n8n/packages/nodes-base/nodes/Google/Books/GenericFunctions.ts

147 lines
3.4 KiB
TypeScript

import { OptionsWithUri } from 'request';
import { IExecuteFunctions, IExecuteSingleFunctions, ILoadOptionsFunctions } from 'n8n-core';
import { IDataObject, NodeApiError } from 'n8n-workflow';
import moment from 'moment-timezone';
import jwt from 'jsonwebtoken';
interface IGoogleAuthCredentials {
delegatedEmail?: string;
email: string;
inpersonate: boolean;
privateKey: string;
}
async 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.replace(/\\n/g, '\n').trim();
const signature = jwt.sign(
{
iss: credentials.email,
sub: credentials.delegatedEmail ?? credentials.email,
scope: scopes.join(' '),
aud: 'https://oauth2.googleapis.com/token',
iat: now,
exp: now + 3600,
},
privateKey,
{
algorithm: 'RS256',
header: {
kid: privateKey,
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,
};
return this.helpers.request(options);
}
export async function googleApiRequest(
this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions,
method: string,
resource: string,
body: any = {},
qs: IDataObject = {},
uri?: string,
headers: IDataObject = {},
): Promise<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}`;
return await this.helpers.request(options);
} else {
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> {
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;
}