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105 lines
2.6 KiB
Go
105 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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"github.com/golang-jwt/jwt/v5"
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)
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var (
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GoogleClientID string
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GoogleClientSecret string
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GoogleCallbackURL string
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)
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func HandleGoogleCallback(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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defer 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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googleId, err := RetrieveGoogleId(code)
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if err != nil {
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defer http.Redirect(w, r, GameURL, http.StatusSeeOther)
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return "", err
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}
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return googleId, nil
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}
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func RetrieveGoogleId(code string) (string, error) {
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v := make(url.Values)
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v.Set("client_id", GoogleClientID)
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v.Set("client_secret", GoogleClientSecret)
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v.Set("code", code)
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v.Set("grant_type", "authorization_code")
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v.Set("redirect_uri", GoogleCallbackURL)
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token, err := http.PostForm("https://oauth2.googleapis.com/token", v)
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if err != nil {
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return "", err
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}
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defer token.Body.Close()
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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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IdToken string `json:"id_token"`
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RefreshToken string `json:"refresh_token"`
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Scope string `json:"scope"`
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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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userId, err := parseJWTWithoutValidation(tokenResponse.IdToken)
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if err != nil {
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return "", err
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}
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return userId, nil
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}
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func parseJWTWithoutValidation(idToken string) (string, error) {
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parser := jwt.NewParser()
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// Use ParseUnverified to parse the token without validation
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parsedJwt, _, err := parser.ParseUnverified(idToken, jwt.MapClaims{})
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if err != nil {
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return "", err
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}
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claims, ok := parsedJwt.Claims.(jwt.MapClaims)
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if !ok {
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return "", errors.New("invalid token claims")
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}
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return claims.GetSubject()
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}
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