Added getChatHistory and getChatHead (api+code+doc)

doc/api/http_api.md

@@ -292,6 +292,34 @@ returns the text of a pad formatted as HTML
   * `{code: 0, message:"ok", data: {html:"Welcome Text<br>More Text"}}`
   * `{code: 1, message:"padID does not exist", data: null}`
 
+### Chat
+#### getChatHistory(padID, [start, end])
+ * API >= 1.2.7
+
+returns
+
+* a part of the chat history, when `start` and `end` are given
+* the whole chat histroy, when no extra parameters are given
+
+
+*Example returns:*
+
+* `{"code":0,"message":"ok","data":{"messages":[{"text":"foo","userId":"a.foo","time":1359199533759,"userName":"test"},{"text":"bar","userId":"a.foo","time":1359199534622,"userName":"test"}]}}`
+* `{code: 1, message:"start is higher or equal to the current chatHead", data: null}`
+* `{code: 1, message:"padID does not exist", data: null}`
+
+#### getChatHead(padID)
+ * API >= 1.2.7
+
+returns the chatHead (last number of the last chat-message) of the pad
+
+
+*Example returns:*
+
+* `{code: 0, message:"ok", data: {chatHead: 42}}`
+* `{code: 1, message:"padID does not exist", data: null}`
+
+
 ### Pad
 Group pads are normal pads, but with the name schema GROUPID$PADNAME. A security manager controls access of them and its forbidden for normal pads to include a $ in the name. 
 

src/node/db/API.js

@@ -277,6 +277,77 @@ exports.setHTML = function(padID, html, callback)
   });
 }
 
+/******************/
+/**CHAT FUNCTIONS */
+/******************/
+
+/**
+getChatHistory(padId, start, end), returns a part of or the whole chat-history of this pad
+
+Example returns:
+
+{"code":0,"message":"ok","data":{"messages":[{"text":"foo","userId":"a.foo","time":1359199533759,"userName":"test"},
+                                             {"text":"bar","userId":"a.foo","time":1359199534622,"userName":"test"}]}}
+
+{code: 1, message:"start is higher or equal to the current chatHead", data: null}
+
+{code: 1, message:"padID does not exist", data: null}
+*/
+exports.getChatHistory = function(padID, start, end, callback)
+{
+  if(start && end)
+  {
+    if(start < 0)
+    {
+      callback(new customError("start is below zero","apierror"));
+      return;
+    }
+    if(end < 0)
+    {
+      callback(new customError("end is below zero","apierror"));
+      return;
+    }
+    if(start > end)
+    {
+      callback(new customError("start is higher than end","apierror"));
+      return;
+    }
+  }
+  
+  //get the pad
+  getPadSafe(padID, true, function(err, pad)
+  {
+    if(ERR(err, callback)) return;
+    var chatHead = pad.chatHead;
+    
+    // fall back to getting the whole chat-history if a parameter is missing
+    if(!start || !end)
+    {
+	  start = 0;
+	  end = pad.chatHead - 1;
+    }
+    
+    if(start >= chatHead)
+    {
+      callback(new customError("start is higher or equal to the current chatHead","apierror"));
+      return;
+    }
+    if(end >= chatHead)
+    {
+      callback(new customError("end is higher or equal to the current chatHead","apierror"));
+      return;
+    }
+    
+    // the the whole message-log and return it to the client
+    pad.getChatMessages(start, end,
+      function(err, msgs)
+      {
+        if(ERR(err, callback)) return;
+        callback(null, {messages: msgs});
+      });
+  });
+}
+
 /*****************/
 /**PAD FUNCTIONS */
 /*****************/
@@ -567,6 +638,23 @@ exports.checkToken = function(callback)
   callback();
 }
 
+/**
+getChatHead(padID) returns the chatHead (last number of the last chat-message) of the pad
+
+Example returns:
+
+{code: 0, message:"ok", data: {chatHead: 42}}
+{code: 1, message:"padID does not exist", data: null}
+*/
+exports.getChatHead = function(padID, callback)
+{
+  //get the pad
+  getPadSafe(padID, true, function(err, pad)
+  {
+    if(ERR(err, callback)) return;
+    callback(null, {chatHead: pad.chatHead});
+  });
+}
 
 /******************************/
 /** INTERNAL HELPER FUNCTIONS */

src/node/handler/APIHandler.js

@@ -174,6 +174,45 @@ var version =
   , "listAllGroups"             : []
   , "checkToken"                : []
   }
+, "1.2.7":
+  { "createGroup"               : []
+  , "createGroupIfNotExistsFor" : ["groupMapper"]
+  , "deleteGroup"               : ["groupID"]
+  , "listPads"                  : ["groupID"]
+  , "listAllPads"               : []
+  , "createPad"                 : ["padID", "text"]
+  , "createGroupPad"            : ["groupID", "padName", "text"]
+  , "createAuthor"              : ["name"]
+  , "createAuthorIfNotExistsFor": ["authorMapper" , "name"]
+  , "listPadsOfAuthor"          : ["authorID"]
+  , "createSession"             : ["groupID", "authorID", "validUntil"]
+  , "deleteSession"             : ["sessionID"]
+  , "getSessionInfo"            : ["sessionID"]
+  , "listSessionsOfGroup"       : ["groupID"]
+  , "listSessionsOfAuthor"      : ["authorID"]
+  , "getText"                   : ["padID", "rev"]
+  , "setText"                   : ["padID", "text"]
+  , "getHTML"                   : ["padID", "rev"]
+  , "setHTML"                   : ["padID", "html"]
+  , "getRevisionsCount"         : ["padID"]
+  , "getLastEdited"             : ["padID"]
+  , "deletePad"                 : ["padID"]
+  , "getReadOnlyID"             : ["padID"]
+  , "setPublicStatus"           : ["padID", "publicStatus"]
+  , "getPublicStatus"           : ["padID"]
+  , "setPassword"               : ["padID", "password"]
+  , "isPasswordProtected"       : ["padID"]
+  , "listAuthorsOfPad"          : ["padID"]
+  , "padUsersCount"             : ["padID"]
+  , "getAuthorName"             : ["authorID"]
+  , "padUsers"                  : ["padID"]
+  , "sendClientsMessage"        : ["padID", "msg"]
+  , "listAllGroups"             : []
+  , "checkToken"                : []
+  , "getChatHistory"            : ["padID"]
+  , "getChatHistory"            : ["padID", "start", "end"]
+  , "getChatHead"               : ["padID"]
+  }
 };
 
 /**