Initialize Clash Web source and deployment documentation

internal/app/store.go

@@ -0,0 +1,74 @@
+package app
+
+import (
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	_ "modernc.org/sqlite"
+)
+
+type Store struct{ db *sql.DB }
+
+func OpenStore(dir string) (*Store, error) {
+	if err := os.MkdirAll(dir, 0700); err != nil {
+		return nil, err
+	}
+	p := filepath.Join(dir, "clashweb.sqlite")
+	f, err := os.OpenFile(p, os.O_CREATE|os.O_RDWR, 0600)
+	if err != nil {
+		return nil, err
+	}
+	f.Close()
+	db, err := sql.Open("sqlite", p)
+	if err != nil {
+		return nil, err
+	}
+	db.SetMaxOpenConns(1)
+	_, err = db.Exec(`PRAGMA journal_mode=WAL; PRAGMA busy_timeout=5000;
+	CREATE TABLE IF NOT EXISTS kv (key TEXT PRIMARY KEY, value TEXT NOT NULL);
+	CREATE TABLE IF NOT EXISTS sessions (token_hash TEXT PRIMARY KEY, csrf TEXT NOT NULL, expires INTEGER NOT NULL);
+	PRAGMA user_version=1;`)
+	if err != nil {
+		db.Close()
+		return nil, err
+	}
+	return &Store{db: db}, nil
+}
+
+func (s *Store) Close() error { return s.db.Close() }
+func (s *Store) Get(key string) (string, error) {
+	var value string
+	err := s.db.QueryRow("SELECT value FROM kv WHERE key=?", key).Scan(&value)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return value, err
+}
+func (s *Store) Set(key, value string) error {
+	_, err := s.db.Exec("INSERT INTO kv(key,value) VALUES(?,?) ON CONFLICT(key) DO UPDATE SET value=excluded.value", key, value)
+	return err
+}
+func (s *Store) Load() (State, error) {
+	text, err := s.Get("state")
+	if err != nil {
+		return State{}, err
+	}
+	if text == "" {
+		return defaultState(), nil
+	}
+	var state State
+	if err := json.Unmarshal([]byte(text), &state); err != nil {
+		return State{}, fmt.Errorf("数据库中的配置损坏: %w", err)
+	}
+	return state, validateState(state)
+}
+func (s *Store) Save(state State) error {
+	b, err := json.Marshal(state)
+	if err != nil {
+		return err
+	}
+	return s.Set("state", string(b))
+}