add caching to static files

Author: Macaulay, Dane

services/__init__.py

@@ -1,6 +1,10 @@
 from flask import Flask
 
-app = Flask(__name__, static_folder='../build', template_folder='../build')
+BUILD_DIR = 'build'
+build_path = '../{}'.format(BUILD_DIR)
+
+app = Flask(__name__, static_folder=build_path)
+
 import services.static
 import services.views
 

services/static.py

@@ -1,9 +1,20 @@
-from services import app
-from flask import Flask, render_template
+from services import app, BUILD_DIR
+from flask import Flask, Response
+from werkzeug.datastructures import Headers
+
+def load_index_file():
+  index_file_path = '{}/index.html'.format(BUILD_DIR)
+  with open(index_file_path, 'r', encoding='utf-8') as f:
+    index_file = f.read()
+  return index_file
+
+app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 31536000
+index_file = load_index_file()
 
 @app.route('/', methods=['GET'])
 def index():
-  return render_template('index.html')
+  return Response(index_file, mimetype='text/html',
+                  headers=Headers({'Cache-Control': 'max-age=60'}))
 
 @app.route('/<path:path>')
 def static_file(path):