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//Package middleware provides middlewares for rpc server
//
//Copyright (C) 2022 Alexander Kiryukhin <i@neonxp.dev>
//
//This file is part of neonxp.ru/go/jsonrpc2 project.
//
//This program is free software: you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program. If not, see <https://www.gnu.org/licenses/>.
package middleware
import (
"context"
"encoding/json"
"fmt"
"strings"
"github.com/qri-io/jsonschema"
"neonxp.ru/go/jsonrpc2/rpc"
)
type ServiceSchema map[string]MethodSchema
func MustSchema(schema string) ServiceSchema {
ss := new(ServiceSchema)
if err := json.Unmarshal([]byte(schema), ss); err != nil {
panic(err)
}
return *ss
}
type MethodSchema struct {
Request *jsonschema.Schema `json:"request"`
Response *jsonschema.Schema `json:"response"`
}
func Validation(serviceSchema ServiceSchema) (rpc.Middleware, error) {
return func(handler rpc.RpcHandler) rpc.RpcHandler {
return func(ctx context.Context, req *rpc.RpcRequest) *rpc.RpcResponse {
rs, hasSchema := serviceSchema[strings.ToLower(req.Method)]
if hasSchema && rs.Request != nil {
if errResp := formatError(ctx, req.Id, *rs.Request, req.Params); errResp != nil {
return errResp
}
}
resp := handler(ctx, req)
if hasSchema && rs.Response != nil {
if errResp := formatError(ctx, req.Id, *rs.Response, resp.Result); errResp != nil {
return errResp
}
}
return resp
}
}, nil
}
func formatError(ctx context.Context, requestId any, schema jsonschema.Schema, data json.RawMessage) *rpc.RpcResponse {
errs, err := schema.ValidateBytes(ctx, data)
if err != nil {
return rpc.ErrorResponse(requestId, err)
}
if errs != nil && len(errs) > 0 {
messages := []string{}
for _, msg := range errs {
messages = append(messages, fmt.Sprintf("%s: %s", msg.PropertyPath, msg.Message))
}
return rpc.ErrorResponse(requestId, rpc.Error{
Code: rpc.ErrCodeInvalidParams,
Message: strings.Join(messages, "\n"),
})
}
return nil
}
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