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<?php
namespace Flickr;
const FLICKR_API_KEY = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX';
const FLICKR_API_SECRET = 'XXXXXXXXXXXXXXXX';
class Flickr
{
public function __construct()
{
if (session_status() === PHP_SESSION_NONE) {
session_start();
}
}
public function authenticate()
{
if (isset($_SESSION['authenticated']) && $_SESSION['authenticated']) {
return;
}
if (isset($_GET['oauth_token']) && isset($_GET['oauth_verifier'])) {
$this->getAccessToken();
} else {
$this->getRequestToken();
}
}
public function uploadPhoto()
{
$oauth_data = $this->getOAuthParameters();
$oauth_data['oauth_token'] = $_SESSION['oauth_access_token'];
$oauth_data['title'] = $_POST['title'];
$oauth_data['tags'] = $_POST['tags'];
$upload_url = 'https://up.flickr.com/services/upload/';
$oauth_data['oauth_signature'] = $this->getSignature('POST', $upload_url, $oauth_data);
$oauth_data['photo'] = '@' . $_FILES['photo']['tmp_name'];
$curl = new Curl();
$curl->post($upload_url, $oauth_data);
return $curl;
}
private function getOAuthParameters()
{
return array(
'oauth_nonce' => md5(microtime() . mt_rand()),
'oauth_timestamp' => time(),
'oauth_consumer_key' => FLICKR_API_KEY,
'oauth_signature_method' => 'HMAC-SHA1',
'oauth_version' => '1.0',
);
}
private function getSignature($request_method, $url, $parameters)
{
ksort($parameters, SORT_STRING);
$request = implode('&', array(
rawurlencode($request_method),
rawurlencode($url),
rawurlencode(http_build_query($parameters, '', '&', PHP_QUERY_RFC3986)),
));
$key = FLICKR_API_SECRET . '&';
if (!empty($_SESSION['oauth_access_token_secret'])) {
$key .= $_SESSION['oauth_access_token_secret'];
} elseif (!empty($_SESSION['oauth_token_secret'])) {
$key .= $_SESSION['oauth_token_secret'];
}
$signature = base64_encode(hash_hmac('sha1', $request, $key, true));
return $signature;
}
private function getRequestToken()
{
$oauth_data = $this->getOAuthParameters();
$oauth_data['oauth_callback'] = implode('', array(
isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? 'https' : 'http',
'://',
$_SERVER['SERVER_NAME'],
$_SERVER['SCRIPT_NAME'],
));
$request_token_url = 'https://www.flickr.com/services/oauth/request_token';
$oauth_data['oauth_signature'] = $this->getSignature('POST', $request_token_url, $oauth_data);
$curl = new Curl();
$curl->post($request_token_url, $oauth_data);
parse_str($curl->response, $parts);
$_SESSION['oauth_token_secret'] = $parts['oauth_token_secret'];
// Continue to Flickr for user's authorization.
header('Location: https://secure.flickr.com/services/oauth/authorize?' . http_build_query(array(
'oauth_token' => $parts['oauth_token'],
'perms' => 'write',
)));
exit;
}
private function getAccessToken()
{
$oauth_data = $this->getOAuthParameters();
$oauth_data['oauth_token'] = $_GET['oauth_token'];
$oauth_data['oauth_verifier'] = $_GET['oauth_verifier'];
$access_token_url = 'https://www.flickr.com/services/oauth/access_token';
$oauth_data['oauth_signature'] = $this->getSignature('POST', $access_token_url, $oauth_data);
$curl = new Curl();
$curl->post($access_token_url, $oauth_data);
parse_str($curl->response, $parts);
$_SESSION['oauth_access_token'] = $parts['oauth_token'];
$_SESSION['oauth_access_token_secret'] = $parts['oauth_token_secret'];
$_SESSION['user_id'] = $parts['user_nsid'];
$_SESSION['authenticated'] = true;
}
}