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token.php
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token.php
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<?php
header('HTTP/1.0 500 Internal Server Error');
header("Access-Control-Allow-Origin: *");
function error($msg)
{
header('HTTP/1.0 400 Bad Request');
header('Content-type: text/plain; charset=utf-8');
echo $msg . "\n";
exit(1);
}
function verifyParameter($givenParams, $paramName)
{
if (!isset($givenParams[$paramName])) {
error('"' . $paramName . '" parameter missing');
}
return $givenParams[$paramName];
}
function verifyUrlParameter($givenParams, $paramName)
{
verifyParameter($givenParams, $paramName);
$url = parse_url($givenParams[$paramName]);
if (!isset($url['scheme'])) {
error('Invalid URL in "' . $paramName . '" parameter: scheme missing');
}
if (!isset($url['host'])) {
error('Invalid URL in "' . $paramName . '" parameter: host missing');
}
return $givenParams[$paramName];
}
function getOptionalParameter($givenParams, $paramName, $default)
{
if (!isset($givenParams[$paramName])) {
return $default;
}
return $givenParams[$paramName];
}
if ($_SERVER['REQUEST_METHOD'] == 'GET') {
//verify token
if (isset($_SERVER['HTTP_AUTHORIZATION'])) {
$auth = $_SERVER['HTTP_AUTHORIZATION'];
} else if (isset($_SERVER['REDIRECT_HTTP_AUTHORIZATION'])) {
//php-cgi has it there
$auth = $_SERVER['REDIRECT_HTTP_AUTHORIZATION'];
} else {
error('Authorization HTTP header missing');
}
$parts = explode(' ', $auth, 2);
if (count($parts) != 2) {
error('Authorization header must container "Bearer" and the token');
}
list($bearer, $token) = $parts;
if ($bearer !== 'Bearer') {
error('Authorization header must start with "Bearer"');
}
//FIXME: use real decryption
$encData = base64_decode($token);
if ($encData === false) {
error('Invalid token data');
}
parse_str($encData, $data);
$emoji = verifyParameter($data, 'emoji');
$signature = verifyParameter($data, 'signature');
$me = verifyUrlParameter($data, 'me');
$client_id = verifyUrlParameter($data, 'client_id');
$scope = verifyParameter($data, 'scope');
if ($emoji != '\360\237\222\251') {
error('Dog poo missing');
}
if ($signature != 'FIXME') {
error('Invalid signature');
}
header('HTTP/1.0 200 OK');
header('Content-type: application/json');
echo json_encode(
array(
'me' => $me,
'client_id' => $client_id,
'scope' => $scope,
)
);
} else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
//generate token
//we ignore the "me" parameter; it's for proxies only
// see https://github.com/cweiske/anoweco/issues/3
$redirect_uri = verifyUrlParameter($_POST, 'redirect_uri');
$client_id = verifyUrlParameter($_POST, 'client_id');
$code = verifyParameter($_POST, 'code');//auth token
$state = getOptionalParameter($_POST, 'state', null);
//verify auth code
parse_str(base64_decode($code), $codeParts);
$emoji = verifyParameter($codeParts, 'emoji');
$signature = verifyParameter($codeParts, 'signature');
$me = verifyUrlParameter($codeParts, 'me');
if ($emoji != '\360\237\222\251') {
error('Auth token: Dog poo missing');
}
if ($signature != 'FIXME') {
error('Auth token: Invalid signature');
}
//FIXME: check if state are set
//FIXME: check auth endpoint if parameters are valid
// and to get the scope
$scope = 'post';
//FIXME: use real encryption
$access_token = base64_encode(
http_build_query(
array(
'emoji' => '\360\237\222\251',
'me' => $me,
'client_id' => $client_id,
'scope' => $scope,
'signature' => 'FIXME',
)
)
);
header('HTTP/1.0 200 OK');
header('Content-type: application/json');
echo json_encode(
array(
'access_token' => $access_token,
'token_type' => 'Bearer',
'me' => $me,
'scope' => $scope
)
);
}
?>