@n8n/n8n-nodes-langchain
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;
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Object.defineProperty(exports, "__esModule", { value: true });
exports.McpClient = void 0;
const n8n_workflow_1 = require("n8n-workflow");
const zod_1 = require("zod");
const core_1 = require("zod/v4/core");
const listSearch = __importStar(require("./listSearch"));
const resourceMapping = __importStar(require("./resourceMapping"));
const descriptions_1 = require("../shared/descriptions");
const utils_1 = require("../shared/utils");
class McpClient {
constructor() {
this.description = {
displayName: 'MCP Client',
description: 'Standalone MCP Client',
name: 'mcpClient',
icon: {
light: 'file:../mcp.svg',
dark: 'file:../mcp.dark.svg',
},
group: ['transform'],
version: 1,
defaults: {
name: 'MCP Client',
},
credentials: descriptions_1.credentials,
inputs: [n8n_workflow_1.NodeConnectionTypes.Main],
outputs: [n8n_workflow_1.NodeConnectionTypes.Main],
properties: [
(0, descriptions_1.transportSelect)({
defaultOption: 'httpStreamable',
}),
{
displayName: 'MCP Endpoint URL',
name: 'endpointUrl',
type: 'string',
default: '',
placeholder: 'e.g. https://my-mcp-server.ai/mcp',
required: true,
description: 'The URL of the MCP server to connect to',
},
{
displayName: 'Authentication',
name: 'authentication',
type: 'options',
options: [
{
name: 'Bearer Auth',
value: 'bearerAuth',
},
{
name: 'Header Auth',
value: 'headerAuth',
},
{
name: 'MCP OAuth2',
value: 'mcpOAuth2Api',
},
{
name: 'Multiple Headers Auth',
value: 'multipleHeadersAuth',
},
{
name: 'None',
value: 'none',
},
],
default: 'none',
description: 'The way to authenticate with your endpoint',
},
{
displayName: 'Credentials',
name: 'credentials',
type: 'credentials',
default: '',
displayOptions: {
show: {
authentication: ['headerAuth', 'bearerAuth', 'mcpOAuth2Api', 'multipleHeadersAuth'],
},
},
},
{
displayName: 'Tool',
name: 'tool',
type: 'resourceLocator',
default: { mode: 'list', value: '' },
required: true,
description: 'The tool to use',
modes: [
{
displayName: 'From List',
name: 'list',
type: 'list',
typeOptions: {
searchListMethod: 'getTools',
searchable: true,
skipCredentialsCheckInRLC: true,
},
},
{
displayName: 'ID',
name: 'id',
type: 'string',
},
],
},
{
displayName: 'Input Mode',
name: 'inputMode',
type: 'options',
default: 'manual',
noDataExpression: true,
options: [
{
name: 'Manual',
value: 'manual',
description: 'Manually specify the input data for each tool parameter',
},
{
name: 'JSON',
value: 'json',
description: 'Specify the input data as a JSON object',
},
],
},
{
displayName: 'Parameters',
name: 'parameters',
type: 'resourceMapper',
default: {
mappingMode: 'defineBelow',
value: null,
},
noDataExpression: true,
required: true,
typeOptions: {
loadOptionsDependsOn: ['tool.value'],
resourceMapper: {
resourceMapperMethod: 'getToolParameters',
hideNoDataError: true,
addAllFields: false,
supportAutoMap: false,
mode: 'add',
fieldWords: {
singular: 'parameter',
plural: 'parameters',
},
},
},
displayOptions: {
show: {
inputMode: ['manual'],
},
},
},
{
displayName: 'JSON',
name: 'jsonInput',
type: 'json',
typeOptions: {
rows: 5,
},
default: '{\n "my_field_1": "value",\n "my_field_2": 1\n}\n',
validateType: 'object',
displayOptions: {
show: {
inputMode: ['json'],
},
},
},
{
displayName: 'Options',
name: 'options',
placeholder: 'Add Option',
description: 'Additional options to add',
type: 'collection',
default: {},
options: [
{
displayName: 'Convert to Binary',
name: 'convertToBinary',
type: 'boolean',
default: true,
description: 'Whether to convert images and audio to binary data. If false, images and audio will be returned as base64 encoded strings.',
},
{
displayName: 'Timeout',
name: 'timeout',
type: 'number',
typeOptions: {
minValue: 1,
},
default: 60000,
description: 'Time in ms to wait for tool calls to finish',
},
],
},
],
};
this.methods = {
listSearch,
resourceMapping,
};
}
async execute() {
const authentication = this.getNodeParameter('authentication', 0);
const serverTransport = this.getNodeParameter('serverTransport', 0);
const endpointUrl = this.getNodeParameter('endpointUrl', 0);
const node = this.getNode();
const { headers } = await (0, utils_1.getAuthHeaders)(this, authentication);
const client = await (0, utils_1.connectMcpClient)({
serverTransport,
endpointUrl,
headers,
name: node.type,
version: node.typeVersion,
onUnauthorized: async (headers) => await (0, utils_1.tryRefreshOAuth2Token)(this, authentication, headers),
});
if (!client.ok) {
throw (0, utils_1.mapToNodeOperationError)(node, client.error);
}
try {
const inputMode = this.getNodeParameter('inputMode', 0, 'manual');
const items = this.getInputData();
const returnData = [];
for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
try {
const tool = this.getNodeParameter('tool.value', itemIndex);
const options = this.getNodeParameter('options', itemIndex);
let parameters = {};
if (inputMode === 'manual') {
parameters = this.getNodeParameter('parameters.value', itemIndex);
}
else {
parameters = this.getNodeParameter('jsonInput', itemIndex);
}
const result = (await client.result.callTool({
name: tool,
arguments: parameters,
}, undefined, {
timeout: options.timeout ? Number(options.timeout) : undefined,
}));
let binaryIndex = 0;
const binary = {};
const content = [];
const convertToBinary = options.convertToBinary ?? true;
for (const contentItem of result.content) {
if (contentItem.type === 'text') {
content.push({
...contentItem,
text: (0, n8n_workflow_1.jsonParse)(contentItem.text, { fallbackValue: contentItem.text }),
});
continue;
}
if (convertToBinary && (contentItem.type === 'image' || contentItem.type === 'audio')) {
binary[`data_${binaryIndex}`] = await this.helpers.prepareBinaryData(Buffer.from(contentItem.data, 'base64'), undefined, contentItem.mimeType);
binaryIndex++;
continue;
}
content.push(contentItem);
}
const outputJson = {};
if ((0, utils_1.isStructuredContent)(result.structuredContent)) {
outputJson.structuredContent = { ...result.structuredContent };
}
if (content.length > 0) {
outputJson.content = content;
}
returnData.push({
json: outputJson,
binary: Object.keys(binary).length > 0 ? binary : undefined,
pairedItem: {
item: itemIndex,
},
});
}
catch (e) {
const errorMessage = e instanceof zod_1.ZodError ? (0, core_1.prettifyError)(e) : e instanceof Error ? e.message : String(e);
if (this.continueOnFail()) {
returnData.push({
json: {
error: {
message: errorMessage,
issues: e instanceof zod_1.ZodError ? e.issues : undefined,
},
},
pairedItem: {
item: itemIndex,
},
});
continue;
}
throw new n8n_workflow_1.NodeOperationError(node, errorMessage, {
itemIndex,
});
}
}
return [returnData];
}
finally {
await client.result.close();
}
}
}
exports.McpClient = McpClient;
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