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<?php |
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|
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require_once dirname( __FILE__ ) . '/../class.json-api.php'; |
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|
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class WPCOM_JSON_API_Links { |
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private $api; |
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private static $instance; |
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private $closest_endpoint_cache_by_version = array(); |
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private $matches_by_version = array(); |
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private $cache_result = null; |
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|
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public static function getInstance() { |
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if ( null === self::$instance ) { |
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self::$instance = new self(); |
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} |
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|
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return self::$instance; |
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} |
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|
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// protect these methods for singleton |
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protected function __construct() { |
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$this->api = WPCOM_JSON_API::init(); |
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} |
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private function __clone() { } |
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public function __wakeup() { |
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die( "Please don't __wakeup WPCOM_JSON_API_Links" ); |
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} |
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|
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/** |
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* Generate a URL to an endpoint |
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* |
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* Used to construct meta links in API responses |
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* |
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* @param mixed ...$args Optional arguments to be appended to URL |
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* @return string Endpoint URL |
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**/ |
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function get_link( ...$args ) { |
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$format = array_shift( $args ); |
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$base = WPCOM_JSON_API__BASE; |
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|
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$path = array_pop( $args ); |
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|
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if ( $path ) { |
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$path = '/' . ltrim( $path, '/' ); |
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// tack the path onto the end of the format string |
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// have to escape %'s in the path as %% because |
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// we're about to pass it through sprintf and we don't |
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// want it to see the % as a placeholder |
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$format .= str_replace( '%', '%%', $path ); |
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} |
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|
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// Escape any % in args before using sprintf |
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$escaped_args = array(); |
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foreach ( $args as $arg_key => $arg_value ) { |
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$escaped_args[ $arg_key ] = str_replace( '%', '%%', $arg_value ); |
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} |
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|
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$relative_path = vsprintf( $format, $escaped_args ); |
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|
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if ( ! wp_startswith( $relative_path, '.' ) ) { |
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// Generic version. Match the requested version as best we can |
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$api_version = $this->get_closest_version_of_endpoint( $format, $relative_path ); |
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$base = substr( $base, 0, - 1 ) . $api_version; |
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} |
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|
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// escape any % in the relative path before running it through sprintf again |
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$relative_path = str_replace( '%', '%%', $relative_path ); |
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// http, WPCOM_JSON_API__BASE, ... , path |
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// %s , %s , $format, %s |
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return esc_url_raw( sprintf( "https://%s$relative_path", $base ) ); |
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} |
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|
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function get_me_link( $path = '' ) { |
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return $this->get_link( '/me', $path ); |
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} |
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|
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function get_taxonomy_link( $blog_id, $taxonomy_id, $taxonomy_type, $path = '' ) { |
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switch ( $taxonomy_type ) { |
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case 'category': |
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return $this->get_link( '/sites/%d/categories/slug:%s', $blog_id, $taxonomy_id, $path ); |
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|
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case 'post_tag': |
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return $this->get_link( '/sites/%d/tags/slug:%s', $blog_id, $taxonomy_id, $path ); |
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|
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default: |
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return $this->get_link( '/sites/%d/taxonomies/%s/terms/slug:%s', $blog_id, $taxonomy_type, $taxonomy_id, $path ); |
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} |
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} |
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|
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function get_media_link( $blog_id, $media_id, $path = '' ) { |
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return $this->get_link( '/sites/%d/media/%d', $blog_id, $media_id, $path ); |
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} |
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|
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function get_site_link( $blog_id, $path = '' ) { |
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return $this->get_link( '/sites/%d', $blog_id, $path ); |
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} |
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|
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function get_post_link( $blog_id, $post_id, $path = '' ) { |
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return $this->get_link( '/sites/%d/posts/%d', $blog_id, $post_id, $path ); |
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} |
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|
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function get_comment_link( $blog_id, $comment_id, $path = '' ) { |
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return $this->get_link( '/sites/%d/comments/%d', $blog_id, $comment_id, $path ); |
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} |
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|
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function get_publicize_connection_link( $blog_id, $publicize_connection_id, $path = '' ) { |
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return $this->get_link( '.1/sites/%d/publicize-connections/%d', $blog_id, $publicize_connection_id, $path ); |
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} |
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|
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function get_publicize_connections_link( $keyring_token_id, $path = '' ) { |
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return $this->get_link( '.1/me/publicize-connections/?keyring_connection_ID=%d', $keyring_token_id, $path ); |
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} |
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|
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function get_keyring_connection_link( $keyring_token_id, $path = '' ) { |
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return $this->get_link( '.1/me/keyring-connections/%d', $keyring_token_id, $path ); |
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} |
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|
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function get_external_service_link( $external_service, $path = '' ) { |
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return $this->get_link( '.1/meta/external-services/%s', $external_service, $path ); |
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} |
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|
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/** |
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* Try to find the closest supported version of an endpoint to the current endpoint |
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* |
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* For example, if we were looking at the path /animals/panda: |
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* - if the current endpoint is v1.3 and there is a v1.3 of /animals/%s available, we return 1.3 |
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* - if the current endpoint is v1.3 and there is no v1.3 of /animals/%s known, we fall back to the |
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* maximum available version of /animals/%s, e.g. 1.1 |
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* |
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* This method is used in get_link() to construct meta links for API responses. |
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* |
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* @param $template_path string The generic endpoint path, e.g. /sites/%s |
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* @param $path string The current endpoint path, relative to the version, e.g. /sites/12345 |
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* @param $request_method string Request method used to access the endpoint path |
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* @return string The current version, or otherwise the maximum version available |
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*/ |
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function get_closest_version_of_endpoint( $template_path, $path, $request_method = 'GET' ) { |
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$closest_endpoint_cache_by_version = & $this->closest_endpoint_cache_by_version; |
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|
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$closest_endpoint_cache = & $closest_endpoint_cache_by_version[ $this->api->version ]; |
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if ( !$closest_endpoint_cache ) { |
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$closest_endpoint_cache_by_version[ $this->api->version ] = array(); |
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$closest_endpoint_cache = & $closest_endpoint_cache_by_version[ $this->api->version ]; |
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} |
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|
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if ( ! isset( $closest_endpoint_cache[ $template_path ] ) ) { |
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$closest_endpoint_cache[ $template_path ] = array(); |
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} elseif ( isset( $closest_endpoint_cache[ $template_path ][ $request_method ] ) ) { |
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return $closest_endpoint_cache[ $template_path ][ $request_method ]; |
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} |
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|
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$path = untrailingslashit( $path ); |
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|
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// /help is a special case - always use the current request version |
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if ( wp_endswith( $path, '/help' ) ) { |
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$closest_endpoint_cache[ $template_path ][ $request_method ] = $this->api->version; |
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return $this->api->version; |
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} |
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|
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$matches_by_version = & $this->matches_by_version; |
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|
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// try to match out of saved matches |
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if ( ! isset( $matches_by_version[ $this->api->version ] ) ) { |
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$matches_by_version[ $this->api->version ] = array(); |
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} |
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foreach ( $matches_by_version[ $this->api->version ] as $match ) { |
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$regex = $match->regex; |
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if ( preg_match( "#^$regex\$#", $path ) ) { |
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$closest_endpoint_cache[ $template_path ][ $request_method ] = $match->version; |
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return $match->version; |
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} |
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} |
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|
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$endpoint_path_versions = $this->get_endpoint_path_versions(); |
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$last_path_segment = $this->get_last_segment_of_relative_path( $path ); |
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$max_version_found = null; |
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|
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foreach ( $endpoint_path_versions as $endpoint_last_path_segment => $endpoints ) { |
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|
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// Does the last part of the path match the path key? (e.g. 'posts') |
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// If the last part contains a placeholder (e.g. %s), we want to carry on |
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if ( $last_path_segment != $endpoint_last_path_segment && ! strstr( $endpoint_last_path_segment, '%' ) ) { |
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continue; |
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} |
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|
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foreach ( $endpoints as $endpoint ) { |
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// Does the request method match? |
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if ( ! in_array( $request_method, $endpoint['request_methods'] ) ) { |
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continue; |
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} |
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|
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$endpoint_path = untrailingslashit( $endpoint['path'] ); |
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$endpoint_path_regex = str_replace( array( '%s', '%d' ), array( '([^/?&]+)', '(\d+)' ), $endpoint_path ); |
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|
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if ( ! preg_match( "#^$endpoint_path_regex\$#", $path ) ) { |
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continue; |
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} |
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|
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// Make sure the endpoint exists at the same version |
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if ( version_compare( $this->api->version, $endpoint['min_version'], '>=') && |
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version_compare( $this->api->version, $endpoint['max_version'], '<=') ) { |
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array_push( |
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$matches_by_version[ $this->api->version ], |
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(object) array( 'version' => $this->api->version, 'regex' => $endpoint_path_regex ) |
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); |
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$closest_endpoint_cache[ $template_path ][ $request_method ] = $this->api->version; |
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return $this->api->version; |
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} |
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|
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// If the endpoint doesn't exist at the same version, record the max version we found |
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if ( empty( $max_version_found ) || version_compare( $max_version_found['version'], $endpoint['max_version'], '<' ) ) { |
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$max_version_found = array( 'version' => $endpoint['max_version'], 'regex' => $endpoint_path_regex ); |
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} |
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} |
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} |
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|
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// If the endpoint version is less than the requested endpoint version, return the max version found |
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if ( ! empty( $max_version_found ) ) { |
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array_push( |
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$matches_by_version[ $this->api->version ], |
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(object) $max_version_found |
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); |
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$closest_endpoint_cache[ $template_path ][ $request_method ] = $max_version_found['version']; |
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return $max_version_found['version']; |
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} |
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|
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// Otherwise, use the API version of the current request |
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return $this->api->version; |
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} |
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|
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/** |
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* Get an array of endpoint paths with their associated versions |
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* |
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* @return array Array of endpoint paths, min_versions and max_versions, keyed by last segment of path |
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**/ |
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protected function get_endpoint_path_versions() { |
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|
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if ( ! empty ( $this->cache_result ) ) { |
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return $this->cache_result; |
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} |
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|
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/* |
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* Create a map of endpoints and their min/max versions keyed by the last segment of the path (e.g. 'posts') |
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* This reduces the search space when finding endpoint matches in get_closest_version_of_endpoint() |
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*/ |
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$endpoint_path_versions = array(); |
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|
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foreach ( $this->api->endpoints as $key => $endpoint_objects ) { |
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|
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// The key contains a serialized path, min_version and max_version |
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list( $path, $min_version, $max_version ) = unserialize( $key ); |
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|
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// Grab the last component of the relative path to use as the top-level key |
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$last_path_segment = $this->get_last_segment_of_relative_path( $path ); |
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|
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$endpoint_path_versions[ $last_path_segment ][] = array( |
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'path' => $path, |
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'min_version' => $min_version, |
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'max_version' => $max_version, |
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'request_methods' => array_keys( $endpoint_objects ) |
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); |
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} |
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|
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$this->cache_result = $endpoint_path_versions; |
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|
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return $endpoint_path_versions; |
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} |
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|
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/** |
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* Grab the last segment of a relative path |
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* |
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* @param string $path Path |
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* @return string Last path segment |
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*/ |
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protected function get_last_segment_of_relative_path( $path) { |
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$path_parts = array_filter( explode( '/', $path ) ); |
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|
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if ( empty( $path_parts ) ) { |
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return null; |
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} |
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|
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return end( $path_parts ); |
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} |
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} |
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|
