57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
// Package config loads the server configuration from environment
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// variables with sane defaults for local development.
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package config
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import (
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"fmt"
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"os"
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"strings"
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)
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// Config holds all runtime configuration for the API server.
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type Config struct {
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// HTTPAddr is the listen address, e.g. ":8080".
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HTTPAddr string
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// StaticDir points to the built frontend (React/Vite dist).
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// Empty disables static file serving.
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StaticDir string
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// Environment is "development", "staging" or "production".
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Environment string
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// AllowedOrigins is a comma-separated list of CORS origins
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// allowed to call the API from a browser.
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AllowedOrigins []string
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}
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// Load reads configuration from the environment, falling back to
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// development-friendly defaults. Unknown values are validated.
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func Load() (*Config, error) {
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cfg := &Config{
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HTTPAddr: fromEnv("MESSENGER_HTTP_ADDR", ":8080"),
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StaticDir: os.Getenv("MESSENGER_STATIC_DIR"),
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Environment: fromEnv("MESSENGER_ENV", "development"),
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}
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for _, origin := range strings.Split(fromEnv("MESSENGER_ALLOWED_ORIGINS", ""), ",") {
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if origin = strings.TrimSpace(origin); origin != "" {
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cfg.AllowedOrigins = append(cfg.AllowedOrigins, origin)
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}
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}
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switch cfg.Environment {
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case "development", "staging", "production":
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default:
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return nil, fmt.Errorf("MESSENGER_ENV must be one of development|staging|production, got %q", cfg.Environment)
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}
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return cfg, nil
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}
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// fromEnv returns the value of the environment variable name, or
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// fallback if the variable is unset or empty.
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func fromEnv(name, fallback string) string {
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if v := os.Getenv(name); v != "" {
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return v
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}
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return fallback
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}
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