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/*
maltoken - A go package for the MyAnimeList OAuth mechanism
Copyright © 2023 Vidhu Kant Sharma <vidhukant@vidhukant.com>
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 <http://www.gnu.org/licenses/>.
*/
package maltoken
import (
"context"
"encoding/json"
"errors"
"fmt"
"html"
"math/rand"
"net/http"
"net/url"
"strings"
"time"
)
var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
var SuccessHTML = "<p>Success! You may close this tab now.</p>"
var BadRequestHTML = "<p>Invalid request.</p>"
var ErrHTML = "<p>MyAnimeList responded with an error: %s</p>"
func codeChallenge() string {
rand.Seed(time.Now().UnixNano())
b := make([]rune, 128)
for i := range b {
b[i] = letterRunes[rand.Intn(len(letterRunes))]
}
return string(b)
}
func GetChallengeLink(clientId string) (string, string) {
challenge := codeChallenge()
return challenge, "https://myanimelist.net/v1/oauth2/authorize?response_type=code&client_id=" + clientId + "&code_challenge=" + challenge
}
func Listen(clientId, verifier string, port int) (map[string]interface{}, error) {
var res map[string]interface{}
var e error
mux := http.NewServeMux()
server := &http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: mux,
}
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
code, codeExists := r.URL.Query()["code"]
if !codeExists {
fmt.Fprintf(w, BadRequestHTML)
return
}
resp, err := http.PostForm("https://myanimelist.net/v1/oauth2/token", url.Values {
"client_id": {clientId},
"code_verifier": {verifier},
"grant_type": {"authorization_code"},
"code": {code[0]},
})
if err != nil {
// error while making post request
e = err
go server.Shutdown(context.Background())
return
}
json.NewDecoder(resp.Body).Decode(&res)
if res["error"] != nil {
// MyAnimeList returned error
errMsg := fmt.Sprintf("%v (%v)", res["message"], res["error"])
e = errors.New(errMsg)
if strings.Contains(ErrHTML, "%s") {
fmt.Fprintf(w, ErrHTML, html.EscapeString(errMsg))
} else {
fmt.Fprintf(w, ErrHTML)
}
go server.Shutdown(context.Background())
return
}
fmt.Fprintf(w, SuccessHTML)
go server.Shutdown(context.Background())
})
err := server.ListenAndServe()
if err != nil && err != http.ErrServerClosed {
e = err
}
return res, e
}
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