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3.4 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"
"github.com/bwmarrin/discordgo"
)
var (
DiscordClientID string
DiscordClientSecret string
DiscordCallbackURL string
DiscordSession *discordgo.Session
DiscordGuildID string
)
func HandleDiscordCallback(w http.ResponseWriter, r *http.Request) (string, error) {
code := r.URL.Query().Get("code")
if code == "" {
http.Redirect(w, r, GameURL, http.StatusSeeOther)
return "", errors.New("code is empty")
}
discordId, err := RetrieveDiscordId(code)
if err != nil {
http.Redirect(w, r, GameURL, http.StatusSeeOther)
return "", err
}
return discordId, nil
}
func RetrieveDiscordId(code string) (string, error) {
v := make(url.Values)
v.Set("client_id", DiscordClientID)
v.Set("client_secret", DiscordClientSecret)
v.Set("grant_type", "authorization_code")
v.Set("code", code)
v.Set("redirect_uri", DiscordCallbackURL)
v.Set("scope", "identify")
token, err := http.PostForm("https://discord.com/api/oauth2/token", v)
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
}
func IsUserDiscordAdmin(discordId string, discordGuildID string) (bool, error) {
// fetch all roles from discord
roles, err := DiscordSession.GuildRoles(discordGuildID)
if err != nil {
return false, err
}
// fetch all roles from user
userRoles, err := DiscordSession.GuildMember(discordGuildID, discordId)
if err != nil {
return false, err
}
// check if user has a "Dev" or a "Division Heads" role
var hasRole bool
for _, role := range userRoles.Roles {
for _, guildRole := range roles {
if role == guildRole.ID && (guildRole.Name == "Dev" || guildRole.Name == "Division Heads" || guildRole.Name == "Helper") {
hasRole = true
break
}
}
}
if !hasRole {
return false, nil
}
return true, nil
}