iamatulsingh
78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
package helpers
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"log/slog"
|
|
"net/http"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/golang-jwt/jwt/v5"
|
|
)
|
|
|
|
var (
|
|
apiSecret = ReadEnv("WHATSAPP_API_SECRET", "")
|
|
jwtToken string
|
|
tokenMutex sync.Mutex
|
|
tokenExpiresAt time.Time
|
|
)
|
|
|
|
// GetOrRefreshJwtToken returns a valid JWT or fetches a new one
|
|
func GetOrRefreshJwtToken() (string, error) {
|
|
tokenMutex.Lock()
|
|
defer tokenMutex.Unlock()
|
|
|
|
// Reuse token if still valid
|
|
if jwtToken != "" && time.Now().Before(tokenExpiresAt.Add(-30*time.Second)) {
|
|
return jwtToken, nil
|
|
}
|
|
|
|
// Request new token
|
|
req, err := http.NewRequest("POST", fmt.Sprintf("%s/%s", strings.TrimSuffix(apiBaseURL, "/api"), "auth/login"), nil)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", apiSecret))
|
|
|
|
client := &http.Client{Timeout: 10 * time.Second}
|
|
resp, err := client.Do(req)
|
|
if err != nil {
|
|
return "", fmt.Errorf("auth request failed: %w", err)
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
if resp.StatusCode != http.StatusOK {
|
|
body, _ := io.ReadAll(resp.Body)
|
|
return "", fmt.Errorf("auth failed %d: %s", resp.StatusCode, string(body))
|
|
}
|
|
|
|
var data struct {
|
|
Token string `json:"token"`
|
|
}
|
|
if err := json.NewDecoder(resp.Body).Decode(&data); err != nil {
|
|
return "", fmt.Errorf("failed to decode token response: %w", err)
|
|
}
|
|
|
|
if data.Token == "" {
|
|
return "", fmt.Errorf("no token returned from /auth/login")
|
|
}
|
|
|
|
// Parse WITHOUT verifying signature
|
|
parsed, _, err := jwt.NewParser().ParseUnverified(data.Token, jwt.MapClaims{})
|
|
if err == nil {
|
|
if claims, ok := parsed.Claims.(jwt.MapClaims); ok {
|
|
if exp, ok := claims["exp"].(float64); ok {
|
|
tokenExpiresAt = time.Unix(int64(exp), 0)
|
|
}
|
|
}
|
|
}
|
|
|
|
jwtToken = data.Token
|
|
slog.Info("Fetched new JWT token", "expires", tokenExpiresAt)
|
|
|
|
return jwtToken, nil
|
|
}
|