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jws.go
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jws.go
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package dangerous
import (
"bytes"
"crypto/sha256"
"crypto/sha512"
"fmt"
"time"
)
var (
JwsAlgorithms = map[string]interface{}{
"HS256": HMACAlgorithm{DigestMethod: sha256.New},
"HS384": HMACAlgorithm{DigestMethod: sha512.New384},
"HS512": HMACAlgorithm{DigestMethod: sha512.New},
"none": SigningAlgorithm{},
}
DefaultAlgorithm = "HS512"
DefaultSerializer = JSON{}
DefaultExpiresIn int64 = 3600
)
type JSONWebSignatureSerializer struct {
Secret string
Salt string
Serializer JSONAPI
Signer Signer
AlgorithmName string
Algorithm Signature
ExpiresIn int64
}
func (jwss *JSONWebSignatureSerializer) SetDefault() {
if jwss.AlgorithmName == "" {
jwss.AlgorithmName = DefaultAlgorithm
}
if jwss.ExpiresIn == 0 {
jwss.ExpiresIn = DefaultExpiresIn
}
alg := JwsAlgorithms[jwss.AlgorithmName]
if alg == nil {
jwss.AlgorithmName = DefaultAlgorithm
alg = JwsAlgorithms[jwss.AlgorithmName]
fmt.Println("Invalid_algorithm! Now we will use default algorithm. HS256.")
}
jwss.Algorithm = alg.(Signature)
jwss.Serializer = JSON{}
}
func (jwss JSONWebSignatureSerializer) LoadPayload(payload []byte) (interface{}, interface{}, error) {
sep := []byte(".")
if !bytes.Contains(payload, sep) {
return BlankBytes, BlankBytes, fmt.Errorf("BadPayload: No '.' found in value, %s", payload)
}
v := bytes.SplitN(payload, []byte("."), 2)
base64dheader, base64dpayload := v[0], v[1]
JSONheader, err := B64decode(base64dheader)
if err != nil {
return JSONheader, BlankBytes, fmt.Errorf("Could not base64 decode the header because of an exception")
}
JSONpayload, err := B64decode(base64dpayload)
if err != nil {
return BlankBytes, JSONpayload, fmt.Errorf("Could not base64 decode the payload because of an exception")
}
header, err := jwss.Serializer.Load(JSONheader)
if err != nil {
return header, BlankBytes, fmt.Errorf("Could not unserialize header because it was malformed")
}
_, ok := header.(map[string]interface{})
if !ok {
return header, BlankBytes, fmt.Errorf("Header payload is not a JSON object")
}
payloadr, err := jwss.Serializer.Load(JSONpayload)
return header, payloadr, err
}
func (jwss JSONWebSignatureSerializer) DumpPayload(header, obj interface{}) ([]byte, error) {
h, err := jwss.Serializer.(JSONAPI).Dump(header)
if err != nil {
return BlankBytes, err
}
base64dheader := B64encode([]byte(h))
p, err := jwss.Serializer.(JSONAPI).Dump(obj)
if err != nil {
return BlankBytes, err
}
base64dpayload := B64encode([]byte(p))
sep := WantBytes(".")
result, err := Concentrate(WantBytes(base64dheader), sep, WantBytes(base64dpayload))
return result, err
}
func (jwss JSONWebSignatureSerializer) MakeSigner() Signer {
keyderivation := ""
if jwss.Salt == "" {
keyderivation = "none"
}
SIGNER := &Signer{
Secret: jwss.Secret,
Salt: jwss.Salt,
Sep: ".",
KeyDerivation: keyderivation,
Algorithm: jwss.Algorithm,
}
SIGNER.SetDefault()
return (*SIGNER)
}
func (jwss JSONWebSignatureSerializer) MakeHeader(headerfields map[string]interface{}) map[string]interface{} {
headerfields["alg"] = jwss.AlgorithmName
return headerfields
}
func (jwss JSONWebSignatureSerializer) Dumps(obj interface{}, args ...interface{}) ([]byte, error) {
(&jwss).SetDefault()
headerfields := map[string]interface{}{}
if len(args) == 1 {
headerfields, _ = args[0].(map[string]interface{})
}
header := jwss.MakeHeader(headerfields)
signer := jwss.MakeSigner()
payload, err := jwss.DumpPayload(header, obj)
if err != nil {
return payload, err
}
return signer.Sign(string(payload)), nil
}
func (jwss JSONWebSignatureSerializer) Loads(s string) (interface{}, interface{}, error) {
(&jwss).SetDefault()
signer := jwss.MakeSigner()
b, err := signer.UnSign(s)
if err != nil {
return nil, nil, err
}
h, payload, err := jwss.LoadPayload(b)
if err != nil {
return h, payload, err
}
header, _ := h.(map[string]interface{})
if header["alg"].(string) != jwss.AlgorithmName {
err = fmt.Errorf(`BadHeader: Algorithm mismatch, header:%v, payload=%v`, header, payload)
}
return header, payload, err
}
func (jwss JSONWebSignatureSerializer) TimedMakeHeader(headerfields map[string]interface{}) map[string]interface{} {
header := jwss.MakeHeader(headerfields)
iat := jwss.now()
exp := iat + jwss.ExpiresIn
header["iat"] = iat
header["exp"] = exp
return header
}
func (jwss JSONWebSignatureSerializer) TimedDumps(obj interface{}, args ...interface{}) ([]byte, error) {
(&jwss).SetDefault()
headerfields := map[string]interface{}{}
if len(args) == 1 {
headerfields, _ = args[0].(map[string]interface{})
fmt.Println("get")
}
header := jwss.TimedMakeHeader(headerfields)
return jwss.Dumps(obj, header)
}
func (jwss JSONWebSignatureSerializer) TimedLoads(s string) (map[string]interface{}, interface{}, error) {
(&jwss).SetDefault()
header, payload, err := jwss.Loads(s)
if err != nil {
return nil, payload, err
}
headers := header.(map[string]interface{})
if ok := headers["exp"]; ok == nil {
return headers, payload, fmt.Errorf("BadSignature-Missing expiry date")
}
IntDateError := fmt.Errorf(`BadHeader-Expiry date is not an IntDate, payload:%v`, payload)
expfloat, ok := headers["exp"].(float64)
if !ok {
return headers, payload, IntDateError
}
exp := int64(expfloat)
if exp < 0 {
return headers, payload, IntDateError
}
if exp < jwss.now() {
err := fmt.Errorf(`Signature expired, expired at %s`, jwss.GetIssueDate(exp))
return headers, payload, err
}
return headers, payload, nil
}
func (jwss JSONWebSignatureSerializer) now() int64 {
return time.Now().UTC().Unix()
}
func (jwss JSONWebSignatureSerializer) GetIssueDate(t int64) string {
return fmt.Sprintf("%s", time.Unix(t, 0).UTC())
}