feat(backend): initial setup for cms backend service

backend/src/routes/auth.ts

@@ -0,0 +1,164 @@
+import { FastifyPluginAsync } from 'fastify';
+import { z } from 'zod';
+import { db } from '../config/database.js';
+import { users } from '../db/schema.js';
+import { eq } from 'drizzle-orm';
+import { GiteaService } from '../services/gitea.service.js';
+import { env } from '../config/env.js';
+
+const callbackSchema = z.object({
+  code: z.string(),
+  state: z.string(),
+});
+
+const authRoute: FastifyPluginAsync = async (fastify) => {
+  const giteaService = new GiteaService();
+
+  /**
+   * GET /auth/gitea
+   * Initiate OAuth flow
+   */
+  fastify.get('/auth/gitea', async (request, reply) => {
+    // Generate CSRF state token
+    const state = giteaService.generateState();
+
+    // Store state in session
+    request.session.set('oauth_state', state);
+
+    // Generate authorization URL
+    const authUrl = giteaService.getAuthorizationUrl(state);
+
+    // Redirect to Gitea
+    return reply.redirect(authUrl);
+  });
+
+  /**
+   * GET /auth/callback
+   * OAuth callback endpoint
+   */
+  fastify.get('/auth/callback', {
+    schema: {
+      querystring: callbackSchema,
+    },
+  }, async (request, reply) => {
+    try {
+      const { code, state } = request.query as z.infer<typeof callbackSchema>;
+
+      // Verify CSRF state
+      const expectedState = request.session.get('oauth_state');
+      if (!expectedState || state !== expectedState) {
+        return reply.code(400).send({ error: 'Invalid state parameter' });
+      }
+
+      // Clear state from session
+      request.session.delete('oauth_state');
+
+      // Exchange code for access token
+      const tokenResponse = await giteaService.exchangeCodeForToken(code);
+
+      // Fetch user info from Gitea
+      const giteaUser = await giteaService.getUserInfo(tokenResponse.access_token);
+
+      // Check if user is allowed
+      if (!giteaService.isUserAllowed(giteaUser.login)) {
+        return reply.code(403).send({
+          error: 'Access denied. You are not authorized to access this CMS.'
+        });
+      }
+
+      // Find or create user in database
+      let [user] = await db
+        .select()
+        .from(users)
+        .where(eq(users.giteaId, giteaUser.id.toString()))
+        .limit(1);
+
+      if (!user) {
+        // Create new user
+        [user] = await db.insert(users).values({
+          giteaId: giteaUser.id.toString(),
+          giteaUsername: giteaUser.login,
+          giteaEmail: giteaUser.email,
+          displayName: giteaUser.full_name,
+          avatarUrl: giteaUser.avatar_url,
+          lastLogin: new Date(),
+        }).returning();
+      } else {
+        // Update existing user
+        [user] = await db
+          .update(users)
+          .set({
+            giteaUsername: giteaUser.login,
+            giteaEmail: giteaUser.email,
+            displayName: giteaUser.full_name,
+            avatarUrl: giteaUser.avatar_url,
+            lastLogin: new Date(),
+          })
+          .where(eq(users.id, user.id))
+          .returning();
+      }
+
+      // Generate JWT for session management
+      const token = fastify.jwt.sign(
+        {
+          id: user.id,
+          giteaId: user.giteaId,
+          username: user.giteaUsername,
+          role: user.role,
+        },
+        { expiresIn: '24h' }
+      );
+
+      // Redirect to frontend with token
+      const frontendUrl = env.FRONTEND_URL;
+      return reply.redirect(`${frontendUrl}/auth/callback?token=${token}`);
+
+    } catch (error) {
+      fastify.log.error('OAuth callback error:', error);
+      return reply.code(500).send({ error: 'Authentication failed' });
+    }
+  });
+
+  /**
+   * GET /auth/me
+   * Get current user info
+   */
+  fastify.get('/auth/me', {
+    preHandler: [fastify.authenticate],
+  }, async (request, reply) => {
+    const userId = request.user.id;
+
+    const [user] = await db
+      .select()
+      .from(users)
+      .where(eq(users.id, userId))
+      .limit(1);
+
+    if (!user) {
+      return reply.code(404).send({ error: 'User not found' });
+    }
+
+    return {
+      id: user.id,
+      username: user.giteaUsername,
+      email: user.giteaEmail,
+      displayName: user.displayName,
+      avatarUrl: user.avatarUrl,
+      role: user.role,
+    };
+  });
+
+  /**
+   * POST /auth/logout
+   * Logout (client-side token deletion)
+   */
+  fastify.post('/auth/logout', {
+    preHandler: [fastify.authenticate],
+  }, async (request, reply) => {
+    // For JWT, logout is primarily client-side (delete token)
+    // You could maintain a token blacklist in Redis for production
+    return { message: 'Logged out successfully' };
+  });
+};
+
+export default authRoute;