feat: add JWT authentication middleware and login endpoint

whatsapp-bridge/config/config.go

@@ -0,0 +1,62 @@
+package config
+
+import (
+	"fmt"
+	"os"
+)
+
+type dbConfig struct {
+	User       string
+	Pass       string
+	Host       string
+	Port       string
+	IsPostgres bool
+}
+
+type Config struct {
+	DB        dbConfig
+	JWTSecret []byte
+	APIKey    string
+}
+
+func LoadConfig() (*Config, error) {
+	user, ok := os.LookupEnv("POSTGRES_USER")
+	if !ok {
+		return nil, fmt.Errorf("missing POSTGRES_USER")
+	}
+	pass, ok := os.LookupEnv("POSTGRES_PASS")
+	if !ok {
+		return nil, fmt.Errorf("missing POSTGRES_PASS")
+	}
+	host, ok := os.LookupEnv("POSTGRES_HOST")
+	if !ok {
+		return nil, fmt.Errorf("missing POSTGRES_HOST")
+	}
+	port, ok := os.LookupEnv("POSTGRES_PORT")
+	if !ok {
+		return nil, fmt.Errorf("missing POSTGRES_PORT")
+	}
+
+	jwtSecret, ok := os.LookupEnv("JWT_SECRET")
+	if !ok {
+		return nil, fmt.Errorf("missing JWT_SECRET")
+	}
+	apiKey, ok := os.LookupEnv("API_KEY")
+	if !ok {
+		return nil, fmt.Errorf("missing API_KEY")
+	}
+
+	isPostgres := os.Getenv("IS_POSTGRES") == "true"
+
+	return &Config{
+		DB: dbConfig{
+			User:       user,
+			Pass:       pass,
+			Host:       host,
+			Port:       port,
+			IsPostgres: isPostgres,
+		},
+		JWTSecret: []byte(jwtSecret),
+		APIKey:    apiKey,
+	}, nil
+}