Initial commit

internal/config/config.go

@@ -0,0 +1,125 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/BurntSushi/toml"
+)
+
+type Config struct {
+	Server    ServerConfig    `toml:"server"`
+	Security  SecurityConfig  `toml:"security"`
+	Apify     ApifyConfig     `toml:"apify"`
+	Ntfy      NtfyConfig      `toml:"ntfy"`
+	Scheduler SchedulerConfig `toml:"scheduler"`
+}
+
+type ServerConfig struct {
+	Port   int    `toml:"port"`
+	DBPath string `toml:"db_path"`
+}
+
+type SecurityConfig struct {
+	SessionSecret string `toml:"session_secret"`
+	EncryptionKey string `toml:"encryption_key"`
+}
+
+type ApifyConfig struct {
+	APIKey string      `toml:"api_key"`
+	Actors ActorConfig `toml:"actors"`
+	Proxy  ProxyConfig `toml:"proxy"`
+}
+
+// ProxyConfig controls the proxyConfiguration block passed to apify actors
+// that scrape sites which block datacenter IPs (e.g. eBay returns 403 without
+// a residential proxy).
+type ProxyConfig struct {
+	UseApifyProxy bool     `toml:"use_apify_proxy"`
+	Groups        []string `toml:"groups"`
+	Country       string   `toml:"country"`
+}
+
+type ActorConfig struct {
+	ActiveListings      string `toml:"active_listings"`
+	SoldListings        string `toml:"sold_listings"`
+	PriceComparison     string `toml:"price_comparison"`
+	YahooAuctionsJP     string `toml:"yahoo_auctions_jp"`
+	YahooAuctionsJPSold string `toml:"yahoo_auctions_jp_sold"`
+	MercariJP           string `toml:"mercari_jp"`
+}
+
+type NtfyConfig struct {
+	BaseURL      string `toml:"base_url"`
+	DefaultTopic string `toml:"default_topic"`
+}
+
+type SchedulerConfig struct {
+	GlobalPollIntervalMinutes int     `toml:"global_poll_interval_minutes"`
+	MatchConfidenceThreshold  float64 `toml:"match_confidence_threshold"`
+}
+
+func Load(path string) (*Config, error) {
+	if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
+		return nil, fmt.Errorf("config file not found at %s. Copy config.toml.example to that path and fill it in", path)
+	} else if err != nil {
+		return nil, fmt.Errorf("stat config: %w", err)
+	}
+
+	var c Config
+	if _, err := toml.DecodeFile(path, &c); err != nil {
+		return nil, fmt.Errorf("parse config: %w", err)
+	}
+
+	if err := c.validate(); err != nil {
+		return nil, err
+	}
+	return &c, nil
+}
+
+func (c *Config) validate() error {
+	if len(c.Security.SessionSecret) < 32 {
+		return errors.New("security.session_secret must be at least 32 bytes")
+	}
+	if len(c.Security.EncryptionKey) < 32 {
+		return errors.New("security.encryption_key must be at least 32 bytes")
+	}
+	if c.Security.SessionSecret == c.Security.EncryptionKey {
+		return errors.New("security.session_secret and security.encryption_key must not be equal")
+	}
+	if c.Server.DBPath == "" {
+		return errors.New("server.db_path must be set")
+	}
+	dir := filepath.Dir(c.Server.DBPath)
+	if dir == "" {
+		dir = "."
+	}
+	if err := checkWritable(dir); err != nil {
+		return fmt.Errorf("server.db_path directory %s not writable: %w", dir, err)
+	}
+	if c.Server.Port == 0 {
+		c.Server.Port = 8080
+	}
+	if c.Scheduler.GlobalPollIntervalMinutes == 0 {
+		c.Scheduler.GlobalPollIntervalMinutes = 60
+	}
+	if c.Scheduler.MatchConfidenceThreshold == 0 {
+		c.Scheduler.MatchConfidenceThreshold = 0.6
+	}
+	if c.Ntfy.DefaultTopic == "" {
+		c.Ntfy.DefaultTopic = "veola"
+	}
+	return nil
+}
+
+func checkWritable(dir string) error {
+	f, err := os.CreateTemp(dir, ".veola-write-test-*")
+	if err != nil {
+		return err
+	}
+	name := f.Name()
+	f.Close()
+	return os.Remove(name)
+}