Commit existing codebase

app/auth/dto.py

@@ -0,0 +1,10 @@
+from pydantic import BaseModel
+
+
+class Credentials(BaseModel):
+    username: str
+    password: str
+
+
+class TokenModel(BaseModel):
+    token: str

app/auth/handlers.py

@@ -0,0 +1,17 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app.auth.dto import Credentials, TokenModel
+from app.auth.service import authenticate
+from app.db import get_db
+
+router = APIRouter()
+
+
+@router.post("/auth", status_code=200, response_model=TokenModel)
+def issue_access_token(credentials: Credentials, db: Session = Depends(get_db)) -> TokenModel:
+    token = authenticate(credentials, db)
+    if token is None:
+        raise HTTPException(status_code=401)
+    else:
+        return TokenModel(token=token)

app/auth/middleware.py

@@ -0,0 +1,17 @@
+from fastapi import Depends, HTTPException
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from jose import JWTError
+
+from app.auth.service import verify_token
+from app.user.model import User
+from app.user.service import get_user_by_id
+from app.db import get_db
+
+
+def get_auth_user(auth: HTTPAuthorizationCredentials = Depends(HTTPBearer()), db=Depends(get_db)) -> User:
+    try:
+        decoded_token = verify_token(auth.credentials)
+        auth_user = get_user_by_id(db, int(decoded_token["sub"]))
+        return auth_user
+    except JWTError:
+        raise HTTPException(status_code=403, detail="Invalid token")

app/auth/service.py

@@ -0,0 +1,39 @@
+import os
+from datetime import datetime, timedelta
+from typing import Optional
+
+from jose import jwt
+from jose.constants import ALGORITHMS
+from sqlalchemy.orm import Session
+
+from app.auth.dto import Credentials
+from app.config import config
+from app.user.service import get_user_by_username, passwords_match
+
+JWT_SECRET = config["CGNO_ID_JWT_SECRET"]
+JWT_ISSUER = "Energia"
+
+
+def authenticate(credentials: Credentials, db: Session) -> Optional[str]:
+    user = get_user_by_username(db, credentials.username)
+    if passwords_match(user.password, credentials.password):
+        token = issue_token(user.id)
+        return token
+    else:
+        return None
+
+
+def issue_token(user_id: int) -> str:
+    now = datetime.utcnow()
+    claims = {
+        "sub": str(user_id),
+        "iss": JWT_ISSUER,
+        "iat": now,
+        "nbf": now,
+        "exp": now + timedelta(weeks=1)
+    }
+    return jwt.encode(claims, JWT_SECRET, algorithm=ALGORITHMS.HS256)
+
+
+def verify_token(token: str) -> dict:
+    return jwt.decode(token, JWT_SECRET, algorithms=ALGORITHMS.HS256, issuer=JWT_ISSUER)

app/config.py

@@ -0,0 +1,9 @@
+import os
+
+from dotenv import dotenv_values
+
+config = {
+    **dotenv_values(".env.dev"),
+    **dotenv_values(".env"),
+    **os.environ
+}

app/db.py

@@ -0,0 +1,21 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+from app.config import config
+
+DATABASE_URL = f"postgresql://{config['CGNO_ID_DB_USERNAME']}:{config['CGNO_ID_DB_PASSWORD']}@{config['CGNO_ID_DB_HOST']}/{config['CGNO_ID_DB_NAME']}"
+
+engine = create_engine(DATABASE_URL)
+
+session_factory = sessionmaker(bind=engine)
+
+EntityBase = declarative_base()
+
+
+def get_db():
+    db = session_factory()
+    try:
+        yield db
+    finally:
+        db.close()

app/main.py

@@ -0,0 +1,25 @@
+from fastapi import FastAPI, APIRouter
+from starlette.middleware.cors import CORSMiddleware
+
+from app.user.handlers import router as user_router
+from app.auth.handlers import router as auth_router
+
+
+def main_router() -> APIRouter:
+    router = APIRouter()
+    router.include_router(user_router, tags=["users"], prefix="/users")
+    router.include_router(auth_router, tags=["auth"])
+    return router
+
+
+app = FastAPI(title="cognio ID API")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"]
+)
+
+app.include_router(main_router())

app/migrations/env.py

@@ -0,0 +1,85 @@
+import pathlib
+import sys
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+sys.path.append(str(pathlib.Path(__file__).resolve().parents[2]))
+
+from app.db import DATABASE_URL
+from app.user.model import User
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = [User.metadata]
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+config.set_main_option("sqlalchemy.url", DATABASE_URL)
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

app/migrations/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

app/migrations/versions/646ae6f3e17a_initial.py

@@ -0,0 +1,41 @@
+"""Initial
+
+Revision ID: 646ae6f3e17a
+Revises: 
+Create Date: 2021-02-25 00:59:54.287382
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '646ae6f3e17a'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('users',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('username', sa.String(length=32), nullable=False),
+    sa.Column('email', sa.String(), nullable=False),
+    sa.Column('given_name', sa.String(length=32), nullable=False),
+    sa.Column('family_name', sa.String(length=32), nullable=True),
+    sa.Column('sex', sa.Enum('NOT_KNOWN', 'MALE', 'FEMALE', 'NOT_APPLICABLE', name='usersex'), nullable=False),
+    sa.Column('birthdate', sa.Date(), nullable=True),
+    sa.Column('password', sa.String(), nullable=False),
+    sa.Column('creation_date', sa.DateTime(), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('email'),
+    sa.UniqueConstraint('username')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('users')
+    # ### end Alembic commands ###

app/user/dto.py

@@ -0,0 +1,60 @@
+import calendar
+from datetime import datetime, date
+from typing import Optional
+
+from pydantic import BaseModel
+
+from app.user.model import User, Sex
+
+
+class UserCreationModel(BaseModel):
+    username: str
+    email: str
+    password: str
+    given_name: str
+    family_name: Optional[str]
+    sex: str
+    birthdate: Optional[int]
+
+    def to_entity(self) -> User:
+        birthdate = None
+
+        if self.birthdate is not None:
+            birthdate = date.fromtimestamp(self.birthdate)
+
+        return User(
+            username=self.username,
+            email=self.email,
+            password=self.password,
+            given_name=self.given_name,
+            family_name=self.family_name,
+            sex=Sex[self.sex],
+            birthdate=birthdate
+        )
+
+
+class UserResourceModel(BaseModel):
+    id: int
+    username: str
+    email: str
+    given_name: str
+    family_name: Optional[str]
+    sex: str
+    birthdate: Optional[int]
+
+    @staticmethod
+    def from_entity(user: User):
+        birthdate = None
+
+        if user.birthdate is not None:
+            birthdate = calendar.timegm(user.birthdate.timetuple())
+
+        return UserResourceModel(
+            id=user.id,
+            username=user.username,
+            email=user.email,
+            given_name=user.given_name,
+            family_name=user.family_name,
+            sex=user.sex.name,
+            birthdate=birthdate
+        )

app/user/handlers.py

@@ -0,0 +1,59 @@
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from starlette.responses import Response
+
+from app.auth.middleware import get_auth_user
+from app.user.dto import UserCreationModel, UserResourceModel
+from app.user.model import User
+import app.user.service as user_service
+from app.db import get_db
+
+router = APIRouter()
+
+
+@router.post("", status_code=201, response_model=UserResourceModel)
+async def create_user(model: UserCreationModel, db: Session = Depends(get_db)) -> UserResourceModel:
+    user = model.to_entity()
+    created_user = user_service.create_user(db, user)
+    return UserResourceModel.from_entity(created_user)
+
+
+@router.get("/{id}", status_code=200, response_model=UserResourceModel)
+async def get_user_by_id(
+    id: int,
+    auth_user: User = Depends(get_auth_user),
+    db: Session = Depends(get_db)
+) -> UserResourceModel:
+    check_access(auth_user, id)
+
+    user = user_service.get_user_by_id(db, id)
+
+    if user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+
+    return UserResourceModel.from_entity(user)
+
+
+@router.delete("/{id}", status_code=204)
+async def delete_user_by_id(
+    id: int,
+    auth_user: User = Depends(get_auth_user),
+    db: Session = Depends(get_db)
+):
+    check_access(auth_user, id)
+
+    user_service.delete_user_by_id(db, id)
+    return Response(status_code=204)
+
+
+def check_access(auth_user: User, param: Any):
+    access_exception = HTTPException(status_code=403, detail="Forbidden")
+
+    if type(param) is int:
+        if not (auth_user.id == param):
+            raise access_exception
+    elif type(param) is User:
+        if not ((auth_user.username == param.username) and (auth_user.email == param.email)):
+            raise access_exception

app/user/model.py

@@ -0,0 +1,29 @@
+import enum
+from datetime import datetime
+
+from sqlalchemy import Column, String, Integer, DateTime, Enum, Date
+
+from app.db import EntityBase
+
+
+class Sex(enum.Enum):
+    """Human sex according to ISO/IEC 5218."""
+
+    NOT_KNOWN = 0,
+    MALE = 1,
+    FEMALE = 2,
+    NOT_APPLICABLE = 9
+
+
+class User(EntityBase):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True)
+    username = Column(String(length=32), unique=True, nullable=False)
+    email = Column(String, unique=True, nullable=False)
+    password = Column(String, nullable=False)
+    given_name = Column(String(length=32), nullable=False)
+    family_name = Column(String(length=32))
+    sex = Column(Enum(Sex), nullable=False, default=Sex.NOT_KNOWN)
+    birthdate = Column(Date)
+    creation_date = Column(DateTime, nullable=False, default=datetime.utcnow())

app/user/service.py

@@ -0,0 +1,42 @@
+from typing import Optional
+
+from passlib.context import CryptContext
+from sqlalchemy.orm import Session
+
+from app.user.model import User
+
+pwd_context = CryptContext(schemes=["bcrypt"])
+
+
+def create_user(db: Session, user: User) -> User:
+    if get_user_by_username_or_email(db, user.username, user.email) is not None:
+        raise Exception()
+
+    user.password = pwd_context.hash(user.password)
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+    return user
+
+
+def get_user_by_id(db: Session, id: int) -> Optional[User]:
+    return db.query(User).filter(User.id == id).one_or_none()
+
+
+def get_user_by_username(db: Session, username: str) -> Optional[User]:
+    return db.query(User).filter(User.username == username).one_or_none()
+
+
+def get_user_by_username_or_email(db: Session, username: str, email: str) -> Optional[User]:
+    return db.query(User).filter(User.username == username, User.email == email).one_or_none()
+
+
+def delete_user_by_id(db: Session, id: int):
+    user = get_user_by_id(db, id)
+    if user is not None:
+        db.delete(user)
+        db.commit()
+
+
+def passwords_match(hashed: str, raw: str) -> bool:
+    return pwd_context.verify(raw, hashed)