field serialization case
fix: less racy auth token refresh logic
2025-06-14 16:22:54 +02:00 · 2025-06-14 16:22:54 +02:00 · 2025-06-14 16:22:54 +02:00 · 2025-06-14 16:22:53 +02:00 · 2025-06-14 16:22:53 +02:00 · 2025-06-14 16:22:52 +02:00
36 changed files with 1941 additions and 145 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -1974,6 +1974,12 @@ version = "2.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a2330da5de22e8a3cb63252ce2abb30116bf5265e89c0e01bc17015ce30a476"

+[[package]]
+name = "data-url"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c297a1c74b71ae29df00c3e22dd9534821d60eb9af5a0192823fa2acea70c2a"
+
 [[package]]
 name = "deadpool"
 version = "0.12.2"
@ -7989,6 +7995,7 @@ dependencies = [
 "tokio-stream",
 "tracing",
 "url",
+ "uuid 1.16.0",
 "webpki-roots 0.26.11",
 ]

@ -8071,6 +8078,7 @@ dependencies = [
 "stringprep",
 "thiserror 2.0.12",
 "tracing",
+ "uuid 1.16.0",
 "whoami",
 ]

@ -8110,6 +8118,7 @@ dependencies = [
 "stringprep",
 "thiserror 2.0.12",
 "tracing",
+ "uuid 1.16.0",
 "whoami",
 ]

@ -8136,6 +8145,7 @@ dependencies = [
 "thiserror 2.0.12",
 "tracing",
 "url",
+ "uuid 1.16.0",
 ]

 [[package]]
@ -8880,6 +8890,7 @@ dependencies = [
 "chrono",
 "daedalus",
 "dashmap",
+ "data-url",
 "dirs",
 "discord-rich-presence",
 "dunce",
@ -8889,6 +8900,7 @@ dependencies = [
 "flate2",
 "fs4",
 "futures",
+ "heck 0.5.0",
 "hickory-resolver",
 "indicatif",
 "notify",
--- a/Cargo.toml
+++ b/Cargo.toml
@ -47,6 +47,7 @@ color-thief = "0.2.2"
 console-subscriber = "0.4.1"
 daedalus = { path = "packages/daedalus" }
 dashmap = "6.1.0"
+data-url = "0.3.1"
 deadpool-redis = "0.21.1"
 dirs = "6.0.0"
 discord-rich-presence = "0.2.5"
@ -60,6 +61,7 @@ flate2 = "1.1.2"
 fs4 = { version = "0.13.1", default-features = false }
 futures = { version = "0.3.31", default-features = false }
 futures-util = "0.3.31"
+heck = "0.5.0"
 hex = "0.4.3"
 hickory-resolver = "0.25.2"
 hmac = "0.12.1"
--- a/apps/app-frontend/src/components/ui/AccountsCard.vue
+++ b/apps/app-frontend/src/components/ui/AccountsCard.vue
@ -10,12 +10,12 @@
      size="36px"
      :src="
        selectedAccount
-          ? `https://mc-heads.net/avatar/${selectedAccount.id}/128`
+          ? `https://mc-heads.net/avatar/${selectedAccount.profile.id}/128`
          : 'https://launcher-files.modrinth.com/assets/steve_head.png'
      "
    />
    <div class="flex flex-col w-full">
-      <span>{{ selectedAccount ? selectedAccount.username : 'Select account' }}</span>
+      <span>{{ selectedAccount ? selectedAccount.profile.name : 'Select account' }}</span>
      <span class="text-secondary text-xs">Minecraft account</span>
    </div>
    <DropdownIcon class="w-5 h-5 shrink-0" />
@ -28,12 +28,17 @@
      :class="{ expanded: mode === 'expanded', isolated: mode === 'isolated' }"
    >
      <div v-if="selectedAccount" class="selected account">
-        <Avatar size="xs" :src="`https://mc-heads.net/avatar/${selectedAccount.id}/128`" />
+        <Avatar size="xs" :src="`https://mc-heads.net/avatar/${selectedAccount.profile.id}/128`" />
        <div>
-          <h4>{{ selectedAccount.username }}</h4>
+          <h4>{{ selectedAccount.profile.name }}</h4>
          <p>Selected</p>
        </div>
-        <Button v-tooltip="'Log out'" icon-only color="raised" @click="logout(selectedAccount.id)">
+        <Button
+          v-tooltip="'Log out'"
+          icon-only
+          color="raised"
+          @click="logout(selectedAccount.profile.id)"
+        >
          <TrashIcon />
        </Button>
      </div>
@ -44,12 +49,12 @@
        </Button>
      </div>
      <div v-if="displayAccounts.length > 0" class="account-group">
-        <div v-for="account in displayAccounts" :key="account.id" class="account-row">
+        <div v-for="account in displayAccounts" :key="account.profile.id" class="account-row">
          <Button class="option account" @click="setAccount(account)">
-            <Avatar :src="`https://mc-heads.net/avatar/${account.id}/128`" class="icon" />
-            <p>{{ account.username }}</p>
+            <Avatar :src="`https://mc-heads.net/avatar/${account.profile.id}/128`" class="icon" />
+            <p>{{ account.profile.name }}</p>
          </Button>
-          <Button v-tooltip="'Log out'" icon-only @click="logout(account.id)">
+          <Button v-tooltip="'Log out'" icon-only @click="logout(account.profile.id)">
            <TrashIcon />
          </Button>
        </div>
@ -101,16 +106,16 @@ defineExpose({
 await refreshValues()

 const displayAccounts = computed(() =>
-  accounts.value.filter((account) => defaultUser.value !== account.id),
+  accounts.value.filter((account) => defaultUser.value !== account.profile.id),
 )

 const selectedAccount = computed(() =>
-  accounts.value.find((account) => account.id === defaultUser.value),
+  accounts.value.find((account) => account.profile.id === defaultUser.value),
 )

 async function setAccount(account) {
-  defaultUser.value = account.id
-  await set_default_user(account.id).catch(handleError)
+  defaultUser.value = account.profile.id
+  await set_default_user(account.profile.id).catch(handleError)
  emit('change')
 }

--- a/apps/app-frontend/src/components/ui/ErrorModal.vue
+++ b/apps/app-frontend/src/components/ui/ErrorModal.vue
@ -92,7 +92,7 @@ async function loginMinecraft() {
    const loggedIn = await login_flow()

    if (loggedIn) {
-      await set_default_user(loggedIn.id).catch(handleError)
+      await set_default_user(loggedIn.profile.id).catch(handleError)
    }

    await trackEvent('AccountLogIn', { source: 'ErrorModal' })
--- a/apps/app-playground/src/main.rs
+++ b/apps/app-playground/src/main.rs
@ -27,7 +27,10 @@ pub async fn authenticate_run() -> theseus::Result<Credentials> {

    let credentials = minecraft_auth::finish_login(&input, login).await?;

-    println!("Logged in user {}.", credentials.username);
+    println!(
+        "Logged in user {}.",
+        credentials.maybe_online_profile().await.name
+    );
    Ok(credentials)
 }

--- a/apps/app/build.rs
+++ b/apps/app/build.rs
@ -99,6 +99,22 @@ fn main() {
                        DefaultPermissionRule::AllowAllCommands,
                    ),
            )
+            .plugin(
+                "minecraft-skins",
+                InlinedPlugin::new()
+                    .commands(&[
+                        "get_available_capes",
+                        "get_available_skins",
+                        "add_and_equip_custom_skin",
+                        "set_default_cape",
+                        "equip_skin",
+                        "remove_custom_skin",
+                        "unequip_skin",
+                    ])
+                    .default_permission(
+                        DefaultPermissionRule::AllowAllCommands,
+                    ),
+            )
            .plugin(
                "mr-auth",
                InlinedPlugin::new()
@ -151,7 +167,6 @@ fn main() {
                        "profile_update_managed_modrinth_version",
                        "profile_repair_managed_modrinth",
                        "profile_run",
-                        "profile_run_credentials",
                        "profile_kill",
                        "profile_edit",
                        "profile_edit_icon",
--- a/apps/app/capabilities/plugins.json
+++ b/apps/app/capabilities/plugins.json
@ -25,6 +25,7 @@
    "jre:default",
    "logs:default",
    "metadata:default",
+    "minecraft-skins:default",
    "mr-auth:default",
    "profile-create:default",
    "pack:default",
--- a/apps/app/src/api/minecraft_skins.rs
+++ b/apps/app/src/api/minecraft_skins.rs
@ -0,0 +1,82 @@
+use crate::api::Result;
+
+use theseus::minecraft_skins::{self, Bytes, Cape, MinecraftSkinVariant, Skin};
+
+pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
+    tauri::plugin::Builder::new("minecraft-skins")
+        .invoke_handler(tauri::generate_handler![
+            get_available_capes,
+            get_available_skins,
+            add_and_equip_custom_skin,
+            set_default_cape,
+            equip_skin,
+            remove_custom_skin,
+            unequip_skin,
+        ])
+        .build()
+}
+
+/// `invoke('plugin:minecraft-skins|get_available_capes')`
+///
+/// See also: [minecraft_skins::get_available_capes]
+#[tauri::command]
+pub async fn get_available_capes() -> Result<Vec<Cape>> {
+    Ok(minecraft_skins::get_available_capes().await?)
+}
+
+/// `invoke('plugin:minecraft-skins|get_available_skins')`
+///
+/// See also: [minecraft_skins::get_available_skins]
+#[tauri::command]
+pub async fn get_available_skins() -> Result<Vec<Skin>> {
+    Ok(minecraft_skins::get_available_skins().await?)
+}
+
+/// `invoke('plugin:minecraft-skins|add_and_equip_custom_skin', texture_blob, variant, cape_override)`
+///
+/// See also: [minecraft_skins::add_and_equip_custom_skin]
+#[tauri::command]
+pub async fn add_and_equip_custom_skin(
+    texture_blob: Bytes,
+    variant: MinecraftSkinVariant,
+    cape_override: Option<Cape>,
+) -> Result<()> {
+    Ok(minecraft_skins::add_and_equip_custom_skin(
+        texture_blob,
+        variant,
+        cape_override,
+    )
+    .await?)
+}
+
+/// `invoke('plugin:minecraft-skins|set_default_cape', cape)`
+///
+/// See also: [minecraft_skins::set_default_cape]
+#[tauri::command]
+pub async fn set_default_cape(cape: Option<Cape>) -> Result<()> {
+    Ok(minecraft_skins::set_default_cape(cape).await?)
+}
+
+/// `invoke('plugin:minecraft-skins|equip_skin', skin)`
+///
+/// See also: [minecraft_skins::equip_skin]
+#[tauri::command]
+pub async fn equip_skin(skin: Skin) -> Result<()> {
+    Ok(minecraft_skins::equip_skin(skin).await?)
+}
+
+/// `invoke('plugin:minecraft-skins|remove_custom_skin', skin)`
+///
+/// See also: [minecraft_skins::remove_custom_skin]
+#[tauri::command]
+pub async fn remove_custom_skin(skin: Skin) -> Result<()> {
+    Ok(minecraft_skins::remove_custom_skin(skin).await?)
+}
+
+/// `invoke('plugin:minecraft-skins|unequip_skin')`
+///
+/// See also: [minecraft_skins::unequip_skin]
+#[tauri::command]
+pub async fn unequip_skin() -> Result<()> {
+    Ok(minecraft_skins::unequip_skin().await?)
+}
--- a/apps/app/src/api/mod.rs
+++ b/apps/app/src/api/mod.rs
@ -7,6 +7,7 @@ pub mod import;
 pub mod jre;
 pub mod logs;
 pub mod metadata;
+pub mod minecraft_skins;
 pub mod mr_auth;
 pub mod pack;
 pub mod process;
--- a/apps/app/src/api/profile.rs
+++ b/apps/app/src/api/profile.rs
@ -28,7 +28,6 @@ pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
            profile_update_managed_modrinth_version,
            profile_repair_managed_modrinth,
            profile_run,
-            profile_run_credentials,
            profile_kill,
            profile_edit,
            profile_edit_icon,
@ -256,22 +255,6 @@ pub async fn profile_run(path: &str) -> Result<ProcessMetadata> {
    Ok(process)
 }

-// Run Minecraft using a profile using chosen credentials
-// Returns the UUID, which can be used to poll
-// for the actual Child in the state.
-// invoke('plugin:profile|profile_run_credentials', {path, credentials})')
-#[tauri::command]
-pub async fn profile_run_credentials(
-    path: &str,
-    credentials: Credentials,
-) -> Result<ProcessMetadata> {
-    let process =
-        profile::run_credentials(path, &credentials, &QuickPlayType::None)
-            .await?;
-
-    Ok(process)
-}
-
 #[tauri::command]
 pub async fn profile_kill(path: &str) -> Result<()> {
    profile::kill(path).await?;
--- a/apps/app/src/main.rs
+++ b/apps/app/src/main.rs
@ -248,6 +248,7 @@ fn main() {
        .plugin(api::logs::init())
        .plugin(api::jre::init())
        .plugin(api::metadata::init())
+        .plugin(api::minecraft_skins::init())
        .plugin(api::pack::init())
        .plugin(api::process::init())
        .plugin(api::profile::init())
--- a/packages/app-lib/.sqlx/query-1937e191a7815a55274bb39a035e02a39bb04b45dbd727e5db5b5308deda4e04.json
+++ b/packages/app-lib/.sqlx/query-1937e191a7815a55274bb39a035e02a39bb04b45dbd727e5db5b5308deda4e04.json
@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "DELETE FROM custom_minecraft_skins WHERE minecraft_user_uuid = ? AND texture_key = ? AND variant = ? AND cape_id = ?",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 4
+    },
+    "nullable": []
+  },
+  "hash": "1937e191a7815a55274bb39a035e02a39bb04b45dbd727e5db5b5308deda4e04"
+}
--- a/packages/app-lib/.sqlx/query-27a4ca00ab9d1647bf63287169f6dd3eed86ba421c83e74fe284609a8020bd22.json
+++ b/packages/app-lib/.sqlx/query-27a4ca00ab9d1647bf63287169f6dd3eed86ba421c83e74fe284609a8020bd22.json
@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "DELETE FROM default_minecraft_capes WHERE minecraft_user_uuid = ?",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": []
+  },
+  "hash": "27a4ca00ab9d1647bf63287169f6dd3eed86ba421c83e74fe284609a8020bd22"
+}
--- a/packages/app-lib/.sqlx/query-3d15e7eb66971e70500e8718236fbdbd066d51f88cd2bcfed613f756edbd2944.json
+++ b/packages/app-lib/.sqlx/query-3d15e7eb66971e70500e8718236fbdbd066d51f88cd2bcfed613f756edbd2944.json
@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "INSERT OR REPLACE INTO default_minecraft_capes (minecraft_user_uuid, id) VALUES (?, ?)",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 2
+    },
+    "nullable": []
+  },
+  "hash": "3d15e7eb66971e70500e8718236fbdbd066d51f88cd2bcfed613f756edbd2944"
+}
--- a/packages/app-lib/.sqlx/query-3f3d3c2d77c1bcaf4044b612c3822546583aa19ea7088682d718c64ed5d5f1c5.json
+++ b/packages/app-lib/.sqlx/query-3f3d3c2d77c1bcaf4044b612c3822546583aa19ea7088682d718c64ed5d5f1c5.json
@ -0,0 +1,20 @@
+{
+  "db_name": "SQLite",
+  "query": "SELECT texture FROM custom_minecraft_skin_textures WHERE texture_key = ?",
+  "describe": {
+    "columns": [
+      {
+        "name": "texture",
+        "ordinal": 0,
+        "type_info": "Blob"
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      false
+    ]
+  },
+  "hash": "3f3d3c2d77c1bcaf4044b612c3822546583aa19ea7088682d718c64ed5d5f1c5"
+}
--- a/packages/app-lib/.sqlx/query-545b01d8cc1e79ff5d4136887fbb712aba58908a66dd7bbd64c293b9ee7a1523.json
+++ b/packages/app-lib/.sqlx/query-545b01d8cc1e79ff5d4136887fbb712aba58908a66dd7bbd64c293b9ee7a1523.json
@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "INSERT OR REPLACE INTO custom_minecraft_skin_textures (texture_key, texture) VALUES (?, ?)",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 2
+    },
+    "nullable": []
+  },
+  "hash": "545b01d8cc1e79ff5d4136887fbb712aba58908a66dd7bbd64c293b9ee7a1523"
+}
--- a/packages/app-lib/.sqlx/query-957f184e28e4921ff3922f3e74aae58e2d7a414e76906700518806e494cd0246.json
+++ b/packages/app-lib/.sqlx/query-957f184e28e4921ff3922f3e74aae58e2d7a414e76906700518806e494cd0246.json
@ -0,0 +1,20 @@
+{
+  "db_name": "SQLite",
+  "query": "SELECT id AS 'id: Hyphenated' FROM default_minecraft_capes WHERE minecraft_user_uuid = ?",
+  "describe": {
+    "columns": [
+      {
+        "name": "id: Hyphenated",
+        "ordinal": 0,
+        "type_info": "Text"
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      false
+    ]
+  },
+  "hash": "957f184e28e4921ff3922f3e74aae58e2d7a414e76906700518806e494cd0246"
+}
--- a/packages/app-lib/.sqlx/query-9c2522e4518067192539ad270253ae1b3d75e80e52529e491e86ff370d6424b3.json
+++ b/packages/app-lib/.sqlx/query-9c2522e4518067192539ad270253ae1b3d75e80e52529e491e86ff370d6424b3.json
@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "INSERT OR IGNORE INTO custom_minecraft_skins (minecraft_user_uuid, texture_key, variant, cape_id) VALUES (?, ?, ?, ?)",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 4
+    },
+    "nullable": []
+  },
+  "hash": "9c2522e4518067192539ad270253ae1b3d75e80e52529e491e86ff370d6424b3"
+}
--- a/packages/app-lib/.sqlx/query-aae88809ada53e13441352e315f68169cfd8226b57bacd8c270d7777fc6883ac.json
+++ b/packages/app-lib/.sqlx/query-aae88809ada53e13441352e315f68169cfd8226b57bacd8c270d7777fc6883ac.json
@ -0,0 +1,32 @@
+{
+  "db_name": "SQLite",
+  "query": "SELECT texture_key, variant AS 'variant: MinecraftSkinVariant', cape_id AS 'cape_id: Hyphenated' FROM custom_minecraft_skins WHERE minecraft_user_uuid = ? ORDER BY rowid ASC LIMIT ? OFFSET ?",
+  "describe": {
+    "columns": [
+      {
+        "name": "texture_key",
+        "ordinal": 0,
+        "type_info": "Text"
+      },
+      {
+        "name": "variant: MinecraftSkinVariant",
+        "ordinal": 1,
+        "type_info": "Text"
+      },
+      {
+        "name": "cape_id: Hyphenated",
+        "ordinal": 2,
+        "type_info": "Text"
+      }
+    ],
+    "parameters": {
+      "Right": 3
+    },
+    "nullable": [
+      false,
+      false,
+      true
+    ]
+  },
+  "hash": "aae88809ada53e13441352e315f68169cfd8226b57bacd8c270d7777fc6883ac"
+}
--- a/packages/app-lib/Cargo.toml
+++ b/packages/app-lib/Cargo.toml
@ -5,7 +5,7 @@ authors = ["Jai A <jaiagr+gpg@pm.me>"]
 edition.workspace = true

 [dependencies]
-bytes.workspace = true
+bytes = { workspace = true, features = ["serde"] }
 serde = { workspace = true, features = ["derive"] }
 serde_json.workspace = true
 serde_ini.workspace = true
@ -32,19 +32,21 @@ regex.workspace = true
 sysinfo = { workspace = true, features = ["system", "disk"] }
 thiserror.workspace = true
 either.workspace = true
+data-url.workspace = true

 tracing.workspace = true
 tracing-subscriber = { workspace = true, features = ["chrono", "env-filter"] }
 tracing-error.workspace = true

 paste.workspace = true
+heck.workspace = true

 tauri = { workspace = true, optional = true }
 indicatif = { workspace = true, optional = true }

 async-tungstenite = { workspace = true, features = ["tokio-runtime", "tokio-rustls-webpki-roots"] }
 futures = { workspace = true, features = ["async-await", "alloc"] }
-reqwest = { workspace = true, features = ["json", "stream", "deflate", "gzip", "brotli", "rustls-tls-webpki-roots", "charset", "http2", "macos-system-configuration"] }
+reqwest = { workspace = true, features = ["json", "stream", "deflate", "gzip", "brotli", "rustls-tls-webpki-roots", "charset", "http2", "macos-system-configuration", "multipart"] }
 tokio = { workspace = true, features = ["time", "io-util", "net", "sync", "fs", "macros", "process"] }
 tokio-util = { workspace = true, features = ["compat"] }
 async-recursion.workspace = true
@ -65,7 +67,7 @@ p256 = { workspace = true, features = ["ecdsa"] }
 rand.workspace = true
 base64.workspace = true

-sqlx = { workspace = true, features = ["runtime-tokio", "sqlite", "macros", "migrate", "json"] }
+sqlx = { workspace = true, features = ["runtime-tokio", "sqlite", "macros", "migrate", "json", "uuid"] }

 quartz_nbt = { workspace = true, features = ["serde"] }
 hickory-resolver.workspace = true
--- a/packages/app-lib/migrations/20250413162050_skin-selector.sql
+++ b/packages/app-lib/migrations/20250413162050_skin-selector.sql
@ -0,0 +1,36 @@
+CREATE TABLE default_minecraft_capes (
+    minecraft_user_uuid TEXT NOT NULL,
+    id TEXT NOT NULL,
+
+    PRIMARY KEY (minecraft_user_uuid, id),
+    FOREIGN KEY (minecraft_user_uuid) REFERENCES minecraft_users(uuid)
+        ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+CREATE TABLE custom_minecraft_skins (
+    minecraft_user_uuid TEXT NOT NULL,
+    texture_key TEXT NOT NULL,
+    variant TEXT NOT NULL CHECK (variant IN ('CLASSIC', 'SLIM', 'UNKNOWN')),
+    cape_id TEXT,
+
+    PRIMARY KEY (minecraft_user_uuid, texture_key, variant, cape_id),
+    FOREIGN KEY (minecraft_user_uuid) REFERENCES minecraft_users(uuid)
+        ON DELETE CASCADE ON UPDATE CASCADE,
+    FOREIGN KEY (texture_key) REFERENCES custom_minecraft_skin_textures(texture_key)
+        ON DELETE CASCADE ON UPDATE CASCADE DEFERRABLE INITIALLY DEFERRED
+);
+
+CREATE TABLE custom_minecraft_skin_textures (
+    texture_key TEXT NOT NULL,
+    texture PNG BLOB NOT NULL,
+
+    PRIMARY KEY (texture_key)
+);
+
+CREATE TRIGGER custom_minecraft_skin_texture_delete_cleanup
+    AFTER DELETE ON custom_minecraft_skins FOR EACH ROW
+    BEGIN
+        DELETE FROM custom_minecraft_skin_textures WHERE texture_key NOT IN (
+            SELECT texture_key FROM custom_minecraft_skins
+        );
+    END;
--- a/packages/app-lib/src/api/logs.rs
+++ b/packages/app-lib/src/api/logs.rs
@ -39,21 +39,27 @@ pub struct LatestLogCursor {
 #[serde(transparent)]
 pub struct CensoredString(String);
 impl CensoredString {
-    pub fn censor(mut s: String, credentials_set: &Vec<Credentials>) -> Self {
+    pub fn censor(mut s: String, credentials_list: &[Credentials]) -> Self {
        let username = whoami::username();
        s = s
            .replace(&format!("/{username}/"), "/{COMPUTER_USERNAME}/")
            .replace(&format!("\\{username}\\"), "\\{COMPUTER_USERNAME}\\");
-        for credentials in credentials_set {
+        for credentials in credentials_list {
+            // Use the offline profile to guarantee that this function does not cause
+            // Mojang API request, and is never delayed by a network request. The offline
+            // profile is optimistically updated on upsert from time to time anyway
            s = s
                .replace(&credentials.access_token, "{MINECRAFT_ACCESS_TOKEN}")
-                .replace(&credentials.username, "{MINECRAFT_USERNAME}")
                .replace(
-                    &credentials.id.as_simple().to_string(),
+                    &credentials.offline_profile.name,
+                    "{MINECRAFT_USERNAME}",
+                )
+                .replace(
+                    &credentials.offline_profile.id.as_simple().to_string(),
                    "{MINECRAFT_UUID}",
                )
                .replace(
-                    &credentials.id.as_hyphenated().to_string(),
+                    &credentials.offline_profile.id.as_hyphenated().to_string(),
                    "{MINECRAFT_UUID}",
                );
        }
@ -210,7 +216,7 @@ pub async fn get_output_by_filename(
        .await?
        .into_iter()
        .map(|x| x.1)
-        .collect();
+        .collect::<Vec<_>>();

    // Load .gz file into String
    if let Some(ext) = path.extension() {
@ -350,7 +356,7 @@ pub async fn get_generic_live_log_cursor(
        .await?
        .into_iter()
        .map(|x| x.1)
-        .collect();
+        .collect::<Vec<_>>();
    let output = CensoredString::censor(output, &credentials);
    Ok(LatestLogCursor {
        cursor,
--- a/packages/app-lib/src/api/minecraft_auth.rs
+++ b/packages/app-lib/src/api/minecraft_auth.rs
@ -23,8 +23,8 @@ pub async fn finish_login(
 #[tracing::instrument]
 pub async fn get_default_user() -> crate::Result<Option<uuid::Uuid>> {
    let state = State::get().await?;
-    let users = Credentials::get_active(&state.pool).await?;
-    Ok(users.map(|x| x.id))
+    let user = Credentials::get_active(&state.pool).await?;
+    Ok(user.map(|user| user.offline_profile.id))
 }

 #[tracing::instrument]
--- a/packages/app-lib/src/api/minecraft_skins.rs
+++ b/packages/app-lib/src/api/minecraft_skins.rs
@ -0,0 +1,540 @@
+//! Theseus skin management interface
+
+use std::{
+    borrow::Cow,
+    sync::{
+        Arc,
+        atomic::{AtomicBool, Ordering},
+    },
+};
+
+use base64::Engine;
+pub use bytes::Bytes;
+use data_url::DataUrl;
+use futures::{Stream, StreamExt, TryStreamExt, future::Either, stream};
+use serde::{Deserialize, Serialize};
+use url::Url;
+use uuid::Uuid;
+
+pub use crate::state::MinecraftSkinVariant;
+use crate::{
+    ErrorKind, State,
+    state::{
+        MinecraftCharacterExpressionState, MinecraftProfile,
+        minecraft_skins::{
+            CustomMinecraftSkin, DefaultMinecraftCape, mojang_api,
+        },
+    },
+    util::fetch::REQWEST_CLIENT,
+};
+
+use super::data::Credentials;
+
+mod assets {
+    mod default {
+        mod default_skins;
+        pub use default_skins::DEFAULT_SKINS;
+    }
+    pub use default::DEFAULT_SKINS;
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+pub struct Cape {
+    /// An identifier for this cape, potentially unique to the owning player.
+    pub id: Uuid,
+    /// The name of the cape.
+    pub name: Arc<str>,
+    /// The URL of the cape PNG texture.
+    pub texture: Arc<Url>,
+    /// Whether the cape is the default one, used when the currently selected cape does not
+    /// override it.
+    pub is_default: bool,
+    /// Whether the cape is currently equipped in the Minecraft profile of its corresponding
+    /// player.
+    pub is_equipped: bool,
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+pub struct Skin {
+    /// An opaque identifier for the skin texture, which can be used to identify it.
+    pub texture_key: Arc<str>,
+    /// The name of the skin, if available.
+    pub name: Option<Arc<str>>,
+    /// The variant of the skin model.
+    pub variant: MinecraftSkinVariant,
+    /// The UUID of the cape that this skin uses, if any.
+    ///
+    /// If `None`, the skin does not have an explicit cape set, and the default cape for
+    /// this player, if any, should be used.
+    pub cape_id: Option<Uuid>,
+    /// The URL of the skin PNG texture. Can also be a data URL.
+    pub texture: Arc<Url>,
+    /// The source of the skin, which represents how the app knows about it.
+    pub source: SkinSource,
+    /// Whether the skin is currently equipped in the Minecraft profile of its corresponding
+    /// player.
+    pub is_equipped: bool,
+}
+
+impl Skin {
+    /// Resolves the skin texture URL to a stream of bytes.
+    pub async fn resolve_texture(
+        &self,
+    ) -> crate::Result<impl Stream<Item = Result<Bytes, reqwest::Error>> + use<>>
+    {
+        if self.texture.scheme() == "data" {
+            let data = DataUrl::process(self.texture.as_str())?
+                .decode_to_vec()?
+                .0
+                .into();
+
+            Ok(Either::Left(stream::once(async { Ok(data) })))
+        } else {
+            let response = REQWEST_CLIENT
+                .get(self.texture.as_str())
+                .header("Accept", "image/png")
+                .send()
+                .await
+                .and_then(|response| response.error_for_status())?;
+
+            Ok(Either::Right(response.bytes_stream()))
+        }
+    }
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+#[serde(rename_all = "snake_case")]
+pub enum SkinSource {
+    /// A default Minecraft skin, which may be assigned to players at random by default.
+    Default,
+    /// A skin that is not the default, but is not a custom skin managed by our app either.
+    CustomExternal,
+    /// A custom skin we have set up in our app.
+    Custom,
+}
+
+/// Retrieves the available capes for the currently selected Minecraft profile. At most one cape
+/// can be equipped at a time. Also, at most one cape can be set as the default cape.
+#[tracing::instrument]
+pub async fn get_available_capes() -> crate::Result<Vec<Cape>> {
+    let state = State::get().await?;
+
+    let selected_credentials = Credentials::get_default_credential(&state.pool)
+        .await?
+        .ok_or(ErrorKind::NoCredentialsError)?;
+
+    let profile =
+        selected_credentials.online_profile().await.ok_or_else(|| {
+            ErrorKind::OnlineMinecraftProfileUnavailable {
+                user_name: selected_credentials.offline_profile.name.clone(),
+            }
+        })?;
+
+    let default_cape_id = DefaultMinecraftCape::get(profile.id, &state.pool)
+        .await?
+        .map(|cape| cape.id);
+
+    Ok(profile
+        .capes
+        .iter()
+        .map(|cape| Cape {
+            id: cape.id,
+            name: Arc::clone(&cape.name),
+            texture: Arc::clone(&cape.url),
+            is_default: default_cape_id
+                .is_some_and(|default_cape_id| default_cape_id == cape.id),
+            is_equipped: cape.state
+                == MinecraftCharacterExpressionState::Active,
+        })
+        .collect())
+}
+
+/// Retrieves the available skins for the currently selected Minecraft profile. At the moment,
+/// this includes custom skins stored in the app database, default Mojang skins, and the currently
+/// equipped skin, if different from the previous skins. Exactly one of the returned skins is
+/// marked as equipped.
+#[tracing::instrument]
+pub async fn get_available_skins() -> crate::Result<Vec<Skin>> {
+    let state = State::get().await?;
+
+    let selected_credentials = Credentials::get_default_credential(&state.pool)
+        .await?
+        .ok_or(ErrorKind::NoCredentialsError)?;
+
+    let profile =
+        selected_credentials.online_profile().await.ok_or_else(|| {
+            ErrorKind::OnlineMinecraftProfileUnavailable {
+                user_name: selected_credentials.offline_profile.name.clone(),
+            }
+        })?;
+
+    let current_skin = profile.current_skin()?;
+    let current_cape_id = profile.current_cape().map(|cape| cape.id);
+    let default_cape_id = DefaultMinecraftCape::get(profile.id, &state.pool)
+        .await?
+        .map(|cape| cape.id);
+
+    // Keep track of whether we have found the currently equipped skin, to potentially avoid marking
+    // several skins as equipped, and know if the equipped skin was found (see below)
+    let found_equipped_skin = Arc::new(AtomicBool::new(false));
+
+    let custom_skins = CustomMinecraftSkin::get_all(profile.id, &state.pool)
+        .await?
+        .then(|custom_skin| {
+            let found_equipped_skin = Arc::clone(&found_equipped_skin);
+            let state = Arc::clone(&state);
+            async move {
+                // Several custom skins may reuse the same texture for different cape or skin model
+                // variations, so check all attributes for correctness
+                let is_equipped = !found_equipped_skin.load(Ordering::Acquire)
+                    && custom_skin.texture_key == *current_skin.texture_key()
+                    && custom_skin.variant == current_skin.variant
+                    && custom_skin.cape_id
+                        == if custom_skin.cape_id.is_some() {
+                            current_cape_id
+                        } else {
+                            default_cape_id
+                        };
+
+                found_equipped_skin.fetch_or(is_equipped, Ordering::AcqRel);
+
+                Ok::<_, crate::Error>(Skin {
+                    name: None,
+                    variant: custom_skin.variant,
+                    cape_id: custom_skin.cape_id,
+                    texture: texture_blob_to_data_url(
+                        custom_skin.texture_blob(&state.pool).await?,
+                    ),
+                    source: SkinSource::Custom,
+                    is_equipped,
+                    texture_key: custom_skin.texture_key.into(),
+                })
+            }
+        });
+
+    let default_skins =
+        stream::iter(assets::DEFAULT_SKINS.iter().map(|default_skin| {
+            let is_equipped = !found_equipped_skin.load(Ordering::Acquire)
+                && default_skin.texture_key == current_skin.texture_key()
+                && default_skin.variant == current_skin.variant;
+
+            found_equipped_skin.fetch_or(is_equipped, Ordering::AcqRel);
+
+            Ok::<_, crate::Error>(Skin {
+                texture_key: Arc::clone(&default_skin.texture_key),
+                name: default_skin.name.as_ref().cloned(),
+                variant: default_skin.variant,
+                cape_id: None,
+                texture: Arc::clone(&default_skin.texture),
+                source: SkinSource::Default,
+                is_equipped,
+            })
+        }));
+
+    let mut available_skins = custom_skins
+        .chain(default_skins)
+        .try_collect::<Vec<_>>()
+        .await?;
+
+    // If the currently equipped skin does not match any of the skins we know about,
+    // add it to the list of available skins as a custom external skin, set by an
+    // external service (e.g., the Minecraft launcher or website). This way we guarantee
+    // that the currently equipped skin is always returned as available
+    if !found_equipped_skin.load(Ordering::Acquire) {
+        available_skins.push(Skin {
+            texture_key: current_skin.texture_key(),
+            name: current_skin.name.as_deref().map(Arc::from),
+            variant: current_skin.variant,
+            cape_id: current_cape_id,
+            texture: Arc::clone(&current_skin.url),
+            source: SkinSource::CustomExternal,
+            is_equipped: true,
+        });
+    }
+
+    Ok(available_skins)
+}
+
+/// Adds a custom skin to the app database and equips it for the currently selected
+/// Minecraft profile.
+#[tracing::instrument]
+pub async fn add_and_equip_custom_skin(
+    texture_blob: Bytes,
+    variant: MinecraftSkinVariant,
+    cape_override: Option<Cape>,
+) -> crate::Result<()> {
+    let (skin_width, skin_height) = png_dimensions(&texture_blob)?;
+    if skin_width != 64 || ![32, 64].contains(&skin_height) {
+        return Err(ErrorKind::InvalidSkinTexture)?;
+    }
+
+    let cape_override = cape_override.map(|cape| cape.id);
+    let state = State::get().await?;
+
+    let selected_credentials = Credentials::get_default_credential(&state.pool)
+        .await?
+        .ok_or(ErrorKind::NoCredentialsError)?;
+
+    // We have to equip the skin first, as it's the Mojang API backend who knows
+    // how to compute the texture key we require, which we can then read from the
+    // updated player profile
+    mojang_api::MinecraftSkinOperation::equip(
+        &selected_credentials,
+        stream::iter([Ok::<_, String>(Bytes::clone(&texture_blob))]),
+        variant,
+    )
+    .await?;
+
+    let profile =
+        selected_credentials.online_profile().await.ok_or_else(|| {
+            ErrorKind::OnlineMinecraftProfileUnavailable {
+                user_name: selected_credentials.offline_profile.name.clone(),
+            }
+        })?;
+
+    sync_cape(&state, &selected_credentials, &profile, cape_override).await?;
+
+    CustomMinecraftSkin::add(
+        profile.id,
+        &profile.current_skin()?.texture_key(),
+        &texture_blob,
+        variant,
+        cape_override,
+        &state.pool,
+    )
+    .await?;
+
+    Ok(())
+}
+
+/// Sets the default cape for the currently selected Minecraft profile. If `None`,
+/// the default cape will be removed.
+///
+/// This cape will be used by any custom skin that does not have a cape override
+/// set. If the currently equipped skin does not have a cape override set, the equipped
+/// cape will also be changed to the new default cape. When neither the equipped skin
+/// defines a cape override nor the default cape is set, the player will have no
+/// cape equipped.
+#[tracing::instrument]
+pub async fn set_default_cape(cape: Option<Cape>) -> crate::Result<()> {
+    let state = State::get().await?;
+
+    let selected_credentials = Credentials::get_default_credential(&state.pool)
+        .await?
+        .ok_or(ErrorKind::NoCredentialsError)?;
+
+    let profile =
+        selected_credentials.online_profile().await.ok_or_else(|| {
+            ErrorKind::OnlineMinecraftProfileUnavailable {
+                user_name: selected_credentials.offline_profile.name.clone(),
+            }
+        })?;
+    let current_skin = get_available_skins()
+        .await?
+        .into_iter()
+        .find(|skin| skin.is_equipped)
+        .unwrap();
+
+    if let Some(cape) = cape {
+        // Synchronize the equipped cape with the new default cape, if the current skin uses
+        // the default cape
+        if current_skin.cape_id.is_none() {
+            mojang_api::MinecraftCapeOperation::equip(
+                &selected_credentials,
+                cape.id,
+            )
+            .await?;
+        }
+
+        DefaultMinecraftCape::set(profile.id, cape.id, &state.pool).await?;
+    } else {
+        if current_skin.cape_id.is_none() {
+            mojang_api::MinecraftCapeOperation::unequip_any(
+                &selected_credentials,
+            )
+            .await?;
+        }
+
+        DefaultMinecraftCape::remove(profile.id, &state.pool).await?;
+    }
+
+    Ok(())
+}
+
+/// Equips the given skin for the currently selected Minecraft profile. If the skin is already
+/// equipped, it will be re-equipped.
+///
+/// This function does not check that the passed skin, if custom, exists in the app database,
+/// giving the caller complete freedom to equip any skin at any time.
+#[tracing::instrument]
+pub async fn equip_skin(skin: Skin) -> crate::Result<()> {
+    let state = State::get().await?;
+
+    let selected_credentials = Credentials::get_default_credential(&state.pool)
+        .await?
+        .ok_or(ErrorKind::NoCredentialsError)?;
+
+    let profile =
+        selected_credentials.online_profile().await.ok_or_else(|| {
+            ErrorKind::OnlineMinecraftProfileUnavailable {
+                user_name: selected_credentials.offline_profile.name.clone(),
+            }
+        })?;
+
+    mojang_api::MinecraftSkinOperation::equip(
+        &selected_credentials,
+        skin.resolve_texture().await?,
+        skin.variant,
+    )
+    .await?;
+
+    sync_cape(&state, &selected_credentials, &profile, skin.cape_id).await?;
+
+    Ok(())
+}
+
+/// Removes a custom skin from the app database.
+///
+/// The player will continue to be equipped with the same skin and cape as before, even if
+/// the currently selected skin is the one being removed. This gives frontend code more options
+/// to decide between unequipping strategies: falling back to other custom skin, to a default
+/// skin, letting the user choose another skin, etc.
+#[tracing::instrument]
+pub async fn remove_custom_skin(skin: Skin) -> crate::Result<()> {
+    let state = State::get().await?;
+
+    let selected_credentials = Credentials::get_default_credential(&state.pool)
+        .await?
+        .ok_or(ErrorKind::NoCredentialsError)?;
+
+    CustomMinecraftSkin {
+        texture_key: skin.texture_key.to_string(),
+        variant: skin.variant,
+        cape_id: skin.cape_id,
+    }
+    .remove(
+        selected_credentials.maybe_online_profile().await.id,
+        &state.pool,
+    )
+    .await?;
+
+    Ok(())
+}
+
+/// Unequips the currently equipped skin for the currently selected Minecraft profile, resetting
+/// it to one of the default skins. The cape will be set to the default cape, or unequipped if
+/// no default cape is set.
+#[tracing::instrument]
+pub async fn unequip_skin() -> crate::Result<()> {
+    let state = State::get().await?;
+
+    let selected_credentials = Credentials::get_default_credential(&state.pool)
+        .await?
+        .ok_or(ErrorKind::NoCredentialsError)?;
+
+    let profile =
+        selected_credentials.online_profile().await.ok_or_else(|| {
+            ErrorKind::OnlineMinecraftProfileUnavailable {
+                user_name: selected_credentials.offline_profile.name.clone(),
+            }
+        })?;
+
+    mojang_api::MinecraftSkinOperation::unequip_any(&selected_credentials)
+        .await?;
+
+    sync_cape(&state, &selected_credentials, &profile, None).await?;
+
+    Ok(())
+}
+
+/// Synchronizes the equipped cape with the selected cape if necessary, taking into
+/// account the currently equipped cape, the default cape for the player, and if a
+/// cape override is provided.
+async fn sync_cape(
+    state: &State,
+    selected_credentials: &Credentials,
+    profile: &MinecraftProfile,
+    cape_override: Option<Uuid>,
+) -> crate::Result<()> {
+    let current_cape_id = profile.current_cape().map(|cape| cape.id);
+    let target_cape_id = match cape_override {
+        Some(cape_id) => Some(cape_id),
+        None => DefaultMinecraftCape::get(profile.id, &state.pool)
+            .await?
+            .map(|cape| cape.id),
+    };
+
+    if current_cape_id != target_cape_id {
+        match target_cape_id {
+            Some(cape_id) => {
+                mojang_api::MinecraftCapeOperation::equip(
+                    selected_credentials,
+                    cape_id,
+                )
+                .await?
+            }
+            None => {
+                mojang_api::MinecraftCapeOperation::unequip_any(
+                    selected_credentials,
+                )
+                .await?
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn texture_blob_to_data_url(texture_blob: Vec<u8>) -> Arc<Url> {
+    let data = if is_png(&texture_blob) {
+        Cow::Owned(texture_blob)
+    } else {
+        // Fall back to a placeholder texture if the DB somehow contains corrupt data
+        Cow::Borrowed(
+            &include_bytes!("minecraft_skins/assets/default/MissingNo.png")[..],
+        )
+    };
+
+    Url::parse(&format!(
+        "data:image/png;base64,{}",
+        base64::engine::general_purpose::STANDARD.encode(data)
+    ))
+    .unwrap()
+    .into()
+}
+
+fn is_png(data: &[u8]) -> bool {
+    /// The initial 8 bytes of a PNG file, used to identify it as such.
+    ///
+    /// Reference: <https://www.w3.org/TR/png-3/#3PNGsignature>
+    const PNG_SIGNATURE: &[u8] =
+        &[0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
+
+    data.starts_with(PNG_SIGNATURE)
+}
+
+fn png_dimensions(data: &[u8]) -> crate::Result<(u32, u32)> {
+    if !is_png(data) {
+        Err(ErrorKind::InvalidPng)?;
+    }
+
+    // Read the width and height fields from the IHDR chunk, which the
+    // PNG specification mandates to be the first in the file, just after
+    // the 8 signature bytes. See:
+    // https://www.w3.org/TR/png-3/#5DataRep
+    // https://www.w3.org/TR/png-3/#11IHDR
+    let width = u32::from_be_bytes(
+        data.get(16..20)
+            .ok_or(ErrorKind::InvalidPng)?
+            .try_into()
+            .unwrap(),
+    );
+    let height = u32::from_be_bytes(
+        data.get(20..24)
+            .ok_or(ErrorKind::InvalidPng)?
+            .try_into()
+            .unwrap(),
+    );
+
+    Ok((width, height))
+}
--- a/packages/app-lib/src/api/minecraft_skins/assets/default/MissingNo.png
+++ b/packages/app-lib/src/api/minecraft_skins/assets/default/MissingNo.png
--- a/packages/app-lib/src/api/minecraft_skins/assets/default/default_skins.rs
+++ b/packages/app-lib/src/api/minecraft_skins/assets/default/default_skins.rs
@ -0,0 +1,213 @@
+use std::sync::{Arc, LazyLock};
+
+use url::Url;
+
+use crate::{minecraft_skins::SkinSource, state::MinecraftSkinVariant};
+
+use super::super::super::Skin;
+
+/// A list of default Minecraft skins to make available to the user.
+///
+/// These skins were created by Mojang, and found by reverse engineering the
+/// behavior of the Minecraft launcher. The textures are publicly available at
+/// `https://textures.minecraft.net/texture/<texture_key>`.
+pub static DEFAULT_SKINS: LazyLock<Vec<Skin>> = LazyLock::new(|| {
+    vec![Skin {
+        texture_key: Arc::from("46acd06e8483b176e8ea39fc12fe105eb3a2a4970f5100057e9d84d4b60bdfa7"),
+        name: Some(Arc::from("Alex")),
+        variant: MinecraftSkinVariant::Slim,
+        cape_id: None,
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+        cape_id: None,
+        texture: Arc::from(Url::try_from(
+            "data:image/png;base64,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"
+        ).unwrap()),
+        source: SkinSource::Default,
+        is_equipped: false,
+    },
+    Skin {
+        texture_key: Arc::from("a3bd16079f764cd541e072e888fe43885e711f98658323db0f9a6045da91ee7a"),
+        name: Some(Arc::from("Sunny")),
+        variant: MinecraftSkinVariant::Classic,
+        cape_id: None,
+        texture: Arc::from(Url::try_from(
+            "data:image/png;base64,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"
+        ).unwrap()),
+        source: SkinSource::Default,
+        is_equipped: false,
+    },
+    Skin {
+        texture_key: Arc::from("eee522611005acf256dbd152e992c60c0bb7978cb0f3127807700e478ad97664"),
+        name: Some(Arc::from("Zuri")),
+        variant: MinecraftSkinVariant::Slim,
+        cape_id: None,
+        texture: Arc::from(Url::try_from(
+            "data:image/png;base64,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"
+        ).unwrap()),
+        source: SkinSource::Default,
+        is_equipped: false,
+    },
+    Skin {
+        texture_key: Arc::from("f5dddb41dcafef616e959c2817808e0be741c89ffbfed39134a13e75b811863d"),
+        name: Some(Arc::from("Zuri")),
+        variant: MinecraftSkinVariant::Classic,
+        cape_id: None,
+        texture: Arc::from(Url::try_from(
+            "data:image/png;base64,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"
+        ).unwrap()),
+        source: SkinSource::Default,
+        is_equipped: false,
+    }]
+});
--- a/packages/app-lib/src/api/mod.rs
+++ b/packages/app-lib/src/api/mod.rs
@ -6,6 +6,7 @@ pub mod jre;
 pub mod logs;
 pub mod metadata;
 pub mod minecraft_auth;
+pub mod minecraft_skins;
 pub mod mr_auth;
 pub mod pack;
 pub mod process;
--- a/packages/app-lib/src/api/profile/mod.rs
+++ b/packages/app-lib/src/api/profile/mod.rs
@ -642,9 +642,8 @@ pub async fn run(
 }

 /// Run Minecraft using a profile, and credentials for authentication
-/// Returns Arc pointer to RwLock to Child
 #[tracing::instrument(skip(credentials))]
-pub async fn run_credentials(
+async fn run_credentials(
    path: &str,
    credentials: &Credentials,
    quick_play_type: &QuickPlayType,
--- a/packages/app-lib/src/error.rs
+++ b/packages/app-lib/src/error.rs
@ -1,5 +1,8 @@
 //! Theseus error type
+use std::sync::Arc;
+
 use crate::{profile, util};
+use data_url::DataUrlError;
 use tracing_error::InstrumentError;

 #[derive(thiserror::Error, Debug)]
@ -125,12 +128,29 @@ pub enum ErrorKind {

    #[error("Error resolving DNS: {0}")]
    DNSError(#[from] hickory_resolver::ResolveError),
+
+    #[error("An online profile for {user_name} is not available")]
+    OnlineMinecraftProfileUnavailable { user_name: String },
+
+    #[error("Invalid data URL: {0}")]
+    InvalidDataUrl(#[from] DataUrlError),
+
+    #[error("Invalid data URL: {0}")]
+    InvalidDataUrlBase64(#[from] data_url::forgiving_base64::InvalidBase64),
+
+    #[error("Invalid PNG")]
+    InvalidPng,
+
+    #[error(
+        "A skin texture must have a dimension of either 64x64 or 64x32 pixels"
+    )]
+    InvalidSkinTexture,
 }

 #[derive(Debug)]
 pub struct Error {
-    pub raw: std::sync::Arc<ErrorKind>,
-    pub source: tracing_error::TracedError<std::sync::Arc<ErrorKind>>,
+    pub raw: Arc<ErrorKind>,
+    pub source: tracing_error::TracedError<Arc<ErrorKind>>,
 }

 impl std::error::Error for Error {
@ -148,7 +168,7 @@ impl std::fmt::Display for Error {
 impl<E: Into<ErrorKind>> From<E> for Error {
    fn from(source: E) -> Self {
        let error = Into::<ErrorKind>::into(source);
-        let boxed_error = std::sync::Arc::new(error);
+        let boxed_error = Arc::new(error);

        Self {
            raw: boxed_error.clone(),
--- a/packages/app-lib/src/launcher/args.rs
+++ b/packages/app-lib/src/launcher/args.rs
@ -211,7 +211,7 @@ fn parse_jvm_argument(
 }

 #[allow(clippy::too_many_arguments)]
-pub fn get_minecraft_arguments(
+pub async fn get_minecraft_arguments(
    arguments: Option<&[Argument]>,
    legacy_arguments: Option<&str>,
    credentials: &Credentials,
@ -224,6 +224,9 @@ pub fn get_minecraft_arguments(
    java_arch: &str,
    quick_play_type: &QuickPlayType,
 ) -> crate::Result<Vec<String>> {
+    let access_token = credentials.access_token.clone();
+    let profile = credentials.maybe_online_profile().await;
+
    if let Some(arguments) = arguments {
        let mut parsed_arguments = Vec::new();

@ -233,9 +236,9 @@ pub fn get_minecraft_arguments(
            |arg| {
                parse_minecraft_argument(
                    arg,
-                    &credentials.access_token,
-                    &credentials.username,
-                    credentials.id,
+                    &access_token,
+                    &profile.name,
+                    profile.id,
                    version,
                    asset_index_name,
                    game_directory,
@ -255,9 +258,9 @@ pub fn get_minecraft_arguments(
        for x in legacy_arguments.split(' ') {
            parsed_arguments.push(parse_minecraft_argument(
                &x.replace(' ', TEMPORARY_REPLACE_CHAR),
-                &credentials.access_token,
-                &credentials.username,
-                credentials.id,
+                &access_token,
+                &profile.name,
+                profile.id,
                version,
                asset_index_name,
                game_directory,
--- a/packages/app-lib/src/launcher/mod.rs
+++ b/packages/app-lib/src/launcher/mod.rs
@ -645,7 +645,8 @@ pub async fn launch_minecraft(
                *resolution,
                &java_version.architecture,
                quick_play_type,
-            )?
+            )
+            .await?
            .into_iter(),
        )
        .current_dir(instance_path.clone());
@ -655,7 +656,7 @@ pub async fn launch_minecraft(
    if std::env::var("CARGO").is_ok() {
        command.env_remove("DYLD_FALLBACK_LIBRARY_PATH");
    }
-    // Java options should be set in instance options (the existence of _JAVA_OPTIONS overwites them)
+    // Java options should be set in instance options (the existence of _JAVA_OPTIONS overwrites them)
    command.env_remove("_JAVA_OPTIONS");

    command.envs(env_args);
--- a/packages/app-lib/src/state/legacy_converter.rs
+++ b/packages/app-lib/src/state/legacy_converter.rs
@ -19,6 +19,8 @@ use std::path::PathBuf;
 use tokio::sync::Semaphore;
 use uuid::Uuid;

+use super::MinecraftProfile;
+
 pub async fn migrate_legacy_data<'a, E>(exec: E) -> crate::Result<()>
 where
    E: sqlx::Executor<'a, Database = sqlx::Sqlite> + Copy,
@ -117,13 +119,16 @@ where
        .await
        {
            let minecraft_users_len = minecraft_auth.users.len();
-            for (uuid, credential) in minecraft_auth.users {
+            for (uuid, legacy_credentials) in minecraft_auth.users {
                Credentials {
-                    id: credential.id,
-                    username: credential.username,
-                    access_token: credential.access_token,
-                    refresh_token: credential.refresh_token,
-                    expires: credential.expires,
+                    offline_profile: MinecraftProfile {
+                        id: legacy_credentials.id,
+                        name: legacy_credentials.username,
+                        ..MinecraftProfile::default()
+                    },
+                    access_token: legacy_credentials.access_token,
+                    refresh_token: legacy_credentials.refresh_token,
+                    expires: legacy_credentials.expires,
                    active: minecraft_auth.default_user == Some(uuid)
                        || minecraft_users_len == 1,
                }
--- a/packages/app-lib/src/state/minecraft_auth.rs
+++ b/packages/app-lib/src/state/minecraft_auth.rs
@ -5,25 +5,38 @@ use base64::prelude::{BASE64_STANDARD, BASE64_URL_SAFE_NO_PAD};
 use chrono::{DateTime, Duration, TimeZone, Utc};
 use dashmap::DashMap;
 use futures::TryStreamExt;
+use heck::ToTitleCase;
 use p256::ecdsa::signature::Signer;
 use p256::ecdsa::{Signature, SigningKey, VerifyingKey};
 use p256::pkcs8::{DecodePrivateKey, EncodePrivateKey, LineEnding};
 use rand::Rng;
 use rand::rngs::OsRng;
-use reqwest::Response;
 use reqwest::header::HeaderMap;
+use reqwest::{Response, StatusCode};
 use serde::de::DeserializeOwned;
-use serde::{Deserialize, Serialize};
+use serde::ser::SerializeStruct;
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use serde_json::json;
 use sha2::Digest;
+use std::borrow::Cow;
 use std::collections::HashMap;
+use std::collections::hash_map::Entry;
 use std::future::Future;
+use std::hash::{BuildHasherDefault, DefaultHasher};
+use std::io;
+use std::ops::Deref;
+use std::sync::Arc;
+use std::time::Instant;
+use tokio::runtime::{Handle, RuntimeFlavor};
+use tokio::sync::Mutex;
+use tokio::task;
+use url::Url;
 use uuid::Uuid;

 #[derive(Debug, Clone, Copy)]
 pub enum MinecraftAuthStep {
    GetDeviceToken,
-    SisuAuthenicate,
+    SisuAuthenticate,
    GetOAuthToken,
    RefreshOAuthToken,
    SisuAuthorize,
@ -53,7 +66,7 @@ pub enum MinecraftAuthenticationError {
        raw: String,
        #[source]
        source: serde_json::Error,
-        status_code: reqwest::StatusCode,
+        status_code: StatusCode,
    },
    #[error("Request failed during step {step:?}: {source}")]
    Request {
@ -172,36 +185,87 @@ pub async fn login_finish(
    minecraft_entitlements(&minecraft_token.access_token).await?;

    let mut credentials = Credentials {
-        id: Uuid::default(),
-        username: String::default(),
+        offline_profile: MinecraftProfile::default(),
        access_token: minecraft_token.access_token,
        refresh_token: oauth_token.value.refresh_token,
        expires: oauth_token.date
            + Duration::seconds(oauth_token.value.expires_in as i64),
        active: true,
    };
-    credentials.get_profile().await?;
+
+    // During login, we need to fetch the online profile at least once to get the
+    // player UUID and name to use for the offline profile, in order for that offline
+    // profile to make sense. It's also important to modify the returned credentials
+    // object, as otherwise continued usage of it will skip the profile cache due to
+    // the dummy UUID
+    let online_profile = credentials
+        .online_profile()
+        .await
+        .ok_or(io::Error::other("Failed to fetch player profile"))?;
+    credentials.offline_profile = MinecraftProfile {
+        id: online_profile.id,
+        name: online_profile.name.clone(),
+        ..credentials.offline_profile
+    };

    credentials.upsert(exec).await?;

    Ok(credentials)
 }

-#[derive(Serialize, Deserialize, Clone, Debug)]
+#[derive(Deserialize, Debug)]
 pub struct Credentials {
-    pub id: Uuid,
-    pub username: String,
+    /// The offline profile of the user these credentials are for.
+    ///
+    /// Such a profile can only be relied upon to have a proper player UUID, which is
+    /// never changed. A potentially stale username may be available, but no other data
+    /// such as skins or capes is available.
+    #[serde(rename = "profile")]
+    pub offline_profile: MinecraftProfile,
    pub access_token: String,
    pub refresh_token: String,
    pub expires: DateTime<Utc>,
    pub active: bool,
 }

+/// An entry in the player profile cache, keyed by player UUID.
+pub(super) enum ProfileCacheEntry {
+    /// A cached profile that is valid, even though it may be stale.
+    Hit(Arc<MinecraftProfile>),
+    /// A negative profile fetch result due to an authentication error,
+    /// from which we're recovering by holding off from repeatedly
+    /// attempting to fetch the profile until the token is refreshed
+    /// or some time has passed.
+    AuthErrorBackoff {
+        likely_expired_token: String,
+        last_attempt: Instant,
+    },
+}
+
+/// A thread-safe cache of online profiles, used to avoid fetching the
+/// same profile multiple times as long as they don't get too stale.
+///
+/// The cache has to be static because credential objects are short lived
+/// and disposable, and in the future several threads may be interested in
+/// profile data.
+pub(super) static PROFILE_CACHE: Mutex<
+    HashMap<Uuid, ProfileCacheEntry, BuildHasherDefault<DefaultHasher>>,
+> = Mutex::const_new(HashMap::with_hasher(BuildHasherDefault::new()));
+
 impl Credentials {
+    /// Refreshes the authentication tokens for this user if they are expired, or
+    /// very close to expiration.
    async fn refresh(
        &mut self,
        exec: impl sqlx::Executor<'_, Database = sqlx::Sqlite> + Copy,
    ) -> crate::Result<()> {
+        // Use a margin of 5 minutes to give e.g. Minecraft and potentially
+        // other operations that depend on a fresh token 5 minutes to complete
+        // from now, and deal with some classes of clock skew
+        if self.expires > Utc::now() + Duration::minutes(5) {
+            return Ok(());
+        }
+
        let oauth_token = oauth_refresh(&self.refresh_token).await?;
        let (pair, current_date, _) =
            DeviceTokenPair::refresh_and_get_device_token(
@ -235,22 +299,118 @@ impl Credentials {
        self.expires = oauth_token.date
            + Duration::seconds(oauth_token.value.expires_in as i64);

-        self.get_profile().await?;
-
        self.upsert(exec).await?;

        Ok(())
    }

-    async fn get_profile(&mut self) -> crate::Result<()> {
-        let profile = minecraft_profile(&self.access_token).await?;
+    #[tracing::instrument(skip(self))]
+    pub async fn online_profile(&self) -> Option<Arc<MinecraftProfile>> {
+        let mut profile_cache = PROFILE_CACHE.lock().await;

-        self.id = profile.id.unwrap_or_default();
-        self.username = profile.name;
+        loop {
+            match profile_cache.entry(self.offline_profile.id) {
+                Entry::Occupied(entry) => {
+                    match entry.get() {
+                        ProfileCacheEntry::Hit(profile)
+                            if profile.is_fresh() =>
+                        {
+                            return Some(Arc::clone(profile));
+                        }
+                        ProfileCacheEntry::Hit(_) => {
+                            // The profile is stale, so remove it and try again
+                            entry.remove();
+                            continue;
+                        }
+                        // Auth errors must be handled with a backoff strategy because it
+                        // has been experimentally found that Mojang quickly rate limits
+                        // the profile data endpoint on repeated attempts with bad auth
+                        ProfileCacheEntry::AuthErrorBackoff {
+                            likely_expired_token,
+                            last_attempt,
+                        } if &self.access_token != likely_expired_token
+                            || Instant::now()
+                                .saturating_duration_since(*last_attempt)
+                                > std::time::Duration::from_secs(60) =>
+                        {
+                            entry.remove();
+                            continue;
+                        }
+                        ProfileCacheEntry::AuthErrorBackoff { .. } => {
+                            return None;
+                        }
+                    }
+                }
+                Entry::Vacant(entry) => {
+                    match minecraft_profile(&self.access_token).await {
+                        Ok(profile) => {
+                            let profile = Arc::new(profile);
+                            let cache_entry =
+                                ProfileCacheEntry::Hit(Arc::clone(&profile));

-        Ok(())
+                            // When fetching a profile for the first time, the player UUID may
+                            // be unknown (i.e., set to a dummy value), so make sure we don't
+                            // cache it in the wrong place
+                            if entry.key() != &profile.id {
+                                profile_cache.insert(profile.id, cache_entry);
+                            } else {
+                                entry.insert(cache_entry);
+                            }
+
+                            return Some(profile);
+                        }
+                        Err(
+                            err @ MinecraftAuthenticationError::DeserializeResponse {
+                                status_code: StatusCode::UNAUTHORIZED,
+                                ..
+                            },
+                        ) => {
+                            tracing::warn!(
+                                "Failed to fetch online profile for UUID {} likely due to stale credentials, backing off: {err}",
+                                self.offline_profile.id
+                            );
+
+                            // We have to assume the player UUID key we have is correct here, which
+                            // should always be the case assuming a non-adversarial server. In any
+                            // case, any cache poisoning is inconsequential due to the entry expiration
+                            // and the fact that we use at most one single dummy UUID
+                            entry.insert(ProfileCacheEntry::AuthErrorBackoff {
+                                likely_expired_token: self.access_token.clone(),
+                                last_attempt: Instant::now(),
+                            });
+
+                            return None;
+                        }
+                        Err(err) => {
+                            tracing::warn!(
+                                "Failed to fetch online profile for UUID {}: {err}",
+                                self.offline_profile.id
+                            );
+
+                            return None;
+                        }
+                    }
+                }
+            }
+        }
    }

+    /// Attempts to fetch the online profile for this user if possible, and if that fails
+    /// falls back to the known offline profile data.
+    ///
+    /// See also the [`online_profile`](Self::online_profile) method.
+    pub async fn maybe_online_profile(
+        &self,
+    ) -> MaybeOnlineMinecraftProfile<'_> {
+        let online_profile = self.online_profile().await;
+        online_profile.map_or_else(
+            || MaybeOnlineMinecraftProfile::Offline(&self.offline_profile),
+            MaybeOnlineMinecraftProfile::Online,
+        )
+    }
+
+    /// Like [`get_active`](Self::get_active), but enforces credentials to be
+    /// successfully refreshed unless the network is unreachable or times out.
    #[tracing::instrument]
    pub async fn get_default_credential(
        exec: impl sqlx::Executor<'_, Database = sqlx::Sqlite> + Copy,
@ -258,37 +418,35 @@ impl Credentials {
        let credentials = Self::get_active(exec).await?;

        if let Some(mut creds) = credentials {
-            if creds.expires < Utc::now() {
-                let res = creds.refresh(exec).await;
+            let res = creds.refresh(exec).await;

-                match res {
-                    Ok(_) => Ok(Some(creds)),
-                    Err(err) => {
-                        if let ErrorKind::MinecraftAuthenticationError(
-                            MinecraftAuthenticationError::Request {
-                                ref source,
-                                ..
-                            },
-                        ) = *err.raw
-                        {
-                            if source.is_connect() || source.is_timeout() {
-                                return Ok(Some(creds));
-                            }
+            match res {
+                Ok(_) => Ok(Some(creds)),
+                Err(err) => {
+                    if let ErrorKind::MinecraftAuthenticationError(
+                        MinecraftAuthenticationError::Request {
+                            ref source,
+                            ..
+                        },
+                    ) = *err.raw
+                    {
+                        if source.is_connect() || source.is_timeout() {
+                            return Ok(Some(creds));
                        }
-
-                        Err(err)
                    }
+
+                    Err(err)
                }
-            } else {
-                Ok(Some(creds))
            }
        } else {
            Ok(None)
        }
    }

+    /// Fetches the currently selected credentials from the database, attempting
+    /// to refresh them if they are expired.
    pub async fn get_active(
-        exec: impl sqlx::Executor<'_, Database = sqlx::Sqlite>,
+        exec: impl sqlx::Executor<'_, Database = sqlx::Sqlite> + Copy,
    ) -> crate::Result<Option<Self>> {
        let res = sqlx::query!(
            "
@ -301,21 +459,31 @@ impl Credentials {
        .fetch_optional(exec)
        .await?;

-        Ok(res.map(|x| Self {
-            id: Uuid::parse_str(&x.uuid).unwrap_or_default(),
-            username: x.username,
-            access_token: x.access_token,
-            refresh_token: x.refresh_token,
-            expires: Utc
-                .timestamp_opt(x.expires, 0)
-                .single()
-                .unwrap_or_else(Utc::now),
-            active: x.active == 1,
-        }))
+        Ok(match res {
+            Some(x) => {
+                let mut credentials = Self {
+                    offline_profile: MinecraftProfile {
+                        id: Uuid::parse_str(&x.uuid).unwrap_or_default(),
+                        name: x.username,
+                        ..MinecraftProfile::default()
+                    },
+                    access_token: x.access_token,
+                    refresh_token: x.refresh_token,
+                    expires: Utc
+                        .timestamp_opt(x.expires, 0)
+                        .single()
+                        .unwrap_or_else(Utc::now),
+                    active: x.active == 1,
+                };
+                credentials.refresh(exec).await.ok();
+                Some(credentials)
+            }
+            None => None,
+        })
    }

    pub async fn get_all(
-        exec: impl sqlx::Executor<'_, Database = sqlx::Sqlite>,
+        exec: impl sqlx::Executor<'_, Database = sqlx::Sqlite> + Copy,
    ) -> crate::Result<DashMap<Uuid, Self>> {
        let res = sqlx::query!(
            "
@ -327,23 +495,27 @@ impl Credentials {
        .fetch(exec)
        .try_fold(DashMap::new(), |acc, x| {
            let uuid = Uuid::parse_str(&x.uuid).unwrap_or_default();
-
-            acc.insert(
-                uuid,
-                Self {
+            let mut credentials = Self {
+                offline_profile: MinecraftProfile {
                    id: uuid,
-                    username: x.username,
-                    access_token: x.access_token,
-                    refresh_token: x.refresh_token,
-                    expires: Utc
-                        .timestamp_opt(x.expires, 0)
-                        .single()
-                        .unwrap_or_else(Utc::now),
-                    active: x.active == 1,
+                    name: x.username,
+                    ..MinecraftProfile::default()
                },
-            );
+                access_token: x.access_token,
+                refresh_token: x.refresh_token,
+                expires: Utc
+                    .timestamp_opt(x.expires, 0)
+                    .single()
+                    .unwrap_or_else(Utc::now),
+                active: x.active == 1,
+            };

-            async move { Ok(acc) }
+            async move {
+                credentials.refresh(exec).await.ok();
+                acc.insert(uuid, credentials);
+
+                Ok(acc)
+            }
        })
        .await?;

@ -354,8 +526,9 @@ impl Credentials {
        &self,
        exec: impl sqlx::Executor<'_, Database = sqlx::Sqlite> + Copy,
    ) -> crate::Result<()> {
+        let profile = self.maybe_online_profile().await;
        let expires = self.expires.timestamp();
-        let uuid = self.id.as_hyphenated().to_string();
+        let uuid = profile.id.as_hyphenated().to_string();

        if self.active {
            sqlx::query!(
@ -381,7 +554,7 @@ impl Credentials {
            ",
            uuid,
            self.active,
-            self.username,
+            profile.name,
            self.access_token,
            self.refresh_token,
            expires,
@ -411,6 +584,46 @@ impl Credentials {
    }
 }

+impl Serialize for Credentials {
+    fn serialize<S: Serializer>(
+        &self,
+        serializer: S,
+    ) -> Result<S::Ok, S::Error> {
+        // Opportunistically hydrate the profile with its online data if possible for frontend
+        // consumption, transparently handling all the possible Tokio runtime states the current
+        // thread may be in the most efficient way
+        let profile = match Handle::try_current().ok() {
+            Some(runtime)
+                if runtime.runtime_flavor() == RuntimeFlavor::CurrentThread =>
+            {
+                runtime.block_on(self.maybe_online_profile())
+            }
+            Some(runtime) => task::block_in_place(|| {
+                runtime.block_on(self.maybe_online_profile())
+            }),
+            None => tokio::runtime::Builder::new_current_thread()
+                .enable_all()
+                .build()
+                .map_or_else(
+                    |_| {
+                        MaybeOnlineMinecraftProfile::Offline(
+                            &self.offline_profile,
+                        )
+                    },
+                    |runtime| runtime.block_on(self.maybe_online_profile()),
+                ),
+        };
+
+        let mut ser = serializer.serialize_struct("Credentials", 5)?;
+        ser.serialize_field("profile", &*profile)?;
+        ser.serialize_field("access_token", &self.access_token)?;
+        ser.serialize_field("refresh_token", &self.refresh_token)?;
+        ser.serialize_field("expires", &self.expires)?;
+        ser.serialize_field("active", &self.active)?;
+        ser.end()
+    }
+}
+
 pub struct DeviceTokenPair {
    pub token: DeviceToken,
    pub key: DeviceTokenKey,
@ -639,7 +852,7 @@ async fn sisu_authenticate(
          "TitleId": "1794566092",
        }),
        key,
-        MinecraftAuthStep::SisuAuthenicate,
+        MinecraftAuthStep::SisuAuthenticate,
        current_date,
    )
    .await?;
@ -911,13 +1124,197 @@ async fn minecraft_token(
    })
 }

-#[derive(Deserialize)]
-struct MinecraftProfile {
-    pub id: Option<Uuid>,
-    pub name: String,
+#[derive(
+    sqlx::Type, Deserialize, Serialize, Debug, Copy, Clone, PartialEq, Eq,
+)]
+#[serde(rename_all = "UPPERCASE")]
+#[sqlx(rename_all = "UPPERCASE")]
+pub enum MinecraftSkinVariant {
+    /// The classic player model, with arms that are 4 pixels wide.
+    Classic,
+    /// The slim player model, with arms that are 3 pixels wide.
+    Slim,
+    /// The player model is unknown.
+    #[serde(other)]
+    Unknown, // Defensive handling of unexpected Mojang API return values to
+             // prevent breaking the entire profile parsing
 }

-#[tracing::instrument]
+#[derive(Deserialize, Serialize, Debug, Copy, Clone, PartialEq, Eq)]
+#[serde(rename_all = "UPPERCASE")]
+pub enum MinecraftCharacterExpressionState {
+    /// This expression is selected for being displayed ingame.
+    ///
+    /// At the moment, at most one expression can be selected at a time.
+    Active,
+    /// This expression is not selected for being displayed ingame.
+    Inactive,
+    /// The expression selection status is unknown.
+    #[serde(other)]
+    Unknown, // Defensive handling of unexpected Mojang API return values to
+             // prevent breaking the entire profile parsing
+}
+
+#[derive(Deserialize, Serialize, Debug, Clone)]
+pub struct MinecraftSkin {
+    /// The UUID of this skin object.
+    ///
+    /// As of 2025-04-08, in the production Mojang profile endpoint this UUID
+    /// changes every time the player changes their skin, even if the skin
+    /// texture is the same as before.
+    pub id: Uuid,
+    /// The selection state of the skin.
+    ///
+    /// As of 2025-04-08, in the production Mojang profile endpoint this
+    /// is always `ACTIVE`, as only a single skin representing the current
+    /// skin is returned.
+    pub state: MinecraftCharacterExpressionState,
+    /// The URL to the skin texture.
+    ///
+    /// As of 2025-04-08, in the production Mojang profile endpoint the file
+    /// name for this URL is a hash of the skin texture, so that different
+    /// players using the same skin texture will share a texture URL.
+    pub url: Arc<Url>,
+    /// A hash of the skin texture.
+    ///
+    /// As of 2025-04-08, in the production Mojang profile endpoint this
+    /// is always set and the same as the file name of the skin texture URL.
+    #[serde(
+        default, // Defensive handling of unexpected Mojang API return values to
+                 // prevent breaking the entire profile parsing
+        rename = "textureKey"
+    )]
+    pub texture_key: Option<Arc<str>>,
+    /// The player model variant this skin is for.
+    pub variant: MinecraftSkinVariant,
+    /// User-friendly name for the skin.
+    ///
+    /// As of 2025-04-08, in the production Mojang profile endpoint this is
+    /// only set if the player has not set a custom skin, and this skin object
+    /// is therefore the default skin for the player's UUID.
+    #[serde(
+        default,
+        rename = "alias",
+        deserialize_with = "normalize_skin_alias_case"
+    )]
+    pub name: Option<String>,
+}
+
+impl MinecraftSkin {
+    /// Robustly computes the texture key for this skin, falling back to its
+    /// URL file name and finally to the skin UUID when necessary.
+    pub fn texture_key(&self) -> Arc<str> {
+        self.texture_key.as_ref().cloned().unwrap_or_else(|| {
+            self.url
+                .path_segments()
+                .and_then(|mut path_segments| {
+                    path_segments.next_back().map(String::from)
+                })
+                .unwrap_or_else(|| self.id.as_simple().to_string())
+                .into()
+        })
+    }
+}
+
+fn normalize_skin_alias_case<'de, D: Deserializer<'de>>(
+    deserializer: D,
+) -> Result<Option<String>, D::Error> {
+    // Skin aliases have been spotted to be returned in all caps, so make sure
+    // they are normalized to a prettier title case
+    Ok(<Option<Cow<'_, str>>>::deserialize(deserializer)?
+        .map(|alias| alias.to_title_case()))
+}
+
+#[derive(Deserialize, Serialize, Debug, Clone)]
+pub struct MinecraftCape {
+    /// The UUID of the cape.
+    pub id: Uuid,
+    /// The selection state of the cape.
+    pub state: MinecraftCharacterExpressionState,
+    /// The URL to the cape texture.
+    pub url: Arc<Url>,
+    /// The user-friendly name for the cape.
+    #[serde(rename = "alias")]
+    pub name: Arc<str>,
+}
+
+#[derive(Deserialize, Serialize, Debug, Default, Clone)]
+pub struct MinecraftProfile {
+    /// The UUID of the player.
+    #[serde(default)]
+    pub id: Uuid,
+    /// The username of the player.
+    pub name: String,
+    /// The skins the player is known to have.
+    ///
+    /// As of 2025-04-08, in the production Mojang profile endpoint every
+    /// player has a single skin.
+    pub skins: Vec<MinecraftSkin>,
+    /// The capes the player is known to have.
+    pub capes: Vec<MinecraftCape>,
+    /// The instant when the profile was fetched. See also [Self::is_fresh].
+    #[serde(skip)]
+    pub fetch_time: Option<Instant>,
+}
+
+impl MinecraftProfile {
+    /// Checks whether the profile data is fresh (i.e., highly likely to be
+    /// up-to-date because it was fetched recently) or stale. If it is not
+    /// known when this profile data has been fetched from Mojang servers (i.e.,
+    /// `fetch_time` is `None`), the profile is considered stale.
+    ///
+    /// This can be used to determine if the profile data should be fetched again
+    /// from the Mojang API: the vanilla launcher was seen refreshing profile
+    /// data every 60 seconds when re-entering the skin selection screen, and
+    /// external applications may change this data at any time.
+    fn is_fresh(&self) -> bool {
+        self.fetch_time.is_some_and(|last_profile_fetch_time| {
+            Instant::now().saturating_duration_since(last_profile_fetch_time)
+                < std::time::Duration::from_secs(60)
+        })
+    }
+
+    /// Returns the currently selected skin for this profile.
+    pub fn current_skin(&self) -> crate::Result<&MinecraftSkin> {
+        Ok(self
+            .skins
+            .iter()
+            .find(|skin| {
+                skin.state == MinecraftCharacterExpressionState::Active
+            })
+            // There should always be one active skin, even when the player uses their default skin
+            .ok_or_else(|| {
+                ErrorKind::OtherError("No active skin found".into())
+            })?)
+    }
+
+    /// Returns the currently selected cape for this profile.
+    pub fn current_cape(&self) -> Option<&MinecraftCape> {
+        self.capes.iter().find(|cape| {
+            cape.state == MinecraftCharacterExpressionState::Active
+        })
+    }
+}
+
+pub enum MaybeOnlineMinecraftProfile<'profile> {
+    /// An online profile, fetched from the Mojang API.
+    Online(Arc<MinecraftProfile>),
+    /// An offline profile, which has not been fetched from the Mojang API.
+    Offline(&'profile MinecraftProfile),
+}
+
+impl Deref for MaybeOnlineMinecraftProfile<'_> {
+    type Target = MinecraftProfile;
+
+    fn deref(&self) -> &Self::Target {
+        match self {
+            Self::Online(profile) => profile,
+            Self::Offline(profile) => profile,
+        }
+    }
+}
+
+#[tracing::instrument(skip(token))]
 async fn minecraft_profile(
    token: &str,
 ) -> Result<MinecraftProfile, MinecraftAuthenticationError> {
@ -926,6 +1323,9 @@ async fn minecraft_profile(
            .get("https://api.minecraftservices.com/minecraft/profile")
            .header("Accept", "application/json")
            .bearer_auth(token)
+            // Profiles may be refreshed periodically in response to user actions,
+            // so we want each refresh to be fast
+            .timeout(std::time::Duration::from_secs(10))
            .send()
    })
    .await
@ -942,14 +1342,23 @@ async fn minecraft_profile(
        }
    })?;

-    serde_json::from_str(&text).map_err(|source| {
-        MinecraftAuthenticationError::DeserializeResponse {
-            source,
-            raw: text,
-            step: MinecraftAuthStep::MinecraftProfile,
-            status_code: status,
-        }
-    })
+    let mut profile =
+        serde_json::from_str::<MinecraftProfile>(&text).map_err(|source| {
+            MinecraftAuthenticationError::DeserializeResponse {
+                source,
+                raw: text,
+                step: MinecraftAuthStep::MinecraftProfile,
+                status_code: status,
+            }
+        })?;
+    profile.fetch_time = Some(Instant::now());
+
+    tracing::debug!(
+        "Successfully fetched Minecraft profile for {}",
+        profile.name
+    );
+
+    Ok(profile)
 }

 #[derive(Deserialize)]
@ -967,7 +1376,7 @@ async fn minecraft_entitlements(
            .bearer_auth(token)
            .send()
    })
-        .await.map_err(|source| MinecraftAuthenticationError::Request { source, step: MinecraftAuthStep::MinecraftEntitlements })?;
+    .await.map_err(|source| MinecraftAuthenticationError::Request { source, step: MinecraftAuthStep::MinecraftEntitlements })?;

    let status = res.status();
    let text = res.text().await.map_err(|source| {
--- a/packages/app-lib/src/state/minecraft_skins/mod.rs
+++ b/packages/app-lib/src/state/minecraft_skins/mod.rs
@ -0,0 +1,180 @@
+use futures::{Stream, StreamExt, stream};
+use uuid::{Uuid, fmt::Hyphenated};
+
+use super::MinecraftSkinVariant;
+
+pub mod mojang_api;
+
+/// Represents the default cape for a Minecraft player.
+#[derive(Debug, Clone)]
+pub struct DefaultMinecraftCape {
+    /// The UUID of a cape for a Minecraft player, which comes from its profile.
+    ///
+    /// This UUID may or may not be different for every player, even if they refer to the same cape.
+    pub id: Uuid,
+}
+
+impl DefaultMinecraftCape {
+    pub async fn set(
+        minecraft_user_id: Uuid,
+        cape_id: Uuid,
+        db: impl sqlx::Acquire<'_, Database = sqlx::Sqlite>,
+    ) -> crate::Result<()> {
+        let minecraft_user_id = minecraft_user_id.as_hyphenated();
+        let cape_id = cape_id.as_hyphenated();
+
+        sqlx::query!(
+            "INSERT OR REPLACE INTO default_minecraft_capes (minecraft_user_uuid, id) VALUES (?, ?)",
+            minecraft_user_id, cape_id
+        )
+        .execute(&mut *db.acquire().await?)
+        .await?;
+
+        Ok(())
+    }
+
+    pub async fn get(
+        minecraft_user_id: Uuid,
+        db: impl sqlx::Acquire<'_, Database = sqlx::Sqlite>,
+    ) -> crate::Result<Option<Self>> {
+        let minecraft_user_id = minecraft_user_id.as_hyphenated();
+
+        Ok(sqlx::query_as!(
+            Self,
+            "SELECT id AS 'id: Hyphenated' FROM default_minecraft_capes WHERE minecraft_user_uuid = ?",
+            minecraft_user_id
+        )
+        .fetch_optional(&mut *db.acquire().await?)
+        .await?)
+    }
+
+    pub async fn remove(
+        minecraft_user_id: Uuid,
+        db: impl sqlx::Acquire<'_, Database = sqlx::Sqlite>,
+    ) -> crate::Result<()> {
+        let minecraft_user_id = minecraft_user_id.as_hyphenated();
+
+        sqlx::query!(
+            "DELETE FROM default_minecraft_capes WHERE minecraft_user_uuid = ?",
+            minecraft_user_id
+        )
+        .execute(&mut *db.acquire().await?)
+        .await?;
+
+        Ok(())
+    }
+}
+
+/// Represents a custom skin for a Minecraft player.
+#[derive(Debug, Clone)]
+pub struct CustomMinecraftSkin {
+    /// The key for the texture skin, which is akin to a hash that identifies it.
+    pub texture_key: String,
+    /// The variant of the skin model.
+    pub variant: MinecraftSkinVariant,
+    /// The UUID of the cape that this skin uses, which should match one of the
+    /// cape UUIDs the player has in its profile.
+    ///
+    /// If `None`, the skin does not have an explicit cape set, and the default
+    /// cape for this player, if any, should be used.
+    pub cape_id: Option<Uuid>,
+}
+
+impl CustomMinecraftSkin {
+    pub async fn add(
+        minecraft_user_id: Uuid,
+        texture_key: &str,
+        texture: &[u8],
+        variant: MinecraftSkinVariant,
+        cape_id: Option<Uuid>,
+        db: impl sqlx::Acquire<'_, Database = sqlx::Sqlite>,
+    ) -> crate::Result<()> {
+        let minecraft_user_id = minecraft_user_id.as_hyphenated();
+        let cape_id = cape_id.map(|id| id.hyphenated());
+
+        let mut transaction = db.begin().await?;
+
+        sqlx::query!(
+            "INSERT OR IGNORE INTO custom_minecraft_skins (minecraft_user_uuid, texture_key, variant, cape_id) VALUES (?, ?, ?, ?)",
+            minecraft_user_id, texture_key, variant, cape_id
+        )
+        .execute(&mut *transaction)
+        .await?;
+
+        sqlx::query!(
+            "INSERT OR REPLACE INTO custom_minecraft_skin_textures (texture_key, texture) VALUES (?, ?)",
+            texture_key, texture
+        )
+        .execute(&mut *transaction)
+        .await?;
+
+        transaction.commit().await?;
+
+        Ok(())
+    }
+
+    pub async fn get_many(
+        minecraft_user_id: Uuid,
+        offset: u32,
+        count: u32,
+        db: impl sqlx::Acquire<'_, Database = sqlx::Sqlite>,
+    ) -> crate::Result<impl Stream<Item = Self>> {
+        let minecraft_user_id = minecraft_user_id.as_hyphenated();
+
+        Ok(stream::iter(sqlx::query!(
+            "SELECT texture_key, variant AS 'variant: MinecraftSkinVariant', cape_id AS 'cape_id: Hyphenated' \
+            FROM custom_minecraft_skins \
+            WHERE minecraft_user_uuid = ? \
+            ORDER BY rowid ASC \
+            LIMIT ? OFFSET ?",
+            minecraft_user_id, count, offset
+        )
+        .fetch_all(&mut *db.acquire().await?)
+        .await?)
+        .map(|row| Self {
+            texture_key: row.texture_key,
+            variant: row.variant,
+            cape_id: row.cape_id.map(Uuid::from),
+        }))
+    }
+
+    pub async fn get_all(
+        minecraft_user_id: Uuid,
+        db: impl sqlx::Acquire<'_, Database = sqlx::Sqlite>,
+    ) -> crate::Result<impl Stream<Item = Self>> {
+        // Limit ourselves to 2048 skins, so that memory usage even when storing base64
+        // PNG data of a 64x64 texture with random pixels stays around ~150 MiB
+        Self::get_many(minecraft_user_id, 0, 2048, db).await
+    }
+
+    pub async fn texture_blob(
+        &self,
+        db: impl sqlx::Acquire<'_, Database = sqlx::Sqlite>,
+    ) -> crate::Result<Vec<u8>> {
+        Ok(sqlx::query_scalar!(
+            "SELECT texture FROM custom_minecraft_skin_textures WHERE texture_key = ?",
+            self.texture_key
+        )
+        .fetch_one(&mut *db.acquire().await?)
+        .await?)
+    }
+
+    pub async fn remove(
+        &self,
+        minecraft_user_id: Uuid,
+        db: impl sqlx::Acquire<'_, Database = sqlx::Sqlite>,
+    ) -> crate::Result<()> {
+        let minecraft_user_id = minecraft_user_id.as_hyphenated();
+        let cape_id = self.cape_id.map(|id| id.hyphenated());
+
+        sqlx::query!(
+            "DELETE FROM custom_minecraft_skins \
+            WHERE minecraft_user_uuid = ? AND texture_key = ? AND variant = ? AND cape_id = ?",
+            minecraft_user_id, self.texture_key, self.variant, cape_id
+        )
+        .execute(&mut *db.acquire().await?)
+        .await?;
+
+        Ok(())
+    }
+}
--- a/packages/app-lib/src/state/minecraft_skins/mojang_api.rs
+++ b/packages/app-lib/src/state/minecraft_skins/mojang_api.rs
@ -0,0 +1,142 @@
+use std::{error::Error, sync::Arc, time::Instant};
+
+use bytes::Bytes;
+use futures::TryStream;
+use reqwest::{Body, multipart::Part};
+use serde_json::json;
+use uuid::Uuid;
+
+use super::MinecraftSkinVariant;
+use crate::{
+    ErrorKind,
+    data::Credentials,
+    state::{MinecraftProfile, PROFILE_CACHE, ProfileCacheEntry},
+    util::fetch::REQWEST_CLIENT,
+};
+
+/// Provides operations for interacting with capes on a Minecraft player profile.
+pub struct MinecraftCapeOperation;
+
+impl MinecraftCapeOperation {
+    pub async fn equip(
+        credentials: &Credentials,
+        cape_id: Uuid,
+    ) -> crate::Result<()> {
+        update_profile_cache_from_response(
+            REQWEST_CLIENT
+                .put("https://api.minecraftservices.com/minecraft/profile/capes/active")
+                .header("Content-Type", "application/json; charset=utf-8")
+                .header("Accept", "application/json")
+                .bearer_auth(&credentials.access_token)
+                .json(&json!({
+                    "capeId": cape_id.hyphenated(),
+                }))
+                .send()
+                .await
+                .and_then(|response| response.error_for_status())?
+        )
+        .await;
+
+        Ok(())
+    }
+
+    pub async fn unequip_any(credentials: &Credentials) -> crate::Result<()> {
+        update_profile_cache_from_response(
+            REQWEST_CLIENT
+                .delete("https://api.minecraftservices.com/minecraft/profile/capes/active")
+                .header("Accept", "application/json")
+                .bearer_auth(&credentials.access_token)
+                .send()
+                .await
+                .and_then(|response| response.error_for_status())?
+        )
+        .await;
+
+        Ok(())
+    }
+}
+
+/// Provides operations for interacting with skins on a Minecraft player profile.
+pub struct MinecraftSkinOperation;
+
+impl MinecraftSkinOperation {
+    pub async fn equip<TextureStream>(
+        credentials: &Credentials,
+        texture: TextureStream,
+        variant: MinecraftSkinVariant,
+    ) -> crate::Result<()>
+    where
+        TextureStream: TryStream + Send + 'static,
+        TextureStream::Error: Into<Box<dyn Error + Send + Sync>>,
+        Bytes: From<TextureStream::Ok>,
+    {
+        let form = reqwest::multipart::Form::new()
+            .text(
+                "variant",
+                match variant {
+                    MinecraftSkinVariant::Slim => "slim",
+                    MinecraftSkinVariant::Classic => "classic",
+                    _ => {
+                        return Err(ErrorKind::OtherError(
+                            "Cannot equip skin of unknown model variant".into(),
+                        )
+                        .into());
+                    }
+                },
+            )
+            .part(
+                "file",
+                Part::stream(Body::wrap_stream(texture))
+                    .mime_str("image/png")?
+                    .file_name("skin.png"),
+            );
+
+        update_profile_cache_from_response(
+            REQWEST_CLIENT
+                .post(
+                    "https://api.minecraftservices.com/minecraft/profile/skins",
+                )
+                .header("Accept", "application/json")
+                .bearer_auth(&credentials.access_token)
+                .multipart(form)
+                .send()
+                .await
+                .and_then(|response| response.error_for_status())?,
+        )
+        .await;
+
+        Ok(())
+    }
+
+    pub async fn unequip_any(credentials: &Credentials) -> crate::Result<()> {
+        update_profile_cache_from_response(
+            REQWEST_CLIENT
+                .delete("https://api.minecraftservices.com/minecraft/profile/skins/active")
+                .header("Accept", "application/json")
+                .bearer_auth(&credentials.access_token)
+                .send()
+                .await
+                .and_then(|response| response.error_for_status())?
+        )
+        .await;
+
+        Ok(())
+    }
+}
+
+async fn update_profile_cache_from_response(response: reqwest::Response) {
+    let Some(mut profile) = response.json::<MinecraftProfile>().await.ok()
+    else {
+        tracing::warn!(
+            "Failed to parse player profile from skin or cape operation response, not updating profile cache"
+        );
+        return;
+    };
+
+    profile.fetch_time = Some(Instant::now());
+
+    PROFILE_CACHE
+        .lock()
+        .await
+        .insert(profile.id, ProfileCacheEntry::Hit(Arc::new(profile)));
+}
--- a/packages/app-lib/src/state/mod.rs
+++ b/packages/app-lib/src/state/mod.rs
@ -28,6 +28,8 @@ pub use self::discord::*;
 mod minecraft_auth;
 pub use self::minecraft_auth::*;

+pub mod minecraft_skins;
+
 mod cache;
 pub use self::cache::*;
Author	SHA1	Message	Date
Alejandro González	3587b0a9ce	fix(app-lib/minecraft_skins): fix custom skin removal from DB not working	2025-06-14 16:22:54 +02:00
Alejandro González	9dda6e0016	tweak(app-lib): improve consistency of skin field serialization case	2025-06-14 16:22:54 +02:00
Alejandro González	65d15fe751	fix: less racy auth token refresh logic This may help with issues reported by users where the access token is invalid and can't be used to join servers over long periods of time.	2025-06-14 16:22:54 +02:00
Alejandro González	8ecc7c5b86	chore: fix comment typo spotted by Copilot	2025-06-14 16:22:53 +02:00
Alejandro González	a8226131d5	enh(app/skin-selector): better DB intension through deferred FKs, further PNG validations	2025-06-14 16:22:53 +02:00
Alejandro González	e189219407	feat(app): skin selector backend	2025-06-14 16:22:52 +02:00
Alejandro González	f07bc86711	chore: remove dead `profile_run_credentials` plugin command	2025-06-14 16:17:44 +02:00
Alejandro González	23f0c1dbf7	chore: document differences between similar `Credentials` methods	2025-06-14 16:16:24 +02:00
Alejandro González	8abbc021ea	chore: fix new `prettier` lints	2025-06-14 16:16:24 +02:00
Alejandro González	ed8ff79809	refactor(theseus): extend auth subsystem to fetch complete user profiles	2025-06-14 16:16:22 +02:00
Alejandro González	f210de563d	chore: typo fix and formatting tidyups	2025-06-14 16:14:29 +02:00