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server.py
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server.py
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import os
import logging
from datetime import datetime
from random import Random
import base64
from flask import Flask, render_template, request, jsonify
from flask_recaptcha import ReCaptcha
from flask_limiter import Limiter
from flask_limiter.util import get_remote_address
from sendgrid import SendGridAPIClient
from sendgrid.helpers.mail import (Mail, Attachment, FileContent, FileName, FileType, Disposition)
from dotenv import load_dotenv
load_dotenv()
class Config:
MAX_CONTENT_LENGTH = 15 * 1024 * 1024 # 15 MB
EMAIL_DOMAIN = "@ethereum.org"
DEFAULT_RECIPIENT_EMAIL = "kyc@ethereum.org"
NUMBER_OF_ATTACHMENTS = int(os.getenv('NUMBEROFATTACHMENTS', 10))
DEBUG_MODE = os.getenv('DEBUG', 'False').lower() == 'true'
SECRET_KEY = os.getenv('SECRET_KEY', 'you-should-set-a-secret-key')
def validate_env_vars(required_vars):
"""
Validates that all required environment variables are set.
"""
missing_vars = [var for var in required_vars if var not in os.environ]
if missing_vars:
raise EnvironmentError(f"Missing required environment variables: {', '.join(missing_vars)}")
def sanitize_filename(filename):
"""
Sanitizes the filename to prevent directory traversal and other issues.
"""
return filename.replace("..", "").replace("/", "").replace("\\", "")
def parse_form(form):
"""
Parses the form data to extract the message, recipient, and attachments.
"""
text = form['message']
recipient = form['recipient']
all_attachments = []
for i in range(Config.NUMBER_OF_ATTACHMENTS):
attachment = form.get(f'attachment-{i}')
filename = form.get(f'filename-{i}', '').encode('ascii', 'ignore').decode() # remove non-ascii characters
if not attachment:
continue
sanitized_filename = sanitize_filename(filename)
all_attachments.append((sanitized_filename, attachment))
return text, recipient, all_attachments
def valid_recipient(recipient):
"""
Checks if the recipient is valid.
"""
valid_recipients = ['legal', 'devcon', 'esp', 'security', 'oleh']
return recipient in valid_recipients
def get_identifier(recipient, now=None, randint=None):
"""
Generates a unique identifier based on the recipient, current timestamp, and a random number.
"""
if now is None:
now = datetime.now()
if randint is None:
randint = Random().randint(1000, 9999)
return f'{recipient}:{now.strftime("%Y:%m:%d:%H:%M:%S")}:{randint}'
def create_email(to_email, identifier, text, all_attachments):
"""
Creates an email message with attachments.
"""
plain_text = text.replace('<br />', '\n')
message = Mail(
from_email=FROMEMAIL,
to_emails=to_email,
subject=f'Secure Form Submission {identifier}',
plain_text_content=plain_text)
for item in all_attachments:
filename = item['filename']
attachment = item['attachment']
encoded_file = base64.b64encode(attachment.encode("utf-8")).decode()
attachedFile = Attachment(
FileContent(encoded_file),
FileName(filename + '.pgp'),
FileType('application/pgp-encrypted'),
Disposition('attachment')
)
message.add_attachment(attachedFile)
return message
def validate_recaptcha(recaptcha_response):
"""
Validates the ReCaptcha response.
"""
if not recaptcha.verify(response=recaptcha_response):
raise ValueError('Error: ReCaptcha verification failed!')
def send_email(message):
"""
Sends the email using SendGrid.
"""
sg = SendGridAPIClient(SENDGRIDAPIKEY)
response = sg.send(message)
if response.status_code not in [200, 201, 202]:
raise ValueError(f"Error: Failed to send email. Status code: {response.status_code}")
# Validate required environment variables
required_env_vars = ['RECAPTCHASITEKEY', 'RECAPTCHASECRETKEY', 'SENDGRIDAPIKEY', 'SENDGRIDFROMEMAIL']
validate_env_vars(required_env_vars)
RECAPTCHASITEKEY = os.environ['RECAPTCHASITEKEY']
RECAPTCHASECRETKEY = os.environ['RECAPTCHASECRETKEY']
SENDGRIDAPIKEY = os.environ['SENDGRIDAPIKEY']
FROMEMAIL = os.environ['SENDGRIDFROMEMAIL']
app = Flask(__name__)
app.config.from_object(Config)
recaptcha = ReCaptcha(app)
# Initialize rate limiting
limiter = Limiter(get_remote_address, app=app, default_limits=["200 per day", "50 per hour"])
# Configure logging
log_file = os.environ.get('LOG_FILE', '')
if log_file:
logging.basicConfig(filename=log_file, level=logging.INFO)
else:
logging.basicConfig(level=logging.INFO)
@app.route('/', methods=['GET'])
def index():
return render_template('index.html', notice='', hascaptcha=not Config.DEBUG_MODE, attachments_number=Config.NUMBER_OF_ATTACHMENTS, recaptcha_sitekey=RECAPTCHASITEKEY)
@app.route('/submit-encrypted-data', methods=['POST'])
@limiter.limit("5 per minute")
def submit():
try:
# Parse JSON data from request
data = request.get_json()
# Validate ReCaptcha unless in debug mode
if not Config.DEBUG_MODE:
validate_recaptcha(data['g-recaptcha-response'])
# Extract fields from JSON data
message = data['message']
recipient = data['recipient']
files = data['files']
if not message:
raise ValueError('Error: empty message!')
if not valid_recipient(recipient):
raise ValueError('Error: Invalid recipient!')
# Get submission statistics
date = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
message_length = len(message)
file_count = len(files)
to_email = Config.DEFAULT_RECIPIENT_EMAIL if recipient == 'legal' else recipient + Config.EMAIL_DOMAIN
identifier = get_identifier(recipient)
log_data = f"{date} - message to: {recipient}, identifier: {identifier}, length: {message_length}, file count: {file_count}"
logging.info(log_data)
message = create_email(to_email, identifier, message, files)
if Config.DEBUG_MODE:
print(f"Attempt to send email to {to_email}")
print(message.get())
else:
send_email(message)
notice = f'Thank you! The relevant team was notified of your submission. You could use the following identifier to refer to it in correspondence: <b>{identifier}</b>'
# Return success response
return jsonify({'status': 'success', 'message': notice})
except Exception as e:
# Log error message and return failure response
error_message = "An unexpected error occurred. Please try again later."
logging.error(f"Internal error: {str(e)}")
return jsonify({'status': 'failure', 'message': error_message})
@app.errorhandler(413)
def error413(e):
return render_template('413.html'), 413
if __name__ == '__main__':
app.run()