/
jwt.go
70 lines (54 loc) · 1.37 KB
/
jwt.go
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package auth
import (
"context"
"fmt"
"net/http"
jwt "github.com/dgrijalva/jwt-go"
"github.com/dosco/graphjin/serv/internal/auth/provider"
)
const (
authHeader = "Authorization"
)
func JwtHandler(ac *Auth, next http.Handler) (handlerFunc, error) {
jwtProvider, err := provider.NewProvider(ac.JWT)
if err != nil {
return nil, err
}
cookie := ac.Cookie
return func(w http.ResponseWriter, r *http.Request) (context.Context, error) {
var tok string
if cookie != "" {
ck, err := r.Cookie(cookie)
if err != nil {
return nil, err
}
tok = ck.Value
} else {
ah := r.Header.Get(authHeader)
if len(ah) < 10 {
return nil, fmt.Errorf("invalid or missing header: %s", authHeader)
}
tok = ah[7:]
}
if tok == "" {
return nil, fmt.Errorf("jwt not found")
}
keyFunc := jwtProvider.KeyFunc()
token, err := jwt.ParseWithClaims(tok, jwt.MapClaims{}, keyFunc) //jwt.MapClaims is already passed by reference
if err != nil {
return nil, err
}
if claims, ok := token.Claims.(jwt.MapClaims); ok {
ctx := r.Context()
if !jwtProvider.VerifyAudience(claims) {
return nil, fmt.Errorf("invalid aud claim")
}
if !jwtProvider.VerifyIssuer(claims) {
return nil, fmt.Errorf("invalid iss claim")
}
ctx, err = jwtProvider.SetContextValues(ctx, claims)
return ctx, err
}
return nil, fmt.Errorf("invalid claims")
}, nil
}