feat: first commit

backend/internal/config/config.go

@@ -0,0 +1,92 @@
+// Package config loads runtime settings from the environment.
+package config
+
+import (
+	"os"
+	"strconv"
+	"time"
+)
+
+type Config struct {
+	// Storage: "postgres" (default) or "memory" (no infra, for dev/tests).
+	Store       string
+	DatabaseURL string
+
+	RedisAddr     string
+	RedisPassword string
+	RedisDB       int
+
+	// PublicURL is the externally reachable base (used to build OAuth callback
+	// URLs). PostLoginRedirect is where users land after a successful login.
+	PublicURL         string
+	PostLoginRedirect string
+
+	// FrontendDist is the directory of the built SPA served by the frontend cmd.
+	FrontendDist string
+
+	// ShortDomain is the display host for short links (e.g. snip.to).
+	ShortDomain string
+
+	SessionSecret string
+	CookieSecure  bool
+
+	// Identity providers (each optional; absent => that login button is hidden).
+	GoogleClientID     string
+	GoogleClientSecret string
+	OIDCIssuer         string
+	OIDCClientID       string
+	OIDCClientSecret   string
+
+	ClickFlushInterval time.Duration
+}
+
+func env(key, def string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return def
+}
+
+func envBool(key string, def bool) bool {
+	if v := os.Getenv(key); v != "" {
+		b, err := strconv.ParseBool(v)
+		if err == nil {
+			return b
+		}
+	}
+	return def
+}
+
+func envInt(key string, def int) int {
+	if v := os.Getenv(key); v != "" {
+		n, err := strconv.Atoi(v)
+		if err == nil {
+			return n
+		}
+	}
+	return def
+}
+
+// Load reads configuration from the environment with sensible local defaults.
+func Load() Config {
+	flush := time.Duration(envInt("CLICK_FLUSH_SECONDS", 10)) * time.Second
+	return Config{
+		Store:              env("STORE", "postgres"),
+		DatabaseURL:        env("DATABASE_URL", "postgres://snip:snip@localhost:5432/snip?sslmode=disable"),
+		RedisAddr:          env("REDIS_ADDR", "localhost:6379"),
+		RedisPassword:      env("REDIS_PASSWORD", ""),
+		RedisDB:            envInt("REDIS_DB", 0),
+		PublicURL:          env("PUBLIC_URL", "http://localhost:8080"),
+		PostLoginRedirect:  env("POST_LOGIN_REDIRECT", "/dashboard"),
+		FrontendDist:       env("FRONTEND_DIST", "./web"),
+		ShortDomain:        env("SHORT_DOMAIN", "snip.to"),
+		SessionSecret:      env("SESSION_SECRET", "dev-insecure-secret-change-me"),
+		CookieSecure:       envBool("COOKIE_SECURE", false),
+		GoogleClientID:     env("GOOGLE_CLIENT_ID", ""),
+		GoogleClientSecret: env("GOOGLE_CLIENT_SECRET", ""),
+		OIDCIssuer:         env("OIDC_ISSUER", ""),
+		OIDCClientID:       env("OIDC_CLIENT_ID", ""),
+		OIDCClientSecret:   env("OIDC_CLIENT_SECRET", ""),
+		ClickFlushInterval: flush,
+	}
+}