Add config validator (#125)

* Add config validator

* Add docs

changelog.d/125.feature

@@ -0,0 +1 @@
+Add new script `validate-config` which check your config file for simple errors.

docs/setup.md

@@ -52,6 +52,8 @@ Copy the `config.sample.yml` to a new file `config.yml`. The sample config is al
 
 You should read and fill this in as the bridge will not start without a complete config.
 
+You may validate your config without starting the service by running `yarn validate-config`.
+
 Copy `registration.sample.yml` into `registration.yml` and fill in:
 - At a minimum, you will need to replace the `as_token` and `hs_token` and change the domain part of the namespaces.
 

package.json

@@ -30,7 +30,8 @@
     "lint": "yarn run lint:js && yarn run lint:rs",
     "lint:js": "eslint -c .eslintrc.js src/**/*.ts",
     "lint:rs": "cargo fmt --all -- --check",
-    "generate-default-config": "ts-node src/Config/Defaults.ts --config > config.sample.yml"
+    "generate-default-config": "ts-node src/Config/Defaults.ts --config > config.sample.yml",
+    "validate-config": "ts-node src/Config/Config.ts"
   },
   "dependencies": {
     "@alloc/quick-lru": "^5.2.0",

src/Config/Config.ts

@@ -272,3 +272,17 @@ export async function parseRegistrationFile(filename: string) {
     const file = await fs.readFile(filename, "utf-8");
     return YAML.parse(file) as IAppserviceRegistration;
 }
+
+
+// Can be called directly
+if (require.main === module) {
+    BridgeConfig.parseConfig(process.argv[2] || "config.yml", process.env).then(() => {
+        // eslint-disable-next-line no-console
+        console.log('Config successfully validated.');
+        process.exit(0);
+    }).catch(ex => {
+        // eslint-disable-next-line no-console
+        console.error('Error in config:', ex);
+        process.exit(1);
+    });
+}