feat: add GitHub service for PAT validation, forking, and PR management

packages/backend/src/routes/github.ts

@@ -0,0 +1,116 @@
+import { Router } from "express";
+import { readConfig, writeConfig } from "../services/workspace.service.js";
+import { REPOS } from "../config/repos.js";
+import {
+  validatePat,
+  forkRepo,
+  listUserForks,
+  createPullRequest,
+  listPullRequests,
+} from "../services/github.service.js";
+
+const router = Router();
+
+async function getPat(): Promise<string> {
+  const config = await readConfig();
+  const pat = config.githubPat;
+  if (!pat) throw new Error("GitHub PAT not configured");
+  return pat;
+}
+
+router.post("/validate-pat", async (req, res) => {
+  try {
+    const { pat } = req.body;
+    if (!pat) {
+      res.status(400).json({ error: "PAT is required" });
+      return;
+    }
+    const result = await validatePat(pat);
+
+    const config = await readConfig();
+    await writeConfig({ ...config, githubPat: pat });
+
+    res.json(result);
+  } catch (err: unknown) {
+    const message = err instanceof Error ? err.message : "Invalid PAT";
+    res.status(401).json({ error: message });
+  }
+});
+
+router.post("/fork", async (req, res) => {
+  try {
+    const pat = await getPat();
+    const { repo: repoName } = req.body;
+    const repoDef = REPOS.find((r) => r.name === repoName);
+    if (!repoDef) {
+      res.status(400).json({ error: `Unknown repo: ${repoName}` });
+      return;
+    }
+    const [owner, repo] = repoDef.upstream.split("/");
+    const result = await forkRepo(pat, owner, repo);
+    res.json(result);
+  } catch (err: unknown) {
+    const message = err instanceof Error ? err.message : "Fork failed";
+    res.status(500).json({ error: message });
+  }
+});
+
+router.get("/forks", async (_req, res) => {
+  try {
+    const pat = await getPat();
+    const forks = await listUserForks(pat);
+    res.json(forks);
+  } catch (err: unknown) {
+    const message = err instanceof Error ? err.message : "Failed to list forks";
+    res.status(500).json({ error: message });
+  }
+});
+
+router.post("/pr", async (req, res) => {
+  try {
+    const pat = await getPat();
+    const { repo: repoName, title, body, headBranch } = req.body;
+    const repoDef = REPOS.find((r) => r.name === repoName);
+    if (!repoDef) {
+      res.status(400).json({ error: `Unknown repo: ${repoName}` });
+      return;
+    }
+
+    const { login } = await import("../services/github.service.js").then((m) =>
+      m.validatePat(pat),
+    );
+
+    const result = await createPullRequest(pat, {
+      upstream: repoDef.upstream,
+      repo: repoName,
+      title,
+      body,
+      head: `${login}:${headBranch}`,
+      base: repoDef.branch,
+    });
+    res.json(result);
+  } catch (err: unknown) {
+    const message = err instanceof Error ? err.message : "PR creation failed";
+    res.status(500).json({ error: message });
+  }
+});
+
+router.get("/prs/:repo", async (req, res) => {
+  try {
+    const pat = await getPat();
+    const repoName = req.params.repo;
+    const repoDef = REPOS.find((r) => r.name === repoName);
+    if (!repoDef) {
+      res.status(400).json({ error: `Unknown repo: ${repoName}` });
+      return;
+    }
+    const [owner, repo] = repoDef.upstream.split("/");
+    const prs = await listPullRequests(pat, owner, repo);
+    res.json(prs);
+  } catch (err: unknown) {
+    const message = err instanceof Error ? err.message : "Failed to list PRs";
+    res.status(500).json({ error: message });
+  }
+});
+
+export default router;