refactor add LLM (#2508)

### What problem does this PR solve?

#2487

### Type of change

- [x] Refactoring

api/apps/llm_app.py

 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+import json
+
 from flask import request
 from flask_login import login_required, current_user
 from api.db.services.llm_service import LLMFactoriesService, TenantLLMService, LLMService
     req = request.json
     factory = req["llm_factory"]
 
+    def apikey_json(keys):
+        nonlocal req
+        return json.dumps({k: req.get(k, "") for k in keys})
+
     if factory == "VolcEngine":
         # For VolcEngine, due to its special authentication method
         # Assemble ark_api_key endpoint_id into api_key
         llm_name = req["llm_name"]
-        api_key = f'{{ "ark_api_key":"{req.get("ark_api_key", "")}", "ep_id":"{req.get("endpoint_id", "")}" }}'
+        api_key = apikey_json(["ark_api_key", "endpoint_id"])
+
     elif factory == "Tencent Hunyuan":
-        api_key = '{' + f'"hunyuan_sid": "{req.get("hunyuan_sid", "")}", ' \
-                        f'"hunyuan_sk": "{req.get("hunyuan_sk", "")}"' + '}'
-        req["api_key"] = api_key
+        req["api_key"] = apikey_json(["hunyuan_sid", "hunyuan_sk"])
         return set_api_key()
+
     elif factory == "Tencent Cloud":
-        api_key = '{' + f'"tencent_cloud_sid": "{req.get("tencent_cloud_sid", "")}", ' \
-                f'"tencent_cloud_sk": "{req.get("tencent_cloud_sk", "")}"' + '}'
-        req["api_key"] = api_key
+        req["api_key"] = apikey_json(["tencent_cloud_sid", "tencent_cloud_sk"])
+
     elif factory == "Bedrock":
         # For Bedrock, due to its special authentication method
         # Assemble bedrock_ak, bedrock_sk, bedrock_region
         llm_name = req["llm_name"]
-        api_key = '{' + f'"bedrock_ak": "{req.get("bedrock_ak", "")}", ' \
-                        f'"bedrock_sk": "{req.get("bedrock_sk", "")}", ' \
-                        f'"bedrock_region": "{req.get("bedrock_region", "")}", ' + '}'
+        api_key = apikey_json(["bedrock_ak", "bedrock_sk", "bedrock_region"])
+
     elif factory == "LocalAI":
         llm_name = req["llm_name"]+"___LocalAI"
         api_key = "xxxxxxxxxxxxxxx"
+
     elif factory == "OpenAI-API-Compatible":
         llm_name = req["llm_name"]+"___OpenAI-API"
         api_key = req.get("api_key","xxxxxxxxxxxxxxx")
+
     elif factory =="XunFei Spark":
         llm_name = req["llm_name"]
-        api_key = req.get("spark_api_password","xxxxxxxxxxxxxxx") 
+        api_key = req.get("spark_api_password","xxxxxxxxxxxxxxx")
+
     elif factory == "BaiduYiyan":
         llm_name = req["llm_name"]
-        api_key = '{' + f'"yiyan_ak": "{req.get("yiyan_ak", "")}", ' \
-                f'"yiyan_sk": "{req.get("yiyan_sk", "")}"' + '}'
+        api_key = apikey_json(["yiyan_ak", "yiyan_sk"])
+
     elif factory == "Fish Audio":
         llm_name = req["llm_name"]
-        api_key = '{' + f'"fish_audio_ak": "{req.get("fish_audio_ak", "")}", ' \
-                f'"fish_audio_refid": "{req.get("fish_audio_refid", "59cb5986671546eaa6ca8ae6f29f6d22")}"' + '}'
+        api_key = apikey_json(["fish_audio_ak", "fish_audio_refid"])
+
     elif factory == "Google Cloud":
         llm_name = req["llm_name"]
-        api_key = (
-            "{" + f'"google_project_id": "{req.get("google_project_id", "")}", '
-            f'"google_region": "{req.get("google_region", "")}", '
-            f'"google_service_account_key": "{req.get("google_service_account_key", "")}"'
-            + "}"
-        )
+        api_key = apikey_json(["google_project_id", "google_region", "google_service_account_key"])
+
     else:
         llm_name = req["llm_name"]
-        api_key = req.get("api_key","xxxxxxxxxxxxxxx") 
+        api_key = req.get("api_key", "xxxxxxxxxxxxxxx")
 
     llm = {
         "tenant_id": current_user.id,

rag/llm/chat_model.py

         """
         base_url = base_url if base_url else 'https://ark.cn-beijing.volces.com/api/v3'
         ark_api_key = json.loads(key).get('ark_api_key', '')
-        model_name = json.loads(key).get('ep_id', '')
+        model_name = json.loads(key).get('ep_id', '') + json.loads(key).get('endpoint_id', '')
         super().__init__(ark_api_key, model_name, base_url)