feat: Add new credentials for the HTTP Request node (#9833)

Co-authored-by: Jonathan Bennetts <jonathan.bennetts@gmail.com>
Co-authored-by: Shireen Missi <94372015+ShireenMissi@users.noreply.github.com>

packages/nodes-base/credentials/DatadogApi.credentials.ts

@@ -0,0 +1,73 @@
+import type {
+	ICredentialDataDecryptedObject,
+	ICredentialTestRequest,
+	ICredentialType,
+	IHttpRequestOptions,
+	INodeProperties,
+} from 'n8n-workflow';
+
+export class DatadogApi implements ICredentialType {
+	name = 'datadogApi';
+
+	displayName = 'Datadog API';
+
+	documentationUrl = 'datadog';
+
+	icon = { light: 'file:icons/Datadog.svg', dark: 'file:icons/Datadog.svg' } as const;
+
+	httpRequestNode = {
+		name: 'Datadog',
+		docsUrl: 'https://docs.datadoghq.com/api/latest/',
+		apiBaseUrlPlaceholder: 'https://api.datadoghq.com/api/v1/metrics',
+	};
+
+	properties: INodeProperties[] = [
+		{
+			displayName: 'URL',
+			name: 'url',
+			required: true,
+			type: 'string',
+			default: 'https://api.datadoghq.com',
+		},
+		{
+			displayName: 'API Key',
+			name: 'apiKey',
+			required: true,
+			type: 'string',
+			typeOptions: { password: true },
+			default: '',
+		},
+		{
+			displayName: 'APP Key',
+			name: 'appKey',
+			required: false,
+			type: 'string',
+			default: '',
+			typeOptions: { password: true },
+			description: 'For some endpoints, you also need an Application key.',
+		},
+	];
+
+	async authenticate(
+		credentials: ICredentialDataDecryptedObject,
+		requestOptions: IHttpRequestOptions,
+	): Promise<IHttpRequestOptions> {
+		requestOptions.headers = {
+			'DD-API-KEY': credentials.apiKey,
+			'DD-APPLICATION-KEY': credentials.appKey,
+		};
+		if (!requestOptions.headers['DD-APPLICATION-KEY']) {
+			delete requestOptions.headers['DD-APPLICATION-KEY'];
+		}
+
+		return requestOptions;
+	}
+
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: '={{$credentials.url}}',
+			url: '/api/v1/validate',
+			method: 'GET',
+		},
+	};
+}