Django/Tastypie 图像上传 - 多部分中的边界无效：无？

Question

我是 python/django/tastypie 的新手，正在尝试上传文件。我遇到了一个非常奇怪的（对我来说是）错误，我似乎无法弄清楚。每当我尝试通过我的 REST 客户端（CocoaRest 客户端）上传照片时，它都会出现以下错误：

{
  "error_message" : "Invalid boundary in multipart: None",
  "traceback" : "Traceback (most recent call last):\n\n  File \"/Users/crown/Documents/Sources/Virtualenvs/GOCApi/lib/python2.7/site-packages/tastypie/resources.py\", line 195, in wrapper\n    response = callback(request, *args, **kwargs)\n\n  File \"/Users/crown/Documents/Sources/GOCApi/api/resources/member.py\", line 85, in post_profile_picture\n    if('image' in request.FILES):\n\n  File \"/Users/crown/Documents/Sources/Virtualenvs/GOCApi/lib/python2.7/site-packages/django/core/handlers/wsgi.py\", line 214, in _get_files\n    self._load_post_and_files()\n\n  File \"/Users/crown/Documents/Sources/Virtualenvs/GOCApi/lib/python2.7/site-packages/django/http/request.py\", line 217, in _load_post_and_files\n    self._post, self._files = self.parse_file_upload(self.META, data)\n\n  File \"/Users/crown/Documents/Sources/Virtualenvs/GOCApi/lib/python2.7/site-packages/django/http/request.py\", line 176, in parse_file_upload\n    parser = MultiPartParser(META, post_data, self.upload_handlers, self.encoding)\n\n  File \"/Users/crown/Documents/Sources/Virtualenvs/GOCApi/lib/python2.7/site-packages/django/http/multipartparser.py\", line 69, in __init__\n    raise MultiPartParserError('Invalid boundary in multipart: %s' % boundary)\n\nMultiPartParserError: Invalid boundary in multipart: None\n"
}

我设置了标题“Content-Type: multipart/form-data”，并在文件选项卡中添加了一个文件。

这是我从客户端调用的方法：

def post_profile_picture(self, request, *args, **kwargs):
        if(request.method == 'POST'):
            if(str(request.META['CONTENT_TYPE']) != "multipart/form-data"):
                return self.create_response(request, HelperMethods.api_return_msg("Unsupported media type"), response_class=http.HttpBadRequest)
            else:
                if('image' in request.FILES):

                    #bunch of code removed

                    return self.create_response(request, {"profile_img" : profile_img_key_name, "thumb_img" : thumb_img_key_name}, response_class=http.HttpResponse)
                else:
                    return self.create_response(request, HelperMethods.api_return_msg("No image found"), response_class=http.HttpBadRequest)
        else:
            return self.create_response(request, HelperMethods.api_return_msg("Method not allowed"), response_class=http.HttpMethodNotAllowed)

当我在 if('image' in request.FILES) 之前执行 print(request) 时，我没有收到同样的错误，它实际上跳转到我的 else 并打印“未找到图像”，这很奇怪不会以同样的方式爆炸。

我不确定我还需要做什么，添加更多标题？设置一个“边界”（不确定那是什么）......非常感谢任何帮助。我愿意尝试并在这里发布结果以获得更好的帮助。谢谢！

Answer 1

最终创建了一个新的 ModelResource，然后将 Content-Type 设置为：multipart/form-data;边界=边界

我花了一段时间才弄清楚这一点，尽管 OP 是昨天的，10 个小时是很多谷歌搜索和反复试验...... smdh。

这里是模型资源：

from tastypie import http, fields
from django.conf.urls import url
from tastypie.resources import ModelResource
from api.helper_methods import HelperMethods
from django.conf import settings
from boto.s3.connection import S3Connection
from boto.s3.key import Key
import cStringIO
from PIL import Image, ImageOps

class FileUploadResource(ModelResource):
    img = fields.FileField(attribute="img", null=True, blank=True)
    class Meta:
        allowed_methods = 'post'
        resource_name = 'file_upload'
        include_resource_uri = False

    def prepend_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/$" % self._meta.resource_name, self.wrap_view('get_profile_picture'), name="api_get_profile_picture"),
            url(r"^(?P<resource_name>%s)/profile_picture/$" % self._meta.resource_name, self.wrap_view('post_profile_picture'), name="api_post_profile_picture"),
            ]

    def get_profile_picture(self, request, **kwargs):
        return self.create_response(request, HelperMethods.api_return_msg("Bad requested"), response_class=http.HttpBadRequest)

    def post_profile_picture(self, request, **kwargs):
        if(request.method == 'POST'):
            if "multipart/form-data" not in str(request.META['CONTENT_TYPE']):
                return self.create_response(request, HelperMethods.api_return_msg("Unsupported media type"), response_class=http.HttpBadRequest)
            else:
                if('image' in request.FILES):
                    upload = request.FILES['image']
                    main_img = Image.open(upload)

                    profile_img = main_img.resize((200,200), Image.ANTIALIAS)
                    profile_img_io = cStringIO.StringIO()
                    profile_img.save(profile_img_io, 'PNG', quality=85)

                    thumb_img = main_img.resize((80,80), Image.ANTIALIAS)
                    thumb_img_io = cStringIO.StringIO()
                    thumb_img.save(thumb_img_io, 'PNG', quality=85)

                    conn = S3Connection(settings.AWS_ACCESS_KEY_ID, settings.AWS_SECRET_ACCESS_KEY)
                    bucket = conn.get_bucket(settings.BUCKET_NAME)

                    profile_img_key_name = HelperMethods.generate_pic_key() + ".png"
                    profile_img_key = Key(bucket)
                    profile_img_key.key = profile_img_key_name
                    profile_img_key.set_contents_from_string(profile_img_io.getvalue())
                    profile_img_key.make_public()

                    thumb_img_key_name = HelperMethods.generate_pic_key() + ".png"
                    thumb_img_key = Key(bucket)
                    thumb_img_key.key = thumb_img_key_name
                    thumb_img_key.set_contents_from_string(thumb_img_io.getvalue())
                    thumb_img_key.make_public()

                    return self.create_response(request, {"profile_img" : profile_img_key_name, "thumb_img" : thumb_img_key_name}, response_class=http.HttpResponse)
                else:
                    return self.create_response(request, HelperMethods.api_return_msg("No image found"), response_class=http.HttpBadRequest)
        else:
            return self.create_response(request, HelperMethods.api_return_msg("Method not allowed"), response_class=http.HttpMethodNotAllowed)

在使用PIL换图后也使用amazon s3来存储图片。