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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package oauth2_provider //nolint
import (
"context"
"fmt"
auth "code.gitea.io/gitea/models/auth"
"code.gitea.io/gitea/models/db"
org_model "code.gitea.io/gitea/models/organization"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/timeutil"
"github.com/golang-jwt/jwt/v5"
)
// AccessTokenErrorCode represents an error code specified in RFC 6749
// https://datatracker.ietf.org/doc/html/rfc6749#section-5.2
type AccessTokenErrorCode string
const (
// AccessTokenErrorCodeInvalidRequest represents an error code specified in RFC 6749
AccessTokenErrorCodeInvalidRequest AccessTokenErrorCode = "invalid_request"
// AccessTokenErrorCodeInvalidClient represents an error code specified in RFC 6749
AccessTokenErrorCodeInvalidClient = "invalid_client"
// AccessTokenErrorCodeInvalidGrant represents an error code specified in RFC 6749
AccessTokenErrorCodeInvalidGrant = "invalid_grant"
// AccessTokenErrorCodeUnauthorizedClient represents an error code specified in RFC 6749
AccessTokenErrorCodeUnauthorizedClient = "unauthorized_client"
// AccessTokenErrorCodeUnsupportedGrantType represents an error code specified in RFC 6749
AccessTokenErrorCodeUnsupportedGrantType = "unsupported_grant_type"
// AccessTokenErrorCodeInvalidScope represents an error code specified in RFC 6749
AccessTokenErrorCodeInvalidScope = "invalid_scope"
)
// AccessTokenError represents an error response specified in RFC 6749
// https://datatracker.ietf.org/doc/html/rfc6749#section-5.2
type AccessTokenError struct {
ErrorCode AccessTokenErrorCode `json:"error" form:"error"`
ErrorDescription string `json:"error_description"`
}
// Error returns the error message
func (err AccessTokenError) Error() string {
return fmt.Sprintf("%s: %s", err.ErrorCode, err.ErrorDescription)
}
// TokenType specifies the kind of token
type TokenType string
const (
// TokenTypeBearer represents a token type specified in RFC 6749
TokenTypeBearer TokenType = "bearer"
// TokenTypeMAC represents a token type specified in RFC 6749
TokenTypeMAC = "mac"
)
// AccessTokenResponse represents a successful access token response
// https://datatracker.ietf.org/doc/html/rfc6749#section-4.2.2
type AccessTokenResponse struct {
AccessToken string `json:"access_token"`
TokenType TokenType `json:"token_type"`
ExpiresIn int64 `json:"expires_in"`
RefreshToken string `json:"refresh_token"`
IDToken string `json:"id_token,omitempty"`
}
func NewAccessTokenResponse(ctx context.Context, grant *auth.OAuth2Grant, serverKey, clientKey JWTSigningKey) (*AccessTokenResponse, *AccessTokenError) {
if setting.OAuth2.InvalidateRefreshTokens {
if err := grant.IncreaseCounter(ctx); err != nil {
return nil, &AccessTokenError{
ErrorCode: AccessTokenErrorCodeInvalidGrant,
ErrorDescription: "cannot increase the grant counter",
}
}
}
// generate access token to access the API
expirationDate := timeutil.TimeStampNow().Add(setting.OAuth2.AccessTokenExpirationTime)
accessToken := &Token{
GrantID: grant.ID,
Kind: KindAccessToken,
RegisteredClaims: jwt.RegisteredClaims{
ExpiresAt: jwt.NewNumericDate(expirationDate.AsTime()),
},
}
signedAccessToken, err := accessToken.SignToken(serverKey)
if err != nil {
return nil, &AccessTokenError{
ErrorCode: AccessTokenErrorCodeInvalidRequest,
ErrorDescription: "cannot sign token",
}
}
// generate refresh token to request an access token after it expired later
refreshExpirationDate := timeutil.TimeStampNow().Add(setting.OAuth2.RefreshTokenExpirationTime * 60 * 60).AsTime()
refreshToken := &Token{
GrantID: grant.ID,
Counter: grant.Counter,
Kind: KindRefreshToken,
RegisteredClaims: jwt.RegisteredClaims{
ExpiresAt: jwt.NewNumericDate(refreshExpirationDate),
},
}
signedRefreshToken, err := refreshToken.SignToken(serverKey)
if err != nil {
return nil, &AccessTokenError{
ErrorCode: AccessTokenErrorCodeInvalidRequest,
ErrorDescription: "cannot sign token",
}
}
// generate OpenID Connect id_token
signedIDToken := ""
if grant.ScopeContains("openid") {
app, err := auth.GetOAuth2ApplicationByID(ctx, grant.ApplicationID)
if err != nil {
return nil, &AccessTokenError{
ErrorCode: AccessTokenErrorCodeInvalidRequest,
ErrorDescription: "cannot find application",
}
}
user, err := user_model.GetUserByID(ctx, grant.UserID)
if err != nil {
if user_model.IsErrUserNotExist(err) {
return nil, &AccessTokenError{
ErrorCode: AccessTokenErrorCodeInvalidRequest,
ErrorDescription: "cannot find user",
}
}
log.Error("Error loading user: %v", err)
return nil, &AccessTokenError{
ErrorCode: AccessTokenErrorCodeInvalidRequest,
ErrorDescription: "server error",
}
}
idToken := &OIDCToken{
RegisteredClaims: jwt.RegisteredClaims{
ExpiresAt: jwt.NewNumericDate(expirationDate.AsTime()),
Issuer: setting.AppURL,
Audience: []string{app.ClientID},
Subject: fmt.Sprint(grant.UserID),
},
Nonce: grant.Nonce,
}
if grant.ScopeContains("profile") {
idToken.Name = user.GetDisplayName()
idToken.PreferredUsername = user.Name
idToken.Profile = user.HTMLURL()
idToken.Picture = user.AvatarLink(ctx)
idToken.Website = user.Website
idToken.Locale = user.Language
idToken.UpdatedAt = user.UpdatedUnix
}
if grant.ScopeContains("email") {
idToken.Email = user.Email
idToken.EmailVerified = user.IsActive
}
if grant.ScopeContains("groups") {
groups, err := GetOAuthGroupsForUser(ctx, user)
if err != nil {
log.Error("Error getting groups: %v", err)
return nil, &AccessTokenError{
ErrorCode: AccessTokenErrorCodeInvalidRequest,
ErrorDescription: "server error",
}
}
idToken.Groups = groups
}
signedIDToken, err = idToken.SignToken(clientKey)
if err != nil {
return nil, &AccessTokenError{
ErrorCode: AccessTokenErrorCodeInvalidRequest,
ErrorDescription: "cannot sign token",
}
}
}
return &AccessTokenResponse{
AccessToken: signedAccessToken,
TokenType: TokenTypeBearer,
ExpiresIn: setting.OAuth2.AccessTokenExpirationTime,
RefreshToken: signedRefreshToken,
IDToken: signedIDToken,
}, nil
}
// returns a list of "org" and "org:team" strings,
// that the given user is a part of.
func GetOAuthGroupsForUser(ctx context.Context, user *user_model.User) ([]string, error) {
orgs, err := db.Find[org_model.Organization](ctx, org_model.FindOrgOptions{
UserID: user.ID,
IncludePrivate: true,
})
if err != nil {
return nil, fmt.Errorf("GetUserOrgList: %w", err)
}
var groups []string
for _, org := range orgs {
groups = append(groups, org.Name)
teams, err := org.LoadTeams(ctx)
if err != nil {
return nil, fmt.Errorf("LoadTeams: %w", err)
}
for _, team := range teams {
if team.IsMember(ctx, user.ID) {
groups = append(groups, org.Name+":"+team.LowerName)
}
}
}
return groups, nil
}
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