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package cs
import (
"net/http"
"sort"
"strings"
"log"
"github.com/denverdino/aliyungo/util"
)
func (client *Client) signRequest(request *http.Request) {
headers := request.Header
contentMd5 := headers.Get("Content-Md5")
contentType := headers.Get("Content-Type")
accept := headers.Get("Accept")
date := headers.Get("Date")
canonicalizedResource := request.URL.RequestURI()
_, canonicalizedHeader := canonicalizeHeader(headers)
stringToSign := request.Method + "\n" + accept + "\n" + contentMd5 + "\n" + contentType + "\n" + date + "\n" + canonicalizedHeader + canonicalizedResource
if client.debug {
log.Printf("stringToSign = %s: ", stringToSign)
}
signature := util.CreateSignature(stringToSign, client.AccessKeySecret)
headers.Set("Authorization", "acs "+client.AccessKeyId+":"+signature)
}
const headerOSSPrefix = "x-acs-"
//Have to break the abstraction to append keys with lower case.
func canonicalizeHeader(headers http.Header) (newHeaders http.Header, result string) {
var canonicalizedHeaders []string
newHeaders = http.Header{}
for k, v := range headers {
if lower := strings.ToLower(k); strings.HasPrefix(lower, headerOSSPrefix) {
newHeaders[lower] = v
canonicalizedHeaders = append(canonicalizedHeaders, lower)
} else {
newHeaders[k] = v
}
}
sort.Strings(canonicalizedHeaders)
var canonicalizedHeader string
for _, k := range canonicalizedHeaders {
v := ""
if len(headers[k]) > 0 {
v = headers[k][0]
}
canonicalizedHeader += k + ":" + v + "\n"
}
return newHeaders, canonicalizedHeader
}
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