kratos-utils/http/middleware/rpc_value.go

package middleware

import (
	"context"
	"encoding/json"
	"strconv"

	"google.golang.org/grpc/metadata"

	"github.com/go-kratos/kratos/v2/middleware"
)

func GrpcValue(handler middleware.Handler) middleware.Handler {
	return func(ctx context.Context, req interface{}) (reply interface{}, err error) {
		if md, ok := metadata.FromIncomingContext(ctx); ok {
			userID := md.Get("user_id")
			if len(userID) > 0 {
				_userID, _ := strconv.ParseInt(userID[0], 10, 64)
				ctx = context.WithValue(ctx, "user_id", _userID)
			}

			claimMap := md.Get("jwt_claims")
			if len(claimMap) > 0 {
				_claimMap := json.RawMessage(claimMap[0])
				ctx = context.WithValue(ctx, "jwt_claims", _claimMap)
			}
			token := md.Get("auth_token")
			if len(token) > 0 {
				ctx = context.WithValue(ctx, "auth_token", token[0])
			}

			page := md.Get("page")
			if len(page) > 0 {
				_page, _ := strconv.ParseInt(page[0], 10, 64)
				ctx = context.WithValue(ctx, "page", _page)
			}

			pageSize := md.Get("page_size")
			if len(pageSize) > 0 {
				_pageSize, _ := strconv.ParseInt(pageSize[0], 10, 64)
				ctx = context.WithValue(ctx, "page_size", _pageSize)
			}
		}
		return handler(ctx, req)
	}
}