fabriquedoc-backend/main.py

"""     
    Fabrique à documents
    Copyright (C) 2023  François Pelletier

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>. 
"""

from datetime import datetime, timedelta, timezone
import logging
from typing import Annotated

import jwt
from fastapi import FastAPI, UploadFile, Depends, HTTPException
from fastapi.responses import FileResponse
import pypandoc
import json

from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from fastapi.testclient import TestClient
import os
import shutil

from passlib.exc import InvalidTokenError
from starlette import status

from DocumentSpecs import DocumentSpecs
from FormatParameters import FormatParameters
from convert_pdf import convert_pdf
from convert_video import convert_video
from extract_emojis import replace_emojis
from list_dir import list_dir
from models import UserInDB, User, TokenData, Token
from responses import Styles, Formats, App

from passlib.context import CryptContext

SECRET_KEY = os.getenv("SECRET_KEY")
USERNAME = os.getenv("USERNAME")
PASS_HASH = os.getenv("PASS_HASH")
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 7  # 7 days

fake_users_db = {
    "francois": {
        "username": f"{USERNAME}",
        "hashed_password": f"{PASS_HASH}",
        "disabled": False,
    }
}

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
app = FastAPI()


def verify_password(plain_password, hashed_password):
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password):
    return pwd_context.hash(password)


def get_user(db, username: str):
    if username in db:
        user_dict = db[username]
        return UserInDB(**user_dict)


def authenticate_user(fake_db, username: str, password: str):
    user = get_user(fake_db, username)
    if not user:
        return False
    if not verify_password(password, user.hashed_password):
        return False
    return user


def create_access_token(data: dict, expires_delta: timedelta | None = None):
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.now(timezone.utc) + expires_delta
    else:
        expire = datetime.now(timezone.utc) + timedelta(minutes=15)
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt


async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        username: str = payload.get("sub")
        if username is None:
            raise credentials_exception
        token_data = TokenData(username=username)
    except InvalidTokenError:
        raise credentials_exception
    user = get_user(fake_users_db, username=token_data.username)
    if user is None:
        raise credentials_exception
    return user


async def get_current_active_user(
        current_user: Annotated[User, Depends(get_current_user)],
):
    if current_user.disabled:
        raise HTTPException(status_code=400, detail="Inactive user")
    return current_user


@app.post("/token/")
async def login_for_access_token(
        form_data: Annotated[OAuth2PasswordRequestForm, Depends()],
) -> Token:
    user = authenticate_user(fake_users_db, form_data.username, form_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )
    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        data={"sub": user.username}, expires_delta=access_token_expires
    )
    return Token(access_token=access_token, token_type="bearer")


@app.get("/users/me")
async def read_users_me(
        current_user: Annotated[User, Depends(get_current_active_user)],
):
    return current_user


@app.get("/")
async def get_root():
    app = App(app='fabriquedoc')
    return app


@app.get("/styles/")
async def get_styles(current_user: Annotated[User, Depends(get_current_active_user)]):
    styles = Styles(styles=list_dir("./styles"))
    return styles


@app.get("/formats/{style}/")
async def get_formats(style: str, current_user: Annotated[User, Depends(get_current_active_user)]):
    formats = Formats(formats=list_dir(f"./styles/{style}/"))
    return formats


@app.get("/format_parameters/{style}/{format}/")
async def get_format_parameters(style: str, format: str, current_user: Annotated[User, Depends(get_current_active_user)]):
    # open styles/format_parameters.json as a dictionary
    with open(f"./styles/{style}/format_parameters.json", "r") as f:
        format_data = json.load(f).get(format)
        logging.log(logging.INFO, str(format_data))
        # load data from format_data into the FormatParameters object
        parameters = FormatParameters(**format_data)
    return parameters


@app.get("/images/")
async def get_images(current_user: Annotated[User, Depends(get_current_active_user)]):
    # list all files in resources/images
    files = [f for f in os.listdir("./resources/images") if os.path.isfile(os.path.join("./resources/images", f))]
    # sort the files
    files.sort()
    return {"images": files}


@app.get("/images/{nom_image}")
async def get_image(nom_image: str, current_user: Annotated[User, Depends(get_current_active_user)]):
    return FileResponse(f"./resources/images/{nom_image}")


@app.post("/images/")
async def ajouter_image(file: UploadFile, current_user: Annotated[User, Depends(get_current_active_user)]):
    """
    Add an image to the images folder.
    :param current_user:
    :param file:
    :return:
    """
    image_path = f"{os.getcwd()}/resources/images/{file.filename}"
    try:
        contents = file.file.read()
        with open(image_path, 'wb') as f:
            f.write(contents)
    except Exception as e:
        return {"message": f"There was an error uploading the file: {e}"}
    finally:
        file.file.close()

    return {"message": f"Successfully uploaded all files"}


@app.delete("/images/{nom_image}")
async def supprimer_image(nom_image: str, current_user: Annotated[User, Depends(get_current_active_user)]):
    """
    Delete an image from the images folder.
    :param current_user:
    :param nom_image:
    :return:
    """
    image_path = f"{os.getcwd()}/resources/images/{nom_image}"
    try:
        os.remove(image_path)
    except Exception as e:
        return {"message": f"There was an error deleting the file: {e}"}
    finally:
        return {"message": f"Successfully deleted {nom_image}"}


@app.post("/generer/")
async def generer(specs: DocumentSpecs, current_user: Annotated[User, Depends(get_current_active_user)]):
    header_file = f'{os.getcwd()}/styles/{specs.style}/{specs.format}/header.tex'
    cover_file = f'{os.getcwd()}/styles/{specs.style}/{specs.format}/cover.tex'
    datef = datetime.now().strftime("%Y-%m-%d")
    os.makedirs("out", exist_ok=True)
    filters = ['latex-emoji.lua', 'centered.lua']
    pdoc_args = [
        f'--include-in-header={header_file}',
        f'--include-after-body={cover_file}',
        '--listings',
        '--dpi=300',
        f'--toc-depth={specs.tocdepth}',
        f'--pdf-engine={specs.pdfengine}',
        f'--resource-path={os.getcwd()}/resources/',
        '-V', f'linkcolor={specs.linkcolor}',
        '-V', f'fontsize={specs.fontsize}pt',
        '-V', f'geometry:paperwidth={round(specs.paperwidth * specs.ratio / 100, -1) / 300}in',
        '-V', f'geometry:paperheight={round(specs.paperheight * specs.ratio / 100, -1) / 300}in',
        '-V', f'geometry:left={specs.margin / 300}in',
        '-V', f'geometry:right={specs.margin / 300}in',
        '-V', f'geometry:top={specs.vmargin / 300}in',
        '-V', f'geometry:bottom={specs.vmargin / 300}in'
    ]
    pdf_file_path = f"./out/{specs.style}-{specs.format}-{datef}-output.pdf"
    images_path = f"./out/{specs.style}-{specs.format}-{datef}-images"
    try:
        logging.info("Dossier courant = " + os.getcwd())

        text_to_convert = replace_emojis(specs.content)

        pypandoc.convert_text(source=text_to_convert,
                              to='pdf',
                              format='markdown+implicit_figures+smart+emoji',
                              encoding='utf-8',
                              extra_args=pdoc_args,
                              filters=filters,
                              cworkdir=os.getcwd(),
                              outputfile=pdf_file_path
                              )

    except RuntimeError as rerr:
        logging.exception(rerr)
    except OSError as oerr:
        logging.exception(oerr)
    if specs.extension in ["jpg", "mp4"]:
        filename = os.path.join("out", os.path.splitext(os.path.basename(pdf_file_path))[0])
        if not os.path.exists(images_path):
            os.mkdir(images_path)
        conversion_extension = specs.extension
        output_extension = specs.extension
        if specs.extension in ["mp4"]:
            conversion_extension = "jpg"
        try:
            convert_pdf(pdf_file_path,
                        conversion_extension,
                        images_path,
                        resolution=300)
            if specs.extension in ["jpg"]:
                shutil.make_archive(base_name=filename,
                                    format='zip',
                                    root_dir=images_path)
                output_extension = "zip"
                shutil.rmtree(images_path)
            if specs.extension in ["mp4"]:
                output_extension = "mp4"
                convert_video(images_path=images_path,
                              output_path=f"{filename}.{output_extension}",
                              width=specs.paperwidth,
                              height=specs.paperheight,
                              fps=specs.fps,
                              stilltime=specs.stilltime)
        except Exception as e:
            logging.exception(e)
        return FileResponse(f"{filename}.{output_extension}")
    elif specs.extension == "pdf":
        return FileResponse(pdf_file_path)
    else:
        return 0


client = TestClient(app)


def test_getroot():
    response = client.get("/")
    assert response.status_code == 200