Fail to start when widgets are configured without a listener (#298)

* Add note about listener configuration in widgets.md

* Add errors to check when widgets are not fully configured

* changelog

* Include widget listener in default config

changelog.d/298.misc

@@ -0,0 +1 @@
+Fail to start when widgets are configured but no "widgets" listener is configured.

config.sample.yml

@@ -155,4 +155,8 @@ listeners:
     resources:
       - metrics
       - provisioning
+  - port: 9002
+    bindAddress: 0.0.0.0
+    resources:
+      - widgets
 

docs/advanced/widgets.md

@@ -60,6 +60,17 @@ Unless you know what you are doing, it is recommended to not include this key. T
 `branding` allows you to change the strings used for various bits of widget UI. At the moment you can:
  - Set `widgetTitle` to change the title of the widget that is created.
 
+In addition to setting up the widgets config, you must bind a listener for the widgets resource in your `listeners` config.
+
+```yaml
+listeners:
+  - port: 5069
+    bindAddress: 0.0.0.0
+    resources:
+      - widgets
+```
+
+See the [setup page](../setup#listeners-configuration) for more information on listeners.
 
 ### API
 

src/Config/Config.ts

@@ -7,6 +7,7 @@ import { BridgeConfigListener, ResourceTypeArray } from "../ListenerService";
 import { GitHubRepoConnectionOptions } from "../Connections/GithubRepo";
 import { BridgeConfigActorPermission, BridgePermissions } from "../libRs";
 import LogWrapper from "../LogWrapper";
+import { ConfigError } from "../errors";
 
 const log = new LogWrapper("Config");
 
@@ -187,7 +188,7 @@ export class BridgeConfigGenericWebhooks {
     public readonly waitForComplete?: boolean;
     constructor(yaml: BridgeGenericWebhooksConfigYAML) {
         if (typeof yaml.urlPrefix !== "string") {
-            throw Error('urlPrefix is not defined or not a string');
+            throw new ConfigError("generic.urlPrefix", "is not defined or not a string");
         }
         this.enabled = yaml.enabled || false;
         this.urlPrefix = yaml.urlPrefix;
@@ -235,10 +236,10 @@ export class BridgeWidgetConfig {
         this.disallowedIpRanges = yaml.disallowedIpRanges;
         this.roomSetupWidget = yaml.roomSetupWidget;
         if (yaml.disallowedIpRanges !== undefined && (!Array.isArray(yaml.disallowedIpRanges) || !yaml.disallowedIpRanges.every(s => typeof s === "string"))) {
-            throw Error('disallowedIpRanges must be a string array');
+            throw new ConfigError("widgets.disallowedIpRanges", "must be a string array");
         }
         if (typeof yaml.publicUrl !== "string") {
-            throw Error('publicUrl is not defined or not a string');
+            throw new ConfigError("widgets.publicUrl", "is not defined or not a string");
         }
         this.publicUrl = yaml.publicUrl;
         this.branding = yaml.branding || {
@@ -389,7 +390,7 @@ export class BridgeConfig {
         // To allow DEBUG as well as debug
         this.logging.level = this.logging.level.toLowerCase() as "debug"|"info"|"warn"|"error"|"trace";
         if (!ValidLogLevelStrings.includes(this.logging.level)) {
-            throw Error(`'logging.level' is not valid. Must be one of ${ValidLogLevelStrings.join(', ')}`)
+            throw new ConfigError("logging.level", `Logging level is not valid. Must be one of ${ValidLogLevelStrings.join(', ')}`)
         }
 
         this.permissions = configData.permissions || [{
@@ -461,6 +462,11 @@ export class BridgeConfig {
             });
             log.warn("The `widgets` configuration still specifies a port/bindAddress. This should be moved to the `listeners` config.");
         }
+
+        const hasWidgetListener = !!this.listeners.find(l => l.resources.includes('widgets'));
+        if (this.widgets && !hasWidgetListener) {
+            throw new ConfigError(`listeners`, "You have enabled the widgets feature, but not included a widgets listener.");
+        }
     }
 
     public async prefillMembershipCache(client: MatrixClient) {

src/Config/Defaults.ts

@@ -120,6 +120,11 @@ export const DefaultConfig = new BridgeConfig({
             port: 9001,
             bindAddress: '127.0.0.1',
             resources: ['metrics', 'provisioning'],
+        },
+        {
+            port: 9002,
+            bindAddress: '0.0.0.0',
+            resources: ['widgets'],
         }
     ]
 }, {});

src/errors.ts

@@ -9,3 +9,9 @@ export class NotLoggedInError extends CommandError {
         super("User is not logged in", "You are not logged in");
     }
 }
+
+export class ConfigError extends Error {
+    constructor(public readonly configPath: string, public readonly msg?: string) {
+        super(`There was an error in the config (${configPath}): ${msg}`);
+    }
+}