update create_app and config if the app is behind reverse proxy

Author: jirivrany

config.example.py

@@ -79,6 +79,9 @@ class ProductionConfig(Config):
     DEBUG = False
     DEVEL = False
 
+    # is production behind a reverse proxy?
+    BEHIND_PROXY = True
+
     # Set cookie behavior
     SESSION_COOKIE_SECURE = (True,)
     SESSION_COOKIE_HTTPONLY = (True,)

flowapp/__init__.py

@@ -11,6 +11,8 @@
 from flask_migrate import Migrate
 from flask_session import Session
 from flasgger import Swagger
+from werkzeug.middleware.proxy_fix import ProxyFix
+
 
 from .__about__ import __version__
 from .instance_config import InstanceConfig
@@ -58,6 +60,10 @@ def create_app(config_object=None):
     # Init swagger
     swagger.init_app(app)
 
+    # handle proxy fix
+    if app.config.get("BEHIND_PROXY", False):
+        app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1, x_host=1, x_prefix=1)
+
     from flowapp import models, constants, validators
     from .views.admin import admin
     from .views.rules import rules

requirements.txt

@@ -10,10 +10,8 @@ PyMySQL>=1.0.0
 pytest>=7.0.0
 requests>=2.20.0
 babel>=2.7.0
-mysqlclient>=2.0.0
 email_validator>=1.1
 pika>=1.3.0
-gunicorn>=22.0.0
 loguru
 flasgger
 python-dotenv