phase 0 complete

internal/config/config.go

@@ -0,0 +1,139 @@
+// Package config loads and validates SoloPM's environment-variable configuration.
+package config
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// Config holds every environment-driven setting for the SoloPM server.
+type Config struct {
+	DatabaseURL   string
+	HTTPPort      string
+	BaseURL       string
+	SessionSecret string
+	UploadDir     string
+	MaxUploadMB   int
+
+	MeiliURL string
+	MeiliKey string
+
+	SMTPHost string
+	SMTPPort string
+	SMTPUser string
+	SMTPPass string
+	SMTPFrom string
+
+	GitHubClientID     string
+	GitHubClientSecret string
+
+	GiteaURL          string
+	GiteaClientID     string
+	GiteaClientSecret string
+
+	CullAfterDays int
+	LogLevel      string
+}
+
+// SearchEnabled reports whether Meilisearch is configured.
+func (c *Config) SearchEnabled() bool {
+	return c.MeiliURL != "" && c.MeiliKey != ""
+}
+
+// EmailEnabled reports whether SMTP is configured.
+func (c *Config) EmailEnabled() bool {
+	return c.SMTPHost != ""
+}
+
+// GitHubOAuthEnabled reports whether GitHub OAuth is configured.
+func (c *Config) GitHubOAuthEnabled() bool {
+	return c.GitHubClientID != "" && c.GitHubClientSecret != ""
+}
+
+// GiteaOAuthEnabled reports whether Gitea OAuth is configured.
+func (c *Config) GiteaOAuthEnabled() bool {
+	return c.GiteaURL != "" && c.GiteaClientID != "" && c.GiteaClientSecret != ""
+}
+
+// Load reads configuration from the environment, applying defaults and
+// failing fast (returning an error) if a required variable is missing or
+// malformed.
+func Load() (*Config, error) {
+	var missing []string
+	required := func(key string) string {
+		v := os.Getenv(key)
+		if v == "" {
+			missing = append(missing, key)
+		}
+		return v
+	}
+
+	c := &Config{
+		DatabaseURL:   required("DATABASE_URL"),
+		HTTPPort:      getDefault("HTTP_PORT", "8080"),
+		BaseURL:       required("BASE_URL"),
+		SessionSecret: required("SESSION_SECRET"),
+		UploadDir:     getDefault("UPLOAD_DIR", "./uploads"),
+
+		MeiliURL: os.Getenv("MEILI_URL"),
+		MeiliKey: os.Getenv("MEILI_KEY"),
+
+		SMTPHost: os.Getenv("SMTP_HOST"),
+		SMTPPort: os.Getenv("SMTP_PORT"),
+		SMTPUser: os.Getenv("SMTP_USER"),
+		SMTPPass: os.Getenv("SMTP_PASS"),
+		SMTPFrom: os.Getenv("SMTP_FROM"),
+
+		GitHubClientID:     os.Getenv("GITHUB_CLIENT_ID"),
+		GitHubClientSecret: os.Getenv("GITHUB_CLIENT_SECRET"),
+
+		GiteaURL:          os.Getenv("GITEA_URL"),
+		GiteaClientID:     os.Getenv("GITEA_CLIENT_ID"),
+		GiteaClientSecret: os.Getenv("GITEA_CLIENT_SECRET"),
+
+		LogLevel: getDefault("LOG_LEVEL", "info"),
+	}
+
+	if len(missing) > 0 {
+		return nil, fmt.Errorf("config: missing required environment variable(s): %s", strings.Join(missing, ", "))
+	}
+
+	if len(c.SessionSecret) < 32 {
+		return nil, fmt.Errorf("config: SESSION_SECRET must be at least 32 bytes, got %d", len(c.SessionSecret))
+	}
+
+	maxUploadMB, err := getIntDefault("MAX_UPLOAD_MB", 25)
+	if err != nil {
+		return nil, err
+	}
+	c.MaxUploadMB = maxUploadMB
+
+	cullAfterDays, err := getIntDefault("CULL_AFTER_DAYS", 30)
+	if err != nil {
+		return nil, err
+	}
+	c.CullAfterDays = cullAfterDays
+
+	return c, nil
+}
+
+func getDefault(key, def string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return def
+}
+
+func getIntDefault(key string, def int) (int, error) {
+	v := os.Getenv(key)
+	if v == "" {
+		return def, nil
+	}
+	n, err := strconv.Atoi(v)
+	if err != nil {
+		return 0, fmt.Errorf("config: %s must be an integer, got %q", key, v)
+	}
+	return n, nil
+}