javascript / expert
Snippet
Object-Oriented Event Target Subclassing with Granular ACL Guards
Creating decoupled modular plugins requires strict access controls over event communication channels. Subclassing the browser-native EventTarget allows implementing token-based authorization rules directly inside the event dispatch hierarchy.
snippet.js
javascript
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class SecurePluginBus extends EventTarget {#authorizedTokens = new Set();registerAuthorizationToken(token) {this.#authorizedTokens.add(token);}dispatchProtectedEvent(event, token) {if (!this.#authorizedTokens.has(token)) {throw new Error('Access denied: Unauthorized event dispatch attempt');}return super.dispatchEvent(event);}}
vue
Breakdown
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class SecurePluginBus extends EventTarget {
Defines a custom event bus class by extending the browser-native EventTarget object.
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#authorizedTokens = new Set();
Creates a private Set instance to store valid security clearance tokens.
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registerAuthorizationToken(token) {
Registers a new authentication token into the authorization registry.
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this.#authorizedTokens.add(token);
Adds the security token to the private access list.
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dispatchProtectedEvent(event, token) {
Defines an access-controlled event dispatching method.
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if (!this.#authorizedTokens.has(token)) {
Evaluates whether the caller holds a registered authorization token.
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throw new Error('Access denied: Unauthorized event dispatch attempt');
Prevents unauthorized event propagation by throwing an access exception.
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return super.dispatchEvent(event);
Delegates execution to native EventTarget dispatching if authorization succeeds.