1 package stemmaweb::Authentication::Credential::Google;
3 use Crypt::OpenSSL::X509;
8 use LWP::Simple qw(get);
9 use Date::Parse qw(str2time);
17 stemmaweb::Authentication::Google - JSON Web Token handler for Google tokens.
21 Retrieves Google's public certificates, and then retrieves the key from the
22 cert using L<Crypt::OpenSSL::X509>. Finally, uses the pubkey to decrypt a
23 Google token using L<JSON::WebToken>.
28 my ($class, $config, $app, $realm) = @_;
29 $class = ref $class || $class;
41 my ($self, $c, $realm, $authinfo) =@_;
43 my $id_token = $authinfo->{id_token};
44 $id_token ||= $c->req->method eq 'GET' ?
45 $c->req->query_params->{id_token} : $c->req->body_params->{id_token};
48 Catalyst::Exception->throw("id_token not specified.");
51 my $userinfo = $self->decode($id_token);
53 my $sub = $userinfo->{sub};
54 my $openid = $userinfo->{openid_id};
56 if (!$sub || !$openid) {
57 Catalyst::Exception->throw(
58 'Could not retrieve sub and openid from token! Is the token
63 return $realm->find_user($userinfo, $c);
70 Retrieves a pair of JSON-encoded certificates from the given URL (defaults to
71 Google's public cert url), and returns the decoded JSON object.
79 Optional. Location where certificates are located.
80 Defaults to https://www.googleapis.com/oauth2/v1/certs.
86 Decoded JSON object containing certificates.
91 my ($self, $url) = @_;
93 $url ||= ( $self->{_app}->config->{'Authentication::Credential::Google'}->{public_cert_url} || 'https://www.googleapis.com/oauth2/v1/certs' );
94 return decode_json(get($url));
97 =head2 get_key_from_cert
99 Given a pair of certificates $certs (defaults to L</retrieve_certs>),
100 this function returns the public key of the cert identified by $kid.
108 Required. Index of the certificate hash $hash where the cert we want is
113 Optional. A (hashref) pair of certificates.
114 It's retrieved using L</retrieve_certs> if not given,
115 or if the pair is expired.
121 Public key of certificate.
125 sub get_key_from_cert {
126 my ($self, $kid, $certs) = @_;
128 $certs ||= $self->retrieve_certs;
129 my $cert = $certs->{$kid};
130 my $x509 = Crypt::OpenSSL::X509->new_from_string($cert);
132 if ($self->is_cert_expired($x509)) {
133 # If we ended up here, we were given
134 # an old $certs string from the user.
135 # Let's force getting another.
136 return $self->get_key_from_cert($kid);
139 return $x509->pubkey;
142 =head2 is_cert_expired
144 Returns if a given L<Crypt::OpenSSL::X509> certificate is expired.
148 sub is_cert_expired {
149 my ($self, $x509) = @_;
151 my $expiry = str2time($x509->notAfter);
153 return time > $expiry;
158 Returns the decoded information contained in a user's token.
166 Required. The user's token from Google+.
170 Optional. A public key string with which to decode the token.
171 If not given, the public key will be retrieved from $certs.
175 Optional. A pair of public key certs retrieved from Google.
176 If not given, or if the certificates have expired, a new
177 pair of certificates is retrieved.
183 Decoded JSON object from the decrypted token.
188 my ($self, $token, $certs, $pubkey) = @_;
191 my $details = decode_json(
192 MIME::Base64::decode_base64(
193 substr( $token, 0, CORE::index($token, '.') )
197 my $kid = $details->{kid};
198 $pubkey = $self->get_key_from_cert($kid, $certs);
201 return JSON::WebToken->decode($token, $pubkey);
206 Errietta Kostala <e.kostala@shadowcat.co.uk>
210 This library is free software. You can redistribute it and/or modify
211 it under the same terms as Perl itself.