custom_header(), custom_status(), custom_redirect(), refs #648

datasette/app.py

@@ -762,10 +762,42 @@ class DatasetteRouter(AsgiRouter):
             except TemplateNotFound:
                 template = None
             if template:
-                await asgi_send_html(
+                headers = {}
+                status = [200]
+
+                def custom_header(name, value):
+                    headers[name] = value
+                    return ""
+
+                def custom_status(code):
+                    status[0] = code
+                    return ""
+
+                def custom_redirect(location, code=302):
+                    status[0] = code
+                    headers["Location"] = location
+                    return ""
+
+                body = await self.ds.render_template(
+                    template,
+                    {
+                        "custom_header": custom_header,
+                        "custom_status": custom_status,
+                        "custom_redirect": custom_redirect,
+                    },
+                    view_name="page",
+                )
+                # Pull content-type out into separate parameter
+                content_type = "text/html"
+                matches = [k for k in headers if k.lower() == "content-type"]
+                if matches:
+                    content_type = headers[matches[0]]
+                await asgi_send(
                     send,
-                    await self.ds.render_template(template, view_name="page"),
+                    body,
-                    status=200,
+                    status=status[0],
+                    headers=headers,
+                    content_type=content_type,
                 )
             else:
                 await self.handle_500(

tests/test_custom_pages.py

@@ -0,0 +1,80 @@
+import pytest
+from .fixtures import make_app_client
+
+VIEW_NAME_PLUGIN = """
+from datasette import hookimpl
+
+@hookimpl
+def extra_template_vars(view_name):
+    return {
+        "view_name": view_name,
+    }
+"""
+
+
+@pytest.fixture(scope="session")
+def custom_pages_client(tmp_path_factory):
+    template_dir = tmp_path_factory.mktemp("page-templates")
+    extra_plugins = {"view_name.py": VIEW_NAME_PLUGIN}
+    pages_dir = template_dir / "pages"
+    pages_dir.mkdir()
+    (pages_dir / "about.html").write_text("ABOUT! view_name:{{ view_name }}", "utf-8")
+    (pages_dir / "202.html").write_text("{{ custom_status(202) }}202!", "utf-8")
+    (pages_dir / "headers.html").write_text(
+        '{{ custom_header("x-this-is-foo", "foo") }}FOO'
+        '{{ custom_header("x-this-is-bar", "bar") }}BAR',
+        "utf-8",
+    )
+    (pages_dir / "redirect.html").write_text(
+        '{{ custom_redirect("/example") }}', "utf-8"
+    )
+    (pages_dir / "redirect2.html").write_text(
+        '{{ custom_redirect("/example", 301) }}', "utf-8"
+    )
+    nested_dir = pages_dir / "nested"
+    nested_dir.mkdir()
+    (nested_dir / "nest.html").write_text("Nest!", "utf-8")
+    for client in make_app_client(
+        template_dir=str(template_dir), extra_plugins=extra_plugins
+    ):
+        yield client
+
+
+def test_custom_pages_view_name(custom_pages_client):
+    response = custom_pages_client.get("/about")
+    assert 200 == response.status
+    assert "ABOUT! view_name:page" == response.text
+
+
+def test_custom_pages_nested(custom_pages_client):
+    response = custom_pages_client.get("/nested/nest")
+    assert 200 == response.status
+    assert "Nest!" == response.text
+    response = custom_pages_client.get("/nested/nest2")
+    assert 404 == response.status
+
+
+def test_custom_status(custom_pages_client):
+    response = custom_pages_client.get("/202")
+    assert 202 == response.status
+    assert "202!" == response.text
+
+
+def test_custom_headers(custom_pages_client):
+    response = custom_pages_client.get("/headers")
+    assert 200 == response.status
+    assert "foo" == response.headers["x-this-is-foo"]
+    assert "bar" == response.headers["x-this-is-bar"]
+    assert "FOOBAR" == response.text
+
+
+def test_redirect(custom_pages_client):
+    response = custom_pages_client.get("/redirect", allow_redirects=False)
+    assert 302 == response.status
+    assert "/example" == response.headers["Location"]
+
+
+def test_redirect2(custom_pages_client):
+    response = custom_pages_client.get("/redirect2", allow_redirects=False)
+    assert 301 == response.status
+    assert "/example" == response.headers["Location"]

tests/test_html.py

@@ -1242,35 +1242,3 @@ def test_base_url_config(base_url, path):
                     "href_or_src": href,
                     "element_parent": str(el.parent),
                 }
-
-
-def test_custom_pages(tmpdir):
-    template_dir = tmpdir.mkdir("page-templates")
-    extra_plugins = {
-        "view_name.py": textwrap.dedent(
-            """
-    from datasette import hookimpl
-
-    @hookimpl
-    def extra_template_vars(view_name):
-        return {
-            "view_name": view_name,
-        }
-    """
-        )
-    }
-    pages_dir = template_dir.mkdir("pages")
-    (pages_dir / "about.html").write_text("ABOUT! view_name:{{ view_name }}", "utf-8")
-    nested_dir = pages_dir.mkdir("nested")
-    (nested_dir / "nest.html").write_text("Nest!", "utf-8")
-    for client in make_app_client(
-        template_dir=str(template_dir), extra_plugins=extra_plugins
-    ):
-        response = client.get("/about")
-        assert 200 == response.status
-        assert "ABOUT! view_name:page" == response.text
-        response = client.get("/nested/nest")
-        assert 200 == response.status
-        assert "Nest!" == response.text
-        response = client.get("/nested/nest2")
-        assert 404 == response.status