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package rlapi
import (
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"time"
)
const (
egsUserAgent = "UELauncher/11.0.1-14907503+++Portal+Release-Live Windows/10.0.19041.1.256.64bit"
egsClientID = "34a02cf8f4414e29b15921876da36f9a"
egsClientSecret = "daafbccc737745039dffe53d94fc76cf"
egsOAuthURL = "account-public-service-prod03.ol.epicgames.com"
eosDeploymentID = "da32ae9c12ae40e8a112c52e1f17f3ba" // Rocket League
eosClientID = "xyza7891p5D7s9R6Gm6moTHWGloerp7B"
eosSecret = "Knh18du4NVlFs+3uQ+ZPpDCVto0WYf4yXP8+OcwVt1o"
)
type TokenResponse struct {
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
ExpiresIn int `json:"expires_in"`
ExpiresAt string `json:"expires_at"`
TokenType string `json:"token_type"`
ClientID string `json:"client_id"`
InternalClient bool `json:"internal_client"`
ClientService string `json:"client_service"`
AccountID string `json:"account_id"`
DisplayName string `json:"displayName"`
App string `json:"app"`
InAppID string `json:"in_app_id"`
DeviceID string `json:"device_id"`
}
type EOSTokenResponse struct {
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
IDToken string `json:"id_token"`
ExpiresIn int `json:"expires_in"`
ExpiresAt string `json:"expires_at"`
RefreshExpiresIn int `json:"refresh_expires_in"`
RefreshExpiresAt string `json:"refresh_expires_at"`
TokenType string `json:"token_type"`
Scope string `json:"scope"`
ClientID string `json:"client_id"`
ApplicationID string `json:"application_id"`
AccountID string `json:"account_id"`
SelectedAccountID string `json:"selected_account_id"`
MergedAccounts []string `json:"merged_accounts"`
ACR string `json:"acr"`
AuthTime string `json:"auth_time"`
}
type DeviceAuthResponse struct {
UserCode string `json:"user_code"`
DeviceCode string `json:"device_code"`
VerificationURI string `json:"verification_uri"`
ExpiresIn int `json:"expires_in"`
Interval int `json:"interval"`
}
// EGS provides an authentication layer for Epic Games Store -- largely adapted from https://github.com/derrod/legendary
type EGS struct {
client *http.Client
}
// NewEGS creates a new Epic Games Store client
func NewEGS() *EGS {
return &EGS{
client: &http.Client{Timeout: 30 * time.Second},
}
}
// GetAuthURL returns the EGS login URL for manual browser authentication
func (e *EGS) GetAuthURL() string {
loginURL := "https://www.epicgames.com/id/login?redirectUrl="
redirectURL := fmt.Sprintf("https://www.epicgames.com/id/api/redirect?clientId=%s&responseType=code", egsClientID)
return loginURL + url.QueryEscape(redirectURL)
}
// AuthenticateWithCode authenticates with EGS using an authorization code
func (e *EGS) AuthenticateWithCode(authCode string) (*TokenResponse, error) {
return e.requestToken(map[string]string{
"grant_type": "authorization_code",
"code": authCode,
"token_type": "eg1",
})
}
// AuthenticateWithRefreshToken authenticates with EGS using a refresh token
func (e *EGS) AuthenticateWithRefreshToken(refreshToken string) (*TokenResponse, error) {
return e.requestToken(map[string]string{
"grant_type": "refresh_token",
"refresh_token": refreshToken,
"token_type": "eg1",
})
}
func (e *EGS) requestToken(params map[string]string) (*TokenResponse, error) {
form := url.Values{}
for k, v := range params {
form.Set(k, v)
}
req, err := http.NewRequest("POST", fmt.Sprintf("https://%s/account/api/oauth/token", egsOAuthURL), strings.NewReader(form.Encode()))
if err != nil {
return nil, fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("User-Agent", egsUserAgent)
auth := base64.StdEncoding.EncodeToString([]byte(egsClientID + ":" + egsClientSecret))
req.Header.Set("Authorization", "Basic "+auth)
resp, err := e.client.Do(req)
if err != nil {
return nil, fmt.Errorf("failed to send request: %w", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("failed to read response: %w", err)
}
var tokenResp TokenResponse
if err := json.Unmarshal(body, &tokenResp); err != nil {
return nil, fmt.Errorf("failed to parse response: %w", err)
}
if resp.StatusCode != http.StatusOK {
var errorResp struct {
ErrorCode string `json:"errorCode"`
ErrorMessage string `json:"errorMessage"`
}
json.Unmarshal(body, &errorResp)
// TODO: proper error extraction
return nil, fmt.Errorf("authentication failed: %v, %s - %s", resp.StatusCode, errorResp.ErrorCode, errorResp.ErrorMessage)
}
return &tokenResp, nil
}
// GetExchangeCode converts an EGS access token into an exchange code for EOS
func (e *EGS) GetExchangeCode(accessToken string) (string, error) {
req, err := http.NewRequest("GET", fmt.Sprintf("https://%s/account/api/oauth/exchange", egsOAuthURL), nil)
if err != nil {
return "", fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Authorization", "bearer "+accessToken)
req.Header.Set("User-Agent", egsUserAgent)
resp, err := e.client.Do(req)
if err != nil {
return "", fmt.Errorf("failed to send request: %w", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return "", fmt.Errorf("failed to read response: %w", err)
}
if resp.StatusCode != http.StatusOK {
return "", fmt.Errorf("unexpected status code %s: %s", resp.Status, string(body))
}
var tokenResp struct {
Code string `json:"code"`
}
if err := json.Unmarshal(body, &tokenResp); err != nil {
return "", fmt.Errorf("failed to parse response: %w", err)
}
return tokenResp.Code, nil
}
// ExchangeEOSToken exchanges an exchange code for an EOS authentication token
func (e *EGS) ExchangeEOSToken(exchangeCode string) (*EOSTokenResponse, error) {
return e.requestEOSToken(map[string]string{
"grant_type": "exchange_code",
"exchange_code": exchangeCode,
})
}
// ExchangeEOSTokenFromSteam exchanges a Steam session ticket for an EOS authentication token
func (e *EGS) ExchangeEOSTokenFromSteam(steamTicket string) (*EOSTokenResponse, error) {
return e.requestEOSToken(map[string]string{
"grant_type": "external_auth",
"external_auth_type": "steam_session_ticket",
"external_auth_token": steamTicket,
})
}
// RefreshEOSToken refreshes an EOS authentication token using a refresh token
func (e *EGS) RefreshEOSToken(refreshToken string) (*EOSTokenResponse, error) {
return e.requestEOSToken(map[string]string{
"grant_type": "refresh_token",
"refresh_token": refreshToken,
})
}
func (e *EGS) requestEOSToken(params map[string]string) (*EOSTokenResponse, error) {
form := url.Values{}
for k, v := range params {
form.Set(k, v)
}
form.Set("deployment_id", eosDeploymentID)
form.Set("scope", "basic_profile")
req, err := http.NewRequest("POST", "https://api.epicgames.dev/epic/oauth/v2/token", strings.NewReader(form.Encode()))
if err != nil {
return nil, fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(eosClientID+":"+eosSecret)))
req.Header.Set("User-Agent", egsUserAgent)
resp, err := e.client.Do(req)
if err != nil {
return nil, fmt.Errorf("failed to send request: %w", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("failed to read response: %w", err)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("unexpected status code %s: %s", resp.Status, string(body))
}
var tokenResp EOSTokenResponse
if err := json.Unmarshal(body, &tokenResp); err != nil {
return nil, fmt.Errorf("failed to parse response: %w", err)
}
return &tokenResp, nil
}
// RevokeEOSToken revokes an EOS authentication token
func (e *EGS) RevokeEOSToken(accessToken string) error {
form := url.Values{}
form.Set("token", accessToken)
req, err := http.NewRequest("POST", "https://api.epicgames.dev/epic/oauth/v2/revoke", strings.NewReader(form.Encode()))
if err != nil {
return fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("User-Agent", egsUserAgent)
resp, err := e.client.Do(req)
if err != nil {
return fmt.Errorf("failed to send request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusNoContent {
return fmt.Errorf("unexpected status code: %s", resp.Status)
}
return nil
}
// AuthenticateWithDevice initiates the OAuth 2.0 Device Authorization Grant ([RFC 8628]).
// Display VerificationURI and UserCode to the user, then call [EGS.WaitForDeviceAuthorization] to exchange for an EOS token.
//
// [RFC 8628]: https://datatracker.ietf.org/doc/html/rfc8628
func (e *EGS) AuthenticateWithDevice() (*DeviceAuthResponse, error) {
req, err := http.NewRequest("POST", "https://api.epicgames.dev/epic/oauth/v2/deviceAuthorization", strings.NewReader("client_id="+eosClientID))
if err != nil {
return nil, fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("User-Agent", egsUserAgent)
resp, err := e.client.Do(req)
if err != nil {
return nil, fmt.Errorf("failed to send request: %w", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("failed to read response: %w", err)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("unexpected status code %s: %s", resp.Status, string(body))
}
var deviceAuthResp DeviceAuthResponse
if err := json.Unmarshal(body, &deviceAuthResp); err != nil {
return nil, fmt.Errorf("failed to parse response: %w", err)
}
return &deviceAuthResp, nil
}
// WaitForDeviceAuthorization polls EOS until the user completes authorization at VerificationURI, then returns an EOS token.
func (e *EGS) WaitForDeviceAuthorization(device *DeviceAuthResponse) (*EOSTokenResponse, error) {
for range device.ExpiresIn / device.Interval {
token, err := e.requestEOSToken(map[string]string{
"grant_type": "device_code",
"device_code": device.DeviceCode,
})
if err == nil {
return token, nil
}
time.Sleep(time.Duration(device.Interval) * time.Second)
}
return nil, fmt.Errorf("device authorization timed out")
}
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