toggle project history using setting

services/web/app/coffee/Features/History/HistoryController.coffee

@@ -6,7 +6,8 @@ AuthenticationController = require "../Authentication/AuthenticationController"
 module.exports = HistoryController =
 	proxyToHistoryApi: (req, res, next = (error) ->) ->
 		user_id = AuthenticationController.getLoggedInUserId req
-		url = settings.apis.trackchanges.url + req.url
+		url = HistoryController.buildHistoryServiceUrl() + req.url
+
 		logger.log url: url, "proxying to track-changes api"
 		getReq = request(
 			url: url
@@ -18,3 +19,9 @@ module.exports = HistoryController =
 		getReq.on "error", (error) ->
 			logger.error err: error, "track-changes API error"
 			next(error)
+
+	buildHistoryServiceUrl: () ->
+		if settings.apis.project_history.enabled
+			return settings.apis.project_history.url
+		else
+			return settings.apis.trackchanges.url

services/web/config/settings.defaults.coffee

@@ -104,6 +104,9 @@ module.exports = settings =
 			url : "http://localhost:3005"
 		trackchanges:
 			url : "http://localhost:3015"
+		project_history:
+			enabled: false
+			url : "http://localhost:3054"
 		docstore:
 			url : "http://localhost:3016"
 			pubUrl: "http://localhost:3016"

services/web/test/UnitTests/coffee/History/HistoryControllerTests.coffee

@@ -22,37 +22,60 @@ describe "HistoryController", ->
 			@next = sinon.stub()
 			@settings.apis =
 				trackchanges:
+					enabled: false
 					url: "http://trackchanges.example.com"
+				project_history:
+					url: "http://project_history.example.com"
 			@proxy =
 				events: {}
 				pipe: sinon.stub()
 				on: (event, handler) -> @events[event] = handler
 			@request.returns @proxy
-			@HistoryController.proxyToHistoryApi @req, @res, @next
 
 		describe "successfully", ->
-			it "should get the user id", ->
-				@AuthenticationController.getLoggedInUserId
-					.calledWith(@req)
-					.should.equal true
+			describe "with project history enabled", ->
+				beforeEach ->
+					@settings.apis.project_history.enabled = true
+					@HistoryController.proxyToHistoryApi @req, @res, @next
 
-			it "should call the track changes api", ->
-				@request
-					.calledWith({
-						url: "#{@settings.apis.trackchanges.url}#{@req.url}"
-						method: @req.method
-						headers:
-							"X-User-Id": @user_id
-					})
-					.should.equal true
+				it "should get the user id", ->
+					@AuthenticationController.getLoggedInUserId
+						.calledWith(@req)
+						.should.equal true
 
-			it "should pipe the response to the client", ->
-				@proxy.pipe
-					.calledWith(@res)
-					.should.equal true
+				it "should call the project history api", ->
+					@request
+						.calledWith({
+							url: "#{@settings.apis.project_history.url}#{@req.url}"
+							method: @req.method
+							headers:
+								"X-User-Id": @user_id
+						})
+						.should.equal true
+
+				it "should pipe the response to the client", ->
+					@proxy.pipe
+						.calledWith(@res)
+						.should.equal true
+
+			describe "with project history disabled", ->
+				beforeEach ->
+					@settings.apis.project_history.enabled = false
+					@HistoryController.proxyToHistoryApi @req, @res, @next
+
+				it "should call the track changes api", ->
+					@request
+						.calledWith({
+							url: "#{@settings.apis.trackchanges.url}#{@req.url}"
+							method: @req.method
+							headers:
+								"X-User-Id": @user_id
+						})
+						.should.equal true
 
 		describe "with an error", ->
 			beforeEach ->
+				@HistoryController.proxyToHistoryApi @req, @res, @next
 				@proxy.events["error"].call(@proxy, @error = new Error("oops"))
 
 			it "should pass the error up the call chain", ->