/
common_volcengine_tos_handler.go
372 lines (315 loc) · 9.09 KB
/
common_volcengine_tos_handler.go
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package common
import (
"bytes"
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"sort"
"strings"
"time"
"github.com/volcengine/volcengine-go-sdk/volcengine"
"github.com/volcengine/volcengine-go-sdk/volcengine/client"
"github.com/volcengine/volcengine-go-sdk/volcengine/client/metadata"
"github.com/volcengine/volcengine-go-sdk/volcengine/corehandlers"
"github.com/volcengine/volcengine-go-sdk/volcengine/request"
"github.com/volcengine/volcengine-go-sdk/volcengine/volcengineerr"
)
var tosSignRequestHandler = request.NamedHandler{Name: "TosSignRequestHandler", Fn: tosSign}
var tosUnmarshalErrorHandler = request.NamedHandler{Name: "TosUnmarshalErrorHandler", Fn: tosUnmarshalError}
func (u *BypassSvc) NewTosClient(info *BypassSvcInfo) *client.Client {
svc := "tos"
config := u.Session.ClientConfig(svc)
var (
endpoint string
)
if info.Domain == "" {
if config.Config.DisableSSL != nil && *config.Config.DisableSSL {
endpoint = fmt.Sprintf("%s://tos-%s.volces.com", "http", config.SigningRegion)
} else {
endpoint = fmt.Sprintf("%s://tos-%s.volces.com", "https", config.SigningRegion)
}
} else {
if config.Config.DisableSSL != nil && *config.Config.DisableSSL {
endpoint = fmt.Sprintf("%s://%s.tos-%s.volces.com", "http", info.Domain, config.SigningRegion)
} else {
endpoint = fmt.Sprintf("%s://%s.tos-%s.volces.com", "https", info.Domain, config.SigningRegion)
}
}
c := client.New(
*config.Config,
metadata.ClientInfo{
SigningName: config.SigningName,
SigningRegion: config.SigningRegion,
Endpoint: endpoint,
ServiceName: svc,
ServiceID: svc,
},
config.Handlers,
)
c.Handlers.Build.PushBackNamed(corehandlers.SDKVersionUserAgentHandler)
c.Handlers.Build.PushBackNamed(corehandlers.AddHostExecEnvUserAgentHandler)
c.Handlers.Sign.PushBackNamed(tosSignRequestHandler)
c.Handlers.Build.PushBackNamed(bypassBuildHandler)
c.Handlers.Unmarshal.PushBackNamed(bypassUnmarshalHandler)
c.Handlers.UnmarshalError.PushBackNamed(tosUnmarshalErrorHandler)
return c
}
func tosSign(req *request.Request) {
//region := req.ClientInfo.SigningRegion
var (
c Credentials
)
region := volcengine.StringValue(req.Config.Region)
//name := req.ClientInfo.SigningName
//if name == "" {
// name = req.ClientInfo.ServiceID
//}
value, _ := req.Config.Credentials.Get()
c = Credentials{
AccessKeyID: value.AccessKeyID,
SecretAccessKey: value.SecretAccessKey,
SessionToken: value.SessionToken,
Region: region,
Service: "tos",
}
r := sign(req.HTTPRequest, c)
req.HTTPRequest.Header = r.Header
}
type tosMetadata struct {
algorithm string
credentialScope string
signedHeaders string
date string
region string
service string
}
type Credentials struct {
AccessKeyID string
SecretAccessKey string
Service string
Region string
SessionToken string
}
type tosError struct {
Code string
RequestId string
HostId string
Message string
}
func sign(request *http.Request, c Credentials) *http.Request {
query := request.URL.Query()
request.URL.RawQuery = query.Encode()
return sign4(request, c)
}
// Sign4 signs a request with Signed Signature Version 4.
func sign4(request *http.Request, credential Credentials) *http.Request {
keys := credential
prepareRequestV4(request)
meta := new(tosMetadata)
meta.service, meta.region = keys.Service, keys.Region
// Task 0 设置SessionToken的header
if credential.SessionToken != "" {
request.Header.Set("X-Tos-Security-Token", credential.SessionToken)
}
// Task 1
hashedCanonReq := hashedCanonicalRequestV4(request, meta)
// Task 2
stringToSign := stringToSignV4(request, hashedCanonReq, meta)
// Task 3
signingKey := signingKeyV4(keys.SecretAccessKey, meta.date, meta.region, meta.service)
signature := signatureV4(signingKey, stringToSign)
request.Header.Set("Authorization", buildAuthHeaderV4(signature, meta, keys))
return request
}
func hashedCanonicalRequestV4(request *http.Request, meta *tosMetadata) string {
payload := readAndReplaceBody(request)
payloadHash := hashSHA256(payload)
request.Header.Set("X-Tos-Content-Sha256", payloadHash)
request.Header.Set("Host", request.Host)
var sortedHeaderKeys []string
for key := range request.Header {
switch key {
case "Content-Type", "Content-Md5", "Host", "X-Tos-Security-Token":
default:
if !strings.HasPrefix(key, "X-") {
continue
}
}
sortedHeaderKeys = append(sortedHeaderKeys, strings.ToLower(key))
}
sort.Strings(sortedHeaderKeys)
var headersToSign string
for _, key := range sortedHeaderKeys {
value := strings.TrimSpace(request.Header.Get(key))
if key == "host" {
if strings.Contains(value, ":") {
split := strings.Split(value, ":")
port := split[1]
if port == "80" || port == "443" {
value = split[0]
}
}
}
headersToSign += key + ":" + value + "\n"
}
meta.signedHeaders = concat(";", sortedHeaderKeys...)
canonicalRequest := concat("\n", request.Method, normuri(request.URL.Path), normquery(request.URL.Query()), headersToSign, meta.signedHeaders, payloadHash)
return hashSHA256([]byte(canonicalRequest))
}
func stringToSignV4(request *http.Request, hashedCanonReq string, meta *tosMetadata) string {
requestTs := request.Header.Get("X-Tos-Date")
meta.algorithm = "TOS4-HMAC-SHA256"
meta.date = tsDateV4(requestTs)
meta.credentialScope = concat("/", meta.date, meta.region, meta.service, "request")
return concat("\n", meta.algorithm, requestTs, meta.credentialScope, hashedCanonReq)
}
func signatureV4(signingKey []byte, stringToSign string) string {
return hex.EncodeToString(hmacSHA256(signingKey, stringToSign))
}
func prepareRequestV4(request *http.Request) *http.Request {
necessaryDefaults := map[string]string{
"X-Tos-Date": timestampV4(),
}
for header, value := range necessaryDefaults {
if request.Header.Get(header) == "" {
request.Header.Set(header, value)
}
}
if request.URL.Path == "" {
request.URL.Path += "/"
}
return request
}
func signingKeyV4(secretKey, date, region, service string) []byte {
kDate := hmacSHA256([]byte(secretKey), date)
kRegion := hmacSHA256(kDate, region)
kService := hmacSHA256(kRegion, service)
kSigning := hmacSHA256(kService, "request")
return kSigning
}
func buildAuthHeaderV4(signature string, meta *tosMetadata, keys Credentials) string {
credential := keys.AccessKeyID + "/" + meta.credentialScope
return meta.algorithm +
" Credential=" + credential +
", SignedHeaders=" + meta.signedHeaders +
", Signature=" + signature
}
func timestampV4() string {
return now().Format("20060102T150405Z")
}
func tsDateV4(timestamp string) string {
return timestamp[:8]
}
func hmacSHA256(key []byte, content string) []byte {
mac := hmac.New(sha256.New, key)
mac.Write([]byte(content))
return mac.Sum(nil)
}
func hashSHA256(content []byte) string {
h := sha256.New()
h.Write(content)
return fmt.Sprintf("%x", h.Sum(nil))
}
//func hashMD5(content []byte) string {
// h := md5.New()
// h.Write(content)
// return base64.StdEncoding.EncodeToString(h.Sum(nil))
//}
func readAndReplaceBody(request *http.Request) []byte {
if request.Body == nil {
return []byte{}
}
payload, _ := ioutil.ReadAll(request.Body)
request.Body = ioutil.NopCloser(bytes.NewReader(payload))
return payload
}
func concat(delim string, str ...string) string {
return strings.Join(str, delim)
}
var now = func() time.Time {
return time.Now().UTC()
}
func normuri(uri string) string {
parts := strings.Split(uri, "/")
for i := range parts {
parts[i] = encodePathFrag(parts[i])
}
return strings.Join(parts, "/")
}
func encodePathFrag(s string) string {
hexCount := 0
for i := 0; i < len(s); i++ {
c := s[i]
if shouldEscape(c) {
hexCount++
}
}
t := make([]byte, len(s)+2*hexCount)
j := 0
for i := 0; i < len(s); i++ {
c := s[i]
if shouldEscape(c) {
t[j] = '%'
t[j+1] = "0123456789ABCDEF"[c>>4]
t[j+2] = "0123456789ABCDEF"[c&15]
j += 3
} else {
t[j] = c
j++
}
}
return string(t)
}
func shouldEscape(c byte) bool {
if 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' {
return false
}
if '0' <= c && c <= '9' {
return false
}
if c == '-' || c == '_' || c == '.' || c == '~' {
return false
}
return true
}
func normquery(v url.Values) string {
queryString := v.Encode()
return strings.Replace(queryString, "+", "%20", -1)
}
func tosUnmarshalError(r *request.Request) {
defer r.HTTPResponse.Body.Close()
if r.DataFilled() {
body, err := ioutil.ReadAll(r.HTTPResponse.Body)
if err != nil {
fmt.Printf("read volcenginebody err, %v\n", err)
r.Error = err
return
}
tos := tosError{}
if len(body) > 0 {
if err = json.Unmarshal(body, &tos); err != nil {
fmt.Printf("Unmarshal err, %v\n", err)
r.Error = err
return
}
}
r.Error = volcengineerr.NewRequestFailure(
volcengineerr.New(tos.Code, tos.Message, nil),
r.HTTPResponse.StatusCode,
tos.RequestId,
)
return
} else {
r.Error = volcengineerr.NewRequestFailure(
volcengineerr.New("ServiceUnavailableException", "service is unavailable", nil),
r.HTTPResponse.StatusCode,
r.RequestID,
)
return
}
}