feat(Anthropic Chat Model Node): Add configurable base URL for Anthropic API (#15063)

packages/@n8n/nodes-langchain/credentials/AnthropicApi.credentials.ts

@@ -21,6 +21,13 @@ export class AnthropicApi implements ICredentialType {
 			required: true,
 			default: '',
 		},
+		{
+			displayName: 'Base URL',
+			name: 'url',
+			type: 'string',
+			default: 'https://api.anthropic.com',
+			description: 'Override the default base URL for the API',
+		},
 	];
 
 	authenticate: IAuthenticateGeneric = {
@@ -34,7 +41,7 @@ export class AnthropicApi implements ICredentialType {
 
 	test: ICredentialTestRequest = {
 		request: {
-			baseURL: 'https://api.anthropic.com',
+			baseURL: '={{$credentials?.url}}',
 			url: '/v1/messages',
 			method: 'POST',
 			headers: {

packages/@n8n/nodes-langchain/nodes/llms/LMChatAnthropic/LmChatAnthropic.node.ts

@@ -266,8 +266,10 @@ export class LmChatAnthropic implements INodeType {
 	};
 
 	async supplyData(this: ISupplyDataFunctions, itemIndex: number): Promise<SupplyData> {
-		const credentials = await this.getCredentials('anthropicApi');
+		const credentials = await this.getCredentials<{ url?: string; apiKey?: string }>(
-
+			'anthropicApi',
+		);
+		const baseURL = credentials.url ?? 'https://api.anthropic.com';
 		const version = this.getNode().typeVersion;
 		const modelName =
 			version >= 1.3
@@ -317,8 +319,9 @@ export class LmChatAnthropic implements INodeType {
 		}
 
 		const model = new ChatAnthropic({
-			anthropicApiKey: credentials.apiKey as string,
+			anthropicApiKey: credentials.apiKey,
 			modelName,
+			anthropicApiUrl: baseURL,
 			maxTokens: options.maxTokensToSample,
 			temperature: options.temperature,
 			topK: options.topK,

packages/@n8n/nodes-langchain/nodes/llms/LMChatAnthropic/methods/__tests__/searchModels.test.ts

@@ -40,6 +40,7 @@ describe('searchModels', () => {
 
 	beforeEach(() => {
 		mockContext = {
+			getCredentials: jest.fn().mockResolvedValue({}),
 			helpers: {
 				httpRequestWithAuthentication: jest.fn().mockResolvedValue({
 					data: mockModels,
@@ -50,11 +51,47 @@ describe('searchModels', () => {
 
 	afterEach(() => {
 		jest.clearAllMocks();
+		// Reset the getCredentials mock to its default value
+		mockContext.getCredentials = jest.fn().mockResolvedValue({});
 	});
 
-	it('should fetch models from Anthropic API', async () => {
+	it('should fetch models from default Anthropic API URL when no custom URL is provided', async () => {
 		const result = await searchModels.call(mockContext);
 
+		expect(mockContext.getCredentials).toHaveBeenCalledWith('anthropicApi');
+		expect(mockContext.helpers.httpRequestWithAuthentication).toHaveBeenCalledWith('anthropicApi', {
+			url: 'https://api.anthropic.com/v1/models',
+			headers: {
+				'anthropic-version': '2023-06-01',
+			},
+		});
+		expect(result.results).toHaveLength(5);
+	});
+
+	it('should fetch models from custom Anthropic API URL when provided in credentials', async () => {
+		const customUrl = 'https://custom-anthropic-api.example.com';
+		// Override the default mock to return credentials with a custom URL
+		mockContext.getCredentials = jest.fn().mockResolvedValue({ url: customUrl });
+
+		const result = await searchModels.call(mockContext);
+
+		expect(mockContext.getCredentials).toHaveBeenCalledWith('anthropicApi');
+		expect(mockContext.helpers.httpRequestWithAuthentication).toHaveBeenCalledWith('anthropicApi', {
+			url: `${customUrl}/v1/models`,
+			headers: {
+				'anthropic-version': '2023-06-01',
+			},
+		});
+		expect(result.results).toHaveLength(5);
+	});
+
+	it('should use default URL when empty URL is provided in credentials', async () => {
+		// Override the default mock to return credentials with an empty URL
+		mockContext.getCredentials = jest.fn().mockResolvedValue({ url: null });
+
+		const result = await searchModels.call(mockContext);
+
+		expect(mockContext.getCredentials).toHaveBeenCalledWith('anthropicApi');
 		expect(mockContext.helpers.httpRequestWithAuthentication).toHaveBeenCalledWith('anthropicApi', {
 			url: 'https://api.anthropic.com/v1/models',
 			headers: {

packages/@n8n/nodes-langchain/nodes/llms/LMChatAnthropic/methods/searchModels.ts

@@ -15,8 +15,11 @@ export async function searchModels(
 	this: ILoadOptionsFunctions,
 	filter?: string,
 ): Promise<INodeListSearchResult> {
+	const credentials = await this.getCredentials<{ url?: string }>('anthropicApi');
+
+	const baseURL = credentials.url ?? 'https://api.anthropic.com';
 	const response = (await this.helpers.httpRequestWithAuthentication.call(this, 'anthropicApi', {
-		url: 'https://api.anthropic.com/v1/models',
+		url: `${baseURL}/v1/models`,
 		headers: {
 			'anthropic-version': '2023-06-01',
 		},