优化更新失败时的提示语

修复检查更新按钮点击后有重影

src/lib/updater.ts

@@ -7,6 +7,18 @@ export interface AppUpdateCheckResult {
   update: Update | null
 }
 
+export type AppUpdateErrorKind =
+  | "source_unreachable"
+  | "network"
+  | "download_failed"
+  | "install_failed"
+  | "unknown"
+
+export interface AppUpdateErrorInfo {
+  kind: AppUpdateErrorKind
+  rawMessage: string
+}
+
 export async function getCurrentAppVersion(): Promise<string> {
   return getVersion()
 }
@@ -27,3 +39,49 @@ export async function relaunchApp(): Promise<void> {
 export async function closeAppUpdate(update: Update): Promise<void> {
   await update.close()
 }
+
+function toErrorMessage(error: unknown): string {
+  if (error instanceof Error) return error.message
+  return String(error)
+}
+
+export function normalizeAppUpdateError(error: unknown): AppUpdateErrorInfo {
+  const rawMessage = toErrorMessage(error)
+  const normalized = rawMessage.toLowerCase()
+
+  if (
+    normalized.includes("latest.json") ||
+    normalized.includes("/releases/latest/download/")
+  ) {
+    return { kind: "source_unreachable", rawMessage }
+  }
+
+  if (
+    normalized.includes("error sending request for url") ||
+    normalized.includes("failed to send request") ||
+    normalized.includes("network") ||
+    normalized.includes("timed out") ||
+    normalized.includes("dns") ||
+    normalized.includes("connection refused")
+  ) {
+    return { kind: "network", rawMessage }
+  }
+
+  if (
+    normalized.includes("download") ||
+    normalized.includes("checksum") ||
+    normalized.includes("content-length")
+  ) {
+    return { kind: "download_failed", rawMessage }
+  }
+
+  if (
+    normalized.includes("install") ||
+    normalized.includes("installer") ||
+    normalized.includes("permission denied")
+  ) {
+    return { kind: "install_failed", rawMessage }
+  }
+
+  return { kind: "unknown", rawMessage }
+}