add: provide backup archive feature

api/backup.py

@@ -0,0 +1,66 @@
+import shutil
+import zipfile
+from datetime import datetime
+
+from flask import Blueprint, send_file, jsonify
+import os
+from api import require_auth
+from db import get_db
+from db.models.Markdown import Markdown
+from db.models.Path import Path
+
+import logging
+logger = logging.getLogger(__name__)
+
+backup_bp = Blueprint('backup', __name__, url_prefix='/api/backup')
+@backup_bp.route('/', methods=['GET'])
+@require_auth(roles=['admin'])
+def get_backup():
+    try:
+        paths = {}
+        with get_db() as session:
+            pths = session.query(Path).all()
+            paths = {p.id : p for p in pths}
+        traverse(1, paths)
+        timestamp = datetime.now().strftime('%Y-%m-%d_%H-%M-%S')
+        archive = shutil.make_archive(base_name=timestamp, format='zip', root_dir='Root')
+
+        shutil.rmtree('Root')
+        return send_file(
+            archive,
+            as_attachment=True,
+            download_name=timestamp + '.zip',
+        )
+    except Exception as e:
+        logger.error(f"Failed to get backup: {e}")
+        return jsonify({"error": "failed to get backup"}), 500
+
+
+def create_and_cd(path_name):
+    if not os.path.exists(path_name) or not os.path.isdir(path_name):
+        os.makedirs(path_name)
+    os.chdir(path_name)
+
+def cd_back():
+    os.chdir('..')
+
+def traverse(path_id, paths):
+    current_path = paths[path_id]
+    if path_id == 1:
+        create_and_cd("Root")
+    else:
+        create_and_cd(current_path.name)
+    with open(".meta", "w") as meta_file:
+        meta_file.write(f"order: {current_path.order}\n")
+    with get_db() as session:
+        mds = session.query(Markdown).filter(Markdown.path_id == path_id).all()
+        for md in mds:
+            with open(f"{md.title}.md", "w") as md_file:
+                md_file.write(md.content)
+            with open(f"{md.title}.mdmeta", "w") as meta_file:
+                meta_file.write(f"created_at: {md.created_at}\n")
+                meta_file.write(f"order: {md.order}\n")
+        children = [c for c in paths.values() if c.parent_id == path_id]
+        for child in children:
+            traverse(child.id, paths)
+    cd_back()