Add a saveRevision API function

Calling saveRevision create an author which name is "API"

doc/api/http_api.md

@@ -420,6 +420,15 @@ returns the list of saved revisions of this pad
   * `{code: 0, message:"ok", data: {savedRevisions: [2, 42, 1337]}}`
   * `{code: 1, message:"padID does not exist", data: null}`
 
+#### saveRevision(padID [, rev])
+ * API >= 1.2.11
+
+saves a revision
+
+*Example returns:*
+  * `{code: 0, message:"ok", data: null}`
+  * `{code: 1, message:"padID does not exist", data: null}`
+
 #### padUsersCount(padID)
  * API >= 1
 

src/node/db/API.js

@@ -555,6 +555,79 @@ exports.listSavedRevisions = function(padID, callback)
   });
 }
 
+/**
+saveRevision(padID) returns the list of saved revisions of this pad
+
+Example returns:
+
+{code: 0, message:"ok", data: null}
+{code: 1, message:"padID does not exist", data: null}
+*/
+exports.saveRevision = function(padID, rev, callback)
+{
+  //check if rev is set
+  if(typeof rev == "function")
+  {
+    callback = rev;
+    rev = undefined;
+  }
+
+  //check if rev is a number
+  if(rev !== undefined && typeof rev != "number")
+  {
+    //try to parse the number
+    if(!isNaN(parseInt(rev)))
+    {
+      rev = parseInt(rev);
+    }
+    else
+    {
+      callback(new customError("rev is not a number", "apierror"));
+      return;
+    }
+  }
+
+  //ensure this is not a negativ number
+  if(rev !== undefined && rev < 0)
+  {
+    callback(new customError("rev is a negativ number","apierror"));
+    return;
+  }
+
+  //ensure this is not a float value
+  if(rev !== undefined && !is_int(rev))
+  {
+    callback(new customError("rev is a float value","apierror"));
+    return;
+  }
+
+  //get the pad
+  getPadSafe(padID, true, function(err, pad)
+  {
+    if(ERR(err, callback)) return;
+
+    //the client asked for a special revision
+    if(rev !== undefined)
+    {
+      //check if this is a valid revision
+      if(rev > pad.getHeadRevisionNumber())
+      {
+        callback(new customError("rev is higher than the head revision of the pad","apierror"));
+        return;
+      }
+    } else {
+      rev = pad.getHeadRevisionNumber();
+    }
+
+    authorManager.createAuthor('API', function(err, author) {
+      if(ERR(err, callback)) return;
+
+      pad.addSavedRevision(rev, author.authorID, 'Saved through API call');
+      callback();
+    });
+  });
+}
+
 /**
 getLastEdited(padID) returns the timestamp of the last revision of the pad
 

src/node/handler/APIHandler.js

@@ -370,6 +370,7 @@ var version =
   , "getRevisionsCount"         : ["padID"]
   , "getSavedRevisionsCount"    : ["padID"]
   , "listSavedRevisions"        : ["padID"]
+  , "saveRevision"              : ["padID", "rev"]
   , "getRevisionChangeset"      : ["padID", "rev"]
   , "getLastEdited"             : ["padID"]
   , "deletePad"                 : ["padID"]