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461 lines
16 KiB
461 lines
16 KiB
/**
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* ZeroBin
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*
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* a zero-knowledge paste bin
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*
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* @link http://sebsauvage.net/wiki/doku.php?id=php:zerobin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 0.15
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*/
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// Immediately start random number generator collector.
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sjcl.random.startCollectors();
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/**
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* Converts a duration (in seconds) into human readable format.
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*
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* @param int seconds
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* @return string
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*/
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function secondsToHuman(seconds)
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{
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if (seconds<60) { var v=Math.floor(seconds); return v+' second'+((v>1)?'s':''); }
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if (seconds<60*60) { var v=Math.floor(seconds/60); return v+' minute'+((v>1)?'s':''); }
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if (seconds<60*60*24) { var v=Math.floor(seconds/(60*60)); return v+' hour'+((v>1)?'s':''); }
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// If less than 2 months, display in days:
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if (seconds<60*60*24*60) { var v=Math.floor(seconds/(60*60*24)); return v+' day'+((v>1)?'s':''); }
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var v=Math.floor(seconds/(60*60*24*30)); return v+' month'+((v>1)?'s':'');
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}
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/**
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* Compress a message (deflate compression). Returns base64 encoded data.
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*
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* @param string message
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* @return base64 string data
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*/
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function compress(message) {
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return Base64.toBase64( RawDeflate.deflate( Base64.utob(message) ) );
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}
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/**
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* Decompress a message compressed with compress().
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*/
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function decompress(data) {
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return Base64.btou( RawDeflate.inflate( Base64.fromBase64(data) ) );
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}
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/**
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* Compress, then encrypt message with key.
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*
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* @param string key
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* @param string message
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* @return encrypted string data
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*/
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function zeroCipher(key, message) {
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return sjcl.encrypt(key,compress(message));
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}
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/**
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* Decrypt message with key, then decompress.
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*
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* @param key
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* @param encrypted string data
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* @return string readable message
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*/
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function zeroDecipher(key, data) {
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return decompress(sjcl.decrypt(key,data));
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}
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/**
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* @return the current script location (without search or hash part of the URL).
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* eg. http://server.com/zero/?aaaa#bbbb --> http://server.com/zero/
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*/
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function scriptLocation() {
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return window.location.href.substring(0,window.location.href.length
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-window.location.search.length -window.location.hash.length);
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}
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/**
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* @return the paste unique identifier from the URL
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* eg. 'c05354954c49a487'
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*/
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function pasteID() {
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return window.location.search.substring(1);
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}
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/**
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* Set text of a DOM element (required for IE)
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* This is equivalent to element.text(text)
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* @param object element : a DOM element.
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* @param string text : the text to enter.
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*/
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function setElementText(element, text) {
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// For IE<10.
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if ($('div#oldienotice').is(":visible")) {
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// IE<10 do not support white-space:pre-wrap; so we have to do this BIG UGLY STINKING THING.
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element.text(text.replace(/\n/ig,'{BIG_UGLY_STINKING_THING__OH_GOD_I_HATE_IE}'));
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element.html(element.text().replace(/{BIG_UGLY_STINKING_THING__OH_GOD_I_HATE_IE}/ig,"\n<br />"));
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}
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// for other (sane) browsers:
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else {
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element.text(text);
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}
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}
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/**
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* Show decrypted text in the display area, including discussion (if open)
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*
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* @param string key : decryption key
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* @param array comments : Array of messages to display (items = array with keys ('data','meta')
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*/
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function displayMessages(key, comments) {
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try { // Try to decrypt the paste.
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var cleartext = zeroDecipher(key, comments[0].data);
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} catch(err) {
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$('div#cleartext').addClass('hidden');
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$('div#prettymessage').addClass('hidden');
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$('button#clonebutton').addClass('hidden');
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showError('Could not decrypt data (Wrong key ?)');
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return;
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}
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setElementText($('div#cleartext'), cleartext);
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setElementText($('pre#prettyprint'), cleartext);
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urls2links($('div#cleartext')); // Convert URLs to clickable links.
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prettyPrint();
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// Display paste expiration.
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if (comments[0].meta.expire_date) $('div#remainingtime').removeClass('foryoureyesonly').text('This document will expire in '+secondsToHuman(comments[0].meta.remaining_time)+'.').removeClass('hidden');
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if (comments[0].meta.burnafterreading) {
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$('div#remainingtime').addClass('foryoureyesonly').text('FOR YOUR EYES ONLY. Don\'t close this window, this message can\'t be displayed again.').removeClass('hidden');
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$('button#clonebutton').addClass('hidden'); // Discourage cloning (as it can't really be prevented).
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}
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// If the discussion is opened on this paste, display it.
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if (comments[0].meta.opendiscussion) {
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$('div#comments').html('');
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// For each comment.
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for (var i = 1; i < comments.length; i++) {
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var comment=comments[i];
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var cleartext="[Could not decrypt comment ; Wrong key ?]";
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try {
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cleartext = zeroDecipher(key, comment.data);
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} catch(err) { }
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var place = $('div#comments');
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// If parent comment exists, display below (CSS will automatically shift it right.)
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var cname = 'div#comment_'+comment.meta.parentid
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// If the element exists in page
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if ($(cname).length) {
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place = $(cname);
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}
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var divComment = $('<article><div class="comment" id="comment_' + comment.meta.commentid+'">'
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+ '<div class="commentmeta"><span class="nickname"></span><span class="commentdate"></span></div><div class="commentdata"></div>'
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+ '<button onclick="open_reply($(this),\'' + comment.meta.commentid + '\');return false;">Reply</button>'
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+ '</div></article>');
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setElementText(divComment.find('div.commentdata'), cleartext);
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// Convert URLs to clickable links in comment.
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urls2links(divComment.find('div.commentdata'));
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divComment.find('span.nickname').html('<i>(Anonymous)</i>');
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// Try to get optional nickname:
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try {
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divComment.find('span.nickname').text(zeroDecipher(key, comment.meta.nickname));
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} catch(err) { }
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divComment.find('span.commentdate').text(' ('+(new Date(comment.meta.postdate*1000).toString())+')').attr('title','CommentID: ' + comment.meta.commentid);
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// If an avatar is available, display it.
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if (comment.meta.vizhash) {
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divComment.find('span.nickname').before('<img src="' + comment.meta.vizhash + '" class="vizhash" title="Anonymous avatar (Vizhash of the IP address)" />');
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}
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place.append(divComment);
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}
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$('div#comments').append('<div class="comment"><button onclick="open_reply($(this),\'' + pasteID() + '\');return false;">Add comment</button></div>');
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$('div#discussion').removeClass('hidden');
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}
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}
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/**
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* Open the comment entry when clicking the "Reply" button of a comment.
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* @param object source : element which emitted the event.
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* @param string commentid = identifier of the comment we want to reply to.
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*/
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function open_reply(source, commentid) {
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$('div.reply').remove(); // Remove any other reply area.
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source.after('<div class="reply">'
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+ '<input type="text" id="nickname" title="Optional nickname..." value="Optional nickname..." />'
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+ '<textarea id="replymessage" class="replymessage" cols="80" rows="7"></textarea>'
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+ '<br /><button id="replybutton" onclick="send_comment(\'' + commentid + '\');return false;">Post comment</button>'
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+ '<div id="replystatus"> </div>'
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+ '</div>');
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$('input#nickname').focus(function() {
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if ($(this).val() == $(this).attr('title')) {
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$(this).val('');
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}
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});
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$('textarea#replymessage').focus();
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}
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/**
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* Send a reply in a discussion.
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* @param string parentid : the comment identifier we want to send a reply to.
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*/
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function send_comment(parentid) {
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// Do not send if no data.
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if ($('textarea#replymessage').val().length==0) {
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return;
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}
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showStatus('Sending comment...', spin=true);
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var cipherdata = zeroCipher(pageKey(), $('textarea#replymessage').val());
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var ciphernickname = '';
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var nick=$('input#nickname').val();
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if (nick != '' && nick != 'Optional nickname...') {
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ciphernickname = zeroCipher(pageKey(), nick);
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}
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var data_to_send = { data:cipherdata,
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parentid: parentid,
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pasteid: pasteID(),
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nickname: ciphernickname
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};
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$.post(scriptLocation(), data_to_send, 'json')
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.error(function() {
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showError('Comment could not be sent (serveur error or not responding).');
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})
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.success(function(data) {
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if (data.status == 0) {
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showStatus('Comment posted.');
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location.reload();
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}
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else if (data.status==1) {
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showError('Could not post comment: '+data.message);
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}
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else {
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showError('Could not post comment.');
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}
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});
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}
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/**
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* Send a new paste to server
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*/
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function send_data() {
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// Do not send if no data.
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if ($('textarea#message').val().length == 0) {
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return;
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}
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showStatus('Sending paste...', spin=true);
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var randomkey = sjcl.codec.base64.fromBits(sjcl.random.randomWords(8, 0), 0);
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var cipherdata = zeroCipher(randomkey, $('textarea#message').val());
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var data_to_send = { data: cipherdata,
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expire: $('select#pasteExpiration').val(),
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opendiscussion: $('input#opendiscussion').is(':checked') ? 1 : 0
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};
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$.post(scriptLocation(), data_to_send, 'json')
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.error(function() {
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showError('Data could not be sent (serveur error or not responding).');
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})
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.success(function(data) {
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if (data.status == 0) {
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stateExistingPaste();
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var url = scriptLocation() + "?" + data.id + '#' + randomkey;
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showStatus('');
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$('div#pastelink').html('Your paste is <a href="' + url + '">' + url + '</a>').removeClass('hidden');
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setElementText($('div#cleartext'), $('textarea#message').val());
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setElementText($('pre#prettyprint'), $('textarea#message').val());
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urls2links($('div#cleartext'));
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showStatus('');
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prettyPrint();
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}
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else if (data.status==1) {
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showError('Could not create paste: '+data.message);
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}
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else {
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showError('Could not create paste.');
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}
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});
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}
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/**
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* Put the screen in "New paste" mode.
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*/
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function stateNewPaste() {
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$('button#sendbutton').removeClass('hidden');
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$('button#clonebutton').addClass('hidden');
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$('div#expiration').removeClass('hidden');
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$('div#remainingtime').addClass('hidden');
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$('div#language').addClass('hidden'); // $('#language').removeClass('hidden');
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$('input#password').addClass('hidden'); //$('#password').removeClass('hidden');
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$('div#opendisc').removeClass('hidden');
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$('button#newbutton').removeClass('hidden');
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$('div#pastelink').addClass('hidden');
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$('textarea#message').text('');
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$('textarea#message').removeClass('hidden');
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$('div#cleartext').addClass('hidden');
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$('textarea#message').focus();
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$('div#discussion').addClass('hidden');
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$('div#prettymessage').addClass('hidden');
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}
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/**
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* Put the screen in "Existing paste" mode.
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*/
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function stateExistingPaste() {
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$('button#sendbutton').addClass('hidden');
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// No "clone" for IE<10.
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if ($('div#oldienotice').is(":visible")) {
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$('button#clonebutton').addClass('hidden');
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}
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else {
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$('button#clonebutton').removeClass('hidden');
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}
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$('div#expiration').addClass('hidden');
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$('div#language').addClass('hidden');
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$('input#password').addClass('hidden');
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$('div#opendisc').addClass('hidden');
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$('button#newbutton').removeClass('hidden');
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$('div#pastelink').addClass('hidden');
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$('textarea#message').addClass('hidden');
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$('div#cleartext').addClass('hidden');
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$('div#prettymessage').removeClass('hidden');
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}
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/**
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* Clone the current paste.
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*/
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function clonePaste() {
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stateNewPaste();
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showStatus('');
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$('textarea#message').text($('div#cleartext').text());
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}
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/**
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* Create a new paste.
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*/
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function newPaste() {
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stateNewPaste();
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showStatus('');
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$('textarea#message').text('');
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}
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/**
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* Display an error message
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* (We use the same function for paste and reply to comments)
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*/
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function showError(message) {
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$('div#status').addClass('errorMessage').text(message);
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$('div#replystatus').addClass('errorMessage').text(message);
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}
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/**
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* Display status
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* (We use the same function for paste and reply to comments)
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*
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* @param string message : text to display
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* @param boolean spin (optional) : tell if the "spinning" animation should be displayed.
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*/
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function showStatus(message, spin) {
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$('div#replystatus').removeClass('errorMessage');
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$('div#replystatus').text(message);
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if (!message) {
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$('div#status').html(' ');
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return;
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}
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if (message == '') {
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$('div#status').html(' ');
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return;
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}
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$('div#status').removeClass('errorMessage');
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$('div#status').text(message);
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if (spin) {
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var img = '<img src="img/busy.gif" style="width:16px;height:9px;margin:0px 4px 0px 0px;" />';
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$('div#status').prepend(img);
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$('div#replystatus').prepend(img);
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}
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}
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/**
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* Convert URLs to clickable links.
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* URLs to handle:
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* <code>
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* magnet:?xt.1=urn:sha1:YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5C&xt.2=urn:sha1:TXGCZQTH26NL6OUQAJJPFALHG2LTGBC7
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* http://localhost:8800/zero/?6f09182b8ea51997#WtLEUO5Epj9UHAV9JFs+6pUQZp13TuspAUjnF+iM+dM=
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* http://user:password@localhost:8800/zero/?6f09182b8ea51997#WtLEUO5Epj9UHAV9JFs+6pUQZp13TuspAUjnF+iM+dM=
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* </code>
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*
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* @param object element : a jQuery DOM element.
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* @FIXME: add ppa & apt links.
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*/
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function urls2links(element) {
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var re = /((http|https|ftp):\/\/[\w?=&.\/-;#@~%+-]+(?![\w\s?&.\/;#~%"=-]*>))/ig;
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element.html(element.html().replace(re,'<a href="$1" rel="nofollow">$1</a>'));
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var re = /((magnet):[\w?=&.\/-;#@~%+-]+)/ig;
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element.html(element.html().replace(re,'<a href="$1">$1</a>'));
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}
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/**
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* Return the deciphering key stored in anchor part of the URL
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*/
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function pageKey() {
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var key = window.location.hash.substring(1); // Get key
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// Some stupid web 2.0 services and redirectors add data AFTER the anchor
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// (such as &utm_source=...).
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// We will strip any additional data.
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// First, strip everything after the equal sign (=) which signals end of base64 string.
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i = key.indexOf('='); if (i>-1) { key = key.substring(0,i+1); }
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// If the equal sign was not present, some parameters may remain:
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i = key.indexOf('&'); if (i>-1) { key = key.substring(0,i); }
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// Then add trailing equal sign if it's missing
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if (key.charAt(key.length-1)!=='=') key+='=';
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return key;
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}
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$(function() {
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// hide "no javascript" message
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$('#noscript').hide();
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$('select#pasteExpiration').change(function() {
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if ($(this).val() == 'burn') {
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$('div#opendisc').addClass('buttondisabled');
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$('input#opendiscussion').attr('disabled',true);
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}
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else {
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$('div#opendisc').removeClass('buttondisabled');
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$('input#opendiscussion').removeAttr('disabled');
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}
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});
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// Display an existing paste
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if ($('div#cipherdata').text().length > 1) {
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// Missing decryption key in URL ?
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if (window.location.hash.length == 0) {
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showError('Cannot decrypt paste: Decryption key missing in URL (Did you use a redirector or an URL shortener which strips part of the URL ?)');
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return;
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}
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// List of messages to display
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var messages = jQuery.parseJSON($('div#cipherdata').text());
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// Show proper elements on screen.
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stateExistingPaste();
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displayMessages(pageKey(), messages);
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}
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// Display error message from php code.
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else if ($('div#errormessage').text().length>1) {
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showError($('div#errormessage').text());
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}
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// Create a new paste.
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else {
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newPaste();
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}
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});
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