Implement Alibaba Cloud OSS gateway support (#5103)

vendor/github.com/aliyun/aliyun-oss-go-sdk/oss/auth.go

@@ -0,0 +1,97 @@
+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) {
+	// Get the final Authorization' string
+	authorizationStr := "OSS " + conn.config.AccessKeyID + ":" + conn.getSignedStr(req, canonicalizedResource)
+
+	// Give the parameter "Authorization" value
+	req.Header.Set(HTTPHeaderAuthorization, authorizationStr)
+}
+
+func (conn Conn) getSignedStr(req *http.Request, canonicalizedResource string) 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
+	// when sign url, date is expires
+	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))
+
+	return signedStr
+}
+
+// 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]
+}