initial commit

internal/config/config.go

@@ -0,0 +1,88 @@
+package config
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Config struct {
+	FilePath string
+	Host     string
+	Port     int
+	Debug    bool
+	Quiet    bool
+	LogReads bool
+	LogFile  string
+	AuthRole string
+}
+
+func strEnv(key, fallback string) string {
+	if v, ok := os.LookupEnv(key); ok {
+		return v
+	}
+	return fallback
+}
+
+func intEnv(key string, fallback int) int {
+	if v, ok := os.LookupEnv(key); ok {
+		if n, err := strconv.Atoi(v); err == nil {
+			return n
+		}
+	}
+	return fallback
+}
+
+func boolEnvOrDefault(key string, fallback bool) bool {
+	if v, ok := os.LookupEnv(key); ok {
+		switch strings.ToLower(v) {
+		case "1", "true", "yes":
+			return true
+		default:
+			return false
+		}
+	}
+	return fallback
+}
+
+func Load() (*Config, error) {
+	c := &Config{
+		FilePath: "data/sample.xlsx",
+		Host:     "localhost",
+		Port:     3000,
+		Debug:    false,
+		Quiet:    false,
+		LogReads: true,
+		AuthRole: "writer",
+	}
+
+	flag.StringVar(&c.FilePath, "file", strEnv("RESTXLSX_FILE", c.FilePath), "Path to xlsx/xlsm file")
+	flag.StringVar(&c.Host, "host", strEnv("RESTXLSX_HOST", c.Host), "Listen host")
+	flag.IntVar(&c.Port, "port", intEnv("RESTXLSX_PORT", c.Port), "HTTP listen port")
+	flag.BoolVar(&c.Debug, "debug", boolEnvOrDefault("RESTXLSX_DEBUG", c.Debug), "Enable debug mode (swagger ui, etc.)")
+	quietFlag := flag.Bool("quiet", false, "Suppress stdout output")
+	flag.BoolVar(&c.LogReads, "log-reads", boolEnvOrDefault("RESTXLSX_LOG_READS", c.LogReads), "Log read operations")
+	flag.StringVar(&c.LogFile, "log-file", strEnv("RESTXLSX_LOG_FILE", c.LogFile), "Optional log file path")
+	flag.StringVar(&c.AuthRole, "auth", strEnv("RESTXLSX_AUTH", c.AuthRole), "Fallback auth role: admin, writer, reader (used when no OIDC token present)")
+	flag.Parse()
+
+	if *quietFlag || strings.EqualFold(os.Getenv("RESTXLSX_CONSOLE"), "quiet") {
+		c.Quiet = true
+	}
+
+	c.AuthRole = strings.ToLower(c.AuthRole)
+	switch c.AuthRole {
+	case "admin", "writer", "reader":
+	default:
+		return nil, fmt.Errorf("invalid auth role %q: must be admin, writer, or reader", c.AuthRole)
+	}
+
+	if !strings.HasSuffix(strings.ToLower(c.FilePath), ".xlsx") &&
+		!strings.HasSuffix(strings.ToLower(c.FilePath), ".xlsm") {
+		return nil, fmt.Errorf("unsupported file format: %s (must be .xlsx or .xlsm)", c.FilePath)
+	}
+
+	return c, nil
+}