🛠️fix: apply safety settings to Gemini API (#3533)

- Introduce getSafetySettings method for centralized safety settings
- Apply safety settings uniformly in sendCompletion for all models, including Gemini
- Ensure consistent safety settings application in getCompletion
- Update .env.example to clarify safety settings usage for both APIs

.env.example

@@ -117,7 +117,7 @@ BINGAI_TOKEN=user_provided
 GOOGLE_KEY=user_provided
 # GOOGLE_REVERSE_PROXY=
 
-# Gemini API
+# Gemini API (AI Studio)
 # GOOGLE_MODELS=gemini-1.5-flash-latest,gemini-1.0-pro,gemini-1.0-pro-001,gemini-1.0-pro-latest,gemini-1.0-pro-vision-latest,gemini-1.5-pro-latest,gemini-pro,gemini-pro-vision
 
 # Vertex AI
@@ -125,20 +125,24 @@ GOOGLE_KEY=user_provided
 
 # GOOGLE_TITLE_MODEL=gemini-pro
 
-# Google Gemini Safety Settings
+# Google Safety Settings
-# NOTE (Vertex AI): You do not have access to the BLOCK_NONE setting by default.
+# NOTE: These settings apply to both Vertex AI and Gemini API (AI Studio)
-# To use this restricted HarmBlockThreshold setting, you will need to either:
 #
-# (a) Get access through an allowlist via your Google account team
+# For Vertex AI:
-# (b) Switch your account type to monthly invoiced billing following this instruction:
+# To use the BLOCK_NONE setting, you need either:
-#     https://cloud.google.com/billing/docs/how-to/invoiced-billing
+# (a) Access through an allowlist via your Google account team, or
+# (b) Switch to monthly invoiced billing: https://cloud.google.com/billing/docs/how-to/invoiced-billing
+#
+# For Gemini API (AI Studio):
+# BLOCK_NONE is available by default, no special account requirements.
+#
+# Available options: BLOCK_NONE, BLOCK_ONLY_HIGH, BLOCK_MEDIUM_AND_ABOVE, BLOCK_LOW_AND_ABOVE
 #
 # GOOGLE_SAFETY_SEXUALLY_EXPLICIT=BLOCK_ONLY_HIGH
 # GOOGLE_SAFETY_HATE_SPEECH=BLOCK_ONLY_HIGH
 # GOOGLE_SAFETY_HARASSMENT=BLOCK_ONLY_HIGH
 # GOOGLE_SAFETY_DANGEROUS_CONTENT=BLOCK_ONLY_HIGH
 
-
 #============#
 # OpenAI     #
 #============#

api/app/clients/GoogleClient.js

@@ -677,7 +677,6 @@ class GoogleClient extends BaseClient {
   
     const modelName = clientOptions.modelName ?? clientOptions.model ?? '';
     if (modelName?.includes('1.5') && !this.project_id) {
-      /** @type {GenerativeModel} */
       const client = model;
       const requestOptions = {
         contents: _payload,
@@ -693,8 +692,7 @@ class GoogleClient extends BaseClient {
         };
       }
   
-      const safetySettings = _payload.safetySettings;
+      requestOptions.safetySettings = _payload.safetySettings;
-      requestOptions.safetySettings = safetySettings;
   
       const delay = modelName.includes('flash') ? 8 : 14;
       const result = await client.generateContentStream(requestOptions);
@@ -709,11 +707,10 @@ class GoogleClient extends BaseClient {
       return reply;
     }
   
-    const safetySettings = _payload.safetySettings;
     const stream = await model.stream(messages, {
       signal: abortController.signal,
       timeout: 7000,
-      safetySettings: safetySettings,
+      safetySettings: _payload.safetySettings,
     });
   
     let delay = this.options.streamRate || 8;
@@ -871,38 +868,34 @@ class GoogleClient extends BaseClient {
   }
 
   async sendCompletion(payload, opts = {}) {
-    const modelName = payload.parameters?.model;
+    payload.safetySettings = this.getSafetySettings();
-
-    if (modelName && modelName.toLowerCase().includes('gemini')) {
-      const safetySettings = [
-        {
-          category: 'HARM_CATEGORY_SEXUALLY_EXPLICIT',
-          threshold:
-            process.env.GOOGLE_SAFETY_SEXUALLY_EXPLICIT || 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
-        },
-        {
-          category: 'HARM_CATEGORY_HATE_SPEECH',
-          threshold: process.env.GOOGLE_SAFETY_HATE_SPEECH || 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
-        },
-        {
-          category: 'HARM_CATEGORY_HARASSMENT',
-          threshold: process.env.GOOGLE_SAFETY_HARASSMENT || 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
-        },
-        {
-          category: 'HARM_CATEGORY_DANGEROUS_CONTENT',
-          threshold:
-            process.env.GOOGLE_SAFETY_DANGEROUS_CONTENT || 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
-        },
-      ];
-
-      payload.safetySettings = safetySettings;
-    }
   
     let reply = '';
     reply = await this.getCompletion(payload, opts);
     return reply.trim();
   }
   
+  getSafetySettings() {
+    return [
+      {
+        category: 'HARM_CATEGORY_SEXUALLY_EXPLICIT',
+        threshold: process.env.GOOGLE_SAFETY_SEXUALLY_EXPLICIT || 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
+      },
+      {
+        category: 'HARM_CATEGORY_HATE_SPEECH',
+        threshold: process.env.GOOGLE_SAFETY_HATE_SPEECH || 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
+      },
+      {
+        category: 'HARM_CATEGORY_HARASSMENT',
+        threshold: process.env.GOOGLE_SAFETY_HARASSMENT || 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
+      },
+      {
+        category: 'HARM_CATEGORY_DANGEROUS_CONTENT',
+        threshold: process.env.GOOGLE_SAFETY_DANGEROUS_CONTENT || 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
+      },
+    ];
+  }
+
   /* TO-DO: Handle tokens with Google tokenization NOTE: these are required */
   static getTokenizer(encoding, isModelName = false, extendSpecialTokens = {}) {
     if (tokenizersCache[encoding]) {