Add Google Gemini as a summary provider

Author: johnwarne

README.md

@@ -157,16 +157,6 @@ REDDIT_CLIENT_ID=your_reddit_client_id
 # Default value: (empty)
 REDDIT_CLIENT_SECRET=your_reddit_client_secret
 
-# OpenAI API key
-# Used to connect to OpenAI for article summaries when the "Include summary" checkbox is checked
-# Default value: (empty)
-OPENAI_API_KEY=your_openai_api_key
-
-# OpenAI API model
-# Model used for article summaries
-# Default value: gpt-4o-mini
-OPENAI_API_MODEL=specified_openai_model
-
 # Ollama URL
 # URL to your Ollama instance for article summaries
 # Default value: (empty)
@@ -177,6 +167,26 @@ OLLAMA_URL=your_ollama_url
 # Default value: (empty)
 OLLAMA_MODEL=specified_ollama_model
 
+# Google Gemini API key
+# Used to connect to Google Gemini for article summaries when the "Include summary" checkbox is checked
+# Default value: (empty)
+GOOGLE_GEMINI_API_KEY=your_google_gemini_api_key
+
+# Google Gemini API model
+# Model used for article summaries
+# Default value: gemini-2.5-flash
+GOOGLE_GEMINI_API_MODEL=specified_google_gemini_model
+
+# OpenAI API key
+# Used to connect to OpenAI for article summaries when the "Include summary" checkbox is checked
+# Default value: (empty)
+OPENAI_API_KEY=your_openai_api_key
+
+# OpenAI API model
+# Model used for article summaries
+# Default value: gpt-4o-mini
+OPENAI_API_MODEL=specified_openai_model
+
 # Summary system prompt
 # The prompt that guides the LLM model to give accurate-ish and concise article summaries
 # Default value: You are web article summarizer. Use the following pieces of retrieved context to answer the question. Do not answer from your own knowledge base. If the answer isn't present in the knowledge base, refrain from providing an answer based on your own knowledge. Instead, say nothing. Output should be limited to one paragraph with a maximum of three sentences, and keep the answer concise. Always complete the last sentence. Do not hallucinate or make up information.

classes/webpage-analyzer.php

@@ -568,6 +568,60 @@ public function getSummary() {
         }
       }
     }
+    if(!$summary && !empty(GOOGLE_GEMINI_API_KEY)) {
+      $this->log->info('Trying to get summary from Google Gemini API for ' . $this->url);
+      $gemini_url = 'https://generativelanguage.googleapis.com/v1beta/openai/chat/completions';
+      $gemini_model = GOOGLE_GEMINI_API_MODEL ?? 'gemini-2.5-flash';
+      $curl_options = array(
+        CURLOPT_CUSTOMREQUEST => 'POST',
+        CURLOPT_POSTFIELDS => json_encode(array(
+          'max_tokens' => 1000,
+          'temperature' => SUMMARY_TEMPERATURE,
+          'model' => $gemini_model,
+          'messages' => [
+            array(
+              'role'    => 'system',
+              'content' => SUMMARY_SYSTEM_PROMPT
+            ),
+            array(
+              'role'    => 'user',
+              'content' => $parsed_content
+            )
+          ]
+        )),
+        CURLOPT_HTTPHEADER => array(
+          'Content-Type: application/json',
+          'Authorization: Bearer ' . GOOGLE_GEMINI_API_KEY
+        )
+      );
+      $curl_response = curlURL($gemini_url, $curl_options);
+      if (!$curl_response) {
+        $this->log->error('Google Gemini API response is empty or invalid');
+      } else {
+        $response = json_decode($curl_response, true);
+        if (!$response) {
+          $this->log->error('Google Gemini API response is not valid JSON');
+        } elseif (!empty($response['choices'][0]['message']['content']) && strlen($response['choices'][0]['message']['content']) > 100) {
+          $summary          = $response['choices'][0]['message']['content'];
+          $summary_provider = 'google_gemini';
+          $summary_model    = $gemini_model;
+          $this->log->info("Summary for URL $this->url generated by Google Gemini model $summary_model");
+        } else {
+          if(!empty($response['error']['message'])) {
+            $this->log->error('Google Gemini API response contains an error: ' . $response['error']['message']);
+          } elseif (!empty($response['choices'][0]['finish_reason']) && $response['choices'][0]['finish_reason'] == 'length') {
+            $total_tokens = $response['usage']['total_tokens'] ?? 'unknown';
+            $this->log->error(
+              'Google Gemini API response was cut off due to length limit. ' .
+              'Try increasing SUMMARY_MAX_TOKENS. ' .
+              'total_tokens: ' . $total_tokens . ', SUMMARY_MAX_TOKENS: ' . SUMMARY_MAX_TOKENS
+            );
+          } else {
+            $this->log->error('Google Gemini API response does not contain valid summary content');
+          }
+        }
+      }
+    }
     if(!$summary && !empty(OPENAI_API_KEY)) {
       $this->log->info('Trying to get summary from OpenAI API for ' . $this->url);
       $openai_url = 'https://api.openai.com/v1/chat/completions';
@@ -597,19 +651,21 @@ public function getSummary() {
       $curl_response = curlURL($openai_url, $curl_options);
       if (!$curl_response) {
         $this->log->error('OpenAI API response is empty or invalid');
-        $summary = '';
-      }
-      $response = json_decode($curl_response, true);
-      if (!empty($response['choices'][0]['message']['content']) && strlen($response['choices'][0]['message']['content']) > 100){
-        $summary          = $response['choices'][0]['message']['content'];
-        $summary_provider = 'openai';
-        $summary_model    = $openai_model;
-        $this->log->info("Summary for URL $this->url generated by OpenAI model $summary_model");
       } else {
-        if(!empty($response['error']['message'])) {
-          $this->log->error('OpenAI API response contains an error: ' . $response['error']['message']);
+        $response = json_decode($curl_response, true);
+        if (!$response) {
+          $this->log->error('OpenAI API response is not valid JSON');
+        } elseif (!empty($response['choices'][0]['message']['content']) && strlen($response['choices'][0]['message']['content']) > 100) {
+          $summary          = $response['choices'][0]['message']['content'];
+          $summary_provider = 'openai';
+          $summary_model    = $openai_model;
+          $this->log->info("Summary for URL $this->url generated by OpenAI model $summary_model");
         } else {
-          $this->log->error('OpenAI API response does not contain valid summary content');
+          if(!empty($response['error']['message'])) {
+            $this->log->error('OpenAI API response contains an error: ' . $response['error']['message']);
+          } else {
+            $this->log->error('OpenAI API response does not contain valid summary content');
+          }
         }
       }
     }

config.php

@@ -260,20 +260,27 @@
 define('INCLUDE_CONTENT', $include_content);
 
 
-// OpenAI API
-$openai_api_key = $_SERVER["OPENAI_API_KEY"] ?? $_ENV["OPENAI_API_KEY"] ?? null;
-define('OPENAI_API_KEY', $openai_api_key);
-$openai_api_model = $_SERVER["OPENAI_API_MODEL"] ?? $_ENV["OPENAI_API_MODEL"] ?? 'gpt-4o-mini';
-define('OPENAI_API_MODEL', $openai_api_model);
-
-
 // Ollama API
 $ollama_url = $_SERVER["OLLAMA_URL"] ?? $_ENV["OLLAMA_URL"] ?? null;
 define('OLLAMA_URL', $ollama_url);
 $ollama_model = $_SERVER["OLLAMA_MODEL"] ?? $_ENV["OLLAMA_MODEL"] ?? null;
 define('OLLAMA_MODEL', $ollama_model);
 
 
+// Google Gemini API
+$gemini_api_key = $_SERVER["GOOGLE_GEMINI_API_KEY"] ?? $_ENV["GOOGLE_GEMINI_API_KEY"] ?? null;
+define('GOOGLE_GEMINI_API_KEY', $gemini_api_key);
+$gemini_api_model = $_SERVER["GOOGLE_GEMINI_API_MODEL"] ?? $_ENV["GOOGLE_GEMINI_API_MODEL"] ?? 'gemini-1';
+define('GOOGLE_GEMINI_API_MODEL', $gemini_api_model);
+
+
+// OpenAI API
+$openai_api_key = $_SERVER["OPENAI_API_KEY"] ?? $_ENV["OPENAI_API_KEY"] ?? null;
+define('OPENAI_API_KEY', $openai_api_key);
+$openai_api_model = $_SERVER["OPENAI_API_MODEL"] ?? $_ENV["OPENAI_API_MODEL"] ?? 'gpt-4o-mini';
+define('OPENAI_API_MODEL', $openai_api_model);
+
+
 // Summary enabled
 $summary_enabled = false;
 if (OPENAI_API_KEY !== null) $summary_enabled = true;