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

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import { URL } from 'url';
import { Request, sign } from 'aws4';
import { OptionsWithUri } from 'request';
import { parseString } from 'xml2js';
import {
IExecuteFunctions,
IHookFunctions,
ILoadOptionsFunctions,
IWebhookFunctions,
} from 'n8n-core';
import {
ICredentialDataDecryptedObject,
ICredentialTestFunctions,
IHttpRequestOptions,
NodeApiError,
} from 'n8n-workflow';
function getEndpointForService(
service: string,
credentials: ICredentialDataDecryptedObject,
): string {
let endpoint;
if (service === 'lambda' && credentials.lambdaEndpoint) {
endpoint = credentials.lambdaEndpoint;
} 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);
}
export async function awsApiRequest(
this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions,
service: string,
method: string,
path: string,
body?: string,
headers?: object,
): Promise<any> {
const credentials = await this.getCredentials('aws');
const requestOptions = {
qs: {
service,
path,
},
method,
body,
url: '',
headers,
region: credentials?.region as string,
} as IHttpRequestOptions;
try {
return await this.helpers.requestWithAuthentication.call(this, 'aws', requestOptions);
} catch (error) {
if (error?.response?.data || error?.response?.body) {
const errorMessage = error?.response?.data || error?.response?.body;
if (errorMessage.includes('AccessDeniedException')) {
const user = JSON.parse(errorMessage).Message.split(' ')[1];
throw new NodeApiError(this.getNode(), error, {
message: 'Unauthorized — please check your AWS policy configuration',
description: `Make sure an identity-based policy allows user ${user} to perform textract:AnalyzeExpense`,
});
}
}
throw new NodeApiError(this.getNode(), error); // no XML parsing needed
}
}
export async function awsApiRequestREST(
this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions,
service: string,
method: string,
path: string,
body?: string,
headers?: object,
): Promise<any> {
const response = await awsApiRequest.call(this, service, method, path, body, headers);
try {
return JSON.parse(response);
} catch (error) {
return response;
}
}
export async function awsApiRequestSOAP(
this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions,
service: string,
method: string,
path: string,
body?: string,
headers?: object,
): Promise<any> {
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 (error) {
return response;
}
}
export function simplify(data: IExpenseDocument) {
const result: { [key: string]: string } = {};
for (const document of data.ExpenseDocuments) {
for (const field of document.SummaryFields) {
result[field?.Type?.Text || field?.LabelDetection?.Text] = field.ValueDetection.Text;
}
}
return result;
}
export interface IExpenseDocument {
ExpenseDocuments: [
{
SummaryFields: [
{
LabelDetection: { Text: string };
ValueDetection: { Text: string };
Type: { Text: string };
},
];
},
];
}
export async function validateCredentials(
this: ICredentialTestFunctions,
decryptedCredentials: ICredentialDataDecryptedObject,
service: string,
): Promise<any> {
const credentials = decryptedCredentials;
// Concatenate path and instantiate URL object so it parses correctly query strings
const endpoint = new URL(
getEndpointForService(service, credentials) + `?Action=GetCallerIdentity&Version=2011-06-15`,
);
// Sign AWS API request with the user credentials
const signOpts = {
host: endpoint.host,
method: 'POST',
path: '?Action=GetCallerIdentity&Version=2011-06-15',
} as Request;
const securityHeaders = {
accessKeyId: `${credentials.accessKeyId}`.trim(),
secretAccessKey: `${credentials.secretAccessKey}`.trim(),
sessionToken: credentials.temporaryCredentials
? `${credentials.sessionToken}`.trim()
: undefined,
};
sign(signOpts, securityHeaders);
const options: OptionsWithUri = {
headers: signOpts.headers,
method: 'POST',
uri: endpoint.href,
body: signOpts.body,
};
const response = await this.helpers.request!(options);
return new Promise((resolve, reject) => {
parseString(response, { explicitArray: false }, (err, data) => {
if (err) {
return reject(err);
}
resolve(data);
});
});
}