n8n/packages/nodes-base/nodes/Aws/GenericFunctions.ts

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import { URL } from 'url';
import { sign } from 'aws4';
import { OptionsWithUri } from 'request';
import { parseString } from 'xml2js';
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import {
IExecuteFunctions,
IHookFunctions,
ILoadOptionsFunctions,
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IWebhookFunctions,
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} from 'n8n-core';
import {
ICredentialDataDecryptedObject,
} from 'n8n-workflow';
function getEndpointForService(service: string, credentials: ICredentialDataDecryptedObject): string {
let endpoint;
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if (service === 'lambda' && credentials.lambdaEndpoint) {
endpoint = credentials.lambdaEndpoint;
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} else if (service === 'sns' && credentials.snsEndpoint) {
endpoint = credentials.snsEndpoint;
} else {
endpoint = `https://${service}.${credentials.region}.amazonaws.com`;
}
return (endpoint as string).replace('{region}', credentials.region as string);
}
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export async function awsApiRequest(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions, service: string, method: string, path: string, body?: string, headers?: object): Promise<any> { // tslint:disable-line:no-any
const credentials = this.getCredentials('aws');
if (credentials === undefined) {
throw new Error('No credentials got returned!');
}
// Concatenate path and instantiate URL object so it parses correctly query strings
const endpoint = new URL(getEndpointForService(service, credentials) + path);
// Sign AWS API request with the user credentials
const signOpts = { headers: headers || {}, host: endpoint.host, method, path, body };
sign(signOpts, { accessKeyId: `${credentials.accessKeyId}`.trim(), secretAccessKey: `${credentials.secretAccessKey}`.trim() });
const options: OptionsWithUri = {
headers: signOpts.headers,
method,
uri: endpoint.href,
body: signOpts.body,
};
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try {
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return await this.helpers.request!(options);
} catch (error) {
const errorMessage = (error.response && error.response.body.message) || (error.response && error.response.body.Message) || error.message;
if (error.statusCode === 403) {
if (errorMessage === 'The security token included in the request is invalid.') {
throw new Error('The AWS credentials are not valid!');
} else if (errorMessage.startsWith('The request signature we calculated does not match the signature you provided')) {
throw new Error('The AWS credentials are not valid!');
}
}
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throw new Error(`AWS error response [${error.statusCode}]: ${errorMessage}`);
}
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}
export async function awsApiRequestREST(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions, service: string, method: string, path: string, body?: string, headers?: object): Promise<any> { // tslint:disable-line:no-any
const response = await awsApiRequest.call(this, service, method, path, body, headers);
try {
return JSON.parse(response);
} catch (e) {
return response;
}
}
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export async function awsApiRequestSOAP(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions, service: string, method: string, path: string, body?: string, headers?: object): Promise<any> { // tslint:disable-line:no-any
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const response = await awsApiRequest.call(this, service, method, path, body, headers);
try {
return await new Promise((resolve, reject) => {
parseString(response, { explicitArray: false }, (err, data) => {
if (err) {
return reject(err);
}
resolve(data);
});
});
} catch (e) {
return response;
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}
}