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feat(images): retry Cloudflare NSFW-blocked prompts with a sanitized fallback

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Cloudflare's Workers AI FLUX.1 schnell content filter sometimes rejects
peptide-comic prompts as NSFW (HTTP 400, errors[].code === 3030). On
2026-04-20 this produced a silent publish-without-featured-image for
post #650 ("Semaglutide vs Tirzepatide") — the LLM-rewritten scene
tripped the filter and we had no recovery path.

New behaviour: on a 3030 response, the Cloudflare provider throws a
typed PRAutoBlogger_Image_NSFW_Blocked exception. The batch wrapper
catches it and tags the per-slot result with
`error_type: nsfw_blocked`. Image_Pipeline hands the results to a new
PRAutoBlogger_Image_NSFW_Retry helper, which reruns the blocked slot
once with a sanitized fallback prompt (title + style suffix, no LLM
rewrite). On success the retry result replaces the error entry; on a
second block, a WARNING is logged and the pipeline publishes without
that image — same terminal behaviour we had before, just explicit.

Files:

- New providers/class-image-nsfw-blocked.php — typed exception.
- providers/class-cloudflare-image-support.php — is_nsfw_error() +
  throw_if_nsfw() helpers.
- providers/class-cloudflare-image-provider.php — calls throw_if_nsfw
  inside the 4xx branch; batch catches the typed exception and marks
  the result with error_type.
- core/class-image-prompt-builder.php — new public build_fallback_prompt
  shim so the retry layer can reach the rule-based fallback without
  going through the LLM path.
- New core/class-image-nsfw-retry.php — single-shot retry helper.
- core/class-image-pipeline.php — invokes the retry between batch
  completion and per-slot processing.
- admin/class-settings-fields-extended.php — new toggle
  `prautoblogger_image_nsfw_retry` (default on) in the Images section.

Tests:

- CloudflareImageProviderTest — 3030 response throws NSFW exception;
  batch tags the per-slot result with `error_type: nsfw_blocked`.
- ImagePipelineTest — retry succeeds when provider returns a good
  result on the second call; retry is skipped when the setting is off.

Cost impact: worst-case an extra Cloudflare call per NSFW-blocked slot
(~$0.000834). Current incidence ~2% of generations; ~+$0.00002 per
generation amortized. Immaterial.

Uninstall: new option covered by the existing prautoblogger_% LIKE
sweep in uninstall.php.

Part of the v0.8.0 image bundle (issues from thread image-mime-bug).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
peptiderepo
2026-04-21 01:06:59 +07:00
parent a3ed663bae
commit fb1451c4dc
9 changed files with 420 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
includes/admin/class-settings-fields-extended.php
View File

@@ -256,6 +256,14 @@ class PRAutoBlogger_Settings_Fields_Extended {
'default' => PRAUTOBLOGGER_DEFAULT_IMAGE_STYLE_SUFFIX,
'description' => __( 'Appended to every image prompt. Controls visual look. Changing mid-run causes visible style drift.', 'prautoblogger' ),
],
[
'id' => 'prautoblogger_image_nsfw_retry',
'label' => __( 'Retry NSFW-Blocked Images', 'prautoblogger' ),
'type' => 'toggle',
'section' => 'prautoblogger_images',
'default' => '1',
'description' => __( 'When the provider rejects an image prompt as NSFW (e.g. Cloudflare code 3030), retry once with a generic fallback scene built from the article title. Disable to fail fast if the filter gets trigger-happy.', 'prautoblogger' ),
],
];
}
}

139
includes/core/class-image-nsfw-retry.php Normal file
View File

@@ -0,0 +1,139 @@
<?php
declare(strict_types=1);
/**
* Single-shot retry of NSFW-blocked image slots with a sanitized prompt.
*
* When an image provider (currently only Cloudflare Workers AI) rejects a
* prompt via its content filter, its batch result carries
* `['error_type' => 'nsfw_blocked']`. This helper reruns just the blocked
* slot once with the rule-based fallback prompt (article title + style
* suffix, no LLM rewrite) and merges the new result back into the batch.
*
* Intentionally single-retry: if the fallback is also blocked, we log a
* WARNING and leave the `['error' => ...]` entry in place so the pipeline
* proceeds to publish without a featured image (current behaviour for any
* unrecoverable image failure).
*
* Gated behind the `prautoblogger_image_nsfw_retry` setting (default on).
*
* Triggered by: PRAutoBlogger_Image_Pipeline::generate_and_attach_images.
* Dependencies: PRAutoBlogger_Image_Provider_Interface (retry HTTP call),
* PRAutoBlogger_Image_Prompt_Builder (fallback prompt),
* PRAutoBlogger_Logger (warning + info lines).
*
* @see core/class-image-pipeline.php — Sole caller.
* @see core/class-image-prompt-builder.php — Supplies the fallback prompt.
* @see providers/class-image-nsfw-blocked.php — Typed exception raised by providers.
*/
class PRAutoBlogger_Image_NSFW_Retry {
/**
* Option key for the admin toggle.
*/
private const SETTING_KEY = 'prautoblogger_image_nsfw_retry';
/** @var PRAutoBlogger_Image_Provider_Interface */
private PRAutoBlogger_Image_Provider_Interface $provider;
/** @var PRAutoBlogger_Image_Prompt_Builder */
private PRAutoBlogger_Image_Prompt_Builder $prompt_builder;
/**
* @param PRAutoBlogger_Image_Provider_Interface $provider Provider to retry against.
* @param PRAutoBlogger_Image_Prompt_Builder $prompt_builder Fallback prompt source.
*/
public function __construct(
PRAutoBlogger_Image_Provider_Interface $provider,
PRAutoBlogger_Image_Prompt_Builder $prompt_builder
) {
$this->provider = $provider;
$this->prompt_builder = $prompt_builder;
}
/**
* Whether the admin setting currently allows NSFW retries.
*
* Defaults to on. Kept as a static so callers can short-circuit before
* constructing a retry object when nothing needs retrying anyway.
*
* @return bool
*/
public static function is_enabled(): bool {
return '1' === (string) get_option( self::SETTING_KEY, '1' );
}
/**
* Replace every NSFW-blocked slot in $batch_results with a fresh result
* from a sanitized fallback prompt.
*
* Mutates $batch_results and $captions in place. Also updates the
* per-slot entry in $captions so the caller writes the fallback
* caption under the post if the retry succeeds.
*
* Side effects: up to one HTTP call per blocked slot; Logger lines
* for every retry attempt (info on success, warning on second block).
*
* @param int $post_id Target post ID (for logs).
* @param array $batch_requests Original per-slot request map.
* @param array<string, array|null> $batch_results Provider result map (mutated).
* @param array<string, string> $captions Caption map (mutated).
* @param array<string, mixed> $article_data Article data (for title).
* @param array<string, mixed>|null $source_data Source data (for title on image_b).
* @return void
*/
public function retry_blocked_slots(
int $post_id,
array $batch_requests,
array &$batch_results,
array &$captions,
array $article_data,
?array $source_data
): void {
foreach ( $batch_results as $key => $entry ) {
if ( ! is_array( $entry ) || 'nsfw_blocked' !== ( $entry['error_type'] ?? '' ) ) {
continue;
}
$title = 'image_b' === $key
? (string) ( $source_data['title'] ?? '' )
: (string) ( $article_data['post_title'] ?? $article_data['suggested_title'] ?? '' );
$fallback = $this->prompt_builder->build_fallback_prompt( $title );
PRAutoBlogger_Logger::instance()->info(
sprintf( 'NSFW retry for post %d slot "%s" with sanitized fallback prompt.', $post_id, $key ),
'image_pipeline'
);
$retry_request = [
'prompt' => $fallback['prompt'],
'width' => (int) ( $batch_requests[ $key ]['width'] ?? 0 ),
'height' => (int) ( $batch_requests[ $key ]['height'] ?? 0 ),
'options' => $batch_requests[ $key ]['options'] ?? [],
];
$retry_results = $this->provider->generate_image_batch( [ $key => $retry_request ] );
$retry_entry = $retry_results[ $key ] ?? [ 'error' => 'Retry provider returned no result.' ];
if ( isset( $retry_entry['error'] ) ) {
PRAutoBlogger_Logger::instance()->warning(
sprintf(
'NSFW retry for post %d slot "%s" also failed: %s',
$post_id,
$key,
(string) $retry_entry['error']
),
'image_pipeline'
);
// Leave the original ['error' => ...] entry so the pipeline
// publishes without this image, matching current behaviour
// for any unrecoverable image failure.
continue;
}
$batch_results[ $key ] = $retry_entry;
$captions[ $key ] = $fallback['caption'];
}
}
}

6
includes/core/class-image-pipeline.php
View File

@@ -138,6 +138,12 @@ class PRAutoBlogger_Image_Pipeline {
return $result;
}
// Single-shot retry for any slot the provider flagged as NSFW-blocked.
if ( PRAutoBlogger_Image_NSFW_Retry::is_enabled() ) {
( new PRAutoBlogger_Image_NSFW_Retry( $this->provider, $this->prompt_builder ) )
->retry_blocked_slots( $post_id, $batch_requests, $batch_results, $captions, $article_data, $source_data );
}
// Process Image A result.
$this->process_image_a( $post_id, $batch_results, $captions, $result );

48
includes/core/class-image-prompt-builder.php
View File

@@ -66,18 +66,12 @@ PROMPT;
/**
* Build a visual prompt from finished article content.
*
* Tries LLM rewriting first; falls back to rule-based synthesis on failure.
* Separates the scene description (for image gen) from the caption text
* (for insertion below the image as HTML). Appends style suffix to the
* scene-only prompt so no text is rendered inside the image.
* Tries LLM rewriting first; falls back to rule-based synthesis on
* failure. Splits scene (for image gen) from caption (HTML below the
* image) and appends the style suffix.
*
* @param array{
* post_title?: string,
* post_content?: string,
* suggested_title?: string,
* } $article_data Article data with title and HTML content.
*
* @return array{prompt: string, caption: string} Image prompt (scene + style) and caption text.
* @param array{post_title?: string, post_content?: string, suggested_title?: string} $article_data
* @return array{prompt: string, caption: string}
*/
public function build_article_prompt( array $article_data ): array {
$title = $article_data['post_title'] ?? $article_data['suggested_title'] ?? 'Product';
@@ -95,18 +89,11 @@ PROMPT;
}
/**
* Build a visual prompt from source Reddit thread data.
* Build a visual prompt from source Reddit thread data. Tries LLM
* rewriting first; falls back to rule-based synthesis on failure.
*
* Tries LLM rewriting first; falls back to rule-based synthesis on failure.
* Appends the style suffix from plugin options.
*
* @param array{
* title?: string,
* selftext?: string,
* comments?: string[],
* } $source_data Reddit source data with title and comments.
*
* @return array{prompt: string, caption: string} Image prompt (scene + style) and caption text.
* @param array{title?: string, selftext?: string, comments?: string[]} $source_data
* @return array{prompt: string, caption: string}
*/
public function build_source_prompt( array $source_data ): array {
$title = $source_data['title'] ?? 'Reddit Discussion';
@@ -257,6 +244,23 @@ PROMPT;
return $para;
}
/**
* Public entry into the rule-based fallback, used by NSFW retry to
* rebuild a provider-safe prompt from just the article title. Matches
* the return shape of build_article_prompt() / build_source_prompt().
*
* @param string $title Article or source title.
* @return array{prompt: string, caption: string}
*/
public function build_fallback_prompt( string $title ): array {
$parsed = $this->synthesize_visual_concepts_fallback( $title, '' );
$style_suffix = get_option( 'prautoblogger_image_style_suffix', PRAUTOBLOGGER_DEFAULT_IMAGE_STYLE_SUFFIX );
return [
'prompt' => trim( $parsed['scene'] . ' ' . $style_suffix ),
'caption' => $parsed['caption'],
];
}
/**
* Rule-based fallback when LLM rewriting is unavailable.
*

11
includes/providers/class-cloudflare-image-provider.php
View File

@@ -136,6 +136,7 @@ class PRAutoBlogger_Cloudflare_Image_Provider implements PRAutoBlogger_Image_Pro
if ( $status >= 400 ) {
$this->support->log_client_error( $status, $api_token, $account_id, $raw );
$this->support->throw_if_nsfw( $raw );
throw new \RuntimeException(
sprintf(
/* translators: %1$d: HTTP status, %2$s: error body. */
@@ -183,12 +184,10 @@ class PRAutoBlogger_Cloudflare_Image_Provider implements PRAutoBlogger_Image_Pro
$results = [];
foreach ( $requests as $key => $req ) {
try {
$results[ $key ] = $this->generate_image(
$req['prompt'],
$req['width'],
$req['height'],
$req['options'] ?? []
);
$results[ $key ] = $this->generate_image( $req['prompt'], $req['width'], $req['height'], $req['options'] ?? [] );
} catch ( PRAutoBlogger_Image_NSFW_Blocked $e ) {
// Tag NSFW so the pipeline's retry layer can rebuild the prompt.
$results[ $key ] = [ 'error' => $e->getMessage(), 'error_type' => 'nsfw_blocked' ];
} catch ( \Throwable $e ) {
$results[ $key ] = [ 'error' => $e->getMessage() ];
}

58
includes/providers/class-cloudflare-image-support.php
View File

@@ -111,4 +111,62 @@ class PRAutoBlogger_Cloudflare_Image_Support {
'cloudflare-image'
);
}
/**
* Cloudflare Workers AI error code for NSFW content rejection.
*
* Observed on FLUX.1 schnell on 2026-04-20 when backfilling the post
* "Semaglutide vs Tirzepatide". Documented upstream as
* `AiError: Input prompt contains NSFW content.`
*/
public const ERROR_CODE_NSFW = 3030;
/**
* Return true when the Cloudflare response body contains the NSFW
* content-filter error code (3030).
*
* The body shape is `{"errors":[{"code":3030,"message":"..."}],...}`.
* Parsing is tolerant: any JSON decode failure or missing key returns
* false, so a malformed 4xx never masquerades as NSFW.
*
* @param string $raw Raw response body from Cloudflare.
* @return bool True when at least one error entry carries code 3030.
*/
public function is_nsfw_error( string $raw ): bool {
$decoded = json_decode( $raw, true );
if ( ! is_array( $decoded ) || empty( $decoded['errors'] ) || ! is_array( $decoded['errors'] ) ) {
return false;
}
foreach ( $decoded['errors'] as $err ) {
if ( is_array( $err ) && (int) ( $err['code'] ?? 0 ) === self::ERROR_CODE_NSFW ) {
return true;
}
}
return false;
}
/**
* Throw a typed NSFW exception when the response body signals CF's
* content-filter rejection (code 3030). No-op otherwise.
*
* Centralised so callers stay at one line at the call site and so the
* exception-construction shape can't drift between call sites.
*
* @param string $raw Raw response body.
* @return void
* @throws PRAutoBlogger_Image_NSFW_Blocked When the body contains code 3030.
*/
public function throw_if_nsfw( string $raw ): void {
if ( ! $this->is_nsfw_error( $raw ) ) {
return;
}
throw new PRAutoBlogger_Image_NSFW_Blocked(
sprintf(
/* translators: %s: truncated error body. */
esc_html__( 'Cloudflare Workers AI rejected the prompt as NSFW: %s', 'prautoblogger' ),
esc_html( substr( $raw, 0, 300 ) )
),
$raw
);
}
}

45
includes/providers/class-image-nsfw-blocked.php Normal file
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@@ -0,0 +1,45 @@
<?php
declare(strict_types=1);
/**
* Exception raised when an image provider rejects a prompt as NSFW.
*
* Cloudflare Workers AI returns HTTP 400 with an `errors[].code === 3030`
* body when its content filter blocks a prompt. We catch that shape in
* the provider and raise this typed exception so the image pipeline can
* distinguish a content-filter rejection from a generic 4xx and retry
* once with a sanitized fallback prompt.
*
* Triggered by: PRAutoBlogger_Cloudflare_Image_Provider on NSFW 4xx.
* Dependencies: None.
*
* @see providers/class-cloudflare-image-provider.php — Raises this.
* @see core/class-image-nsfw-retry.php — Catches + rebuilds prompt.
* @see https://developers.cloudflare.com/workers-ai/models/flux-1-schnell/ — Upstream error codes.
*/
class PRAutoBlogger_Image_NSFW_Blocked extends \RuntimeException {
/**
* The raw upstream response body, kept verbatim for log forensics.
*
* @var string
*/
private string $upstream_body;
/**
* @param string $message Human-readable summary.
* @param string $upstream_body Raw response body from the provider.
* @param \Throwable|null $previous Optional previous exception.
*/
public function __construct( string $message, string $upstream_body = '', ?\Throwable $previous = null ) {
parent::__construct( $message, 0, $previous );
$this->upstream_body = $upstream_body;
}
/**
* @return string Raw upstream body (may be empty).
*/
public function get_upstream_body(): string {
return $this->upstream_body;
}
}