1 files changed, 101 insertions, 0 deletions

diff --git a/trunk/etherpad/src/static/js/pad_cookie.js b/trunk/etherpad/src/static/js/pad_cookie.js
new file mode 100644
index 0000000..3cc31ed
--- /dev/null
+++ b/trunk/etherpad/src/static/js/pad_cookie.js
@@ -0,0 +1,101 @@
+/**
+ * Copyright 2009 Google Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+var padcookie = (function(){
+  function getRawCookie() {
+    // returns null if can't get cookie text
+    if (! document.cookie) {
+      return null;
+    }
+    // look for (start of string OR semicolon) followed by whitespace followed by prefs=(something);
+    var regexResult = document.cookie.match(/(?:^|;)\s*prefs=([^;]*)(?:;|$)/);
+    if ((! regexResult) || (! regexResult[1])) {
+      return null;
+    }
+    return regexResult[1];
+  }
+  function setRawCookie(safeText) {
+    var expiresDate = new Date();
+    expiresDate.setFullYear(3000);
+    document.cookie = ('prefs='+safeText+';expires='+expiresDate.toGMTString());
+  }
+  function parseCookie(text) {
+    // returns null if can't parse cookie.
+
+    try {
+      var cookieData = JSON.parse(unescape(text));
+      return cookieData;
+    }
+    catch (e) {
+      return null;
+    }
+  }
+  function stringifyCookie(data) {
+    return escape(JSON.stringify(data));
+  }
+  function saveCookie() {
+    if (! inited) {
+      return;
+    }
+    setRawCookie(stringifyCookie(cookieData));
+
+    if (pad.getIsProPad() && (! getRawCookie()) && (! alreadyWarnedAboutNoCookies)) {
+      alert("Warning: it appears that your browser does not have cookies enabled."+
+	    " EtherPad uses cookies to keep track of unique users for the purpose"+
+	    " of putting a quota on the number of active users.  Using EtherPad without "+
+	    " cookies may fill up your server's user quota faster than expected.");
+      alreadyWarnedAboutNoCookies = true;
+    }
+  }
+
+  var wasNoCookie = true;
+  var cookieData = {};
+  var alreadyWarnedAboutNoCookies = false;
+  var inited = false;
+
+  var self = {
+    init: function(prefsToSet) {
+      var rawCookie = getRawCookie();
+      if (rawCookie) {
+        var cookieObj = parseCookie(rawCookie);
+        if (cookieObj) {
+          wasNoCookie = false; // there was a cookie
+          delete cookieObj.userId;
+          delete cookieObj.name;
+          delete cookieObj.colorId;
+          cookieData = cookieObj;
+        }
+      }
+
+      for(var k in prefsToSet) {
+        cookieData[k] = prefsToSet[k];
+      }
+
+      inited = true;
+      saveCookie();
+    },
+    wasNoCookie: function() { return wasNoCookie; },
+    getPref: function(prefName) {
+      return cookieData[prefName];
+    },
+    setPref: function(prefName, value) {
+      cookieData[prefName] = value;
+      saveCookie();
+    }
+  };
+  return self;
+}());
\ No newline at end of file