98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
// Copyright (C) 2025 wangyusong
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero 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 Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
package rpc
|
|
|
|
import (
|
|
"context"
|
|
"encoding/json"
|
|
"errors"
|
|
"net/http"
|
|
)
|
|
|
|
type Handler[Request any, Response any] func(ctx context.Context, req *Request) (*Response, error)
|
|
|
|
var (
|
|
ErrBadRequest = func(err error) Error { return newError(http.StatusBadRequest, err) }
|
|
ErrNotFound = func(err error) Error { return newError(http.StatusNotFound, err) }
|
|
ErrInternal = func(err error) Error { return newError(http.StatusInternalServerError, err) }
|
|
)
|
|
|
|
type Error struct {
|
|
Code int `json:"code"`
|
|
Message string `json:"message"`
|
|
}
|
|
|
|
func (e Error) Error() string {
|
|
return e.Message
|
|
}
|
|
|
|
func newError(code int, err error) Error {
|
|
return Error{
|
|
Code: code,
|
|
Message: err.Error(),
|
|
}
|
|
}
|
|
|
|
func API[Request any, Response any](handler Handler[Request, Response]) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
allowCORS(w)
|
|
|
|
if r.Method == "OPTIONS" {
|
|
return
|
|
}
|
|
|
|
var req Request
|
|
if r.Body != http.NoBody {
|
|
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
|
|
http.Error(w, err.Error(), http.StatusBadRequest)
|
|
|
|
return
|
|
}
|
|
}
|
|
|
|
resp, err := handler(r.Context(), &req)
|
|
if err != nil {
|
|
var rpcErr Error
|
|
if errors.As(err, &rpcErr) {
|
|
w.Header().Set("Content-Type", "application/json")
|
|
w.WriteHeader(rpcErr.Code)
|
|
_ = json.NewEncoder(w).Encode(rpcErr)
|
|
|
|
return
|
|
}
|
|
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
|
|
w.Header().Set("Content-Type", "application/json")
|
|
if err := json.NewEncoder(w).Encode(resp); err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
})
|
|
}
|
|
|
|
func allowCORS(w http.ResponseWriter) {
|
|
w.Header().Set("Access-Control-Allow-Origin", "*")
|
|
w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
|
|
w.Header().Set("Access-Control-Allow-Headers",
|
|
"Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization",
|
|
)
|
|
}
|