在 Firebase/Angular 应用中使用 sharp API 后 MIME 类型错误

Question

我正在调用 sharp(tmpFilePath).resize(150, 150).toFile(resizedFilePath)（使用尖锐的 api: http://sharp.pixelplumbing.com/en/v0.15.1/api/）但是正在生成的输出文件显示为类型 application/octet-stream 而不是 image/jpeg，这是原始文件类型。我正在通过云功能使用 Angular 和 downloading/uploading 到 Firebase 存储。当我下载源文件并将其上传回 Firebase 而没有先调用 sharp API 时，新上传的文件是预期的 image/jpeg 文件。

我最初是按照本教程学习的 (https://angularfirebase.com/lessons/image-thumbnail-resizer-cloud-function/)，但实际上我无法使用他的方法或 Firebase 文档上的方法访问我的存储桶：const gcs = require('@google-cloud/storage')(); 但我能够访问它通过管理员 const bucket = admin.storage().bucket(object.bucket);。我不得不使用这个变通办法似乎很可疑，但同样，如果我省略 sharp api 调用，我的函数运行良好......所以我只是不知道它是根我的问题的原因？

我在 github (https://github.com/lovell/sharp/issues/1493) 上提交了这个问题，但所有者似乎认为这个问题与 sharp 无关。知道我在这里做错了什么吗？或者至少有人可以帮助我缩小问题范围，以便我可以尝试更好的 google 搜索吗？

原文件：

Sharp 返回的文件 API:

我的函数来自 index.ts：

import * as functions from 'firebase-functions';

import { tmpdir } from 'os';
import { join, dirname } from 'path';

import * as sharp from 'sharp';
import * as fs from 'fs-extra';

const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

export const resizeImages = functions.storage.object().onFinalize(async object => { 
try {
    console.log(object);
    const bucket = admin.storage().bucket(object.bucket);
    const filePath = object.name;
    const fileName:string = filePath.split('/').pop();
    const bucketDir = dirname(filePath);
    console.log("filePath: " + filePath + "; fileName: " + fileName + "; bucketDir: " + bucketDir);

    if (bucketDir === 'profile-image' && object.contentType.includes('image')){
        console.log("A profile picture was added...")
        //The file is a profile picture...
        if (fileName.includes('unsized@')) {
            console.log("The picture that was added hasn't been sized yet...")
            //The file needs to be resized...
                const workingDir = join(tmpdir(), 'thumbs');
                const tmpFilePath = join(workingDir, fileName);

                // 1. Ensure thumbnail dir exists
                await fs.ensureDir(workingDir); 

                // 2. Download Source File
                await bucket.file(filePath).download({
                destination: tmpFilePath
                });
                console.log("Downloaded the source file");
                console.log(tmpFilePath);

                // 3. Resize the image  ********THIS PART IS NOT HAPPENING CORRECTLY
                console.log("About to start resizing...");
                const resizedfileName: string = fileName.split('@').pop();
                const resizedFilePath = join(workingDir, resizedfileName);
                await sharp(tmpFilePath).resize(150, 150).toFile(resizedFilePath);
                console.log("The image resizing is complete: "+ resizedFilePath);

                // 4. Upload the resized image
                const resizedImageUploadSnapshot = await bucket.upload(resizedFilePath, {destination: join('profile-image', resizedfileName)});
                console.log("Uploaded the resized image ");

                // 5. Cleanup remove the tmp/thumbs from the filesystem
                await fs.remove(workingDir);
                console.log("FUNCTION COMPLETED SUCCESSFULLY!")
                return true;
        } else {
            return false;
        }
    } else {     
        console.log('exiting function');
        return false;
    }

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

我的 package.json 函数文件夹中的文件：

{
  "name": "functions",
  "scripts": {
    "lint": "tslint --project tsconfig.json",
    "build": "tsc",
    "serve": "npm run build && firebase serve --only functions",
    "shell": "npm run build && firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "main": "lib/index.js",
  "dependencies": {
    "@google-cloud/storage": "^2.3.1",
    "firebase-admin": "~6.0.0",
    "firebase-functions": "^2.1.0",
    "firebase-tools": "^6.1.1",
    "fs-extra": "^7.0.1",
    "sharp": "^0.21.0",
    "stripe": "^6.15.1"
  },
  "devDependencies": {
    "tslint": "~5.8.0",
    "typescript": "^3.2.1"
  },
  "private": true
}

Answer 1

我通过在路径中添加文件扩展名解决了这个问题，如下所示：

const tmpFilePath = join(workingDir, fileName + '.jpeg');

和

const resizedFilePath = join(workingDir, resizedfileName + '.jpeg');

在 Firebase/Angular 应用中使用 sharp API 后 MIME 类型错误

Wrong MIME type after using sharp API with Firebase/Angular app

angular

image

google-cloud-functions

firebase-storage

sharp