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auth.go
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auth.go
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package auth
import (
"context"
"fmt"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/grpc-ecosystem/go-grpc-middleware/util/metautils"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type Auth struct {
opts *Options
}
var unauthenticatedErr = status.Errorf(codes.Unauthenticated, "Request unauthenticated")
var CTXUID = "uid"
func (a *Auth) AuthFunc(ctx context.Context) (context.Context, error) {
var (
err error
token *jwt.Token
claims = &Claims{}
)
tokenString := metautils.ExtractIncoming(ctx).Get(a.opts.HeaderAuthorize)
if tokenString == "" {
return ctx, unauthenticatedErr
}
token, err = jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
// Don't forget to validate the alg is what you expect:
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return []byte(a.opts.Secret), nil
})
if err != nil {
return ctx, unauthenticatedErr
}
if claims, ok := token.Claims.(*Claims); ok && token.Valid {
ctx = context.WithValue(ctx, CTXUID, claims.UID)
} else {
return ctx, unauthenticatedErr
}
return ctx, err
}
func (a *Auth) GenerateAuth(uid int64) (string, error) {
claims := &Claims{
UID: uid,
ExpireAt: time.Now().Add(15 * time.Minute).Unix(),
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString([]byte(a.opts.Secret))
}