diff --git a/.gitignore b/.gitignore
index ee11984..c134ff3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -129,4 +129,6 @@ dmypy.json
 .pyre/
 
 # Del .idea
-.idea/
\ No newline at end of file
+.idea/
+
+test*.py
\ No newline at end of file
diff --git a/gitflic/__init__.py b/gitflic/__init__.py
index e69de29..41bff03 100644
--- a/gitflic/__init__.py
+++ b/gitflic/__init__.py
@@ -0,0 +1,2 @@
+from .api import Gitflic
+from .auth import GitflicAuthScopes, GitflicAuth
diff --git a/gitflic/api.py b/gitflic/api.py
index 5041b69..443ea7e 100644
--- a/gitflic/api.py
+++ b/gitflic/api.py
@@ -1,6 +1,9 @@
+import requests
+
+API_URL = 'https://api.gitflic.ru/'
+
 
 class Gitflic:
 
     def __init__(self):
         pass
-    
\ No newline at end of file
diff --git a/gitflic/auth.py b/gitflic/auth.py
new file mode 100644
index 0000000..4e1f3de
--- /dev/null
+++ b/gitflic/auth.py
@@ -0,0 +1,97 @@
+from enum import Enum
+import logging
+from typing import Union
+import webbrowser
+import urllib.parse
+
+import requests
+
+from .exceptions import AuthError, GitflicExceptions
+
+oauth_url = "https://oauth.gitflic.ru/oauth/authorize?scope={}&clientId={}&redirectUrl={}&state={}"
+
+
+class GitflicAuthScopes(Enum):
+    USER_READ = "USER_READ"
+    USER_WRITE = "USER_WRITE"
+    PROJECT_READ = "PROJECT_READ"
+    PROJECT_WRITE = "PROJECT_WRITE"
+    PROJECT_EDIT = "PROJECT_EDIT"
+
+    ALL = "USER_READ,USER_WRITE,PROJECT_READ,PROJECT_WRITE,PROJECT_EDIT"
+
+
+class GitflicAuth:
+
+    # noinspection PyTypeChecker
+    def __init__(self,
+                 access_token: str = None,
+                 scope: Union[GitflicAuthScopes, str] = None,
+                 client_id: str = None,
+                 redirect_url: str = None,
+                 state: str = None):
+        """
+
+        :param access_token:
+        :param scope:
+        :param client_id:
+        :param redirect_url:
+        """
+
+        self.log: logging.Logger = logging.getLogger(__name__)
+
+        self.session: requests.Session = requests.Session()
+
+        self.access_token: str = access_token
+
+        self.scope: str = scope if not isinstance(scope, GitflicAuthScopes) else scope.value
+        self.client_id: str = client_id
+        self.redirect_url: str = redirect_url
+        self.state = state
+
+        self.refresh_token: str = None
+
+        if any((access_token, scope, client_id, redirect_url, state)):
+            if access_token:
+                pass
+            elif not (scope and client_id and redirect_url, state):
+                raise GitflicExceptions(
+                    "Cannot auth without 'scope', 'client_id', 'redirect_url', 'state' parameters. "
+                    "See doc: https://gitflic.ru/help/api/access-token."
+                )
+        else:
+            raise GitflicExceptions(
+                "Cannot auth without 'token' or 'scope' and 'client_id' and 'redirect_url' and 'state' parameters. "
+                "See doc: https://gitflic.ru/help/api/access-token."
+            )
+
+        self._login()
+
+    def _login(self):
+        self.log.debug("Trying to login.")
+
+        if self.access_token:
+            self.session.headers.update({"Authorization": "token " + self.access_token})
+        else:
+
+            raise GitflicExceptions("Oauth not ready. Use access_token.")
+
+            # redirect_url = urllib.parse.quote_plus(self.redirect_url)
+            # webbrowser.open(oauth_url.format(self.scope, self.client_id, redirect_url, self.state))
+            # url = input("Paste redirect url: ")
+            # r = self.session.get("").json()
+            # print(r)
+
+            # self.session.headers.update({"Authorization": "token " + "null"})
+
+        self.check_token()
+
+    def check_token(self):
+        self.log.debug("Check token.")
+        r = self.session.get("https://api.gitflic.ru/user/me")
+
+        if r.status_code == 403:
+            raise AuthError("Authentication failed.")
+        else:
+            r = r.json()
+            self.log.debug(f"Logged as {r.get('username')} {r.get('id')}")
diff --git a/gitflic/exceptions.py b/gitflic/exceptions.py
new file mode 100644
index 0000000..44fe072
--- /dev/null
+++ b/gitflic/exceptions.py
@@ -0,0 +1,22 @@
+class GitflicExceptions(Exception):
+    error_code: int = 1
+    reason: str = None
+    reason_ru: str = None
+
+
+class AuthError(GitflicExceptions):
+    error_code = 403
+    reason = None
+    reason_ru = None
+
+
+class NoRights(GitflicExceptions):
+    error_code = 403
+    reason = "Нет прав для доступа."
+    reason_ru = "There are no access rights."
+
+
+class NotFound(GitflicExceptions):
+    error_code = 404
+    reason = "No data was found for the query."
+    reason_ru = "Данные по запросу не найдены."