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我使用下面的代碼做一個簡單的PUT請求AWS S3做錯了使用版本4簽名:以上我所用S3 PUT請求使用AWS簽名版本4
from collections import OrderedDict
from dateutil import parser
import datetime
import hashlib
import hmac
import requests
key_id = "REDACTED"
secret = "REDACTED"
bucket_name = "REDACTED"
def hashb16(message):
return hashlib.sha256(message).hexdigest()
def HMAC(key, message):
return hmac.new(key, message, hashlib.sha256)
current_time = datetime.datetime.utcnow()
url = "https://s3-eu-west-2.amazonaws.com/{}/sometest.txt".format(bucket_name)
payload = "Welcome to Amazon S3."
headers = {
'date': current_time.strftime("%a, %d %b %Y %H:%m:%S GMT"),
'host': "s3-eu-west-2.amazonaws.com",
'x-amz-content-sha256': hashb16(payload),
'x-amz-date': current_time.strftime('%Y%m%dT%H%M%SZ'),
'x-amz-storage-class': 'REDUCED_REDUNDANCY'
}
sorted_headers = sorted([k for k in headers])
region = "eu-west-2"
service = "s3"
# step 1
HTTPRequestMethod = "PUT"
CanonicalURI = "/sometest.txt"
CanonicalQueryString = ""
CanonicalHeaders = ""
for key in sorted_headers:
CanonicalHeaders += "{}:{}\n".format(key.lower(), headers[key])
SignedHeaders = "{}".format(";".join(sorted_headers))
HexEncondeHashRequestPayload = hashb16(payload)
CanonicalRequest = "{}\n{}\n{}\n{}{}\n{}".format(HTTPRequestMethod, CanonicalURI, CanonicalQueryString, CanonicalHeaders, SignedHeaders, HexEncondeHashRequestPayload)
# step 2
Algorithm = "AWS4-HMAC-SHA256"
RequestDateTime = current_time.strftime('%Y%m%dT%H%M%SZ')
CredentialScope = "{}/{}/{}/{}".format(current_time.strftime("%Y%m%d"), region, service, "aws4_request")
HashedCanonicalRequest = hashb16(CanonicalRequest)
StringToSign = "{}\n{}\n{}\n{}".format(Algorithm, RequestDateTime, CredentialScope, HashedCanonicalRequest)
#step 3
kDate = HMAC("AWS4" + secret, current_time.strftime("%Y%m%d")).digest()
kRegion = HMAC(kDate, region).digest()
kService = HMAC(kRegion, service).digest()
kSigning = HMAC(kService, "aws4_request").digest()
signature = HMAC(kSigning, StringToSign).hexdigest()
#step 4
Authorization = "AWS4-HMAC-SHA256 Credential={}/{},SignedHeaders={},Signature={}".format(key_id, CredentialScope, ";".join(sorted_headers), signature)
headers["Authorization"] = Authorization
response = requests.request("PUT", url, headers=headers)
print response.status_code
print response.text
的步驟是每AWS documentation。我使用this page中的示例測試了散列函數,他們結算。
不幸的是,當執行實際的請求時,我得到一個帶有通常的無效簽名消息的403狀態碼。我在上面的代碼中錯過了什麼?