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fix: strip LLM output artifacts (code fences, HTML wrappers) before saving posts

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LLMs sometimes ignore format instructions and wrap content in markdown
code fences or full HTML document structures. Added sanitize_llm_content()
to the publisher that strips these before wp_kses_post() runs, preventing
raw ```html blocks and <html><head><body> wrappers from reaching post_content.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
peptiderepo
2026-04-12 18:19:09 +07:00
parent d9985f6dc2
commit 03074180d4
1 changed files with 42 additions and 1 deletions
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43
includes/core/class-publisher.php
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@@ -85,7 +85,7 @@ class PRAutoBlogger_Publisher {
): int {
$post_data = [
'post_title' => sanitize_text_field( $idea->get_suggested_title() ),
'post_content' => wp_kses_post( $content ),
'post_content' => wp_kses_post( $this->sanitize_llm_content( $content ) ),
'post_status' => $post_status,
'post_type' => 'post',
'post_author' => $this->get_default_author_id(),
@@ -247,6 +247,47 @@ class PRAutoBlogger_Publisher {
}
}
/**
* Strip common LLM output artifacts from generated content.
*
* LLMs sometimes ignore format instructions and wrap content in markdown
* code fences (```html ... ```) or full HTML document structures
* (<html><head><body>). This method strips those wrappers so only clean
* article-body HTML reaches WordPress.
*
* @param string $content Raw LLM output.
*
* @return string Cleaned HTML suitable for post_content.
*/
private function sanitize_llm_content( string $content ): string {
$content = trim( $content );
// Strip markdown code fences: ```html ... ``` or ``` ... ```
// Handles optional language identifier after opening fence.
if ( preg_match( '/^```(?:\w+)?\s*\n(.*?)```\s*$/s', $content, $matches ) ) {
$content = trim( $matches[1] );
}
// Strip full HTML document wrappers: <html>...<body>content</body>...</html>
// Extract only the <body> inner content.
if ( preg_match( '/<body[^>]*>(.*)<\/body>/is', $content, $matches ) ) {
$content = trim( $matches[1] );
}
// Remove stray <html>, </html>, <head>...</head>, <body>, </body> tags
// in case they appear without a proper document structure.
$content = preg_replace( '/<\/?(html|head|body|meta|title|!DOCTYPE)[^>]*>/i', '', $content );
// Remove leftover <link> and <style> tags that belong in <head>, not post content.
$content = preg_replace( '/<link\s[^>]*>/i', '', $content );
$content = preg_replace( '/<style[^>]*>.*?<\/style>/is', '', $content );
// Collapse any resulting excess whitespace (multiple blank lines → single).
$content = preg_replace( '/\n{3,}/', "\n\n", $content );
return trim( $content );
}
/**
* Get the default author ID for generated posts.
*