Add static json adapter to serve user groups

plugins/identity-backend/src/adapters/StaticJsonAdapter.ts

@@ -0,0 +1,87 @@
+/*
+ * 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 { Group, GroupsJson, GroupsResponse, IdentityApiAdapter } from './types';
+import fs from 'fs-extra';
+import express from 'express';
+import path from 'path';
+
+const GROUPS_JSON_FILE = path.join(__dirname, 'data', 'userGroups.json');
+
+export class StaticJsonAdapter implements IdentityApiAdapter {
+  private readonly groups: Group[];
+
+  constructor() {
+    const groupsJson: GroupsJson = fs.readJsonSync(GROUPS_JSON_FILE, {
+      encoding: 'utf8',
+    });
+    this.groups = groupsJson.groups;
+  }
+
+  getUserGroups(
+    req: express.Request,
+    res: express.Response,
+  ): express.Response<GroupsResponse> {
+    const user = req.params.user;
+    const type = req.query.type?.toString() ?? '';
+
+    const userGroups = this._getUserGroups(this.groups, user);
+    const groups = this.filterGroupsByType(userGroups, type);
+    return res.json({ groups });
+  }
+
+  _getUserGroups(groups: Group[], user: string) {
+    const userGroups: Set<Group> = new Set();
+    groups.forEach(group => {
+      if (this.isUserInGroup(group, user)) {
+        userGroups.add(group);
+      }
+
+      if (group.children) {
+        const userSubGroups = this._getUserGroups(group.children, user) ?? [];
+        const isUserInSubGroup = Boolean(userSubGroups.length);
+        if (isUserInSubGroup) {
+          userGroups.add(group);
+        }
+        userSubGroups.forEach(subGroup => userGroups.add(subGroup));
+      }
+    });
+    return Array.from(userGroups);
+  }
+
+  private filterGroupsByType = (userGroups: Group[], type: string) => {
+    const groups = type
+      ? userGroups
+          .filter((group: Group) => group.type === type)
+          .map(group => ({ name: group.name, type: group.type }))
+      : userGroups.map(group => ({
+          name: group.name,
+          type: group.type,
+        }));
+    return groups;
+  };
+
+  private isUserInGroup = (group: Group, user: string): boolean => {
+    if (group.members) {
+      const groupMembers = group.members;
+      const groupsWithUser = groupMembers.filter(
+        member => member.name === user,
+      );
+      return Boolean(groupsWithUser.length);
+    }
+    return false;
+  };
+}

plugins/identity-backend/src/adapters/data/userGroups.json

@@ -0,0 +1,20 @@
+{
+  "groups": [
+    {
+      "name": "engineering",
+      "type": "org",
+      "children": [
+        {
+          "name": "authentication",
+          "type": "team",
+          "members": [{ "name": "kent" }, { "name": "dobbs" }]
+        },
+        {
+          "name": "checkout",
+          "type": "team",
+          "members": [{ "name": "don" }, { "name": "abramev" }]
+        }
+      ]
+    }
+  ]
+}

plugins/identity-backend/src/adapters/index.ts

@@ -0,0 +1,17 @@
+/*
+ * 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.
+ */
+
+export * from './StaticJsonAdapter';

plugins/identity-backend/src/adapters/types.ts

@@ -0,0 +1,43 @@
+/*
+ * 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 express from 'express';
+
+export type User = {
+  name: string;
+};
+
+export type Group = {
+  name: string;
+  type: string;
+  members?: User[];
+  children?: Group[];
+};
+
+export type GroupsJson = {
+  groups: Group[];
+};
+
+export type GroupsResponse = {
+  groups: Group[];
+};
+
+export interface IdentityApiAdapter {
+  getUserGroups(
+    req: express.Request,
+    res: express.Response,
+  ): express.Response<GroupsResponse>;
+}

plugins/identity-backend/src/service/router.ts

@@ -17,21 +17,25 @@
 import express from 'express';
 import Router from 'express-promise-router';
 import { Logger } from 'winston';
+import { StaticJsonAdapter } from '../adapters';
+import { IdentityApiAdapter } from '../adapters/types';
 
 export interface RouterOptions {
   logger: Logger;
 }
 
+const makeRouter = (adapter: IdentityApiAdapter): express.Router => {
+  const router = Router();
+  router.get('/users/:user/groups', adapter.getUserGroups.bind(adapter));
+  return router;
+};
+
 export async function createRouter(
   options: RouterOptions,
 ): Promise<express.Router> {
-  const router = Router();
   const logger = options.logger;
 
-  router.use('/ping', (_, res) => {
-    logger.info('heartbeat for identity service');
-    res.send('pong');
-  });
-
-  return router;
+  logger.info('Initializing identity provider');
+  const adapter = new StaticJsonAdapter();
+  return makeRouter(adapter);
 }