Implement login

server/.vscode/launch.json

@@ -0,0 +1,23 @@
+{
+	// Use IntelliSense to learn about possible attributes.
+	// Hover to view descriptions of existing attributes.
+	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"name": "Python: Flask",
+			"type": "python",
+			"request": "launch",
+			"module": "flask",
+			"env": {
+				"FLASK_APP": "server.py",
+				"FLASK_ENV": "development"
+			},
+			"args": [
+				"run",
+				"--no-debugger"
+			],
+			"jinja": true
+		}
+	]
+}

server/Dockerfile

@@ -10,4 +10,4 @@ RUN pipenv install
 COPY . .
 
 EXPOSE 5000
-CMD [ "pipenv", "run", "gunicorn", "-b", "0.0.0.0:5000", "server:app" ]
+CMD [ "pipenv", "run", "gunicorn", "-b", "0.0.0.0:5000", "--access-logfile", "-", "server:app" ]

server/Pipfile

@@ -6,6 +6,8 @@ name = "pypi"
 [packages]
 flask = "*"
 gunicorn = "*"
+pyotp = "*"
+flask-cors = "*"
 
 [dev-packages]
 

server/Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "8886b8a6c0d31987ddea5b9e25bd02f7891650c967351486fd3cf0fd4d16271e"
+            "sha256": "2ba252d63658abd009170d14705593521c57c99f82b643fcf232eeb51be35d10"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -32,6 +32,14 @@
             "index": "pypi",
             "version": "==2.0.2"
         },
+        "flask-cors": {
+            "hashes": [
+                "sha256:74efc975af1194fc7891ff5cd85b0f7478be4f7f59fe158102e91abb72bb4438",
+                "sha256:b60839393f3b84a0f3746f6cdca56c1ad7426aa738b70d6c61375857823181de"
+            ],
+            "index": "pypi",
+            "version": "==3.0.10"
+        },
         "gunicorn": {
             "hashes": [
                 "sha256:9dcc4547dbb1cb284accfb15ab5667a0e5d1881cc443e0677b4882a4067a807e",
@@ -131,13 +139,29 @@
             "markers": "python_version >= '3.6'",
             "version": "==2.0.1"
         },
+        "pyotp": {
+            "hashes": [
+                "sha256:9d144de0f8a601d6869abe1409f4a3f75f097c37b50a36a3bf165810a6e23f28",
+                "sha256:d28ddfd40e0c1b6a6b9da961c7d47a10261fb58f378cb00f05ce88b26df9c432"
+            ],
+            "index": "pypi",
+            "version": "==2.6.0"
+        },
         "setuptools": {
             "hashes": [
-                "sha256:b4c634615a0cf5b02cf83c7bedffc8da0ca439f00e79452699454da6fbd4153d",
-                "sha256:feb5ff19b354cde9efd2344ef6d5e79880ce4be643037641b49508bbb850d060"
+                "sha256:6d10741ff20b89cd8c6a536ee9dc90d3002dec0226c78fb98605bfb9ef8a7adf",
+                "sha256:d144f85102f999444d06f9c0e8c737fd0194f10f2f7e5fdb77573f6e2fa4fad0"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==59.4.0"
+            "version": "==59.5.0"
+        },
+        "six": {
+            "hashes": [
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.16.0"
         },
         "werkzeug": {
             "hashes": [

server/db.py

@@ -4,7 +4,9 @@ from flask import current_app, g
 
 DB_FILE = './data/db.sqlite'
 
-def get():
+get_return = sqlite3.Connection
+
+def get() -> get_return:
     if 'db' not in g:
         g.db = sqlite3.connect(
             DB_FILE,

server/db_utils.py

@@ -0,0 +1,24 @@
+from functools import wraps
+
+import db
+import models
+
+def get_db(fn):
+    @wraps(fn)
+    def wrapper(*args, **kargs):
+        return fn(db.get(), *args, **kargs)
+    return wrapper
+
+@get_db
+def get_user(db: db.get_return, username: str|None = None, user_id: int|None = None) -> models.User | None:
+    cur = db.cursor()
+    if username is not None:
+        cur.execute('select * from users where username=?', (username,))
+    elif user_id is not None:
+        cur.execute('select * from users where id=?', (user_id,))
+    else:
+        raise Exception('Neither username or user_id passed')
+    result = cur.fetchone()
+    if result is None:
+        return None
+    return models.User.from_query(result)

server/login.py

@@ -0,0 +1,54 @@
+from functools import wraps
+from flask import Blueprint, request
+
+from pyotp import TOTP
+
+import db_utils
+import models
+import ram_db
+import returns
+
+login = Blueprint('login', __name__)
+
+@login.post('/')
+def make_login():
+    try:
+        username = request.json['username']
+        code = request.json['code']
+    except (TypeError, KeyError):
+        return returns.INVALID_REQUEST
+
+    user: models.User | None = db_utils.get_user(username=username)
+    if user is None:
+        return returns.INVALID_DETAILS
+
+    otp = TOTP(user.otp)
+    if not otp.verify(code, valid_window=1):
+        return returns.INVALID_DETAILS
+
+    token = ram_db.login_user(user.id)
+    return returns.success(token=token)
+
+def ensure_logged_in(fn):
+    @wraps(fn)
+    def wrapper(*args, **kargs):
+        token = request.headers.get('Authorization', None)
+        if token is None:
+            return returns.NO_AUTHORIZATION
+        if not token.startswith('Bearer '):
+            return returns.INVALID_AUTHORIZATION
+        token = token[7:]
+        user_id = ram_db.get_user(token)
+        if user_id is None:
+            return returns.INVALID_AUTHORIZATION
+        return fn(user_id=user_id, *args, **kargs)
+    return wrapper
+
+@login.get('/whoami')
+@ensure_logged_in
+def whoami(user_id):
+    user: models.User | None = db_utils.get_user(user_id=user_id)
+    if user is not None:
+        user = user.to_json()
+
+    return returns.success(user=user)

server/models.py

@@ -0,0 +1,25 @@
+from dataclasses import dataclass
+
+@dataclass
+class User:
+    id: int
+    username: str
+    email: str
+    otp: str
+    fullname: str
+
+    def to_json(self, include_otp=False, include_id=False):
+        result = {
+            'username': self.username,
+            'email': self.email,
+            'fullname': self.fullname,
+        }
+        if include_id:
+            result['id'] = self.id
+        if include_otp:
+            result['otp'] = self.otp
+        return result
+
+    @classmethod
+    def from_query(cls, query_result):
+        return cls(*query_result)

server/ram_db.py

@@ -0,0 +1,30 @@
+from datetime import datetime, timedelta
+from types import TracebackType
+from uuid import uuid4
+
+USED_TOKENS = set()
+LOGGED_IN_USERS: dict[str, (int, datetime)] = {}
+
+def login_user(user_id: int) -> str:
+    '''
+    Creates token for user
+    '''
+    token = str(uuid4())
+    while token in USED_TOKENS:
+        token = str(uuid4())
+    if len(USED_TOKENS) > 10_000_000:
+        USED_TOKENS.clear()
+    USED_TOKENS.add(token)
+    LOGGED_IN_USERS[token] = user_id, datetime.now()
+    return token
+
+def get_user(token: str) -> int | None:
+    if token not in LOGGED_IN_USERS:
+        return None
+
+    user_id, login_date = LOGGED_IN_USERS[token]
+    time_since_login: timedelta = datetime.now() - login_date
+    if time_since_login.total_seconds() > (60 * 30): # 30 mins
+        del LOGGED_IN_USERS[token]
+        return None
+    return user_id

server/returns.py

@@ -0,0 +1,46 @@
+from http import HTTPStatus as _HTTPStatus
+
+def _make_error(http_status, code: str):
+    try:
+        http_status = http_status[0]
+    except Exception:
+        pass
+
+    return {
+        'status': 'error',
+        'code': code,
+    }, http_status
+
+# General
+
+INVALID_REQUEST = _make_error(
+    _HTTPStatus.BAD_REQUEST,
+    'general/invalid_request',
+)
+
+# Login
+
+INVALID_DETAILS = _make_error(
+    _HTTPStatus.UNAUTHORIZED,
+    'login/invalid_details',
+)
+
+NO_AUTHORIZATION = _make_error(
+    _HTTPStatus.UNAUTHORIZED,
+    'login/no_authorization',
+)
+
+INVALID_AUTHORIZATION = _make_error(
+    _HTTPStatus.UNAUTHORIZED,
+    'login/invalid_authorization',
+)
+
+# Success
+
+def success(http_status=_HTTPStatus.OK, /, **kargs):
+    try:
+        http_status = http_status[0]
+    except Exception:
+        pass
+
+    return dict(kargs, status='success'), http_status

server/server.py

@@ -1,10 +1,14 @@
 from flask import Flask
+from flask_cors import CORS
 
 import db
 
 app = Flask(__name__)
+CORS(app)
 db.init_app(app)
 
-@app.get('/')
-def root():
-    return 'Hello from FoxBank!'
+from login import login
+app.register_blueprint(login, url_prefix='/login')
+
+if __name__ == '__main__':
+    app.run()