Move the `handleError` function into the `LinkedFilesController`

app/coffee/Features/LinkedFiles/LinkedFilesController.coffee

@@ -4,8 +4,19 @@ ProjectLocator = require '../Project/ProjectLocator'
 Settings = require 'settings-sharelatex'
 logger = require 'logger-sharelatex'
 _ = require 'underscore'
-LinkedFilesErrors = require './LinkedFilesErrors'
 LinkedFilesHandler = require './LinkedFilesHandler'
+{
+
+	UrlFetchFailedError,
+	InvalidUrlError,
+	OutputFileFetchFailedError,
+	AccessDeniedError,
+	BadEntityTypeError,
+	BadDataError,
+	ProjectNotFoundError,
+	V1ProjectNotFoundError,
+	SourceFileNotFoundError,
+} = require './LinkedFilesErrors'
 
 
 module.exports = LinkedFilesController = {
@@ -41,7 +52,7 @@ module.exports = LinkedFilesController = {
 			parent_folder_id,
 			user_id,
 			(err, newFileId) ->
-				return LinkedFilesErrors.handleError(err, req, res, next) if err?
+				return LinkedFilesController.handleError(err, req, res, next) if err?
 				res.json(new_file_id: newFileId)
 
 	refreshLinkedFile: (req, res, next) ->
@@ -68,7 +79,44 @@ module.exports = LinkedFilesController = {
 				parent_folder_id,
 				user_id,
 				(err, newFileId) ->
-					return LinkedFilesErrors.handleError(err, req, res, next) if err?
+					return LinkedFilesController.handleError(err, req, res, next) if err?
 					res.json(new_file_id: newFileId)
 
+	handleError: (error, req, res, next) ->
+		if error instanceof BadDataError
+			res.status(400).send("The submitted data is not valid")
+
+		else if error instanceof AccessDeniedError
+			res.status(403).send("You do not have access to this project")
+
+		else if error instanceof BadDataError
+			res.status(400).send("The submitted data is not valid")
+
+		else if error instanceof BadEntityTypeError
+			res.status(400).send("The file is the wrong type")
+
+		else if error instanceof SourceFileNotFoundError
+			res.status(404).send("Source file not found")
+
+		else if error instanceof ProjectNotFoundError
+			res.status(404).send("Project not found")
+
+		else if error instanceof V1ProjectNotFoundError
+			res.status(409).send("Sorry, the source project is not yet imported to Overleaf v2. Please import it to Overleaf v2 to refresh this file")
+
+		else if error instanceof OutputFileFetchFailedError
+			res.status(404).send("Could not get output file")
+
+		else if error instanceof UrlFetchFailedError
+			res.status(422).send(
+				"Your URL could not be reached (#{error.statusCode} status code). Please check it and try again."
+			)
+
+		else if error instanceof InvalidUrlError
+			res.status(422).send(
+				"Your URL is not valid. Please check it and try again."
+			)
+
+		else
+			next(error)
 }

app/coffee/Features/LinkedFiles/LinkedFilesErrors.coffee

@@ -81,42 +81,4 @@ module.exports = {
 	ProjectNotFoundError,
 	V1ProjectNotFoundError,
 	SourceFileNotFoundError,
-
-	handleError: (error, req, res, next) ->
-		if error instanceof BadDataError
-			res.status(400).send("The submitted data is not valid")
-
-		else if error instanceof AccessDeniedError
-			res.status(403).send("You do not have access to this project")
-
-		else if error instanceof BadDataError
-			res.status(400).send("The submitted data is not valid")
-
-		else if error instanceof BadEntityTypeError
-			res.status(400).send("The file is the wrong type")
-
-		else if error instanceof SourceFileNotFoundError
-			res.status(404).send("Source file not found")
-
-		else if error instanceof ProjectNotFoundError
-			res.status(404).send("Project not found")
-
-		else if error instanceof V1ProjectNotFoundError
-			res.status(409).send("Sorry, the source project is not yet imported to Overleaf v2. Please import it to Overleaf v2 to refresh this file")
-
-		else if error instanceof OutputFileFetchFailedError
-			res.status(404).send("Could not get output file")
-
-		else if error instanceof UrlFetchFailedError
-			res.status(422).send(
-				"Your URL could not be reached (#{error.statusCode} status code). Please check it and try again."
-			)
-
-		else if error instanceof InvalidUrlError
-			res.status(422).send(
-				"Your URL is not valid. Please check it and try again."
-			)
-
-		else
-			next(error)
 }