bash实例讲解AWS2认证过程

很多新手司机看官方文档AWS2认证部分特别是Authorization怎么生成的总是晦涩难懂，其核心就是StringToSign到底怎么构成

Authorization = "AWS" + " " + AWSAccessKeyId + ":" + Signature;

Signature = Base64( HMAC-SHA1( YourSecretAccessKeyID, UTF-8-Encoding-Of( StringToSign ) ) );

StringToSign = HTTP-Verb + "\n" +
    Content-MD5 + "\n" +
    Content-Type + "\n" +
    Date + "\n" +
    CanonicalizedAmzHeaders +
    CanonicalizedResource;

下面以使用bash向S3上传一个Object为例，具体解释一下整个AWS2的签名过程

#!/bin/bash
ACCESS_KEY="" #填access key
SECRET_KEY="" #填secret key
HOST="s3.cephbook.com" #填S3的Endpoint地址
BUCKET="demo" #填bucket名称
CONTENT_TYPE="application/octet-stream" #MIME
FILENAME=/tmp/demo #文件本地路径
ACL="x-amz-acl:public-read" #Object的ACL
META_DATA="x-amz-meta-ukey:value" #自定义medadata
FILESIZE=$(stat -c%s "$FILENAME")
FILEMD5=`cat ${FILENAME}| openssl dgst -md5 -binary | openssl enc -base64`
AUTH_PATH="/${BUCKET}${FILENAME}"
CURRENT_TIME=`TZ=GMT LANG=en_US date "+%a, %d %b %Y %H:%M:%S GMT"`
stringToSign="PUT\n${FILEMD5}\n${CONTENT_TYPE}\n${CURRENT_TIME}\n${ACL}\n${META_DATA}\n${AUTH_PATH}"
echo $stringToSign
signature=`echo -en ${stringToSign} | openssl sha1 -hmac ${SECRET_KEY} -binary | base64`

curl -s -v -X PUT "http://${HOST}${AUTH_PATH}" \
-H "Authorization: AWS ${ACCESS_KEY}:${signature}" \
-H "Date: ${CURRENT_TIME}" \
-H "Host: ${HOST}" \
-H "Content-Length: ${FILESIZE}" \
-H "Content-MD5: ${FILEMD5} " \
-H "Content-Type: ${CONTENT_TYPE} " \
-H "${ACL} " \
-H "${META_DATA} " \
-T "${FILENAME}"

最后附上官方那懵逼的文档docs.aws.amazon.com/zh\_cn/Amaz…