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<?php
namespace Shaarli\Api;
use Shaarli\Base64Url;
use Shaarli\Api\Exceptions\ApiAuthorizationException;
/**
* REST API utilities
*/
class ApiUtils
{
/**
* Validates a JWT token authenticity.
*
* @param string $token JWT token extracted from the headers.
* @param string $secret API secret set in the settings.
*
* @throws ApiAuthorizationException the token is not valid.
*/
public static function validateJwtToken($token, $secret)
{
$parts = explode('.', $token);
if (count($parts) != 3 || strlen($parts[0]) == 0 || strlen($parts[1]) == 0) {
throw new ApiAuthorizationException('Malformed JWT token');
}
$genSign = Base64Url::encode(hash_hmac('sha512', $parts[0] .'.'. $parts[1], $secret, true));
if ($parts[2] != $genSign) {
throw new ApiAuthorizationException('Invalid JWT signature');
}
$header = json_decode(Base64Url::decode($parts[0]));
if ($header === null) {
throw new ApiAuthorizationException('Invalid JWT header');
}
$payload = json_decode(Base64Url::decode($parts[1]));
if ($payload === null) {
throw new ApiAuthorizationException('Invalid JWT payload');
}
if (empty($payload->iat)
|| $payload->iat > time()
|| time() - $payload->iat > ApiMiddleware::$TOKEN_DURATION
) {
throw new ApiAuthorizationException('Invalid JWT issued time');
}
}
/**
* Format a Link for the REST API.
*
* @param array $link Link data read from the datastore.
* @param string $indexUrl Shaarli's index URL (used for relative URL).
*
* @return array Link data formatted for the REST API.
*/
public static function formatLink($link, $indexUrl)
{
$out['id'] = $link['id'];
// Not an internal link
if ($link['url'][0] != '?') {
$out['url'] = $link['url'];
} else {
$out['url'] = $indexUrl . $link['url'];
}
$out['shorturl'] = $link['shorturl'];
$out['title'] = $link['title'];
$out['description'] = $link['description'];
$out['tags'] = preg_split('/\s+/', $link['tags'], -1, PREG_SPLIT_NO_EMPTY);
$out['private'] = $link['private'] == true;
$out['created'] = $link['created']->format(\DateTime::ATOM);
if (! empty($link['updated'])) {
$out['updated'] = $link['updated']->format(\DateTime::ATOM);
} else {
$out['updated'] = '';
}
return $out;
}
/**
* Convert a link given through a request, to a valid link for LinkDB.
*
* If no URL is provided, it will generate a local note URL.
* If no title is provided, it will use the URL as title.
*
* @param array $input Request Link.
* @param bool $defaultPrivate Request Link.
*
* @return array Formatted link.
*/
public static function buildLinkFromRequest($input, $defaultPrivate)
{
$input['url'] = ! empty($input['url']) ? cleanup_url($input['url']) : '';
if (isset($input['private'])) {
$private = filter_var($input['private'], FILTER_VALIDATE_BOOLEAN);
} else {
$private = $defaultPrivate;
}
$link = [
'title' => ! empty($input['title']) ? $input['title'] : $input['url'],
'url' => $input['url'],
'description' => ! empty($input['description']) ? $input['description'] : '',
'tags' => ! empty($input['tags']) ? implode(' ', $input['tags']) : '',
'private' => $private,
'created' => new \DateTime(),
];
return $link;
}
/**
* Update link fields using an updated link object.
*
* @param array $oldLink data
* @param array $newLink data
*
* @return array $oldLink updated with $newLink values
*/
public static function updateLink($oldLink, $newLink)
{
foreach (['title', 'url', 'description', 'tags', 'private'] as $field) {
$oldLink[$field] = $newLink[$field];
}
$oldLink['updated'] = new \DateTime();
if (empty($oldLink['url'])) {
$oldLink['url'] = '?' . $oldLink['shorturl'];
}
if (empty($oldLink['title'])) {
$oldLink['title'] = $oldLink['url'];
}
return $oldLink;
}
/**
* Format a Tag for the REST API.
*
* @param string $tag Tag name
* @param int $occurrences Number of links using this tag
*
* @return array Link data formatted for the REST API.
*/
public static function formatTag($tag, $occurences)
{
return [
'name' => $tag,
'occurrences' => $occurences,
];
}
}
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