我的测试脚本是：
// Test file that aquires authorization to list file ids/names from My Drive > ocrTarget
const fs = require('fs');
const fsp = fs.promises;
const path = require('path');
const process = require('process');
const {authenticate} = require('@google-cloud/local-auth');
const {google} = require('googleapis');
// If modifying these scopes, delete token.json.
const SCOPES = ['https://www.googleapis.com/auth/drive'];
// File id of the file to download
const FILEID = '11Sejh6XG-2WzycpcC-MaEmDQJc78LCFg';
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
const TOKEN_PATH = path.join(process.cwd(), 'DownloadFileToken.json');
const CREDENTIALS_PATH = 'C:\\googleDriveDev\\credentials.json';
/**
* Reads previously authorized credentials from the save file.
*
* @return {Promise<OAuth2Client|null>}
*/
async function loadSavedCredentialsIfExist() {
try {
const content = await fsp.readFile(TOKEN_PATH);
const credentials = JSON.parse(content);
return google.auth.fromJSON(credentials);
} catch (err) {
return null;
}
}
/**
* Serializes credentials to a file compatible with GoogleAUth.fromJSON.
*
* @param {OAuth2Client} client
* @return {Promise<void>}
*/
async function saveCredentials(client) {
const content = await fsp.readFile(CREDENTIALS_PATH);
const keys = JSON.parse(content);
const key = keys.installed || keys.web;
const payload = JSON.stringify({
type: 'authorized_user',
client_id: key.client_id,
client_secret: key.client_secret,
refresh_token: client.credentials.refresh_token,
});
await fsp.writeFile(TOKEN_PATH, payload);
}
/**
* Load or request or authorization to call APIs.
*
*/
async function authorize() {
let client = await loadSavedCredentialsIfExist();
if (client) {
return client;
}
client = await authenticate({
scopes: SCOPES,
keyfilePath: CREDENTIALS_PATH,
});
if (client.credentials) {
await saveCredentials(client);
}
return client;
}
/**
* Lists the names and IDs of pageSize number of files (using query to define folder of files)
* @param {google.auth.OAuth2} auth An authorized OAuth2 client.
*/
function listFiles(auth) {
const drive = google.drive({version: 'v3', auth});
drive.files.list({
corpora: 'user',
pageSize: 100,
// files in a parent folder that have not been trashed
// get ID from Drive > Folder by looking at the URL after /folders/
q: `'11Sejh6XG-2WzycpcC-MaEmDQJc78LCFg' in parents and trashed=false`,
fields: 'nextPageToken, files(id, name)',
}, (err, res) => {
if (err) return console.log('The API returned an error: ' + err);
const files = res.data.files;
if (files.length) {
var idFiles = [ ];
files.forEach(function(file, i) {
idFiles.push(file.id);
idFiles.push(file.name);
});
// Store file id/name pairs for use later
var fileIdentity = [];
// Iterate over idFiles array with step of 2
for (var i = 0; i < idFiles.length; i += 2) {
// Push pair of values into d array
fileIdentity.push([idFiles[i], idFiles[i + 1]]);
}
// Access pairs using indices in order to pass an array pair of file id/file name into a function
for (var i = 0; i < fileIdentity.length; i++) {
console.log("File id:", fileIdentity[i][0], "has file name:", fileIdentity[i][1])
}
}
else
{
console.log('No files found.');
}
});
}
authorize().then(listFiles).catch(console.error);
输出：
C:\googleDriveDev>node ./exportTest3.js
File id: 15lsfdIP1Jne-x-rPI57BtWQE3W4ciZzDz9Wy4uU9J98 has file name: 31832_226133__0002-00104
File id: 1RK_172AaDBLji941voUn1TeAg6u6We-UQ8G280e2xsg has file name: 31832_226133__0002-00105
File id: 13B0Kt6PhQYalqh046eXJxnbT9ZCLZDhv2XZqF5SHdV4 has file name: 31832_226133__0002-00106
File id: 1Aj_jQ3nSZAMPlap7fC6lk2uEN7ajIuUL5Kx-JusE1O4 has file name: 31832_226133__0002-00107
File id: 1rTnen5Zhb-aV9k82cNqbbVVl8f54QDGRAdT6o7Ob2b8 has file name: 31832_226133__0002-00108
------------------><---------------
我不想在函数中输出 id/names 数组对
listFiles()fileIdentity我没有太多 JavaScript 经验。我发现练习中简单的函数返回还可以。但这个例子有额外的复杂性。放置
return fileIdentityundefinedThe API returned an error: Error: The request is missing a valid API key.
将此数据放在函数之外有助于将其传递到流程中的下一个函数。
虽然我不确定是否能正确理解你的预期结果，但是下面的修改怎么样？
function listFiles(auth) {
const drive = google.drive({version: 'v3', auth});
drive.files.list({
corpora: 'user',
pageSize: 100,
// files in a parent folder that have not been trashed
// get ID from Drive > Folder by looking at the URL after /folders/
q: `'11Sejh6XG-2WzycpcC-MaEmDQJc78LCFg' in parents and trashed=false`,
fields: 'nextPageToken, files(id, name)',
}, (err, res) => {
if (err) return console.log('The API returned an error: ' + err);
const files = res.data.files;
if (files.length) {
var idFiles = [ ];
files.forEach(function(file, i) {
idFiles.push(file.id);
idFiles.push(file.name);
});
// Store file id/name pairs for use later
var fileIdentity = [];
// Iterate over idFiles array with step of 2
for (var i = 0; i < idFiles.length; i += 2) {
// Push pair of values into d array
fileIdentity.push([idFiles[i], idFiles[i + 1]]);
}
// Access pairs using indices in order to pass an array pair of file id/file name into a function
for (var i = 0; i < fileIdentity.length; i++) {
console.log("File id:", fileIdentity[i][0], "has file name:", fileIdentity[i][1])
}
}
else
{
console.log('No files found.');
}
});
}
authorize().then(listFiles).catch(console.error);
function listFiles(auth) {
const drive = google.drive({ version: "v3", auth });
return new Promise((resolve, reject) => {
drive.files.list(
{
corpora: "user",
pageSize: 100,
// files in a parent folder that have not been trashed
// get ID from Drive > Folder by looking at the URL after /folders/
q: `'11Sejh6XG-2WzycpcC-MaEmDQJc78LCFg' in parents and trashed=false`,
fields: "nextPageToken, files(id, name)",
},
(err, res) => {
// console.log(err);
if (err) {
reject("The API returned an error: " + err);
return;
}
const files = res.data.files;
if (files.length) {
var idFiles = [];
files.forEach(function (file, i) {
idFiles.push(file.id);
idFiles.push(file.name);
});
// Store file id/name pairs for use later
var fileIdentity = [];
// Iterate over idFiles array with step of 2
for (var i = 0; i < idFiles.length; i += 2) {
// Push pair of values into d array
fileIdentity.push([idFiles[i], idFiles[i + 1]]);
}
resolve({ fileIdentity, msg: "" });
} else {
resolve({ fileIdentity: [], msg: "No files found." });
}
}
);
});
}
authorize()
.then(listFiles)
.then(({ fileIdentity, msg }) => {
if (fileIdentity.length > 0) {
for (var i = 0; i < fileIdentity.length; i++) {
console.log("File id:", fileIdentity[i][0], "has file name:", fileIdentity[i][1]);
}
} else {
console.log(msg);
}
})
.catch(console.error);
fileIdentityconsole.log("File id:", fileIdentity[i][0], "has file name:", fileIdentity[i][1])fileIdentityNo files found.console.log(msg)catch(console.error)