fix: adapt for subpath reverse proxies, embed web assets and fix relative URLs

internal/config/config.go

@@ -2,27 +2,53 @@ package config
 
 import (
 	"os"
+	"path/filepath"
 )
 
 type Config struct {
-	Port           string
-	BasePath       string
-	AppOrigin      string
-	SessionSecret  string
-	TurnstileSecret string
+	Port             string
+	BasePath         string
+	AppOrigin        string
+	SessionSecret    string
+	TurnstileSecret  string
 	TurnstileSiteKey string
-	DBPath         string
+	DBPath           string
+	AppDir           string
 }
 
 func Load() *Config {
+	appDir := os.Getenv("APP_DIR")
+	if appDir == "" {
+		appDir = "."
+	}
+
+	// BasePath: no Mini PaaS, as requisições chegam com prefixo já removido, portanto "" é o ideal.
+	// Se o usuário passar BASE_PATH explicitamente, respeita a variável.
+	basePath := os.Getenv("BASE_PATH")
+
+	dbPath := os.Getenv("DB_PATH")
+	if dbPath == "" {
+		dbPath = filepath.Join(appDir, "data", "initpage.db")
+	}
+
+	appOrigin := os.Getenv("APP_ORIGIN")
+	if appOrigin == "" {
+		domain := os.Getenv("PAAS_DOMAIN")
+		if domain == "" {
+			domain = "paas.weltonmoura.com.br"
+		}
+		appOrigin = "https://" + domain
+	}
+
 	return &Config{
-		Port:            getEnv("PORT", "8080"),
-		BasePath:        getEnv("BASE_PATH", "/initpage"),
-		AppOrigin:       getEnv("APP_ORIGIN", "https://apps.weltonmoura.com.br"),
-		SessionSecret:   getEnv("SESSION_SECRET", "dev-secret-change-me"),
-		TurnstileSecret: getEnv("TURNSTILE_SECRET", ""),
+		Port:             getEnv("PORT", "8080"),
+		BasePath:         basePath,
+		AppOrigin:        appOrigin,
+		SessionSecret:    getEnv("SESSION_SECRET", "dev-secret-change-me"),
+		TurnstileSecret:  getEnv("TURNSTILE_SECRET", ""),
 		TurnstileSiteKey: getEnv("TURNSTILE_SITEKEY", ""),
-		DBPath:          getEnv("DB_PATH", "./data/initpage.db"),
+		DBPath:           dbPath,
+		AppDir:           appDir,
 	}
 }