Django音频文件验证

如何解决Django音频文件验证

| 我正在尝试一个允许用户上传音频文件的网站。我已经阅读了所有可以动手使用的文档，但是找不到太多有关验证文件的信息。这里共有newb（以前从未进行过任何形式的任何文件验证），并试图弄清楚这一点。有人可以牵着我的手告诉我我需要知道什么吗？一如既往，谢谢您。

解决方法

您需要先验证文件，然后再将其写入磁盘。当您上载文件时，表单将得到验证，然后上载的文件将被传递到处理程序/方法，该处理程序/方法将实际写入服务器磁盘。因此，在这两个操作之间，您需要执行一些自定义验证，以确保它是有效的音频文件你可以：检查文件是否小于一定大小（好的做法）然后检查提交的文件是否具有特定的内容类型（即音频文件）这是没有用的，因为有人可以轻易地欺骗它然后检查文件是否以某个扩展名（或多个扩展名）结尾这也很没用尝试读取文件，看看它是否真正是音频（我尚未测试此代码） models.py

class UserSong(models.Model):
    title = models.CharField(max_length=100)
    audio_file = models.FileField()

表格

class UserSongForm(forms.ModelForm):
     # Add some custom validation to our file field
     def clean_audio_file(self):
         file = self.cleaned_data.get(\'audio_file\',False):
         if file:
             if file._size > 4*1024*1024:
                   raise ValidationError(\"Audio file too large ( > 4mb )\")
             if not file.content-type in [\"audio/mpeg\",\"audio/...\"]:
                   raise ValidationError(\"Content-Type is not mpeg\")
             if not os.path.splitext(file.name)[1] in [\".mp3\",\".wav\" ...]:
                   raise ValidationError(\"Doesn\'t have proper extension\")
             # Here we need to now to read the file and see if it\'s actually 
             # a valid audio file. I don\'t know what the best library is to 
             # to do this
             if not some_lib.is_audio(file.content):
                   raise ValidationError(\"Not a valid audio file\")
             return file
         else:
             raise ValidationError(\"Couldn\'t read uploaded file\")

views.py 从utils导入handle_uploaded_file

def upload_file(request):
    if request.method == \'POST\':
        form = UserSongForm(request.POST,request.FILES)
        if form.is_valid():
            # If we are here,the above file validation has completed
            # so we can now write the file to disk
            handle_uploaded_file(request.FILES[\'file\'])
            return HttpResponseRedirect(\'/success/url/\')
    else:
        form = UploadFileForm()
    return render_to_response(\'upload.html\',{\'form\': form})

utils.py

# from django\'s docs
def handle_uploaded_file(f):
    ext = os.path.splitext(f.name)[1]
    destination = open(\'some/file/name%s\'%(ext),\'wb+\')
    for chunk in f.chunks():
        destination.write(chunk)
    destination.close()

https://docs.djangoproject.com/en/dev/topics/http/file-uploads/#file-uploads https://docs.djangoproject.com/en/dev/ref/forms/fields/#filefield https://docs.djangoproject.com/zh-CN/dev/ref/files/file/#django.core.files.File