Changeset 38726 for trunk/src/wp-includes/http.php

Timestamp:

10/04/2016 08:32:40 PM (8 years ago)

Author:

peterwilsoncc

Message:

HTTP API: Simplify wp_parse_url() to ensure consistent results.

[38694] revealed some URL formats were been parsed incorrectly, including those used by Google Fonts. This change simplifies the function to use placeholder values which cause PHP's parsing to behave consistently.

Props jrf, peterwilsoncc.
Fixes #36356.

File:

• trunk/src/wp-includes/http.php (modified) (2 diffs)

trunk/src/wp-includes/http.php

@@ -624 +624 @@
 
 /**
- * A wrapper for PHP's parse_url() function that handles edgecases in < PHP 5.4.7
+ * A wrapper for PHP's parse_url() function that handles consistency in the return
+ * values across PHP versions.
  *
  * PHP 5.4.7 expanded parse_url()'s ability to handle non-absolute url's, including
- * schemeless and relative url's with :// in the path, this works around those
- * limitations providing a standard output on PHP 5.2~5.4+.
+ * schemeless and relative url's with :// in the path. This function works around
+ * those limitations providing a standard output on PHP 5.2~5.4+.
+ *
+ * Secondly, across various PHP versions, schemeless URLs starting containing a ":"
+ * in the query are being handled inconsistently. This function works around those
+ * differences as well.
  *
  * Error suppression is used as prior to PHP 5.3.3, an E_WARNING would be generated
@@ -641 +646 @@
  *                          Defaults to -1 (= return all parts as an array).
  *                          @see http://php.net/manual/en/function.parse-url.php
- * @return mixed False on failure; Array of URL components on success;
- *               When a specific component has been requested: null if the component doesn't
- *               exist in the given URL; a sting or - in the case of PHP_URL_PORT - integer
- *               when it does; See parse_url()'s return values.
+ * @return mixed False on parse failure; Array of URL components on success;
+ *               When a specific component has been requested: null if the component
+ *               doesn't exist in the given URL; a sting or - in the case of
+ *               PHP_URL_PORT - integer when it does. See parse_url()'s return values.
  */
 function wp_parse_url( $url, $component = -1 ) {
-    $parts = @parse_url( $url, $component );
-
-    if ( version_compare( PHP_VERSION, '5.4.7', '>=' ) ) {
+    $to_unset = array();
+    $url = strval( $url );
+
+    if ( '//' === substr( $url, 0, 2 ) ) {
+        $to_unset[] = 'scheme';
+        $url = 'placeholder:' . $url;
+    } elseif ( '/' === substr( $url, 0, 1 ) ) {
+        $to_unset[] = 'scheme';
+        $to_unset[] = 'host';
+        $url = 'placeholder://placeholder' . $url;
+    }
+
+    $parts = @parse_url( $url );
+
+    if ( false === $parts ) {
+        // Parsing failure.
         return $parts;
     }
 
-    if ( false === $parts ) {
-        // < PHP 5.4.7 compat, trouble with relative paths including a scheme break in the path.
-        if ( '/' == $url[0] && false !== strpos( $url, '://' ) ) {
-            if ( in_array( $component, array( PHP_URL_SCHEME, PHP_URL_HOST ), true ) ) {
-                return null;
-            }
-            // Since we know it's a relative path, prefix with a scheme/host placeholder and try again.
-            if ( ! $parts = @parse_url( 'placeholder://placeholder' . $url, $component ) ) {
-                return $parts;
-            }
-            // Remove the placeholder values.
-            if ( -1 === $component ) {
-                unset( $parts['scheme'], $parts['host'] );
-            }
-        } else {
-            return $parts;
-        }
-    }
-
-    // < PHP 5.4.7 compat, doesn't detect a schemeless URL's host field.
-    if ( '//' == substr( $url, 0, 2 ) ) {
-        if ( -1 === $component && ! isset( $parts['host'] ) ) {
-            $path_parts = explode( '/', substr( $parts['path'], 2 ), 2 );
-            $parts['host'] = $path_parts[0];
-            if ( isset( $path_parts[1] ) ) {
-                $parts['path'] = '/' . $path_parts[1];
-            } else {
-                unset( $parts['path'] );
-            }
-        } elseif ( PHP_URL_HOST === $component || PHP_URL_PATH === $component ) {
-            $all_parts = @parse_url( $url );
-            if ( ! isset( $all_parts['host'] ) ) {
-                $path_parts = explode( '/', substr( $all_parts['path'], 2 ), 2 );
-                if ( PHP_URL_PATH === $component ) {
-                    if ( isset( $path_parts[1] ) ) {
-                        $parts = '/' . $path_parts[1];
-                    } else {
-                        $parts = null;
-                    }
-                } elseif ( PHP_URL_HOST === $component ) {
-                    $parts = $path_parts[0];
-                }
-            }
-        }
-    }
-
-    return $parts;
-}
+    // Remove the placeholder values.
+    foreach ( $to_unset as $key ) {
+        unset( $parts[ $key ] );
+    }
+
+    return _get_component_from_parsed_url_array( $parts, $component );
+}
+
+/**
+ * Retrieve a specific component from a parsed URL array.
+ *
+ * @internal
+ *
+ * @since 4.7.0
+ *
+ * @param array|false $url_parts The parsed URL. Can be false if the URL failed to parse.
+ * @param int    $component The specific component to retrieve. Use one of the PHP
+ *                          predefined constants to specify which one.
+ *                          Defaults to -1 (= return all parts as an array).
+ *                          @see http://php.net/manual/en/function.parse-url.php
+ * @return mixed False on parse failure; Array of URL components on success;
+ *               When a specific component has been requested: null if the component
+ *               doesn't exist in the given URL; a sting or - in the case of
+ *               PHP_URL_PORT - integer when it does. See parse_url()'s return values.
+ */
+function _get_component_from_parsed_url_array( $url_parts, $component = -1 ) {
+    if ( -1 === $component ) {
+        return $url_parts;
+    }
+
+    $key = _wp_translate_php_url_constant_to_key( $component );
+    if ( false !== $key && is_array( $url_parts ) && isset( $url_parts[ $key ] ) ) {
+        return $url_parts[ $key ];
+    } else {
+        return null;
+    }
+}
+
+/**
+ * Translate a PHP_URL_* constant to the named array keys PHP uses.
+ *
+ * @internal
+ *
+ * @since 4.7.0
+ *
+ * @see   http://php.net/manual/en/url.constants.php
+ *
+ * @param int $constant PHP_URL_* constant.
+ * @return string|bool The named key or false.
+ */
+function _wp_translate_php_url_constant_to_key( $constant ) {
+    $translation = array(
+        PHP_URL_SCHEME   => 'scheme',
+        PHP_URL_HOST     => 'host',
+        PHP_URL_PORT     => 'port',
+        PHP_URL_USER     => 'user',
+        PHP_URL_PASS     => 'pass',
+        PHP_URL_PATH     => 'path',
+        PHP_URL_QUERY    => 'query',
+        PHP_URL_FRAGMENT => 'fragment',
+    );
+
+    if ( isset( $translation[ $constant ] ) ) {
+        return $translation[ $constant ];
+    } else {
+        return false;
+    }
+}