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// Package store contains the local, non-secret Aegis cache.
package store
import (
"encoding/json"
"errors"
"fmt"
"os"
"path/filepath"
"sync"
"time"
"aegis/internal/filter"
)
const (
stateVersion = 1
maxArticleBytes = 16 << 20
maxDraftBytes = 2 << 20
)
type Article struct {
Key string `json:"key"`
Group string `json:"group"`
Number int64 `json:"number"`
Subject string `json:"subject,omitempty"`
From string `json:"from,omitempty"`
MessageID string `json:"message_id,omitempty"`
Raw string `json:"raw,omitempty"`
Read bool `json:"read"`
Bookmarked bool `json:"bookmarked"`
Tags []string `json:"tags,omitempty"`
FetchedAt time.Time `json:"fetched_at"`
}
type Draft struct {
ID string `json:"id"`
Groups string `json:"groups,omitempty"`
From string `json:"from,omitempty"`
Subject string `json:"subject,omitempty"`
Body string `json:"body,omitempty"`
References string `json:"references,omitempty"`
FollowupTo string `json:"followup_to,omitempty"`
UpdatedAt time.Time `json:"updated_at"`
}
type State struct {
Version int `json:"version"`
Articles map[string]Article `json:"articles"`
Drafts map[string]Draft `json:"drafts"`
Filters []filter.Rule `json:"filters,omitempty"`
}
type Store struct {
mu sync.RWMutex
path string
state State
}
func DefaultPath() (string, error) {
dir, err := os.UserConfigDir()
if err != nil {
return "", fmt.Errorf("locate user configuration directory: %w", err)
}
return filepath.Join(dir, "aegis", "state.json"), nil
}
func Open(path string) (*Store, error) {
if path == "" {
return nil, errors.New("state path is required")
}
s := &Store{path: path, state: emptyState()}
data, err := os.ReadFile(path)
if errors.Is(err, os.ErrNotExist) {
return s, nil
}
if err != nil {
return nil, fmt.Errorf("read local state: %w", err)
}
if len(data) > 32<<20 {
return nil, errors.New("local state is too large")
}
if err := json.Unmarshal(data, &s.state); err != nil {
return nil, fmt.Errorf("decode local state: %w", err)
}
if s.state.Version == 0 {
s.state.Version = stateVersion
}
if s.state.Version != stateVersion {
return nil, fmt.Errorf("unsupported local state version %d", s.state.Version)
}
if s.state.Articles == nil {
s.state.Articles = make(map[string]Article)
}
if s.state.Drafts == nil {
s.state.Drafts = make(map[string]Draft)
}
return s, nil
}
func emptyState() State {
return State{Version: stateVersion, Articles: make(map[string]Article), Drafts: make(map[string]Draft)}
}
func (s *Store) Save() error {
s.mu.RLock()
data, err := json.MarshalIndent(s.state, "", " ")
s.mu.RUnlock()
if err != nil {
return fmt.Errorf("encode local state: %w", err)
}
dir := filepath.Dir(s.path)
if err := os.MkdirAll(dir, 0o700); err != nil {
return fmt.Errorf("create local state directory: %w", err)
}
if err := os.Chmod(dir, 0o700); err != nil {
return fmt.Errorf("protect local state directory: %w", err)
}
tmp, err := os.CreateTemp(dir, ".state-*.tmp")
if err != nil {
return fmt.Errorf("create local state temporary file: %w", err)
}
tmpName := tmp.Name()
defer os.Remove(tmpName)
if err := tmp.Chmod(0o600); err != nil {
_ = tmp.Close()
return err
}
if _, err := tmp.Write(append(data, '\n')); err != nil {
_ = tmp.Close()
return fmt.Errorf("write local state: %w", err)
}
if err := tmp.Sync(); err != nil {
_ = tmp.Close()
return fmt.Errorf("sync local state: %w", err)
}
if err := tmp.Close(); err != nil {
return err
}
if err := os.Rename(tmpName, s.path); err != nil {
return fmt.Errorf("commit local state: %w", err)
}
return nil
}
func (s *Store) Snapshot() State {
s.mu.RLock()
defer s.mu.RUnlock()
result := emptyState()
result.Filters = append(result.Filters, s.state.Filters...)
for key, article := range s.state.Articles {
article.Tags = append([]string(nil), article.Tags...)
result.Articles[key] = article
}
for key, draft := range s.state.Drafts {
result.Drafts[key] = draft
}
return result
}
func (s *Store) UpsertArticle(article Article) error {
if article.Key == "" {
return errors.New("article key is required")
}
if len(article.Raw) > maxArticleBytes {
return errors.New("article exceeds local cache limit")
}
s.mu.Lock()
if old, ok := s.state.Articles[article.Key]; ok {
article.Read = old.Read
article.Bookmarked = old.Bookmarked
if len(article.Tags) == 0 {
article.Tags = append([]string(nil), old.Tags...)
}
}
if article.FetchedAt.IsZero() {
article.FetchedAt = time.Now().UTC()
}
s.state.Articles[article.Key] = article
s.mu.Unlock()
return nil
}
func (s *Store) SetRead(key string, read bool) error {
s.mu.Lock()
defer s.mu.Unlock()
article, ok := s.state.Articles[key]
if !ok {
return errors.New("article not found")
}
article.Read = read
s.state.Articles[key] = article
return nil
}
func (s *Store) SetBookmarked(key string, bookmarked bool) error {
s.mu.Lock()
defer s.mu.Unlock()
article, ok := s.state.Articles[key]
if !ok {
return errors.New("article not found")
}
article.Bookmarked = bookmarked
s.state.Articles[key] = article
return nil
}
func (s *Store) SaveDraft(draft Draft) error {
if draft.ID == "" {
return errors.New("draft ID is required")
}
if len(draft.Body) > maxDraftBytes {
return errors.New("draft exceeds local size limit")
}
draft.UpdatedAt = time.Now().UTC()
s.mu.Lock()
s.state.Drafts[draft.ID] = draft
s.mu.Unlock()
return nil
}
func (s *Store) DeleteDraft(id string) {
s.mu.Lock()
delete(s.state.Drafts, id)
s.mu.Unlock()
}
func (s *Store) SetFilters(rules []filter.Rule) {
s.mu.Lock()
s.state.Filters = append([]filter.Rule(nil), rules...)
s.mu.Unlock()
}
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