feat: add .auth/login/{provider}/callback rule

identity_auth_login_provider_callback/function.json

@@ -0,0 +1,19 @@
+{
+  "bindings": [
+    {
+      "authLevel": "function",
+      "type": "httpTrigger",
+      "direction": "in",
+      "name": "req",
+      "methods": [
+        "get"
+      ],
+      "route": ".auth/login/{provider}/callback"
+    },
+    {
+      "type": "http",
+      "direction": "out",
+      "name": "res"
+    }
+  ]
+}

identity_auth_login_provider_callback/index.js

@@ -0,0 +1,52 @@
+const { response } = require("../utils");
+const { default: fetch } = require("node-fetch");
+
+module.exports = async function (context, req) {
+  let { state, code } = req.query;
+
+  state = decodeURIComponent(state);
+
+  const client_id = process.env.GITHUB_CLIENT_ID;
+  const client_secret = process.env.GITHUB_CLIENT_SECRET;
+  const oauthUri = `https://github.com/login/oauth/access_token?client_id=${client_id}&client_secret=${client_secret}&code=${code}&state=${state}`;
+  const githubOauthResponse = await fetch(oauthUri, {
+    method: "POST",
+    headers: {
+      accept: "application/json",
+    },
+  });
+
+  const token = await githubOauthResponse.json();
+
+  const location = "http://localhost:4242/.auth/login/done";
+  context.res = response({
+    context,
+    status: 302,
+    cookies: [
+      {
+        name: "Nonce",
+        value: "deleted",
+        path: "/",
+        expires: new Date('Thu, 01 Jan 1970 00:00:00 GMT'),
+      },
+      {
+        name: "RedirectCount",
+        value: "deleted",
+        path: "/",
+        expires: new Date('Thu, 01 Jan 1970 00:00:00 GMT'),
+      },
+      {
+        name: "AppServiceAuthSession",
+        value: "UUUUU",
+        path: "/",
+        secure: true,
+        HttpOnly: true,
+        SameSite: "None",
+      },
+    ],
+    headers: {
+      location,
+      token
+    },
+  });
+};