backend_and_cms/backend/app/utils.py

import os
import logging
import boto3
from botocore.exceptions import ClientError
from dataclasses import dataclass
from datetime import datetime, timedelta, timezone
from pathlib import Path
from typing import Any
from uuid import uuid4
from PIL import Image, ImageTk
import emails  # type: ignore
import jwt
from jinja2 import Template
from jwt.exceptions import InvalidTokenError
import filetype
from app.core.config import settings

static = 'static'
@dataclass
class EmailData:
    html_content: str
    subject: str


def render_email_template(*, template_name: str, context: dict[str, Any]) -> str:
    template_str = (
        Path(__file__).parent / "email-templates" / "build" / template_name
    ).read_text()
    html_content = Template(template_str).render(context)
    return html_content


def send_email(
    *,
    email_to: str,
    subject: str = "",
    html_content: str = "",
) -> None:
    assert settings.emails_enabled, "no provided configuration for email variables"
    message = emails.Message(
        subject=subject,
        html=html_content,
        mail_from=(settings.EMAILS_FROM_NAME, settings.EMAILS_FROM_EMAIL),
    )
    smtp_options = {"host": settings.SMTP_HOST, "port": settings.SMTP_PORT}
    if settings.SMTP_TLS:
        smtp_options["tls"] = True
    elif settings.SMTP_SSL:
        smtp_options["ssl"] = True
    if settings.SMTP_USER:
        smtp_options["user"] = settings.SMTP_USER
    if settings.SMTP_PASSWORD:
        smtp_options["password"] = settings.SMTP_PASSWORD
    response = message.send(to=email_to, smtp=smtp_options)
    logging.info(f"send email result: {response}")


def generate_test_email(email_to: str) -> EmailData:
    project_name = settings.PROJECT_NAME
    subject = f"{project_name} - Test email"
    html_content = render_email_template(
        template_name="test_email.html",
        context={"project_name": settings.PROJECT_NAME, "email": email_to},
    )
    return EmailData(html_content=html_content, subject=subject)


def generate_reset_password_email(email_to: str, email: str, token: str) -> EmailData:
    project_name = settings.PROJECT_NAME
    subject = f"{project_name} - Password recovery for user {email}"
    link = f"{settings.server_host}/reset-password?token={token}"
    html_content = render_email_template(
        template_name="reset_password.html",
        context={
            "project_name": settings.PROJECT_NAME,
            "username": email,
            "email": email_to,
            "valid_hours": settings.EMAIL_RESET_TOKEN_EXPIRE_HOURS,
            "link": link,
        },
    )
    return EmailData(html_content=html_content, subject=subject)


def generate_new_account_email(
    email_to: str, username: str, password: str
) -> EmailData:
    project_name = settings.PROJECT_NAME
    subject = f"{project_name} - New account for user {username}"
    html_content = render_email_template(
        template_name="new_account.html",
        context={
            "project_name": settings.PROJECT_NAME,
            "username": username,
            "password": password,
            "email": email_to,
            "link": settings.server_host,
        },
    )
    return EmailData(html_content=html_content, subject=subject)


def generate_password_reset_token(email: str) -> str:
    delta = timedelta(hours=settings.EMAIL_RESET_TOKEN_EXPIRE_HOURS)
    now = datetime.now(timezone.utc)
    expires = now + delta
    exp = expires.timestamp()
    encoded_jwt = jwt.encode(
        {"exp": exp, "nbf": now, "sub": email},
        settings.SECRET_KEY,
        algorithm="HS256",
    )
    return encoded_jwt


def verify_password_reset_token(token: str) -> str | None:
    try:
        decoded_token = jwt.decode(token, settings.SECRET_KEY, algorithms=["HS256"])
        return str(decoded_token["sub"])
    except InvalidTokenError:
        return None
    
from fastapi import HTTPException, status
from typing import IO
import filetype


def validate_file_size_type(file: IO):
    FILE_SIZE = 5097152 # 2MB

    accepted_file_types = ["image/png", "image/jpeg", "image/jpg", "image/heic", "image/heif", "image/heics", "png",
                          "jpeg", "jpg", "heic", "heif", "heics" 
                          ] 
    file_info = filetype.guess(file.file)
    if file_info is None:
        raise HTTPException(
            status_code=status.HTTP_415_UNSUPPORTED_MEDIA_TYPE,
            detail="Unable to determine file type",
        )

    detected_content_type = file_info.extension.lower()

    if (
        file.content_type not in accepted_file_types
        or detected_content_type not in accepted_file_types
    ):
        raise HTTPException(
            status_code=status.HTTP_415_UNSUPPORTED_MEDIA_TYPE,
            detail="Unsupported file type",
        )

    real_file_size = 0
    for chunk in file.file:
        real_file_size += len(chunk)
        if real_file_size > FILE_SIZE:
            raise HTTPException(status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE, detail="Too large")
    
# async def save_picture(file, folderName: str = '', fileName: str = None):
#     randon_uid = str(uuid4())
#     _, f_ext = os.path.splitext(file.filename)
    
#     picture_name = (randon_uid if fileName==None else fileName.lower().replace(' ', '')) + f_ext 

#     path = os.path.join(static,folderName)
#     if not os.path.exists(path):
#         os.makedirs(path)
        
#     picture_path = os.path.join(path,picture_name)

#     #output_size = (125,125)
#     img = Image.open(file.file)
    
#     #img.thumbnail(output_size)
#     img.save(picture_path)
    
#     return f'{static}/{folderName}/{picture_name}'

async def save_picture(file, folderName: str = "", fileName: str = None):
    random_uid = str(uuid4())
    _, f_ext = os.path.splitext(file.filename)

    picture_name = (fileName.lower().replace(" ", "") if fileName else random_uid) + f_ext

    r2 = boto3.client(
        "s3",
        endpoint_url=f"https://{settings.AccountID}.r2.cloudflarestorage.com",
        aws_access_key_id=settings.access_key_id,
        aws_secret_access_key=settings.secret_access_key,
    )

    img = Image.open(file.file)
    img_byte_arr = io.BytesIO()
    img.save(img_byte_arr, format='PNG')
    img_byte_arr = img_byte_arr.getvalue()

    r2.put_object(Bucket=settings.bucket_name, Key=f"{folderName}/{picture_name}", Body=img_byte_arr)

    r2_url = f"https://{settings.AccountID}.r2.cloudflarestorage.com/{settings.bucket_name}/{folderName}/{picture_name}"
    return r2_url


async def del_picture(picture_path):
    try:
        os.remove(picture_path)
    except Exception as e:
        print('Error: ', e)
        return False
    return True