上传时错误的图像方向 – Amazon S3

我让用户使用Multer-S3将多个图像直接上传到Amazon-S3,然后通过循环在前端显示这些图像。 所有的作品完美。

但是,当通过手机上传图片(在iPhone或Android上拍摄的图片)时,手机的方向是正确的,但在桌面上没有正确的方向。 主要问题。

这是由于我相信图像的EXIF数据。

看起来像ImageMagick或Kraken JS https://kraken.io/docs/storage-s3可能是一种解决方法,但对于我的生活,我无法弄清楚如何以我上传和显示图像的方式来实现如下所示。

如何更改我的代码以自动定位图像? 注意:它必须适用于多个图像

谢谢你的帮助!

下面是我让用户直接向Amazon-S3上传多个图片的方式:

aws.config.update({ secretAccessKey: 'AccessKey', accessKeyId: 'KeyID', region: 'us-east-2' }); var s3 = new aws.S3(); var storage = multerS3({ limits : { files: 25 }, s3: s3, bucket: 'files', key: function (req, file, cb) { var fileExtension = file.originalname.split(".")[1]; var path = "uploads/" + req.user._id + Date.now() + "." + fileExtension; cb(null, path); }, }) var upload = multer({storage: storage}).any("images", 25); router.post("/", middleware.isLoggedIn, function(req, res, next){ upload(req,res,function(err) { if(err) { console.log(err); res.redirect('/') } Listings.findById(req.params.id, function(err, foundListings){ var allimages = [] if(typeof req.files !== "undefined") { for(var i = 0; i < req.files.length; i++) { allimages.push(req.files[i].key); } } var currentimages = allimages; var newListings = {currentimages:currentimages} //Removed the other Model aspects Listings.create(newListings, function(err, newlyCreated){ if(err){ console.log(err); } else { res.redirect("/listings"); } }); }); 

我如何在前端显示图像。 Listings.currentimages是一个包含所有图像链接的数组。

 app.locals.awspath = "https://s3.us-east-2.amazonaws.com/myfiles/"; 

// awspath是我的Amazon-S3path的文件path

 <div id='allimages'> <% for(var i = 0; i < listings.currentimages.length; i++ ) { %> <div class='smallerImages'> <% var url2 = awspath + listings.currentimages[i] %> <img class="small" src="<%= url2 %>"> </div> <% } %> </div> 

       

网上收集的解决方案 "上传时错误的图像方向 – Amazon S3"

问题是iOS设置图像的EXIF元数据导致这种行为。 您可以使用可以读取EXIF元数据并为您旋转图像的库。

jpeg-autorotatehttps://github.com/johansatge/jpeg-autorotate )是一个非常简单的库,并有非常好的文档(你应该检查出来)。

 var jo = require('jpeg-autorotate'); var fs = require('fs'); // var options = {quality: 85}; var options = {}; var path = '/tmp/Portrait_8.jpg'; // You can use a Buffer, too jo.rotate(path, options, function(error, buffer, orientation) { if (error) { console.log('An error occurred when rotating the file: ' + error.message); return; } console.log('Orientation was: ' + orientation); // upload the buffer to s3, save to disk or more ... fs.writeFile("/tmp/output.jpg", buffer, function(err) { if(err) { return console.log(err); } console.log("The file was saved!"); }); }); 

您可以从这里find一些带有不同EXIF旋转元数据的示例图像

转换为AWS Lambda函数

 // Name this file index.js and zip it + the node_modules then upload to AWS Lambda console.log('Loading function'); var aws = require('aws-sdk'); var s3 = new aws.S3({apiVersion: '2006-03-01'}); var jo = require('jpeg-autorotate'); // Rotate an image given a buffer var autorotateImage = function(data, callback) { jo.rotate(data, {}, function(error, buffer, orientation) { if (error) { console.log('An error occurred when rotating the file: ' + error.message); callback(error, null); } else { console.log('Orientation was: ' + orientation); callback(null, buffer); } }); }; // AWS Lambda runs this on every new file upload to s3 exports.handler = function(event, context, callback) { console.log('Received event:', JSON.stringify(event, null, 2)); // Get the object from the event and show its content type var bucket = event.Records[0].s3.bucket.name; var key = event.Records[0].s3.object.key; s3.getObject({Bucket: bucket, Key: key}, function(err, data) { if (err) { console.log("Error getting object " + key + " from bucket " + bucket + ". Make sure they exist and your bucket is in the same region as this function."); callback("Error getting file: " + err, null); } else { // log the content type, should be an image console.log('CONTENT TYPE:', data.ContentType); // rotate the image autorotateImage(data.Body, function(error, image) { if (error) { callback("Error rotating image: " + error, null); } const params = { Bucket: bucket, Key: 'rotated/' + key, Body: image }; // Upload new image, careful not to upload it in a path that will trigger the function again! s3.putObject(params, function (err, data) { if (error) { callback("Error uploading rotated image: " + error, null); } else { console.log("Successfully uploaded image on S3", data); // call AWS Lambda's callback, function was successful!!! callback(null, data); } }); }); } }); }; 

备注此function将旋转后的图像上传到同一个存储桶,但您可以轻松更改该存储。 如果您刚开始使用AWS Lambda,则build议您详细了解它( https://www.youtube.com/watch?v=eOBq__h4OJ4,https://www.youtube.com/watch?v=PEatXsXIkLc

确保你有正确的权限(读写),正确的function触发器,创buildfunction时正确的“处理程序”! 确保在CloudWatch中检出function日志,使debugging更容易。 如果开始超时,增加function超时并增加内存。