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namespace Guzzle\Http\Message\Header;
use Guzzle\Http\Message\Header;
/**
* Provides helpful functionality for link headers
*/
class Link extends Header
{
/**
* Add a link to the header
*
* @param string $url Link URL
* @param string $rel Link rel
* @param array $params Other link parameters
*
* @return self
*/
public function addLink($url, $rel, array $params = array())
{
$values = array("<{$url}>", "rel=\"{$rel}\"");
foreach ($params as $k => $v) {
$values[] = "{$k}=\"{$v}\"";
}
return $this->add(implode('; ', $values));
}
/**
* Check if a specific link exists for a given rel attribute
*
* @param string $rel rel value
*
* @return bool
*/
public function hasLink($rel)
{
return $this->getLink($rel) !== null;
}
/**
* Get a specific link for a given rel attribute
*
* @param string $rel Rel value
*
* @return array|null
*/
public function getLink($rel)
{
foreach ($this->getLinks() as $link) {
if (isset($link['rel']) && $link['rel'] == $rel) {
return $link;
}
}
return null;
}
/**
* Get an associative array of links
*
* For example:
* Link: <http:/.../front.jpeg>; rel=front; type="image/jpeg", <http://.../back.jpeg>; rel=back; type="image/jpeg"
*
* <code>
* var_export($response->getLinks());
* array(
* array(
* 'url' => 'http:/.../front.jpeg',
* 'rel' => 'back',
* 'type' => 'image/jpeg',
* )
* )
* </code>
*
* @return array
*/
public function getLinks()
{
$links = $this->parseParams();
foreach ($links as &$link) {
$key = key($link);
unset($link[$key]);
$link['url'] = trim($key, '<> ');
}
return $links;
}
}