n8n
Version:
n8n Workflow Automation Tool
155 lines • 6.01 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
var ownKeys = function(o) {
ownKeys = Object.getOwnPropertyNames || function (o) {
var ar = [];
for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
return ar;
};
return ownKeys(o);
};
return function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
__setModuleDefault(result, mod);
return result;
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.mapApprovalToSdk = mapApprovalToSdk;
exports.createAuthFetch = createAuthFetch;
exports.buildMcpClientForServer = buildMcpClientForServer;
const ai_utilities_1 = require("@n8n/ai-utilities");
const n8n_workflow_1 = require("n8n-workflow");
function mapApprovalToSdk(approval) {
if (!approval)
return undefined;
if (approval.mode === 'global')
return true;
return approval.tools;
}
function isTokenData(tokenData) {
return (typeof tokenData === 'object' &&
tokenData !== null &&
'access_token' in tokenData &&
typeof tokenData.access_token === 'string');
}
async function deriveAuthHeaders(server, credentialProvider) {
if (server.authentication === 'none' || !server.credential)
return {};
const resolved = await credentialProvider.resolve(server.credential).catch(() => null);
if (!resolved)
return {};
if ((0, n8n_workflow_1.isMcpOAuth2Authentication)(server.authentication)) {
const tokenData = resolved.oauthTokenData;
if (!isTokenData(tokenData))
return {};
return {
Authorization: `Bearer ${tokenData.access_token}`,
};
}
switch (server.authentication) {
case 'bearerAuth': {
const token = typeof resolved.token === 'string' ? resolved.token : '';
return token ? { Authorization: `Bearer ${token}` } : {};
}
case 'headerAuth': {
const name = typeof resolved.name === 'string' ? resolved.name : '';
const value = typeof resolved.value === 'string' ? resolved.value : '';
return name && value ? { [name]: value } : {};
}
case 'multipleHeadersAuth': {
const headers = resolved.headers;
if (!headers ||
typeof headers !== 'object' ||
!('values' in headers) ||
!Array.isArray(headers.values)) {
return {};
}
const values = headers.values;
const out = {};
for (const entry of values) {
if (typeof entry.name === 'string' && typeof entry.value === 'string') {
out[entry.name] = entry.value;
}
}
return out;
}
default:
return {};
}
}
function headersToRecord(headers) {
if (!headers)
return {};
if (headers instanceof Headers)
return Object.fromEntries(headers.entries());
if (Array.isArray(headers))
return Object.fromEntries(headers);
return headers;
}
function createAuthFetch({ initialHeaders, onUnauthorized, }) {
let headers = initialHeaders;
return async (input, init) => {
const response = await (0, ai_utilities_1.proxyFetch)(input, {
...init,
headers: { ...headersToRecord(init?.headers), ...headers },
});
if (response.status !== 401 || !onUnauthorized)
return response;
const refreshed = await onUnauthorized();
if (!refreshed)
return response;
headers = refreshed;
return await (0, ai_utilities_1.proxyFetch)(input, {
...init,
headers: { ...headersToRecord(init?.headers), ...headers },
});
};
}
async function buildMcpClientForServer(server, deps) {
const { credentialProvider, oauthService, projectId } = deps;
const { McpClient } = await Promise.resolve().then(() => __importStar(require('@n8n/agents')));
const initialHeaders = await deriveAuthHeaders(server, credentialProvider);
const onUnauthorized = (0, n8n_workflow_1.isMcpOAuth2Authentication)(server.authentication) && server.credential
? async () => {
const credentialId = server.credential;
if (!credentialId)
return null;
return await oauthService
.refreshOAuth2CredentialById(credentialId, projectId)
.catch(() => null);
}
: undefined;
const authFetch = createAuthFetch({ initialHeaders, onUnauthorized });
const sdkServerConfig = {
name: server.name,
url: server.url,
transport: server.transport,
fetch: authFetch,
toolFilter: server.toolFilter,
requireApproval: mapApprovalToSdk(server.approval),
...(server.connectionTimeoutMs !== undefined && {
connectionTimeoutMs: server.connectionTimeoutMs,
}),
};
return new McpClient([sdkServerConfig]);
}
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