从getSignedURL（）检索的链接将在一周内到期

Question

我的画廊缩略图链接收到SignatureDoesNotMatch错误。 这是我下面的firebase谷歌云功能代码段，用于在用户将图像上传到服务器上并使用getSignedURL（）检索链接并最终保存到数据库时创建缩略图。 对于“公告板”类别缩略图链接永远不会过期，但是我不为什么对于“图库”类别缩略图链接会在一周左右过期。但是，两者的代码相同。

'use strict';
const functions = require('firebase-functions');
const admin = require("firebase-admin");
admin.initializeApp();

const {Storage} = require('@google-cloud/storage');

const projectId = 'myprojectid';

// Instantiates a client
const gcs = new Storage({
  projectId: projectId,
});

const path = require('path');
const sharp = require('sharp');
const THUMB_MAX_WIDTH = 300;
const THUMB_MAX_HEIGHT = 300;




exports.thumbnailGen =  functions.storage.object().onFinalize(async (object) => {
  const fileBucket = object.bucket; // The Storage bucket that contains the file.
  const filePath = object.name; // File path in the bucket.
  //console.log('filePath',filePath)
  console.log('object',object)
  const contentType = object.contentType; // File content type.


  const fileDir = path.dirname(filePath); //iadd
  console.log('fileDir',fileDir)
  const lastDir = fileDir.split("/");  //iadd
  console.log('lastDir',lastDir);



  // Exit if this is triggered on a file that is not an image.
  if (!contentType.startsWith('image/')) {
    console.log('This is not an image.');
    return null;
  }

  // Get the file name.
  const fileName = path.basename(filePath);
  // Exit if the image is already a thumbnail.
  //console.log('fileName',fileName)
  if (fileName.startsWith('thumb_')) {
    console.log('Already a Thumbnail.');
    return null;
  }
  /* iadd */
  const filenameWithoutExt = fileName.split('.').shift();
  //console.log('get filenameWithoutExt: ',filenameWithoutExt);
  let exp = /^(.+)_([0-9]+)$/;
  let thekey = filenameWithoutExt.replace(exp, '$1');
  console.log('thekey',thekey)
  // Download file from bucket.
  const bucket = gcs.bucket(fileBucket);

  const metadata = {
    contentType: contentType,
  };
  // We add a 'thumb_' prefix to thumbnails file name. That's where we'll upload the thumbnail.
  const thumbFileName = `thumb_${fileName}`;
  const thumbFilePath = path.join(fileDir, thumbFileName);
  // Create write stream for uploading thumbnail
  const thumbnailUploadStream = bucket.file(thumbFilePath).createWriteStream({metadata});

  let theimageindex = filenameWithoutExt.replace(exp, '$2');
  //console.log('theimageindex',theimageindex)
  /* iadd */

  // Create Sharp pipeline for resizing the image and use pipe to read from bucket read stream
  const pipeline = sharp();
  pipeline
    .resize(THUMB_MAX_WIDTH, THUMB_MAX_HEIGHT)
    .jpeg({ quality: 100 })
    .png({ quality: 100 })
    .max()
    .pipe(thumbnailUploadStream);

  bucket.file(filePath).createReadStream().pipe(pipeline);

  const config = {action: 'read', expires: '03-01-2025' }

  const streamAsPromise = new Promise((resolve, reject) =>
    thumbnailUploadStream.on('finish', resolve).on('error', reject));

    let onlyFileName =  filenameWithoutExt.split('@'); // returns at 2nd index somthing like -L7QEvCNSEJqJAy9DPu5_0 , image without extension but with _0 or _1 etc.
    let createDownloadablepath =  thekey.split('@');

    let thumbFileUrl

    let thumbFile

    let updatedatabasepath = {};

    if (lastDir[1] === 'noticeboard') {

        return streamAsPromise
        .then(() => {
          console.log('Thumbnail created successfully');
          thumbFile = bucket.file(thumbFilePath);
          return thumbFile.getSignedUrl(config)
        })
        .then((results)=>{
          thumbFileUrl = results[0];
          console.log('Got Signed URLs.',thumbFileUrl);
          return admin.database().ref('/'+fileDir+'/'+createDownloadablepath[0]+'/'+createDownloadablepath[1]+'/thumbnails/'+onlyFileName[1]).update({thumbnailURL : thumbFileUrl })
        })
        .then(() => {
          console.log('All done successfully');
          return null
        })

    }

   else if (lastDir[1] === 'gallery' ) {



      return streamAsPromise
        .then(() => {
          console.log('Thumbnail created successfully');
          thumbFile = bucket.file(thumbFilePath);
          return thumbFile.getSignedUrl(config)
        })
        .then((results)=>{
          thumbFileUrl = results[0];
          console.log('Got Signed URLs. upto 03-01-2500',thumbFileUrl);
          updatedatabasepath['/'+fileDir+'/'+createDownloadablepath[0]+'/'+createDownloadablepath[1]+'/thumbnails/'+onlyFileName[1]+'/thumbnailURL'] = thumbFileUrl;
          updatedatabasepath['/'+fileDir+'/'+createDownloadablepath[0]+'/thumbnailURL'] = thumbFileUrl;
          return admin.database().ref().update(updatedatabasepath)
       }).then(() => {
       console.log('All done successfully');
       return null
       })

    }

    else {

      return streamAsPromise
      .then(() => {
        console.log('Thumbnail created successfully');
        return null
      })

    }

}); //exports.thumbnailGen