From 08f4d63f450ccd96f5077bc60774d8f1fecec92c Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <koszko@koszko.org>
Date: Wed, 16 Nov 2022 18:52:53 +0100
Subject: initial commit

---
 src/koszko_org_website/app.py | 159 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 src/koszko_org_website/app.py

(limited to 'src/koszko_org_website/app.py')

diff --git a/src/koszko_org_website/app.py b/src/koszko_org_website/app.py
new file mode 100644
index 0000000..e3e6339
--- /dev/null
+++ b/src/koszko_org_website/app.py
@@ -0,0 +1,159 @@
+# SPDX-License-Identifier: CC0-1.0
+
+# koszko.org website logic.
+
+# Copyright (C) 2021, 2022 Wojtek Kosior
+
+import gettext
+import dataclasses as dc
+import typing as t
+
+from pathlib import Path, PurePosixPath
+
+import flask
+import werkzeug
+import jinja2
+import jinja2.exceptions
+
+
+here = Path(__file__).resolve().parent
+
+
+pages = {
+    'index.html'
+}
+
+
+langs_short_2_long = {
+    'en': 'en_US',
+    'pl': 'pl_PL'
+}
+
+langs_long_2_short = dict((v, k) for k, v in langs_short_2_long.items())
+
+default_locale = 'pl_PL'
+
+
+def raise_exception(msg) -> t.NoReturn:
+    raise Exception(msg)
+
+
+@dc.dataclass(init=False)
+class Website(flask.Flask):
+    def __init__(self) -> None:
+        super().__init__(__name__)
+
+        self.jinja_options = {
+            **self.jinja_options,
+            'loader':        jinja2.PackageLoader(__package__),
+            'autoescape':    jinja2.select_autoescape(['.jinja']),
+            'lstrip_blocks': True,
+            'extensions': [
+                *self.jinja_options.get('extensions', []),
+                'jinja2.ext.i18n',
+                'jinja2.ext.do'
+            ]
+        }
+
+        self.jinja_env.globals['raise'] = raise_exception
+
+    def koszko_install_translations(self, locale: str) -> None:
+        translations = gettext.translation(
+            'messages',
+            localedir = here / 'locales',
+            languages = [locale]
+        )
+        self.jinja_env.install_gettext_translations(translations)
+
+
+website_app = Website()
+
+
+def show_page(lang_short: str, page_path: str) -> str:
+    for segment in PurePosixPath(page_path).parts:
+        if segment.startswith('__'):
+            flask.abort(404)
+
+    effective_page_path = '__index.html' if page_path == '' else page_path
+
+    app = t.cast(Website, flask.current_app)
+    app.koszko_install_translations(langs_short_2_long[lang_short])
+
+    for prefix in [f'{lang_short}', '']:
+        pure_path = PurePosixPath(prefix) / f'{effective_page_path}.jinja'
+        footer_path = pure_path.parent / f'__footer_for_{pure_path.name}'
+        try:
+            html = flask.render_template(
+                str(pure_path),
+                lang_short            = lang_short,
+                page_path             = page_path,
+                dedicated_footer_path = str(footer_path)
+            )
+            break
+        except jinja2.exceptions.TemplateNotFound:
+            if prefix == '':
+                raise
+
+    return html
+
+for lang in langs_short_2_long.keys():
+    def __show_page_in_lang(page_path: str, lang_short: str = lang) -> str:
+        return show_page(lang_short, page_path)
+
+    website_app.add_url_rule(
+        f'/{lang}/<path:page_path>',
+        f'show_page_in_{lang}',
+        __show_page_in_lang,
+        methods=['GET']
+    )
+
+    def __show_main_page_in_lang(lang_short: str = lang) -> str:
+        return show_page(lang_short, '')
+
+    website_app.add_url_rule(
+        f'/{lang}/',
+        f'show_main_page_in_{lang}',
+        __show_main_page_in_lang,
+        methods=['GET']
+    )
+
+@website_app.route('/<path:page_path>', methods=['GET'])
+def redirect_to_resource(page_path) -> werkzeug.Response:
+    if page_path != '':
+        path_start = PurePosixPath(page_path).parts[0]
+
+        if path_start == 'sideload':
+            return flask.Response(
+                "Incomplete server configuration - requests for '/sideload/' not routed as they should be.",
+                500
+            )
+
+        # Route to other stuff that was on this domain before and has been moved
+        # under '/sideload/'.
+        for name in ['fraktal', 'mm']:
+            if path_start == name:
+                return flask.redirect(f'/sideload/{name}')
+
+        # Make all resources from '/static' aliased under '/'.
+        if not page_path.endswith('.html'):
+            return flask.redirect(f'/static/{page_path}')
+
+    # Redirect to the most suitable language version of a page.
+    chosen_locale = flask.request.accept_languages.best_match(
+        langs_short_2_long.values(),
+        default = default_locale
+    )
+    if chosen_locale is None:
+        chosen_locale = default_locale
+
+    lang_short = langs_long_2_short[chosen_locale]
+
+    url = flask.url_for(
+        f'.show_page_in_{lang_short}',
+        page_path  = page_path
+    )
+    return flask.redirect(url)
+
+@website_app.route('/', methods=['GET'])
+def redirect_to_lang_main_page() -> werkzeug.Response:
+    return redirect_to_resource('')
-- 
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