Optionally use Hashcash for comment verification.

9 files changed, 826 insertions, 25 deletions

diff --git a/COPYING.sha256js b/COPYING.sha256js
new file mode 100644
index 0000000..4296afd
--- /dev/null
+++ b/COPYING.sha256js
@@ -0,0 +1,512 @@
+The code in file static-files/js/sha256.js is copyright 2005-2010 Chris
+Veness and is distributed according to the GNU LGPL, version 2.1.
+
+For more information, see:
+http://www.movable-type.co.uk/scripts/sha256.html
+
+The GNU LGPLv2.1 is reproduced below for your reference.
+
+-----------------------------------------------------------------------
+
+                  GNU LESSER GENERAL PUBLIC LICENSE
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+
+           How to Apply These Terms to Your New Libraries
+
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+possible use to the public, we recommend making it free software that
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+
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+
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+
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+
+  <signature of Ty Coon>, 1 April 1990
+  Ty Coon, President of Vice
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+That's all there is to it!
diff --git a/mulkcms.asd b/mulkcms.asd
index 97520b8..13f0bc6 100644
--- a/mulkcms.asd
+++ b/mulkcms.asd
@@ -9,7 +9,8 @@
   :serial t
   :version "0.0.1"
   :depends-on (:cl-who :cl-json :alexandria :postmodern :split-sequence
-               :cl-ppcre :cl-fad :cxml :closure-html :json-template :cxml-stp)
+               :cl-ppcre :cl-fad :cxml :closure-html :json-template :cxml-stp
+               :ironclad :flexi-streams)
   :components ((:file "package")
                (:file "site")
                (:file "mulkcms")
diff --git a/mulkcms.lisp b/mulkcms.lisp
index 3bef1f5..40bfc92 100644
--- a/mulkcms.lisp
+++ b/mulkcms.lisp
@@ -29,6 +29,11 @@
           (random #x1000000000000)))
 
 
+(defun hashcash-hash-validp (text)
+  (let ((digest (ironclad:digest-sequence 'ironclad:sha256 (flexi-streams:string-to-octets text))))
+    (every #'zerop (subseq digest 0 2))))
+
+
 (defun find-canonical-article-alias (article)
   (query "SELECT alias FROM article_aliases WHERE article = $1 LIMIT 1"
          article
@@ -133,16 +138,18 @@
                                       :submit-button-label "Submit"
                                       :title "Submit a comment"
                                       :notes "<p><strong>Note:</strong>
-                                              This website uses <a
-                                              href=\"http://akismet.com/\">Akismet</a>
+                                              This website uses <span
+                                              class='spam-detection-method'><a
+                                              href=\"http://akismet.com/\">Akismet</a></span>
                                               for spam detection.
                                               E-mail addresses are never
-                                              disclosed to
-                                              anyone (including Akismet)
-                                              other than the site owner.
-                                              Comment format is plain
-                                              text.  Use blank lines to
-                                              separate paragraphs.</p>"
+                                              disclosed to anyone <span
+                                              class='irrelevant-for-hashcash'>(including
+                                              Akismet)</span> other than
+                                              the site owner.  Comment
+                                              format is plain text.  Use
+                                              blank lines to separate
+                                              paragraphs.</p>"
                                       :action (link-to :post-comment :article-id article)))
           :edit-link (link-to :edit :article-id article)
           :edit-button-label "Edit"
@@ -665,12 +672,18 @@
                                            :link ""))
                     (submission-notice nil))
                (when (assoc "post-comment" params :test #'equal)
-                 (let ((name     (cdr (assoc "name"     params :test #'equal)))
-                       (website  (cdr (assoc "website"  params :test #'equal)))
-                       (email    (cdr (assoc "email"    params :test #'equal)))
-                       (body     (cdr (assoc "body"     params :test #'equal)))
-                       (article  (cdr (assoc "article"  params :test #'equal)))
-                       (revision (cdr (assoc "revision" params :test #'equal))))
+                 (let* ((name     (cdr (assoc "name"            params :test #'equal)))
+                        (website  (cdr (assoc "website"         params :test #'equal)))
+                        (email    (cdr (assoc "email"           params :test #'equal)))
+                        (body     (cdr (assoc "body"            params :test #'equal)))
+                        (article  (cdr (assoc "article"         params :test #'equal)))
+                        (revision (cdr (assoc "revision"        params :test #'equal)))
+                        (tkey     (cdr (assoc "transaction-key" params :test #'equal)))
+                        (salt     (cdr (assoc "salt"            params :test #'equal)))
+                        (spam-p   (or (null tkey)
+                                      (null salt)
+                                      (not (hashcash-hash-validp
+                                            (format nil "~A:~A:~A" body tkey salt))))))
                    (with-transaction ()
                      (let ((comment (query "INSERT INTO comments(article, global_id)
                                               VALUES ($1, $2)
@@ -685,22 +698,44 @@
                                            email
                                            website
                                            :single!)))
+                       (when tkey
+                         (query "INSERT INTO used_transaction_keys(key) VALUES ($1)"
+                                tkey
+                                :none))
                        (query "INSERT INTO comment_revisions(comment, content, author, format, status, article_revision, submitter_ip, submitter_user_agent)
-                                 VALUES ($1, $2, $3, 'text', 'pending', $4, $5, $6)"
+                                 VALUES ($1, $2, $3, 'text', $4, $5, $6, $7)"
                               comment
                               body
                               author
+                              (if spam-p
+                                  "pending"
+                                  "spam")
                               revision
                               (hunchentoot:real-remote-addr)
                               (hunchentoot:user-agent)
                               :none)
                        (setq submission-notice
-                             "<p><strong>Note:</strong></p>
-
-                              <p>Your message has been received and put
-                              into the moderation queue.  It is now
-                              waiting for approval by one of the site's
-                              administrators.</p>")))))
+                             (cond
+                               (spam-p "<p><strong>Warning:</strong></p>
+
+                                        <p>Your message could not be
+                                        verified as non-spam.  If
+                                        JavaScript is enabled in your
+                                        browser, it may be broken in
+                                        some way.  In this case, please
+                                        disable JavaScript support and
+                                        try again.  Otherwise, feel free
+                                        to contact one of the site
+                                        administrators, who will be able
+                                        to manually approve your
+                                        comment.</p>")
+                               (t "<p><strong>Note:</strong></p>
+
+                                   <p>Your message has been received and
+                                   classified as non-spam.  It has thus
+                                   been put into the moderation queue and
+                                   is now awaiting approval by one of the
+                                   site's administrators.</p>")))))))
                (expand-page page-template
                             (getf article-params :title)
                             (list* :articles (list article-params)
@@ -711,6 +746,14 @@
 
 
 
+(defun find-transaction-key-handler (path)
+  (when (string= path "RPC/generate-transaction-key")
+    (lambda ()
+      (with-db
+        (setf (hunchentoot:content-type*) "text/plain; charset=utf-8")
+        (format nil "~D" (query "SELECT nextval('transaction_key_seq')" :single!))))))
+
+
 (defun keywordify (thing)
   (intern (string-upcase (format nil "~A" thing)) "KEYWORD"))
 
@@ -730,4 +773,5 @@
        (cond ((assoc "edit"         params :test #'equal) :edit)
              ((assoc "comment-feed" params :test #'equal) :view-comment-feed)
              ((assoc "atom"         params :test #'equal) :view-atom-entry)
-             (t                                           :view)))))
+             (t                                           :view)))
+      (find-transaction-key-handler path)))
diff --git a/schema.sql b/schema.sql
index 6eb4141..1503a84 100644
--- a/schema.sql
+++ b/schema.sql
@@ -166,6 +166,11 @@ CREATE TABLE user_settings(
   FOREIGN KEY ("user") REFERENCES users
 );
 
+CREATE TABLE used_transaction_keys(
+  key BIGINT
+  PRIMARY KEY (key);
+);
+CREATE SEQUENCE transaction_key_seq;
 
 ----
 
diff --git a/static-files/js/comment-submission.js b/static-files/js/comment-submission.js
new file mode 100644
index 0000000..13c3849
--- /dev/null
+++ b/static-files/js/comment-submission.js
@@ -0,0 +1,41 @@
+// Copyright 2011, Matthias Andreas Benkard.
+
+"use strict";
+
+jQuery(function($) {
+  var acceptable_cashhash = function (hash) {
+    return (hash[0] === '0' &&
+            hash[1] === '0' &&
+            hash[2] === '0' &&
+            hash[3] === '0');
+  };
+
+  var form_augmented_p = false;
+  $('.comment-form').submit(function() {
+    var form = $(this);
+    $.ajax({
+      url: "/RPC/generate-transaction-key",
+      dataType: 'json',
+      success: function(tkey) {
+        if (!form_augmented_p) {
+          form.find(':submit').attr("disabled", true);
+          var salt = 0;
+          var text = form.find('textarea');
+          while (!acceptable_cashhash(Sha256.hash(text + ":" + tkey + ":" + salt))) {
+            salt++;
+          }
+          form.prepend('<input type="hidden" name="transaction-key" value="' + tkey + '" />');
+          form.prepend('<input type="hidden" name="salt"            value="' + salt + '" />');
+          form_augmented_p = true;
+          form.submit();
+          return false;
+        } else {
+          return true;
+        }
+      }
+    });
+    return false;
+  });
+  $('.spam-detection-method').text("Hashcash");
+  $('.irrelevant-for-hashcash').text('');
+});
diff --git a/static-files/js/jquery.js b/static-files/js/jquery.js
new file mode 100644
index 0000000..6437874
--- /dev/null
+++ b/static-files/js/jquery.js
@@ -0,0 +1,16 @@
+/*!
+ * jQuery JavaScript Library v1.5.1
+ * http://jquery.com/
+ *
+ * Copyright 2011, John Resig
+ * Dual licensed under the MIT or GPL Version 2 licenses.
+ * http://jquery.org/license
+ *
+ * Includes Sizzle.js
+ * http://sizzlejs.com/
+ * Copyright 2011, The Dojo Foundation
+ * Released under the MIT, BSD, and GPL Licenses.
+ *
+ * Date: Wed Feb 23 13:55:29 2011 -0500
+ */
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\ No newline at end of file
diff --git a/static-files/js/sha256.js b/static-files/js/sha256.js
new file mode 100644
index 0000000..a98498d
--- /dev/null
+++ b/static-files/js/sha256.js
@@ -0,0 +1,174 @@
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
+/*  SHA-256 implementation in JavaScript | (c) Chris Veness 2002-2010 | www.movable-type.co.uk    */
+/*   - see http://csrc.nist.gov/groups/ST/toolkit/secure_hashing.html                             */
+/*         http://csrc.nist.gov/groups/ST/toolkit/examples.html                                   */
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
+
+var Sha256 = {};  // Sha256 namespace
+
+/**
+ * Generates SHA-256 hash of string
+ *
+ * @param {String} msg                String to be hashed
+ * @param {Boolean} [utf8encode=true] Encode msg as UTF-8 before generating hash
+ * @returns {String}                  Hash of msg as hex character string
+ */
+Sha256.hash = function(msg, utf8encode) {
+    utf8encode =  (typeof utf8encode == 'undefined') ? true : utf8encode;
+    
+    // convert string to UTF-8, as SHA only deals with byte-streams
+    if (utf8encode) msg = Utf8.encode(msg);
+    
+    // constants [§4.2.2]
+    var K = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+             0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+             0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+             0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+             0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+             0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+             0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+             0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2];
+    // initial hash value [§5.3.1]
+    var H = [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19];
+
+    // PREPROCESSING 
+ 
+    msg += String.fromCharCode(0x80);  // add trailing '1' bit (+ 0's padding) to string [§5.1.1]
+
+    // convert string msg into 512-bit/16-integer blocks arrays of ints [§5.2.1]
+    var l = msg.length/4 + 2;  // length (in 32-bit integers) of msg + ‘1’ + appended length
+    var N = Math.ceil(l/16);   // number of 16-integer-blocks required to hold 'l' ints
+    var M = new Array(N);
+
+    for (var i=0; i<N; i++) {
+        M[i] = new Array(16);
+        for (var j=0; j<16; j++) {  // encode 4 chars per integer, big-endian encoding
+            M[i][j] = (msg.charCodeAt(i*64+j*4)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16) | 
+                      (msg.charCodeAt(i*64+j*4+2)<<8) | (msg.charCodeAt(i*64+j*4+3));
+        } // note running off the end of msg is ok 'cos bitwise ops on NaN return 0
+    }
+    // add length (in bits) into final pair of 32-bit integers (big-endian) [§5.1.1]
+    // note: most significant word would be (len-1)*8 >>> 32, but since JS converts
+    // bitwise-op args to 32 bits, we need to simulate this by arithmetic operators
+    M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14])
+    M[N-1][15] = ((msg.length-1)*8) & 0xffffffff;
+
+
+    // HASH COMPUTATION [§6.1.2]
+
+    var W = new Array(64); var a, b, c, d, e, f, g, h;
+    for (var i=0; i<N; i++) {
+
+        // 1 - prepare message schedule 'W'
+        for (var t=0;  t<16; t++) W[t] = M[i][t];
+        for (var t=16; t<64; t++) W[t] = (Sha256.sigma1(W[t-2]) + W[t-7] + Sha256.sigma0(W[t-15]) + W[t-16]) & 0xffffffff;
+
+        // 2 - initialise working variables a, b, c, d, e, f, g, h with previous hash value
+        a = H[0]; b = H[1]; c = H[2]; d = H[3]; e = H[4]; f = H[5]; g = H[6]; h = H[7];
+
+        // 3 - main loop (note 'addition modulo 2^32')
+        for (var t=0; t<64; t++) {
+            var T1 = h + Sha256.Sigma1(e) + Sha256.Ch(e, f, g) + K[t] + W[t];
+            var T2 = Sha256.Sigma0(a) + Sha256.Maj(a, b, c);
+            h = g;
+            g = f;
+            f = e;
+            e = (d + T1) & 0xffffffff;
+            d = c;
+            c = b;
+            b = a;
+            a = (T1 + T2) & 0xffffffff;
+        }
+         // 4 - compute the new intermediate hash value (note 'addition modulo 2^32')
+        H[0] = (H[0]+a) & 0xffffffff;
+        H[1] = (H[1]+b) & 0xffffffff; 
+        H[2] = (H[2]+c) & 0xffffffff; 
+        H[3] = (H[3]+d) & 0xffffffff; 
+        H[4] = (H[4]+e) & 0xffffffff;
+        H[5] = (H[5]+f) & 0xffffffff;
+        H[6] = (H[6]+g) & 0xffffffff; 
+        H[7] = (H[7]+h) & 0xffffffff; 
+    }
+
+    return Sha256.toHexStr(H[0]) + Sha256.toHexStr(H[1]) + Sha256.toHexStr(H[2]) + Sha256.toHexStr(H[3]) + 
+           Sha256.toHexStr(H[4]) + Sha256.toHexStr(H[5]) + Sha256.toHexStr(H[6]) + Sha256.toHexStr(H[7]);
+}
+
+Sha256.ROTR = function(n, x) { return (x >>> n) | (x << (32-n)); }
+Sha256.Sigma0 = function(x) { return Sha256.ROTR(2,  x) ^ Sha256.ROTR(13, x) ^ Sha256.ROTR(22, x); }
+Sha256.Sigma1 = function(x) { return Sha256.ROTR(6,  x) ^ Sha256.ROTR(11, x) ^ Sha256.ROTR(25, x); }
+Sha256.sigma0 = function(x) { return Sha256.ROTR(7,  x) ^ Sha256.ROTR(18, x) ^ (x>>>3);  }
+Sha256.sigma1 = function(x) { return Sha256.ROTR(17, x) ^ Sha256.ROTR(19, x) ^ (x>>>10); }
+Sha256.Ch = function(x, y, z)  { return (x & y) ^ (~x & z); }
+Sha256.Maj = function(x, y, z) { return (x & y) ^ (x & z) ^ (y & z); }
+
+//
+// hexadecimal representation of a number 
+//   (note toString(16) is implementation-dependant, and  
+//   in IE returns signed numbers when used on full words)
+//
+Sha256.toHexStr = function(n) {
+  var s="", v;
+  for (var i=7; i>=0; i--) { v = (n>>>(i*4)) & 0xf; s += v.toString(16); }
+  return s;
+}
+
+
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
+/*  Utf8 class: encode / decode between multi-byte Unicode characters and UTF-8 multiple          */
+/*              single-byte character encoding (c) Chris Veness 2002-2010                         */
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
+
+var Utf8 = {};  // Utf8 namespace
+
+/**
+ * Encode multi-byte Unicode string into utf-8 multiple single-byte characters 
+ * (BMP / basic multilingual plane only)
+ *
+ * Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars
+ *
+ * @param {String} strUni Unicode string to be encoded as UTF-8
+ * @returns {String} encoded string
+ */
+Utf8.encode = function(strUni) {
+  // use regular expressions & String.replace callback function for better efficiency 
+  // than procedural approaches
+  var strUtf = strUni.replace(
+      /[\u0080-\u07ff]/g,  // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz
+      function(c) { 
+        var cc = c.charCodeAt(0);
+        return String.fromCharCode(0xc0 | cc>>6, 0x80 | cc&0x3f); }
+    );
+  strUtf = strUtf.replace(
+      /[\u0800-\uffff]/g,  // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz
+      function(c) { 
+        var cc = c.charCodeAt(0); 
+        return String.fromCharCode(0xe0 | cc>>12, 0x80 | cc>>6&0x3F, 0x80 | cc&0x3f); }
+    );
+  return strUtf;
+}
+
+/**
+ * Decode utf-8 encoded string back into multi-byte Unicode characters
+ *
+ * @param {String} strUtf UTF-8 string to be decoded back to Unicode
+ * @returns {String} decoded string
+ */
+Utf8.decode = function(strUtf) {
+  // note: decode 3-byte chars first as decoded 2-byte strings could appear to be 3-byte char!
+  var strUni = strUtf.replace(
+      /[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g,  // 3-byte chars
+      function(c) {  // (note parentheses for precence)
+        var cc = ((c.charCodeAt(0)&0x0f)<<12) | ((c.charCodeAt(1)&0x3f)<<6) | ( c.charCodeAt(2)&0x3f); 
+        return String.fromCharCode(cc); }
+    );
+  strUni = strUni.replace(
+      /[\u00c0-\u00df][\u0080-\u00bf]/g,                 // 2-byte chars
+      function(c) {  // (note parentheses for precence)
+        var cc = (c.charCodeAt(0)&0x1f)<<6 | c.charCodeAt(1)&0x3f;
+        return String.fromCharCode(cc); }
+    );
+  return strUni;
+}
+
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
diff --git a/templates/article.html b/templates/article.html
index c4ebff4..bd8b10a 100644
--- a/templates/article.html
+++ b/templates/article.html
@@ -59,7 +59,8 @@
     <h2>{title}</h2>
     {notes}
     <form action="{action|html-attr-value}" accept-charset="UTF-8"
-          enctype="application/x-www-form-urlencoded" method="post">
+          enctype="application/x-www-form-urlencoded" method="post"
+          class="comment-form">
       <div style="display: none">
         <input name="article" type="hidden" value="{article-id|html-attr-value}" />
         <input name="revision" type="hidden" value="{revision|html-attr-value}" />
@@ -88,7 +89,11 @@
           </div>
         </div>
       </div>
-      <div><input type="submit" value="{submit-button-label|html-attr-value}"></div>
+      <div>
+        <input type="submit"
+               value="{submit-button-label|html-attr-value}"
+               class="comment-submit-button" />
+      </div>
     </form>
   {.end}
 
diff --git a/templates/journal_page.html b/templates/journal_page.html
index 2e0ed61..f793ff2 100644
--- a/templates/journal_page.html
+++ b/templates/journal_page.html
@@ -4,6 +4,9 @@
   <link href="/journal/prettify/prettify.css" rel="stylesheet" type="text/css" />
   <script type="text/javascript" src="/journal/prettify/prettify.js"></script>
   <script type="text/javascript" src="/journal/prettify/lang-lisp.js"></script>
+  <script type="text/javascript" src="/js/jquery.js"></script>
+  <script type="text/javascript" src="/js/sha256.js"></script>
+  <script type="text/javascript" src="/js/comment-submission.js"></script>
 {.end}
 
 {.section body}