[英]Upload directly to S3 from django
我真的被困在這里了。
我希望能夠從django表單直接上傳到S3。 這將用於保存顯示圖片。
我跟着這個: http : //django-storages.readthedocs.org/en/latest/backends/amazon-S3.html
但不幸的是,我不得不加入
DEFAULT_FILE_STORAGE = 'storages.backends.s3.S3Storage'
由於某種原因到settings.py。 django甚至不承認我所做的改變。 (我把它更改為DEFAULT_FILE_STORAGE ='asdsfsdfsdf',它甚至沒有給出錯誤。有趣的是,我甚至不知道django-storages是否具有我正在尋找的功能。
這不是太難。 步驟是生成策略文檔,對其進行簽名,然后使用該簽名將文件POST到S3。 我寫了一個名為sbit3的小應用程序。 看看這里: https : //github.com/victortrac/sbit3/blob/master/server/sbit3.py ,特別是PostHandler類:
class PostHandler(tornado.web.RequestHandler):
def _generate_policy_doc(self, conditions, expiration=None):
if not expiration:
# Sets a policy of 15 minutes to upload file
expiration = datetime.datetime.utcnow() + datetime.timedelta(minutes=15)
conditions = [ { "bucket" : conditions["bucket"] },
[ "starts-with", "$key", "uploads/"],
{ "acl" : conditions["acl"] },
{ "success_action_redirect" : conditions["success_action_redirect"] } ]
conditions_json = json.dumps({ "expiration" : expiration.strftime("%Y-%m-%dT%H:%M:%SZ"),
"conditions" : conditions })
logging.debug("Policy doc generated: {0}".format(conditions_json))
return base64.b64encode(conditions_json)
def _sign_policy(self, policy):
signature = base64.b64encode(hmac.new(settings.aws_secret_key, policy, hashlib.sha1).digest())
return signature
def get(self, expiration):
try:
expiration = int(expiration)
# Set max expiration to 7200 minutes (5 days)
if not 0 < expiration < 7200:
raise tornado.web.HTTPError(403)
_expireTimestamp = datetime.datetime.utcnow() + datetime.timedelta(minutes=expiration)
except ValueError:
raise tornado.web.HTTPError(403)
# Associate _uuid to expiration in sdb
_uuid = uuid.uuid4().hex
sdb_conn.add_item(_uuid, expireTimestamp=_expireTimestamp)
conditions = { "bucket" : settings.bucket,
"acl" : settings.acl,
"success_action_redirect" : settings.site_url + "/f/" + _uuid }
policy_document = self._generate_policy_doc(conditions)
signature = self._sign_policy(policy_document)
self.render("post.html", conditions=conditions,
aws_access_id=settings.aws_access_id,
policy_document=policy_document,
signature=signature)
查看設置表單的post.html :
<form action="https://{{ conditions["bucket"] }}.s3.amazonaws.com" method="post" enctype="multipart/form-data">
<input type="hidden" name="key" value="uploads/${filename}">
<input type="hidden" name="AWSAccessKeyId" value="{{ aws_access_id }}">
<input type="hidden" name="acl" value="{{ conditions["acl"] }}">
<input type="hidden" name="success_action_redirect" value="{{ conditions["success_action_redirect"] }}">
<input type="hidden" name="policy" value="{{ policy_document }}">
<input type="hidden" name="signature" value="{{ signature }}">
File to upload to S3:
<input name="file" type="file">
<br>
<input type="submit" value="Upload File to S3">
</form>
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