feat(api-server): remote control api (#1909)

Co-authored-by: JellyBrick <shlee1503@naver.com>
Co-authored-by: Angelos Bouklis <angelbouklis.official@gmail.com>
Co-authored-by: Angelos Bouklis <me@arjix.dev>
Co-authored-by: Angelos Bouklis <53124886+ArjixWasTaken@users.noreply.github.com>

src/plugins/api-server/backend/main.ts

@@ -0,0 +1,99 @@
+import { jwt } from 'hono/jwt';
+import { OpenAPIHono as Hono } from '@hono/zod-openapi';
+import { cors } from 'hono/cors';
+import { swaggerUI } from '@hono/swagger-ui';
+import { serve } from '@hono/node-server';
+
+import registerCallback from '@/providers/song-info';
+import { createBackend } from '@/utils';
+
+import { JWTPayloadSchema } from './scheme';
+import { registerAuth, registerControl } from './routes';
+
+import type { APIServerConfig } from '../config';
+import type { BackendType } from './types';
+
+export const backend = createBackend<BackendType, APIServerConfig>({
+  async start(ctx) {
+    const config = await ctx.getConfig();
+
+    this.init(ctx);
+    registerCallback((songInfo) => {
+      this.songInfo = songInfo;
+    });
+
+    this.run(config.hostname, config.port);
+  },
+  stop() {
+    this.end();
+  },
+  onConfigChange(config) {
+    if (this.oldConfig?.hostname === config.hostname && this.oldConfig?.port === config.port) {
+      this.oldConfig = config;
+      return;
+    }
+
+    this.end();
+    this.run(config.hostname, config.port);
+    this.oldConfig = config;
+  },
+
+  // Custom
+  async init(ctx) {
+    const config = await ctx.getConfig();
+    this.app = new Hono();
+
+    this.app.use('*', cors());
+
+    // middlewares
+    this.app.use(
+      '/api/*',
+      jwt({
+        secret: config.secret,
+      }),
+    );
+    this.app.use('/api/*', async (ctx, next) => {
+      const result = await JWTPayloadSchema.spa(await ctx.get('jwtPayload'));
+
+      const isAuthorized = result.success && config.authorizedClients.includes(result.data.id);
+      if (!isAuthorized) {
+        ctx.status(401);
+        return ctx.body('Unauthorized');
+      }
+
+      return await next();
+    });
+
+    // routes
+    registerControl(this.app, ctx, () => this.songInfo);
+    registerAuth(this.app, ctx);
+
+    // swagger
+    this.app.doc('/doc', {
+      openapi: '3.1.0',
+      info: {
+        version: '1.0.0',
+        title: 'Youtube Music API Server',
+      },
+    });
+
+    this.app.get('/swagger', swaggerUI({ url: '/doc' }));
+  },
+  run(hostname, port) {
+    if (!this.app) return;
+
+    try {
+      this.server = serve({
+        fetch: this.app.fetch.bind(this.app),
+        port,
+        hostname,
+      });
+    } catch (err) {
+      console.error(err);
+    }
+  },
+  end() {
+    this.server?.close();
+    this.server = undefined;
+  },
+});