Add sha256sum check for update downloads

src/app/page.tsx

@@ -66,11 +66,15 @@ export default function Home () {
         if (!launcherUpdateData) return
         const downloadResult = await invoke('download', {
           url: getDownloadLink(launcherUpdateData),
-          name: launcherLatestRequest.data
+          name: launcherLatestRequest.data,
+          hash: getDownloadHash(launcherUpdateData)
         })
-        if (downloadResult !== '1') {
+        if (downloadResult == '-1') {
           setState('Failed. Check internet connection.')
           return
+        } else if (downloadResult == '-2') {
+          setState('File integrity check failed.')
+          return
         }
         setState('Starting...')
       }
@@ -101,6 +105,26 @@ export default function Home () {
     return undefined
   }
 
+  function getDownloadHash (version: LauncherUpdate): string | undefined {
+    const p = platform()
+    const a = arch()
+
+    const findUrl = (plat: string) => {
+      const i = version.platforms.indexOf(plat)
+      return i >= 0 ? version.sha256sums[i] : undefined
+    }
+
+    if (p === 'windows') {
+      if (a === 'x86_64') return findUrl('windows-x64')
+      if (a === 'aarch64') return findUrl('windows-arm64')
+    } else if (p === 'macos') {
+      if (a === 'x86_64') return findUrl('macos-intel')
+      if (a === 'aarch64') return findUrl('macos-silicon')
+    } else if (p === 'linux') return findUrl(p)
+
+    return undefined
+  }
+
   return (
     <>
       <div className='absolute left-1/2 top-[20%] -translate-x-1/2 flex flex-col items-center'>

src/app/types/LauncherUpdate.ts

@@ -3,5 +3,5 @@ export interface LauncherUpdate {
     releaseDate: number
     downloadUrls: string[]
     platforms: string[]
-    executables: string[]
+    sha256sums: string[]
 }