Support live collection shares with stable member scopes

internal/store/shares.go

@@ -0,0 +1,43 @@
+package store
+
+import "database/sql"
+
+const shareSchema = `
+-- 分享令牌是可复制的访问凭据，与笔记同等敏感。
+CREATE TABLE IF NOT EXISTS shares (
+ token TEXT PRIMARY KEY,
+ password_hash TEXT NOT NULL DEFAULT '',
+ created_at INTEGER NOT NULL,
+ expires_at INTEGER NOT NULL DEFAULT 0
+);
+CREATE TABLE IF NOT EXISTS share_items (
+ share_token TEXT NOT NULL REFERENCES shares(token) ON DELETE CASCADE,
+ item_id INTEGER NOT NULL,
+ path TEXT NOT NULL,
+ PRIMARY KEY (share_token,item_id)
+);
+CREATE INDEX IF NOT EXISTS share_items_path ON share_items(path);
+`
+
+// 仅迁移项目已有的单路径表；事务保证中断或失败时仍保留原格式。
+func migrateShares(db *sql.DB) error {
+	var legacy bool
+	if err := db.QueryRow(`SELECT EXISTS(SELECT 1 FROM pragma_table_info('shares') WHERE name = 'path')`).Scan(&legacy); err != nil {
+		return err
+	}
+	if !legacy {
+		return nil
+	}
+	tx, err := db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+	if _, err = tx.Exec(`ALTER TABLE shares RENAME TO shares_legacy;` + shareSchema + `
+ INSERT INTO shares(token,password_hash,created_at,expires_at) SELECT token,password_hash,created_at,expires_at FROM shares_legacy;
+ INSERT INTO share_items(share_token,item_id,path) SELECT token,0,path FROM shares_legacy;
+ DROP TABLE shares_legacy;`); err != nil {
+		return err
+	}
+	return tx.Commit()
+}