1 files changed, 162 insertions, 0 deletions
diff --git a/gn3/authentication.py b/gn3/authentication.py
new file mode 100644
index 0000000..6719631
--- /dev/null
+++ b/gn3/authentication.py
@@ -0,0 +1,162 @@
+"""Methods for interacting with gn-proxy."""
+import functools
+import json
+import uuid
+import datetime
+
+from urllib.parse import urljoin
+from enum import Enum, unique
+from typing import Dict, List, Optional, Union
+
+from redis import Redis
+import requests
+
+
+@functools.total_ordering
+class OrderedEnum(Enum):
+    """A class that ordered Enums in order of position"""
+    @classmethod
+    @functools.lru_cache(None)
+    def _member_list(cls):
+        return list(cls)
+
+    def __lt__(self, other):
+        if self.__class__ is other.__class__:
+            member_list = self.__class__._member_list()
+            return member_list.index(self) < member_list.index(other)
+        return NotImplemented
+
+
+@unique
+class DataRole(OrderedEnum):
+    """Enums for Data Access"""
+    NO_ACCESS = "no-access"
+    VIEW = "view"
+    EDIT = "edit"
+
+
+@unique
+class AdminRole(OrderedEnum):
+    """Enums for Admin status"""
+    NOT_ADMIN = "not-admin"
+    EDIT_ACCESS = "edit-access"
+    EDIT_ADMINS = "edit-admins"
+
+
+def get_user_membership(conn: Redis, user_id: str,
+                        group_id: str) -> Dict:
+    """Return a dictionary that indicates whether the `user_id` is a
+    member or admin of `group_id`.
+
+    Args:
+      - conn: a Redis Connection with the responses decoded.
+      - user_id: a user's unique id
+        e.g. '8ad942fe-490d-453e-bd37-56f252e41603'
+      - group_id: a group's unique id
+      e.g. '7fa95d07-0e2d-4bc5-b47c-448fdc1260b2'
+
+    Returns:
+      A dict indicating whether the user is an admin or a member of
+      the group: {"member": True, "admin": False}
+
+    """
+    results = {"member": False, "admin": False}
+    for key, value in conn.hgetall('groups').items():
+        if key == group_id:
+            group_info = json.loads(value)
+            if user_id in group_info.get("admins"):
+                results["admin"] = True
+            if user_id in group_info.get("members"):
+                results["member"] = True
+            break
+    return results
+
+
+def get_highest_user_access_role(
+        resource_id: str,
+        user_id: str,
+        gn_proxy_url: str = "http://localhost:8080") -> Dict:
+    """Get the highest access roles for a given user
+
+    Args:
+      - resource_id: The unique id of a given resource.
+      - user_id: The unique id of a given user.
+      - gn_proxy_url: The URL where gn-proxy is running.
+
+    Returns:
+      A dict indicating the highest access role the user has.
+
+    """
+    role_mapping: Dict[str, Union[DataRole, AdminRole]] = {}
+    for data_role, admin_role in zip(DataRole, AdminRole):
+        role_mapping.update({data_role.value: data_role, })
+        role_mapping.update({admin_role.value: admin_role, })
+    access_role = {}
+    response = requests.get(urljoin(gn_proxy_url,
+                                    ("available?resource="
+                                     f"{resource_id}&user={user_id}")))
+    for key, value in json.loads(response.content).items():
+        access_role[key] = max(map(lambda role: role_mapping[role], value))
+    return access_role
+
+
+def get_groups_by_user_uid(user_uid: str, conn: Redis) -> Dict:
+    """Given a user uid, get the groups in which they are a member or admin of.
+
+    Args:
+      - user_uid: A user's unique id
+      - conn: A redis connection
+
+    Returns:
+      - A dictionary containing the list of groups the user is part of e.g.:
+        {"admin": [], "member": ["ce0dddd1-6c50-4587-9eec-6c687a54ad86"]}
+    """
+    admin = []
+    member = []
+    for uuid, group_info in conn.hgetall("groups").items():
+        group_info = json.loads(group_info)
+        group_info["uuid"] = uuid
+        if user_uid in group_info.get('admins'):
+            admin.append(group_info)
+        if user_uid in group_info.get('members'):
+            member.append(group_info)
+    return {
+        "admin": admin,
+        "member": member,
+    }
+
+
+def get_user_info_by_key(key: str, value: str,
+                         conn: Redis) -> Optional[Dict]:
+    """Given a key, get a user's information if value is matched"""
+    if key != "user_id":
+        for uuid, user_info in conn.hgetall("users").items():
+            user_info = json.loads(user_info)
+            if (key in user_info and
+                user_info.get(key) == value):
+                user_info["user_id"] = uuid
+                return user_info
+    elif key == "user_id":
+        if user_info := conn.hget("users", value):
+            user_info = json.loads(user_info)
+            user_info["user_id"] = value
+            return user_info
+    return None
+
+
+def create_group(conn: Redis, group_name: Optional[str],
+                 admin_user_uids: List = [],
+                 member_user_uids: List = []) -> Optional[Dict]:
+    """Create a group given the group name, members and admins of that group."""
+    if group_name and bool(admin_user_uids + member_user_uids):
+        timestamp = datetime.datetime.utcnow().strftime('%b %d %Y %I:%M%p')
+        group = {
+            "id": (group_id := str(uuid.uuid4())),
+            "admins": admin_user_uids,
+            "members": member_user_uids,
+            "name": group_name,
+            "created_timestamp": timestamp,
+            "changed_timestamp": timestamp,
+        }
+        conn.hset("groups", group_id, json.dumps(group))
+        return group