capsul-flask/capsulflask/__init__.py

import logging 
from logging.config import dictConfig as logging_dict_config

import atexit
import os
import hashlib
import requests
import sys

import stripe
from dotenv import load_dotenv, find_dotenv
from flask import Flask
from flask_mail import Mail, Message
from flask import render_template
from flask import url_for
from flask import current_app
from apscheduler.schedulers.background import BackgroundScheduler


from capsulflask.shared import my_exec_info_message
from capsulflask import hub_model, spoke_model, cli
from capsulflask.btcpay import client as btcpay
from capsulflask.http_client import MyHTTPClient

class StdoutMockFlaskMail:
    def send(self, message: Message):
      current_app.logger.info(f"Email would have been sent if configured:\n\nto: {','.join(message.recipients)}\nsubject: {message.subject}\nbody:\n\n{message.body}\n\n")


load_dotenv(find_dotenv())

for var_name in [
  "SPOKE_HOST_TOKEN", "HUB_TOKEN", "STRIPE_SECRET_KEY",
  "BTCPAY_PRIVATE_KEY", "MAIL_PASSWORD"
]:
  var = os.environ.get(f"{var_name}_FILE")
  if not var:
    continue

  if not os.path.isfile(var):
    continue

  with open(var) as secret_file:
    os.environ[var_name] = secret_file.read().rstrip('\n')
  del os.environ[f"{var_name}_FILE"]

app = Flask(__name__)

app.config.from_mapping(
  BASE_URL=os.environ.get("BASE_URL", default="http://localhost:5000"),
  SECRET_KEY=os.environ.get("SECRET_KEY", default="dev"),
  HUB_MODE_ENABLED=os.environ.get("HUB_MODE_ENABLED", default="True").lower() in ['true', '1', 't', 'y', 'yes'],
  SPOKE_MODE_ENABLED=os.environ.get("SPOKE_MODE_ENABLED", default="True").lower() in ['true', '1', 't', 'y', 'yes'],
  INTERNAL_HTTP_TIMEOUT_SECONDS=os.environ.get("INTERNAL_HTTP_TIMEOUT_SECONDS", default="300"),
  HUB_MODEL=os.environ.get("HUB_MODEL", default="capsul-flask"),
  SPOKE_MODEL=os.environ.get("SPOKE_MODEL", default="mock"),
  LOG_LEVEL=os.environ.get("LOG_LEVEL", default="INFO"),
  SPOKE_HOST_ID=os.environ.get("SPOKE_HOST_ID", default="baikal"),
  SPOKE_HOST_TOKEN=os.environ.get("SPOKE_HOST_TOKEN", default="changeme"),
  HUB_TOKEN=os.environ.get("HUB_TOKEN", default="changeme"),

  # https://www.postgresql.org/docs/9.1/libpq-ssl.html#LIBPQ-SSL-SSLMODE-STATEMENTS
  # https://stackoverflow.com/questions/56332906/where-to-put-ssl-certificates-when-trying-to-connect-to-a-remote-database-using
  # TLS example: sslmode=verify-full sslrootcert=letsencrypt-root-ca.crt host=db.example.com port=5432 user=postgres password=dev dbname=postgres
  POSTGRES_CONNECTION_PARAMETERS=os.environ.get(
    "POSTGRES_CONNECTION_PARAMETERS", 
    default="host=localhost port=5432 user=postgres password=dev dbname=postgres"
  ),

  DATABASE_SCHEMA=os.environ.get("DATABASE_SCHEMA", default="public"),

  MAIL_SERVER=os.environ.get("MAIL_SERVER", default=""),
  MAIL_PORT=os.environ.get("MAIL_PORT", default="465"),
  MAIL_USE_TLS=os.environ.get("MAIL_USE_TLS", default="False").lower() in ['true', '1', 't', 'y', 'yes'],
  MAIL_USE_SSL=os.environ.get("MAIL_USE_SSL", default="True").lower() in ['true', '1', 't', 'y', 'yes'],
  MAIL_USERNAME=os.environ.get("MAIL_USERNAME", default=""),
  MAIL_PASSWORD=os.environ.get("MAIL_PASSWORD", default=""),
  MAIL_DEFAULT_SENDER=os.environ.get("MAIL_DEFAULT_SENDER", default="no-reply@capsul.org"),
  ADMIN_EMAIL_ADDRESSES=os.environ.get("ADMIN_EMAIL_ADDRESSES", default="ops@cyberia.club"),
  ADMIN_PANEL_ALLOW_EMAIL_ADDRESSES=os.environ.get("ADMIN_PANEL_ALLOW_EMAIL_ADDRESSES", default="forest.n.johnson@gmail.com,capsul@cyberia.club"),

  PROMETHEUS_URL=os.environ.get("PROMETHEUS_URL", default="https://prometheus.cyberia.club"),

  STRIPE_API_VERSION=os.environ.get("STRIPE_API_VERSION", default="2020-03-02"),
  STRIPE_SECRET_KEY=os.environ.get("STRIPE_SECRET_KEY", default=""),
  STRIPE_PUBLISHABLE_KEY=os.environ.get("STRIPE_PUBLISHABLE_KEY", default=""),
  #STRIPE_WEBHOOK_SECRET=os.environ.get("STRIPE_WEBHOOK_SECRET", default="")

  BTCPAY_PRIVATE_KEY=os.environ.get("BTCPAY_PRIVATE_KEY", default="").replace("\\n", "\n"),
  BTCPAY_URL=os.environ.get("BTCPAY_URL", default="")
)

app.config['HUB_URL'] = os.environ.get("HUB_URL", default=app.config['BASE_URL'])

class SetLogLevelToDebugForHeartbeatRelatedMessagesFilter(logging.Filter):
  def isHeartbeatRelatedString(self, thing):
    # thing_string = "<error>"
    is_in_string = False
    try:
      thing_string = "%s" % thing
      is_in_string = 'heartbeat-task' in thing_string or 'hub/heartbeat' in thing_string or 'spoke/heartbeat' in thing_string
    except:
      pass
    # self.warning("isHeartbeatRelatedString(%s): %s", thing_string, is_in_string )
    return is_in_string

  def filter(self, record):
    if app.config['LOG_LEVEL'] == "DEBUG":
      return True

    if self.isHeartbeatRelatedString(record.msg):
      return False
    for arg in record.args:
      if self.isHeartbeatRelatedString(arg):
        return False

    return True

logging_dict_config({
  'version': 1,
  'formatters': {'default': {
    'format': '[%(asctime)s] %(levelname)s in %(module)s: %(message)s',
  }},
  'filters': {
    'setLogLevelToDebugForHeartbeatRelatedMessages': {
        '()': SetLogLevelToDebugForHeartbeatRelatedMessagesFilter,
    }
  },
  'handlers': {'wsgi': {
    'class': 'logging.StreamHandler',
    'stream': 'ext://flask.logging.wsgi_errors_stream',
    'formatter': 'default',
    'filters': ['setLogLevelToDebugForHeartbeatRelatedMessages']
  }},
  'root': {
    'level': app.config['LOG_LEVEL'],
    'handlers': ['wsgi']
  }
})

# app.logger.critical("critical")
# app.logger.error("error")
# app.logger.warning("warning")
# app.logger.info("info")
# app.logger.debug("debug")

stripe.api_key = app.config['STRIPE_SECRET_KEY']
stripe.api_version = app.config['STRIPE_API_VERSION']

if app.config['MAIL_SERVER'] != "":
  app.config['FLASK_MAIL_INSTANCE'] = Mail(app)
else:
  app.logger.warning("No MAIL_SERVER configured. capsul will simply print emails to stdout.")
  app.config['FLASK_MAIL_INSTANCE'] = StdoutMockFlaskMail()

app.config['HTTP_CLIENT'] = MyHTTPClient(timeout_seconds=int(app.config['INTERNAL_HTTP_TIMEOUT_SECONDS']))

app.config['BTCPAY_ENABLED'] = False
if app.config['BTCPAY_URL'] != "":
  try:
    app.config['BTCPAY_CLIENT'] = btcpay.Client(api_uri=app.config['BTCPAY_URL'], pem=app.config['BTCPAY_PRIVATE_KEY'])
    app.config['BTCPAY_ENABLED'] = True
  except:
    app.logger.warning("unable to create btcpay client. Capsul will work fine except cryptocurrency payments will not work. The error was: " + my_exec_info_message(sys.exc_info()))

# only start the scheduler and attempt to migrate the database if we are running the app.
# otherwise we are running a CLI command.
command_line = ' '.join(sys.argv)
is_running_server = ('flask run' in command_line) or ('gunicorn' in command_line)

app.logger.info(f"is_running_server: {is_running_server}")

if app.config['HUB_MODE_ENABLED']:

  if app.config['HUB_MODEL'] == "capsul-flask":
    app.config['HUB_MODEL'] = hub_model.CapsulFlaskHub()

    # debug mode (flask reloader) runs two copies of the app. When running in debug mode,
    # we only want to start the scheduler one time.
    if is_running_server and (not app.debug or os.environ.get('WERKZEUG_RUN_MAIN') == 'true'):
      scheduler = BackgroundScheduler()
      heartbeat_task_url = f"{app.config['HUB_URL']}/hub/heartbeat-task"
      heartbeat_task_headers = {'Authorization': f"Bearer {app.config['HUB_TOKEN']}"}
      heartbeat_task = lambda: requests.post(heartbeat_task_url, headers=heartbeat_task_headers)
      scheduler.add_job(name="heartbeat-task", func=heartbeat_task, trigger="interval", seconds=5)
      scheduler.start()

      atexit.register(lambda: scheduler.shutdown())

  else:
    app.config['HUB_MODEL'] = hub_model.MockHub()

  from capsulflask import db
  db.init_app(app, is_running_server)

  from capsulflask import auth, landing, console, payment, metrics, cli, hub_api, admin

  app.register_blueprint(landing.bp)
  app.register_blueprint(auth.bp)
  app.register_blueprint(console.bp)
  app.register_blueprint(payment.bp)
  app.register_blueprint(metrics.bp)
  app.register_blueprint(cli.bp)
  app.register_blueprint(hub_api.bp)
  app.register_blueprint(admin.bp)

  app.add_url_rule("/", endpoint="index")



if app.config['SPOKE_MODE_ENABLED']:

  if app.config['SPOKE_MODEL'] == "shell-scripts":
    app.config['SPOKE_MODEL'] = spoke_model.ShellScriptSpoke()
  else:
    app.config['SPOKE_MODEL'] = spoke_model.MockSpoke()

  from capsulflask import spoke_api

  app.register_blueprint(spoke_api.bp)

@app.after_request
def security_headers(response):
  response.headers['X-Frame-Options'] = 'SAMEORIGIN'
  if 'Content-Security-Policy' not in response.headers:
    response.headers['Content-Security-Policy'] = "default-src 'self'"
  response.headers['X-Content-Type-Options'] = 'nosniff'
  return response


@app.context_processor
def override_url_for():
  """
  override the url_for function built into flask 
  with our own custom implementation that busts the cache correctly when files change 
  """
  return dict(url_for=url_for_with_cache_bust)


def url_for_with_cache_bust(endpoint, **values):
  """
  Add a query parameter based on the hash of the file, this acts as a cache bust
  """
  
  if endpoint == 'static':
    filename = values.get('filename', None)
    if filename:
      if 'STATIC_FILE_HASH_CACHE' not in current_app.config:
        current_app.config['STATIC_FILE_HASH_CACHE'] = dict()
      
      if filename not in current_app.config['STATIC_FILE_HASH_CACHE']:
        filepath = os.path.join(current_app.root_path, endpoint, filename)
        #print(filepath)
        if os.path.isfile(filepath) and os.access(filepath, os.R_OK):
          
          with open(filepath, 'rb') as file:
            hasher = hashlib.md5()
            hasher.update(file.read())
            current_app.config['STATIC_FILE_HASH_CACHE'][filename] = hasher.hexdigest()[-6:]
            
      values['q'] = current_app.config['STATIC_FILE_HASH_CACHE'][filename]

  return url_for(endpoint, **values)