allow direct path to output file /project/project_id/build/build_id/output/*

this avoids use of the query string ?build=... and so we can match the
url directly with the nginx location directive

services/clsi/app.coffee

@@ -42,6 +42,13 @@ app.param 'project_id', (req, res, next, project_id) ->
 	else
 		next new Error("invalid project id")
 
+app.param 'build_id', (req, res, next, build_id) ->
+	if build_id?.match OutputCacheManager.BUILD_REGEX
+		next()
+	else
+		next new Error("invalid build id #{build_id}")
+
+
 app.post   "/project/:project_id/compile", bodyParser.json(limit: "5mb"), CompileController.compile
 app.delete "/project/:project_id", CompileController.clearCache
 
@@ -65,6 +72,11 @@ staticServer = ForbidSymlinks express.static, Settings.path.compilesDir, setHead
 		res.set("Etag", etag(path, stat))
 	res.set("Content-Type", ContentTypeMapper.map(path))
 
+app.get "/project/:project_id/build/:build_id/output/*", (req, res, next) ->
+	# for specific build get the path from the OutputCacheManager (e.g. .clsi/buildId)
+	req.url = "/#{req.params.project_id}/" + OutputCacheManager.path(req.params.build_id, "/#{req.params[0]}")
+	staticServer(req, res, next)
+
 app.get "/project/:project_id/output/*", (req, res, next) ->
 	if req.query?.build? && req.query.build.match(OutputCacheManager.BUILD_REGEX)
 		# for specific build get the path from the OutputCacheManager (e.g. .clsi/buildId)