binascii.Error: Incorrect padding in python django
binascii.Error: Incorrect padding in python django
我正在尝试将 base64 编码的图像保存在 django rest 框架中。首先，我们做一个代码，将base64编码后的图片插入到imagefield中进行测试，出现如下错误。
binascii.Error: Incorrect padding
我不明白的是，我之前用过同样的代码，并没有出现这样的错误。你能帮助我吗？这是我的代码。
serializers.py
from rest_framework import serializers
from .models import post, comment
class Base64ImageField (serializers.ImageField) :
def to_internal_value (self, data) :
from django.core.files.base import ContentFile
import base64
import six
import uuid
if isinstance(data, six.string_types):
if 'data:' in data and ';base64,' in data :
header, data = data.split(';base64,')
try :
decoded_file = base64.b64decode(data)
except TypeError :
self.fail('invalid_image')
file_name = str(uuid.uuid4())[:12]
file_extension = self.get_file_extension(file_name, decoded_file)
complete_file_name = "%s.%s" % (file_name, file_extension, )
data = ContentFile(decoded_file, name=complete_file_name)
return super(Base64ImageField, self).to_internal_value(data)
def get_file_extension (self, file_name, decoded_file) :
import imghdr
extension = imghdr.what(file_name, decoded_file)
extension = "jpg" if extension == "jpeg" else extension
return extension
class commentSerializer (serializers.ModelSerializer) :
class Meta :
model = comment
fields = '__all__'
class postSerializer (serializers.ModelSerializer) :
author = serializers.CharField(source='author.username', read_only=True)
image1 = Base64ImageField(use_url=True)
image2 = Base64ImageField(use_url=True)
image3 = Base64ImageField(use_url=True)
image4 = Base64ImageField(use_url=True)
image5 = Base64ImageField(use_url=True)
comment = commentSerializer(many=True, read_only=True)
class Meta:
model = post
fields = ['pk', 'author', 'title', 'text', 'image1', 'image2', 'image3', 'image4', 'image5', 'tag1', 'tag2', 'tag3', 'tag4', 'tag5', 'comment']
我不确定这是否适用于您的情况，具体取决于您存储编码数据的位置。
我有同样的错误，但它与一些编码的会话数据有关。我清除了浏览器 Devtools 中的会话数据（cookie、缓存等），它解决了我的问题。
只是张贴这个以防它适用或帮助其他出于同样原因而来的人。
我有同样的错误。我做了所有清除缓存的事情，但它不起作用。现在将浏览器更改为 Mozilla。现在可以使用了。
我遇到了同样的问题。我猜这是因为我一开始使用的是 django 4.0.1，后来切换回 django 2.2...（也许你的问题不是由此引起的，但我只是想提供一些关于问题可能出在哪里的想法reader 遇到此问题并访问此页面。）
Django 4.0.1 应该直接将会话数据以字符串形式保存到数据库中，但是 Django 2.2 将 base64 编码数据保存并读取到/从 table session_data 中的同一列 django_session 在数据库中。
在我的例子中，base64.b64decode() 失败的字符串是 .eJxVjEEOwiAQRe_C2pABCgWX7j0DmRlAqoYmpV0Z765NutDtf-_9l4i4rTVuPS9xSuIslDj9boT8yG0H6Y7tNkue27pMJHdFHrTL65zy83K4fwcVe_3WGtkEHfLg2IMroL1VZA0BFGMJPJhRkdEucypY2CfA7C2HgRHGor14fwDNWjfC:1nERxl:5jJRHXpQH7aZrf2-C99MnTIWARd_cUag76Xa2YjW1yw，这显然不是有效的 base64 字符串，因为符号 : - . . 根本不存在于 base64 字符列表中。
我的完整回溯信息是：
Internal Server Error: /admin
Traceback (most recent call last):
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\base.py", line 189, in _get_session
return self._session_cache
AttributeError: 'SessionStore' object has no attribute '_session_cache'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\Public\django2.2\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "C:\Users\Public\django2.2\lib\site-packages\django\core\handlers\base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\Public\django2.2\lib\site-packages\django\core\handlers\base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\admin\sites.py", line 241, in wrapper
return self.admin_view(view, cacheable)(*args, **kwargs)
File "C:\Users\Public\django2.2\lib\site-packages\django\utils\decorators.py", line 142, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "C:\Users\Public\django2.2\lib\site-packages\django\views\decorators\cache.py", line 44, in _wrapped_view_func
response = view_func(request, *args, **kwargs)
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\admin\sites.py", line 212, in inner
if not self.has_permission(request):
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\admin\sites.py", line 186, in has_permission
return request.user.is_active and request.user.is_staff
File "C:\Users\Public\django2.2\lib\site-packages\django\utils\functional.py", line 256, in inner
self._setup()
File "C:\Users\Public\django2.2\lib\site-packages\django\utils\functional.py", line 392, in _setup
self._wrapped = self._setupfunc()
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\auth\middleware.py", line 24, in <lambda>
request.user = SimpleLazyObject(lambda: get_user(request))
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\auth\middleware.py", line 12, in get_user
request._cached_user = auth.get_user(request)
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\auth\__init__.py", line 182, in get_user
user_id = _get_user_session_key(request)
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\auth\__init__.py", line 59, in _get_user_session_key
return get_user_model()._meta.pk.to_python(request.session[SESSION_KEY])
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\base.py", line 54, in __getitem__
return self._session[key]
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\base.py", line 194, in _get_session
self._session_cache = self.load()
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\db.py", line 44, in load
return self.decode(s.session_data) if s else {}
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\base.py", line 100, in decode
encoded_data = base64.b64decode(session_data.encode('ascii'))
运行 按照 shell
中的命令
from django.contrib.sessions.models import Session
Session.objects.all().delete()
我正在尝试将 base64 编码的图像保存在 django rest 框架中。首先，我们做一个代码，将base64编码后的图片插入到imagefield中进行测试，出现如下错误。
binascii.Error: Incorrect padding
我不明白的是，我之前用过同样的代码，并没有出现这样的错误。你能帮助我吗？这是我的代码。
serializers.py
from rest_framework import serializers
from .models import post, comment
class Base64ImageField (serializers.ImageField) :
def to_internal_value (self, data) :
from django.core.files.base import ContentFile
import base64
import six
import uuid
if isinstance(data, six.string_types):
if 'data:' in data and ';base64,' in data :
header, data = data.split(';base64,')
try :
decoded_file = base64.b64decode(data)
except TypeError :
self.fail('invalid_image')
file_name = str(uuid.uuid4())[:12]
file_extension = self.get_file_extension(file_name, decoded_file)
complete_file_name = "%s.%s" % (file_name, file_extension, )
data = ContentFile(decoded_file, name=complete_file_name)
return super(Base64ImageField, self).to_internal_value(data)
def get_file_extension (self, file_name, decoded_file) :
import imghdr
extension = imghdr.what(file_name, decoded_file)
extension = "jpg" if extension == "jpeg" else extension
return extension
class commentSerializer (serializers.ModelSerializer) :
class Meta :
model = comment
fields = '__all__'
class postSerializer (serializers.ModelSerializer) :
author = serializers.CharField(source='author.username', read_only=True)
image1 = Base64ImageField(use_url=True)
image2 = Base64ImageField(use_url=True)
image3 = Base64ImageField(use_url=True)
image4 = Base64ImageField(use_url=True)
image5 = Base64ImageField(use_url=True)
comment = commentSerializer(many=True, read_only=True)
class Meta:
model = post
fields = ['pk', 'author', 'title', 'text', 'image1', 'image2', 'image3', 'image4', 'image5', 'tag1', 'tag2', 'tag3', 'tag4', 'tag5', 'comment']
我不确定这是否适用于您的情况，具体取决于您存储编码数据的位置。
我有同样的错误，但它与一些编码的会话数据有关。我清除了浏览器 Devtools 中的会话数据（cookie、缓存等），它解决了我的问题。
只是张贴这个以防它适用或帮助其他出于同样原因而来的人。
我有同样的错误。我做了所有清除缓存的事情，但它不起作用。现在将浏览器更改为 Mozilla。现在可以使用了。
我遇到了同样的问题。我猜这是因为我一开始使用的是 django 4.0.1，后来切换回 django 2.2...（也许你的问题不是由此引起的，但我只是想提供一些关于问题可能出在哪里的想法reader 遇到此问题并访问此页面。）
Django 4.0.1 应该直接将会话数据以字符串形式保存到数据库中，但是 Django 2.2 将 base64 编码数据保存并读取到/从 table session_data 中的同一列 django_session 在数据库中。
在我的例子中，base64.b64decode() 失败的字符串是 .eJxVjEEOwiAQRe_C2pABCgWX7j0DmRlAqoYmpV0Z765NutDtf-_9l4i4rTVuPS9xSuIslDj9boT8yG0H6Y7tNkue27pMJHdFHrTL65zy83K4fwcVe_3WGtkEHfLg2IMroL1VZA0BFGMJPJhRkdEucypY2CfA7C2HgRHGor14fwDNWjfC:1nERxl:5jJRHXpQH7aZrf2-C99MnTIWARd_cUag76Xa2YjW1yw，这显然不是有效的 base64 字符串，因为符号 : - . . 根本不存在于 base64 字符列表中。
我的完整回溯信息是：
Internal Server Error: /admin
Traceback (most recent call last):
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\base.py", line 189, in _get_session
return self._session_cache
AttributeError: 'SessionStore' object has no attribute '_session_cache'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\Public\django2.2\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "C:\Users\Public\django2.2\lib\site-packages\django\core\handlers\base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\Public\django2.2\lib\site-packages\django\core\handlers\base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\admin\sites.py", line 241, in wrapper
return self.admin_view(view, cacheable)(*args, **kwargs)
File "C:\Users\Public\django2.2\lib\site-packages\django\utils\decorators.py", line 142, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "C:\Users\Public\django2.2\lib\site-packages\django\views\decorators\cache.py", line 44, in _wrapped_view_func
response = view_func(request, *args, **kwargs)
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\admin\sites.py", line 212, in inner
if not self.has_permission(request):
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\admin\sites.py", line 186, in has_permission
return request.user.is_active and request.user.is_staff
File "C:\Users\Public\django2.2\lib\site-packages\django\utils\functional.py", line 256, in inner
self._setup()
File "C:\Users\Public\django2.2\lib\site-packages\django\utils\functional.py", line 392, in _setup
self._wrapped = self._setupfunc()
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\auth\middleware.py", line 24, in <lambda>
request.user = SimpleLazyObject(lambda: get_user(request))
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\auth\middleware.py", line 12, in get_user
request._cached_user = auth.get_user(request)
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\auth\__init__.py", line 182, in get_user
user_id = _get_user_session_key(request)
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\auth\__init__.py", line 59, in _get_user_session_key
return get_user_model()._meta.pk.to_python(request.session[SESSION_KEY])
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\base.py", line 54, in __getitem__
return self._session[key]
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\base.py", line 194, in _get_session
self._session_cache = self.load()
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\db.py", line 44, in load
return self.decode(s.session_data) if s else {}
File "C:\Users\Public\django2.2\lib\site-packages\django\contrib\sessions\backends\base.py", line 100, in decode
encoded_data = base64.b64decode(session_data.encode('ascii'))
运行 按照 shell
中的命令from django.contrib.sessions.models import Session
Session.objects.all().delete()