🐛 Adding credential test for Zendesk API Token

packages/nodes-base/nodes/Zendesk/Zendesk.node.ts

@@ -1,8 +1,14 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
 import {
 	IExecuteFunctions,
 } from 'n8n-core';
 
 import {
+	ICredentialsDecrypted,
+	ICredentialTestFunctions,
 	IDataObject,
 	ILoadOptionsFunctions,
 	INodeExecutionData,
@@ -10,6 +16,7 @@ import {
 	INodeType,
 	INodeTypeDescription,
 	NodeApiError,
+	NodeCredentialTestResult,
 	NodeOperationError,
 } from 'n8n-workflow';
 
@@ -70,6 +77,7 @@ export class Zendesk implements INodeType {
 						],
 					},
 				},
+				testedBy: 'zendeskSoftwareApiTest',
 			},
 			{
 				name: 'zendeskOAuth2Api',
@@ -146,6 +154,42 @@ export class Zendesk implements INodeType {
 	};
 
 	methods = {
+		credentialTest: {
+			async zendeskSoftwareApiTest(this: ICredentialTestFunctions, credential: ICredentialsDecrypted): Promise<NodeCredentialTestResult> {
+				const credentials = credential.data;
+				const subdomain = credentials!.subdomain;
+				const email = credentials!.email;
+				const apiToken = credentials!.apiToken;
+
+				const base64Key =  Buffer.from(`${email}/token:${apiToken}`).toString('base64');
+				const options: OptionsWithUri = {
+					headers: {
+						'Content-Type': 'application/json',
+						'Authorization': `Basic ${base64Key}`,
+					},
+					method: 'GET',
+					uri: `https://${subdomain}.zendesk.com/api/v2/ticket_fields.json`,
+					qs: {
+						recent: 0,
+					},
+					json: true,
+					timeout: 5000,
+				};
+
+				try {
+					const response = await this.helpers.request!(options);
+				} catch (error) {
+					return {
+						status: 'Error',
+						message: `Connection details not valid; ${error.message}`,
+					};
+				}
+				return {
+					status: 'OK',
+					message: 'Authentication successful!',
+				};
+			},
+		},
 		loadOptions: {
 			// Get all the custom fields to display them to user so that he can
 			// select them easily