Merge branch 'develop'

.travis.yml

@@ -10,6 +10,7 @@ env:
     - WP_VERSION=3.9 WP_MULTISITE=1
 
 before_script:
+    - composer self-update --1
     - composer install
 
 script:

assets/js/settings.js

@@ -24,6 +24,8 @@ const pageCacheLengthSimple = document.getElementById('sc_page_cache_length_simp
 const pageCacheLengthAdvanced = document.getElementById('sc_page_cache_length_advanced');
 const pageCacheLengthUnitSimple = document.getElementById('sc_page_cache_length_unit_simple');
 const pageCacheLengthUnitAdvanced = document.getElementById('sc_page_cache_length_unit_advanced');
+const pageRestApiCache = document.getElementById('sc_page_cache_enable_rest_api_cache');
+const pageRestoreHeaders = document.getElementById('sc_page_cache_restore_headers');
 const gzipCompressionSimple = document.getElementById('sc_enable_gzip_compression_simple');
 const gzipCompressionAdvanced = document.getElementById('sc_enable_gzip_compression_advanced');
 
@@ -41,6 +43,9 @@ $advancedModeToggle.on('change', (event) => {
 		pageCacheLengthUnitSimple.disabled = true;
 		pageCacheLengthUnitAdvanced.disabled = false;
 
+		pageRestApiCache.disabled = false;
+		pageRestoreHeaders.disabled = false;
+
 		if (gzipCompressionSimple) {
 			gzipCompressionSimple.disabled = true;
 			gzipCompressionAdvanced.disabled = false;
@@ -58,6 +63,9 @@ $advancedModeToggle.on('change', (event) => {
 		pageCacheLengthUnitSimple.disabled = false;
 		pageCacheLengthUnitAdvanced.disabled = true;
 
+		pageRestApiCache.disabled = true;
+		pageRestoreHeaders.disabled = true;
+
 		if (gzipCompressionSimple) {
 			gzipCompressionSimple.disabled = false;
 			gzipCompressionAdvanced.disabled = true;

inc/class-sc-advanced-cache.php

@@ -96,12 +96,19 @@ public function purge_post_on_comment( $comment_id, $approved, $commentdata ) {
 	 * @since  1.3
 	 */
 	public function purge_post_on_update( $post_id ) {
-		$post_type = get_post_type( $post_id );
+		$post = get_post( $post_id );
 
-		if ( ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) || 'revision' === $post_type ) {
+		// Do not purge the cache if it's an autosave or it is updating a revision.
+		if ( ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) || 'revision' === $post->post_type ) {
 			return;
+
+			// Do not purge the cache if the user cannot edit the post.
 		} elseif ( ! current_user_can( 'edit_post', $post_id ) && ( ! defined( 'DOING_CRON' ) || ! DOING_CRON ) ) {
 			return;
+
+			// Do not purge the cache if the user is editing an unpublished post.
+		} elseif ( 'draft' === $post->post_status ) {
+			return;
 		}
 
 		$config = SC_Config::factory()->get();

inc/class-sc-config.php

@@ -29,39 +29,47 @@ class SC_Config {
 	public function __construct() {
 
 		$this->defaults = array(
-			'enable_page_caching'             => array(
+			'enable_page_caching'              => array(
 				'default'   => false,
 				'sanitizer' => array( $this, 'boolval' ),
 			),
-			'advanced_mode'                   => array(
+			'advanced_mode'                    => array(
 				'default'   => false,
 				'sanitizer' => array( $this, 'boolval' ),
 			),
-			'enable_in_memory_object_caching' => array(
+			'enable_in_memory_object_caching'  => array(
 				'default'   => false,
 				'sanitizer' => array( $this, 'boolval' ),
 			),
-			'enable_gzip_compression'         => array(
+			'enable_gzip_compression'          => array(
 				'default'   => false,
 				'sanitizer' => array( $this, 'boolval' ),
 			),
-			'in_memory_cache'                 => array(
+			'in_memory_cache'                  => array(
 				'default'   => 'memcached',
 				'sanitizer' => 'sanitize_text_field',
 			),
-			'page_cache_length'               => array(
+			'page_cache_length'                => array(
 				'default'   => 24,
 				'sanitizer' => 'absint',
 			),
-			'page_cache_length_unit'          => array(
+			'page_cache_length_unit'           => array(
 				'default'   => 'hours',
 				'sanitizer' => array( $this, 'sanitize_length_unit' ),
 			),
-			'cache_exception_urls'            => array(
+			'cache_exception_urls'             => array(
 				'default'   => '',
 				'sanitizer' => 'wp_kses_post',
 			),
-			'enable_url_exemption_regex'      => array(
+			'enable_url_exemption_regex'       => array(
+				'default'   => false,
+				'sanitizer' => array( $this, 'boolval' ),
+			),
+			'page_cache_enable_rest_api_cache' => array(
+				'default'   => false,
+				'sanitizer' => array( $this, 'boolval' ),
+			),
+			'page_cache_restore_headers'       => array(
 				'default'   => false,
 				'sanitizer' => array( $this, 'boolval' ),
 			),

inc/class-sc-settings.php

@@ -306,6 +306,29 @@ public function screen_options() {
 								</select>
 							</td>
 						</tr>
+
+						<tr>
+							<th scope="row"><label for="sc_page_cache_enable_rest_api_cache"><?php esc_html_e( 'Cache REST API', 'simple-cache' ); ?></label></th>
+							<td>
+								<select <?php if ( empty( $config['advanced_mode'] ) ) : ?>disabled<?php endif; ?> name="sc_simple_cache[page_cache_enable_rest_api_cache]" id="sc_page_cache_enable_rest_api_cache">
+									<option value="0"><?php esc_html_e( 'No', 'simple-cache' ); ?></option>
+									<option <?php selected( $config['page_cache_enable_rest_api_cache'], true ); ?> value="1"><?php esc_html_e( 'Yes', 'simple-cache' ); ?></option>
+								</select>
+								<p class="description"><?php esc_html_e( 'When enabled, the REST API requests will be cached.', 'simple-cache' ); ?></p>
+							</td>
+						</tr>
+
+						<tr>
+							<th scope="row"><label for="sc_page_cache_restore_headers"><?php esc_html_e( 'Restore Headers', 'simple-cache' ); ?></label></th>
+							<td>
+								<select <?php if ( empty( $config['advanced_mode'] ) ) : ?>disabled<?php endif; ?> name="sc_simple_cache[page_cache_restore_headers]" id="sc_page_cache_restore_headers">
+									<option value="0"><?php esc_html_e( 'No', 'simple-cache' ); ?></option>
+									<option <?php selected( $config['page_cache_restore_headers'], true ); ?> value="1"><?php esc_html_e( 'Yes', 'simple-cache' ); ?></option>
+								</select>
+								<p class="description"><?php esc_html_e( 'When enabled, the plugin will save the response headers present when the page is cached and it will send send them again when it serves the cached page. This is recommended when caching the REST API.', 'simple-cache' ); ?></p>
+							</td>
+						</tr>
+
 						<tr>
 							<th scope="row" colspan="2">
 								<h2 class="cache-title"><?php esc_html_e( 'Object Cache (Redis or Memcached)', 'simple-cache' ); ?></h2>

inc/dropins/file-based-page-cache.php

@@ -7,7 +7,7 @@
 
 defined( 'ABSPATH' ) || exit;
 
-if ( ! function_exists('sc_serve_file_cache') ) {
+if ( ! function_exists( 'sc_serve_file_cache' ) ) {
 	return;
 }
 

inc/pre-wp-functions.php

@@ -19,7 +19,8 @@ function sc_file_cache( $buffer, $flags ) {
 
 	$cache_dir = sc_get_cache_dir();
 
-	if ( mb_strlen( $buffer ) < 255 ) {
+	// Don't cache small requests unless it's a REST API request.
+	if ( mb_strlen( $buffer ) < 255 && ( ! defined( 'REST_REQUEST' ) || ! mb_strlen( $buffer ) > 0 ) ) {
 		return $buffer;
 	}
 
@@ -28,6 +29,11 @@ function sc_file_cache( $buffer, $flags ) {
 		return $buffer;
 	}
 
+	// Do not cache the REST API if the user has not opted-in or it's an authenticated REST API request.
+	if ( defined( 'REST_REQUEST' ) && REST_REQUEST && ( empty( $GLOBALS['sc_config']['page_cache_enable_rest_api_cache'] ) || ! empty( $_SERVER['HTTP_AUTHORIZATION'] ) ) ) {
+		return $buffer;
+	}
+
 	// Make sure we can read/write files to cache dir parent
 	if ( ! file_exists( dirname( $cache_dir ) ) ) {
 		if ( ! @mkdir( dirname( $cache_dir ) ) ) {
@@ -67,6 +73,13 @@ function sc_file_cache( $buffer, $flags ) {
 
 	$modified_time = time(); // Make sure modified time is consistent.
 
+	$file_extension = '.html';
+
+	// Store JSON files for the REST API.
+	if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
+		$file_extension = '.json';
+	}
+
 	// Prevent mixed content when there's an http request but the site URL uses https.
 	$home_url = get_home_url();
 
@@ -82,16 +95,24 @@ function sc_file_cache( $buffer, $flags ) {
 		$buffer .= "\n<!-- Cache served by Simple Cache - Last modified: " . gmdate( 'D, d M Y H:i:s', $modified_time ) . " GMT -->\n";
 	}
 
+	// Save the response body.
 	if ( ! empty( $GLOBALS['sc_config']['enable_gzip_compression'] ) && function_exists( 'gzencode' ) ) {
-		file_put_contents( $path . '/index.gzip.html', gzencode( $buffer, 3 ) );
-		touch( $path . '/index.gzip.html', $modified_time );
+		file_put_contents( $path . '/index.gzip' . $file_extension, gzencode( $buffer, 3 ) );
+		touch( $path . '/index.gzip' . $file_extension, $modified_time );
 	} else {
-		file_put_contents( $path . '/index.html', $buffer );
-		touch( $path . '/index.html', $modified_time );
+		file_put_contents( $path . '/index' . $file_extension, $buffer );
+		touch( $path . '/index' . $file_extension, $modified_time );
+	}
+
+	// Save the resonse headers.
+	if ( ! empty( $GLOBALS['sc_config']['page_cache_restore_headers'] ) ) {
+		file_put_contents( $path . '/headers.json', wp_json_encode( headers_list() ) );
 	}
 
 	header( 'Cache-Control: no-cache' ); // Check back every time to see if re-download is necessary.
 
+	header( 'X-Simple-Cache: MISS' );
+
 	header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', $modified_time ) . ' GMT' );
 
 	if ( function_exists( 'ob_gzhandler' ) && ! empty( $GLOBALS['sc_config']['enable_gzip_compression'] ) ) {
@@ -131,17 +152,24 @@ function sc_get_cache_path() {
 function sc_serve_file_cache() {
 	$cache_dir = ( defined( 'SC_CACHE_DIR' ) ) ? rtrim( SC_CACHE_DIR, '/' ) : rtrim( WP_CONTENT_DIR, '/' ) . '/cache/simple-cache';
 
-	$file_name = 'index.html';
+	$file_name = 'index.';
 
 	if ( function_exists( 'gzencode' ) && ! empty( $GLOBALS['sc_config']['enable_gzip_compression'] ) ) {
-		$file_name = 'index.gzip.html';
+		$file_name = 'index.gzip.';
 	}
 
-	$path = $cache_dir . '/' . rtrim( sc_get_url_path(), '/' ) . '/' . $file_name;
+	$html_path   = $cache_dir . '/' . rtrim( sc_get_url_path(), '/' ) . '/' . $file_name . 'html';
+	$json_path   = $cache_dir . '/' . rtrim( sc_get_url_path(), '/' ) . '/' . $file_name . 'json';
+	$header_path = $cache_dir . '/' . rtrim( sc_get_url_path(), '/' ) . '/headers.json';
 
-	$modified_time = (int) @filemtime( $path );
+	if ( @file_exists( $html_path ) && @is_readable( $html_path ) ) {
+		$path = $html_path;
+	} elseif ( @file_exists( $json_path ) && @is_readable( $json_path ) ) {
+		$path = $json_path;
+		header( 'Content-Type: application/json; charset=UTF-8' );
+	}
 
-	header( 'Cache-Control: no-cache' ); // Check back in an hour.
+	$modified_time = (int) @filemtime( $path );
 
 	if ( ! empty( $modified_time ) && ! empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) && strtotime( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) === $modified_time ) {
 		if ( function_exists( 'gzencode' ) && ! empty( $GLOBALS['sc_config']['enable_gzip_compression'] ) ) {
@@ -152,11 +180,25 @@ function sc_serve_file_cache() {
 		exit;
 	}
 
-	if ( @file_exists( $path ) && @is_readable( $path ) ) {
+	if ( isset( $path ) ) {
+
+		// Restore the headers if a `header.json` file is found.
+		if ( @file_exists( $header_path ) && @is_readable( $header_path ) ) {
+			$headers = json_decode( @file_get_contents( $header_path ) );
+			foreach ( $headers as $header ) {
+				header( $header );
+			}
+		} else {
+			header( 'Cache-Control: no-cache' );
+		}
+
+		// Set the GZIP header if we are serving gzipped content.
 		if ( function_exists( 'gzencode' ) && ! empty( $GLOBALS['sc_config']['enable_gzip_compression'] ) ) {
 			header( 'Content-Encoding: gzip' );
 		}
 
+		header( 'X-Simple-Cache: HIT' );
+
 		@readfile( $path );
 
 		exit;