__init__.py

# -*- coding: utf-8 -*-

from __future__ import absolute_import

import json
import gettext

from pytz import timezone, UTC
from pytz.tzinfo import BaseTzInfo
from speaklater import is_lazy_string
import six
from furl import furl
import pycountry

from flask import Blueprint, request, current_app
from flask.json import JSONEncoder as JSONEncoderBase
from flask_assets import Environment, Bundle
from flask_caching import Cache
from flask_babelex import Babel, Domain

from coaster.assets import split_namespec
from coaster.auth import current_auth, request_has_auth
from coaster.sqlalchemy import RoleAccessProxy

try:
    from flask_debugtoolbar import DebugToolbarExtension
except ImportError:
    DebugToolbarExtension = None
try:
    from flask_debugtoolbar_lineprofilerpanel.profile import line_profile
except ImportError:
    line_profile = None

from ._version import *  # NOQA
from .assets import assets, Version
from . import translations

__all__ = ['baseframe', 'baseframe_js', 'baseframe_css', 'assets', 'Version', '_', '__']  # NOQA

networkbar_cache = Cache(with_jinja2_ext=False)
asset_cache = Cache(with_jinja2_ext=False)
cache = Cache()
babel = Babel()
if DebugToolbarExtension is not None:  # pragma: no cover
    toolbar = DebugToolbarExtension()
else:  # pragma: no cover
    toolbar = None


THEME_FILES = {
    'bootstrap3': {
        'ajaxform.html.jinja2': 'baseframe/bootstrap3/ajaxform.html.jinja2',
        'autoform.html.jinja2': 'baseframe/bootstrap3/autoform.html.jinja2',
        'delete.html.jinja2': 'baseframe/bootstrap3/delete.html.jinja2',
        'message.html.jinja2': 'baseframe/bootstrap3/message.html.jinja2',
        'redirect.html.jinja2': 'baseframe/bootstrap3/redirect.html.jinja2'
    },
    'mui': {
        'ajaxform.html.jinja2': 'baseframe/mui/ajaxform.html.jinja2',
        'autoform.html.jinja2': 'baseframe/mui/autoform.html.jinja2',
        'delete.html.jinja2': 'baseframe/mui/delete.html.jinja2',
        'message.html.jinja2': 'baseframe/mui/message.html.jinja2',
        'redirect.html.jinja2': 'baseframe/mui/redirect.html.jinja2'
    }
}

baseframe_translations = Domain(translations.__path__[0], domain='baseframe')
_ = baseframe_translations.gettext
__ = baseframe_translations.lazy_gettext


class JSONEncoder(JSONEncoderBase):
    """
    Custom JSON encoder that adds support to types that are not supported
    by Flask's JSON encoder. Eg: lazy_gettext
    """
    def default(self, o):
        if is_lazy_string(o):
            return six.text_type(o)
        if isinstance(o, BaseTzInfo):
            return o.zone
        if isinstance(o, RoleAccessProxy):
            return dict(o)
        if isinstance(o, furl):
            return o.url
        return super(JSONEncoder, self).default(o)


def _select_jinja_autoescape(filename):
    """
    Returns `True` if autoescaping should be active for the given template name.
    """
    if filename is None:
        return False
    return filename.endswith(('.html', '.htm', '.xml', '.xhtml',
        '.html.jinja', '.html.jinja2', '.xml.jinja', '.xml.jinja2', '.xhtml.jinja', '.xhtml.jinja2'))


class BaseframeBlueprint(Blueprint):
    def init_app(self, app, requires=[], ext_requires=[], bundle_js=None, bundle_css=None, assetenv=None, theme='bootstrap3'):
        """
        Initialize an app and load necessary assets.

        :param requires: List of required assets. If an asset has both .js
            and .css components, both will be added to the requirement list.
            Loaded assets will be minified and concatenated into the app's
            ``static/js`` and ``static/css`` folders. If an asset has problems
            with either of these, it should be loaded pre-bundled via the
            ``bundle_js`` and ``bundle_css`` parameters.
        :param ext_requires: Same as requires, but will be loaded from
            an external cookiefree server if ``ASSET_SERVER`` is in config,
            before the reqular requires list. Assets are loaded as part of
            ``requires`` if there is no asset server
        :param bundle_js: Bundle of additional JavaScript
        :param bundle_css: Bundle of additional CSS
        :param assetenv: Environment for assets (in case your app needs a custom environment)
        """
        # Since Flask 0.11, templates are no longer auto reloaded.
        # Setting the config alone doesn't seem to work, so we explicitly
        # set the jinja environment here.
        if app.config.get('TEMPLATES_AUTO_RELOAD') or (
                app.config.get('TEMPLATES_AUTO_RELOAD') is None and app.config.get('DEBUG')):
            app.jinja_env.auto_reload = True
        app.jinja_env.add_extension('jinja2.ext.do')
        app.jinja_env.autoescape = _select_jinja_autoescape
        if app.subdomain_matching:
            # Does this app want a static subdomain? (Default: yes, 'static').
            # Apps can disable this by setting STATIC_SUBDOMAIN = None.
            # Since Werkzeug internally uses '' instead of None, but takes None
            # as the default parameter, we remap '' to None in our config
            subdomain = app.config.get('STATIC_SUBDOMAIN', 'static') or None
            if subdomain:
                for rule in app.url_map.iter_rules('static'):
                    # For safety, seek out and update the static route added by Flask.
                    # Do not touch additional static routes added by the app or other
                    # blueprints
                    if not rule.subdomain:  # Will be '' not None
                        rule.subdomain = subdomain
                        rule.refresh()
                        break
        else:
            subdomain = None

        ignore_js = ['!jquery.js']
        ignore_css = []
        ext_js = []
        ext_css = []
        if app.config.get('ASSET_SERVER'):
            for itemgroup in ext_requires:
                sub_js = []
                sub_css = []
                if not isinstance(itemgroup, (list, tuple)):
                    itemgroup = [itemgroup]
                for item in itemgroup:
                    name, spec = split_namespec(item)
                    for alist, ilist, ext in [(sub_js, ignore_js, '.js'), (sub_css, ignore_css, '.css')]:
                        if name + ext in assets:
                            alist.append(name + ext + six.text_type(spec))
                            ilist.append('!' + name + ext)
                if sub_js:
                    ext_js.append(sub_js)
                if sub_css:
                    ext_css.append(sub_css)
        else:
            requires = [item for itemgroup in ext_requires
                for item in (itemgroup if isinstance(itemgroup, (list, tuple)) else [itemgroup])] + requires

        app.config['ext_js'] = ext_js
        app.config['ext_css'] = ext_css

        assets_js = []
        assets_css = []
        for item in requires:
            name, spec = split_namespec(item)
            for alist, ext in [(assets_js, '.js'), (assets_css, '.css')]:
                if name + ext in assets:
                    alist.append(name + ext + six.text_type(spec))
        js_all = Bundle(assets.require(*(ignore_js + assets_js)),
            filters='uglipyjs', output='js/baseframe-packed.js')
        css_all = Bundle(assets.require(*(ignore_css + assets_css)),
            filters=['cssrewrite', 'cssmin'], output='css/baseframe-packed.css')
        if bundle_js:
            js_all = Bundle(js_all, bundle_js)
        if bundle_css:
            css_all = Bundle(css_all, bundle_css)

        if assetenv is None:
            app.assets = Environment(app)
        else:
            app.assets = assetenv
        app.assets.register('js_jquery', assets.require('jquery.js'))
        app.assets.register('js_all', js_all)
        app.assets.register('css_all', css_all)
        app.register_blueprint(self, static_subdomain=subdomain)

        # Optional config for a client app to use a manifest file
        # to load fingerprinted assets
        # If used with webpack, the client app is expected to specify its own webpack.config.js
        # Set `ASSETS_MANIFEST_PATH` in `app.config` to the path for `manifest.json`.
        # Eg: "static/build/manifest.json"
        # Set `ASSET_BASE_PATH` in `app.config` to the path in which the compiled assets are present.
        # Eg: "static/build"
        if app.config.get('ASSET_MANIFEST_PATH'):
            # Load assets into config from a manifest file
            with app.open_resource(app.config['ASSET_MANIFEST_PATH']) as f:
                asset_bundles = json.loads(f.read())
                if app.config.get('assets'):
                    raise ValueError("Loading assets via a manifest file needs the `ASSETS` config key to be unused")
                app.config['assets'] = {}
                for asset_key, asset_path in asset_bundles['assets'].items():
                    app.config['assets'][asset_key] = asset_path

        app.config.setdefault('CACHE_KEY_PREFIX', 'flask_cache_' + app.name + '/')
        nwcacheconfig = dict(app.config)
        nwcacheconfig['CACHE_KEY_PREFIX'] = 'networkbar_'
        if 'CACHE_TYPE' not in nwcacheconfig:
            nwcacheconfig['CACHE_TYPE'] = 'simple'

        acacheconfig = dict(app.config)
        acacheconfig['CACHE_KEY_PREFIX'] = 'asset_'
        if 'CACHE_TYPE' not in acacheconfig:
            acacheconfig['CACHE_TYPE'] = 'simple'

        networkbar_cache.init_app(app, config=nwcacheconfig)
        asset_cache.init_app(app, config=acacheconfig)
        cache.init_app(app)

        babel.init_app(app)
        if toolbar is not None:
            if 'DEBUG_TB_PANELS' not in app.config:
                app.config['DEBUG_TB_PANELS'] = [
                    'flask_debugtoolbar.panels.versions.VersionDebugPanel',
                    'flask_debugtoolbar.panels.timer.TimerDebugPanel',
                    'flask_debugtoolbar.panels.headers.HeaderDebugPanel',
                    'flask_debugtoolbar.panels.request_vars.RequestVarsDebugPanel',
                    'flask_debugtoolbar.panels.config_vars.ConfigVarsDebugPanel',
                    'flask_debugtoolbar.panels.template.TemplateDebugPanel',
                    'flask_debugtoolbar.panels.sqlalchemy.SQLAlchemyDebugPanel',
                    'flask_debugtoolbar.panels.logger.LoggingPanel',
                    'flask_debugtoolbar.panels.route_list.RouteListDebugPanel',
                    'flask_debugtoolbar.panels.profiler.ProfilerDebugPanel',
                ]
                if line_profile is not None:
                    app.config['DEBUG_TB_PANELS'].append(
                        'flask_debugtoolbar_lineprofilerpanel.panels.LineProfilerPanel')
            toolbar.init_app(app)

        app.json_encoder = JSONEncoder
        # If this app has a Lastuser extension registered, give it a cache
        lastuser = getattr(app, 'extensions', {}).get('lastuser')
        if lastuser and hasattr(lastuser, 'init_cache'):
            lastuser.init_cache(app=app, cache=cache)

        app.config['tz'] = timezone(app.config.get('TIMEZONE', 'UTC'))

        if theme not in THEME_FILES:
            raise ValueError("Unrecognised theme: %s" % theme)
        app.config['theme'] = theme

        if 'NETWORKBAR_DATA' not in app.config:
            app.config['NETWORKBAR_DATA'] = 'https://api.hasgeek.com/1/networkbar/networkbar.json'

        if isinstance(app.config.get('NETWORKBAR_DATA'), (list, tuple)):
            app.config['NETWORKBAR_LINKS'] = app.config['NETWORKBAR_DATA']

    def register(self, app, options, first_registration=False):
        """
        Called by :meth:`Flask.register_blueprint` to register all views
        and callbacks registered on the blueprint with the application. Creates
        a :class:`.BlueprintSetupState` and calls each :meth:`record` callback
        with it.

        :param app: The application this blueprint is being registered with.
        :param options: Keyword arguments forwarded from
            :meth:`~Flask.register_blueprint`.
        :param first_registration: Whether this is the first time this
            blueprint has been registered on the application.
        """
        self._got_registered_once = True
        state = self.make_setup_state(app, options, first_registration)

        if self.has_static_folder:
            state.add_url_rule(
                self.static_url_path + '/<path:filename>',
                view_func=self.send_static_file,
                endpoint='static',
                subdomain=options.get('static_subdomain'))

        for deferred in self.deferred_functions:
            deferred(state)


baseframe = BaseframeBlueprint('baseframe', __name__,
    static_folder='static',
    static_url_path='/_baseframe',
    template_folder='templates')


@babel.localeselector
def get_locale():
    # If this app and request have a user that specifies a locale, use it
    user = current_auth.actor  # Use 'actor' instead of 'user' to support anon users
    if user is not None and hasattr(user, 'locale') and user.locale:
        return user.locale
    # Otherwise try to guess the language from the user accept
    # header the browser transmits. We support a few in this
    # example. The best match wins.

    # FIXME: Do this properly. Don't use a random selection of languages
    return request.accept_languages.best_match(['de', 'fr', 'es', 'hi', 'te', 'ta', 'kn', 'ml', 'en']) or 'en'


@babel.timezoneselector
def get_timezone():
    # If this app and request have a user, return user's timezone,
    # else return app default timezone
    if current_auth.actor is not None:  # Use 'actor' instead of 'user' to support anon users
        user = current_auth.actor
        if hasattr(user, 'tz'):
            return user.tz
        elif hasattr(user, 'timezone'):
            return timezone(user.timezone)
    return current_app.config.get('tz') or UTC


def localized_country_list():
    """
    Returns a localized list of country names and their ISO3166-1 alpha-2 code inside a request context.

    The locale depends on the `Accept-Language` header of the request for now.
    The best matched locale is picked in `get_locale()` function and then used
    to localize the country names.

    The list is ordered by the localized country name and not the alpha-2 code.
    The list is also memoized with the locale code as the key for a day.
    """
    return _localized_country_list_inner(get_locale())


@cache.memoize(timeout=86400)
def _localized_country_list_inner(locale):
    if locale == 'en':
        countries = [(country.name, country.alpha_2) for country in pycountry.countries]
    else:
        pycountry_locale = gettext.translation('iso3166-1', pycountry.LOCALES_DIR, languages=[locale])
        if six.PY2:
            countries = [(pycountry_locale.gettext(country.name).decode('utf-8'), country.alpha_2) for country in pycountry.countries]
        else:
            countries = [(pycountry_locale.gettext(country.name), country.alpha_2) for country in pycountry.countries]
    countries.sort()
    return [(code, name) for (name, code) in countries]


def localize_timezone(datetime, tz=None):
    if not datetime.tzinfo:
        datetime = UTC.localize(datetime)
    if not tz:
        tz = get_timezone()
    if isinstance(tz, six.string_types):
        tz = timezone(tz)
    return datetime.astimezone(tz)


@baseframe.after_app_request
def process_response(response):
    if request.endpoint in ('static', 'baseframe.static'):
        if 'Access-Control-Allow-Origin' not in response.headers:
            # This is required for webfont resources
            # Note: We do not serve static assets in production, nginx does.
            # That means this piece of code will never be called in production.
            response.headers['Access-Control-Allow-Origin'] = '*'

    if 'Vary' in response.headers:
        vary_values = [item.strip() for item in response.headers['Vary'].split(',')]
        if 'Accept-Language' not in vary_values:
            vary_values.append('Accept-Language')
        if 'Cookie' not in vary_values:
            vary_values.append('Cookie')
        response.headers['Vary'] = ', '.join(vary_values)
    else:
        response.headers['Vary'] = 'Accept-Language, Cookie'

    # Prevent pages from being placed in an iframe. If the response already
    # set has a value for this option, let it pass through
    if 'X-Frame-Options' in response.headers:
        frameoptions = response.headers.get('X-Frame-Options')
        if not frameoptions or frameoptions == 'ALLOW':
            # 'ALLOW' is an unofficial signal from the app to Baseframe.
            # It signals us to remove the header and not set a default
            response.headers.pop('X-Frame-Options')
    else:
        if request_has_auth() and getattr(current_auth, 'login_required', False):
            # Protect only login_required pages from appearing in frames
            response.headers['X-Frame-Options'] = 'SAMEORIGIN'

    # In memoriam. http://www.gnuterrypratchett.com/
    response.headers['X-Clacks-Overhead'] = 'GNU Terry Pratchett'

    return response


# Replace gettext handlers for imports
b_ = _
b__ = __
from flask_babelex import gettext as _, lazy_gettext as __

from .utils import *    # NOQA
from .views import *    # NOQA
from .errors import *   # NOQA
from .filters import *  # NOQA

# Deprecated imports
from .deprecated import *  # NOQA