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class-wp-http-encoding.php (6654B)

---

 <?php
 /**
  * HTTP API: WP_Http_Encoding class
  *
  * @package WordPress
  * @subpackage HTTP
  * @since 4.4.0
  */
 
 /**
  * Core class used to implement deflate and gzip transfer encoding support for HTTP requests.
  *
  * Includes RFC 1950, RFC 1951, and RFC 1952.
  *
  * @since 2.8.0
  */
 class WP_Http_Encoding {
 
 	/**
 	 * Compress raw string using the deflate format.
 	 *
 	 * Supports the RFC 1951 standard.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @param string $raw      String to compress.
 	 * @param int    $level    Optional. Compression level, 9 is highest. Default 9.
 	 * @param string $supports Optional, not used. When implemented it will choose
 	 *                         the right compression based on what the server supports.
 	 * @return string|false Compressed string on success, false on failure.
 	 */
 	public static function compress( $raw, $level = 9, $supports = null ) {
 		return gzdeflate( $raw, $level );
 	}
 
 	/**
 	 * Decompression of deflated string.
 	 *
 	 * Will attempt to decompress using the RFC 1950 standard, and if that fails
 	 * then the RFC 1951 standard deflate will be attempted. Finally, the RFC
 	 * 1952 standard gzip decode will be attempted. If all fail, then the
 	 * original compressed string will be returned.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @param string $compressed String to decompress.
 	 * @param int    $length     The optional length of the compressed data.
 	 * @return string|false Decompressed string on success, false on failure.
 	 */
 	public static function decompress( $compressed, $length = null ) {
 
 		if ( empty( $compressed ) ) {
 			return $compressed;
 		}
 
 		$decompressed = @gzinflate( $compressed );
 		if ( false !== $decompressed ) {
 			return $decompressed;
 		}
 
 		$decompressed = self::compatible_gzinflate( $compressed );
 		if ( false !== $decompressed ) {
 			return $decompressed;
 		}
 
 		$decompressed = @gzuncompress( $compressed );
 		if ( false !== $decompressed ) {
 			return $decompressed;
 		}
 
 		if ( function_exists( 'gzdecode' ) ) {
 			$decompressed = @gzdecode( $compressed );
 
 			if ( false !== $decompressed ) {
 				return $decompressed;
 			}
 		}
 
 		return $compressed;
 	}
 
 	/**
 	 * Decompression of deflated string while staying compatible with the majority of servers.
 	 *
 	 * Certain Servers will return deflated data with headers which PHP's gzinflate()
 	 * function cannot handle out of the box. The following function has been created from
 	 * various snippets on the gzinflate() PHP documentation.
 	 *
 	 * Warning: Magic numbers within. Due to the potential different formats that the compressed
 	 * data may be returned in, some "magic offsets" are needed to ensure proper decompression
 	 * takes place. For a simple progmatic way to determine the magic offset in use, see:
 	 * https://core.trac.wordpress.org/ticket/18273
 	 *
 	 * @since 2.8.1
 	 *
 	 * @link https://core.trac.wordpress.org/ticket/18273
 	 * @link https://www.php.net/manual/en/function.gzinflate.php#70875
 	 * @link https://www.php.net/manual/en/function.gzinflate.php#77336
 	 *
 	 * @param string $gzData String to decompress.
 	 * @return string|false Decompressed string on success, false on failure.
 	 */
 	public static function compatible_gzinflate( $gzData ) {
 
 		// Compressed data might contain a full header, if so strip it for gzinflate().
 		if ( "\x1f\x8b\x08" === substr( $gzData, 0, 3 ) ) {
 			$i   = 10;
 			$flg = ord( substr( $gzData, 3, 1 ) );
 			if ( $flg > 0 ) {
 				if ( $flg & 4 ) {
 					list($xlen) = unpack( 'v', substr( $gzData, $i, 2 ) );
 					$i          = $i + 2 + $xlen;
 				}
 				if ( $flg & 8 ) {
 					$i = strpos( $gzData, "\0", $i ) + 1;
 				}
 				if ( $flg & 16 ) {
 					$i = strpos( $gzData, "\0", $i ) + 1;
 				}
 				if ( $flg & 2 ) {
 					$i = $i + 2;
 				}
 			}
 			$decompressed = @gzinflate( substr( $gzData, $i, -8 ) );
 			if ( false !== $decompressed ) {
 				return $decompressed;
 			}
 		}
 
 		// Compressed data from java.util.zip.Deflater amongst others.
 		$decompressed = @gzinflate( substr( $gzData, 2 ) );
 		if ( false !== $decompressed ) {
 			return $decompressed;
 		}
 
 		return false;
 	}
 
 	/**
 	 * What encoding types to accept and their priority values.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @param string $url
 	 * @param array  $args
 	 * @return string Types of encoding to accept.
 	 */
 	public static function accept_encoding( $url, $args ) {
 		$type                = array();
 		$compression_enabled = self::is_available();
 
 		if ( ! $args['decompress'] ) { // Decompression specifically disabled.
 			$compression_enabled = false;
 		} elseif ( $args['stream'] ) { // Disable when streaming to file.
 			$compression_enabled = false;
 		} elseif ( isset( $args['limit_response_size'] ) ) { // If only partial content is being requested, we won't be able to decompress it.
 			$compression_enabled = false;
 		}
 
 		if ( $compression_enabled ) {
 			if ( function_exists( 'gzinflate' ) ) {
 				$type[] = 'deflate;q=1.0';
 			}
 
 			if ( function_exists( 'gzuncompress' ) ) {
 				$type[] = 'compress;q=0.5';
 			}
 
 			if ( function_exists( 'gzdecode' ) ) {
 				$type[] = 'gzip;q=0.5';
 			}
 		}
 
 		/**
 		 * Filters the allowed encoding types.
 		 *
 		 * @since 3.6.0
 		 *
 		 * @param string[] $type Array of what encoding types to accept and their priority values.
 		 * @param string   $url  URL of the HTTP request.
 		 * @param array    $args HTTP request arguments.
 		 */
 		$type = apply_filters( 'wp_http_accept_encoding', $type, $url, $args );
 
 		return implode( ', ', $type );
 	}
 
 	/**
 	 * What encoding the content used when it was compressed to send in the headers.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @return string Content-Encoding string to send in the header.
 	 */
 	public static function content_encoding() {
 		return 'deflate';
 	}
 
 	/**
 	 * Whether the content be decoded based on the headers.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @param array|string $headers All of the available headers.
 	 * @return bool
 	 */
 	public static function should_decode( $headers ) {
 		if ( is_array( $headers ) ) {
 			if ( array_key_exists( 'content-encoding', $headers ) && ! empty( $headers['content-encoding'] ) ) {
 				return true;
 			}
 		} elseif ( is_string( $headers ) ) {
 			return ( stripos( $headers, 'content-encoding:' ) !== false );
 		}
 
 		return false;
 	}
 
 	/**
 	 * Whether decompression and compression are supported by the PHP version.
 	 *
 	 * Each function is tested instead of checking for the zlib extension, to
 	 * ensure that the functions all exist in the PHP version and aren't
 	 * disabled.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @return bool
 	 */
 	public static function is_available() {
 		return ( function_exists( 'gzuncompress' ) || function_exists( 'gzdeflate' ) || function_exists( 'gzinflate' ) );
 	}
 }