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package oss
import (
"bytes"
"crypto/hmac"
"crypto/sha1"
"encoding/base64"
"hash"
"io"
"net/http"
"sort"
"strings"
)
// 用于signHeader的字典排序存放容器。
type headerSorter struct {
Keys []string
Vals []string
}
// 生成签名方法（直接设置请求的Header）。
func (conn Conn) signHeader(req *http.Request, canonicalizedResource string) {
// Find out the "x-oss-"'s address in this request'header
temp := make(map[string]string)
for k, v := range req.Header {
if strings.HasPrefix(strings.ToLower(k), "x-oss-") {
temp[strings.ToLower(k)] = v[0]
}
}
hs := newHeaderSorter(temp)
// Sort the temp by the Ascending Order
hs.Sort()
// Get the CanonicalizedOSSHeaders
canonicalizedOSSHeaders := ""
for i := range hs.Keys {
canonicalizedOSSHeaders += hs.Keys[i] + ":" + hs.Vals[i] + "\n"
}
// Give other parameters values
date := req.Header.Get(HTTPHeaderDate)
contentType := req.Header.Get(HTTPHeaderContentType)
contentMd5 := req.Header.Get(HTTPHeaderContentMD5)
signStr := req.Method + "\n" + contentMd5 + "\n" + contentType + "\n" + date + "\n" + canonicalizedOSSHeaders + canonicalizedResource
h := hmac.New(func() hash.Hash { return sha1.New() }, []byte(conn.config.AccessKeySecret))
io.WriteString(h, signStr)
signedStr := base64.StdEncoding.EncodeToString(h.Sum(nil))
// Get the final Authorization' string
authorizationStr := "OSS " + conn.config.AccessKeyID + ":" + signedStr
// Give the parameter "Authorization" value
req.Header.Set(HTTPHeaderAuthorization, authorizationStr)
}
// Additional function for function SignHeader.
func newHeaderSorter(m map[string]string) *headerSorter {
hs := &headerSorter{
Keys: make([]string, 0, len(m)),
Vals: make([]string, 0, len(m)),
}
for k, v := range m {
hs.Keys = append(hs.Keys, k)
hs.Vals = append(hs.Vals, v)
}
return hs
}
// Additional function for function SignHeader.
func (hs *headerSorter) Sort() {
sort.Sort(hs)
}
// Additional function for function SignHeader.
func (hs *headerSorter) Len() int {
return len(hs.Vals)
}
// Additional function for function SignHeader.
func (hs *headerSorter) Less(i, j int) bool {
return bytes.Compare([]byte(hs.Keys[i]), []byte(hs.Keys[j])) < 0
}
// Additional function for function SignHeader.
func (hs *headerSorter) Swap(i, j int) {
hs.Vals[i], hs.Vals[j] = hs.Vals[j], hs.Vals[i]
hs.Keys[i], hs.Keys[j] = hs.Keys[j], hs.Keys[i]
}
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