flask.helpers safe_join Example Code

safe_join is a callable within the flask.helpers module of the Flask project.

flash, get_root_path, make_response, send_file, and url_for are several other callables with code examples from the same flask.helpers package.

Example 1 from CTFd

CTFd (homepage) is a capture the flag (CTF) hacking web app built with Flask. The application can be used as-is to run CTF events, or modified for custom rules for related scenarios. CTFd is open sourced under the Apache License 2.0.

CTFd / CTFd / init.py

# __init__.py
import datetime
import os
import sys
import weakref
from distutils.version import StrictVersion

import jinja2
from flask import Flask, Request
from flask.helpers import safe_join
from flask_migrate import upgrade
from jinja2 import FileSystemLoader
from jinja2.sandbox import SandboxedEnvironment
from werkzeug.middleware.proxy_fix import ProxyFix
from werkzeug.utils import cached_property

import CTFd.utils.config
from CTFd import utils
from CTFd.constants.themes import ADMIN_THEME, DEFAULT_THEME
from CTFd.plugins import init_plugins
from CTFd.utils.crypto import sha256
from CTFd.utils.initialization import (
from CTFd.utils.migrations import create_database, migrations, stamp_latest_revision
from CTFd.utils.sessions import CachingSessionInterface
from CTFd.utils.updates import update_check

__version__ = "3.3.0"
__channel__ = "oss"

## ... source file abbreviated to get to safe_join examples ...

            self.cache[cache_key] = template
        return template

class ThemeLoader(FileSystemLoader):

    DEFAULT_THEMES_PATH = os.path.join(os.path.dirname(__file__), "themes")

    def __init__(
        super(ThemeLoader, self).__init__(searchpath, encoding, followlinks)
        self.theme_name = theme_name

    def get_source(self, environment, template):
        if template.startswith(self._ADMIN_THEME_PREFIX):
            if self.theme_name != ADMIN_THEME:
                raise jinja2.TemplateNotFound(template)
            template = template[len(self._ADMIN_THEME_PREFIX) :]
        theme_name = self.theme_name or str(utils.get_config("ctf_theme"))
        template = safe_join(theme_name, "templates", template)
        return super(ThemeLoader, self).get_source(environment, template)

def confirm_upgrade():
    if sys.stdin.isatty():
        print("/*\\ CTFd has updated and must update the database! /*\\")
        print("/*\\ Please backup your database before proceeding! /*\\")
        print("/*\\ CTFd maintainers are not responsible for any data loss! /*\\")
        if input("Run database migrations (Y/N)").lower().strip() == "y":  # nosec B322
            return True
            print("/*\\ Ignored database migrations... /*\\")
            return False
        return True

def run_upgrade():
    utils.set_config("ctf_version", __version__)

def create_app(config="CTFd.config.Config"):
    app = CTFdFlask(__name__)

## ... source file continues with no further safe_join examples...

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