add: markdown search feature

api/markdown.py

@@ -1,4 +1,5 @@
 from flask import Blueprint, request, jsonify
+from sqlalchemy import or_
 
 import api
 from api import require_auth, etag_response
@@ -153,3 +154,11 @@ def move_backward(markdown_id):
         session.commit()
         return jsonify(markdown.to_dict()), 200
 
+@markdown_bp.route('/search/<string:keyword>', methods=['GET'])
+@limiter.limit(api.get_rate_limit)
+def search_markdowns(keyword):
+    with (get_db() as session):
+        res = session.query(Markdown).filter(
+            or_(Markdown.title.like(keyword), Markdown.content.like(keyword))
+        ).all()
+        return jsonify([md.to_dict() for md in res]), 200