refactor: override config from env

Closes varia/octomode#8

README.md

@@ -83,6 +83,21 @@ You can clone this repository to run octomode on your own computer or server.
 
 `make setup` (sets up a virtual environment and install the requirements, you only need to do this once)
 
+Then you can configure your environment:
+
+- **OCTOMODE_PORTNUMBER**: optional, default: `5001`
+- **OCTOMODE_PAD_URL**: optional, default: `https://pad.vvvvvvaria.org/`
+- **OCTOMODE_PAD_API_URL**: optional, default: `https://pad.vvvvvvaria.org/api/1.2.15/`
+- **OCTOMODE_PAD_API_KEY**: required, **no default**
+
+You must provide a value for `OCTOMODE_PAD_API_KEY`.
+
+You can do this by passing the values on the command-line before running octomode:
+
+```
+export OCTOMODE_PAD_API_KEY=...
+```
+
 `make run` (runs the Flask application)
 
 Open the application at <http://localhost:5001>.

config.py

@@ -1,6 +0,0 @@
-class Config(object):
-	APPLICATION_ROOT = '/'
-	PORTNUMBER = 5001
-	PAD_URL = 'https://pad.vvvvvvaria.org/' # with a slash in the end!
-	PAD_API_URL = 'https://pad.vvvvvvaria.org/api/1.2.15/'
-	PAD_API_KEY = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

octomode.py

@@ -14,8 +14,20 @@ import pypandoc
 # To read the Markdown metadat
 import markdown
 
+class Config(object):
+    APPLICATION_ROOT = '/'
+    PORTNUMBER = int(os.environ.get('OCTOMODE_PORTNUMBER', 5001))
+    PAD_URL = os.environ.get('OCTOMODE_PAD_URL', 'https://pad.vvvvvvaria.org/' )
+    PAD_API_URL = os.environ.get('OCTOMODE_PAD_API_URL', 'https://pad.vvvvvvaria.org/api/1.2.15/')
+    PAD_API_KEY = os.environ.get('OCTOMODE_PAD_API_KEY', '')
+
 APP = Flask(__name__)
-APP.config.from_object("config.Config")
+APP.config.from_object(Config)
+
+if APP.config.get('PAD_API_KEY', '') == '':
+    print("error: you must provide a value for OCTOMODE_PAD_API_KEY")
+    print("error: e.g. export OCTOMODE_PAD_API_KEY=...")
+    exit(1)
 
 # ---