age_number_max");

        foreach (range(1, $page_number_max) as $page_number) {
            array_push($listofurls, home_url(sprintf('/page/%s/', $page_number)));
        }

        // Attachments
        if ('attachment' == $postType) {
            $attachmentUrls = array();
            foreach (get_intermediate_image_sizes() as $size) {
                $attachmentSrc = wp_get_attachment_image_src($postId, $size);
                if (is_array($attachmentSrc) && !empty($attachmentSrc)) {
                    $attachmentUrls[] = $attachmentSrc[0];
                }
            }
            $listofurls = array_merge(
                $listofurls,
                $attachmentUrls
            );
        }

        // Clean array and get unique values
        $listofurls = array_values(array_filter(array_unique($listofurls)));

        // Purge https and http URLs
        if (function_exists('force_ssl_admin') && force_ssl_admin()) {
            $listofurls = array_merge($listofurls, str_replace('https://', 'http://', $listofurls));
        } elseif (!is_ssl() && function_exists('force_ssl_content') && force_ssl_content()) {
            $listofurls = array_merge($listofurls, str_replace('http://', 'https://', $listofurls));
        }

        return $listofurls;
    }

    protected function isPluginSpecificCacheEnabled()
    {
        $cacheSettingObject = $this->dataStore->getPluginSetting(\CF\API\Plugin::SETTING_PLUGIN_SPECIFIC_CACHE);

        if (!$cacheSettingObject) {
            return false;
        }

        $cacheSettingValue = $cacheSettingObject[\CF\API\Plugin::SETTING_VALUE_KEY];

        return $cacheSettingValue !== false
            && $cacheSettingValue !== 'off';
    }

    protected function isAutomaticPlatformOptimizationEnabled()
    {
        $cacheSettingObject = $this->dataStore->getPluginSetting(\CF\API\Plugin::SETTING_AUTOMATIC_PLATFORM_OPTIMIZATION);

        if (!$cacheSettingObject) {
            return false;
        }

        $cacheSettingValue = $cacheSettingObject[\CF\API\Plugin::SETTING_VALUE_KEY];

        return $cacheSettingValue !== false
            && $cacheSettingValue !== 'off';
    }

    protected function isAutomaticPlatformOptimizationCacheByDeviceTypeEnabled()
    {
        $cacheSettingObject = $this->dataStore->getPluginSetting(\CF\API\Plugin::SETTING_AUTOMATIC_PLATFORM_OPTIMIZATION_CACHE_BY_DEVICE_TYPE);

        if (!$cacheSettingObject) {
            return false;
        }

        $cacheSettingValue = $cacheSettingObject[\CF\API\Plugin::SETTING_VALUE_KEY];

        return $cacheSettingValue !== false
            && $cacheSettingValue !== 'off';
    }

    public function http2ServerPushInit()
    {
        HTTP2ServerPush::init();
    }

    /*
     * php://input can only be read once before PHP 5.6, try to grab it ONLY if the request
     * is coming from the cloudflare proxy.  We store it in a global so \CF\WordPress\Proxy
     * can act on the request body later on in the script execution.
     */
    public function getCloudflareRequestJSON()
    {
        if (isset($_GET['action']) && $_GET['action'] === self::WP_AJAX_ACTION) {
            $GLOBALS[self::CLOUDFLARE_JSON] = file_get_contents('php://input');
        }
    }

    public function initAutomaticPlatformOptimization()
    {
        // it could be too late to set the headers,
        // return early without triggering a warning in logs
        if (headers_sent()) {
            return;
        }

        // add header unconditionally so we can detect plugin is activated
        $cache = apply_filters('cloudflare_use_cache', !is_user_logged_in());
        if ($cache) {
            header('cf-edge-cache: cache,platform=wordpress');
        } else {
            header('cf-edge-cache: no-cache');
        }
    }

    public function purgeCacheOnPostStatusChange($new_status, $old_status, $post)
    {
        if ('publish' === $new_status || 'publish' === $old_status) {
            $this->purgeCacheByRelevantURLs($post->ID);
        }
    }

    public function purgeCacheOnCommentStatusChange($new_status, $old_status, $comment)
    {
        if (!isset($comment->comment_post_ID) || empty($comment->comment_post_ID)) {
            return; // nothing to do
        }

        // in case the comment status changed, and either old or new status is "approved", we need to purge cache for the corresponding post
        if (($old_status != $new_status) && (($old_status === 'approved') || ($new_status === 'approved'))) {
            $this->purgeCacheByRelevantURLs($comment->comment_post_ID);
            return;
        }
    }

    public function purgeCacheOnNewComment($comment_id, $comment_status, $comment_data)
    {
        if ($comment_status != 1) {
            return; // if comment is not approved, stop
        }
        if (!is_array($comment_data)) {
            return; // nothing to do
        }
        if (!array_key_exists('comment_post_ID', $comment_data)) {
            return; // nothing to do
        }

        // all clear, we ne need to purge cache related to this post id
        $this->purgeCacheByRelevantURLs($comment_data['comment_post_ID']);
    }

    /**
     * Accepts a page rule key and value to check if it exists in the page rules
     * provided.
     *
     * @param mixed $pagerules
     * @param mixed $key
     * @param mixed $value
     * @return bool
     */
    private function pageRuleContains($pagerules, $key, $value)
    {
        if (!is_array($pagerules)) {
            return false;
        }

        foreach ($pagerules as $pagerule) {
            foreach ($pagerule["actions"] as $action) {
                // always_use_https can only be toggled on for a URL but doesn't
                // have a value so we merely check the presence of the key
                // instead.
                if ($action["id"] == "always_use_https" && $key == "always_use_https") {
                    return true;
                }

                if (!array_key_exists("value", $action)) {
                    continue;
                }

                if ($action["id"] == $key && $action["value"] == $value) {
                    return true;
                }
            }
        }


        return false;
    }

    private function zoneSettingAlwaysUseHTTPSEnabled($zoneTag)
    {
        $settings = $this->api->getZoneSetting($zoneTag, "always_use_https");
        return !empty($settings["value"]) && $settings["value"] == "on";
    }


    /**
     * pathHasCachableFileExtension takes a string of a URL and evaluates if it
     * has a file extension that Cloudflare caches by default.
     *
     * @param mixed $value
     * @return bool
     */
    private function pathHasCachableFileExtension($value)
    {
        $parsed_url = parse_url($value, PHP_URL_PATH);

        foreach (self::CLOUDFLARE_CACHABLE_EXTENSIONS as $ext) {
            if (Utils::strEndsWith($parsed_url, "." . $ext)) {
                return true;
            }
        }

        return false;
    }

    /**
     * pathIsNotForFeeds accepts a string URL and checks if the path doesn't matches any
     * known feed paths such as "/feed", "/feed/", "/feed/rdf/", "/feed/rss/",
     * "/feed/atom/", "/author/foo/feed", "/comments/feed", "/shop/feed",
     * "/tag/.../feed/", etc.
     *
     * @param mixed $value
     * @return bool
     */
    private function pathIsNotForFeeds($value)
    {
        $parsed_url = parse_url($value, PHP_URL_PATH);
        return (bool) !preg_match('/\/feed(?:\/(?:atom\/?|r(?:df|ss)\/?)?)?$/', $parsed_url);
    }

    /**
     * urlIsHTTPS determines if a scheme used for a URL is HTTPS.
     *
     * @param mixed $value
     * @return bool
     */
    private function urlIsHTTPS($value)
    {
        $parsed_scheme = parse_url($value, PHP_URL_SCHEME);

        if ($parsed_scheme == "https") {
            return true;
        }

        return false;
    }
}