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109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
/*
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Copyright (C) 2024 Pagefault Games
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package account
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import (
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"encoding/json"
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"errors"
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"net/http"
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"net/url"
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)
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var (
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DiscordClientID string
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DiscordClientSecret string
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DiscordCallbackURL string
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)
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func HandleDiscordCallback(w http.ResponseWriter, r *http.Request) (string, error) {
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code := r.URL.Query().Get("code")
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if code == "" {
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http.Redirect(w, r, GameURL, http.StatusSeeOther)
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return "", errors.New("code is empty")
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}
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discordId, err := RetrieveDiscordId(code)
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if err != nil {
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http.Redirect(w, r, GameURL, http.StatusSeeOther)
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return "", err
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}
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return discordId, nil
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}
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func RetrieveDiscordId(code string) (string, error) {
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v := make(url.Values)
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v.Set("client_id", DiscordClientID)
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v.Set("client_secret", DiscordClientSecret)
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v.Set("grant_type", "authorization_code")
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v.Set("code", code)
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v.Set("redirect_uri", DiscordCallbackURL)
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v.Set("scope", "identify")
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token, err := http.PostForm("https://discord.com/api/oauth2/token", v)
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if err != nil {
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return "", err
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}
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// extract access_token from token
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type TokenResponse struct {
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AccessToken string `json:"access_token"`
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TokenType string `json:"token_type"`
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ExpiresIn int `json:"expires_in"`
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Scope string `json:"scope"`
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RefreshToken string `json:"refresh_token"`
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}
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var tokenResponse TokenResponse
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err = json.NewDecoder(token.Body).Decode(&tokenResponse)
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if err != nil {
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return "", err
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}
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access_token := tokenResponse.AccessToken
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if access_token == "" {
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return "", errors.New("access token is empty")
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}
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client := &http.Client{}
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req, err := http.NewRequest("GET", "https://discord.com/api/users/@me", nil)
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if err != nil {
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return "", err
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}
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req.Header.Set("Authorization", "Bearer "+access_token)
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resp, err := client.Do(req)
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if err != nil {
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return "", err
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}
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defer resp.Body.Close()
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type User struct {
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Id string `json:"id"`
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}
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var user User
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err = json.NewDecoder(resp.Body).Decode(&user)
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if err != nil {
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return "", err
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}
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return user.Id, nil
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}
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