/**
* Check if a file (or stream) is a valid image type
*
* @param string $file Can be a temporary filename (think $_FILE before saving to $filename) or a stream (string). Default is temporary filename
* @param string $filename
* @param bool $is_stream (optional)
*
* @return bool
*/
function is_valid_image($file, $filename, $is_stream = false)
{
$format = explode('.', $filename);
$format = strtolower(end($format));
// Extension
if (!('jpg' == $format || 'jpeg' == $format || 'gif' == $format || 'png' == $format)) {
return false;
}
if ($is_stream) {
$tmp_image_path = \Pressbooks\Utility\create_tmp_file();
file_put_contents($tmp_image_path, $file);
$file = $tmp_image_path;
}
$type = @exif_imagetype($file);
if (IMAGETYPE_JPEG == $type || IMAGETYPE_GIF == $type || IMAGETYPE_PNG == $type) {
return true;
} else {
return false;
}
}
/**
* 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, $fullpath)
{
if (isset($this->fetchedFontCache[$url])) {
return $this->fetchedFontCache[$url];
}
$response = wp_remote_get($url, array('timeout' => $this->timeout));
// WordPress error?
if (is_wp_error($response)) {
// TODO: handle $response->get_error_message();
$this->fetchedFontCache[$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}");
}
$this->fetchedFontCache[$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));
$filename = \Pressbooks\Sanitize\force_ascii($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;
}
function convert()
{
$this->outputPath = \Pressbooks\Utility\create_tmp_file();
return true;
}
/**
* Create a temporary file that automatically gets deleted on __sleep()
*
* @return string fullpath
*/
function createTmpFile()
{
return \Pressbooks\Utility\create_tmp_file();
}
/**
* @covers \Pressbooks\Utility\create_tmp_file
*/
public function test_create_tmp_file()
{
$file = \Pressbooks\Utility\create_tmp_file();
$this->assertFileExists($file);
file_put_contents($file, 'Hello world!');
$this->assertEquals('Hello world!', file_get_contents($file));
}
/**
* 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;
}