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/* Copyright 2016 Software Freedom Conservancy Inc.
* Copyright 2017 Jens Georg <mail@jensge.org>
*
* This software is licensed under the GNU Lesser General Public License
* (version 2.1 or later). See the COPYING file in this distribution.
*/
namespace Publishing.RESTSupport.OAuth1 {
internal const string ENCODE_RFC_3986_EXTRA = "!*'();:@&=+$,/?%#[] \\";
public class Session : Publishing.RESTSupport.Session {
private string? request_phase_token = null;
private string? request_phase_token_secret = null;
private string? access_phase_token = null;
private string? access_phase_token_secret = null;
private string? username = null;
private string? consumer_key = null;
private string? consumer_secret = null;
public Session(string? endpoint_uri = null) {
base(endpoint_uri);
}
public override bool is_authenticated() {
return (access_phase_token != null && access_phase_token_secret != null &&
username != null);
}
public void authenticate_from_persistent_credentials(string token, string secret,
string username) {
this.access_phase_token = token;
this.access_phase_token_secret = secret;
this.username = username;
this.authenticated();
}
public void deauthenticate() {
access_phase_token = null;
access_phase_token_secret = null;
username = null;
}
public void set_api_credentials(string consumer_key, string consumer_secret) {
this.consumer_key = consumer_key;
this.consumer_secret = consumer_secret;
}
public string sign_transaction(Publishing.RESTSupport.Transaction txn,
Publishing.RESTSupport.Argument[]? extra_arguments = null) {
string http_method = txn.get_method().to_string();
debug("signing transaction with parameters:");
debug("HTTP method = " + http_method);
Publishing.RESTSupport.Argument[] base_string_arguments = txn.get_arguments();
foreach (var arg in extra_arguments) {
base_string_arguments += arg;
}
Publishing.RESTSupport.Argument[] sorted_args =
Publishing.RESTSupport.Argument.sort(base_string_arguments);
var arguments_string = Argument.serialize_list(sorted_args);
string? signing_key = null;
if (access_phase_token_secret != null) {
debug("access phase token secret available; using it as signing key");
signing_key = consumer_secret + "&" + access_phase_token_secret;
} else if (request_phase_token_secret != null) {
debug("request phase token secret available; using it as signing key");
signing_key = consumer_secret + "&" + request_phase_token_secret;
} else {
debug("neither access phase nor request phase token secrets available; using API " +
"key as signing key");
signing_key = consumer_secret + "&";
}
string signature_base_string = http_method + "&" + Soup.URI.encode(
txn.get_endpoint_url(), ENCODE_RFC_3986_EXTRA) + "&" +
Soup.URI.encode(arguments_string, ENCODE_RFC_3986_EXTRA);
debug("signature base string = '%s'", signature_base_string);
debug("signing key = '%s'", signing_key);
// compute the signature
string signature = RESTSupport.hmac_sha1(signing_key, signature_base_string);
signature = Soup.URI.encode(signature, ENCODE_RFC_3986_EXTRA);
debug("signature = '%s'", signature);
return signature;
}
public void set_request_phase_credentials(string token, string secret) {
this.request_phase_token = token;
this.request_phase_token_secret = secret;
}
public void set_access_phase_credentials(string token, string secret, string username) {
this.access_phase_token = token;
this.access_phase_token_secret = secret;
this.username = username;
authenticated();
}
public string get_oauth_nonce() {
TimeVal currtime = TimeVal();
currtime.get_current_time();
return Checksum.compute_for_string(ChecksumType.MD5, currtime.tv_sec.to_string() +
currtime.tv_usec.to_string());
}
public string get_oauth_timestamp() {
return GLib.get_real_time().to_string().substring(0, 10);
}
public string get_consumer_key() {
assert(consumer_key != null);
return consumer_key;
}
public string get_request_phase_token() {
assert(request_phase_token != null);
return request_phase_token;
}
public string get_access_phase_token() {
assert(access_phase_token != null);
return access_phase_token;
}
public bool has_access_phase_token() {
return access_phase_token != null;
}
public string get_access_phase_token_secret() {
assert(access_phase_token_secret != null);
return access_phase_token_secret;
}
public string get_username() {
assert(is_authenticated());
return username;
}
}
public class Transaction : Publishing.RESTSupport.Transaction {
public Transaction(Session session, Publishing.RESTSupport.HttpMethod method =
Publishing.RESTSupport.HttpMethod.POST) {
base(session, method);
setup_arguments();
}
public Transaction.with_uri(Session session, string uri,
Publishing.RESTSupport.HttpMethod method = Publishing.RESTSupport.HttpMethod.POST) {
base.with_endpoint_url(session, uri, method);
setup_arguments();
}
private void setup_arguments() {
var session = (Session) get_parent_session();
add_argument("oauth_nonce", session.get_oauth_nonce());
add_argument("oauth_signature_method", "HMAC-SHA1");
add_argument("oauth_version", "1.0");
add_argument("oauth_timestamp", session.get_oauth_timestamp());
add_argument("oauth_consumer_key", session.get_consumer_key());
if (session.has_access_phase_token()) {
add_argument("oauth_token", session.get_access_phase_token());
}
}
public override void execute() throws Spit.Publishing.PublishingError {
var signature = ((Session) get_parent_session()).sign_transaction(this);
add_argument("oauth_signature", signature);
base.execute();
}
}
public class UploadTransaction : Publishing.RESTSupport.UploadTransaction {
protected unowned Publishing.RESTSupport.OAuth1.Session session;
private Publishing.RESTSupport.Argument[] auth_header_fields;
public UploadTransaction(Publishing.RESTSupport.OAuth1.Session session,
Spit.Publishing.Publishable publishable,
string endpoint_uri) {
base.with_endpoint_url(session, publishable, endpoint_uri);
this.auth_header_fields = new Publishing.RESTSupport.Argument[0];
this.session = session;
add_authorization_header_field("oauth_nonce", session.get_oauth_nonce());
add_authorization_header_field("oauth_signature_method", "HMAC-SHA1");
add_authorization_header_field("oauth_version", "1.0");
add_authorization_header_field("oauth_timestamp", session.get_oauth_timestamp());
add_authorization_header_field("oauth_consumer_key", session.get_consumer_key());
add_authorization_header_field("oauth_token", session.get_access_phase_token());
}
public void add_authorization_header_field(string key, string value) {
auth_header_fields += new Publishing.RESTSupport.Argument(key, value);
}
public string get_authorization_header_string() {
return "OAuth " + Argument.serialize_list(auth_header_fields, true, ", ");
}
public void authorize() {
var signature = session.sign_transaction(this, auth_header_fields);
add_authorization_header_field("oauth_signature", signature);
string authorization_header = get_authorization_header_string();
debug("executing upload transaction: authorization header string = '%s'",
authorization_header);
add_header("Authorization", authorization_header);
}
}
}
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