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import { google } from "googleapis";
import { createInterface } from "readline";
import { readFile, writeFile } from "fs";
import { OAuth2Client, Credentials } from "google-auth-library";
import { Opt } from "../../../new_fields/Doc";
import { GlobalOptions } from "googleapis-common";
import { GaxiosResponse } from "gaxios";
import request = require('request-promise');
import * as qs from 'query-string';
import Photos = require('googlephotos');
import { Database } from "../../database";
/**
* Server side authentication for Google Api queries.
*/
export namespace GoogleApiServerUtils {
// If modifying these scopes, delete token.json.
const prefix = 'https://www.googleapis.com/auth/';
const SCOPES = [
'documents.readonly',
'documents',
'presentations',
'presentations.readonly',
'drive',
'drive.file',
'photoslibrary',
'photoslibrary.appendonly',
'photoslibrary.sharing',
'userinfo.profile'
];
export const parseBuffer = (data: Buffer) => JSON.parse(data.toString());
export enum Service {
Documents = "Documents",
Slides = "Slides"
}
export interface CredentialInformation {
credentialsPath: string;
userId: string;
}
export type ApiResponse = Promise<GaxiosResponse>;
export type ApiRouter = (endpoint: Endpoint, parameters: any) => ApiResponse;
export type ApiHandler = (parameters: any, methodOptions?: any) => ApiResponse;
export type Action = "create" | "retrieve" | "update";
export type Endpoint = { get: ApiHandler, create: ApiHandler, batchUpdate: ApiHandler };
export type EndpointParameters = GlobalOptions & { version: "v1" };
export const GetEndpoint = (sector: string, paths: CredentialInformation) => {
return new Promise<Opt<Endpoint>>(resolve => {
RetrieveCredentials(paths).then(authentication => {
let routed: Opt<Endpoint>;
let parameters: EndpointParameters = { auth: authentication.client, version: "v1" };
switch (sector) {
case Service.Documents:
routed = google.docs(parameters).documents;
break;
case Service.Slides:
routed = google.slides(parameters).presentations;
break;
}
resolve(routed);
});
});
};
export const RetrieveAccessToken = (information: CredentialInformation) => {
return new Promise<string>((resolve, reject) => {
RetrieveCredentials(information).then(
credentials => resolve(credentials.token.access_token!),
error => reject(`Error: unable to authenticate Google Photos API request.\n${error}`)
);
});
};
const RetrieveOAuthClient = async (information: CredentialInformation) => {
return new Promise<OAuth2Client>((resolve, reject) => {
readFile(information.credentialsPath, async (err, credentials) => {
if (err) {
reject(err);
return console.log('Error loading client secret file:', err);
}
const { client_secret, client_id, redirect_uris } = parseBuffer(credentials).installed;
resolve(new google.auth.OAuth2(client_id, client_secret, redirect_uris[0]));
});
});
};
export const GenerateAuthenticationUrl = async (information: CredentialInformation) => {
const client = await RetrieveOAuthClient(information);
return client.generateAuthUrl({
access_type: 'offline',
scope: SCOPES.map(relative => prefix + relative),
});
};
export interface GoogleAuthenticationResult {
access_token: string;
avatar: string;
name: string;
}
export const ProcessClientSideCode = async (information: CredentialInformation, authenticationCode: string): Promise<GoogleAuthenticationResult> => {
const oAuth2Client = await RetrieveOAuthClient(information);
return new Promise<GoogleAuthenticationResult>((resolve, reject) => {
oAuth2Client.getToken(authenticationCode, async (err, token) => {
if (err || !token) {
reject(err);
return console.error('Error retrieving access token', err);
}
oAuth2Client.setCredentials(token);
const enriched = injectUserInfo(token);
await Database.Auxiliary.GoogleAuthenticationToken.Write(information.userId, enriched);
const { given_name, picture } = enriched.userInfo;
resolve({
access_token: enriched.access_token!,
avatar: picture,
name: given_name
});
});
});
};
/**
* It's pretty cool: the credentials id_token is split into thirds by periods.
* The middle third contains a base64-encoded JSON string with all the
* user info contained in the interface below. So, we isolate that middle third,
* base64 decode with atob and parse the JSON.
* @param credentials the client credentials returned from OAuth after the user
* has executed the authentication routine
*/
const injectUserInfo = (credentials: Credentials): EnrichedCredentials => {
const userInfo = JSON.parse(atob(credentials.id_token!.split(".")[1]));
return { ...credentials, userInfo };
};
export type EnrichedCredentials = Credentials & { userInfo: UserInfo };
export interface UserInfo {
at_hash: string;
aud: string;
azp: string;
exp: number;
family_name: string;
given_name: string;
iat: number;
iss: string;
locale: string;
name: string;
picture: string;
sub: string;
}
export const RetrieveCredentials = (information: CredentialInformation) => {
return new Promise<TokenResult>((resolve, reject) => {
readFile(information.credentialsPath, async (err, credentials) => {
if (err) {
reject(err);
return console.log('Error loading client secret file:', err);
}
authorize(parseBuffer(credentials), information.userId).then(resolve, reject);
});
});
};
export const RetrievePhotosEndpoint = (paths: CredentialInformation) => {
return new Promise<any>((resolve, reject) => {
RetrieveAccessToken(paths).then(
token => resolve(new Photos(token)),
reject
);
});
};
type TokenResult = { token: Credentials, client: OAuth2Client };
/**
* Create an OAuth2 client with the given credentials, and returns the promise resolving to the authenticated client
* @param {Object} credentials The authorization client credentials.
*/
export function authorize(credentials: any, userId: string): Promise<TokenResult> {
const { client_secret, client_id, redirect_uris } = credentials.installed;
const oAuth2Client = new google.auth.OAuth2(client_id, client_secret, redirect_uris[0]);
return new Promise<TokenResult>((resolve, reject) => {
// Attempting to authorize user (${userId})
Database.Auxiliary.GoogleAuthenticationToken.Fetch(userId).then(token => {
if (token!.expiry_date! < new Date().getTime()) {
// Token has expired, so submitting a request for a refreshed access token
return refreshToken(token!, client_id, client_secret, oAuth2Client, userId).then(resolve, reject);
}
// Authentication successful!
oAuth2Client.setCredentials(token!);
resolve({ token: token!, client: oAuth2Client });
});
});
}
const refreshEndpoint = "https://oauth2.googleapis.com/token";
const refreshToken = (credentials: Credentials, client_id: string, client_secret: string, oAuth2Client: OAuth2Client, userId: string) => {
return new Promise<TokenResult>(resolve => {
let headerParameters = { headers: { 'Content-Type': 'application/x-www-form-urlencoded' } };
let queryParameters = {
refreshToken: credentials.refresh_token,
client_id,
client_secret,
grant_type: "refresh_token"
};
let url = `${refreshEndpoint}?${qs.stringify(queryParameters)}`;
request.post(url, headerParameters).then(async response => {
let { access_token, expires_in } = JSON.parse(response);
const expiry_date = new Date().getTime() + (expires_in * 1000);
await Database.Auxiliary.GoogleAuthenticationToken.Update(userId, access_token, expiry_date);
credentials.access_token = access_token;
credentials.expiry_date = expiry_date;
oAuth2Client.setCredentials(credentials);
resolve({ token: credentials, client: oAuth2Client });
});
});
};
}
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