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lmarkus/SlackPGP.js

Created May 27, 2016 08:30
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  1. Lenny Markus created this gist May 27, 2016.
    118 changes: 118 additions & 0 deletions SlackPGP.js
    View file
    Original file line number Diff line number Diff line change
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    // ==UserScript==
    // @name SlackPGP
    // @namespace slack
    // @description slackPGP
    // @include https://*.slack.com/messages/*
    // @version 1
    // @grant none
    // ==/UserScript==


    //Evil globals
    var publicKey = "0xDEADBEEF";
    var privateKey = "";
    var peerPublicKey;
    var iStartedPGP;
    var lastSent;
    var myPeerId;

    //Monkey patch Slack's message submit.
    var submit = TS.view.submit;


    function sendPublicKey() {
    $('#message-input').val('handshake:' + publicKey);
    submit();
    }

    /**
    * Detect the other persons ID
    * I can grab this from data hiding in the direct message channel title
    */
    function getPeerId() {
    myPeerId = myPeerId || $('#channel_header_info').find('span.presence').data('member-presence');
    return myPeerId;
    console.log('Peer: ' + myPeerId);

    }

    /**
    Who sent this message? Me or my peer?
    */
    function isFromPeer(senderId) {
    return getPeerId() === senderId;
    }

    /**
    * Drop in your favorite PGP library here....
    */
    function encrypt(message, callback) {
    setTimeout(function () {
    console.log('encrypting with ', peerPublicKey);
    return callback('%' + message + '%');
    }, 0)
    }

    function decrypt(message, callback) {
    setTimeout(function () {
    console.log('dec using ', privateKey);
    return callback(message.replace(/%/g, ''));
    }, 0)
    }


    //Detect new message received. There's probably an event to hook into, but I'm lazy :)
    $('#msgs_div').on('DOMNodeInserted', function (e) {
    var target = $(e.target);
    if (target.is('ts-message:not(.bot_message):not(.unprocessed)')) {//Ignore non-useful slack messages
    console.log('message received!');
    var container = target.find('.message_body');
    var text = container.html();
    var senderId = target.find('.message_sender').data('member-id');
    console.log(senderId + ':', text);

    if (isFromPeer(senderId)) {

    // Check to see if we're establishing the handshake
    if (text.match('^handshake:')) {
    peerPublicKey = text.split(':')[1];
    console.log('Received Key from peer');
    if (!iStartedPGP) { //If I didn't start, then send them my public key.
    sendPublicKey();
    }
    console.log('Handshake complete');
    return;
    }

    // Otherwise decrypt the received text, and replace inline
    decrypt(text, function (plainText) {
    container.html(plainText);
    });
    }

    else {
    //Replace my encrypted text with plain, just on this client
    container.html(lastSent)
    }
    }
    });


    /**
    * Monkey Patch outgoing messages to make sure they're encrypted
    */
    TS.view.submit = function () {

    var message = lastSent = $('#message-input').val();

    // Special case to begin an encrypted session.
    if (message === 'pgp') {
    iStartedPGP = true;
    return sendPublicKey();
    }

    encrypt(message, function (encMessage) {
    $('#message-input').val(encMessage);
    submit();
    })
    };