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| 1 | <?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName |
| 2 | /** |
| 3 | * Sitemaps (per the protocol) are essentially lists of XML fragments; |
| 4 | * lists which are subject to size constraints. The Jetpack_Sitemap_Buffer |
| 5 | * class abstracts the details of constructing these lists while |
| 6 | * maintaining the constraints. |
| 7 | * |
| 8 | * @since 4.8.0 |
| 9 | * @package automattic/jetpack |
| 10 | */ |
| 11 | |
| 12 | if ( ! defined( 'ABSPATH' ) ) { |
| 13 | exit( 0 ); |
| 14 | } |
| 15 | |
| 16 | /** |
| 17 | * A buffer for constructing sitemap xml files. |
| 18 | * |
| 19 | * Models a list of strings such that |
| 20 | * |
| 21 | * 1. the list must have a bounded number of entries, |
| 22 | * 2. the concatenation of the strings must have bounded |
| 23 | * length (including some header and footer strings), and |
| 24 | * 3. each item has a timestamp, and we need to keep track |
| 25 | * of the most recent timestamp of the items in the list. |
| 26 | * |
| 27 | * @since 4.8.0 |
| 28 | */ |
| 29 | abstract class Jetpack_Sitemap_Buffer { |
| 30 | |
| 31 | /** |
| 32 | * Largest number of items the buffer can hold. |
| 33 | * |
| 34 | * @access protected |
| 35 | * @since 4.8.0 |
| 36 | * @var int $item_capacity The item capacity. |
| 37 | */ |
| 38 | protected $item_capacity; |
| 39 | |
| 40 | /** |
| 41 | * Largest number of bytes the buffer can hold. |
| 42 | * |
| 43 | * @access protected |
| 44 | * @since 4.8.0 |
| 45 | * @var int $byte_capacity The byte capacity. |
| 46 | */ |
| 47 | protected $byte_capacity; |
| 48 | |
| 49 | /** |
| 50 | * Flag which detects when the buffer is full. |
| 51 | * |
| 52 | * @access protected |
| 53 | * @since 4.8.0 |
| 54 | * @var bool $is_full_flag The flag value. This flag is set to false on construction and only flipped to true if we've tried to add something and failed. |
| 55 | */ |
| 56 | protected $is_full_flag; |
| 57 | |
| 58 | /** |
| 59 | * Flag which detects when the buffer is empty. |
| 60 | * |
| 61 | * @access protected |
| 62 | * @since 4.8.0 |
| 63 | * @var bool $is_empty_flag The flag value. This flag is set to true on construction and only flipped to false if we've tried to add something and succeeded. |
| 64 | */ |
| 65 | protected $is_empty_flag; |
| 66 | |
| 67 | /** |
| 68 | * The most recent timestamp seen by the buffer. |
| 69 | * |
| 70 | * @access protected |
| 71 | * @since 4.8.0 |
| 72 | * @var string $timestamp Must be in 'YYYY-MM-DD hh:mm:ss' format. |
| 73 | */ |
| 74 | protected $timestamp; |
| 75 | |
| 76 | /** |
| 77 | * The DOM document object that is currently being used to construct the XML doc. |
| 78 | * |
| 79 | * @access protected |
| 80 | * @since 5.3.0 |
| 81 | * @var DOMDocument $doc |
| 82 | */ |
| 83 | protected $doc = null; |
| 84 | |
| 85 | /** |
| 86 | * The root DOM element object that holds everything inside. Do not use directly, call |
| 87 | * the get_root_element getter method instead. |
| 88 | * |
| 89 | * @access protected |
| 90 | * @since 5.3.0 |
| 91 | * @var DOMElement $doc |
| 92 | */ |
| 93 | protected $root = null; |
| 94 | |
| 95 | /** |
| 96 | * Helper class to construct sitemap paths. |
| 97 | * |
| 98 | * @since 5.3.0 |
| 99 | * @protected |
| 100 | * @var Jetpack_Sitemap_Finder |
| 101 | */ |
| 102 | protected $finder; |
| 103 | |
| 104 | /** |
| 105 | * Construct a new Jetpack_Sitemap_Buffer. |
| 106 | * |
| 107 | * @since 4.8.0 |
| 108 | * |
| 109 | * @param int $item_limit The maximum size of the buffer in items. |
| 110 | * @param int $byte_limit The maximum size of the buffer in bytes. |
| 111 | * @param string $time The initial datetime of the buffer. Must be in 'YYYY-MM-DD hh:mm:ss' format. |
| 112 | */ |
| 113 | public function __construct( $item_limit, $byte_limit, $time ) { |
| 114 | $this->is_full_flag = false; |
| 115 | $this->timestamp = $time; |
| 116 | |
| 117 | $this->finder = new Jetpack_Sitemap_Finder(); |
| 118 | $this->doc = new DOMDocument( '1.0', 'UTF-8' ); |
| 119 | $this->doc->formatOutput = true; |
| 120 | $this->doc->preserveWhiteSpace = false; |
| 121 | |
| 122 | $this->item_capacity = max( 1, (int) $item_limit ); |
| 123 | $this->byte_capacity = max( 1, (int) $byte_limit ) - strlen( $this->doc->saveXML() ); |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Returns a DOM element that contains all sitemap elements. |
| 128 | * |
| 129 | * @access protected |
| 130 | * @since 5.3.0 |
| 131 | * @return DOMElement $root |
| 132 | */ |
| 133 | abstract protected function get_root_element(); |
| 134 | |
| 135 | /** |
| 136 | * Append an item to the buffer, if there is room for it, |
| 137 | * and set is_empty_flag to false. If there is no room, |
| 138 | * we set is_full_flag to true. If $item is null, |
| 139 | * don't do anything and report success. |
| 140 | * |
| 141 | * @since 5.3.0 |
| 142 | * |
| 143 | * @param array $array The item to be added. |
| 144 | * |
| 145 | * @return bool True if the append succeeded, False if not. |
| 146 | */ |
| 147 | public function append( $array ) { |
| 148 | if ( $array === null ) { |
| 149 | return true; |
| 150 | } |
| 151 | |
| 152 | if ( $this->is_full_flag ) { |
| 153 | return false; |
| 154 | } |
| 155 | |
| 156 | if ( 0 >= $this->item_capacity || 0 >= $this->byte_capacity ) { |
| 157 | $this->is_full_flag = true; |
| 158 | return false; |
| 159 | } else { |
| 160 | $this->item_capacity -= 1; |
| 161 | $added_element = $this->array_to_xml_string( $array, $this->get_root_element(), $this->doc ); |
| 162 | |
| 163 | $this->byte_capacity -= strlen( $this->doc->saveXML( $added_element ) ); |
| 164 | |
| 165 | return true; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Retrieve the contents of the buffer. |
| 171 | * |
| 172 | * @since 4.8.0 |
| 173 | * |
| 174 | * @return string The contents of the buffer (with the footer included). |
| 175 | */ |
| 176 | public function contents() { |
| 177 | if ( $this->is_empty() ) { |
| 178 | // The sitemap should have at least the root element added to the DOM. |
| 179 | $this->get_root_element(); |
| 180 | } |
| 181 | return $this->doc->saveXML(); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Retrieve the document object. |
| 186 | * |
| 187 | * @since 5.3.0 |
| 188 | * @return DOMDocument $doc |
| 189 | */ |
| 190 | public function get_document() { |
| 191 | return $this->doc; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Detect whether the buffer is full. |
| 196 | * |
| 197 | * @since 4.8.0 |
| 198 | * |
| 199 | * @return bool True if the buffer is full, false otherwise. |
| 200 | */ |
| 201 | public function is_full() { |
| 202 | return $this->is_full_flag; |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * Detect whether the buffer is empty. |
| 207 | * |
| 208 | * @since 4.8.0 |
| 209 | * |
| 210 | * @return bool True if the buffer is empty, false otherwise. |
| 211 | */ |
| 212 | public function is_empty() { |
| 213 | return ( |
| 214 | ! isset( $this->root ) |
| 215 | || ! $this->root->hasChildNodes() |
| 216 | ); |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Update the timestamp of the buffer. |
| 221 | * |
| 222 | * @since 4.8.0 |
| 223 | * |
| 224 | * @param string $new_time A datetime string in 'YYYY-MM-DD hh:mm:ss' format. |
| 225 | */ |
| 226 | public function view_time( $new_time ) { |
| 227 | $this->timestamp = max( $this->timestamp, $new_time ); |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * Retrieve the timestamp of the buffer. |
| 232 | * |
| 233 | * @since 4.8.0 |
| 234 | * |
| 235 | * @return string A datetime string in 'YYYY-MM-DD hh:mm:ss' format. |
| 236 | */ |
| 237 | public function last_modified() { |
| 238 | return $this->timestamp; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Render an associative array as an XML string. This is needed because |
| 243 | * SimpleXMLElement only handles valid XML, but we sometimes want to |
| 244 | * pass around (possibly invalid) fragments. Note that 'null' values make |
| 245 | * a tag self-closing; this is only sometimes correct (depending on the |
| 246 | * version of HTML/XML); see the list of 'void tags'. |
| 247 | * |
| 248 | * Example: |
| 249 | * |
| 250 | * array( |
| 251 | * 'html' => array( |<html xmlns="foo"> |
| 252 | * 'head' => array( | <head> |
| 253 | * 'title' => 'Woo!', | <title>Woo!</title> |
| 254 | * ), | </head> |
| 255 | * 'body' => array( ==> | <body> |
| 256 | * 'h2' => 'Some thing', | <h2>Some thing</h2> |
| 257 | * 'p' => 'it's all up ons', | <p>it's all up ons</p> |
| 258 | * 'br' => null, | <br /> |
| 259 | * ), | </body> |
| 260 | * ), |</html> |
| 261 | * ) |
| 262 | * |
| 263 | * @access protected |
| 264 | * @since 3.9.0 |
| 265 | * @since 4.8.0 Rename, add $depth parameter, and change return type. |
| 266 | * @since 5.3.0 Refactor, remove $depth parameter, add $parent and $root, make access protected. |
| 267 | * |
| 268 | * @param array $array A recursive associative array of tag/child relationships. |
| 269 | * @param DOMElement $parent (optional) an element to which new children should be added. |
| 270 | * @param DOMDocument $root (optional) the parent document. |
| 271 | * |
| 272 | * @return string|DOMDocument The rendered XML string or an object if root element is specified. |
| 273 | */ |
| 274 | protected function array_to_xml_string( $array, $parent = null, $root = null ) { |
| 275 | $element = null; |
| 276 | $return_string = false; |
| 277 | |
| 278 | if ( null === $parent ) { |
| 279 | $return_string = true; |
| 280 | $root = new DOMDocument(); |
| 281 | $parent = $root; |
| 282 | } |
| 283 | |
| 284 | if ( is_array( $array ) ) { |
| 285 | |
| 286 | foreach ( $array as $key => $value ) { |
| 287 | $element = $root->createElement( $key ); |
| 288 | $parent->appendChild( $element ); |
| 289 | |
| 290 | if ( is_array( $value ) ) { |
| 291 | foreach ( $value as $child_key => $child_value ) { |
| 292 | $child = $root->createElement( $child_key ); |
| 293 | $element->appendChild( $child ); |
| 294 | $child->appendChild( self::array_to_xml_string( $child_value, $child, $root ) ); |
| 295 | } |
| 296 | } else { |
| 297 | $element->appendChild( |
| 298 | $root->createTextNode( $value ) |
| 299 | ); |
| 300 | } |
| 301 | } |
| 302 | } else { |
| 303 | $element = $root->createTextNode( $array ); |
| 304 | $parent->appendChild( $element ); |
| 305 | } |
| 306 | |
| 307 | if ( $return_string ) { |
| 308 | return $root->saveHTML(); |
| 309 | } else { |
| 310 | return $element; |
| 311 | } |
| 312 | } |
| 313 | } |