From d6037fc0986855c9b0f189a13a651ad7f18dee63 Mon Sep 17 00:00:00 2001
From: Zhiwei Liang <zhiwei@sinatra.ai>
Date: Wed, 7 Jul 2021 01:01:05 -0700
Subject: [PATCH] Initial version of Blueprint.copy, with a test case.

---
 sanic/blueprints.py          | 18 ++++++++++++++++++
 tests/test_blueprint_copy.py | 24 ++++++++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 tests/test_blueprint_copy.py

diff --git a/sanic/blueprints.py b/sanic/blueprints.py
index 1fa24e88..3afe9355 100644
--- a/sanic/blueprints.py
+++ b/sanic/blueprints.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 import asyncio
 
 from collections import defaultdict
+from copy import deepcopy
 from types import SimpleNamespace
 from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Set, Union
 
@@ -144,6 +145,23 @@ class Blueprint(BaseSanic):
         kwargs["apply"] = False
         return super().signal(event, *args, **kwargs)
 
+    def copy(
+        self,
+        name: str,
+        url_prefix: str = "",
+        version: Optional[Union[int, str, float]] = None,
+        strict_slashes: Optional[bool] = None,
+        version_prefix: str = "/v",
+    ):
+        new_bp = deepcopy(self)
+        new_bp.name = name
+        new_bp.url_prefix = url_prefix
+        new_bp.version = version
+        new_bp.strict_slashes = strict_slashes
+        new_bp.version_prefix = version_prefix
+
+        return new_bp
+
     @staticmethod
     def group(
         *blueprints,
diff --git a/tests/test_blueprint_copy.py b/tests/test_blueprint_copy.py
new file mode 100644
index 00000000..022c1160
--- /dev/null
+++ b/tests/test_blueprint_copy.py
@@ -0,0 +1,24 @@
+from copy import deepcopy
+
+from sanic import Blueprint, Sanic, blueprints, response
+from sanic.response import text
+
+
+def test_bp_copy(app: Sanic):
+    bp1 = Blueprint("test1", version=1)
+
+    @bp1.route("/page")
+    def handle_request(request):
+        return text("Hello world!")
+
+    bp2 = bp1.copy(name="test2", version=2)
+    assert id(bp1) != id(bp2)
+
+    app.blueprint(bp1)
+    app.blueprint(bp2)
+
+    _, response = app.test_client.get("/v1/page")
+    assert "Hello world!" in response.text
+
+    _, response = app.test_client.get("/v2/page")
+    assert "Hello world!" in response.text