| 1 |
<?php |
| 2 |
|
| 3 |
namespace EmbedPress\Gutenberg; |
| 4 |
|
| 5 |
// Exit if accessed directly |
| 6 |
if (!defined('ABSPATH')) { |
| 7 |
exit; |
| 8 |
} |
| 9 |
|
| 10 |
/** |
| 11 |
* EmbedPress Fallback Handler |
| 12 |
* |
| 13 |
* Handles edge cases where migration might fail or content cannot be properly migrated. |
| 14 |
* Provides graceful fallbacks to ensure content remains functional. |
| 15 |
*/ |
| 16 |
class FallbackHandler |
| 17 |
{ |
| 18 |
/** |
| 19 |
* Instance of this class |
| 20 |
*/ |
| 21 |
private static $instance = null; |
| 22 |
|
| 23 |
/** |
| 24 |
* Get instance |
| 25 |
*/ |
| 26 |
public static function get_instance() |
| 27 |
{ |
| 28 |
if (null === self::$instance) { |
| 29 |
self::$instance = new self(); |
| 30 |
} |
| 31 |
return self::$instance; |
| 32 |
} |
| 33 |
|
| 34 |
/** |
| 35 |
* Constructor |
| 36 |
*/ |
| 37 |
private function __construct() |
| 38 |
{ |
| 39 |
// Hook into block rendering to provide fallbacks |
| 40 |
add_filter('render_block', [$this, 'handle_block_fallback'], 10, 2); |
| 41 |
add_filter('render_block_data', [$this, 'handle_block_data_fallback'], 10, 1); |
| 42 |
} |
| 43 |
|
| 44 |
/** |
| 45 |
* Handle block rendering fallback |
| 46 |
*/ |
| 47 |
public function handle_block_fallback($block_content, $block) |
| 48 |
{ |
| 49 |
// Only handle EmbedPress blocks |
| 50 |
if ($block['blockName'] !== 'embedpress/embedpress') { |
| 51 |
return $block_content; |
| 52 |
} |
| 53 |
|
| 54 |
// If block content is empty or invalid, try to generate fallback |
| 55 |
if (empty($block_content) || $this->is_invalid_content($block_content)) { |
| 56 |
return $this->generate_fallback_content($block); |
| 57 |
} |
| 58 |
|
| 59 |
return $block_content; |
| 60 |
} |
| 61 |
|
| 62 |
/** |
| 63 |
* Handle block data fallback before rendering |
| 64 |
*/ |
| 65 |
public function handle_block_data_fallback($block) |
| 66 |
{ |
| 67 |
// Only handle EmbedPress blocks |
| 68 |
if ($block['blockName'] !== 'embedpress/embedpress') { |
| 69 |
return $block; |
| 70 |
} |
| 71 |
|
| 72 |
// Check if block has corrupted or missing attributes |
| 73 |
if (!isset($block['attrs']) || !is_array($block['attrs'])) { |
| 74 |
$block['attrs'] = $this->get_default_attributes(); |
| 75 |
} |
| 76 |
|
| 77 |
// Validate and fix critical attributes |
| 78 |
$block['attrs'] = $this->validate_and_fix_attributes($block['attrs']); |
| 79 |
|
| 80 |
return $block; |
| 81 |
} |
| 82 |
|
| 83 |
/** |
| 84 |
* Check if content is invalid |
| 85 |
*/ |
| 86 |
private function is_invalid_content($content) |
| 87 |
{ |
| 88 |
// Check for common signs of invalid content |
| 89 |
$invalid_patterns = [ |
| 90 |
'undefined', |
| 91 |
'null', |
| 92 |
'[object Object]', |
| 93 |
'NaN', |
| 94 |
'Error:', |
| 95 |
'Fatal error' |
| 96 |
]; |
| 97 |
|
| 98 |
foreach ($invalid_patterns as $pattern) { |
| 99 |
if (strpos($content, $pattern) !== false) { |
| 100 |
return true; |
| 101 |
} |
| 102 |
} |
| 103 |
|
| 104 |
// Check if content is just whitespace |
| 105 |
if (trim($content) === '') { |
| 106 |
return true; |
| 107 |
} |
| 108 |
|
| 109 |
return false; |
| 110 |
} |
| 111 |
|
| 112 |
/** |
| 113 |
* Generate fallback content for failed blocks |
| 114 |
*/ |
| 115 |
private function generate_fallback_content($block) |
| 116 |
{ |
| 117 |
$attrs = $block['attrs'] ?? []; |
| 118 |
$url = $attrs['url'] ?? ''; |
| 119 |
$embedHTML = $attrs['embedHTML'] ?? ''; |
| 120 |
|
| 121 |
// Try to use existing embedHTML first |
| 122 |
if (!empty($embedHTML) && !$this->is_invalid_content($embedHTML)) { |
| 123 |
return $this->wrap_fallback_content($embedHTML, 'Using cached embed content'); |
| 124 |
} |
| 125 |
|
| 126 |
// Try to generate new embed from URL |
| 127 |
if (!empty($url)) { |
| 128 |
$generated_embed = $this->generate_embed_from_url($url); |
| 129 |
if ($generated_embed) { |
| 130 |
return $this->wrap_fallback_content($generated_embed, 'Generated from URL'); |
| 131 |
} |
| 132 |
} |
| 133 |
|
| 134 |
// Last resort: show error message with URL |
| 135 |
return $this->generate_error_fallback($url); |
| 136 |
} |
| 137 |
|
| 138 |
/** |
| 139 |
* Generate embed content from URL |
| 140 |
*/ |
| 141 |
private function generate_embed_from_url($url) |
| 142 |
{ |
| 143 |
// Use WordPress oEmbed to try to generate content |
| 144 |
$embed = wp_oembed_get($url); |
| 145 |
|
| 146 |
if ($embed) { |
| 147 |
return $embed; |
| 148 |
} |
| 149 |
|
| 150 |
return false; |
| 151 |
} |
| 152 |
|
| 153 |
/** |
| 154 |
* Wrap fallback content with indicator |
| 155 |
*/ |
| 156 |
private function wrap_fallback_content($content, $reason = '') |
| 157 |
{ |
| 158 |
$debug_info = ''; |
| 159 |
|
| 160 |
if (defined('WP_DEBUG') && WP_DEBUG && !empty($reason)) { |
| 161 |
$debug_info = "<!-- EmbedPress Fallback: {$reason} -->"; |
| 162 |
} |
| 163 |
|
| 164 |
return $debug_info . '<div class="embedpress-fallback-content">' . $content . '</div>'; |
| 165 |
} |
| 166 |
|
| 167 |
/** |
| 168 |
* Generate error fallback |
| 169 |
*/ |
| 170 |
private function generate_error_fallback($url = '') |
| 171 |
{ |
| 172 |
$message = __('EmbedPress: Content could not be loaded.', 'embedpress'); |
| 173 |
|
| 174 |
if (!empty($url)) { |
| 175 |
$message .= ' ' . sprintf(__('Original URL: %s', 'embedpress'), esc_url($url)); |
| 176 |
} |
| 177 |
|
| 178 |
$html = '<div class="embedpress-error-fallback" style="padding: 20px; border: 1px solid #ddd; background: #f9f9f9; text-align: center;">'; |
| 179 |
$html .= '<p>' . esc_html($message) . '</p>'; |
| 180 |
|
| 181 |
if (!empty($url)) { |
| 182 |
$html .= '<p><a href="' . esc_url($url) . '" target="_blank" rel="noopener">' . __('View Original Content', 'embedpress') . '</a></p>'; |
| 183 |
} |
| 184 |
|
| 185 |
$html .= '</div>'; |
| 186 |
|
| 187 |
return $html; |
| 188 |
} |
| 189 |
|
| 190 |
/** |
| 191 |
* Get default attributes for fallback |
| 192 |
*/ |
| 193 |
private function get_default_attributes() |
| 194 |
{ |
| 195 |
return [ |
| 196 |
'url' => '', |
| 197 |
'embedHTML' => '', |
| 198 |
'height' => '600', |
| 199 |
'width' => '600', |
| 200 |
'customPlayer' => [], |
| 201 |
'sharePosition' => 'bottom', |
| 202 |
'isFallback' => true |
| 203 |
]; |
| 204 |
} |
| 205 |
|
| 206 |
/** |
| 207 |
* Validate and fix attributes |
| 208 |
*/ |
| 209 |
private function validate_and_fix_attributes($attrs) |
| 210 |
{ |
| 211 |
$defaults = $this->get_default_attributes(); |
| 212 |
|
| 213 |
// Ensure all required attributes exist |
| 214 |
foreach ($defaults as $key => $default_value) { |
| 215 |
if (!isset($attrs[$key])) { |
| 216 |
$attrs[$key] = $default_value; |
| 217 |
} |
| 218 |
} |
| 219 |
|
| 220 |
// Validate URL |
| 221 |
if (!empty($attrs['url']) && !filter_var($attrs['url'], FILTER_VALIDATE_URL)) { |
| 222 |
// Try to fix common URL issues |
| 223 |
$fixed_url = $this->fix_url($attrs['url']); |
| 224 |
if ($fixed_url) { |
| 225 |
$attrs['url'] = $fixed_url; |
| 226 |
} else { |
| 227 |
// If URL is completely invalid, clear it |
| 228 |
$attrs['url'] = ''; |
| 229 |
} |
| 230 |
} |
| 231 |
|
| 232 |
// Validate dimensions |
| 233 |
$attrs['height'] = $this->validate_dimension($attrs['height'], '600'); |
| 234 |
$attrs['width'] = $this->validate_dimension($attrs['width'], '600'); |
| 235 |
|
| 236 |
// Validate customPlayer object |
| 237 |
if (!is_array($attrs['customPlayer'])) { |
| 238 |
$attrs['customPlayer'] = []; |
| 239 |
} |
| 240 |
|
| 241 |
return $attrs; |
| 242 |
} |
| 243 |
|
| 244 |
/** |
| 245 |
* Fix common URL issues |
| 246 |
*/ |
| 247 |
private function fix_url($url) |
| 248 |
{ |
| 249 |
// Add protocol if missing |
| 250 |
if (!preg_match('/^https?:\/\//', $url)) { |
| 251 |
$url = 'https://' . $url; |
| 252 |
} |
| 253 |
|
| 254 |
// Validate the fixed URL |
| 255 |
if (filter_var($url, FILTER_VALIDATE_URL)) { |
| 256 |
return $url; |
| 257 |
} |
| 258 |
|
| 259 |
return false; |
| 260 |
} |
| 261 |
|
| 262 |
/** |
| 263 |
* Validate dimension values |
| 264 |
*/ |
| 265 |
private function validate_dimension($value, $default = '600') |
| 266 |
{ |
| 267 |
// If it's a valid number or number with px/%, return as is |
| 268 |
if (is_numeric($value) || preg_match('/^\d+(px|%)?$/', $value)) { |
| 269 |
return $value; |
| 270 |
} |
| 271 |
|
| 272 |
return $default; |
| 273 |
} |
| 274 |
|
| 275 |
/** |
| 276 |
* Log fallback usage for debugging |
| 277 |
*/ |
| 278 |
private function log_fallback_usage($type, $details = []) |
| 279 |
{ |
| 280 |
if (defined('WP_DEBUG') && WP_DEBUG) { |
| 281 |
$log_message = "EmbedPress Fallback Used: {$type}"; |
| 282 |
|
| 283 |
if (!empty($details)) { |
| 284 |
$log_message .= ' - ' . json_encode($details); |
| 285 |
} |
| 286 |
|
| 287 |
} |
| 288 |
} |
| 289 |
|
| 290 |
/** |
| 291 |
* Check if fallback is needed for a specific block |
| 292 |
*/ |
| 293 |
public function is_fallback_needed($block) |
| 294 |
{ |
| 295 |
if ($block['blockName'] !== 'embedpress/embedpress') { |
| 296 |
return false; |
| 297 |
} |
| 298 |
|
| 299 |
$attrs = $block['attrs'] ?? []; |
| 300 |
|
| 301 |
// Check for missing critical data |
| 302 |
if (empty($attrs['url']) && empty($attrs['embedHTML'])) { |
| 303 |
return true; |
| 304 |
} |
| 305 |
|
| 306 |
// Check for corrupted attributes |
| 307 |
if (!is_array($attrs)) { |
| 308 |
return true; |
| 309 |
} |
| 310 |
|
| 311 |
return false; |
| 312 |
} |
| 313 |
} |
| 314 |
|
