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我正在嘗試使用來自amazon docs的python示例代碼在s3存儲桶上執行「使用授權標頭進行GET」機制。我現在用的源代碼低於：使用python執行s3存儲桶上的問題
# AWS Version 4 signing example
# EC2 API (DescribeRegions)
# See: http://docs.aws.amazon.com/general/latest/gr/sigv4_signing.html
# This version makes a GET request and passes the signature
# in the Authorization header.
import sys, os, base64, datetime, hashlib, hmac
import requests # pip install requests
# ************* REQUEST VALUES *************
method = 'GET'
service = 's3'
host = 's3.amazonaws.com'
region = 'us-east-1'
endpoint = 'http://s3.amazonaws.com/sample_object/foo'
request_parameters = ''
# Key derivation functions. See:
# http://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html#signature-v4-examples-python
def sign(key, msg):
return hmac.new(key, msg.encode('utf-8'), hashlib.sha256).digest()
def getSignatureKey(key, dateStamp, regionName, serviceName):
kDate = sign(('AWS4' + key).encode('utf-8'), dateStamp)
kRegion = sign(kDate, regionName)
kService = sign(kRegion, serviceName)
kSigning = sign(kService, 'aws4_request')
return kSigning
# Read AWS access key from env. variables or configuration file. Best practice is NOT
# to embed credentials in code.
access_key = os.environ.get('AWS_ACCESS_KEY_ID')
secret_key = os.environ.get('AWS_SECRET_ACCESS_KEY')
if access_key is None or secret_key is None:
print 'No access key is available.'
sys.exit()
# Create a date for headers and the credential string
t = datetime.datetime.utcnow()
amzdate = t.strftime('%Y%m%dT%H%M%SZ')
datestamp = t.strftime('%Y%m%d') # Date w/o time, used in credential scope
# ************* TASK 1: CREATE A CANONICAL REQUEST *************
# http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
# Step 1 is to define the verb (GET, POST, etc.)--already done.
# Step 2: Create canonical URI--the part of the URI from domain to query
# string (use '/' if no path)
canonical_uri = '/sample_object/foo'
# Step 3: Create the canonical query string. In this example (a GET request),
# request parameters are in the query string. Query string values must
# be URL-encoded (space=%20). The parameters must be sorted by name.
# For this example, the query string is pre-formatted in the request_parameters variable.
canonical_querystring = request_parameters
# Step 4: Create the canonical headers and signed headers. Header names
# and value must be trimmed and lowercase, and sorted in ASCII order.
# Note that there is a trailing \n.
# amz_content_sha256 = hashlib.sha256('').hexdigest()
amz_content_sha256 = 'UNSIGNED-PAYLOAD'
canonical_headers = 'host:' + host + '\n' + 'x-amz-content-sha256:' + amz_content_sha256 + '\n' + 'x-amz-date:' + amzdate + '\n'
# Step 5: Create the list of signed headers. This lists the headers
# in the canonical_headers list, delimited with ";" and in alpha order.
# Note: The request can include any headers; canonical_headers and
# signed_headers lists those that you want to be included in the
# hash of the request. "Host" and "x-amz-date" are always required.
signed_headers = 'host;x-amz-content-sha256;x-amz-date'
# Step 6: Create payload hash (hash of the request body content). For GET
# requests, the payload is an empty string ("").
payload_hash = hashlib.sha256('').hexdigest()
# Step 7: Combine elements to create create canonical request
canonical_request = method + '\n' + canonical_uri + '\n' + canonical_headers + '\n' + signed_headers + '\n' + payload_hash
# ************* TASK 2: CREATE THE STRING TO SIGN*************
# Match the algorithm to the hashing algorithm you use, either SHA-1 or
# SHA-256 (recommended)
algorithm = 'AWS4-HMAC-SHA256'
credential_scope = datestamp + '/' + region + '/' + service + '/' + 'aws4_request'
string_to_sign = algorithm + '\n' + amzdate + '\n' + credential_scope + '\n' + hashlib.sha256(canonical_request).hexdigest()
# ************* TASK 3: CALCULATE THE SIGNATURE *************
# Create the signing key using the function defined above.
signing_key = getSignatureKey(secret_key, datestamp, region, service)
# Sign the string_to_sign using the signing_key
signature = hmac.new(signing_key, (string_to_sign).encode('utf-8'), hashlib.sha256).hexdigest()
# ************* TASK 4: ADD SIGNING INFORMATION TO THE REQUEST *************
# The signing information can be either in a query string value or in
# a header named Authorization. This code shows how to use a header.
# Create authorization header and add to request headers
authorization_header = algorithm + ' ' + 'Credential=' + access_key + '/' + credential_scope + ', ' + 'SignedHeaders=' + signed_headers + ', ' + 'Signature=' + signature
# The request can include any headers, but MUST include "host", "x-amz-date",
# and (for this scenario) "Authorization". "host" and "x-amz-date" must
# be included in the canonical_headers and signed_headers, as noted
# earlier. Order here is not significant.
# Python note: The 'host' header is added automatically by the Python 'requests' library.
headers = {'x-amz-date':amzdate, 'Authorization':authorization_header, 'x-amz-content-sha256':amz_content_sha256}
# ************* SEND THE REQUEST *************
request_url = endpoint
print '\nBEGIN REQUEST++++++++++++++++++++++++++++++++++++'
print 'Request URL = ' + request_url
r = requests.get(request_url, headers=headers)
print '\nRESPONSE++++++++++++++++++++++++++++++++++++'
print 'Response code: %d\n' % r.status_code
print r.text
我已正確設置訪問ID和祕密訪問鍵。我在boto python庫中使用了相同的功能，並且在列出桶，放置對象等時似乎可行。但是，當我使用上述方法時，我收到403錯誤，指出「我們計算的請求籤名與您提供的簽名不匹配。檢查你的密鑰和簽名方法。「我不確定上述方法有什麼問題。任何指針。？
HTTP 403意味着訪問被禁止。默認情況下，除非您使用AWS SDK提供正確的訪問密鑰或對S3 Bucket策略進行更改，否則S3會將存儲桶保留爲存儲桶創建者專用。要爲S3創建HTTP GET，您需要設置特定的存儲桶策略以允許它。這是一個很長的話題，請閱讀S3訪問控制http://docs.aws.amazon.com/AmazonS3/latest/dev/s3-access-control.html – mootmoot
這是serverfault.com的問題，請在那裏發佈，以獲得更好的迴應。要獲得快速提示，您需要添加匿名訪問以啓用連接：http://docs.aws.amazon.com/AmazonS3/latest/UG/EditingBucketPermissions.html 完成測試後，添加條件密鑰以防止不必要的訪問到你的水桶。 – mootmoot
我認爲你不包括簽名計算中的動作。你已經設置了'request_parameters'來清空字符串，在這個例子中它有一些動作。值得檢查。 – Buchi