/**
* Attempt to find a valid output view based on the value of the
* HTTP_ACCEPT header. Setting the configured POST variable will
* cause the RESPONSE_TYPE header to be set to whatever you specify, while
* returning a body containing the type you actually requested.
*/
private function _detect_output_format()
{
// default output format
$this->_format = $this->DEFAULT_FORMAT;
$this->_view = self::$VALID_FORMAT_VIEWS[$this->_format];
if (isset($_SERVER['HTTP_ACCEPT'])) {
$accept_str = $_SERVER['HTTP_ACCEPT'];
$http_accept = new HTTP_Accept($accept_str);
// look for a supported format acceptable to the client
foreach (self::$VALID_FORMAT_VIEWS as $format => $view) {
// check if this format is in the client's HTTP_ACCEPT
if ($http_accept->isMatchExact($format)) {
$this->_format = $format;
$this->_view = $view;
if (isset($_POST[self::$MISMATCH_VARNAME])) {
$this->_format = $_POST[self::$MISMATCH_VARNAME];
}
return;
}
}
// check for an image-proxying url
if (preg_match('/^image/', $_SERVER['HTTP_ACCEPT']) && $this->ctrlr && isset($this->ctrlr->image_proxies)) {
foreach ($this->ctrlr->image_proxies as $name) {
if (preg_match("/{$name}\$/", $_SERVER['PHP_SELF'])) {
return;
}
}
}
// many browsers, including iPhone and IE7, send a */* meaning they
// are hopelessly promiscuous. Just send default format.
if (strpos($accept_str, '*/*') !== false) {
return;
}
// not found! Return a 415
show_error("Unsupported request format. Valid: {$accept_str}", 415);
}
}
/**
* Based on a requested mime type, attempts to find a view which can
* display that type. Valid views are configured in config/formats.php.
*
* @param string $req_format
* @return string $view
*/
protected function detect_view($req_format)
{
$http_accept = new HTTP_Accept($req_format);
// look for a supported format acceptable to the client
foreach (self::$VIEWS as $fmt => $vw) {
// check if this format is in the client's HTTP_ACCEPT
if ($http_accept->isMatchExact($fmt)) {
$this->http_view = $vw;
return $vw;
}
}
// no view found - 415
$accepts = implode(', ', array_keys(self::$VIEWS));
header("Accept: {$accepts}");
show_error("Unsupported request format: {$req_format}!", 415);
}