add model list endpoint (#96)

* add model list endpoint

* fix: guard models list endpoint errors

src/server/modules/proxy/proxy.controller.ts

@@ -1,6 +1,7 @@
 import {
   Controller,
   Post,
+  Get,
   Body,
   Res,
   HttpStatus,
@@ -22,6 +23,12 @@ import {
   GeminiResponse,
 } from './interfaces/request-interfaces';
 import { ProxyGuard } from './proxy.guard';
+import {
+  getAllDynamicModels,
+  MODEL_LIST_CREATED_AT,
+  MODEL_LIST_OWNER,
+} from '../../../lib/antigravity/ModelMapping';
+import { getServerConfig } from '../../server-config';
 
 
 
@@ -30,7 +37,37 @@ import { ProxyGuard } from './proxy.guard';
 export class ProxyController {
   private readonly logger = new Logger(ProxyController.name);
 
-  constructor(@Inject(ProxyService) private readonly proxyService: ProxyService) {}
+  constructor(@Inject(ProxyService) private readonly proxyService: ProxyService) { }
+
+  @Get('models')
+  listModels(@Res() res: FastifyReply) {
+    try {
+      const config = getServerConfig();
+      const customMapping = config?.custom_mapping ?? {};
+      const modelIds = getAllDynamicModels(customMapping);
+
+      const data = modelIds.map((id) => ({
+        id,
+        object: 'model',
+        created: MODEL_LIST_CREATED_AT,
+        owned_by: MODEL_LIST_OWNER,
+      }));
+
+      res.status(HttpStatus.OK).send({
+        object: 'list',
+        data,
+      });
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Failed to list models';
+      this.logger.error(message, error instanceof Error ? error.stack : undefined);
+      res.status(HttpStatus.INTERNAL_SERVER_ERROR).send({
+        error: {
+          message,
+          type: 'server_error',
+        },
+      });
+    }
+  }
 
   @Post('chat/completions')
   async chatCompletions(@Body() body: OpenAIChatRequest, @Res() res: FastifyReply) {
@@ -186,12 +223,12 @@ export class ProxyController {
           content:
             imageParts.length > 0
               ? [
-                  {
-                    type: 'text',
-                    text: body.prompt ?? 'Please edit this image based on the provided instruction.',
-                  },
-                  ...imageParts,
-                ]
+                {
+                  type: 'text',
+                  text: body.prompt ?? 'Please edit this image based on the provided instruction.',
+                },
+                ...imageParts,
+              ]
               : (body.prompt ?? 'Please edit this image based on the provided instruction.'),
         },
       ],