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105 lines
2.6 KiB
Go

/*
Copyright (C) 2024 Pagefault Games
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 <http://www.gnu.org/licenses/>.
*/
package account
import (
"encoding/json"
"errors"
"net/http"
"net/url"
"os"
)
func HandleDiscordCallback(w http.ResponseWriter, r *http.Request) (string, error) {
code := r.URL.Query().Get("code")
gameUrl := os.Getenv("GAME_URL")
if code == "" {
defer http.Redirect(w, r, gameUrl, http.StatusSeeOther)
return "", errors.New("code is empty")
}
discordId, err := RetrieveDiscordId(code)
if err != nil {
defer http.Redirect(w, r, gameUrl, http.StatusSeeOther)
return "", err
}
return discordId, nil
}
func RetrieveDiscordId(code string) (string, error) {
token, err := http.PostForm("https://discord.com/api/oauth2/token", url.Values{
"client_id": {os.Getenv("DISCORD_CLIENT_ID")},
"client_secret": {os.Getenv("DISCORD_CLIENT_SECRET")},
"grant_type": {"authorization_code"},
"code": {code},
"redirect_uri": {os.Getenv("DISCORD_CALLBACK_URL")},
"scope": {"identify"},
})
if err != nil {
return "", err
}
// extract access_token from token
type TokenResponse struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
ExpiresIn int `json:"expires_in"`
Scope string `json:"scope"`
RefreshToken string `json:"refresh_token"`
}
var tokenResponse TokenResponse
err = json.NewDecoder(token.Body).Decode(&tokenResponse)
if err != nil {
return "", err
}
access_token := tokenResponse.AccessToken
if access_token == "" {
return "", errors.New("access token is empty")
}
client := &http.Client{}
req, err := http.NewRequest("GET", "https://discord.com/api/users/@me", nil)
if err != nil {
return "", err
}
req.Header.Set("Authorization", "Bearer "+access_token)
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
type User struct {
Id string `json:"id"`
}
var user User
err = json.NewDecoder(resp.Body).Decode(&user)
if err != nil {
return "", err
}
return user.Id, nil
}