n8n/packages/nodes-base/nodes/Google/Books/GenericFunctions.ts
Omar Ajoue d3fecb9f6d
🎨 Centralize error throwing for encryption keys and credentials (#3105)
* Centralized error throwing for encryption key

* Unifying the error message used by cli and core packages

* Improvements to error messages to make it more DRY

* Removed unnecessary throw

* Throwing error when credential does not exist to simplify node behavior (#3112)

Co-authored-by: Iván Ovejero <ivov.src@gmail.com>
2022-04-15 08:00:47 +02:00

135 lines
3.6 KiB
TypeScript

import {
OptionsWithUri,
} from 'request';
import {
IExecuteFunctions,
IExecuteSingleFunctions,
ILoadOptionsFunctions,
} from 'n8n-core';
import {
IDataObject, NodeApiError, NodeOperationError,
} from 'n8n-workflow';
import moment from 'moment-timezone';
import jwt from 'jsonwebtoken';
interface IGoogleAuthCredentials {
delegatedEmail?: string;
email: string;
inpersonate: boolean;
privateKey: string;
}
export async function googleApiRequest(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri?: string, headers: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
const authenticationMethod = this.getNodeParameter('authentication', 0, 'serviceAccount') as string;
const options: OptionsWithUri = {
headers: {
'Content-Type': 'application/json',
},
method,
body,
qs,
uri: uri || `https://www.googleapis.com/books/${resource}`,
json: true,
};
try {
if (Object.keys(headers).length !== 0) {
options.headers = Object.assign({}, options.headers, headers);
}
if (Object.keys(body).length === 0) {
delete options.body;
}
if (authenticationMethod === 'serviceAccount') {
const credentials = await this.getCredentials('googleApi') as {
email: string;
privateKey: string;
};
const { access_token } = await getAccessToken.call(this, credentials as unknown as IGoogleAuthCredentials);
options.headers!.Authorization = `Bearer ${access_token}`;
//@ts-ignore
return await this.helpers.request(options);
} else {
//@ts-ignore
return await this.helpers.requestOAuth2.call(this, 'googleBooksOAuth2Api', options);
}
} catch (error) {
if (error.code === 'ERR_OSSL_PEM_NO_START_LINE') {
error.statusCode = '401';
}
throw new NodeApiError(this.getNode(), error);
}
}
export async function googleApiRequestAllItems(this: IExecuteFunctions | ILoadOptionsFunctions, propertyName: string, method: string, endpoint: string, body: any = {}, query: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
const returnData: IDataObject[] = [];
let responseData;
query.maxResults = 40;
do {
responseData = await googleApiRequest.call(this, method, endpoint, body, query);
returnData.push.apply(returnData, responseData[propertyName] || []);
} while (
returnData.length < responseData.totalItems
);
return returnData;
}
function getAccessToken(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, credentials: IGoogleAuthCredentials): Promise<IDataObject> {
//https://developers.google.com/identity/protocols/oauth2/service-account#httprest
const scopes = [
'https://www.googleapis.com/auth/books',
];
const now = moment().unix();
credentials.email = credentials.email.trim();
const privateKey = (credentials.privateKey as string).replace(/\\n/g, '\n').trim();
const signature = jwt.sign(
{
'iss': credentials.email as string,
'sub': credentials.delegatedEmail || credentials.email as string,
'scope': scopes.join(' '),
'aud': `https://oauth2.googleapis.com/token`,
'iat': now,
'exp': now + 3600,
},
privateKey as string,
{
algorithm: 'RS256',
header: {
'kid': privateKey as string,
'typ': 'JWT',
'alg': 'RS256',
},
},
);
const options: OptionsWithUri = {
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
},
method: 'POST',
form: {
grant_type: 'urn:ietf:params:oauth:grant-type:jwt-bearer',
assertion: signature,
},
uri: 'https://oauth2.googleapis.com/token',
json: true,
};
//@ts-ignore
return this.helpers.request(options);
}