add support for StepFun (#1611)

### What problem does this PR solve?

#1561

### Type of change
- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Zhedong Cen <cenzhedong2@126.com>

conf/llm_factories.json

@@ -1886,6 +1886,38 @@
                     "model_type": "chat"
                 }
             ]
+        },
+        {
+            "name": "StepFun",
+            "logo": "",
+            "tags": "LLM",
+            "status": "1",
+            "llm": [
+                {
+                    "llm_name": "step-1-8k",
+                    "tags": "LLM,CHAT,15k",
+                    "max_tokens": 8192,
+                    "model_type": "chat"
+                },
+                {
+                    "llm_name": "step-1-32k",
+                    "tags": "LLM,CHAT,32k",
+                    "max_tokens": 32768,
+                    "model_type": "chat"
+                },
+                {
+                    "llm_name": "step-1-128k",
+                    "tags": "LLM,CHAT,128k",
+                    "max_tokens": 131072,
+                    "model_type": "chat"
+                },
+                {
+                    "llm_name": "step-1-256k",
+                    "tags": "LLM,CHAT,256k",
+                    "max_tokens": 262144,
+                    "model_type": "chat"
+                }
+            ]
         }
     ]
 }

rag/llm/__init__.py

@@ -71,6 +71,7 @@ ChatModel = {
     "Bedrock": BedrockChat,
     "Groq": GroqChat,
     'OpenRouter':OpenRouterChat,
+    "StepFun":StepFunChat
 }
 
 

rag/llm/chat_model.py

@@ -897,3 +897,9 @@ class OpenRouterChat(Base):
         self.base_url = "https://openrouter.ai/api/v1"
         self.client = OpenAI(base_url=self.base_url, api_key=key)
         self.model_name = model_name
+
+class StepFunChat(Base):
+    def __init__(self, key, model_name, base_url="https://api.stepfun.com/v1/chat/completions"):
+        if not base_url:
+            base_url = "https://api.stepfun.com/v1/chat/completions"
+        super().__init__(key, model_name, base_url)

web/src/pages/user-setting/setting-model/index.tsx

@@ -65,6 +65,8 @@ const IconMap = {
   Gemini: 'gemini',
   Groq: 'groq-next',
   OpenRouter: 'open-router',
+  LocalAI:'local-ai',
+  StepFun:'stepfun'
 };
 
 const LlmIcon = ({ name }: { name: string }) => {