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package main
import (
"encoding/hex"
"fmt"
"os"
"gopkg.in/yaml.v3"
)
// Config holds all relay configuration loaded from config.yaml.
type Config struct {
Addr string `yaml:"addr"`
DB string `yaml:"db"`
RelayURL string `yaml:"relay_url"`
Allowlist []string `yaml:"allowlist"` // hex-encoded pubkeys
}
// DefaultConfig returns sensible defaults.
func DefaultConfig() Config {
return Config{
Addr: ":8080",
DB: "axon.db",
RelayURL: "ws://localhost:8080",
}
}
// AllowlistBytes decodes the hex pubkeys in c.Allowlist and returns them as
// raw byte slices. Returns an error if any entry is not valid 64-char hex.
func (c *Config) AllowlistBytes() ([][]byte, error) {
out := make([][]byte, 0, len(c.Allowlist))
for _, h := range c.Allowlist {
b, err := hex.DecodeString(h)
if err != nil {
return nil, fmt.Errorf("config: allowlist entry %q is not valid hex: %w", h, err)
}
if len(b) != 32 {
return nil, fmt.Errorf("config: allowlist entry %q decoded to %d bytes, want 32", h, len(b))
}
out = append(out, b)
}
return out, nil
}
// LoadConfig reads and parses a YAML config file. Missing fields fall back to
// DefaultConfig values.
func LoadConfig(path string) (Config, error) {
cfg := DefaultConfig()
f, err := os.Open(path)
if err != nil {
if os.IsNotExist(err) {
// No config file — use defaults.
return cfg, nil
}
return cfg, fmt.Errorf("config: open %q: %w", path, err)
}
defer f.Close()
dec := yaml.NewDecoder(f)
dec.KnownFields(true)
if err := dec.Decode(&cfg); err != nil {
return cfg, fmt.Errorf("config: decode %q: %w", path, err)
}
return cfg, nil
}
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