feat: add GitHub OAuth proxy endpoint at /auth/github

server.ts

@@ -11,11 +11,51 @@ import { log } from "./src/log.ts";
 const router = new Router();
 
 const PAGINATION = 20;
+const GITHUB_CLIENT_ID = Deno.env.get("GITHUB_CLIENT_ID") ?? "";
+const GITHUB_CLIENT_SECRET = Deno.env.get("GITHUB_CLIENT_SECRET") ?? "";
 
 router.get("/", (ctx) => {
   ctx.response.body = "Hello world";
 });
 
+router.get("/auth/github", async (ctx) => {
+  const code = ctx.request.url.searchParams.get("code");
+  const type = ctx.request.url.searchParams.get("type");
+
+  if (!code) {
+    ctx.response.status = 400;
+    ctx.response.body = { error: "code is required" };
+    return;
+  }
+
+  const params: Record<string, string> = {
+    client_id: GITHUB_CLIENT_ID,
+    client_secret: GITHUB_CLIENT_SECRET,
+  };
+
+  if (type === "refresh") {
+    params.grant_type = "refresh_token";
+    params.refresh_token = code;
+  } else {
+    params.code = code;
+  }
+
+  const response = await fetch(
+    "https://github.com/login/oauth/access_token",
+    {
+      method: "POST",
+      headers: {
+        "Accept": "application/json",
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify(params),
+    },
+  );
+
+  ctx.response.status = response.status;
+  ctx.response.body = await response.json();
+});
+
 router.get("/health", (ctx) => {
   ctx.response.body = { status: "ok" };
 });