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//
// dolmetschctl
//
//
// Copyright (C) 2019 Christian Pointner <equinox@spreadspace.org>
//
// This file is part of dolmetschctl.
//
// dolmetschctl 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
// any later version.
//
// dolmetschctl 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 dolmetschctl. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"encoding/json"
"log"
"net/http"
"time"
)
type WebInterface struct {
server *http.Server
}
type webHandler struct {
sm *StateMachine
H func(*StateMachine, http.ResponseWriter, *http.Request)
}
func (self webHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
self.H(self.sm, w, r)
}
func webSendResponse(w http.ResponseWriter, status int, respdata interface{}) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(status)
encoder := json.NewEncoder(w)
encoder.Encode(respdata)
}
type webError struct {
ResponseCode int `json:"response-code"`
Error string `json:"error"`
}
func webSendErrorResponse(w http.ResponseWriter, status int, error string) {
webSendResponse(w, status, webError{ResponseCode: status, Error: error})
}
type webLanguage struct {
Lang Language `json:"language"`
}
func webLanguageHandler(sm *StateMachine, w http.ResponseWriter, r *http.Request) {
if r.Method != "PUT" {
webSendErrorResponse(w, http.StatusMethodNotAllowed, "only PUT method is allowed")
return
}
var result webLanguage
dec := json.NewDecoder(r.Body)
dec.DisallowUnknownFields()
if err := dec.Decode(&result); err != nil {
webSendErrorResponse(w, http.StatusBadRequest, err.Error())
return
}
log.Printf("web: got request %v", result)
if err := sm.SetLanguage(result.Lang); err != nil {
webSendErrorResponse(w, http.StatusBadRequest, err.Error())
return
}
webSendResponse(w, http.StatusOK, result)
}
type webState struct {
State State `json:"state"`
Ratio float32 `json:"original-to-interpreter-ratio"`
Lang Language `json:"language"`
}
func webStateHandler(sm *StateMachine, w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
webSendErrorResponse(w, http.StatusMethodNotAllowed, "only GET method is allowed")
return
}
var result webState
result.State, result.Ratio, result.Lang = sm.GetState()
webSendResponse(w, http.StatusOK, result)
}
func (web *WebInterface) Run() error {
return web.server.ListenAndServe()
}
func NewWebInterface(addr string, sm *StateMachine) (web *WebInterface, err error) {
web = &WebInterface{}
http.Handle("/api/v1/state", webHandler{sm, webStateHandler})
http.Handle("/api/v1/language", webHandler{sm, webLanguageHandler})
web.server = &http.Server{Addr: addr, ReadTimeout: 2 * time.Hour, WriteTimeout: 2 * time.Hour}
return
}
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