# HG changeset patch
# User Dennis Fink <dennis.fink@c3l.lu>
# Date 2022-01-16 21:46:21
# Node ID 4005eddcc5591f1069704f6eecbfe611412e0c60
# Parent  b4073d9d0e36f60c2d5f0e7e76c2a58df6a3dd36

Add Flask-Babel

This allows us to to i18n an l10n of the membership form.

diff --git a/babel.cfg b/babel.cfg
new file mode 100644
--- /dev/null
+++ b/babel.cfg
@@ -0,0 +1,3 @@
+[python: **.py]
+[jinja2: **/templates/**.html]
+extensions=jinja2.ext.autoescape,jinja2.ext.with_
diff --git a/c3l_membership/__init__.py b/c3l_membership/__init__.py
--- a/c3l_membership/__init__.py
+++ b/c3l_membership/__init__.py
@@ -3,12 +3,14 @@ import json
 import os.path
 import secrets
 
-from flask import Flask
+from flask import Flask, g, redirect, request, url_for
+from flask_babel import Babel
 from flask_qrcode import QRcode
 
 config_file = os.path.abspath("/etc/membership.json")
 
 qrcode = QRcode()
+babel = Babel()
 
 
 def create_app():
@@ -21,9 +23,11 @@ def create_app():
         pass
 
     qrcode.init_app(app)
+    babel.init_app(app)
 
     _default_secret_key = base64.b64encode(secrets.token_bytes()).decode("utf-8")
     app.config["SECRET_KEY"] = os.environ.get("SECRET_KEY", _default_secret_key)
+    app.config["LANGUAGES"] = ["en", "de", "fr", "lb"]
 
     app.config.setdefault("SUPPORTING_FEE", 40)
     app.config.setdefault("REGULAR_FEE", 120)
@@ -47,10 +51,21 @@ def create_app():
         "ZCASH_CONVERSION_SCRIPT", "/usr/local/share/zcash/ZCASH_Membership.pl"
     )
 
+    @babel.localeselector
+    def get_locale():
+        if not g.get("lang_code", None):
+            g.lang_code = request.accept_languages.best_match(app.config["LANGUAGES"])
+        return g.lang_code
+
     from .views import root_page
 
     app.register_blueprint(root_page)
 
+    @app.route("/")
+    def home():
+        g.lang_code = request.accept_languages.best_match(app.config["LANGUAGES"])
+        return redirect(url_for("root.index"))
+
     return app
 
 
diff --git a/c3l_membership/views.py b/c3l_membership/views.py
--- a/c3l_membership/views.py
+++ b/c3l_membership/views.py
@@ -2,16 +2,26 @@ import re
 import subprocess
 from datetime import date
 
-from flask import Blueprint, current_app, render_template, request
+from flask import Blueprint, current_app, g, render_template, request
 from flask_weasyprint import HTML, render_pdf
 
 from .forms import MembershipForm
 
-root_page = Blueprint("root", __name__)
+root_page = Blueprint("root", __name__, url_prefix="/<lang_code>")
 
 xml_template = "<member><numm>{name}</numm><gebuertsdag>{birthday:%d.%m.%Y}</gebuertsdag><address>{address}</address><nick>{username}</nick><email>{email}</email><status>{status}</status><stemmrecht>{voting}</stemmrecht></member>"
 
 
+@root_page.url_defaults
+def add_lang_code(endpoint, values):
+    values.setdefault("lang_code", g.lang_code)
+
+
+@root_page.url_value_preprocessor
+def pull_lang_code(endpoint, values):
+    g.lang_code = values.pop("lang_code")
+
+
 @root_page.route("/", methods=("GET", "POST"))
 def index():
     form = MembershipForm()
diff --git a/poetry.lock b/poetry.lock
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,3 +1,14 @@
+[[package]]
+name = "babel"
+version = "2.9.1"
+description = "Internationalization utilities"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.dependencies]
+pytz = ">=2015.7"
+
 [[package]]
 name = "black"
 version = "21.12b0"
@@ -172,6 +183,23 @@ async = ["asgiref (>=3.2)"]
 dotenv = ["python-dotenv"]
 
 [[package]]
+name = "flask-babel"
+version = "2.0.0"
+description = "Adds i18n/l10n support to Flask applications"
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+Babel = ">=2.3"
+Flask = "*"
+Jinja2 = ">=2.5"
+pytz = "*"
+
+[package.extras]
+dev = ["pytest", "pytest-mock", "bumpversion", "ghp-import", "sphinx", "pallets-sphinx-themes"]
+
+[[package]]
 name = "flask-qrcode"
 version = "3.0.0"
 description = "A concise Flask extension to render QR codes on Jinja2 templates using python-qrcode"
@@ -374,6 +402,14 @@ doc = ["sphinx", "sphinx-rtd-theme"]
 test = ["pytest", "pytest-cov", "pytest-flake8", "pytest-isort", "coverage"]
 
 [[package]]
+name = "pytz"
+version = "2021.3"
+description = "World timezone definitions, modern and historical"
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
 name = "qrcode"
 version = "7.3.1"
 description = "QR Code image generator"
@@ -508,9 +544,13 @@ testing = ["pytest (>=4.6)", "pytest-che
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.7.0,<4"
-content-hash = "71f2f5db862ef41b627c0a05e0c0b4ceaf7aa1316f8cd13232df304a470dacf4"
+content-hash = "e6337b7e5ae01abe852dbd202497fef50c09546e0a0f98f26b3ee81beb262237"
 
 [metadata.files]
+babel = [
+    {file = "Babel-2.9.1-py2.py3-none-any.whl", hash = "sha256:ab49e12b91d937cd11f0b67cb259a57ab4ad2b59ac7a3b41d6c06c0ac5b0def9"},
+    {file = "Babel-2.9.1.tar.gz", hash = "sha256:bc0c176f9f6a994582230df350aa6e05ba2ebe4b3ac317eab29d9be5d2768da0"},
+]
 black = [
     {file = "black-21.12b0-py3-none-any.whl", hash = "sha256:a615e69ae185e08fdd73e4715e260e2479c861b5740057fde6e8b4e3b7dd589f"},
     {file = "black-21.12b0.tar.gz", hash = "sha256:77b80f693a569e2e527958459634f18df9b0ba2625ba4e0c2d5da5be42e6f2b3"},
@@ -605,6 +645,10 @@ flask = [
     {file = "Flask-2.0.2-py3-none-any.whl", hash = "sha256:cb90f62f1d8e4dc4621f52106613488b5ba826b2e1e10a33eac92f723093ab6a"},
     {file = "Flask-2.0.2.tar.gz", hash = "sha256:7b2fb8e934ddd50731893bdcdb00fc8c0315916f9fcd50d22c7cc1a95ab634e2"},
 ]
+flask-babel = [
+    {file = "Flask-Babel-2.0.0.tar.gz", hash = "sha256:f9faf45cdb2e1a32ea2ec14403587d4295108f35017a7821a2b1acb8cfd9257d"},
+    {file = "Flask_Babel-2.0.0-py3-none-any.whl", hash = "sha256:e6820a052a8d344e178cdd36dd4bb8aea09b4bda3d5f9fa9f008df2c7f2f5468"},
+]
 flask-qrcode = [
     {file = "Flask-QRcode-3.0.0.tar.gz", hash = "sha256:96a49da1396a600e79cc4b119610a2e61cb1433f9449994eabf36bbe1478b96b"},
 ]
@@ -796,6 +840,10 @@ pyphen = [
     {file = "pyphen-0.12.0-py3-none-any.whl", hash = "sha256:459020cd320eb200c0c5ba46b98b2278fd34c5546f520fdcd2ce5f8d733eb994"},
     {file = "pyphen-0.12.0.tar.gz", hash = "sha256:b7d3dfc24b6f2178cdb2b1757ace0bd5d222de3e62c28d22ac578c5f22a13e9b"},
 ]
+pytz = [
+    {file = "pytz-2021.3-py2.py3-none-any.whl", hash = "sha256:3672058bc3453457b622aab7a1c3bfd5ab0bdae451512f6cf25f64ed37f5b87c"},
+    {file = "pytz-2021.3.tar.gz", hash = "sha256:acad2d8b20a1af07d4e4c9d2e9285c5ed9104354062f275f3fcd88dcef4f1326"},
+]
 qrcode = [
     {file = "qrcode-7.3.1.tar.gz", hash = "sha256:375a6ff240ca9bd41adc070428b5dfc1dcfbb0f2507f1ac848f6cded38956578"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ email-validator = "^1.1.3"
 WTForms="^3.0.1"
 WeasyPrint="52.5"
 djhtml = "^1.4.11"
+Flask-Babel = "^2.0.0"
 
 [tool.poetry.dev-dependencies]
 black = "^21.12b0"