add openai custom base uri

sample.config.toml

@@ -6,6 +6,7 @@ CHAT_MODEL = "gpt-3.5-turbo" # Name of the model to use
 
 [API_KEYS]
 OPENAI = "" # OpenAI API key - sk-1234567890abcdef1234567890abcdef
+OPENAI_BASE_URL = "" # Custom Open AI Base URL , may be use cloudflare AI Gateway 
 
 [API_ENDPOINTS]
 SEARXNG = "http://localhost:32768" # SearxNG API URL

src/lib/providers.ts

@@ -1,10 +1,11 @@
 import { ChatOpenAI, OpenAIEmbeddings } from '@langchain/openai';
 import { ChatOllama } from '@langchain/community/chat_models/ollama';
 import { OllamaEmbeddings } from '@langchain/community/embeddings/ollama';
-import { getOllamaApiEndpoint, getOpenaiApiKey } from '../config';
+import { getOllamaApiEndpoint, getOpenaiApiBaseUrl, getOpenaiApiKey } from '../config';
 
 export const getAvailableProviders = async () => {
   const openAIApiKey = getOpenaiApiKey();
+  const openAIBaseUrl = getOpenaiApiBaseUrl();
   const ollamaEndpoint = getOllamaApiEndpoint();
 
   const models = {};
@@ -16,15 +17,20 @@ export const getAvailableProviders = async () => {
           openAIApiKey,
           modelName: 'gpt-3.5-turbo',
           temperature: 0.7,
+
         }),
         'gpt-4': new ChatOpenAI({
           openAIApiKey,
           modelName: 'gpt-4',
           temperature: 0.7,
+          configuration: {
+            baseURL: openAIBaseUrl,
+          },
         }),
         embeddings: new OpenAIEmbeddings({
           openAIApiKey,
           modelName: 'text-embedding-3-large',
+          
         }),
       };
     } catch (err) {