From 362fd7f32aedfe0f7e31bced6439b075df37382e Mon Sep 17 00:00:00 2001
From: didirus4 <DIDIRUS@yandex.ru>
Date: Wed, 16 Jul 2025 02:27:48 +0300
Subject: [PATCH 1/2] feat: Implement Ely By skin system

---
 .../src/components/ui/AccountsCard.vue        |   3 +-
 .../InstallationSettings.vue                  |  64 ++++
 apps/app-frontend/src/helpers/update.js       |   4 +-
 apps/app-frontend/src/helpers/utils.js        |   9 +-
 apps/app/build.rs                             |   3 +-
 apps/app/src/api/utils.rs                     |  31 +-
 apps/app/tauri.conf.json                      |   2 +-
 packages/app-lib/src/error.rs                 |  35 ++
 packages/app-lib/src/launcher/mod.rs          |   1 +
 packages/app-lib/src/util/utils.rs            | 325 +++++++++++++++++-
 10 files changed, 454 insertions(+), 23 deletions(-)

diff --git a/apps/app-frontend/src/components/ui/AccountsCard.vue b/apps/app-frontend/src/components/ui/AccountsCard.vue
index 7b03e1f39..69ee0e01e 100644
--- a/apps/app-frontend/src/components/ui/AccountsCard.vue
+++ b/apps/app-frontend/src/components/ui/AccountsCard.vue
@@ -50,9 +50,8 @@
           color="primary"
           @click="login()"
         >
-          <LogInIcon v-if="!loginDisabled" />
+          <MicrosoftIcon v-if="!loginDisabled"/>
           <SpinnerIcon v-else class="animate-spin" />
-          <MicrosoftIcon/>
         </Button>
         <Button v-tooltip="'Add offline'" icon-only @click="tryOfflineLogin()">
           <PirateIcon />
diff --git a/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue b/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue
index 7810581a3..ff16faadb 100644
--- a/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue
+++ b/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue
@@ -26,6 +26,7 @@ import {
   type Version,
 } from '@modrinth/utils'
 import ConfirmModalWrapper from '@/components/ui/modal/ConfirmModalWrapper.vue'
+import ModalWrapper from '@/components/ui/modal/ModalWrapper.vue'
 import { get_project, get_version_many } from '@/helpers/cache'
 import ModpackVersionModal from '@/components/ui/ModpackVersionModal.vue'
 import dayjs from 'dayjs'
@@ -35,6 +36,11 @@ import type {
   Manifest,
 } from '../../../helpers/types'
 
+import { initAuthlibPatching } from '@/helpers/utils.js'
+const authLibPatchingModal = ref(null)
+const isAuthLibPatchedSuccess = ref(false)
+const isAuthLibPatching = ref(false)
+
 const { formatMessage } = useVIntl()
 
 const repairConfirmModal = ref()
@@ -447,9 +453,43 @@ const messages = defineMessages({
     defaultMessage: 'reinstall',
   },
 })
+
+async function handleInitAuthLibPatching(ismojang: boolean) {
+  isAuthLibPatching.value = true
+  let state = false
+  let instance_path =  props.instance.loader_version != null ? props.instance.game_version + "-" + props.instance.loader_version : props.instance.game_version
+  try {
+    state = await initAuthlibPatching(instance_path, ismojang)
+  } catch (err) {
+    console.error(err)
+  }
+  isAuthLibPatching.value = false
+  isAuthLibPatchedSuccess.value = state
+  authLibPatchingModal.value.show()
+}
 </script>
 
 <template>
+  <ModalWrapper
+    ref="authLibPatchingModal"
+    :header="'AuthLib installation report'"
+    :closable="true"
+    @close="authLibPatchingModal.hide()"
+  >
+    <div class="modal-body">
+      <h2 class="text-lg font-bold text-contrast space-y-2">
+        <p class="flex items-center gap-2 neon-text">
+          <span v-if="isAuthLibPatchedSuccess" class="neon-text">
+            AuthLib installation completed successfully! Now you can log in and play!
+          </span>
+          <span v-else class="neon-text">
+            Failed to install AuthLib. It's possible that no compatible AuthLib version was found for the selected game and/or mod loader version.
+            There may also be a problem with accessing resources behind CloudFlare.
+          </span>
+        </p>
+      </h2>
+    </div>
+  </ModalWrapper>
   <ConfirmModalWrapper
     ref="repairConfirmModal"
     :title="formatMessage(messages.repairConfirmTitle)"
@@ -720,6 +760,24 @@ const messages = defineMessages({
           </button>
         </ButtonStyled>
       </div>
+      <h2 class="m-0 mt-4 text-lg font-extrabold text-contrast block">
+        <div v-if="isAuthLibPatching" class="w-6 h-6 cursor-pointer hover:brightness-75 neon-icon pulse">
+          <SpinnerIcon class="size-4 animate-spin" />
+        </div>
+        Auth system (Skins) <span class="text-sm font-bold px-2 bg-brand-highlight text-brand rounded-full">Beta</span>
+      </h2>
+      <div class="mt-4 flex gap-2">
+        <ButtonStyled class="neon-button neon">
+          <button :disabled="isAuthLibPatching" @click="handleInitAuthLibPatching(true)">
+            Install Microsoft
+          </button>
+        </ButtonStyled>
+        <ButtonStyled class="neon-button neon">
+          <button :disabled="isAuthLibPatching" @click="handleInitAuthLibPatching(false) ">
+            Install Ely.By
+          </button>
+        </ButtonStyled>
+      </div>
     </template>
     <template v-else>
       <template v-if="instance.linked_data && instance.linked_data.locked">
@@ -787,3 +845,9 @@ const messages = defineMessages({
     </template>
   </div>
 </template>
+
+<style lang="scss" scoped>
+@import '../../../../../../packages/assets/styles/neon-button.scss';
+@import '../../../../../../packages/assets/styles/neon-text.scss';
+@import '../../../../../../packages/assets/styles/neon-icon.scss';
+</style>
\ No newline at end of file
diff --git a/apps/app-frontend/src/helpers/update.js b/apps/app-frontend/src/helpers/update.js
index cea6c6bd4..f7033b7ac 100644
--- a/apps/app-frontend/src/helpers/update.js
+++ b/apps/app-frontend/src/helpers/update.js
@@ -1,6 +1,6 @@
 import { ref } from 'vue'
 import { getVersion } from '@tauri-apps/api/app'
-import { getArtifact, getOS } from '@/helpers/utils.js'
+import { initUpdateLauncher, getOS } from '@/helpers/utils.js'
 
 export const allowState = ref(false)
 export const installState = ref(false)
@@ -52,7 +52,7 @@ export async function getRemote(isDownloadState) {
       installState.value = true;
       const builds = remoteData.assets;
       const fileName = getInstaller(getExtension(), builds);
-      result = fileName ? await getArtifact(fileName[1], fileName[0], currentOS.value, true) : false;
+      result = fileName ? await initUpdateLauncher(fileName[1], fileName[0], currentOS.value, true) : false;
       installState.value = false;
     }
 
diff --git a/apps/app-frontend/src/helpers/utils.js b/apps/app-frontend/src/helpers/utils.js
index ac950e175..99cbde38f 100644
--- a/apps/app-frontend/src/helpers/utils.js
+++ b/apps/app-frontend/src/helpers/utils.js
@@ -11,9 +11,9 @@ export async function getOS() {
 }
 
 // [AR] Feature
-export async function getArtifact(downloadurl, filename, ostype, autoupdatesupported) {
+export async function initUpdateLauncher(downloadurl, filename, ostype, autoupdatesupported) {
   console.log('Downloading build', downloadurl, filename, ostype, autoupdatesupported)
-  return await invoke('plugin:utils|get_artifact', { downloadurl, filename, ostype, autoupdatesupported })
+  return await invoke('plugin:utils|init_update_launcher', { downloadurl, filename, ostype, autoupdatesupported })
 }
 
 // [AR] Patch fix
@@ -21,6 +21,11 @@ export async function applyMigrationFix(eol) {
   return await invoke('plugin:utils|apply_migration_fix', { eol })
 }
 
+// [AR] Feature
+export async function initAuthlibPatching(minecraftversion, ismojang) {
+  return await invoke('plugin:utils|init_authlib_patching', { minecraftversion, ismojang })
+}
+
 export async function openPath(path) {
   return await invoke('plugin:utils|open_path', { path })
 }
diff --git a/apps/app/build.rs b/apps/app/build.rs
index 4942497aa..5a35c88df 100644
--- a/apps/app/build.rs
+++ b/apps/app/build.rs
@@ -218,8 +218,9 @@ fn main() {
                 "utils",
                 InlinedPlugin::new()
                     .commands(&[
+                        "init_authlib_patching",
                         "apply_migration_fix",
-                        "get_artifact",
+                        "init_update_launcher",
                         "get_os",
                         "should_disable_mouseover",
                         "highlight_in_folder",
diff --git a/apps/app/src/api/utils.rs b/apps/app/src/api/utils.rs
index 452079157..951affa63 100644
--- a/apps/app/src/api/utils.rs
+++ b/apps/app/src/api/utils.rs
@@ -10,14 +10,15 @@ use crate::api::{Result, TheseusSerializableError};
 use dashmap::DashMap;
 use std::path::{Path, PathBuf};
 use theseus::prelude::canonicalize;
-use url::Url;
 use theseus::util::utils;
+use url::Url;
 
 pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
     tauri::plugin::Builder::new("utils")
         .invoke_handler(tauri::generate_handler![
+            init_authlib_patching,
             apply_migration_fix,
-            get_artifact,
+            init_update_launcher,
             get_os,
             should_disable_mouseover,
             highlight_in_folder,
@@ -29,6 +30,17 @@ pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
         .build()
 }
 
+/// [AR] Feature
+#[tauri::command]
+pub async fn init_authlib_patching(
+    minecraftversion: &str,
+    ismojang: bool,
+) -> Result<bool> {
+    let result =
+        utils::init_authlib_patching(minecraftversion, ismojang).await?;
+    Ok(result)
+}
+
 /// [AR] Patch fix
 #[tauri::command]
 pub async fn apply_migration_fix(eol: &str) -> Result<bool> {
@@ -38,8 +50,19 @@ pub async fn apply_migration_fix(eol: &str) -> Result<bool> {
 
 /// [AR] Feature
 #[tauri::command]
-pub async fn get_artifact(downloadurl: &str, filename: &str, ostype: &str, autoupdatesupported: bool) -> Result<()> {
-    let _ = utils::init_download(downloadurl, filename, ostype, autoupdatesupported).await;
+pub async fn init_update_launcher(
+    downloadurl: &str,
+    filename: &str,
+    ostype: &str,
+    autoupdatesupported: bool,
+) -> Result<()> {
+    let _ = utils::init_update_launcher(
+        downloadurl,
+        filename,
+        ostype,
+        autoupdatesupported,
+    )
+    .await;
     Ok(())
 }
 
diff --git a/apps/app/tauri.conf.json b/apps/app/tauri.conf.json
index 4ebb2aa5f..cfc271565 100644
--- a/apps/app/tauri.conf.json
+++ b/apps/app/tauri.conf.json
@@ -41,7 +41,7 @@
     ]
   },
   "productName": "AstralRinth App",
-  "version": "0.10.303",
+  "version": "0.10.304",
   "mainBinaryName": "AstralRinth App",
   "identifier": "AstralRinthApp",
   "plugins": {
diff --git a/packages/app-lib/src/error.rs b/packages/app-lib/src/error.rs
index 75c144f55..360984efd 100644
--- a/packages/app-lib/src/error.rs
+++ b/packages/app-lib/src/error.rs
@@ -151,6 +151,41 @@ pub enum ErrorKind {
         "A skin texture must have a dimension of either 64x64 or 64x32 pixels"
     )]
     InvalidSkinTexture,
+
+    #[error(
+        "[AR] Target minecraft {minecraft_version} version doesn't exist."
+    )]
+    InvalidMinecraftVersion {
+        minecraft_version: String,
+    },
+
+    #[error(
+        "[AR] Target metadata not found for minecraft version {minecraft_version}."
+    )]
+    MinecraftMetadataNotFound {
+        minecraft_version: String,
+    },
+
+    #[error(
+        "[AR] Network error: {error}"
+    )]
+    NetworkErrorOccurred {
+        error: String,
+    },
+
+    #[error(
+        "[AR] IO error: {error}"
+    )]
+    IOErrorOccurred {
+        error: String,
+    },
+
+    #[error(
+        "[AR] Parse error: {reason}"
+    )]
+    ParseError {
+        reason: String,
+    },
 }
 
 #[derive(Debug)]
diff --git a/packages/app-lib/src/launcher/mod.rs b/packages/app-lib/src/launcher/mod.rs
index f1b5deb85..a7d0708e3 100644
--- a/packages/app-lib/src/launcher/mod.rs
+++ b/packages/app-lib/src/launcher/mod.rs
@@ -633,6 +633,7 @@ pub async fn launch_minecraft(
         command.arg("--add-opens=jdk.internal/jdk.internal.misc=ALL-UNNAMED");
     }
 
+    // FIXME: Fix ElyBy integration with this patch.
     // [AR] Patch
     if credentials.access_token == "null" && credentials.refresh_token == "null" {
         if version_jar == "1.16.4" || version_jar == "1.16.5" {
diff --git a/packages/app-lib/src/util/utils.rs b/packages/app-lib/src/util/utils.rs
index adebc3a67..e4d9a2ab1 100644
--- a/packages/app-lib/src/util/utils.rs
+++ b/packages/app-lib/src/util/utils.rs
@@ -1,12 +1,12 @@
-///
-/// [AR] Feature
-///
-use crate::Result;
 use crate::api::update;
 use crate::state::db;
+///
+/// [AR] Feature Utils
+///
+use crate::{Result, State};
 use serde::{Deserialize, Serialize};
 use std::process;
-use tokio::io;
+use tokio::{fs, io};
 
 const PACKAGE_JSON_CONTENT: &str =
     // include_str!("../../../../apps/app-frontend/package.json");
@@ -17,13 +17,311 @@ pub struct Launcher {
     pub version: String,
 }
 
-pub fn read_package_json() -> io::Result<Launcher> {
-    // Deserialize the content of package.json into a Launcher struct
-    let launcher: Launcher = serde_json::from_str(PACKAGE_JSON_CONTENT)?;
+#[derive(Debug, Deserialize)]
+struct Artifact {
+    path: Option<String>,
+    sha1: Option<String>,
+    url: Option<String>,
+}
 
+#[derive(Debug, Deserialize)]
+struct Downloads {
+    artifact: Option<Artifact>,
+}
+
+#[derive(Debug, Deserialize)]
+struct Library {
+    name: String,
+    downloads: Option<Downloads>,
+}
+
+#[derive(Debug, Deserialize)]
+struct VersionJson {
+    libraries: Vec<Library>,
+}
+
+/// Deserialize the content of package.json into a Launcher struct
+pub fn read_package_json() -> io::Result<Launcher> {
+    let launcher: Launcher = serde_json::from_str(PACKAGE_JSON_CONTENT)?;
     Ok(launcher)
 }
 
+/// ### AR • Universal Write (IO) Function
+/// Saves the downloaded bytes to the `libraries` directory using the given relative path.
+async fn write_file_to_libraries(
+    relative_path: &str,
+    bytes: &bytes::Bytes,
+) -> Result<()> {
+    let state = State::get().await?;
+    let output_path = state.directories.libraries_dir().join(relative_path);
+
+    fs::write(&output_path, bytes).await.map_err(|e| {
+        tracing::error!("[AR] • Failed to save file: {:?}", e);
+        crate::ErrorKind::IOErrorOccurred {
+            error: format!("Failed to save file: {e}"),
+        }
+        .as_error()
+    })
+}
+
+/// ### AR • AuthLib (Ely By)
+/// Initializes the AuthLib patching process.
+///
+/// Returns `true` if the authlib patched successfully.
+pub async fn init_authlib_patching(
+    minecraft_version: &str,
+    is_mojang: bool,
+) -> Result<bool> {
+    let minecraft_library_metadata = get_minecraft_library_metadata(minecraft_version).await?;
+    // Parses the AuthLib version from string
+    // Example output: "com.mojang:authlib:6.0.58" -> "6.0.58"
+    let authlib_version = minecraft_library_metadata.name.split(':').nth(2).unwrap_or("unknown");
+    
+    tracing::info!(
+        "[AR] • Attempting to download AuthLib {}.",
+        authlib_version
+    );
+
+    download_authlib(
+        &minecraft_library_metadata,
+        authlib_version,
+        minecraft_version,
+        is_mojang,
+    )
+    .await
+}
+
+/// ### AR • AuthLib (Ely By)
+/// Downloads the AuthLib file from Mojang libraries or Git Astralium services.
+async fn download_authlib(
+    minecraft_library_metadata: &Library,
+    authlib_version: &str,
+    minecraft_version: &str,
+    is_mojang: bool,
+) -> Result<bool> {
+    let state = State::get().await?;
+    let (url, path) = extract_download_info(minecraft_library_metadata, minecraft_version)?;
+    let mut download_url = url.to_string();
+    let full_path = state.directories.libraries_dir().join(path);
+
+    if !is_mojang {
+        tracing::info!(
+            "[AR] • Attempting to download AuthLib from Git Astralium"
+        );
+        download_url = extract_ely_authlib_url(authlib_version).await?;
+    }
+    tracing::info!("[AR] • Downloading AuthLib from URL: {}", download_url);
+    let bytes = fetch_bytes_from_url(&download_url).await?;
+    tracing::info!("[AR] • Will save to path: {}", full_path.to_str().unwrap());
+    write_file_to_libraries(full_path.to_str().unwrap(), &bytes).await?;
+    tracing::info!("[AR] • Successfully saved AuthLib to {:?}", full_path);
+    Ok(true)
+}
+
+/// ### AR • AuthLib (Ely By)
+/// Parses the ElyIntegration release JSON and returns the download URL for the given AuthLib version.
+async fn extract_ely_authlib_url(authlib_version: &str) -> Result<String> {
+    let url = "https://git.astralium.su/api/v1/repos/didirus/ElyIntegration/releases/latest";
+
+    let response = reqwest::get(url).await.map_err(|e| {
+        tracing::error!(
+            "[AR] • Failed to fetch ElyIntegration release JSON: {:?}",
+            e
+        );
+        crate::ErrorKind::NetworkErrorOccurred {
+            error: format!("Failed to fetch ElyIntegration release JSON: {}", e),
+        }
+        .as_error()
+    })?;
+
+    let json: serde_json::Value = response.json().await.map_err(|e| {
+        tracing::error!("[AR] • Failed to parse ElyIntegration JSON: {:?}", e);
+        crate::ErrorKind::ParseError {
+            reason: format!("Failed to parse ElyIntegration JSON: {}", e),
+        }
+        .as_error()
+    })?;
+
+    let assets =
+        json.get("assets")
+            .and_then(|v| v.as_array())
+            .ok_or_else(|| {
+                crate::ErrorKind::ParseError {
+                    reason: "Missing 'assets' array".into(),
+                }
+                .as_error()
+            })?;
+
+    let asset = assets
+        .iter()
+        .find(|a| {
+            a.get("name")
+                .and_then(|n| n.as_str())
+                .map(|n| n.contains(authlib_version))
+                .unwrap_or(false)
+        })
+        .ok_or_else(|| {
+            crate::ErrorKind::ParseError {
+                reason: format!(
+                    "No matching asset for authlib-{}.jar",
+                    authlib_version
+                ),
+            }
+            .as_error()
+        })?;
+
+    let download_url = asset
+        .get("browser_download_url")
+        .and_then(|u| u.as_str())
+        .ok_or_else(|| {
+            crate::ErrorKind::ParseError {
+                reason: "Missing 'browser_download_url'".into(),
+            }
+            .as_error()
+        })?;
+
+    Ok(download_url.to_string())
+}
+
+/// ### AR • AuthLib (Ely By)
+/// Extracts the artifact URL and Path from the library structure.
+///
+/// Returns a tuple of references to the URL and path strings,
+/// or an error if the required metadata is missing.
+fn extract_download_info<'a>(
+    minecraft_library_metadata: &'a Library,
+    minecraft_version: &str,
+) -> Result<(&'a str, &'a str)> {
+    let artifact = minecraft_library_metadata
+        .downloads
+        .as_ref()
+        .and_then(|d| d.artifact.as_ref())
+        .ok_or_else(|| {
+            crate::ErrorKind::MinecraftMetadataNotFound {
+                minecraft_version: minecraft_version.to_string(),
+            }
+            .as_error()
+        })?;
+
+    let url = artifact.url.as_deref().ok_or_else(|| {
+        crate::ErrorKind::MinecraftMetadataNotFound {
+            minecraft_version: minecraft_version.to_string(),
+        }
+        .as_error()
+    })?;
+
+    let path = artifact.path.as_deref().ok_or_else(|| {
+        crate::ErrorKind::MinecraftMetadataNotFound {
+            minecraft_version: minecraft_version.to_string(),
+        }
+        .as_error()
+    })?;
+
+    Ok((url, path))
+}
+
+/// ### AR • AuthLib (Ely By)
+/// Downloads bytes from the provided URL with a 15 second timeout.
+async fn fetch_bytes_from_url(url: &str) -> Result<bytes::Bytes> {
+    // Create client instance with request timeout.
+    let client = reqwest::Client::new();
+    const TIMEOUT_SECONDS: u64 = 15;
+
+    let response = tokio::time::timeout(
+        std::time::Duration::from_secs(TIMEOUT_SECONDS),
+        client.get(url).send(),
+    )
+    .await
+    .map_err(|_| {
+        tracing::error!("[AR] • Download timed out after {} seconds", TIMEOUT_SECONDS);
+        crate::ErrorKind::NetworkErrorOccurred {
+            error: format!("Download timed out after {TIMEOUT_SECONDS} seconds").to_string(),
+        }
+        .as_error()
+    })?
+    .map_err(|e| {
+        tracing::error!("[AR] • Request error: {:?}", e);
+        crate::ErrorKind::NetworkErrorOccurred {
+            error: format!("Request error: {e}"),
+        }
+        .as_error()
+    })?;
+
+    if !response.status().is_success() {
+        let status = response.status().to_string();
+        tracing::error!("[AR] • Failed to download authlib: HTTP {}", status);
+        return Err(crate::ErrorKind::NetworkErrorOccurred {
+            error: format!("Failed to download authlib: HTTP {status}"),
+        }
+        .as_error());
+    }
+
+    response.bytes().await.map_err(|e| {
+        tracing::error!("[AR] • Failed to read response bytes: {:?}", e);
+        crate::ErrorKind::NetworkErrorOccurred {
+            error: format!("Failed to read response bytes: {e}"),
+        }
+        .as_error()
+    })
+}
+
+/// ### AR • AuthLib (Ely By)
+/// Gets the Minecraft library metadata from the local libraries directory.
+async fn get_minecraft_library_metadata(minecraft_version: &str) -> Result<Library> {
+    let state = State::get().await?;
+
+    let path = state
+        .directories
+        .version_dir(minecraft_version)
+        .join(format!("{}.json", minecraft_version));
+    if !path.exists() {
+        tracing::error!("[AR] • File not found: {:#?}", path);
+        return Err(crate::ErrorKind::InvalidMinecraftVersion {
+            minecraft_version: minecraft_version.to_string(),
+        }
+        .as_error());
+    }
+
+    let content = fs::read_to_string(&path).await?;
+    let version_data: VersionJson = serde_json::from_str(&content)?;
+
+    for lib in version_data.libraries {
+        if lib.name.contains("com.mojang:authlib") {
+            if let Some(downloads) = &lib.downloads {
+                if let Some(artifact) = &downloads.artifact {
+                    if artifact.path.is_some()
+                        && artifact.url.is_some()
+                        && artifact.sha1.is_some()
+                    {
+                        tracing::info!("[AR] • Found AuthLib: {}", lib.name);
+                        tracing::info!(
+                            "[AR] • Path: {}",
+                            artifact.path.as_ref().unwrap()
+                        );
+                        tracing::info!(
+                            "[AR] • URL: {}",
+                            artifact.url.as_ref().unwrap()
+                        );
+                        tracing::info!(
+                            "[AR] • SHA1: {}",
+                            artifact.sha1.as_ref().unwrap()
+                        );
+
+                        return Ok(lib);
+                    }
+                }
+            }
+        }
+    }
+
+    Err(crate::ErrorKind::MinecraftMetadataNotFound {
+        minecraft_version: minecraft_version.to_string(),
+    }
+    .as_error())
+}
+
+/// ### AR • Migration
+/// Applying migration fix for SQLite database.
 pub async fn apply_migration_fix(eol: &str) -> Result<bool> {
     tracing::info!("[AR] • Attempting to apply migration fix");
     let patched = db::apply_migration_fix(eol).await?;
@@ -35,14 +333,19 @@ pub async fn apply_migration_fix(eol: &str) -> Result<bool> {
     Ok(patched)
 }
 
-pub async fn init_download(
+/// ### AR • Updater
+/// Initialize the update launcher.
+pub async fn init_update_launcher(
     download_url: &str,
     local_filename: &str,
     os_type: &str,
     auto_update_supported: bool,
 ) -> Result<()> {
-    println!("[AR] • Initialize downloading from • {:?}", download_url);
-    println!("[AR] • Save local file name • {:?}", local_filename);
+    tracing::info!("[AR] • Initialize downloading from • {:?}", download_url);
+    tracing::info!("[AR] • Save local file name • {:?}", local_filename);
+    tracing::info!("[AR] • OS type • {}", os_type);
+    tracing::info!("[AR] • Auto update supported • {}", auto_update_supported);
+
     if let Err(e) = update::get_resource(
         download_url,
         local_filename,

From df9bbe3ba0f6b00ddf3198142b4d04f26a609946 Mon Sep 17 00:00:00 2001
From: didirus4 <DIDIRUS@yandex.ru>
Date: Wed, 16 Jul 2025 02:31:59 +0300
Subject: [PATCH 2/2] chore: add patch file to patches directory

---
 patches/elyby-integration.patch | 675 ++++++++++++++++++++++++++++++++
 1 file changed, 675 insertions(+)
 create mode 100644 patches/elyby-integration.patch

diff --git a/patches/elyby-integration.patch b/patches/elyby-integration.patch
new file mode 100644
index 000000000..252bcc11f
--- /dev/null
+++ b/patches/elyby-integration.patch
@@ -0,0 +1,675 @@
+diff --git a/apps/app-frontend/src/components/ui/AccountsCard.vue b/apps/app-frontend/src/components/ui/AccountsCard.vue
+index 7b03e1f39..69ee0e01e 100644
+--- a/apps/app-frontend/src/components/ui/AccountsCard.vue
++++ b/apps/app-frontend/src/components/ui/AccountsCard.vue
+@@ -50,9 +50,8 @@
+           color="primary"
+           @click="login()"
+         >
+-          <LogInIcon v-if="!loginDisabled" />
++          <MicrosoftIcon v-if="!loginDisabled"/>
+           <SpinnerIcon v-else class="animate-spin" />
+-          <MicrosoftIcon/>
+         </Button>
+         <Button v-tooltip="'Add offline'" icon-only @click="tryOfflineLogin()">
+           <PirateIcon />
+diff --git a/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue b/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue
+index 7810581a3..ff16faadb 100644
+--- a/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue
++++ b/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue
+@@ -26,6 +26,7 @@ import {
+   type Version,
+ } from '@modrinth/utils'
+ import ConfirmModalWrapper from '@/components/ui/modal/ConfirmModalWrapper.vue'
++import ModalWrapper from '@/components/ui/modal/ModalWrapper.vue'
+ import { get_project, get_version_many } from '@/helpers/cache'
+ import ModpackVersionModal from '@/components/ui/ModpackVersionModal.vue'
+ import dayjs from 'dayjs'
+@@ -35,6 +36,11 @@ import type {
+   Manifest,
+ } from '../../../helpers/types'
+ 
++import { initAuthlibPatching } from '@/helpers/utils.js'
++const authLibPatchingModal = ref(null)
++const isAuthLibPatchedSuccess = ref(false)
++const isAuthLibPatching = ref(false)
++
+ const { formatMessage } = useVIntl()
+ 
+ const repairConfirmModal = ref()
+@@ -447,9 +453,43 @@ const messages = defineMessages({
+     defaultMessage: 'reinstall',
+   },
+ })
++
++async function handleInitAuthLibPatching(ismojang: boolean) {
++  isAuthLibPatching.value = true
++  let state = false
++  let instance_path =  props.instance.loader_version != null ? props.instance.game_version + "-" + props.instance.loader_version : props.instance.game_version
++  try {
++    state = await initAuthlibPatching(instance_path, ismojang)
++  } catch (err) {
++    console.error(err)
++  }
++  isAuthLibPatching.value = false
++  isAuthLibPatchedSuccess.value = state
++  authLibPatchingModal.value.show()
++}
+ </script>
+ 
+ <template>
++  <ModalWrapper
++    ref="authLibPatchingModal"
++    :header="'AuthLib installation report'"
++    :closable="true"
++    @close="authLibPatchingModal.hide()"
++  >
++    <div class="modal-body">
++      <h2 class="text-lg font-bold text-contrast space-y-2">
++        <p class="flex items-center gap-2 neon-text">
++          <span v-if="isAuthLibPatchedSuccess" class="neon-text">
++            AuthLib installation completed successfully! Now you can log in and play!
++          </span>
++          <span v-else class="neon-text">
++            Failed to install AuthLib. It's possible that no compatible AuthLib version was found for the selected game and/or mod loader version.
++            There may also be a problem with accessing resources behind CloudFlare.
++          </span>
++        </p>
++      </h2>
++    </div>
++  </ModalWrapper>
+   <ConfirmModalWrapper
+     ref="repairConfirmModal"
+     :title="formatMessage(messages.repairConfirmTitle)"
+@@ -720,6 +760,24 @@ const messages = defineMessages({
+           </button>
+         </ButtonStyled>
+       </div>
++      <h2 class="m-0 mt-4 text-lg font-extrabold text-contrast block">
++        <div v-if="isAuthLibPatching" class="w-6 h-6 cursor-pointer hover:brightness-75 neon-icon pulse">
++          <SpinnerIcon class="size-4 animate-spin" />
++        </div>
++        Auth system (Skins) <span class="text-sm font-bold px-2 bg-brand-highlight text-brand rounded-full">Beta</span>
++      </h2>
++      <div class="mt-4 flex gap-2">
++        <ButtonStyled class="neon-button neon">
++          <button :disabled="isAuthLibPatching" @click="handleInitAuthLibPatching(true)">
++            Install Microsoft
++          </button>
++        </ButtonStyled>
++        <ButtonStyled class="neon-button neon">
++          <button :disabled="isAuthLibPatching" @click="handleInitAuthLibPatching(false) ">
++            Install Ely.By
++          </button>
++        </ButtonStyled>
++      </div>
+     </template>
+     <template v-else>
+       <template v-if="instance.linked_data && instance.linked_data.locked">
+@@ -787,3 +845,9 @@ const messages = defineMessages({
+     </template>
+   </div>
+ </template>
++
++<style lang="scss" scoped>
++@import '../../../../../../packages/assets/styles/neon-button.scss';
++@import '../../../../../../packages/assets/styles/neon-text.scss';
++@import '../../../../../../packages/assets/styles/neon-icon.scss';
++</style>
+\ No newline at end of file
+diff --git a/apps/app-frontend/src/helpers/update.js b/apps/app-frontend/src/helpers/update.js
+index cea6c6bd4..f7033b7ac 100644
+--- a/apps/app-frontend/src/helpers/update.js
++++ b/apps/app-frontend/src/helpers/update.js
+@@ -1,6 +1,6 @@
+ import { ref } from 'vue'
+ import { getVersion } from '@tauri-apps/api/app'
+-import { getArtifact, getOS } from '@/helpers/utils.js'
++import { initUpdateLauncher, getOS } from '@/helpers/utils.js'
+ 
+ export const allowState = ref(false)
+ export const installState = ref(false)
+@@ -52,7 +52,7 @@ export async function getRemote(isDownloadState) {
+       installState.value = true;
+       const builds = remoteData.assets;
+       const fileName = getInstaller(getExtension(), builds);
+-      result = fileName ? await getArtifact(fileName[1], fileName[0], currentOS.value, true) : false;
++      result = fileName ? await initUpdateLauncher(fileName[1], fileName[0], currentOS.value, true) : false;
+       installState.value = false;
+     }
+ 
+diff --git a/apps/app-frontend/src/helpers/utils.js b/apps/app-frontend/src/helpers/utils.js
+index ac950e175..99cbde38f 100644
+--- a/apps/app-frontend/src/helpers/utils.js
++++ b/apps/app-frontend/src/helpers/utils.js
+@@ -11,9 +11,9 @@ export async function getOS() {
+ }
+ 
+ // [AR] Feature
+-export async function getArtifact(downloadurl, filename, ostype, autoupdatesupported) {
++export async function initUpdateLauncher(downloadurl, filename, ostype, autoupdatesupported) {
+   console.log('Downloading build', downloadurl, filename, ostype, autoupdatesupported)
+-  return await invoke('plugin:utils|get_artifact', { downloadurl, filename, ostype, autoupdatesupported })
++  return await invoke('plugin:utils|init_update_launcher', { downloadurl, filename, ostype, autoupdatesupported })
+ }
+ 
+ // [AR] Patch fix
+@@ -21,6 +21,11 @@ export async function applyMigrationFix(eol) {
+   return await invoke('plugin:utils|apply_migration_fix', { eol })
+ }
+ 
++// [AR] Feature
++export async function initAuthlibPatching(minecraftversion, ismojang) {
++  return await invoke('plugin:utils|init_authlib_patching', { minecraftversion, ismojang })
++}
++
+ export async function openPath(path) {
+   return await invoke('plugin:utils|open_path', { path })
+ }
+diff --git a/apps/app/build.rs b/apps/app/build.rs
+index 4942497aa..5a35c88df 100644
+--- a/apps/app/build.rs
++++ b/apps/app/build.rs
+@@ -218,8 +218,9 @@ fn main() {
+                 "utils",
+                 InlinedPlugin::new()
+                     .commands(&[
++                        "init_authlib_patching",
+                         "apply_migration_fix",
+-                        "get_artifact",
++                        "init_update_launcher",
+                         "get_os",
+                         "should_disable_mouseover",
+                         "highlight_in_folder",
+diff --git a/apps/app/src/api/utils.rs b/apps/app/src/api/utils.rs
+index 452079157..951affa63 100644
+--- a/apps/app/src/api/utils.rs
++++ b/apps/app/src/api/utils.rs
+@@ -10,14 +10,15 @@ use crate::api::{Result, TheseusSerializableError};
+ use dashmap::DashMap;
+ use std::path::{Path, PathBuf};
+ use theseus::prelude::canonicalize;
+-use url::Url;
+ use theseus::util::utils;
++use url::Url;
+ 
+ pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
+     tauri::plugin::Builder::new("utils")
+         .invoke_handler(tauri::generate_handler![
++            init_authlib_patching,
+             apply_migration_fix,
+-            get_artifact,
++            init_update_launcher,
+             get_os,
+             should_disable_mouseover,
+             highlight_in_folder,
+@@ -29,6 +30,17 @@ pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
+         .build()
+ }
+ 
++/// [AR] Feature
++#[tauri::command]
++pub async fn init_authlib_patching(
++    minecraftversion: &str,
++    ismojang: bool,
++) -> Result<bool> {
++    let result =
++        utils::init_authlib_patching(minecraftversion, ismojang).await?;
++    Ok(result)
++}
++
+ /// [AR] Patch fix
+ #[tauri::command]
+ pub async fn apply_migration_fix(eol: &str) -> Result<bool> {
+@@ -38,8 +50,19 @@ pub async fn apply_migration_fix(eol: &str) -> Result<bool> {
+ 
+ /// [AR] Feature
+ #[tauri::command]
+-pub async fn get_artifact(downloadurl: &str, filename: &str, ostype: &str, autoupdatesupported: bool) -> Result<()> {
+-    let _ = utils::init_download(downloadurl, filename, ostype, autoupdatesupported).await;
++pub async fn init_update_launcher(
++    downloadurl: &str,
++    filename: &str,
++    ostype: &str,
++    autoupdatesupported: bool,
++) -> Result<()> {
++    let _ = utils::init_update_launcher(
++        downloadurl,
++        filename,
++        ostype,
++        autoupdatesupported,
++    )
++    .await;
+     Ok(())
+ }
+ 
+diff --git a/apps/app/tauri.conf.json b/apps/app/tauri.conf.json
+index 4ebb2aa5f..cfc271565 100644
+--- a/apps/app/tauri.conf.json
++++ b/apps/app/tauri.conf.json
+@@ -41,7 +41,7 @@
+     ]
+   },
+   "productName": "AstralRinth App",
+-  "version": "0.10.303",
++  "version": "0.10.304",
+   "mainBinaryName": "AstralRinth App",
+   "identifier": "AstralRinthApp",
+   "plugins": {
+diff --git a/packages/app-lib/src/error.rs b/packages/app-lib/src/error.rs
+index 75c144f55..360984efd 100644
+--- a/packages/app-lib/src/error.rs
++++ b/packages/app-lib/src/error.rs
+@@ -151,6 +151,41 @@ pub enum ErrorKind {
+         "A skin texture must have a dimension of either 64x64 or 64x32 pixels"
+     )]
+     InvalidSkinTexture,
++
++    #[error(
++        "[AR] Target minecraft {minecraft_version} version doesn't exist."
++    )]
++    InvalidMinecraftVersion {
++        minecraft_version: String,
++    },
++
++    #[error(
++        "[AR] Target metadata not found for minecraft version {minecraft_version}."
++    )]
++    MinecraftMetadataNotFound {
++        minecraft_version: String,
++    },
++
++    #[error(
++        "[AR] Network error: {error}"
++    )]
++    NetworkErrorOccurred {
++        error: String,
++    },
++
++    #[error(
++        "[AR] IO error: {error}"
++    )]
++    IOErrorOccurred {
++        error: String,
++    },
++
++    #[error(
++        "[AR] Parse error: {reason}"
++    )]
++    ParseError {
++        reason: String,
++    },
+ }
+ 
+ #[derive(Debug)]
+diff --git a/packages/app-lib/src/launcher/mod.rs b/packages/app-lib/src/launcher/mod.rs
+index f1b5deb85..a7d0708e3 100644
+--- a/packages/app-lib/src/launcher/mod.rs
++++ b/packages/app-lib/src/launcher/mod.rs
+@@ -633,6 +633,7 @@ pub async fn launch_minecraft(
+         command.arg("--add-opens=jdk.internal/jdk.internal.misc=ALL-UNNAMED");
+     }
+ 
++    // FIXME: Fix ElyBy integration with this patch.
+     // [AR] Patch
+     if credentials.access_token == "null" && credentials.refresh_token == "null" {
+         if version_jar == "1.16.4" || version_jar == "1.16.5" {
+diff --git a/packages/app-lib/src/util/utils.rs b/packages/app-lib/src/util/utils.rs
+index adebc3a67..e4d9a2ab1 100644
+--- a/packages/app-lib/src/util/utils.rs
++++ b/packages/app-lib/src/util/utils.rs
+@@ -1,12 +1,12 @@
+-///
+-/// [AR] Feature
+-///
+-use crate::Result;
+ use crate::api::update;
+ use crate::state::db;
++///
++/// [AR] Feature Utils
++///
++use crate::{Result, State};
+ use serde::{Deserialize, Serialize};
+ use std::process;
+-use tokio::io;
++use tokio::{fs, io};
+ 
+ const PACKAGE_JSON_CONTENT: &str =
+     // include_str!("../../../../apps/app-frontend/package.json");
+@@ -17,13 +17,311 @@ pub struct Launcher {
+     pub version: String,
+ }
+ 
++#[derive(Debug, Deserialize)]
++struct Artifact {
++    path: Option<String>,
++    sha1: Option<String>,
++    url: Option<String>,
++}
++
++#[derive(Debug, Deserialize)]
++struct Downloads {
++    artifact: Option<Artifact>,
++}
++
++#[derive(Debug, Deserialize)]
++struct Library {
++    name: String,
++    downloads: Option<Downloads>,
++}
++
++#[derive(Debug, Deserialize)]
++struct VersionJson {
++    libraries: Vec<Library>,
++}
++
++/// Deserialize the content of package.json into a Launcher struct
+ pub fn read_package_json() -> io::Result<Launcher> {
+-    // Deserialize the content of package.json into a Launcher struct
+     let launcher: Launcher = serde_json::from_str(PACKAGE_JSON_CONTENT)?;
+-
+     Ok(launcher)
+ }
+ 
++/// ### AR • Universal Write (IO) Function
++/// Saves the downloaded bytes to the `libraries` directory using the given relative path.
++async fn write_file_to_libraries(
++    relative_path: &str,
++    bytes: &bytes::Bytes,
++) -> Result<()> {
++    let state = State::get().await?;
++    let output_path = state.directories.libraries_dir().join(relative_path);
++
++    fs::write(&output_path, bytes).await.map_err(|e| {
++        tracing::error!("[AR] • Failed to save file: {:?}", e);
++        crate::ErrorKind::IOErrorOccurred {
++            error: format!("Failed to save file: {e}"),
++        }
++        .as_error()
++    })
++}
++
++/// ### AR • AuthLib (Ely By)
++/// Initializes the AuthLib patching process.
++///
++/// Returns `true` if the authlib patched successfully.
++pub async fn init_authlib_patching(
++    minecraft_version: &str,
++    is_mojang: bool,
++) -> Result<bool> {
++    let minecraft_library_metadata = get_minecraft_library_metadata(minecraft_version).await?;
++    // Parses the AuthLib version from string
++    // Example output: "com.mojang:authlib:6.0.58" -> "6.0.58"
++    let authlib_version = minecraft_library_metadata.name.split(':').nth(2).unwrap_or("unknown");
++    
++    tracing::info!(
++        "[AR] • Attempting to download AuthLib {}.",
++        authlib_version
++    );
++
++    download_authlib(
++        &minecraft_library_metadata,
++        authlib_version,
++        minecraft_version,
++        is_mojang,
++    )
++    .await
++}
++
++/// ### AR • AuthLib (Ely By)
++/// Downloads the AuthLib file from Mojang libraries or Git Astralium services.
++async fn download_authlib(
++    minecraft_library_metadata: &Library,
++    authlib_version: &str,
++    minecraft_version: &str,
++    is_mojang: bool,
++) -> Result<bool> {
++    let state = State::get().await?;
++    let (url, path) = extract_download_info(minecraft_library_metadata, minecraft_version)?;
++    let mut download_url = url.to_string();
++    let full_path = state.directories.libraries_dir().join(path);
++
++    if !is_mojang {
++        tracing::info!(
++            "[AR] • Attempting to download AuthLib from Git Astralium"
++        );
++        download_url = extract_ely_authlib_url(authlib_version).await?;
++    }
++    tracing::info!("[AR] • Downloading AuthLib from URL: {}", download_url);
++    let bytes = fetch_bytes_from_url(&download_url).await?;
++    tracing::info!("[AR] • Will save to path: {}", full_path.to_str().unwrap());
++    write_file_to_libraries(full_path.to_str().unwrap(), &bytes).await?;
++    tracing::info!("[AR] • Successfully saved AuthLib to {:?}", full_path);
++    Ok(true)
++}
++
++/// ### AR • AuthLib (Ely By)
++/// Parses the ElyIntegration release JSON and returns the download URL for the given AuthLib version.
++async fn extract_ely_authlib_url(authlib_version: &str) -> Result<String> {
++    let url = "https://git.astralium.su/api/v1/repos/didirus/ElyIntegration/releases/latest";
++
++    let response = reqwest::get(url).await.map_err(|e| {
++        tracing::error!(
++            "[AR] • Failed to fetch ElyIntegration release JSON: {:?}",
++            e
++        );
++        crate::ErrorKind::NetworkErrorOccurred {
++            error: format!("Failed to fetch ElyIntegration release JSON: {}", e),
++        }
++        .as_error()
++    })?;
++
++    let json: serde_json::Value = response.json().await.map_err(|e| {
++        tracing::error!("[AR] • Failed to parse ElyIntegration JSON: {:?}", e);
++        crate::ErrorKind::ParseError {
++            reason: format!("Failed to parse ElyIntegration JSON: {}", e),
++        }
++        .as_error()
++    })?;
++
++    let assets =
++        json.get("assets")
++            .and_then(|v| v.as_array())
++            .ok_or_else(|| {
++                crate::ErrorKind::ParseError {
++                    reason: "Missing 'assets' array".into(),
++                }
++                .as_error()
++            })?;
++
++    let asset = assets
++        .iter()
++        .find(|a| {
++            a.get("name")
++                .and_then(|n| n.as_str())
++                .map(|n| n.contains(authlib_version))
++                .unwrap_or(false)
++        })
++        .ok_or_else(|| {
++            crate::ErrorKind::ParseError {
++                reason: format!(
++                    "No matching asset for authlib-{}.jar",
++                    authlib_version
++                ),
++            }
++            .as_error()
++        })?;
++
++    let download_url = asset
++        .get("browser_download_url")
++        .and_then(|u| u.as_str())
++        .ok_or_else(|| {
++            crate::ErrorKind::ParseError {
++                reason: "Missing 'browser_download_url'".into(),
++            }
++            .as_error()
++        })?;
++
++    Ok(download_url.to_string())
++}
++
++/// ### AR • AuthLib (Ely By)
++/// Extracts the artifact URL and Path from the library structure.
++///
++/// Returns a tuple of references to the URL and path strings,
++/// or an error if the required metadata is missing.
++fn extract_download_info<'a>(
++    minecraft_library_metadata: &'a Library,
++    minecraft_version: &str,
++) -> Result<(&'a str, &'a str)> {
++    let artifact = minecraft_library_metadata
++        .downloads
++        .as_ref()
++        .and_then(|d| d.artifact.as_ref())
++        .ok_or_else(|| {
++            crate::ErrorKind::MinecraftMetadataNotFound {
++                minecraft_version: minecraft_version.to_string(),
++            }
++            .as_error()
++        })?;
++
++    let url = artifact.url.as_deref().ok_or_else(|| {
++        crate::ErrorKind::MinecraftMetadataNotFound {
++            minecraft_version: minecraft_version.to_string(),
++        }
++        .as_error()
++    })?;
++
++    let path = artifact.path.as_deref().ok_or_else(|| {
++        crate::ErrorKind::MinecraftMetadataNotFound {
++            minecraft_version: minecraft_version.to_string(),
++        }
++        .as_error()
++    })?;
++
++    Ok((url, path))
++}
++
++/// ### AR • AuthLib (Ely By)
++/// Downloads bytes from the provided URL with a 15 second timeout.
++async fn fetch_bytes_from_url(url: &str) -> Result<bytes::Bytes> {
++    // Create client instance with request timeout.
++    let client = reqwest::Client::new();
++    const TIMEOUT_SECONDS: u64 = 15;
++
++    let response = tokio::time::timeout(
++        std::time::Duration::from_secs(TIMEOUT_SECONDS),
++        client.get(url).send(),
++    )
++    .await
++    .map_err(|_| {
++        tracing::error!("[AR] • Download timed out after {} seconds", TIMEOUT_SECONDS);
++        crate::ErrorKind::NetworkErrorOccurred {
++            error: format!("Download timed out after {TIMEOUT_SECONDS} seconds").to_string(),
++        }
++        .as_error()
++    })?
++    .map_err(|e| {
++        tracing::error!("[AR] • Request error: {:?}", e);
++        crate::ErrorKind::NetworkErrorOccurred {
++            error: format!("Request error: {e}"),
++        }
++        .as_error()
++    })?;
++
++    if !response.status().is_success() {
++        let status = response.status().to_string();
++        tracing::error!("[AR] • Failed to download authlib: HTTP {}", status);
++        return Err(crate::ErrorKind::NetworkErrorOccurred {
++            error: format!("Failed to download authlib: HTTP {status}"),
++        }
++        .as_error());
++    }
++
++    response.bytes().await.map_err(|e| {
++        tracing::error!("[AR] • Failed to read response bytes: {:?}", e);
++        crate::ErrorKind::NetworkErrorOccurred {
++            error: format!("Failed to read response bytes: {e}"),
++        }
++        .as_error()
++    })
++}
++
++/// ### AR • AuthLib (Ely By)
++/// Gets the Minecraft library metadata from the local libraries directory.
++async fn get_minecraft_library_metadata(minecraft_version: &str) -> Result<Library> {
++    let state = State::get().await?;
++
++    let path = state
++        .directories
++        .version_dir(minecraft_version)
++        .join(format!("{}.json", minecraft_version));
++    if !path.exists() {
++        tracing::error!("[AR] • File not found: {:#?}", path);
++        return Err(crate::ErrorKind::InvalidMinecraftVersion {
++            minecraft_version: minecraft_version.to_string(),
++        }
++        .as_error());
++    }
++
++    let content = fs::read_to_string(&path).await?;
++    let version_data: VersionJson = serde_json::from_str(&content)?;
++
++    for lib in version_data.libraries {
++        if lib.name.contains("com.mojang:authlib") {
++            if let Some(downloads) = &lib.downloads {
++                if let Some(artifact) = &downloads.artifact {
++                    if artifact.path.is_some()
++                        && artifact.url.is_some()
++                        && artifact.sha1.is_some()
++                    {
++                        tracing::info!("[AR] • Found AuthLib: {}", lib.name);
++                        tracing::info!(
++                            "[AR] • Path: {}",
++                            artifact.path.as_ref().unwrap()
++                        );
++                        tracing::info!(
++                            "[AR] • URL: {}",
++                            artifact.url.as_ref().unwrap()
++                        );
++                        tracing::info!(
++                            "[AR] • SHA1: {}",
++                            artifact.sha1.as_ref().unwrap()
++                        );
++
++                        return Ok(lib);
++                    }
++                }
++            }
++        }
++    }
++
++    Err(crate::ErrorKind::MinecraftMetadataNotFound {
++        minecraft_version: minecraft_version.to_string(),
++    }
++    .as_error())
++}
++
++/// ### AR • Migration
++/// Applying migration fix for SQLite database.
+ pub async fn apply_migration_fix(eol: &str) -> Result<bool> {
+     tracing::info!("[AR] • Attempting to apply migration fix");
+     let patched = db::apply_migration_fix(eol).await?;
+@@ -35,14 +333,19 @@ pub async fn apply_migration_fix(eol: &str) -> Result<bool> {
+     Ok(patched)
+ }
+ 
+-pub async fn init_download(
++/// ### AR • Updater
++/// Initialize the update launcher.
++pub async fn init_update_launcher(
+     download_url: &str,
+     local_filename: &str,
+     os_type: &str,
+     auto_update_supported: bool,
+ ) -> Result<()> {
+-    println!("[AR] • Initialize downloading from • {:?}", download_url);
+-    println!("[AR] • Save local file name • {:?}", local_filename);
++    tracing::info!("[AR] • Initialize downloading from • {:?}", download_url);
++    tracing::info!("[AR] • Save local file name • {:?}", local_filename);
++    tracing::info!("[AR] • OS type • {}", os_type);
++    tracing::info!("[AR] • Auto update supported • {}", auto_update_supported);
++
+     if let Err(e) = update::get_resource(
+         download_url,
+         local_filename,