/**
  * Fetch a font with wp_remote_get(), save it to $fullpath with a unique name.
  * Will return an empty string if something went wrong.
  *
  * @param $url string
  * @param $fullpath string
  *
  * @return string filename
  */
 protected function fetchAndSaveUniqueFont($url, $fullpath)
 {
     // Cheap cache
     static $already_done = array();
     if (isset($already_done[$url])) {
         return $already_done[$url];
     }
     $response = wp_remote_get($url, array('timeout' => $this->timeout));
     // WordPress error?
     if (is_wp_error($response)) {
         // TODO: handle $response->get_error_message();
         $already_done[$url] = '';
         return '';
     }
     // Basename without query string
     $filename = explode('?', basename($url));
     $filename = array_shift($filename);
     $filename = sanitize_file_name(urldecode($filename));
     $filename = Sanitize\force_ascii($filename);
     $tmp_file = \PressBooks\Utility\create_tmp_file();
     file_put_contents($tmp_file, wp_remote_retrieve_body($response));
     // TODO: Validate that this is actually a font
     // TODO: Refactor fetchAndSaveUniqueImage() and fetchAndSaveUniqueFont() into a single method, but "inject" different validation
     // Check for duplicates, save accordingly
     if (!file_exists("{$fullpath}/{$filename}")) {
         copy($tmp_file, "{$fullpath}/{$filename}");
     } elseif (md5(file_get_contents($tmp_file)) != md5(file_get_contents("{$fullpath}/{$filename}"))) {
         $filename = wp_unique_filename($fullpath, $filename);
         copy($tmp_file, "{$fullpath}/{$filename}");
     }
     $already_done[$url] = $filename;
     return $filename;
 }
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 /**
  * Fetch a url with wp_remote_get(), save it to $fullpath with a unique name.
  * Will return an empty string if something went wrong.
  *
  * @param string $url
  * @param string $fullpath
  * @return string|array
  */
 protected function fetchAndSaveUniqueMedia($url, $fullpath)
 {
     if (isset($this->fetchedMediaCache[$url])) {
         return $this->fetchedMediaCache[$url];
     }
     $response = wp_remote_get($url, array('timeout' => $this->timeout));
     // WordPress error?
     if (is_wp_error($response)) {
         // TODO: handle $response->get_error_message();
         $this->fetchedMediaCache[$url] = '';
         return '';
     }
     // Basename without query string
     $filename = explode('?', basename($url));
     $filename = array_shift($filename);
     $filename = sanitize_file_name(urldecode($filename));
     $filename = Sanitize\force_ascii($filename);
     $tmp_file = \PressBooks\Utility\create_tmp_file();
     file_put_contents($tmp_file, wp_remote_retrieve_body($response));
     if (!\PressBooks\Media\is_valid_media($tmp_file, $filename)) {
         $this->fetchedMediaCache[$url] = '';
         return '';
         // Not a valid media type
     }
     // Check for duplicates, save accordingly
     if (!file_exists("{$fullpath}/{$filename}")) {
         copy($tmp_file, "{$fullpath}/{$filename}");
     } elseif (md5(file_get_contents($tmp_file)) != md5(file_get_contents("{$fullpath}/{$filename}"))) {
         $filename = wp_unique_filename($fullpath, $filename);
         copy($tmp_file, "{$fullpath}/{$filename}");
     }
     $this->fetchedMediaCache[$url] = $filename;
     return $filename;
 }
 /**
  * Fetch an image with wp_remote_get(), save it to $fullpath with a unique name.
  * Will return an empty string if something went wrong.
  *
  * @param $url string
  * @param $fullpath string
  *
  * @return string filename
  */
 protected function fetchAndSaveUniqueImage($url, $fullpath)
 {
     // Cheap cache
     static $already_done = array();
     if (isset($already_done[$url])) {
         return $already_done[$url];
     }
     $response = wp_remote_get($url, array('timeout' => $this->timeout));
     // WordPress error?
     if (is_wp_error($response)) {
         // TODO: handle $response->get_error_message();
         $already_done[$url] = '';
         return '';
     }
     // Basename without query string
     $filename = explode('?', basename($url));
     // isolate latex image service from WP, add file extension
     if ('s.wordpress.com' == parse_url($url, PHP_URL_HOST) && 'latex.php' == $filename[0]) {
         $filename = md5(array_pop($filename));
         // content-type = 'image/png'
         $type = explode('/', $response['headers']['content-type']);
         $type = array_pop($type);
         $filename = $filename . "." . $type;
     } else {
         $filename = array_shift($filename);
         $filename = sanitize_file_name(urldecode($filename));
         $filename = Sanitize\force_ascii($filename);
     }
     $tmp_file = \PressBooks\Utility\create_tmp_file();
     file_put_contents($tmp_file, wp_remote_retrieve_body($response));
     if (!\PressBooks\Image\is_valid_image($tmp_file, $filename)) {
         $already_done[$url] = '';
         return '';
         // Not an image
     }
     if ($this->compressImages) {
         $format = explode('.', $filename);
         $format = strtolower(end($format));
         // Extension
         \PressBooks\Image\resize_down($format, $tmp_file);
     }
     // Check for duplicates, save accordingly
     if (!file_exists("{$fullpath}/{$filename}")) {
         copy($tmp_file, "{$fullpath}/{$filename}");
     } elseif (md5(file_get_contents($tmp_file)) != md5(file_get_contents("{$fullpath}/{$filename}"))) {
         $filename = wp_unique_filename($fullpath, $filename);
         copy($tmp_file, "{$fullpath}/{$filename}");
     }
     $already_done[$url] = $filename;
     return $filename;
 }
 /**
  * Fetch a url with wp_remote_get(), save it to $fullpath with a unique name.
  * Will return an empty string if something went wrong.
  *
  * @param string $url
  * @param string $fullpath
  * @return string|array
  */
 protected function fetchAndSaveUniqueMedia($url, $fullpath)
 {
     if (isset($this->fetchedMediaCache[$url])) {
         return $this->fetchedMediaCache[$url];
     }
     $response = wp_remote_get($url, array('timeout' => $this->timeout));
     // WordPress error?
     if (is_wp_error($response)) {
         try {
             // protocol relative urls handed to wp_remote_get will fail
             // try adding a protocol
             $protocol_relative = wp_parse_url($url);
             if (!isset($protocol_relative['scheme'])) {
                 if (true === is_ssl()) {
                     $url = 'https:' . $url;
                 } else {
                     $url = 'http:' . $url;
                 }
             }
             $response = wp_remote_get($url, array('timeout' => $this->timeout));
             if (is_wp_error($response)) {
                 throw new \Exception('Bad URL: ' . $url);
             }
         } catch (\Exception $exc) {
             $this->fetchedImageCache[$url] = '';
             error_log('\\PressBooks\\Export\\Epub3\\fetchAndSaveUniqueMedia wp_error on wp_remote_get() - ' . $response->get_error_message() . ' - ' . $exc->getMessage());
             return '';
         }
     }
     // Basename without query string
     $filename = explode('?', basename($url));
     $filename = array_shift($filename);
     $filename = sanitize_file_name(urldecode($filename));
     $filename = Sanitize\force_ascii($filename);
     $tmp_file = \Pressbooks\Utility\create_tmp_file();
     file_put_contents($tmp_file, wp_remote_retrieve_body($response));
     if (!\Pressbooks\Media\is_valid_media($tmp_file, $filename)) {
         $this->fetchedMediaCache[$url] = '';
         return '';
         // Not a valid media type
     }
     // Check for duplicates, save accordingly
     if (!file_exists("{$fullpath}/{$filename}")) {
         copy($tmp_file, "{$fullpath}/{$filename}");
     } elseif (md5(file_get_contents($tmp_file)) != md5(file_get_contents("{$fullpath}/{$filename}"))) {
         $filename = wp_unique_filename($fullpath, $filename);
         copy($tmp_file, "{$fullpath}/{$filename}");
     }
     $this->fetchedMediaCache[$url] = $filename;
     return $filename;
 }