cd8eee11b8
DuckDuckGo's HTML search endpoint now requires vqd session tokens, making server-side search-based URL resolution unreliable. Simplified the thumbnail pipeline: - OG scrape only for non-aggregator URLs (direct publisher pages) - AI image generation via OpenRouter for aggregator articles (Google News) - Added Image Model settings field in admin UI - Added thumbnail_local column for AI-generated images - Updated public/admin display to check thumbnail_local as fallback - Removed all DuckDuckGo search code (find_article_url_via_search, extract_ddg_url, resolve_article_for_scraping) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
652 lines
24 KiB
PHP
652 lines
24 KiB
PHP
<?php
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/**
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* LLM integration via OpenRouter for article analysis.
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*
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* Provides keyword extraction and article summarization
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* using configurable models through the OpenRouter API.
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*
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* @since 1.1.0
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*/
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class Peptide_News_LLM {
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/** @var string OpenRouter API endpoint. */
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const API_URL = 'https://openrouter.ai/api/v1/chat/completions';
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/** @var int Maximum retries for rate-limited requests. */
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const MAX_RETRIES = 3;
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/** @var int Maximum elapsed seconds before stopping a batch. */
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const BATCH_TIMEOUT = 120;
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/**
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* Check whether LLM processing is enabled and configured.
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*
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* @return bool
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*/
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public static function is_enabled() {
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$api_key = get_option( 'peptide_news_openrouter_api_key', '' );
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return ! empty( $api_key ) && (bool) get_option( 'peptide_news_llm_enabled', 0 );
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}
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/**
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* Validate an OpenRouter model ID format.
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*
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* Accepts patterns like: provider/model-name, provider/model-name:version
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*
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* @param string $model
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* @return bool
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*/
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public static function is_valid_model( $model ) {
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return (bool) preg_match( '/^[a-zA-Z0-9_-]+\/[a-zA-Z0-9._-]+(:[a-zA-Z0-9._-]+)?$/', $model );
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}
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/**
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* Process a single article: extract keywords and generate a summary.
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*
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* Skips articles that already have both tags and ai_summary unless $force is true.
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*
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* @param object $article Database row with id, title, excerpt, content, categories.
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* @param bool $force Re-process even if already analyzed.
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* @return array Results with 'keywords', 'summary', and 'success' keys.
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*/
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public static function process_article( $article, $force = false ) {
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if ( ! self::is_enabled() ) {
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return array( 'keywords' => '', 'summary' => '', 'success' => false );
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}
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$results = array(
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'keywords' => '',
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'summary' => '',
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'success' => false,
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);
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$api_key = get_option( 'peptide_news_openrouter_api_key', '' );
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$any_success = false;
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// --- Keyword extraction ---
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$keywords_model = get_option( 'peptide_news_llm_keywords_model', 'google/gemini-2.0-flash-001' );
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$need_keywords = $force || empty( $article->tags );
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if ( $need_keywords && self::is_valid_model( $keywords_model ) ) {
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$keywords_prompt = self::build_keywords_prompt( $article );
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$keywords_result = self::call_openrouter( $api_key, $keywords_model, $keywords_prompt );
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if ( ! is_wp_error( $keywords_result ) ) {
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$results['keywords'] = self::sanitize_keywords( $keywords_result );
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$any_success = true;
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} else {
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self::log_error( 'Keyword extraction failed for article ' . $article->id . ': ' . $keywords_result->get_error_message() );
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}
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} elseif ( $need_keywords ) {
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self::log_error( 'Invalid keywords model ID: ' . $keywords_model );
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}
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// --- Summarization ---
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$summary_model = get_option( 'peptide_news_llm_summary_model', 'google/gemini-2.0-flash-001' );
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$need_summary = $force || empty( $article->ai_summary );
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if ( $need_summary && self::is_valid_model( $summary_model ) ) {
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$summary_prompt = self::build_summary_prompt( $article );
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$summary_result = self::call_openrouter( $api_key, $summary_model, $summary_prompt );
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if ( ! is_wp_error( $summary_result ) ) {
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// Strip all HTML tags from LLM output to prevent XSS.
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$results['summary'] = sanitize_textarea_field( wp_strip_all_tags( $summary_result ) );
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$any_success = true;
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} else {
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self::log_error( 'Summarization failed for article ' . $article->id . ': ' . $summary_result->get_error_message() );
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}
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} elseif ( $need_summary ) {
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self::log_error( 'Invalid summary model ID: ' . $summary_model );
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}
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$results['success'] = $any_success;
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// --- Persist results ---
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if ( ! empty( $results['keywords'] ) || ! empty( $results['summary'] ) ) {
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self::save_results( $article->id, $results, $force );
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}
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return $results;
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}
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/**
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* Process all unanalyzed articles (called after a fetch cycle).
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*
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* Includes a time-based guard to prevent cron timeouts and
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* respects the admin-configured max articles per cycle.
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*
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* @param int $batch_size Max articles to process per run.
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* @return int Number of articles successfully processed.
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*/
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public static function process_unanalyzed( $batch_size = 10 ) {
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if ( ! self::is_enabled() ) {
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return 0;
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}
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// Respect admin cost-control setting.
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$max_per_cycle = absint( get_option( 'peptide_news_llm_max_articles', 10 ) );
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if ( $max_per_cycle < 1 ) {
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$max_per_cycle = 10;
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}
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$batch_size = min( $batch_size, $max_per_cycle );
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global $wpdb;
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$table = $wpdb->prefix . 'peptide_news_articles';
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// Find articles missing tags OR ai_summary.
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$articles = $wpdb->get_results( $wpdb->prepare(
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"SELECT id, title, excerpt, content, categories, tags, ai_summary
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FROM {$table}
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WHERE is_active = 1
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AND ( tags = '' OR ai_summary = '' OR ai_summary IS NULL )
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ORDER BY fetched_at DESC
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LIMIT %d",
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$batch_size
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) );
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$processed = 0;
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$start_time = time();
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foreach ( $articles as $article ) {
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// Timeout guard: stop if approaching the limit.
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if ( ( time() - $start_time ) >= self::BATCH_TIMEOUT ) {
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self::log_error( 'Batch timeout reached after ' . $processed . ' articles. Remaining will process next cycle.' );
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break;
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}
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$result = self::process_article( $article );
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// Only count successful processing.
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if ( ! empty( $result['success'] ) ) {
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$processed++;
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}
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// Small delay to avoid rate limiting.
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if ( next( $articles ) !== false ) {
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usleep( 500000 ); // 0.5s between articles.
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}
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}
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// Clear article cache once per batch (not per article).
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if ( $processed > 0 ) {
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self::clear_article_cache();
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}
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// Log the processing result.
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update_option( 'peptide_news_last_llm_process', array(
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'time' => current_time( 'mysql' ),
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'processed' => $processed,
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'attempted' => count( $articles ),
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) );
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return $processed;
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}
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/**
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* Build the prompt for keyword extraction.
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*
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* @param object $article
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* @return string
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*/
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private static function build_keywords_prompt( $article ) {
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$text = $article->title;
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if ( ! empty( $article->excerpt ) ) {
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$text .= "\n\n" . $article->excerpt;
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}
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if ( ! empty( $article->content ) ) {
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// Limit content to ~2000 chars to keep token usage reasonable.
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$text .= "\n\n" . mb_substr( wp_strip_all_tags( $article->content ), 0, 2000 );
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}
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return "Extract 5-10 relevant keywords or key phrases from this peptide research article. "
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. "Return ONLY a comma-separated list of keywords, nothing else. No numbering, no explanations.\n\n"
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. "Article:\n" . $text;
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}
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/**
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* Build the prompt for article summarization.
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*
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* @param object $article
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* @return string
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*/
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private static function build_summary_prompt( $article ) {
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$text = $article->title;
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if ( ! empty( $article->excerpt ) ) {
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$text .= "\n\n" . $article->excerpt;
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}
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if ( ! empty( $article->content ) ) {
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$text .= "\n\n" . mb_substr( wp_strip_all_tags( $article->content ), 0, 3000 );
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}
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return "Summarize this peptide research article in 3-4 sentences. "
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. "Be concise, factual, and accessible to a general audience interested in peptide science. "
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. "Do not include any preamble or labels — just the summary text.\n\n"
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. "Article:\n" . $text;
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}
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/**
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* Call the OpenRouter API with retry logic for 429 rate limits.
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*
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* @param string $api_key
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* @param string $model
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* @param string $prompt
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* @return string|WP_Error The response text or an error.
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*/
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private static function call_openrouter( $api_key, $model, $prompt ) {
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$body = array(
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'model' => $model,
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'messages' => array(
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array(
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'role' => 'user',
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'content' => $prompt,
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),
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),
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'max_tokens' => 300,
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'temperature' => 0.3,
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);
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$retries = 0;
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$backoff = 2; // Initial backoff in seconds.
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while ( $retries <= self::MAX_RETRIES ) {
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$response = wp_remote_post( self::API_URL, array(
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'timeout' => 30,
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'headers' => array(
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'Authorization' => 'Bearer ' . $api_key,
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'Content-Type' => 'application/json',
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'HTTP-Referer' => home_url(),
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'X-Title' => 'Peptide News Aggregator',
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),
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'body' => wp_json_encode( $body ),
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) );
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if ( is_wp_error( $response ) ) {
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return $response;
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}
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$status = wp_remote_retrieve_response_code( $response );
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// Handle rate limiting with exponential backoff.
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if ( 429 === $status && $retries < self::MAX_RETRIES ) {
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$retry_after = wp_remote_retrieve_header( $response, 'retry-after' );
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$wait = $retry_after ? min( (int) $retry_after, 30 ) : $backoff;
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sleep( $wait );
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$retries++;
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$backoff *= 2;
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continue;
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}
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break;
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}
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$data = json_decode( wp_remote_retrieve_body( $response ), true );
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if ( $status < 200 || $status >= 300 ) {
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$error_msg = 'HTTP ' . $status;
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if ( is_array( $data ) && isset( $data['error'] ) && is_array( $data['error'] ) && isset( $data['error']['message'] ) ) {
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$error_msg = $data['error']['message'];
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}
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return new WP_Error( 'openrouter_error', $error_msg );
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}
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// Validate the response structure thoroughly.
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if ( ! is_array( $data ) ) {
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return new WP_Error( 'openrouter_invalid', 'Invalid JSON response from OpenRouter' );
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}
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if ( ! isset( $data['choices'] ) || ! is_array( $data['choices'] ) || empty( $data['choices'] ) ) {
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return new WP_Error( 'openrouter_empty', 'No choices in OpenRouter response' );
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}
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if ( ! isset( $data['choices'][0]['message'] ) || ! is_array( $data['choices'][0]['message'] ) ) {
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return new WP_Error( 'openrouter_empty', 'Malformed choice in OpenRouter response' );
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}
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if ( ! isset( $data['choices'][0]['message']['content'] ) || '' === trim( $data['choices'][0]['message']['content'] ) ) {
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return new WP_Error( 'openrouter_empty', 'Empty content in OpenRouter response' );
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}
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return trim( $data['choices'][0]['message']['content'] );
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}
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/**
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* Sanitize and normalize keyword output from the LLM.
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*
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* @param string $raw Raw comma-separated keywords.
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* @return string Cleaned, deduplicated, comma-separated list.
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*/
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private static function sanitize_keywords( $raw ) {
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// Strip all HTML first to prevent XSS.
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$raw = wp_strip_all_tags( $raw );
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// Remove any numbering, bullets, or extra formatting.
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$raw = preg_replace( '/^\d+[\.\)]\s*/m', '', $raw );
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$raw = preg_replace( '/^[-*\x{2022}]\s*/mu', '', $raw );
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$keywords = array_map( 'trim', explode( ',', $raw ) );
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$keywords = array_map( 'sanitize_text_field', $keywords );
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$keywords = array_filter( $keywords );
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$keywords = array_unique( $keywords );
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// Limit to 10 keywords max.
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$keywords = array_slice( $keywords, 0, 10 );
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return implode( ', ', $keywords );
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}
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/**
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* Save LLM results to the database.
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*
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* Note: Cache is NOT cleared here — the caller (process_unanalyzed)
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* clears cache once per batch for efficiency.
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*
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* @param int $article_id
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* @param array $results Array with 'keywords' and 'summary'.
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* @param bool $force Overwrite existing values.
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*/
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private static function save_results( $article_id, $results, $force = false ) {
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global $wpdb;
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$table = $wpdb->prefix . 'peptide_news_articles';
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$update = array();
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$format = array();
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if ( ! empty( $results['keywords'] ) ) {
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$update['tags'] = $results['keywords'];
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$format[] = '%s';
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}
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if ( ! empty( $results['summary'] ) ) {
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$update['ai_summary'] = $results['summary'];
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$format[] = '%s';
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}
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if ( ! empty( $update ) ) {
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$wpdb->update(
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$table,
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$update,
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array( 'id' => $article_id ),
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$format,
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array( '%d' )
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);
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}
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}
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/**
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* Generate AI thumbnails for articles that still have no image
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* after OG scraping. Uses an image generation model via OpenRouter.
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*
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* @param int $batch_size Max articles to process per run.
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* @return int Number of thumbnails generated.
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*/
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public static function generate_missing_thumbnails( $batch_size = 10 ) {
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if ( ! self::is_enabled() ) {
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return 0;
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}
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$image_model = get_option( 'peptide_news_llm_image_model', '' );
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if ( empty( $image_model ) ) {
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return 0;
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}
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global $wpdb;
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$table = $wpdb->prefix . 'peptide_news_articles';
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// Find active articles with no usable thumbnail (including _no_image sentinel).
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$articles = $wpdb->get_results( $wpdb->prepare(
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"SELECT id, title, excerpt, ai_summary, tags, categories
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FROM {$table}
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WHERE is_active = 1
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AND ( thumbnail_url = '' OR thumbnail_url IS NULL OR thumbnail_url = '_no_image' )
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AND ( thumbnail_local = '' OR thumbnail_local IS NULL )
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ORDER BY fetched_at DESC
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LIMIT %d",
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$batch_size
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) );
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if ( empty( $articles ) ) {
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return 0;
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}
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$api_key = get_option( 'peptide_news_openrouter_api_key', '' );
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$generated = 0;
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foreach ( $articles as $article ) {
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$image_data = self::generate_article_thumbnail( $api_key, $image_model, $article );
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if ( $image_data ) {
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// Save the image locally.
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$local_path = self::save_generated_image( $image_data, $article->id );
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if ( $local_path ) {
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$wpdb->update(
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$table,
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array( 'thumbnail_local' => $local_path ),
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array( 'id' => $article->id ),
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array( '%s' ),
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array( '%d' )
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);
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$generated++;
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}
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}
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// Respect rate limits.
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usleep( 1000000 ); // 1 second between generations.
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}
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if ( $generated > 0 ) {
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self::clear_article_cache();
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}
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return $generated;
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}
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/**
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* Generate a thumbnail image for a single article via OpenRouter.
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*
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* @param string $api_key
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* @param string $model Image generation model ID.
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* @param object $article Database row.
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* @return string|false Base64-encoded image data, or false.
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*/
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private static function generate_article_thumbnail( $api_key, $model, $article ) {
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$prompt = self::build_image_prompt( $article );
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$body = array(
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'model' => $model,
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'messages' => array(
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array(
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'role' => 'user',
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'content' => $prompt,
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),
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),
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);
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$response = wp_remote_post( self::API_URL, array(
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'timeout' => 60,
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'headers' => array(
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'Authorization' => 'Bearer ' . $api_key,
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'Content-Type' => 'application/json',
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'HTTP-Referer' => home_url(),
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'X-Title' => 'Peptide News Aggregator',
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),
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'body' => wp_json_encode( $body ),
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) );
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if ( is_wp_error( $response ) ) {
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self::log_error( 'Image generation failed for article ' . $article->id . ': ' . $response->get_error_message() );
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return false;
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}
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$status = wp_remote_retrieve_response_code( $response );
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$data = json_decode( wp_remote_retrieve_body( $response ), true );
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if ( $status < 200 || $status >= 300 ) {
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$error = isset( $data['error']['message'] ) ? $data['error']['message'] : 'HTTP ' . $status;
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self::log_error( 'Image generation HTTP error for article ' . $article->id . ': ' . $error );
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return false;
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}
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// Extract the image data from the response.
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// OpenRouter image models may return base64 data in various formats.
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if ( ! empty( $data['choices'][0]['message']['content'] ) ) {
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$content = $data['choices'][0]['message']['content'];
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// If content is an array (multimodal), look for image parts.
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if ( is_array( $content ) ) {
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foreach ( $content as $part ) {
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if ( isset( $part['type'] ) && 'image_url' === $part['type']
|
|
&& isset( $part['image_url'] ) && is_array( $part['image_url'] )
|
|
&& isset( $part['image_url']['url'] ) && is_string( $part['image_url']['url'] ) ) {
|
|
$url = $part['image_url']['url'];
|
|
if ( strpos( $url, 'data:image' ) === 0 ) {
|
|
// Extract base64 from data URL.
|
|
$base64 = preg_replace( '/^data:image\/\w+;base64,/', '', $url );
|
|
$decoded = base64_decode( $base64, true );
|
|
if ( false === $decoded ) {
|
|
self::log_error( 'Invalid base64 image data for article.' );
|
|
return false;
|
|
}
|
|
return $decoded;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// If it's a URL string, download it (with SSRF protection).
|
|
if ( is_string( $content ) && preg_match( '/^https?:\/\//', $content ) ) {
|
|
$content_url = trim( $content );
|
|
if ( ! wp_http_validate_url( $content_url ) ) {
|
|
self::log_error( 'Invalid image URL (SSRF protection) for article ' . $article->id );
|
|
return false;
|
|
}
|
|
$img_response = wp_remote_get( $content_url, array(
|
|
'timeout' => 30,
|
|
'limit_response_size' => 5 * 1024 * 1024,
|
|
) );
|
|
if ( ! is_wp_error( $img_response ) ) {
|
|
return wp_remote_retrieve_body( $img_response );
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check for data array format (DALL-E style).
|
|
if ( ! empty( $data['data'][0]['b64_json'] ) ) {
|
|
$decoded = base64_decode( $data['data'][0]['b64_json'], true );
|
|
if ( false === $decoded ) {
|
|
self::log_error( 'Invalid base64 in DALL-E response for article ' . $article->id );
|
|
return false;
|
|
}
|
|
return $decoded;
|
|
}
|
|
|
|
if ( ! empty( $data['data'][0]['url'] ) ) {
|
|
$dalle_url = $data['data'][0]['url'];
|
|
if ( wp_http_validate_url( $dalle_url ) ) {
|
|
$img_response = wp_remote_get( $dalle_url, array(
|
|
'timeout' => 30,
|
|
'limit_response_size' => 5 * 1024 * 1024,
|
|
) );
|
|
if ( ! is_wp_error( $img_response ) ) {
|
|
return wp_remote_retrieve_body( $img_response );
|
|
}
|
|
} else {
|
|
self::log_error( 'Invalid DALL-E image URL (SSRF protection) for article ' . $article->id );
|
|
}
|
|
}
|
|
|
|
self::log_error( 'Could not extract image data from response for article ' . $article->id );
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Build the prompt for AI image generation.
|
|
*
|
|
* @param object $article
|
|
* @return string
|
|
*/
|
|
private static function build_image_prompt( $article ) {
|
|
$summary = ! empty( $article->ai_summary ) ? $article->ai_summary : $article->excerpt;
|
|
$tags = ! empty( $article->tags ) ? $article->tags : ( $article->categories ?? '' );
|
|
|
|
return "Generate a professional, science-themed thumbnail image for a peptide research news article. "
|
|
. "The image should be modern, clean, and suitable for a news website card layout (16:9 aspect ratio). "
|
|
. "Use a scientific aesthetic: molecular structures, laboratory elements, or abstract biotech visuals. "
|
|
. "Do NOT include any text or words in the image.\n\n"
|
|
. "Article title: " . $article->title . "\n"
|
|
. ( ! empty( $summary ) ? "Summary: " . mb_substr( $summary, 0, 200 ) . "\n" : '' )
|
|
. ( ! empty( $tags ) ? "Keywords: " . $tags . "\n" : '' );
|
|
}
|
|
|
|
/**
|
|
* Save a generated image to the WP uploads directory.
|
|
*
|
|
* @param string $image_data Raw image binary data.
|
|
* @param int $article_id
|
|
* @return string|false Relative path from uploads base, or false.
|
|
*/
|
|
private static function save_generated_image( $image_data, $article_id ) {
|
|
if ( empty( $image_data ) || strlen( $image_data ) < 1000 ) {
|
|
return false;
|
|
}
|
|
|
|
$upload_dir = wp_upload_dir();
|
|
$target_dir = $upload_dir['basedir'] . '/peptide-news-thumbs';
|
|
|
|
if ( ! file_exists( $target_dir ) ) {
|
|
wp_mkdir_p( $target_dir );
|
|
}
|
|
|
|
// Detect image type from data.
|
|
$finfo = new finfo( FILEINFO_MIME_TYPE );
|
|
$mime = $finfo->buffer( $image_data );
|
|
$ext_map = array(
|
|
'image/png' => 'png',
|
|
'image/jpeg' => 'jpg',
|
|
'image/webp' => 'webp',
|
|
'image/gif' => 'gif',
|
|
);
|
|
$extension = isset( $ext_map[ $mime ] ) ? $ext_map[ $mime ] : 'png';
|
|
|
|
$filename = 'pn-ai-' . $article_id . '.' . $extension;
|
|
$filepath = $target_dir . '/' . $filename;
|
|
|
|
$result = file_put_contents( $filepath, $image_data );
|
|
|
|
if ( false === $result ) {
|
|
self::log_error( 'Failed to save generated thumbnail: ' . $filepath );
|
|
return false;
|
|
}
|
|
|
|
// Set secure file permissions.
|
|
chmod( $filepath, 0644 );
|
|
|
|
return 'peptide-news-thumbs/' . $filename;
|
|
}
|
|
|
|
/**
|
|
* Clear all article transient caches.
|
|
*/
|
|
private static function clear_article_cache() {
|
|
global $wpdb;
|
|
$wpdb->query(
|
|
$wpdb->prepare(
|
|
"DELETE FROM {$wpdb->options}
|
|
WHERE option_name LIKE %s
|
|
OR option_name LIKE %s",
|
|
$wpdb->esc_like( '_transient_peptide_news_articles_' ) . '%',
|
|
$wpdb->esc_like( '_transient_timeout_peptide_news_articles_' ) . '%'
|
|
)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Log an error to the WordPress debug log.
|
|
*
|
|
* @param string $message
|
|
*/
|
|
private static function log_error( $message ) {
|
|
if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
|
|
error_log( '[Peptide News LLM] ' . $message );
|
|
}
|
|
}
|
|
}
|