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""" |
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byceps.config |
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~~~~~~~~~~~~~ |
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:Copyright: 2006-2020 Jochen Kupperschmidt |
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:License: Modified BSD, see LICENSE for details. |
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""" |
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from enum import Enum |
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from typing import Any, Optional |
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from flask import current_app, Flask |
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from .services.site.transfer.models import SiteID |
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EXTENSION_KEY = 'byceps_config' |
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KEY_APP_MODE = 'app_mode' |
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KEY_SITE_ID = 'site_id' |
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AppMode = Enum('AppMode', ['admin', 'site']) |
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AppMode.is_admin = lambda self: self == AppMode.admin |
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AppMode.is_site = lambda self: self == AppMode.site |
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class ConfigurationError(Exception): |
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pass |
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def init_app(app: Flask) -> None: |
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app.extensions[EXTENSION_KEY] = {} |
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app_mode = _determine_app_mode(app) |
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set_extension_value(KEY_APP_MODE, app_mode, app) |
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if app_mode.is_site(): |
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site_id = _determine_site_id(app) |
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set_extension_value(KEY_SITE_ID, site_id, app) |
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def get_extension_value(key: str, app: Optional[Flask]=None) -> Any: |
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"""Return the value for the key in this application's own extension |
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namespace. |
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It is expected that the value has already been set. An exception is |
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raised if that is not the case. |
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""" |
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if app is None: |
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app = current_app |
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extension = app.extensions[EXTENSION_KEY] |
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return extension[key] |
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def set_extension_value(key: str, value: Any, app: Flask) -> None: |
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"""Set/replace the value for the key in this application's own |
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extension namespace. |
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""" |
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extension = app.extensions[EXTENSION_KEY] |
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extension[key] = value |
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# -------------------------------------------------------------------- # |
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# app mode |
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def _determine_app_mode(app: Flask) -> AppMode: |
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value = app.config.get('APP_MODE') |
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if value is None: |
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raise ConfigurationError('No app mode configured.') |
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try: |
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return AppMode[value] |
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except KeyError: |
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raise ConfigurationError(f'Invalid app mode "{value}" configured.') |
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def get_app_mode(app: Optional[Flask]=None) -> AppMode: |
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"""Return the mode the site should run in.""" |
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return get_extension_value(KEY_APP_MODE, app) |
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# -------------------------------------------------------------------- # |
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# site ID |
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def _determine_site_id(app: Flask) -> SiteID: |
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site_id = app.config.get('SITE_ID') |
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if site_id is None: |
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raise ConfigurationError('No site ID configured.') |
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return site_id |
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def get_current_site_id(app: Optional[Flask]=None) -> SiteID: |
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"""Return the id of the current site.""" |
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return get_extension_value(KEY_SITE_ID, app) |
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byceps /
byceps
