add passenger_wsgi.py for alternate deployment

app/__init__.py

@@ -2,14 +2,21 @@
 from datetime import datetime, timezone
 from flask import Flask, abort, jsonify, session, redirect, request
 from flask_sqlalchemy import SQLAlchemy
+from dotenv import load_dotenv
+load_dotenv()
 
 flaskApp = Flask(__name__)
 flaskApp.config.update(
     SQLALCHEMY_DATABASE_URI=os.getenv('SQLALCHEMY_DATABASE_URI'),
     SQLALCHEMY_TRACK_MODIFICATIONS=os.getenv('SQLALCHEMY_TRACK_MODIFICATIONS'),
     SECRET_KEY=os.getenv('SECRET_KEY')
 )
-ADMIN_USERS = os.getenv('ADMIN_USERS').split(',')
+
+try:
+    ADMIN_USERS = os.getenv('ADMIN_USERS').split(',')
+except:
+    ADMIN_USERS = []
+
 DEBUG_MODE = os.getenv('DEBUG')
 REACT_DOMAIN = os.getenv('REACT_JS_DOMAIN')
 MINUTES_EXPIRE = int(os.getenv('SESSION_EXPIRE_MINUTES'))

passenger_wsgi.py

@@ -0,0 +1,27 @@
+import sys, os
+
+PYTHON_DIRECTORY = ''
+APP_DIRECTORY = ''
+
+# dotenv is not available until the venv Python (with installed packages) replaces the running Python process (via `os.execl` below)
+try:
+    with open('.env') as f:
+        for line in f:
+            if line.startswith('PYTHON_DIRECTORY'):
+                PYTHON_DIRECTORY = line.strip().split('=', 1)[1]
+            elif line.startswith('APP_DIRECTORY'):
+                APP_DIRECTORY = line.strip().split('=', 1)[1]
+            else:
+                continue
+except:
+    pass
+
+INTERP = os.path.expanduser(PYTHON_DIRECTORY)
+
+# INTERP is present twice so that the new Python interpreter knows the actual executable path
+if sys.executable != INTERP: os.execl(INTERP, INTERP, *sys.argv)
+
+cwd = os.getcwd()
+sys.path.insert(0, cwd + APP_DIRECTORY)  # You must add your project here
+
+from app import flaskApp as application