From f65f982b1ce760a9a180c4ab07055c45cb37b5c2 Mon Sep 17 00:00:00 2001
From: Patrik Oldsberg <poldsberg@gmail.com>
Date: Tue, 16 Jun 2020 17:26:49 +0200
Subject: [PATCH] packages/core: added google sign-in provider

---
 .../src/layout/SignInPage/googleProvider.tsx  | 86 +++++++++++++++++++
 .../core/src/layout/SignInPage/providers.tsx  |  4 +-
 2 files changed, 89 insertions(+), 1 deletion(-)
 create mode 100644 packages/core/src/layout/SignInPage/googleProvider.tsx

diff --git a/packages/core/src/layout/SignInPage/googleProvider.tsx b/packages/core/src/layout/SignInPage/googleProvider.tsx
new file mode 100644
index 0000000000..2db7e2fd53
--- /dev/null
+++ b/packages/core/src/layout/SignInPage/googleProvider.tsx
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import React from 'react';
+import { Grid, Typography, Button } from '@material-ui/core';
+import { InfoCard } from '../InfoCard/InfoCard';
+import { ProviderComponent, ProviderLoader, SignInProvider } from './types';
+import {
+  useApi,
+  googleAuthApiRef,
+  errorApiRef,
+  ProfileInfo,
+} from '@backstage/core-api';
+
+function parseUserId(profile: ProfileInfo) {
+  return profile!.email.replace(/@.*/, '');
+}
+
+const Component: ProviderComponent = ({ onResult }) => {
+  const googleAuthApi = useApi(googleAuthApiRef);
+  const errorApi = useApi(errorApiRef);
+
+  const handleLogin = async () => {
+    try {
+      const idToken = await googleAuthApi.getIdToken({ instantPopup: true });
+      const profile = await googleAuthApi.getProfile();
+
+      onResult({
+        userId: parseUserId(profile!),
+        idToken,
+        logout: async () => {
+          await googleAuthApi.logout();
+        },
+      });
+    } catch (error) {
+      errorApi.post(error);
+    }
+  };
+
+  return (
+    <Grid item>
+      <InfoCard
+        title="Google"
+        actions={
+          <Button color="primary" variant="outlined" onClick={handleLogin}>
+            Sign In
+          </Button>
+        }
+      >
+        <Typography variant="body1">Sign In using Google</Typography>
+      </InfoCard>
+    </Grid>
+  );
+};
+
+const loader: ProviderLoader = async apis => {
+  const googleAuthApi = apis.get(googleAuthApiRef)!;
+
+  const [idToken, profile] = await Promise.all([
+    googleAuthApi.getIdToken({ optional: true }),
+    googleAuthApi.getProfile({ optional: true }),
+  ]);
+
+  return {
+    userId: parseUserId(profile!),
+    idToken,
+    logout: async () => {
+      await googleAuthApi.logout();
+    },
+  };
+};
+
+export const googleProvider: SignInProvider = { Component, loader };
diff --git a/packages/core/src/layout/SignInPage/providers.tsx b/packages/core/src/layout/SignInPage/providers.tsx
index 10fb09d082..8e5cc7fc54 100644
--- a/packages/core/src/layout/SignInPage/providers.tsx
+++ b/packages/core/src/layout/SignInPage/providers.tsx
@@ -16,6 +16,7 @@
 
 import React, { useLayoutEffect, useState, useMemo, useCallback } from 'react';
 import { guestProvider } from './guestProvider';
+import { googleProvider } from './googleProvider';
 import {
   SignInPageProps,
   SignInResult,
@@ -28,10 +29,11 @@ import { SignInProvider } from './types';
 const PROVIDER_STORAGE_KEY = '@backstage/core:SignInPage:provider';
 
 // Separate list here to avoid exporting internal types
-export type SignInProviderId = 'guest';
+export type SignInProviderId = 'guest' | 'google';
 
 const signInProviders: { [id in SignInProviderId]: SignInProvider } = {
   guest: guestProvider,
+  google: googleProvider,
 };
 
 export const useSignInProviders = (