如何阻止缺少"DateTimeOriginal"的上传用Fine Uploader提取exif数据? [英] How do I block uploads that lack "DateTimeOriginal" exif data with Fine Uploader?

问题描述

我有一个应用，其中绝对需要在照片上带有DateTimeOriginal时间戳.我可以使用Fine Uploader停止上传并显示消息吗?

I have an app where having the DateTimeOriginal time stamp on photos are absolutely necessary. Is there a way for me to stop uploading and display a message using Fine Uploader?

推荐答案

我从未听说过"taken-at"标签，而且我也不认为这是标准字段.该答案的其余部分假定您确实确实要关注此标签，但是即使您不愿意，您也可以在下面的源代码中进行简单的更改以改为关注另一个EXIF标签.

I've never heard of the "taken-at" tag, and I don't believe this is a standard field. The rest of this answer assumes you really do want to focus on this tag, but even if you don't you can make a simple change in the source code below to focus on another EXIF tag instead.

一种方法是检查onSubmit回调处理程序中的每个文件，并在文件中不包含"taken-at"字段的情况下直接拒绝该文件.以下示例利用 exif-js库来解析图像文件的EXIF数据:

One approach is to check each file in an onSubmit callback handler and simply reject the file is it does not contain a "taken-at" field. The following example utilizes the exif-js library to parse an image file's EXIF data:

var uploader = new qq.FineUploader({
  callbacks: {
     onSubmit: function(id) {
       var blob = this.getFile(id)
       return new Promise(function(resolve, reject) {
         EXIF.getData(blob, function() {
           var takenAt = EXIF.getTag(this, 'taken-at')
           if (takenAt) {
             resolve()
           }
           else {
             reject()
           }
         })
       })
     } 
   }
})

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