/
Signer.go
380 lines (323 loc) · 9.07 KB
/
Signer.go
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// Copyright 2018-2025 JDCLOUD.COM
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This signer is modified from AWS V4 signer algorithm.
package core
import (
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"net/http"
"net/url"
"sort"
"strings"
"time"
"bytes"
"github.com/gofrs/uuid"
)
const (
authHeaderPrefix = "JDCLOUD2-HMAC-SHA256"
timeFormat = "20060102T150405Z"
shortTimeFormat = "20060102"
// emptyStringSHA256 is a SHA256 of an empty string
emptyStringSHA256 = `e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855`
)
var ignoredHeaders = []string {"Authorization", "User-Agent", "X-Jdcloud-Request-Id"}
var noEscape [256]bool
func init() {
for i := 0; i < len(noEscape); i++ {
// expects every character except these to be escaped
noEscape[i] = (i >= 'A' && i <= 'Z') ||
(i >= 'a' && i <= 'z') ||
(i >= '0' && i <= '9') ||
i == '-' ||
i == '.' ||
i == '_' ||
i == '~'
}
}
type Signer struct {
Credentials Credential
Logger Logger
}
func NewSigner(credsProvider Credential, logger Logger) *Signer {
return &Signer{
Credentials: credsProvider,
Logger: logger,
}
}
type signingCtx struct {
ServiceName string
Region string
Request *http.Request
Body io.ReadSeeker
Query url.Values
Time time.Time
ExpireTime time.Duration
SignedHeaderVals http.Header
credValues Credential
formattedTime string
formattedShortTime string
bodyDigest string
signedHeaders string
canonicalHeaders string
canonicalString string
credentialString string
stringToSign string
signature string
authorization string
}
// Sign signs the request by using AWS V4 signer algorithm, and adds Authorization header
func (v4 Signer) Sign(r *http.Request, body io.ReadSeeker, service, region string, signTime time.Time) (http.Header, error) {
return v4.signWithBody(r, body, service, region, 0, signTime)
}
func (v4 Signer) signWithBody(r *http.Request, body io.ReadSeeker, service, region string, exp time.Duration,
signTime time.Time) (http.Header, error) {
ctx := &signingCtx{
Request: r,
Body: body,
Query: r.URL.Query(),
Time: signTime,
ExpireTime: exp,
ServiceName: service,
Region: region,
}
for key := range ctx.Query {
sort.Strings(ctx.Query[key])
}
if ctx.isRequestSigned() {
ctx.Time = time.Now()
}
ctx.credValues = v4.Credentials
ctx.build()
v4.logSigningInfo(ctx)
return ctx.SignedHeaderVals, nil
}
const logSignInfoMsg = `DEBUG: Request Signature:
---[ CANONICAL STRING ]-----------------------------
%s
---[ STRING TO SIGN ]--------------------------------
%s%s
-----------------------------------------------------`
func (v4 *Signer) logSigningInfo(ctx *signingCtx) {
signedURLMsg := ""
msg := fmt.Sprintf(logSignInfoMsg, ctx.canonicalString, ctx.stringToSign, signedURLMsg)
v4.Logger.Log(LogInfo, msg)
}
func (ctx *signingCtx) build() {
ctx.buildTime() // no depends
ctx.buildNonce() // no depends
ctx.buildCredentialString() // no depends
ctx.buildBodyDigest()
unsignedHeaders := ctx.Request.Header
ctx.buildCanonicalHeaders(unsignedHeaders)
ctx.buildCanonicalString() // depends on canon headers / signed headers
ctx.buildStringToSign() // depends on canon string
ctx.buildSignature() // depends on string to sign
parts := []string{
authHeaderPrefix + " Credential=" + ctx.credValues.AccessKey + "/" + ctx.credentialString,
"SignedHeaders=" + ctx.signedHeaders,
"Signature=" + ctx.signature,
}
ctx.Request.Header.Set("Authorization", strings.Join(parts, ", "))
}
func (ctx *signingCtx) buildTime() {
ctx.formattedTime = ctx.Time.UTC().Format(timeFormat)
ctx.formattedShortTime = ctx.Time.UTC().Format(shortTimeFormat)
ctx.Request.Header.Set("x-jdcloud-date", ctx.formattedTime)
}
func (ctx *signingCtx) buildNonce() {
nonce, _ := uuid.NewV4()
ctx.Request.Header.Set("x-jdcloud-nonce", nonce.String())
}
func (ctx *signingCtx) buildCredentialString() {
ctx.credentialString = strings.Join([]string{
ctx.formattedShortTime,
ctx.Region,
ctx.ServiceName,
"jdcloud2_request",
}, "/")
}
func (ctx *signingCtx) buildCanonicalHeaders(header http.Header) {
var headers []string
headers = append(headers, "host")
for k, v := range header {
canonicalKey := http.CanonicalHeaderKey(k)
if shouldIgnore(canonicalKey, ignoredHeaders) {
continue // ignored header
}
if ctx.SignedHeaderVals == nil {
ctx.SignedHeaderVals = make(http.Header)
}
lowerCaseKey := strings.ToLower(k)
if _, ok := ctx.SignedHeaderVals[lowerCaseKey]; ok {
// include additional values
ctx.SignedHeaderVals[lowerCaseKey] = append(ctx.SignedHeaderVals[lowerCaseKey], v...)
continue
}
headers = append(headers, lowerCaseKey)
ctx.SignedHeaderVals[lowerCaseKey] = v
}
sort.Strings(headers)
ctx.signedHeaders = strings.Join(headers, ";")
headerValues := make([]string, len(headers))
for i, k := range headers {
if k == "host" {
if ctx.Request.Host != "" {
headerValues[i] = "host:" + ctx.Request.Host
} else {
headerValues[i] = "host:" + ctx.Request.URL.Host
}
} else {
headerValues[i] = k + ":" +
strings.Join(ctx.SignedHeaderVals[k], ",")
}
}
stripExcessSpaces(headerValues)
ctx.canonicalHeaders = strings.Join(headerValues, "\n")
}
func (ctx *signingCtx) buildCanonicalString() {
uri := getURIPath(ctx.Request.URL)
ctx.canonicalString = strings.Join([]string{
ctx.Request.Method,
uri,
ctx.Request.URL.RawQuery,
ctx.canonicalHeaders + "\n",
ctx.signedHeaders,
ctx.bodyDigest,
}, "\n")
}
func (ctx *signingCtx) buildStringToSign() {
ctx.stringToSign = strings.Join([]string{
authHeaderPrefix,
ctx.formattedTime,
ctx.credentialString,
hex.EncodeToString(makeSha256([]byte(ctx.canonicalString))),
}, "\n")
}
func (ctx *signingCtx) buildSignature() {
secret := ctx.credValues.SecretKey
date := makeHmac([]byte("JDCLOUD2"+secret), []byte(ctx.formattedShortTime))
region := makeHmac(date, []byte(ctx.Region))
service := makeHmac(region, []byte(ctx.ServiceName))
credentials := makeHmac(service, []byte("jdcloud2_request"))
signature := makeHmac(credentials, []byte(ctx.stringToSign))
ctx.signature = hex.EncodeToString(signature)
}
func (ctx *signingCtx) buildBodyDigest() {
var hash string
if ctx.Body == nil {
hash = emptyStringSHA256
} else {
hash = hex.EncodeToString(makeSha256Reader(ctx.Body))
}
ctx.bodyDigest = hash
}
// isRequestSigned returns if the request is currently signed or presigned
func (ctx *signingCtx) isRequestSigned() bool {
if ctx.Request.Header.Get("Authorization") != "" {
return true
}
return false
}
func makeHmac(key []byte, data []byte) []byte {
hash := hmac.New(sha256.New, key)
hash.Write(data)
return hash.Sum(nil)
}
func makeSha256(data []byte) []byte {
hash := sha256.New()
hash.Write(data)
return hash.Sum(nil)
}
func makeSha256Reader(reader io.ReadSeeker) []byte {
hash := sha256.New()
start, _ := reader.Seek(0, 1)
defer reader.Seek(start, 0)
io.Copy(hash, reader)
return hash.Sum(nil)
}
const doubleSpace = " "
// stripExcessSpaces will rewrite the passed in slice's string values to not
// contain muliple side-by-side spaces.
func stripExcessSpaces(vals []string) {
var j, k, l, m, spaces int
for i, str := range vals {
// Trim trailing spaces
for j = len(str) - 1; j >= 0 && str[j] == ' '; j-- {
}
// Trim leading spaces
for k = 0; k < j && str[k] == ' '; k++ {
}
str = str[k : j+1]
// Strip multiple spaces.
j = strings.Index(str, doubleSpace)
if j < 0 {
vals[i] = str
continue
}
buf := []byte(str)
for k, m, l = j, j, len(buf); k < l; k++ {
if buf[k] == ' ' {
if spaces == 0 {
// First space.
buf[m] = buf[k]
m++
}
spaces++
} else {
// End of multiple spaces.
spaces = 0
buf[m] = buf[k]
m++
}
}
vals[i] = string(buf[:m])
}
}
func getURIPath(u *url.URL) string {
var uri string
if len(u.Opaque) > 0 {
uri = "/" + strings.Join(strings.Split(u.Opaque, "/")[3:], "/")
} else {
uri = u.EscapedPath()
}
if len(uri) == 0 {
uri = "/"
}
return uri
}
func shouldIgnore(header string, ignoreHeaders []string) bool {
for _, v := range ignoreHeaders {
if v == header {
return true
}
}
return false
}
// EscapePath escapes part of a URL path
func EscapePath(path string, encodeSep bool) string {
var buf bytes.Buffer
for i := 0; i < len(path); i++ {
c := path[i]
if noEscape[c] || (c == '/' && !encodeSep) {
buf.WriteByte(c)
} else {
fmt.Fprintf(&buf, "%%%02X", c)
}
}
return buf.String()
}