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authorization-middleware.go
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/
authorization-middleware.go
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// Package grpc implements functions to expose user service endpoint using GRPC protocol.
package grpc
import (
"context"
userGRPCContract "github.com/decentralized-cloud/user/contract/grpc/go"
"github.com/decentralized-cloud/user/models"
"github.com/go-kit/kit/endpoint"
"github.com/lestrrat-go/jwx/jwt"
"github.com/micro-business/go-core/jwt/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type authorizeFunc func(email string, request interface{}) error
var authorizedFuncs = map[string]authorizeFunc{
"CreateUser": isAuthorizedToCallCreateUser,
"ReadUser": isAuthorizedToCallReadUser,
"UpdateUser": isAuthorizedToCallUpdateUser,
"DeleteUser": isAuthorizedToCallDeleteUser,
}
func (service *transportService) createAuthMiddleware(endpointName string) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
token, err := grpc.ParseAndVerifyToken(ctx, service.jwksURL, true)
if err != nil {
return nil, err
}
if err = service.isAuthorized(token, endpointName, request); err != nil {
return nil, err
}
parsedToken := models.ParsedToken{Email: token.PrivateClaims()["email"].(string)}
ctx = context.WithValue(ctx, models.ContextKeyParsedToken, parsedToken)
return next(ctx, request)
}
}
}
func (service *transportService) isAuthorized(token jwt.Token, endpointName string, request interface{}) error {
email := token.PrivateClaims()["email"].(string)
if len(email) == 0 {
return status.Errorf(codes.Unauthenticated, "Email address is not included in the claims")
}
return authorizedFuncs[endpointName](email, request)
}
func isAuthorizedToCallCreateUser(email string, request interface{}) error {
return nil
}
func isAuthorizedToCallReadUser(email string, request interface{}) error {
castedRequest := request.(*userGRPCContract.ReadUserRequest)
if castedRequest.Email != email {
return status.Errorf(codes.Unauthenticated, "Email address does not match the received one in the request")
}
return nil
}
func isAuthorizedToCallUpdateUser(email string, request interface{}) error {
castedRequest := request.(*userGRPCContract.UpdateUserRequest)
if castedRequest.Email != email {
return status.Errorf(codes.Unauthenticated, "Email address does not match the received one in the request")
}
return nil
}
func isAuthorizedToCallDeleteUser(email string, request interface{}) error {
castedRequest := request.(*userGRPCContract.DeleteUserRequest)
if castedRequest.Email != email {
return status.Errorf(codes.Unauthenticated, "Email address does not match the received one in the request")
}
return nil
}