FAQ

OSS allows you to include a signature in the Authorization header or in a URL. The following table lists the differences between the two methods.

Header	URL
expires is not supported.	expires is supported.
Methods: GET, POST, PUT, and DELETE.	Methods: GET and PUT.
The date is in GMT.	date is replaced with expires to specify timestamps.
Signatures are not URL-encoded.	Signatures are URL-encoded.

"The request signature we calculated does not match the signature you provided" is displayed when OSS calculates a signature from the Authorization header or a URL. The following code provides an example on how to upload an object to OSS when you use the self-signed mode and call API operations:

#! /us/bin/envy python
#Author: hanli
#Update: 2018-09-29

from optparse import OptionParser
import urllib, urllib2
import datetime
import base64
import hmac
import sha
import os
import sys
import time


class Main():
  
  # Initial input parse

  def __init__(self,options):

    self.ak = options.ak
    self.sk = options.sk
    self.ed = options.ed
    self.bk = options.bk
    self.fi = options.fi
    self.oj = options.objects
    self.left = '\033[1;31;40m'
    self.right = '\033[0m'
    self.types = "application/x-www-form-urlencoded"    
    self.url = 'http://{0}.{1} /{2}'.format(self.bk,self.ed,self.oj)

  # Check client input parse

  def CheckParse(self):

    if (self.ak and self.sk and self.ed and self.bk and self.oj and self.fi) ! = None:
      if str(self.ak and self.sk and self.ed and self.bk and self.oj and self.fi):
        self.PutObject()
    else:
      self.ConsoleLog("error","Input parameters cannot be empty")

  # GET local GMT time

  def GetGMT(self):
  
    SRM = datetime.datetime.utcnow()
    GMT = SRM.strftime('%a, %d %b %Y %H:%M:%S GMT')
    
    return GMT

  # GET Signature

  def GetSignature(self):

    mac = hmac.new("{0}".format(self.sk),"PUT\n\n{0}\n{1}\n/{2}/{3}".format(self.types,self.GetGMT(),self.bk,self.oj), sha)
    Signature = base64.b64encode(mac.digest())
   
    return Signature

  # PutObject

  def PutObject(self):
   
    try: 
      with open(self.fi) as fd:
        files = fd.read()
    except Exception as e:
      self.ConsoleLog("error",e)
  
    try:
      request = urllib2.Request(self.url, files)
      request.add_header('Host','{0}.{1} '.format(self.bk,self.ed))
      request.add_header('Date','{0}'.format(self.GetGMT()))
      request.add_header('Authorization','OSS {0}:{1}'.format(self.ak,self.GetSignature()))
      request.get_method = lambda:'PUT'
      response = urllib2.urlopen(request,timeout=10)
      fd.close()
      self.ConsoleLog(response.code,response.headers)
    except Exception,e:
      self.ConsoleLog("error",e)
 
  # output error log

  def ConsoleLog(self,level=None,mess=None):

    if level == "error":
      sys.exit('{0}[ERROR:]{1}{2}'.format(self.left,self.right,mess))
    else:
      sys.exit('\nHTTP/1.1 {0} OK\n{1}'.format(level,mess))

if __name__ == "__main__":

  parser = OptionParser()
  parser.add_option("-i",dest="ak",help="Must fill in Accesskey")
  parser.add_option("-k",dest="sk",help="Must fill in AccessKeySecrety")
  parser.add_option("-e",dest="ed",help="Must fill in endpoint")
  parser.add_option("-b",dest="bk",help="Must fill in bucket")
  parser.add_option("-o",dest="objects",help="File name uploaded to oss")
  parser.add_option("-f",dest="fi",help="Must fill localfile path")

  (options, args) = parser.parse_args()
  handler = Main(options)
  handler.CheckParse()

Request headers:

PUT /yuntest HTTP/1.1
Accept-Encoding: identity
Content-Length: 147
Connection: close
User-Agent: Python-urllib/2.7
Date: Sat, 22 Sep 2018 04:36:52 GMT
Host: yourBucket.oss-cn-shanghai.aliyuncs.com
Content-Type: application/x-www-form-urlencoded
Authorization: OSS B0g3mdt:lNCA4L0P43Ax

Response headers:

HTTP/1.1 200 OK
Server: AliyunOSS
Date: Sat, 22 Sep 2018 04:36:52 GMT
Content-Length: 0
Connection: close
x-oss-request-id: 5BA5C6E4059A3C2F
ETag: "D0CAA153941AAA1CBDA38AF"
x-oss-hash-crc64ecma: 8478734191999037841
Content-MD5: 0MqhU5QbIp3Ujqqhy9o4rw==
x-oss-server-time: 15

The following figure shows the HTTP request captured when the request is sent using a browser.