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feat: add OpenRouter image provider for higher-quality image generation

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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>
This commit is contained in:
peptiderepo
2026-04-18 09:19:13 +07:00
parent b5e91ba3a6
commit 0a68741945
11 changed files with 852 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
includes/core/class-image-pipeline.php
View File

@@ -63,19 +63,36 @@ class PRAutoBlogger_Image_Pipeline {
/**
* Construct with dependencies.
*
* @param PRAutoBlogger_Image_Provider_Interface|null $provider Optional provider (defaults to Cloudflare).
* When no provider is injected, the constructor reads the
* `prautoblogger_image_provider` setting and instantiates the
* matching concrete class ('openrouter' or 'cloudflare').
*
* @param PRAutoBlogger_Image_Provider_Interface|null $provider Optional provider override.
* @param PRAutoBlogger_Cost_Tracker|null $cost_tracker Optional cost tracker.
*/
public function __construct(
?PRAutoBlogger_Image_Provider_Interface $provider = null,
?PRAutoBlogger_Cost_Tracker $cost_tracker = null
) {
$this->provider = $provider ?? new PRAutoBlogger_Cloudflare_Image_Provider();
$this->provider = $provider ?? self::create_default_provider();
$this->prompt_builder = new PRAutoBlogger_Image_Prompt_Builder();
$this->sideloader = new PRAutoBlogger_Image_Media_Sideloader();
$this->cost_tracker = $cost_tracker ?? new PRAutoBlogger_Cost_Tracker();
}
/**
* Instantiate the image provider based on the admin setting.
*
* @return PRAutoBlogger_Image_Provider_Interface
*/
private static function create_default_provider(): PRAutoBlogger_Image_Provider_Interface {
$provider_id = (string) get_option( 'prautoblogger_image_provider', PRAUTOBLOGGER_DEFAULT_IMAGE_PROVIDER );
if ( 'openrouter' === $provider_id ) {
return new PRAutoBlogger_OpenRouter_Image_Provider();
}
return new PRAutoBlogger_Cloudflare_Image_Provider();
}
/**
* Generate and attach images to a published post.
*
@@ -190,7 +207,7 @@ class PRAutoBlogger_Image_Pipeline {
// Log the cost.
$this->cost_tracker->log_image_generation(
$image_data['cost_usd'],
'flux-1-schnell',
$image_data['model'] ?? 'unknown',
$post_id,
'image_a'
);
@@ -256,7 +273,7 @@ class PRAutoBlogger_Image_Pipeline {
// Log the cost.
$this->cost_tracker->log_image_generation(
$image_data['cost_usd'],
'flux-1-schnell',
$image_data['model'] ?? 'unknown',
$post_id,
'image_b'
);