98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
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package oss
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import (
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"bytes"
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"crypto/hmac"
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"crypto/sha1"
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"encoding/base64"
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"hash"
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"io"
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"net/http"
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"sort"
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"strings"
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)
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// headerSorter defines the key-value structure for storing the sorted data in signHeader.
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type headerSorter struct {
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Keys []string
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Vals []string
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}
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// signHeader signs the header and sets it as the authorization header.
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func (conn Conn) signHeader(req *http.Request, canonicalizedResource string) {
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// Get the final authorization string
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authorizationStr := "OSS " + conn.config.AccessKeyID + ":" + conn.getSignedStr(req, canonicalizedResource)
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// Give the parameter "Authorization" value
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req.Header.Set(HTTPHeaderAuthorization, authorizationStr)
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}
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func (conn Conn) getSignedStr(req *http.Request, canonicalizedResource string) string {
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// Find out the "x-oss-"'s address in header of the request
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temp := make(map[string]string)
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for k, v := range req.Header {
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if strings.HasPrefix(strings.ToLower(k), "x-oss-") {
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temp[strings.ToLower(k)] = v[0]
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}
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}
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hs := newHeaderSorter(temp)
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// Sort the temp by the ascending order
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hs.Sort()
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// Get the canonicalizedOSSHeaders
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canonicalizedOSSHeaders := ""
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for i := range hs.Keys {
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canonicalizedOSSHeaders += hs.Keys[i] + ":" + hs.Vals[i] + "\n"
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}
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// Give other parameters values
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// when sign URL, date is expires
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date := req.Header.Get(HTTPHeaderDate)
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contentType := req.Header.Get(HTTPHeaderContentType)
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contentMd5 := req.Header.Get(HTTPHeaderContentMD5)
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signStr := req.Method + "\n" + contentMd5 + "\n" + contentType + "\n" + date + "\n" + canonicalizedOSSHeaders + canonicalizedResource
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h := hmac.New(func() hash.Hash { return sha1.New() }, []byte(conn.config.AccessKeySecret))
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io.WriteString(h, signStr)
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signedStr := base64.StdEncoding.EncodeToString(h.Sum(nil))
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return signedStr
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}
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// newHeaderSorter is an additional function for function SignHeader.
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func newHeaderSorter(m map[string]string) *headerSorter {
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hs := &headerSorter{
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Keys: make([]string, 0, len(m)),
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Vals: make([]string, 0, len(m)),
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}
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for k, v := range m {
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hs.Keys = append(hs.Keys, k)
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hs.Vals = append(hs.Vals, v)
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}
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return hs
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}
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// Sort is an additional function for function SignHeader.
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func (hs *headerSorter) Sort() {
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sort.Sort(hs)
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}
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// Len is an additional function for function SignHeader.
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func (hs *headerSorter) Len() int {
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return len(hs.Vals)
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}
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// Less is an additional function for function SignHeader.
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func (hs *headerSorter) Less(i, j int) bool {
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return bytes.Compare([]byte(hs.Keys[i]), []byte(hs.Keys[j])) < 0
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}
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// Swap is an additional function for function SignHeader.
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func (hs *headerSorter) Swap(i, j int) {
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hs.Vals[i], hs.Vals[j] = hs.Vals[j], hs.Vals[i]
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hs.Keys[i], hs.Keys[j] = hs.Keys[j], hs.Keys[i]
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}
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