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utils.go
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/
utils.go
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package graph
import (
"context"
"errors"
"fmt"
"os"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/freexet/raven/auth"
"github.com/gin-gonic/gin"
)
func Authenticate(ctx context.Context, callback func(ctx *gin.Context, user *auth.User) (interface{}, error)) (interface{}, error) {
gc := ctx.Value(ContextKey{Name: "ginCtx"}).(*gin.Context)
authHeader := gc.Request.Header.Get("authorization")
if len(authHeader) == 0 {
return nil, errors.New("no token provided")
}
t := strings.Split(authHeader, " ")
if t[0] != "Bearer" {
return nil, errors.New("invalid token")
}
token, err := jwt.ParseWithClaims(
t[1],
&jwt.StandardClaims{},
func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
return []byte(os.Getenv("SECRET_KEY")), nil
},
)
if err != nil {
return nil, errors.New("could not parse token")
}
claims, ok := token.Claims.(*jwt.StandardClaims)
if !ok {
return nil, errors.New("unauthorized: invalid token")
}
if claims.ExpiresAt < time.Now().Local().Unix() {
return nil, errors.New("token is expired")
}
a, _ := gc.Get("auth")
user, err := a.(auth.Service).GetUserByID(claims.Id)
if err != nil {
return nil, err
}
return callback(gc, user)
}