Add get_permissions() method to list all permissions on server

Fix README param

README.rst

@@ -196,6 +196,19 @@ The objects permissions can be specified or modified by passing a ``permissions`
     client.update_record(data=record)
 
 
+In order to obtain a list of all the permissions, on every object, use the ``get_permissions()`` method:
+
+.. code-block:: python
+
+    all_perms = client.get_permissions(exclude_resource_names=("record",))
+
+    has_collection_perms = any(
+        p for p in all_perms
+        if p["collection_id"] == "my-collection"
+        and "write" in p["permissions"]
+    )
+
+
 Get or create
 -------------
 

src/kinto_http/client.py

@@ -667,6 +667,16 @@ def get_paginated_records(self, *, collection=None, bucket=None, **kwargs) -> Li
 
         return self._paginated_generator(endpoint, **kwargs)
 
+    @retry_timeout
+    def get_permissions(self, exclude_resource_names=None, **kwargs):
+        endpoint = self._get_endpoint("permissions")
+        params = kwargs.setdefault("params", {})
+        params.setdefault("_sort", "id")
+        if exclude_resource_names:
+            params["exclude_resource_name"] = ",".join(exclude_resource_names)
+        body, _ = self.session.request("get", endpoint, **kwargs)
+        return body["data"]
+
     def _paginated_generator(self, endpoint, *, if_none_match=None, **kwargs):
         headers = {}
         if if_none_match is not None:

src/kinto_http/endpoints.py

@@ -11,6 +11,7 @@ class Endpoints(object):
     endpoints = {
         "root": "{root}/",
         "batch": "{root}/batch",
+        "permissions": "{root}/permissions",
         "buckets": "{root}/buckets",
         "bucket": "{root}/buckets/{bucket}",
         "history": "{root}/buckets/{bucket}/history",

tests/config/kinto.ini

@@ -16,6 +16,8 @@ kinto.bucket_create_principals = account:user
 
 kinto.attachment.base_path = /tmp
 
+kinto.experimental_permissions_endpoint = true
+
 [server:main]
 use = egg:waitress#main
 host = 0.0.0.0

tests/test_client.py

@@ -1414,3 +1414,22 @@ def test_add_attachment_guesses_mimetype(record_setup: Client, tmp_path):
         permissions=None,
         files=[("attachment", ("file.txt", b"hello", "text/plain"))],
     )
+
+
+def test_get_permissions(client_setup: Client):
+    client = client_setup
+    mock_response(client.session)
+
+    client.get_permissions()
+    url = "/permissions"
+    client.session.request.assert_called_with("get", url, params={"_sort": "id"})
+
+    client.get_permissions(exclude_resource_names=("record", "group"))
+    client.session.request.assert_called_with(
+        "get",
+        url,
+        params={
+            "exclude_resource_name": "record,group",
+            "_sort": "id",
+        },
+    )

tests/test_functional.py

@@ -582,3 +582,11 @@ def test_removing_an_attachment(functional_setup, tmp_path):
 
     record = client.get_record(id="abc")
     assert record["data"]["attachment"] is None
+
+
+def test_get_permissions(functional_setup):
+    client = functional_setup
+    perms = client.get_permissions()
+
+    perms_by_uri = {p["uri"]: p for p in perms}
+    assert perms_by_uri["/accounts/user"]["permissions"] == ["read", "write"]