/
signer.go
246 lines (211 loc) · 6.03 KB
/
signer.go
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// HWS API Gateway Signature
// based on https://github.com/datastream/aws/blob/master/signv4.go
// Copyright (c) 2014, Xianjie
// All rights reserved.
package iam
import (
"crypto/hmac"
"crypto/sha256"
"fmt"
"net/url"
"reflect"
"sort"
"strings"
"time"
)
const (
BasicDateFormat = "20060102T150405Z"
Algorithm = "SDK-HMAC-SHA256"
HeaderXDate = "X-Sdk-Date"
HeaderHost = "host"
HeaderAuthorization = "Authorization"
HeaderContentSha256 = "X-Sdk-Content-Sha256"
)
func hmacsha256(key []byte, data string) ([]byte, error) {
h := hmac.New(sha256.New, key)
if _, err := h.Write([]byte(data)); err != nil {
return nil, err
}
return h.Sum(nil), nil
}
func CanonicalRequest(r *DefaultHttpRequest, signedHeaders []string) (string, error) {
var hexEncode string
userHeaders := r.HeaderParams
if hex, ok := userHeaders[HeaderContentSha256]; ok {
hexEncode = hex
} else {
var err error
hexEncode, err = HexEncodeSHA256Hash(r.Body)
if err != nil {
return "", err
}
}
return fmt.Sprintf("%s\n%s\n%s\n%s\n%s\n%s",
r.Method,
CanonicalURI(r),
CanonicalQueryString(r),
CanonicalHeaders(r, signedHeaders),
strings.Join(signedHeaders, ";"), hexEncode), nil
}
// CanonicalURI returns request uri
func CanonicalURI(r *DefaultHttpRequest) string {
pattens := strings.Split(r.Path, "/")
var uri []string
for _, v := range pattens {
uri = append(uri, escape(v))
}
urlPath := strings.Join(uri, "/")
if len(urlPath) == 0 || urlPath[len(urlPath)-1] != '/' {
urlPath = urlPath + "/"
}
return urlPath
}
// CanonicalQueryString
func CanonicalQueryString(r *DefaultHttpRequest) string {
var query = make(map[string][]string, 0)
for key, value := range r.QueryParams {
valueWithType, ok := value.(reflect.Value)
if !ok {
continue
}
if valueWithType.Kind() == reflect.Slice {
params := r.CanonicalSliceQueryParamsToMulti(valueWithType)
for _, param := range params {
if _, ok := query[key]; !ok {
query[key] = make([]string, 0)
}
query[key] = append(query[key], param)
}
} else if valueWithType.Kind() == reflect.Map {
params := r.CanonicalMapQueryParams(key, valueWithType)
for _, param := range params {
for k, v := range param {
if _, ok := query[k]; !ok {
query[k] = make([]string, 0)
}
query[k] = append(query[k], v)
}
}
} else {
if _, ok := query[key]; !ok {
query[key] = make([]string, 0)
}
query[key] = append(query[key], fmt.Sprintf("%v", valueWithType))
}
}
var keys []string
for key := range query {
keys = append(keys, key)
}
sort.Strings(keys)
var a []string
for _, key := range keys {
k := escape(key)
sort.Strings(query[key])
for _, v := range query[key] {
kv := fmt.Sprintf("%s=%s", k, escape(v))
a = append(a, kv)
}
}
queryStr := strings.Join(a, "&")
return queryStr
}
// CanonicalHeaders
func CanonicalHeaders(r *DefaultHttpRequest, signerHeaders []string) string {
var a []string
header := make(map[string][]string)
userHeaders := r.HeaderParams
for k, v := range userHeaders {
if _, ok := header[strings.ToLower(k)]; !ok {
header[strings.ToLower(k)] = make([]string, 0)
}
header[strings.ToLower(k)] = append(header[strings.ToLower(k)], v)
}
for _, key := range signerHeaders {
value := header[key]
if strings.EqualFold(key, HeaderHost) {
if u, err := url.Parse(r.Endpoint); err == nil {
header[HeaderHost] = []string{u.Host}
}
}
sort.Strings(value)
for _, v := range value {
a = append(a, key+":"+strings.TrimSpace(v))
}
}
return fmt.Sprintf("%s\n", strings.Join(a, "\n"))
}
// SignedHeaders
func SignedHeaders(headers map[string]string) []string {
var signedHeaders []string
for key := range headers {
if strings.HasPrefix(strings.ToLower(key), "content-type") {
continue
}
signedHeaders = append(signedHeaders, strings.ToLower(key))
}
sort.Strings(signedHeaders)
return signedHeaders
}
// Create a "String to Sign".
func StringToSign(canonicalRequest string, t time.Time) (string, error) {
hash := sha256.New()
_, err := hash.Write([]byte(canonicalRequest))
if err != nil {
return "", err
}
return fmt.Sprintf("%s\n%s\n%x",
Algorithm, t.UTC().Format(BasicDateFormat), hash.Sum(nil)), nil
}
// Create the HWS Signature.
func SignStringToSign(stringToSign string, signingKey []byte) (string, error) {
hm, err := hmacsha256(signingKey, stringToSign)
return fmt.Sprintf("%x", hm), err
}
// HexEncodeSHA256Hash returns hexcode of sha256
func HexEncodeSHA256Hash(body []byte) (string, error) {
hash := sha256.New()
_, err := hash.Write(body)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", hash.Sum(nil)), nil
}
// Get the finalized value for the "Authorization" header. The signature parameter is the output from SignStringToSign
func AuthHeaderValue(signature, accessKey string, signedHeaders []string) string {
return fmt.Sprintf("%s Access=%s, SignedHeaders=%s, Signature=%s", Algorithm, accessKey, strings.Join(signedHeaders, ";"), signature)
}
// SignRequest set Authorization header
func Sign(r *DefaultHttpRequest, ak string, sk string) (map[string]string, error) {
var err error
var t time.Time
var headerParams = make(map[string]string)
userHeaders := r.HeaderParams
if date, ok := userHeaders[HeaderXDate]; ok {
t, err = time.Parse(BasicDateFormat, date)
if date == "" || err != nil {
t = time.Now()
userHeaders[HeaderXDate] = t.UTC().Format(BasicDateFormat)
headerParams[HeaderXDate] = t.UTC().Format(BasicDateFormat)
}
} else {
t = time.Now()
userHeaders[HeaderXDate] = t.UTC().Format(BasicDateFormat)
headerParams[HeaderXDate] = t.UTC().Format(BasicDateFormat)
}
signedHeaders := SignedHeaders(userHeaders)
canonicalRequest, err := CanonicalRequest(r, signedHeaders)
if err != nil {
return nil, err
}
stringToSign, err := StringToSign(canonicalRequest, t)
if err != nil {
return nil, err
}
signature, err := SignStringToSign(stringToSign, []byte(sk))
if err != nil {
return nil, err
}
headerParams[HeaderAuthorization] = AuthHeaderValue(signature, ak, signedHeaders)
return headerParams, nil
}