Let API run with default settings in dev mode.

If the configuration file is not found, either at its
default place ($HOME/etc/www/config.json) or wherever
indicated by the DOUGAL_API_CONFIG environment variable,
create a temporary default config and try to run with it.

On the other hand, if we are in production (NODE_ENV == production)
we exit with non-zero in the absence of a real configuration file.

lib/www/server/lib/config.js

@@ -4,26 +4,45 @@ const crypto = require('crypto');
 
 const cfgPath = process.env.DOUGAL_API_CONFIG || (process.env.HOME+"/etc/www/config.json");
 
+let config = {}
+
 try {
 	if (!fs.existsSync(cfgPath)) {
-		console.warn("Configuration file not found", path.resolve(cfgPath));
-		const buffer = Buffer.alloc(64);
-		crypto.randomFillSync(buffer, 0, buffer.length);
-		const secret = buffer.toString("base64");
-		const config = {
-			secret
-		};
-// 		fs.writeFileSync(cfgPath, JSON.stringify(config, null, 4));
-		console.warn("Autogenerated configuration file");
-	}
 
-	const text = fs.readFileSync(cfgPath);
-	if (text) {
-		module.exports = JSON.parse(text);
-		return;
+		if (process.env.NODE_ENV == "production") {
+			console.error("Configuration file not found", path.resolve(cfgPath));
+			process.exit(-1);
+		} else {
+
+			console.warn("Configuration file not found", path.resolve(cfgPath));
+			const buffer = Buffer.alloc(64);
+			crypto.randomFillSync(buffer, 0, buffer.length);
+			const secret = buffer.toString("base64");
+
+			config = {
+				"jwt": {
+					secret
+				},
+				"db": {
+					"user": "postgres",
+					"host": "localhost",
+					"database": "dougal",
+					"port": 5432,
+					"connection_string": "host=localhost port=5432 dbname=dougal user=postgres"
+				}
+			}
+			console.warn("Autogenerated configuration file (NODE_ENV != production)");
+		}
+	} else {
+
+		const text = fs.readFileSync(cfgPath);
+		if (text) {
+			config = JSON.parse(text);
+			return;
+		}
 	}
 } catch (err) {
 	console.error(err);
 }
 
-module.exports = {};
+module.exports = Object.freeze(config);