expose the permission plugin using the new backend system

Signed-off-by: eipc16 <pprzemek.312@gmail.com>

plugins/permission-backend/alpha-api-report.md

@@ -0,0 +1,20 @@
+## API Report File for "@backstage/plugin-permission-backend"
+
+> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
+
+```ts
+import { BackendFeature } from '@backstage/backend-plugin-api';
+import { PermissionPolicy } from '@backstage/plugin-permission-node';
+
+// @alpha
+export const permissionPlugin: (
+  options: PermissionPluginOptions,
+) => BackendFeature;
+
+// @alpha
+export type PermissionPluginOptions = {
+  policy: PermissionPolicy;
+};
+
+// (No @packageDocumentation comment for this package)
+```

plugins/permission-backend/package.json

@@ -9,6 +9,21 @@
     "main": "dist/index.cjs.js",
     "types": "dist/index.d.ts"
   },
+  "exports": {
+    ".": "./src/index.ts",
+    "./alpha": "./src/alpha.ts",
+    "./package.json": "./package.json"
+  },
+  "typesVersions": {
+    "*": {
+      "alpha": [
+        "src/alpha.ts"
+      ],
+      "package.json": [
+        "package.json"
+      ]
+    }
+  },
   "backstage": {
     "role": "backend-plugin"
   },
@@ -23,6 +38,7 @@
   },
   "dependencies": {
     "@backstage/backend-common": "workspace:^",
+    "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/config": "workspace:^",
     "@backstage/errors": "workspace:^",
     "@backstage/plugin-auth-node": "workspace:^",

plugins/permission-backend/src/alpha.ts

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2020 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.
+ */
+
+export { permissionPlugin, type PermissionPluginOptions } from './plugin';

plugins/permission-backend/src/plugin.ts

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2021 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 { loggerToWinstonLogger } from '@backstage/backend-common';
+import {
+  coreServices,
+  createBackendPlugin,
+} from '@backstage/backend-plugin-api';
+import { PermissionPolicy } from '@backstage/plugin-permission-node';
+import { createRouter } from './service';
+
+/**
+ * Permission plugin options
+ *
+ * @alpha
+ */
+export type PermissionPluginOptions = {
+  policy: PermissionPolicy;
+};
+
+/**
+ * Permission plugin
+ *
+ * @alpha
+ */
+export const permissionPlugin = createBackendPlugin(
+  (options: PermissionPluginOptions) => ({
+    pluginId: 'permission',
+    register(env) {
+      env.registerInit({
+        deps: {
+          http: coreServices.httpRouter,
+          config: coreServices.config,
+          logger: coreServices.logger,
+          discovery: coreServices.discovery,
+          identity: coreServices.identity,
+        },
+        async init({ http, config, logger, discovery, identity }) {
+          const winstonLogger = loggerToWinstonLogger(logger);
+          http.use(
+            await createRouter({
+              config,
+              discovery,
+              identity,
+              logger: winstonLogger,
+              policy: options.policy,
+            }),
+          );
+        },
+      });
+    },
+  }),
+);