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// Package addressbook manages contacts and their public keys
package addressbook
import (
"crypto/ed25519"
"encoding/hex"
"encoding/json"
"fmt"
"os"
"sync"
"time"
)
// Contact represents a contact in the address book
type Contact struct {
Name string `json:"name"`
PublicKey string `json:"public_key"` // hex-encoded Ed25519 public key
OnionAddress string `json:"onion_address"` // Tor hidden service address
Fingerprint string `json:"fingerprint"` // Short fingerprint for verification
AddedAt time.Time `json:"added_at"`
LastSeen time.Time `json:"last_seen"`
Verified bool `json:"verified"` // Manual verification flag
Notes string `json:"notes"`
Metadata map[string]string `json:"metadata,omitempty"`
}
// AddressBook manages a collection of contacts
type AddressBook struct {
contacts map[string]*Contact // key = public key hex
mu sync.RWMutex
path string
}
// NewAddressBook creates a new empty address book
func NewAddressBook() *AddressBook {
return &AddressBook{
contacts: make(map[string]*Contact),
}
}
// LoadAddressBook loads an address book from disk
func LoadAddressBook(path string) (*AddressBook, error) {
data, err := os.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("failed to read address book: %w", err)
}
var contacts []*Contact
if err := json.Unmarshal(data, &contacts); err != nil {
return nil, fmt.Errorf("failed to parse address book: %w", err)
}
ab := &AddressBook{
contacts: make(map[string]*Contact),
path: path,
}
for _, contact := range contacts {
ab.contacts[contact.PublicKey] = contact
}
return ab, nil
}
// Save saves the address book to disk
func (ab *AddressBook) Save(path string) error {
ab.mu.RLock()
defer ab.mu.RUnlock()
// Convert map to slice
contacts := make([]*Contact, 0, len(ab.contacts))
for _, contact := range ab.contacts {
contacts = append(contacts, contact)
}
// Marshal to JSON
data, err := json.MarshalIndent(contacts, "", " ")
if err != nil {
return fmt.Errorf("failed to marshal address book: %w", err)
}
// Write to file
if err := os.WriteFile(path, data, 0600); err != nil {
return fmt.Errorf("failed to write address book: %w", err)
}
ab.path = path
return nil
}
// AddContact adds a new contact to the address book
func (ab *AddressBook) AddContact(contact *Contact) error {
ab.mu.Lock()
defer ab.mu.Unlock()
// Validate public key
pubKeyBytes, err := hex.DecodeString(contact.PublicKey)
if err != nil {
return fmt.Errorf("invalid public key hex: %w", err)
}
if len(pubKeyBytes) != ed25519.PublicKeySize {
return fmt.Errorf("invalid public key size: expected %d, got %d", ed25519.PublicKeySize, len(pubKeyBytes))
}
// Generate fingerprint (first 8 bytes of public key)
contact.Fingerprint = hex.EncodeToString(pubKeyBytes[:8])
contact.AddedAt = time.Now()
contact.LastSeen = time.Now()
ab.contacts[contact.PublicKey] = contact
return nil
}
// GetContact retrieves a contact by public key
func (ab *AddressBook) GetContact(publicKey string) (*Contact, bool) {
ab.mu.RLock()
defer ab.mu.RUnlock()
contact, exists := ab.contacts[publicKey]
return contact, exists
}
// GetContactByName retrieves a contact by name (first match)
func (ab *AddressBook) GetContactByName(name string) (*Contact, bool) {
ab.mu.RLock()
defer ab.mu.RUnlock()
for _, contact := range ab.contacts {
if contact.Name == name {
return contact, true
}
}
return nil, false
}
// RemoveContact removes a contact from the address book
func (ab *AddressBook) RemoveContact(publicKey string) bool {
ab.mu.Lock()
defer ab.mu.Unlock()
if _, exists := ab.contacts[publicKey]; exists {
delete(ab.contacts, publicKey)
return true
}
return false
}
// UpdateLastSeen updates the last seen timestamp for a contact
func (ab *AddressBook) UpdateLastSeen(publicKey string) {
ab.mu.Lock()
defer ab.mu.Unlock()
if contact, exists := ab.contacts[publicKey]; exists {
contact.LastSeen = time.Now()
}
}
// MarkVerified marks a contact as manually verified
func (ab *AddressBook) MarkVerified(publicKey string, verified bool) error {
ab.mu.Lock()
defer ab.mu.Unlock()
contact, exists := ab.contacts[publicKey]
if !exists {
return fmt.Errorf("contact not found")
}
contact.Verified = verified
return nil
}
// ListContacts returns all contacts
func (ab *AddressBook) ListContacts() []*Contact {
ab.mu.RLock()
defer ab.mu.RUnlock()
contacts := make([]*Contact, 0, len(ab.contacts))
for _, contact := range ab.contacts {
contacts = append(contacts, contact)
}
return contacts
}
// Count returns the number of contacts
func (ab *AddressBook) Count() int {
ab.mu.RLock()
defer ab.mu.RUnlock()
return len(ab.contacts)
}
// Clear removes all contacts
func (ab *AddressBook) Clear() {
ab.mu.Lock()
defer ab.mu.Unlock()
ab.contacts = make(map[string]*Contact)
}
// VerifyFingerprint checks if a fingerprint matches a public key
func VerifyFingerprint(publicKeyHex, fingerprint string) bool {
pubKeyBytes, err := hex.DecodeString(publicKeyHex)
if err != nil {
return false
}
if len(pubKeyBytes) < 8 {
return false
}
expectedFingerprint := hex.EncodeToString(pubKeyBytes[:8])
return expectedFingerprint == fingerprint
}
// String returns a string representation
func (ab *AddressBook) String() string {
ab.mu.RLock()
defer ab.mu.RUnlock()
return fmt.Sprintf("AddressBook(contacts=%d)", len(ab.contacts))
}
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