gtranslate/main.go

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// gtranslate - Better front-end for Google Translate
// Copyright (C) 2021-present Alexey Yerin
//
// 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 main
import (
"fmt"
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"html/template"
"log"
"net/http"
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"net/url"
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"path"
"github.com/gorilla/mux"
"github.com/spf13/pflag"
)
func main() {
bind := pflag.StringP("bind", "b", ":5000", "Address to bind the server to, [addr]:port")
templateDir := pflag.String("template-dir", "./templates", "Templates directory")
staticDir := pflag.String("static-dir", "./static", "Static files directory")
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proxy := pflag.String("proxy", "", "Proxy URL, with no scheme http is assumed")
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userAgent := pflag.String("user-agent", "", "User-Agent header to use")
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pflag.Parse()
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var proxyUrl *url.URL
if *proxy != "" {
u, err := url.Parse(*proxy)
if err != nil {
log.Fatalln("Invalid proxy URL:", err)
}
proxyUrl = u
}
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tmpl := template.Must(template.ParseGlob(path.Join(*templateDir, "*.html")))
r := mux.NewRouter()
r.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
if req.Method == "GET" {
tmpl.ExecuteTemplate(w, "index", nil)
return
}
from := req.FormValue("from")
to := req.FormValue("to")
text := req.FormValue("text")
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translation, err := Translate(from, to, text, *userAgent, proxyUrl)
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if err != nil {
writeError(w, 500, err)
}
type indexPageData struct {
From string
To string
Text string
Translation string
}
tmpl.ExecuteTemplate(w, "index", indexPageData{from, to, text, translation})
}).Methods("GET", "POST")
r.HandleFunc("/api", func(w http.ResponseWriter, req *http.Request) {
from := req.FormValue("from")
if from == "" {
writeError(w, 400, "'from' field is missing")
return
}
to := req.FormValue("to")
if to == "" {
writeError(w, 400, "'to' field is missing")
return
}
text := req.FormValue("text")
if text == "" {
writeError(w, 400, "'text' field is missing")
return
}
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translation, err := Translate(from, to, text, *userAgent, proxyUrl)
if err != nil {
writeError(w, 500, err)
}
w.Write([]byte(translation))
}).Methods("POST")
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// Static files
fs := http.FileServer(http.Dir(*staticDir))
r.PathPrefix("/static/").Handler(http.StripPrefix("/static/", fs))
log.Println("Starting on", *bind)
log.Fatalln(http.ListenAndServe(*bind, r))
}
func writeError(w http.ResponseWriter, status int, err interface{}) {
w.WriteHeader(status)
w.Write([]byte(fmt.Sprintln(err)))
}