add HTTP header parsing

tests/test_validation_header.py

@@ -0,0 +1,56 @@
+from aiohttp import web
+from aiohttp_pydantic import PydanticView
+from datetime import datetime
+import json
+
+
+class JSONEncoder(json.JSONEncoder):
+
+    def default(self, o):
+        if isinstance(o, datetime):
+            return o.isoformat()
+
+        return json.JSONEncoder.default(self, o)
+
+
+class ArticleView(PydanticView):
+
+    async def get(self, *, signature_expired: datetime):
+        return web.json_response({'signature': signature_expired}, dumps=JSONEncoder().encode)
+
+
+async def test_get_article_without_required_header_should_return_an_error_message(aiohttp_client, loop):
+    app = web.Application()
+    app.router.add_view('/article', ArticleView)
+
+    client = await aiohttp_client(app)
+    resp = await client.get('/article', headers={})
+    assert resp.status == 400
+    assert resp.content_type == 'application/json'
+    assert await resp.json() == [{'loc': ['signature_expired'],
+                                  'msg': 'field required',
+                                  'type': 'value_error.missing'}]
+
+
+async def test_get_article_with_wrong_header_type_should_return_an_error_message(aiohttp_client, loop):
+    app = web.Application()
+    app.router.add_view('/article', ArticleView)
+
+    client = await aiohttp_client(app)
+    resp = await client.get('/article', headers={'signature_expired': 'foo'})
+    assert resp.status == 400
+    assert resp.content_type == 'application/json'
+    assert await resp.json() == [{'loc': ['signature_expired'],
+                                  'msg': 'invalid datetime format',
+                                  'type': 'value_error.datetime'}]
+
+
+async def test_get_article_with_valid_header_should_return_the_parsed_type(aiohttp_client, loop):
+    app = web.Application()
+    app.router.add_view('/article', ArticleView)
+
+    client = await aiohttp_client(app)
+    resp = await client.get('/article', headers={'signature_expired': '2020-10-04T18:01:00'})
+    assert resp.status == 200
+    assert resp.content_type == 'application/json'
+    assert await resp.json() == {'signature': '2020-10-04T18:01:00'}

tests/test_validation_query_string.py

@@ -34,7 +34,7 @@ async def test_get_article_with_wrong_qs_type_should_return_an_error_message(aio
                                   'type': 'type_error.bool'}]
 
 
-async def test_get_article_with_valide_qs_should_return_the_parsed_type(aiohttp_client, loop):
+async def test_get_article_with_valid_qs_should_return_the_parsed_type(aiohttp_client, loop):
     app = web.Application()
     app.router.add_view('/article', ArticleView)