feat: Implement token service for managing GitHub and Copilot tokens

Author: ericc-ch

src/lib/token.ts

@@ -0,0 +1,65 @@
+import consola from "consola"
+import fs from "node:fs/promises"
+
+import { PATHS } from "~/lib/paths"
+import { getCopilotToken } from "~/services/copilot/get-token/copilot-token"
+
+// Simple token manager with basic encapsulation
+export const tokenService = {
+  // Private token storage
+  _tokens: {
+    github: undefined as string | undefined,
+    copilot: undefined as string | undefined,
+  },
+
+  // Get GitHub token
+  async getGithubToken(): Promise<string | undefined> {
+    if (!this._tokens.github) {
+      try {
+        this._tokens.github = await fs.readFile(
+          PATHS.GITHUB_TOKEN_PATH,
+          "utf-8",
+        )
+      } catch (error) {
+        consola.warn("Failed to load GitHub token", error)
+      }
+    }
+
+    return this._tokens.github
+  },
+
+  // Set GitHub token
+  async setGithubToken(token: string): Promise<void> {
+    this._tokens.github = token
+    await fs.writeFile(PATHS.GITHUB_TOKEN_PATH, token)
+  },
+
+  // Get Copilot token
+  getCopilotToken(): string | undefined {
+    return this._tokens.copilot
+  },
+
+  // Set Copilot token
+  setCopilotToken(token: string): void {
+    this._tokens.copilot = token
+  },
+
+  // Initialize Copilot token with auto-refresh
+  async initCopilotToken(): Promise<void> {
+    const { token, refresh_in } = await getCopilotToken()
+    this.setCopilotToken(token)
+
+    // Set up refresh timer
+    const refreshInterval = (refresh_in - 60) * 1000
+    setInterval(async () => {
+      consola.start("Refreshing Copilot token")
+      try {
+        const { token: newToken } = await getCopilotToken()
+        this.setCopilotToken(newToken)
+        consola.success("Copilot token refreshed")
+      } catch (error) {
+        consola.error("Failed to refresh Copilot token:", error)
+      }
+    }, refreshInterval)
+  },
+}