auth-backend: added common email local-part sign-in resolver

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/auth-backend/src/providers/resolvers.ts

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2022 The Backstage Authors
+ *
+ * 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 {
+  DEFAULT_NAMESPACE,
+  stringifyEntityRef,
+} from '@backstage/catalog-model';
+import { SignInResolver } from './types';
+
+export const commonEmailLocalPartEntityNameSignInResolver: SignInResolver<
+  unknown
+> = async (info, ctx) => {
+  const { profile } = info;
+
+  if (!profile.email) {
+    throw new Error('Login failed, user profile does not contain an email');
+  }
+  const [userId] = profile.email.split('@');
+
+  const entityRef = stringifyEntityRef({
+    kind: 'User',
+    namespace: DEFAULT_NAMESPACE,
+    name: userId,
+  });
+  const ownershipEntityRefs =
+    await ctx.catalogIdentityClient.resolveCatalogMembership({
+      entityRefs: [entityRef],
+    });
+  const token = await ctx.tokenIssuer.issueToken({
+    claims: {
+      sub: entityRef,
+      ent: ownershipEntityRefs,
+    },
+  });
+
+  return { id: userId, token };
+};