| 1 |
<?php |
| 2 |
|
| 3 |
/** |
| 4 |
* Image SEO Manager Class |
| 5 |
* |
| 6 |
* Manages image-specific SEO settings including automatic |
| 7 |
* ALT and TITLE attribute management. |
| 8 |
* |
| 9 |
* @package ThinkRank |
| 10 |
* @subpackage SEO |
| 11 |
* @since 1.0.0 |
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*/ |
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|
| 14 |
declare(strict_types=1); |
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|
| 16 |
namespace ThinkRank\SEO; |
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|
| 18 |
// Prevent direct access |
| 19 |
if (!defined('ABSPATH')) { |
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exit; |
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} |
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|
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/** |
| 24 |
* Image SEO Manager Class |
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* |
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* Handles image attribute optimization and settings management. |
| 27 |
* |
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* @since 1.0.0 |
| 29 |
*/ |
| 30 |
class Image_SEO_Manager extends Abstract_SEO_Manager { |
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|
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/** |
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* Accepted values for the `alt_source` setting. |
| 34 |
* |
| 35 |
* Single source of truth for the schema's enum, the REST arg constraint and |
| 36 |
* validate_settings(), so the three cannot disagree about what is legal. |
| 37 |
* |
| 38 |
* @since 1.29.1 |
| 39 |
* @var string[] |
| 40 |
*/ |
| 41 |
public const ALT_SOURCES = ['template', 'ai']; |
| 42 |
|
| 43 |
/** |
| 44 |
* Memoized site separator symbol. |
| 45 |
* |
| 46 |
* Resolved once per request rather than on every image processed during |
| 47 |
* the_content, since the separator is a site-wide option. |
| 48 |
* |
| 49 |
* @since 1.16.0 |
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* @var string|null |
| 51 |
*/ |
| 52 |
private ?string $separator = null; |
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|
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/** |
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* Constructor |
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* |
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* @since 1.0.0 |
| 58 |
*/ |
| 59 |
public function __construct() { |
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parent::__construct('image_seo'); |
| 61 |
} |
| 62 |
|
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/** |
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* Validate SEO settings (implements interface) |
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* |
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* @since 1.0.0 |
| 67 |
* |
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* @param array $settings Settings array to validate |
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* @return array Validation results |
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*/ |
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public function validate_settings(array $settings): array { |
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$validation = [ |
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'valid' => true, |
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'errors' => [], |
| 75 |
'warnings' => [], |
| 76 |
'suggestions' => [], |
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'score' => 100 |
| 78 |
]; |
| 79 |
|
| 80 |
$boolean_fields = ['add_missing_alt', 'add_missing_title', 'save_alt_to_media', 'auto_fill_on_upload', 'media_alt_overwrite']; |
| 81 |
foreach ($boolean_fields as $field) { |
| 82 |
if (isset($settings[$field]) && !is_bool($settings[$field])) { |
| 83 |
$validation['errors'][] = sprintf('%s must be a boolean value', $field); |
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$validation['valid'] = false; |
| 85 |
} |
| 86 |
} |
| 87 |
|
| 88 |
$string_fields = ['alt_format', 'title_format']; |
| 89 |
foreach ($string_fields as $field) { |
| 90 |
if (isset($settings[$field]) && !is_string($settings[$field])) { |
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$validation['errors'][] = sprintf('%s must be a string', $field); |
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$validation['valid'] = false; |
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} |
| 94 |
} |
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|
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// The schema declares alt_source as an enum but nothing used to check |
| 97 |
// it, so any string persisted. The consumer falls back to the template |
| 98 |
// path on an unknown value, which hid the drift rather than surfacing |
| 99 |
// it — the settings screen just had no option to select (#323). |
| 100 |
if (isset($settings['alt_source']) && !in_array($settings['alt_source'], self::ALT_SOURCES, true)) { |
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$validation['errors'][] = sprintf( |
| 102 |
'alt_source must be one of: %s', |
| 103 |
implode(', ', self::ALT_SOURCES) |
| 104 |
); |
| 105 |
$validation['valid'] = false; |
| 106 |
} |
| 107 |
|
| 108 |
return $validation; |
| 109 |
} |
| 110 |
|
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/** |
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* Get output data for frontend rendering (implements interface) |
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* |
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* @since 1.0.0 |
| 115 |
* |
| 116 |
* @param string $context_type The context type |
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* @param int|null $context_id Optional. Context ID |
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* @return array Output data ready for frontend rendering |
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*/ |
| 120 |
public function get_output_data(string $context_type, ?int $context_id): array { |
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return $this->get_settings($context_type, $context_id); |
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} |
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|
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/** |
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* Get default settings for a context type (implements interface) |
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* |
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* @since 1.0.0 |
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* |
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* @param string $context_type The context type to get defaults for |
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* @return array Default settings array |
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*/ |
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/** |
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* Images per batch when alt text comes from the vision model. |
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* |
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* Each one is a paid call of a few seconds; 10 keeps a batch inside a |
| 136 |
* normal PHP timeout and keeps the spend per click predictable. |
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* |
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* @since 1.28.0 |
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* @var int |
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*/ |
| 141 |
private const AI_BATCH_LIMIT = 10; |
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|
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public function get_default_settings(string $context_type): array { |
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return [ |
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'add_missing_alt' => false, |
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'alt_format' => '%filename%', |
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'add_missing_title' => false, |
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'title_format' => '%title% %separator% %sitename%', |
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// Media Library alt persistence (writes _wp_attachment_image_alt) |
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'save_alt_to_media' => false, |
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'auto_fill_on_upload' => false, |
| 152 |
'media_alt_overwrite' => false, |
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// 'template' rewrites the filename; 'ai' looks at the picture. |
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// Defaults to template because AI costs the user money per image. |
| 155 |
'alt_source' => 'template', |
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]; |
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} |
| 158 |
|
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/** |
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* Get settings schema definition (implements interface) |
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* |
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* @since 1.0.0 |
| 163 |
* |
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* @param string $context_type The context type to get schema for |
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* @return array Settings schema definition |
| 166 |
*/ |
| 167 |
public function get_settings_schema(string $context_type): array { |
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return [ |
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'add_missing_alt' => [ |
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'type' => 'boolean', |
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'title' => __('Add Missing Alt Attributes', 'thinkrank'), |
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'description' => __('Automatically add ALT attributes to images if they are missing.', 'thinkrank'), |
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'default' => false |
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], |
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'alt_format' => [ |
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'type' => 'string', |
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'title' => __('Alt attribute format', 'thinkrank'), |
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'description' => __('The format to use for automatically generated ALT attributes.', 'thinkrank'), |
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'default' => '%filename%' |
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], |
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'add_missing_title' => [ |
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'type' => 'boolean', |
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'title' => __('Add Missing Title Attributes', 'thinkrank'), |
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'description' => __('Automatically add TITLE attributes to images if they are missing.', 'thinkrank'), |
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'default' => false |
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], |
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'title_format' => [ |
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'type' => 'string', |
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'title' => __('Title attribute format', 'thinkrank'), |
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'description' => __('The format to use for automatically generated TITLE attributes.', 'thinkrank'), |
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'default' => '%title% %separator% %sitename%' |
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], |
| 193 |
'alt_source' => [ |
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'type' => 'string', |
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'title' => __('Alt text source', 'thinkrank'), |
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'description' => __('“Template” builds alt text from the filename and title. “AI” looks at the image itself and describes what is in it — this uses your AI provider key and costs one call per image.', 'thinkrank'), |
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'default' => 'template', |
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'enum' => self::ALT_SOURCES |
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], |
| 200 |
'save_alt_to_media' => [ |
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'type' => 'boolean', |
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'title' => __('Save alt text to the Media Library', 'thinkrank'), |
| 203 |
'description' => __('Persist generated alt text onto the attachment record so it works everywhere, not just in rendered content.', 'thinkrank'), |
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'default' => false |
| 205 |
], |
| 206 |
'auto_fill_on_upload' => [ |
| 207 |
'type' => 'boolean', |
| 208 |
'title' => __('Fill alt text on upload', 'thinkrank'), |
| 209 |
'description' => __('When a new image is uploaded, automatically save generated alt text to the Media Library.', 'thinkrank'), |
| 210 |
'default' => false |
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], |
| 212 |
'media_alt_overwrite' => [ |
| 213 |
'type' => 'boolean', |
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'title' => __('Overwrite existing alt text', 'thinkrank'), |
| 215 |
'description' => __('Replace alt text that is already set, instead of only filling images that are missing it.', 'thinkrank'), |
| 216 |
'default' => false |
| 217 |
] |
| 218 |
]; |
| 219 |
} |
| 220 |
|
| 221 |
/** |
| 222 |
* Process content and inject missing image attributes |
| 223 |
* |
| 224 |
* @since 1.0.0 |
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* @param string $content The content to process |
| 226 |
* @return string Processed content |
| 227 |
*/ |
| 228 |
public function process_content(string $content, $post_id = null): string { |
| 229 |
$settings = $this->get_settings('site'); |
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|
| 231 |
if (empty($settings['add_missing_alt']) && empty($settings['add_missing_title'])) { |
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return $content; |
| 233 |
} |
| 234 |
|
| 235 |
static $count = 0; |
| 236 |
$post_id ??= get_the_ID(); |
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$id_to_pass = is_int($post_id) ? $post_id : 0; |
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|
| 239 |
// Use regex for high performance, but careful with HTML structure |
| 240 |
return preg_replace_callback('/<img([^>]+)>/i', function ($matches) use ($settings, &$count, $id_to_pass) { |
| 241 |
$count++; |
| 242 |
$img_tag = $matches[0]; |
| 243 |
$attributes_str = $matches[1]; |
| 244 |
|
| 245 |
// Parse attributes (keys lower-cased; quoted and unquoted values supported) |
| 246 |
$attributes = $this->parse_attributes($attributes_str); |
| 247 |
|
| 248 |
$alt_missing = !empty($settings['add_missing_alt']) && trim((string) ($attributes['alt'] ?? '')) === ''; |
| 249 |
$title_missing = !empty($settings['add_missing_title']) && trim((string) ($attributes['title'] ?? '')) === ''; |
| 250 |
|
| 251 |
// Nothing to inject on this image — skip before any source/attachment work. |
| 252 |
if (!$alt_missing && !$title_missing) { |
| 253 |
return $img_tag; |
| 254 |
} |
| 255 |
|
| 256 |
// Resolve the real image source. Lazy-load markup keeps the true URL in a |
| 257 |
// data-* attribute while `src` is empty or a placeholder/data-URI. |
| 258 |
$src = $this->resolve_image_src($attributes); |
| 259 |
|
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// No resolvable source (spacers, tracking pixels, pure placeholders) — nothing |
| 261 |
// meaningful to describe, and nothing to derive %filename% from either. |
| 262 |
if ($src === '') { |
| 263 |
return $img_tag; |
| 264 |
} |
| 265 |
|
| 266 |
// Resolve the attachment ID only when a format that we're about to apply |
| 267 |
// actually references attachment metadata (%image_title% / %image_caption%). |
| 268 |
// attachment_url_to_postid() is a DB query, so avoid it for the common |
| 269 |
// filename-based formats and for images that need no injection. |
| 270 |
$needs_attachment = |
| 271 |
($alt_missing && $this->format_uses_attachment($settings['alt_format'] ?? '')) || |
| 272 |
($title_missing && $this->format_uses_attachment($settings['title_format'] ?? '')); |
| 273 |
$attachment_id = $needs_attachment ? $this->url_to_attachment_id($src) : 0; |
| 274 |
|
| 275 |
// Handle ALT attribute |
| 276 |
if ($alt_missing) { |
| 277 |
$alt_val = $this->generate_attribute_value($settings['alt_format'] ?? '', $attachment_id, $id_to_pass, $count, $src); |
| 278 |
if ($alt_val !== '') { |
| 279 |
$img_tag = $this->inject_attribute($img_tag, 'alt', $alt_val, isset($attributes['alt'])); |
| 280 |
} |
| 281 |
} |
| 282 |
|
| 283 |
// Handle TITLE attribute |
| 284 |
if ($title_missing) { |
| 285 |
$title_val = $this->generate_attribute_value($settings['title_format'] ?? '', $attachment_id, $id_to_pass, $count, $src); |
| 286 |
if ($title_val !== '') { |
| 287 |
$img_tag = $this->inject_attribute($img_tag, 'title', $title_val, isset($attributes['title'])); |
| 288 |
} |
| 289 |
} |
| 290 |
|
| 291 |
return $img_tag; |
| 292 |
}, $content); |
| 293 |
} |
| 294 |
|
| 295 |
/** |
| 296 |
* Parse an <img> attribute string into a lower-cased key => value map. |
| 297 |
* |
| 298 |
* Handles double-quoted, single-quoted and unquoted attribute values so that |
| 299 |
* existing attributes (e.g. an unquoted `alt=Something`) are correctly detected |
| 300 |
* and not duplicated. Attribute names are normalised to lower-case so uppercase |
| 301 |
* markup (`SRC=`, `ALT=`) is recognised. |
| 302 |
* |
| 303 |
* @since 1.19.1 |
| 304 |
* @param string $attributes_str The raw attribute portion of the tag. |
| 305 |
* @return array<string,string> Lower-cased attribute name => value. |
| 306 |
*/ |
| 307 |
private function parse_attributes(string $attributes_str): array { |
| 308 |
$matched = preg_match_all( |
| 309 |
'/([a-zA-Z][a-zA-Z0-9:-]*)\s*=\s*(?:"([^"]*)"|\'([^\']*)\'|([^\s"\'>]+))/', |
| 310 |
$attributes_str, |
| 311 |
$matches, |
| 312 |
PREG_SET_ORDER |
| 313 |
); |
| 314 |
|
| 315 |
if (!$matched) { |
| 316 |
return []; |
| 317 |
} |
| 318 |
|
| 319 |
$attributes = []; |
| 320 |
foreach ($matches as $m) { |
| 321 |
$key = strtolower($m[1]); |
| 322 |
|
| 323 |
if (isset($m[2]) && $m[2] !== '') { |
| 324 |
$value = $m[2]; |
| 325 |
} elseif (isset($m[3]) && $m[3] !== '') { |
| 326 |
$value = $m[3]; |
| 327 |
} elseif (isset($m[4]) && $m[4] !== '') { |
| 328 |
$value = $m[4]; |
| 329 |
} else { |
| 330 |
$value = ''; |
| 331 |
} |
| 332 |
|
| 333 |
$attributes[$key] = $value; |
| 334 |
} |
| 335 |
|
| 336 |
return $attributes; |
| 337 |
} |
| 338 |
|
| 339 |
/** |
| 340 |
* Resolve a usable image source from the parsed attributes. |
| 341 |
* |
| 342 |
* Prefers `src`, but falls back to common lazy-load attributes when `src` is |
| 343 |
* empty or a `data:` URI placeholder, so generated alt/title reflect the real |
| 344 |
* image rather than a base64 blob. |
| 345 |
* |
| 346 |
* @since 1.19.1 |
| 347 |
* @param array<string,string> $attributes Parsed attributes. |
| 348 |
* @return string The resolved source URL, or '' if none is usable. |
| 349 |
*/ |
| 350 |
private function resolve_image_src(array $attributes): string { |
| 351 |
$candidates = ['src', 'data-src', 'data-lazy-src', 'data-original', 'data-lazy']; |
| 352 |
|
| 353 |
foreach ($candidates as $attr) { |
| 354 |
$value = trim((string) ($attributes[$attr] ?? '')); |
| 355 |
|
| 356 |
if ($value === '' || stripos($value, 'data:') === 0) { |
| 357 |
continue; |
| 358 |
} |
| 359 |
|
| 360 |
return $value; |
| 361 |
} |
| 362 |
|
| 363 |
return ''; |
| 364 |
} |
| 365 |
|
| 366 |
/** |
| 367 |
* Whether a format string references attachment-only metadata tokens. |
| 368 |
* |
| 369 |
* Used to decide if an attachment lookup (a DB query) is actually needed; |
| 370 |
* filename/site/title/count tokens do not require the attachment record. |
| 371 |
* |
| 372 |
* @since 1.19.1 |
| 373 |
* @param string $format The format string. |
| 374 |
* @return bool |
| 375 |
*/ |
| 376 |
private function format_uses_attachment(string $format): bool { |
| 377 |
return strpos($format, '%image_title%') !== false |
| 378 |
|| strpos($format, '%image_caption%') !== false; |
| 379 |
} |
| 380 |
|
| 381 |
/** |
| 382 |
* Resolve an attachment ID from a source URL, memoized per request. |
| 383 |
* |
| 384 |
* `attachment_url_to_postid()` issues its own DB query, so repeated identical |
| 385 |
* URLs on a page (galleries, duplicated images) are cached here. |
| 386 |
* |
| 387 |
* @since 1.19.1 |
| 388 |
* @param string $src Source URL. |
| 389 |
* @return int Attachment ID, or 0 if not a media-library image. |
| 390 |
*/ |
| 391 |
private function url_to_attachment_id(string $src): int { |
| 392 |
if ($src === '') { |
| 393 |
return 0; |
| 394 |
} |
| 395 |
|
| 396 |
static $cache = []; |
| 397 |
if (!array_key_exists($src, $cache)) { |
| 398 |
$cache[$src] = attachment_url_to_postid($src); |
| 399 |
} |
| 400 |
|
| 401 |
return $cache[$src]; |
| 402 |
} |
| 403 |
|
| 404 |
/** |
| 405 |
* Inject (or replace an empty) alt/title attribute on a single <img> tag. |
| 406 |
* |
| 407 |
* When replacing, the pattern is anchored to a whitespace/tag boundary and |
| 408 |
* limited to one occurrence so it can never clobber a `data-alt`/`data-title` |
| 409 |
* (or any `*-alt`/`*-title`) attribute. A callback is used for the replacement |
| 410 |
* so `$` / `\` in the value are never treated as backreferences. Insertion is |
| 411 |
* case-insensitive on the tag opener so uppercase `<IMG>` is handled. |
| 412 |
* |
| 413 |
* @since 1.19.1 |
| 414 |
* @param string $img_tag The full <img> tag. |
| 415 |
* @param string $name Attribute name ('alt' or 'title'). |
| 416 |
* @param string $value Unescaped attribute value. |
| 417 |
* @param bool $replace Whether an (empty) attribute already exists to replace. |
| 418 |
* @return string The modified tag. |
| 419 |
*/ |
| 420 |
private function inject_attribute(string $img_tag, string $name, string $value, bool $replace): string { |
| 421 |
$attr = $name . '="' . esc_attr($value) . '"'; |
| 422 |
|
| 423 |
if ($replace) { |
| 424 |
return preg_replace_callback( |
| 425 |
'/(^|\s)' . preg_quote($name, '/') . '\s*=\s*(["\'])[^"\']*\2/i', |
| 426 |
static function ($m) use ($attr) { |
| 427 |
return $m[1] . $attr; |
| 428 |
}, |
| 429 |
$img_tag, |
| 430 |
1 |
| 431 |
); |
| 432 |
} |
| 433 |
|
| 434 |
return preg_replace_callback( |
| 435 |
'/<img\b/i', |
| 436 |
static function ($m) use ($attr) { |
| 437 |
return $m[0] . ' ' . $attr; |
| 438 |
}, |
| 439 |
$img_tag, |
| 440 |
1 |
| 441 |
); |
| 442 |
} |
| 443 |
|
| 444 |
/** |
| 445 |
* Generate attribute value based on format and context |
| 446 |
* |
| 447 |
* @since 1.0.0 |
| 448 |
* @param string $format The format string |
| 449 |
* @param int $attachment_id Attachment ID |
| 450 |
* @param int $post_id Current Post ID |
| 451 |
* @param int $count Image counter |
| 452 |
* @param string $src Image source URL |
| 453 |
* @return string Generated value |
| 454 |
*/ |
| 455 |
private function generate_attribute_value(string $format, int $attachment_id, int $post_id, int $count, string $src): string { |
| 456 |
$replacements = [ |
| 457 |
'%site_title%' => get_bloginfo('name'), |
| 458 |
'%sitename%' => get_bloginfo('name'), |
| 459 |
// Empty, not the site name. The segment collapsing below drops an |
| 460 |
// unresolved token together with its separator, and the default |
| 461 |
// title_format already ends in %sitename% — substituting the site |
| 462 |
// name here printed it twice ("Site Name | Site Name") on every |
| 463 |
// image processed outside the loop (widgets, page builders, FSE). |
| 464 |
'%title%' => $post_id > 0 ? get_the_title($post_id) : '', |
| 465 |
'%count%' => (string) $count, |
| 466 |
'%filename%' => '', |
| 467 |
'%image_title%' => '', |
| 468 |
'%image_caption%' => '', |
| 469 |
]; |
| 470 |
|
| 471 |
// Get filename from src |
| 472 |
if ($src) { |
| 473 |
$filename = pathinfo($src, PATHINFO_FILENAME); |
| 474 |
$replacements['%filename%'] = str_replace(['-', '_'], ' ', $filename); |
| 475 |
} |
| 476 |
|
| 477 |
// Get attachment data if ID exists |
| 478 |
if ($attachment_id) { |
| 479 |
$attachment = get_post($attachment_id); |
| 480 |
if ($attachment) { |
| 481 |
$replacements['%image_title%'] = $attachment->post_title; |
| 482 |
$replacements['%image_caption%'] = $attachment->post_excerpt; |
| 483 |
} |
| 484 |
} |
| 485 |
|
| 486 |
// Apply replacements for every token except the separator. |
| 487 |
$value = str_replace(array_keys($replacements), array_values($replacements), $format); |
| 488 |
|
| 489 |
// Split on the separator tokens, drop segments that resolved to empty, then |
| 490 |
// re-join with the separator symbol. This prevents orphaned/leading/trailing |
| 491 |
// separators such as "| Site Name" when a token (e.g. %filename%) is empty. |
| 492 |
$segments = preg_split('/%sep(?:arator)?%/', $value); |
| 493 |
$segments = array_filter( |
| 494 |
array_map('trim', $segments), |
| 495 |
static function ($segment) { |
| 496 |
return $segment !== ''; |
| 497 |
} |
| 498 |
); |
| 499 |
$value = implode(' ' . $this->get_separator() . ' ', $segments); |
| 500 |
|
| 501 |
// Clean up double spaces if any |
| 502 |
$value = preg_replace('/\s+/', ' ', $value); |
| 503 |
|
| 504 |
return trim($value); |
| 505 |
} |
| 506 |
|
| 507 |
/** |
| 508 |
* Get site separator |
| 509 |
* |
| 510 |
* @since 1.0.0 |
| 511 |
* @return string |
| 512 |
*/ |
| 513 |
private function get_separator(): string { |
| 514 |
if ($this->separator === null) { |
| 515 |
$this->separator = Site_Identity_Manager::get_active_separator_symbol(); |
| 516 |
} |
| 517 |
return $this->separator; |
| 518 |
} |
| 519 |
|
| 520 |
// ───────────────────────────────────────────────────────────────────── |
| 521 |
// Media Library alt-text persistence (writes _wp_attachment_image_alt) |
| 522 |
// ───────────────────────────────────────────────────────────────────── |
| 523 |
|
| 524 |
/** |
| 525 |
* Generate and save alt text onto a single attachment's Media Library record. |
| 526 |
* |
| 527 |
* Uses the same `alt_format` token pipeline as output injection, so the value |
| 528 |
* matches what the front-end filter would have produced. In this context |
| 529 |
* `%title%` and `%image_title%` resolve to the attachment's own title. |
| 530 |
* |
| 531 |
* @since 1.19.1 |
| 532 |
* @param int $attachment_id The attachment ID. |
| 533 |
* @param bool $overwrite When false, images that already have alt text are left untouched. |
| 534 |
* @return bool True when the attachment now has the generated alt text; false when skipped or on failure. |
| 535 |
*/ |
| 536 |
public function fill_attachment_alt(int $attachment_id, bool $overwrite = false): bool { |
| 537 |
if (!wp_attachment_is_image($attachment_id)) { |
| 538 |
return false; |
| 539 |
} |
| 540 |
|
| 541 |
$existing = (string) get_post_meta($attachment_id, '_wp_attachment_image_alt', true); |
| 542 |
|
| 543 |
// Non-destructive by default: never clobber hand-written alt text. |
| 544 |
if (!$overwrite && trim($existing) !== '') { |
| 545 |
return false; |
| 546 |
} |
| 547 |
|
| 548 |
$settings = $this->get_settings('site'); |
| 549 |
$format = $settings['alt_format'] ?? '%filename%'; |
| 550 |
$src = (string) wp_get_attachment_url($attachment_id); |
| 551 |
|
| 552 |
$value = ''; |
| 553 |
|
| 554 |
// AI describes the picture; the template can only rewrite its filename. |
| 555 |
// Falls back to the template on any failure so a provider outage |
| 556 |
// degrades to the old behaviour instead of leaving images bare. |
| 557 |
if ('ai' === ($settings['alt_source'] ?? 'template')) { |
| 558 |
$value = $this->generate_ai_alt($attachment_id); |
| 559 |
} |
| 560 |
|
| 561 |
if ('' === $value) { |
| 562 |
// Pass the attachment ID as the post context so %title% falls back to the |
| 563 |
// attachment's own title (there is no surrounding post here). |
| 564 |
$value = sanitize_text_field( |
| 565 |
$this->generate_attribute_value($format, $attachment_id, $attachment_id, 0, $src) |
| 566 |
); |
| 567 |
} |
| 568 |
|
| 569 |
if ($value === '') { |
| 570 |
return false; |
| 571 |
} |
| 572 |
|
| 573 |
if ($existing === $value) { |
| 574 |
// Already correct — treat as success without a redundant write. |
| 575 |
return true; |
| 576 |
} |
| 577 |
|
| 578 |
return update_post_meta($attachment_id, '_wp_attachment_image_alt', $value) !== false; |
| 579 |
} |
| 580 |
|
| 581 |
/** |
| 582 |
* Describe an attachment with the vision model. |
| 583 |
* |
| 584 |
* Never throws: alt text generation runs in batches over a whole media |
| 585 |
* library, and one unreadable image or a rate-limit blip must not abort |
| 586 |
* the run. Returns '' so the caller falls back to the template. |
| 587 |
* |
| 588 |
* @since 1.28.0 |
| 589 |
* @param int $attachment_id Attachment to describe. |
| 590 |
* @return string Alt text, or '' when unavailable. |
| 591 |
*/ |
| 592 |
private function generate_ai_alt(int $attachment_id): string { |
| 593 |
try { |
| 594 |
$vision = new \ThinkRank\AI\Vision_Client(); |
| 595 |
|
| 596 |
if (!$vision->is_available()) { |
| 597 |
return ''; |
| 598 |
} |
| 599 |
|
| 600 |
// The parent post's title disambiguates images that are visually |
| 601 |
// ambiguous on their own (a generic chart, a product on white). |
| 602 |
$context = ''; |
| 603 |
$parent = (int) get_post_field('post_parent', $attachment_id); |
| 604 |
if ($parent > 0) { |
| 605 |
$context = (string) get_the_title($parent); |
| 606 |
} |
| 607 |
|
| 608 |
return sanitize_text_field($vision->describe_attachment($attachment_id, $context)); |
| 609 |
} catch (\Throwable $e) { |
| 610 |
return ''; |
| 611 |
} |
| 612 |
} |
| 613 |
|
| 614 |
/** |
| 615 |
* Fill alt text across the Media Library in a single batch. |
| 616 |
* |
| 617 |
* Iterates images by ascending ID using offset/limit so callers can page |
| 618 |
* through large libraries without exhausting memory or hitting timeouts. |
| 619 |
* |
| 620 |
* @since 1.19.1 |
| 621 |
* @param array $args { |
| 622 |
* @type int $offset Starting offset into the image set. Default 0. |
| 623 |
* @type int $limit Batch size (clamped 1–200). Default 50. |
| 624 |
* @type bool $overwrite Overwrite existing alt text. Default false. |
| 625 |
* } |
| 626 |
* @return array { |
| 627 |
* @type int $total Total images in the library. |
| 628 |
* @type int $processed Images looked at in this batch. |
| 629 |
* @type int $updated Images whose alt text was written. |
| 630 |
* @type int $skipped Images left unchanged (already had alt / no value). |
| 631 |
* @type int $offset The offset this batch started at. |
| 632 |
* @type int $next_offset The offset to pass for the next batch. |
| 633 |
* @type int $remaining Images still to process after this batch. |
| 634 |
* @type bool $done True when the whole library has been processed. |
| 635 |
* } |
| 636 |
*/ |
| 637 |
public function bulk_fill_missing_alt(array $args = []): array { |
| 638 |
$offset = max(0, (int) ($args['offset'] ?? 0)); |
| 639 |
$limit = min(200, max(1, (int) ($args['limit'] ?? 50))); |
| 640 |
$overwrite = !empty($args['overwrite']); |
| 641 |
|
| 642 |
// In AI mode every image is a paid provider call that takes seconds, |
| 643 |
// so a 200-image batch would both surprise the user's bill and blow |
| 644 |
// past max_execution_time. Cap the batch and let the caller page — |
| 645 |
// `remaining` already drives that loop. |
| 646 |
if ('ai' === ($this->get_settings('site')['alt_source'] ?? 'template')) { |
| 647 |
$limit = min($limit, self::AI_BATCH_LIMIT); |
| 648 |
} |
| 649 |
|
| 650 |
$total = $this->count_images(); |
| 651 |
|
| 652 |
$ids = get_posts([ |
| 653 |
'post_type' => 'attachment', |
| 654 |
'post_mime_type' => 'image', |
| 655 |
// Must cover the same set count_images() counts, or the pager can |
| 656 |
// never reach the total. 'inherit' alone excluded private-status |
| 657 |
// attachments — which media-protection and membership plugins do |
| 658 |
// create — while count_images() still counted them (#322). |
| 659 |
'post_status' => ['inherit', 'private', 'publish', 'draft', 'pending', 'future'], |
| 660 |
'numberposts' => $limit, |
| 661 |
'offset' => $offset, |
| 662 |
'fields' => 'ids', |
| 663 |
'orderby' => 'ID', |
| 664 |
'order' => 'ASC', |
| 665 |
// phpcs:ignore WordPressVIPMinimum.Performance.WPQueryParams.SuppressFilters_suppress_filters -- The pager must walk the same unfiltered set count_images() counts, or it can never reach the total (#322). |
| 666 |
'suppress_filters' => true, |
| 667 |
]); |
| 668 |
|
| 669 |
$updated = 0; |
| 670 |
$skipped = 0; |
| 671 |
$processed = 0; |
| 672 |
|
| 673 |
foreach ($ids as $id) { |
| 674 |
$processed++; |
| 675 |
if ($this->fill_attachment_alt((int) $id, $overwrite)) { |
| 676 |
$updated++; |
| 677 |
} else { |
| 678 |
$skipped++; |
| 679 |
} |
| 680 |
} |
| 681 |
|
| 682 |
$next_offset = $offset + count($ids); |
| 683 |
|
| 684 |
// An empty batch means there is nothing left to walk, whatever the |
| 685 |
// total claims. Deriving `done` from the count alone let any drift |
| 686 |
// between the two queries strand the caller on a batch that could |
| 687 |
// never advance the offset, and the admin UI answers that by |
| 688 |
// re-requesting up to 10,000 times. |
| 689 |
$exhausted = empty($ids); |
| 690 |
$remaining = $exhausted ? 0 : max(0, $total - $next_offset); |
| 691 |
|
| 692 |
// Bulk writes change the Site SEO Analyzer's "images have alt text" coverage. |
| 693 |
if ($updated > 0) { |
| 694 |
$this->flush_analyzer_cache(); |
| 695 |
} |
| 696 |
|
| 697 |
return [ |
| 698 |
'total' => $total, |
| 699 |
'processed' => $processed, |
| 700 |
'updated' => $updated, |
| 701 |
'skipped' => $skipped, |
| 702 |
'offset' => $offset, |
| 703 |
'next_offset' => $next_offset, |
| 704 |
'remaining' => $remaining, |
| 705 |
'done' => $exhausted || $next_offset >= $total, |
| 706 |
]; |
| 707 |
} |
| 708 |
|
| 709 |
/** |
| 710 |
* Media Library alt-text coverage stats for the settings UI. |
| 711 |
* |
| 712 |
* @since 1.19.1 |
| 713 |
* @return array{total:int,with_alt:int,missing:int} |
| 714 |
*/ |
| 715 |
public function get_media_alt_stats(): array { |
| 716 |
$total = $this->count_images(); |
| 717 |
$with_alt = $this->count_images_with_alt(); |
| 718 |
|
| 719 |
return [ |
| 720 |
'total' => $total, |
| 721 |
'with_alt' => $with_alt, |
| 722 |
'missing' => max(0, $total - $with_alt), |
| 723 |
]; |
| 724 |
} |
| 725 |
|
| 726 |
/** |
| 727 |
* Auto-fill hook target — save alt text for a freshly uploaded image. |
| 728 |
* |
| 729 |
* Gated by the `save_alt_to_media` + `auto_fill_on_upload` settings so it is a |
| 730 |
* no-op unless the feature is enabled. Respects the overwrite preference. |
| 731 |
* |
| 732 |
* @since 1.19.1 |
| 733 |
* @param int $attachment_id The newly created attachment ID. |
| 734 |
* @return void |
| 735 |
*/ |
| 736 |
public function maybe_auto_fill_on_upload(int $attachment_id): void { |
| 737 |
$settings = $this->get_settings('site'); |
| 738 |
|
| 739 |
if (empty($settings['save_alt_to_media']) || empty($settings['auto_fill_on_upload'])) { |
| 740 |
return; |
| 741 |
} |
| 742 |
|
| 743 |
if (!wp_attachment_is_image($attachment_id)) { |
| 744 |
return; |
| 745 |
} |
| 746 |
|
| 747 |
$this->fill_attachment_alt($attachment_id, !empty($settings['media_alt_overwrite'])); |
| 748 |
} |
| 749 |
|
| 750 |
/** |
| 751 |
* Total number of image attachments in the library. |
| 752 |
* |
| 753 |
* Counted with an explicit `post_status != 'trash'` rather than through |
| 754 |
* wp_count_attachments(). The helper applies that filter internally, which |
| 755 |
* looked equivalent — but it left the two halves of get_media_alt_stats() |
| 756 |
* with different notions of which images exist, and only one of them said |
| 757 |
* so out loud. Spelling the filter out here keeps this query and |
| 758 |
* count_images_with_alt() visibly in step (#321). |
| 759 |
* |
| 760 |
* @since 1.19.1 |
| 761 |
* @return int |
| 762 |
*/ |
| 763 |
private function count_images(): int { |
| 764 |
// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- indexed COUNT; short-lived admin action |
| 765 |
return (int) $this->wpdb->get_var( |
| 766 |
"SELECT COUNT(*) FROM {$this->wpdb->posts} |
| 767 |
WHERE post_type = 'attachment' |
| 768 |
AND post_mime_type LIKE 'image/%' |
| 769 |
AND post_status != 'trash'" |
| 770 |
); |
| 771 |
// phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.InterpolatedNotPrepared |
| 772 |
} |
| 773 |
|
| 774 |
/** |
| 775 |
* Number of image attachments that already have non-empty alt text. |
| 776 |
* |
| 777 |
* Carries the same `post_status != 'trash'` filter as count_images(), so a |
| 778 |
* trashed image can never be counted as covered against a total it is not |
| 779 |
* part of. Matches the Site SEO Analyzer's alt-text check, which applies |
| 780 |
* the same filter to both of its counts. |
| 781 |
* |
| 782 |
* @since 1.19.1 |
| 783 |
* @return int |
| 784 |
*/ |
| 785 |
private function count_images_with_alt(): int { |
| 786 |
// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- indexed COUNT via postmeta meta_key index; short-lived admin action |
| 787 |
return (int) $this->wpdb->get_var( |
| 788 |
"SELECT COUNT(DISTINCT p.ID) FROM {$this->wpdb->posts} p |
| 789 |
INNER JOIN {$this->wpdb->postmeta} pm |
| 790 |
ON pm.post_id = p.ID |
| 791 |
AND pm.meta_key = '_wp_attachment_image_alt' |
| 792 |
AND pm.meta_value != '' |
| 793 |
WHERE p.post_type = 'attachment' |
| 794 |
AND p.post_mime_type LIKE 'image/%' |
| 795 |
AND p.post_status != 'trash'" |
| 796 |
); |
| 797 |
// phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.InterpolatedNotPrepared |
| 798 |
} |
| 799 |
|
| 800 |
/** |
| 801 |
* Bust the Site SEO Analyzer's cached result so its alt-text coverage refreshes. |
| 802 |
* |
| 803 |
* Uses the analyzer's transient key directly to avoid instantiating it here. |
| 804 |
* |
| 805 |
* @since 1.19.1 |
| 806 |
* @return void |
| 807 |
*/ |
| 808 |
private function flush_analyzer_cache(): void { |
| 809 |
// Ask the analyzer rather than duplicating its transient key here — the |
| 810 |
// literal drifted out of sync the moment anyone renamed it. |
| 811 |
if (class_exists('ThinkRank\\SEO\\SEO_Analyzer')) { |
| 812 |
(new SEO_Analyzer())->flush_cache(); |
| 813 |
} |
| 814 |
} |
| 815 |
} |
| 816 |
|
