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jwt.go
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jwt.go
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package internet
import (
"errors"
"fmt"
"net/http"
"strings"
"time"
"github.com/buger/jsonparser"
"github.com/dgrijalva/jwt-go"
"github.com/getblank/blank-one/sessions"
)
type blankClaims struct {
UserID interface{} `json:"userId"`
SessionID string `json:"sessionId"`
Extra map[string]interface{}
jwt.StandardClaims
}
func (b *blankClaims) toMap() map[string]interface{} {
res := map[string]interface{}{
"_id": b.UserID,
"jwtInfo": map[string]interface{}{
"userId": b.UserID,
"sessionId": b.SessionID,
"issuedAt": b.IssuedAt,
"ussiedBy": b.Issuer,
"expiredAt": b.ExpiresAt,
},
}
for k, v := range b.Extra {
res[k] = v
}
return res
}
func (b *blankClaims) UnmarshalJSON(p []byte) error {
if b.Extra == nil {
b.Extra = map[string]interface{}{}
}
err := jsonparser.ObjectEach(p, func(key []byte, value []byte, dataType jsonparser.ValueType, offset int) error {
k := string(key)
switch k {
// standard claims
case "aud":
if dataType != jsonparser.String {
return fmt.Errorf("invalid value type for key %s", k)
}
b.Audience, _ = jsonparser.ParseString(value)
case "exp":
if dataType != jsonparser.Number {
return fmt.Errorf("invalid value type for key %s", k)
}
b.ExpiresAt, _ = jsonparser.ParseInt(value)
case "jti":
if dataType != jsonparser.String {
return fmt.Errorf("invalid value type for key %s", k)
}
b.Id, _ = jsonparser.ParseString(value)
case "iat":
if dataType != jsonparser.Number {
return fmt.Errorf("invalid value type for key %s", k)
}
b.IssuedAt, _ = jsonparser.ParseInt(value)
case "iss":
if dataType != jsonparser.String {
return fmt.Errorf("invalid value type for key %s", k)
}
b.Issuer, _ = jsonparser.ParseString(value)
case "nbf":
if dataType != jsonparser.Number {
return fmt.Errorf("invalid value type for key %s", k)
}
b.NotBefore, _ = jsonparser.ParseInt(value)
case "sub":
if dataType != jsonparser.String {
return fmt.Errorf("invalid value type for key %s", k)
}
b.Subject, _ = jsonparser.ParseString(value)
// custom claims
case "sessionId":
if dataType != jsonparser.String {
return fmt.Errorf("invalid value type for key %s", k)
}
b.SessionID, _ = jsonparser.ParseString(value)
case "userId":
val, err := parseInterface(value, dataType)
if err != nil {
return err
}
b.UserID = val
default:
val, err := parseInterface(value, dataType)
if err != nil {
return err
}
b.Extra[k] = val
}
return nil
})
return err
}
func parseInterface(value []byte, dataType jsonparser.ValueType) (val interface{}, err error) {
switch dataType {
case jsonparser.String:
val, _ = jsonparser.ParseString(value)
case jsonparser.Number:
val, _ = jsonparser.ParseFloat(value)
case jsonparser.Object, jsonparser.Array:
err = json.Unmarshal(value, &val)
case jsonparser.Boolean:
val, _ = jsonparser.ParseBoolean(value)
}
return val, err
}
func jwtChecker(t *jwt.Token) (interface{}, error) {
claims, ok := t.Claims.(*blankClaims)
if !ok {
return nil, errors.New("invalid claims")
}
if !claims.VerifyIssuer("Blank ltd", true) {
return nil, errors.New("unknown issuer")
}
if !claims.VerifyExpiresAt(time.Now().Unix(), true) {
return nil, errors.New("token expired")
}
return sessions.PublicKey(), nil
}
func extractClaimsFromJWT(token string) (claims *blankClaims, err error) {
claims = new(blankClaims)
_, err = jwt.ParseWithClaims(token, claims, jwtChecker)
return claims, err
}
func extractToken(r *http.Request) string {
var accessToken string
if authHeader := r.Header.Get("Authorization"); len(authHeader) != 0 {
if strings.HasPrefix(authHeader, "Bearer ") {
return strings.TrimSpace(strings.TrimPrefix(authHeader, "Bearer "))
}
}
accessToken = r.URL.Query().Get("access_token")
if len(accessToken) == 0 {
if cookie, err := r.Cookie("access_token"); err == nil && cookie.Expires.Before(time.Now()) {
accessToken = cookie.Value
}
}
return accessToken
}