Add logout method to auth provider API

src/vs/vscode.proposed.d.ts

@@ -128,6 +128,14 @@ declare module 'vscode' {
 		*/
 		export function login(providerId: string, scopes: string[]): Thenable<AuthenticationSession>;
 
+		/**
+		* Logout of a specific session.
+		* @param providerId The id of the provider to use
+		* @param sessionId The session id to remove
+		* provider
+		*/
+		export function logout(providerId: string, sessionId: string): Thenable<void>;
+
 		/**
 		* An [event](#Event) which fires when the array of sessions has changed, or data
 		* within a session has changed for a provider. Fires with the ids of the providers

src/vs/workbench/api/common/extHost.api.impl.ts

@@ -202,6 +202,9 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			login(providerId: string, scopes: string[]): Thenable<vscode.AuthenticationSession> {
 				return extHostAuthentication.login(extension, providerId, scopes);
 			},
+			logout(providerId: string, sessionId: string): Thenable<void> {
+				return extHostAuthentication.logout(providerId, sessionId);
+			},
 			get onDidChangeSessions(): Event<{ [providerId: string]: vscode.AuthenticationSessionsChangeEvent }> {
 				return extHostAuthentication.onDidChangeSessions;
 			},

src/vs/workbench/api/common/extHostAuthentication.ts

@@ -102,6 +102,15 @@ export class ExtHostAuthentication implements ExtHostAuthenticationShape {
 		};
 	}
 
+	async logout(providerId: string, sessionId: string): Promise<void> {
+		const provider = this._authenticationProviders.get(providerId);
+		if (!provider) {
+			throw new Error(`No authentication provider with id '${providerId}' is currently registered.`);
+		}
+
+		return provider.logout(sessionId);
+	}
+
 	registerAuthenticationProvider(provider: vscode.AuthenticationProvider): vscode.Disposable {
 		if (this._authenticationProviders.get(provider.id)) {
 			throw new Error(`An authentication provider with id '${provider.id}' is already registered.`);