def decrypt_message(self, msg):
raw_data = base64.b64decode(msg)
decrypted = self.cipher.decrypt(raw_data)
plaintext = PKCS7Encoder.decode(decrypted)
decrypted_msg = json.loads(to_text(plaintext))
if decrypted_msg["watermark"]["appid"] != self.app_id:
raise InvalidAppIdException()
return decrypted_msg
def serve_imgs(request, imgs):
if request.method == 'GET':
try:
plain_imgs = imgs_cipher.decrypt(base64.b64decode(imgs))
content = to_text(PKCS7Encoder.decode(plain_imgs))
token = content[:len(settings.WECHAT_TOKEN)]
if token != settings.WECHAT_TOKEN:
raise Exception('Invalid token.')
img_ids = list(
map(int, content[len(settings.WECHAT_TOKEN):].split(',')))
except:
return HttpResponseBadRequest()
paths = ImageData.objects.filter(id__in=img_ids).values_list('image',
flat=True)
if paths.exists():
urls = [reverse('media', kwargs={'path': path}) for path in paths]
return render(request, 'imgs.html', {'imgs': urls})
else:
return Http404()
else:
return HttpResponseBadRequest()
def decrypt(cls, string):
aes = AES.new(cls.key[:16], mode=AES.MODE_ECB)
return PKCS7Encoder.decode(aes.decrypt(base64.decodestring(string)))