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package esi
import (
"bytes"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"time"
)
const (
EsiBaseURL = "https://esi.evetech.net/latest"
UserAgent = "Haul (Hyperspace Asset Unloading and Loading) - Go Port"
ErrorLimitThresh = 50
)
type AuthData struct {
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
ExpiresAt float64 `json:"expires_at"`
}
type EsiClient struct {
HttpClient *http.Client
AuthFilePath string
TokenMutex sync.Mutex
ClientID string
SecretKey string
}
func NewEsiClient(authFilePath string) *EsiClient {
clientID := os.Getenv("CLIENT_ID")
secretKey := os.Getenv("SECRET_KEY")
// Default to generic timeout
client := &http.Client{
Timeout: 10 * time.Second,
}
return &EsiClient{
HttpClient: client,
AuthFilePath: authFilePath,
ClientID: clientID,
SecretKey: secretKey,
}
}
// GetAccessToken checks if the token is valid, refreshing if needed or forced.
func (c *EsiClient) GetAccessToken(forceRefresh bool) (string, error) {
c.TokenMutex.Lock()
defer c.TokenMutex.Unlock()
data, err := os.ReadFile(c.AuthFilePath)
if err != nil {
return "", fmt.Errorf("failed to read auth file: %w", err)
}
var auth AuthData
if err := json.Unmarshal(data, &auth); err != nil {
return "", fmt.Errorf("failed to parse auth file: %w", err)
}
now := float64(time.Now().Unix())
// Refresh if expired or soon to expire (within 20 mins)
if forceRefresh || auth.ExpiresAt < now+1200 {
return c.refreshAccessToken(auth.RefreshToken)
}
return auth.AccessToken, nil
}
func (c *EsiClient) refreshAccessToken(refreshToken string) (string, error) {
if c.ClientID == "" || c.SecretKey == "" {
return "", errors.New("CLIENT_ID and SECRET_KEY environment variables not set")
}
tokenURL := "https://login.eveonline.com/v2/oauth/token"
data := url.Values{}
data.Set("grant_type", "refresh_token")
data.Set("refresh_token", refreshToken)
req, err := http.NewRequest("POST", tokenURL, strings.NewReader(data.Encode()))
if err != nil {
return "", err
}
authStr := base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", c.ClientID, c.SecretKey)))
req.Header.Add("Authorization", "Basic "+authStr)
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("Host", "login.eveonline.com")
resp, err := c.HttpClient.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
bodyBytes, _ := io.ReadAll(resp.Body)
return "", fmt.Errorf("failed to refresh token, status %d: %s", resp.StatusCode, string(bodyBytes))
}
var respData struct {
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
ExpiresIn int64 `json:"expires_in"`
}
if err := json.NewDecoder(resp.Body).Decode(&respData); err != nil {
return "", err
}
// Update auth file
newAuth := AuthData{
AccessToken: respData.AccessToken,
RefreshToken: respData.RefreshToken,
ExpiresAt: float64(time.Now().Unix() + respData.ExpiresIn),
}
// Ensure cache dir exists
os.MkdirAll(filepath.Dir(c.AuthFilePath), 0755)
outBytes, err := json.MarshalIndent(newAuth, "", " ")
if err != nil {
return "", err
}
if err := os.WriteFile(c.AuthFilePath, outBytes, 0644); err != nil {
return "", err
}
return newAuth.AccessToken, nil
}
func (c *EsiClient) doRequest(method, endpoint string, body []byte, allowRetry bool) (*http.Response, error) {
url := fmt.Sprintf("%s%s", EsiBaseURL, endpoint)
for attempt := 1; attempt <= 3; attempt++ {
token, err := c.GetAccessToken(false)
if err != nil {
return nil, err
}
var reqBody io.Reader
if body != nil {
reqBody = bytes.NewReader(body)
}
req, err := http.NewRequest(method, url, reqBody)
if err != nil {
return nil, err
}
req.Header.Set("Accept", "application/json")
req.Header.Set("Cache-Control", "no-cache")
req.Header.Set("Authorization", "Bearer "+token)
req.Header.Set("User-Agent", UserAgent)
if body != nil {
req.Header.Set("Content-Type", "application/json")
}
resp, err := c.HttpClient.Do(req)
if err != nil {
return nil, err
}
// Check ESI Error Limit
if remainStr := resp.Header.Get("x-esi-error-limit-remain"); remainStr != "" {
if remain, err := strconv.Atoi(remainStr); err == nil && remain < ErrorLimitThresh {
resp.Body.Close()
return nil, fmt.Errorf("ESI error limit threshold reached: %d remaining", remain)
}
}
if resp.StatusCode == 401 && allowRetry && attempt == 1 {
resp.Body.Close()
_, _ = c.GetAccessToken(true) // Force refresh
continue
}
if resp.StatusCode == 429 && allowRetry {
resp.Body.Close()
time.Sleep(time.Duration(2*attempt) * time.Second)
continue
}
if resp.StatusCode == 403 {
resp.Body.Close()
return nil, errors.New("permission denied (403). Check ESI scopes")
}
return resp, nil
}
return nil, errors.New("max retries exceeded")
}
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