feat: add OpenRouter image provider for higher-quality image generation
Replaces Cloudflare Workers AI (FLUX.1 schnell) as the default image provider with OpenRouter, which offers FLUX.2 Pro, Seedream 3.0, Gemini Flash Image, and GPT Image 1 at comparable or better pricing. - New provider class (3-file split: provider, pricing, support) reuses the existing OpenRouter API key and Cloudflare AI Gateway - Admin settings: new Image Provider dropdown (openrouter/cloudflare), model picker shows all available image models from both providers - Image pipeline auto-selects the configured provider at construction - Cost logging now uses actual model name instead of hardcoded flux-1-schnell - Default model changed to black-forest-labs/flux-2-pro ($0.03/image) - Unit tests for pricing resolution and provider response parsing Cost impact: FLUX.2 Pro at $0.03/image vs schnell at $0.0007/image — ~43x more expensive per image, but dramatically better quality. At 2 images/article × 1 article/day = ~$1.80/month. Seedream 3.0 ($0.003) available as a budget alternative. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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266
includes/providers/class-openrouter-image-provider.php
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266
includes/providers/class-openrouter-image-provider.php
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<?php
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declare(strict_types=1);
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/**
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* OpenRouter image provider — FLUX.2, Seedream, GPT-Image, Gemini Flash.
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*
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* Calls the standard OpenRouter chat/completions endpoint with
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* `modalities: ["image"]`. Reuses the same API key and optional
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* Cloudflare AI Gateway as the LLM provider.
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*
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* Triggered by: PRAutoBlogger_Image_Pipeline during the content generation
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* run, after editorial review, before publish. Also triggered
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* by the admin "Test Connection" action.
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* Dependencies: PRAutoBlogger_OpenRouter_Image_Support (key, parsing, retry),
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* PRAutoBlogger_OpenRouter_Config (base URL + gateway),
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* PRAutoBlogger_OpenRouter_Request_Builder (headers + cURL fix),
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* PRAutoBlogger_OpenRouter_Image_Pricing (model + cost),
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* PRAutoBlogger_Logger.
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*
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* @see interface-image-provider.php Interface this class implements.
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* @see class-openrouter-image-support.php Key lookup, response parsing, retry.
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* @see class-openrouter-image-pricing.php Cost + model helpers.
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* @see class-open-router-config.php Base URL / gateway resolution.
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* @see class-open-router-request-builder.php Header building + cURL auth filter.
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* @see class-cloudflare-image-provider.php Sibling provider; same retry pattern.
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* @see ARCHITECTURE.md External API Integrations table.
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*/
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class PRAutoBlogger_OpenRouter_Image_Provider implements PRAutoBlogger_Image_Provider_Interface {
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private const PROVIDER_ID = 'openrouter';
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private const MIN_DIMENSION_PX = 64;
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private const MAX_DIMENSION_PX = 2048;
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/** @var PRAutoBlogger_OpenRouter_Image_Pricing */
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private PRAutoBlogger_OpenRouter_Image_Pricing $pricing;
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/** @var PRAutoBlogger_OpenRouter_Image_Support */
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private PRAutoBlogger_OpenRouter_Image_Support $support;
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/** @var PRAutoBlogger_OpenRouter_Config */
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private PRAutoBlogger_OpenRouter_Config $config;
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/** @var PRAutoBlogger_OpenRouter_Request_Builder */
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private PRAutoBlogger_OpenRouter_Request_Builder $request_builder;
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public function __construct() {
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$this->pricing = new PRAutoBlogger_OpenRouter_Image_Pricing();
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$this->support = new PRAutoBlogger_OpenRouter_Image_Support();
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$this->config = new PRAutoBlogger_OpenRouter_Config();
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$this->request_builder = new PRAutoBlogger_OpenRouter_Request_Builder();
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}
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/**
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* {@inheritDoc}
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*
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* Sends a chat/completions request with modalities=["image"] and parses
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* the base64 image from the response. Retries 5xx/429 with exponential
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* backoff. 4xx (except 429) fail immediately.
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*
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* Side effects: HTTP request per attempt, Logger line per attempt.
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*
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* @throws \InvalidArgumentException If dimensions out of range or prompt empty.
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* @throws \RuntimeException On auth failure, bad response, or retry exhaustion.
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*/
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public function generate_image( string $prompt, int $width, int $height, array $options = [] ): array {
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$this->assert_valid_dimensions( $width, $height );
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$prompt = trim( $prompt );
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if ( '' === $prompt ) {
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throw new \InvalidArgumentException(
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esc_html__( 'Image prompt cannot be empty.', 'prautoblogger' )
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);
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}
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$api_key = $this->support->get_api_key();
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$model = $this->pricing->resolve_model( (string) ( $options['model'] ?? '' ) );
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$body = $this->build_request_body( $prompt, $width, $height, $model );
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$base_url = $this->config->get_api_base_url();
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$url = $base_url . '/chat/completions';
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$headers = $this->request_builder->build_headers(
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$api_key,
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$this->config->is_via_gateway(),
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0 // No caching for image gen — every call should be unique.
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);
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$curl_filter = $this->request_builder->register_curl_auth_filter(
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$headers,
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wp_parse_url( $base_url, PHP_URL_HOST ) ?: ''
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);
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$started_at = microtime( true );
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$last_error = '';
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try {
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for ( $attempt = 1; $attempt <= PRAUTOBLOGGER_MAX_RETRIES; $attempt++ ) {
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$response = wp_remote_post( $url, [
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'timeout' => PRAUTOBLOGGER_API_TIMEOUT_SECONDS,
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'headers' => $headers,
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'body' => wp_json_encode( $body ),
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] );
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if ( is_wp_error( $response ) ) {
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$last_error = $response->get_error_message();
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$this->support->log_retry( $attempt, 'network', $last_error );
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$this->support->backoff( $attempt );
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continue;
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}
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$status = (int) wp_remote_retrieve_response_code( $response );
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$raw = (string) wp_remote_retrieve_body( $response );
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if ( 429 === $status || $status >= 500 ) {
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$last_error = sprintf( 'HTTP %d: %s', $status, substr( $raw, 0, 300 ) );
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$this->support->log_retry( $attempt, (string) $status, $last_error );
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if ( $attempt < PRAUTOBLOGGER_MAX_RETRIES ) {
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$retry_after = (int) wp_remote_retrieve_header( $response, 'retry-after' );
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$this->support->backoff( $attempt, $retry_after );
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}
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continue;
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}
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if ( $status >= 400 ) {
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PRAutoBlogger_Logger::instance()->error(
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sprintf( 'OpenRouter image gen HTTP %d: %s', $status, substr( $raw, 0, 300 ) ),
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'openrouter-image'
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);
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throw new \RuntimeException(
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sprintf(
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esc_html__( 'OpenRouter image error (HTTP %1$d): %2$s', 'prautoblogger' ),
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$status,
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esc_html( substr( $raw, 0, 300 ) )
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)
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);
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}
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$image_bytes = $this->support->extract_image_bytes( $raw );
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return [
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'bytes' => $image_bytes,
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'mime_type' => 'image/png',
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'width' => $width,
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'height' => $height,
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'model' => $model,
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'seed' => null,
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'cost_usd' => $this->pricing->estimate_cost( $width, $height, $model ),
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'latency_ms' => (int) ( ( microtime( true ) - $started_at ) * 1000 ),
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];
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}
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} finally {
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remove_action( 'http_api_curl', $curl_filter, 99 );
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}
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throw new \RuntimeException(
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sprintf(
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esc_html__( 'OpenRouter image gen failed after %1$d attempts. Last error: %2$s', 'prautoblogger' ),
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PRAUTOBLOGGER_MAX_RETRIES,
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esc_html( $last_error )
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)
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);
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}
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/** {@inheritDoc} */
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public function estimate_cost( int $width, int $height, array $options = [] ): float {
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$model = $this->pricing->resolve_model( (string) ( $options['model'] ?? '' ) );
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return $this->pricing->estimate_cost( $width, $height, $model );
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}
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/** {@inheritDoc} */
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public function get_provider_name(): string {
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return self::PROVIDER_ID;
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}
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/**
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* Verify credentials by calling OpenRouter's /auth/key endpoint.
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*
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* {@inheritDoc}
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*/
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public function validate_credentials_detailed(): array {
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try {
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$api_key = $this->support->get_api_key();
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} catch ( \RuntimeException $e ) {
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return [
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'status' => 'error',
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'message' => $e->getMessage(),
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];
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}
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$response = wp_remote_get( 'https://openrouter.ai/api/v1/auth/key', [
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'timeout' => 15,
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'headers' => [ 'Authorization' => 'Bearer ' . $api_key ],
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] );
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if ( is_wp_error( $response ) ) {
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return [
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'status' => 'error',
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'message' => __( 'Could not reach OpenRouter API.', 'prautoblogger' ),
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'debug' => $response->get_error_message(),
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];
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}
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$status = (int) wp_remote_retrieve_response_code( $response );
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if ( 200 === $status ) {
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return [
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'status' => 'ok',
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'message' => __( 'OpenRouter API key valid. Image generation ready.', 'prautoblogger' ),
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];
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}
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return [
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'status' => 'error',
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'message' => sprintf( __( 'OpenRouter returned HTTP %d.', 'prautoblogger' ), $status ),
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'debug' => substr( (string) wp_remote_retrieve_body( $response ), 0, 200 ),
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];
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}
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/**
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* Build the chat/completions request body for image generation.
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*
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* @param string $prompt Image generation prompt.
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* @param int $width Target width.
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* @param int $height Target height.
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* @param string $model Resolved model id.
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* @return array<string, mixed>
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*/
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private function build_request_body( string $prompt, int $width, int $height, string $model ): array {
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$gcd = $this->support->gcd( $width, $height );
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$ar_w = (int) ( $width / $gcd );
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$ar_h = (int) ( $height / $gcd );
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$aspect = $ar_w . ':' . $ar_h;
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return [
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'model' => $model,
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'messages' => [
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[
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'role' => 'user',
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'content' => $prompt,
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],
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],
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'modalities' => [ 'image' ],
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'image_config' => [
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'aspect_ratio' => $aspect,
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],
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];
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}
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/**
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* Enforce the interface's dimension contract.
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*
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* @param int $width Width in pixels.
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* @param int $height Height in pixels.
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* @throws \InvalidArgumentException If outside [MIN, MAX].
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*/
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private function assert_valid_dimensions( int $width, int $height ): void {
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if (
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$width < self::MIN_DIMENSION_PX || $width > self::MAX_DIMENSION_PX ||
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$height < self::MIN_DIMENSION_PX || $height > self::MAX_DIMENSION_PX
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) {
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throw new \InvalidArgumentException(
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sprintf(
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esc_html__( 'Image dimensions %1$dx%2$d outside supported range (%3$d–%4$d px).', 'prautoblogger' ),
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$width, $height, self::MIN_DIMENSION_PX, self::MAX_DIMENSION_PX
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)
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);
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}
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}
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}
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