使用Google App Engine的Google云端存储签名网址

Question

处理Google云端存储的常规签名URL(查询字符串身份验证)令人沮丧.

Google云端存储签名网址示例 - >这是否是整个互联网中唯一可用于生成Google云端存储签名网址的代码？如果需要,我应该全部阅读并手动修改Pure Python GAE吗？

当你将它与已经包含在任何SDK中的AWS S3 getAuthenticatedURL()进行比较时,这很荒谬......

我错过了一些明显的东西,还是每个人都面临同样的问题？这是怎么回事？

Answer 1

以下是Go中的操作方法:

func GenerateSignedURLs(c appengine.Context, host, resource string, expiry time.Time, httpVerb, contentMD5, contentType string) (string, error) {
    sa, err := appengine.ServiceAccount(c)
    if err != nil {
        return "", err
    }
    expUnix := expiry.Unix()
    expStr := strconv.FormatInt(expUnix, 10)
    sl := []string{
        httpVerb,
        contentMD5,
        contentType,
        expStr,
        resource,
    }
    unsigned := strings.Join(sl, "\n")
    _, b, err := appengine.SignBytes(c, []byte(unsigned))
    if err != nil {
        return "", err
    }
    sig := base64.StdEncoding.EncodeToString(b)
    p := url.Values{
        "GoogleAccessId": {sa},
        "Expires": {expStr},
        "Signature": {sig},
    }
    return fmt.Sprintf("%s%s?%s", host, resource, p.Encode()), err
}

Answer 2

查看https://github.com/GoogleCloudPlatform/gcloud-python/pull/56

在 Python 中，这确实...

import base64
import time
import urllib
from datetime import datetime, timedelta

from Crypto.Hash import SHA256
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from OpenSSL import crypto

method = 'GET'
resource = '/bucket-name/key-name'
content_md5, content_type = None, None

expiration = datetime.utcnow() + timedelta(hours=2)
expiration = int(time.mktime(expiration.timetuple()))

# Generate the string to sign.
signature_string = '\n'.join([
  method,
  content_md5 or '',
  content_type or '',
  str(expiration),
  resource])

# Take our PKCS12 (.p12) key and make it into a RSA key we can use...
private_key = open('/path/to/your-key.p12', 'rb').read()
pkcs12 = crypto.load_pkcs12(private_key, 'notasecret')
pem = crypto.dump_privatekey(crypto.FILETYPE_PEM, pkcs12.get_privatekey())
pem_key = RSA.importKey(pem)

# Sign the string with the RSA key.
signer = PKCS1_v1_5.new(pem_key)
signature_hash = SHA256.new(signature_string)
signature_bytes = signer.sign(signature_hash)
signature = base64.b64encode(signature_bytes)

# Set the right query parameters.
query_params = {'GoogleAccessId': 'your-service-account@googleapis.com',
                'Expires': str(expiration),
                'Signature': signature}

# Return the built URL.
return '{endpoint}{resource}?{querystring}'.format(
    endpoint=self.API_ACCESS_ENDPOINT, resource=resource,
    querystring=urllib.urlencode(query_params))