Nodejs - 无法从谷歌驱动器获取文件数据

Question

我正在尝试从谷歌驱动器获取文件数据。 为此，我已经完成了https://developers.google.com/drive/api/v3/quickstart/nodejs

中提到的所有步骤

我还可以获取驱动器中的文件列表。但我不明白如何获取文件中的数据。我已经尝试了在谷歌中找到的以下代码，但我得到的响应为undefined。

这是我的代码

    const fs = require('fs');
const readline = require('readline');
const {google} = require('googleapis');
const zlib = require("zlib");
const creds = require("../../../credentials.json")
const getfilelist = require("google-drive-getfilelist");
module.exports = async (req, res) => {
    try {
// If modifying these scopes, delete token.json.
const SCOPES = ['https://www.googleapis.com/auth/drive'];
// 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 = 'token.json';

// Load client secrets from a local file.

  authorize(creds, listFiles);

/**
 * Create an OAuth2 client with the given credentials, and then execute the
 * given callback function.
 * @param {Object} credentials The authorization client credentials.
 * @param {function} callback The callback to call with the authorized client.
 */
function authorize(credentials, callback) {
  const oAuth2Client = new google.auth.OAuth2(
    credentials.client_id, credentials.client_secret, credentials.redirect_uris[0]);

  // Check if we have previously stored a token.
  fs.readFile(TOKEN_PATH, (err, token) => {
    if (err) return getAccessToken(oAuth2Client, callback);
    oAuth2Client.setCredentials(JSON.parse(token));
    callback(oAuth2Client);
  });
}

/**
 * Get and store new token after prompting for user authorization, and then
 * execute the given callback with the authorized OAuth2 client.
 * @param {google.auth.OAuth2} oAuth2Client The OAuth2 client to get token for.
 * @param {getEventsCallback} callback The callback for the authorized client.
 */
function getAccessToken(oAuth2Client, callback) {
  const authUrl = oAuth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: SCOPES,
  });
  console.log('Authorize this app by visiting this url:', authUrl);
  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
  });
  rl.question('Enter the code from that page here: ', (code) => {
    rl.close();
    oAuth2Client.getToken(code, (err, token) => {
      if (err) return console.error('Error retrieving access token', err);
      oAuth2Client.setCredentials(token);
      // Store the token to disk for later program executions
      fs.writeFile(TOKEN_PATH, JSON.stringify(token), (err) => {
        if (err) return console.error(err);
        console.log('Token stored to', TOKEN_PATH);
      });
      callback(oAuth2Client);
    });
  });
}

/**
 * Lists the names and IDs of up to 10 files.
 * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
 */
function listFiles(auth) {
  const topFolderId = "1MTER3d8AVkpw0-_32xpxzZtyuP8iMH66"; // Please set the top folder ID.
getfilelist.GetFileList(
  {
    auth: auth,
    fields: "files(*)",
    id: topFolderId,
  },
  (err, res) => {
    if (err) {
      console.log(err);
      return;
    }
    const fileList = res.fileList.flatMap(({ files }) => files);
    fileList.map((file) => {
      console.log('iiiiii',file)
      downloadFile(auth, file.id)
    });
  }
);
}

function downloadFile(auth, fileId) {const drive = google.drive({version: 'v3', auth});
console.log('fileIdfileId',fileId)
let progress = 0;
drive.files.get({
  fileId: fileId,
  alt: 'media'
},
function(err, { data }) {
  console.log('actual data', data);
  var bdata = Buffer.from(data, 'utf8')
  console.log('buffered data', bdata)
})




}
} catch (error) {
    console.log(error);
}
};

在代码 console.log('actual data',bdata) 附近，我得到的输出类似于PK"♠�S↕word/numbering.xml��MN�0►�O�↔"��$§ ¶5� 6�♥���X�=��I��q��R$��U��������Kɠ�h♣��ˈ♦\3Ȅ.R���x"�uTgT��)9rK���u��J�9�}�Gh�(���9���e%W�.�p�9���/§�Ce▬♀��N�¶�↑���t↑HI�:�►♂%↑��ܝ$ ���� ��Jv�*ŵ;;�����☺�-��=Mͥ�b�C�♫Q+��k�¶�♀i��dk�f♠�qk��][∟�q4a� 'Ġ���OϾ‼E�▲0�t\�♠���vF�↓ga�F�қ�#����.�y^ꍘ��+�W� PI‼C⌂h☺=♣PK"♠�S◄word/settings.xml���n�0♀ǟ�►���I6↑uzX�����=#ɶ►}A����'ǖդ@�f�H⌂�?�♀M?>�§|q��2%K��R��↕+�d]�?�?����:�♦���Dgj����cWX���♂O��►�D�s�H↕�����♦8⌂5u"�∟[��Jhp��8s�$O�-→1�D��ňX

在 console.log('buffered data', bdata) 附近，我得到的输出为<Buffer 50 4b 03 04 14 00 08 08 08 00 22 06 ef bf bd 53 00 00 00 00 00 00 00 00 00 00 00 00 12 00 00 00 77 6f 72 64 2f 6e 75 6d 62 65 72 69 6e 67 2e 78 6d 6c ... 15880 more bytes>

如何从文件中获取实际文本。

有人可以帮忙

Answer 1

尝试遵循documentation中的代码

function downloadFile(auth, fileId) {
    const drive = google.drive({
        version: 'v3',
        auth
    });
    var dest = fs.createWriteStream('./sample.txt');
    drive.files.get({
            fileId: fileId,
            alt: 'media'
        })
        .on('end', function() {
            console.log('Done');
        })
        .on('error', function(err) {
            console.log('Error during download', err);
        })
        .pipe(dest);
}

Answer 2

问题：

您正在使用drive.metadata.readonly 范围授权应用程序，这不会让您访问文件内容，也不会让您下载它。

解决办法：

删除您生成的token.json，修改代码中的SCOPES，使用drive 等适当的范围，然后再次通过授权：

const SCOPES = ['https://www.googleapis.com/auth/drive'];

参考：

• Authorizing requests with OAuth 2.0