Initial open source commit

app/coffee/UrlFetcher.coffee

@@ -0,0 +1,23 @@
+request = require("request").defaults(jar: false)
+fs = require("fs")
+
+module.exports = UrlFetcher =
+	pipeUrlToFile: (url, filePath, _callback = (error) ->) ->
+		callbackOnce = (error) ->
+			_callback(error)
+			_callback = () ->
+
+		urlStream = request.get(url)
+		fileStream = fs.createWriteStream(filePath)
+
+		urlStream.on "response", (res) ->
+			if res.statusCode >= 200 and res.statusCode < 300
+				urlStream.pipe(fileStream)
+			else
+				callbackOnce(new Error("URL returned non-success status code: #{res.statusCode}"))
+
+		urlStream.on "error", (error) ->
+			callbackOnce(error or new Error("Something went wrong downloading the URL"))
+
+		urlStream.on "end", () ->
+			callbackOnce()