feat(suggestions): handle custom OpenAI

src/routes/suggestions.ts

@@ -4,14 +4,27 @@ import { BaseChatModel } from '@langchain/core/language_models/chat_models';
 import { getAvailableChatModelProviders } from '../lib/providers';
 import { HumanMessage, AIMessage } from '@langchain/core/messages';
 import logger from '../utils/logger';
+import { ChatOpenAI } from '@langchain/openai';
 
 const router = express.Router();
 
+interface ChatModel {
+  provider: string;
+  model: string;
+  customOpenAIBaseURL?: string;
+  customOpenAIKey?: string;
+}
+
+interface SuggestionsBody {
+  chatHistory: any[];
+  chatModel?: ChatModel;
+}
+
 router.post('/', async (req, res) => {
   try {
-    let { chat_history, chat_model, chat_model_provider } = req.body;
+    let body: SuggestionsBody = req.body;
 
-    chat_history = chat_history.map((msg: any) => {
+    const chatHistory = body.chatHistory.map((msg: any) => {
       if (msg.role === 'user') {
         return new HumanMessage(msg.content);
       } else if (msg.role === 'assistant') {
@@ -19,22 +32,50 @@ router.post('/', async (req, res) => {
       }
     });
 
-    const chatModels = await getAvailableChatModelProviders();
-    const provider = chat_model_provider ?? Object.keys(chatModels)[0];
-    const chatModel = chat_model ?? Object.keys(chatModels[provider])[0];
+    const chatModelProviders = await getAvailableChatModelProviders();
+
+    const chatModelProvider =
+      body.chatModel?.provider || Object.keys(chatModelProviders)[0];
+    const chatModel =
+      body.chatModel?.model ||
+      Object.keys(chatModelProviders[chatModelProvider])[0];
 
     let llm: BaseChatModel | undefined;
 
-    if (chatModels[provider] && chatModels[provider][chatModel]) {
-      llm = chatModels[provider][chatModel].model as BaseChatModel | undefined;
+    if (body.chatModel?.provider === 'custom_openai') {
+      if (
+        !body.chatModel?.customOpenAIBaseURL ||
+        !body.chatModel?.customOpenAIKey
+      ) {
+        return res
+          .status(400)
+          .json({ message: 'Missing custom OpenAI base URL or key' });
+      }
+
+      llm = new ChatOpenAI({
+        modelName: body.chatModel.model,
+        openAIApiKey: body.chatModel.customOpenAIKey,
+        temperature: 0.7,
+        configuration: {
+          baseURL: body.chatModel.customOpenAIBaseURL,
+        },
+      }) as unknown as BaseChatModel;
+    } else if (
+      chatModelProviders[chatModelProvider] &&
+      chatModelProviders[chatModelProvider][chatModel]
+    ) {
+      llm = chatModelProviders[chatModelProvider][chatModel]
+        .model as unknown as BaseChatModel | undefined;
     }
 
     if (!llm) {
-      res.status(500).json({ message: 'Invalid LLM model selected' });
-      return;
+      return res.status(400).json({ message: 'Invalid model selected' });
     }
 
-    const suggestions = await generateSuggestions({ chat_history }, llm);
+    const suggestions = await generateSuggestions(
+      { chat_history: chatHistory },
+      llm,
+    );
 
     res.status(200).json({ suggestions: suggestions });
   } catch (err) {