如何将已保存的 blob 作为附件通过电子邮件发送？

Question

我通过javascript将pdf作为blob发送到django，然后尝试将其作为电子邮件附件发送。

我的代码是：

def SendPrescriptionbyMail(request, cliniclabel, patient_id):

    from django.core.files.storage import default_storage

    print(request.FILES)

    print(request.FILES['file'])

    myform = forms.Form(request.POST, request.FILES)

    file = myform.files['file']

    print(file)

    file_name = default_storage.save(file.name, file)

    file = default_storage.open(file_name)

    print(f'file_name is {file_name}')

    file_url = default_storage.url(file_name)

    print(f'Or maybe {file_url}')

    recipient = 'joel@domain'

    import smtplib

    from email.mime.text import MIMEText

    from email.mime.multipart import MIMEMultipart

    msg = MIMEMultipart()

    msg['Subject'] = "Your prescription"

    msg['From']    = "admin@me"

    msg['To']      = recipient

    msg.preamble = 'Your prescription is attached'

    msg.attach(MIMEText(file(file_name).read()))

    s = smtplib.SMTP('smtp.mailgun.org', 587)

    s.login('myid@somewhere', 'apikey')

    s.sendmail(msg['From'], msg['To'], msg.as_string())

    s.quit()

    return HttpResponse('Successfully sent email')

输出：

<MultiValueDict: {'file': [<TemporaryUploadedFile: blob (application/pdf)>]}>

blob

blob

file_name is blob_4VZxpHY

Or maybe /data/blob_4VZxpHY

2018-11-14 19:02:36,554 django.request ERROR    Internal Server Error: /clinic/madhav/prescription/sendemail/patient/18

Traceback (most recent call last):

File "/home/joel/.local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner

response = get_response(request)

File "/home/joel/.local/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response

response = self.process_exception_by_middleware(e, request)

File "/home/joel/.local/lib/python3.6/site-packages/django/core/handlers/base.py", line 124, in _get_response