simpletweet.vala

using Rest;

public class SimpleTweet {
    private static const string CONSUMER_KEY = "#######################"; // this comes from your app's twitter account page
    private static const string CONSUMER_SECRET = "########################################"; // this comes from your app's twitter account page
    private static const string URL_FORMAT = "https://api.twitter.com";
    private static const string REQUEST_TOKEN_URL = "https://api.twitter.com/oauth/request_token";

    private static const string FUNCTION_ACCESS_TOKEN = "oauth/access_token";
    private static const string FUNCTION_STATUSES_UPDATE = "1/statuses/update.xml";

    private static const string PARAM_STATUS = "status";

    public static int main(string[] args) {
        // make sure there is a message to tweet
        if(args[1] == null || args[1] == "") {
            stdout.printf("No tweet message specified.\n");
            return 0;
        }

        /** Authenticating with Twitter */
        // initialize proxy
        var proxy = new OAuthProxy(CONSUMER_KEY, CONSUMER_SECRET, URL_FORMAT, false);

        // request token
        try {
            proxy.request_token("oauth/request_token", "oob");
        } catch (Error e) {
            stderr.printf("Couldn't get request token: %s\n", e.message);
            return 1;
        }

        // prompt user for pin
        stdout.printf("Go to http://twitter.com/oauth/authorize?oauth_token=%s then enter the PIN\n", proxy.get_token());
        string pin = stdin.read_line();

        // access token
        try { proxy.access_token(FUNCTION_ACCESS_TOKEN, pin); }
        catch (Error e) {
            stderr.printf("Couldn't get access token: %s\n", e.message);
            return 1;
        }

        /** sending the tweet */
        // setup call
        ProxyCall call = proxy.new_call();
        call.set_function(FUNCTION_STATUSES_UPDATE);
        call.set_method("POST");
        call.add_param(PARAM_STATUS, args[1]);
        try { call.sync(); } catch (Error e) {
            stderr.printf("Cannot make call: %s\n", e.message);
            return 1;
        }

        // print success
        stdout.printf("Tweet succeeded!\n");

        return 0;
    }
}