Python flask web application with multilanguages support by host and prefix

Question

I have one server with flask application instance and have several domain which mapped to this server by DNS.

My site must support several languages by host and pref

Answer 1

I worked on something similar few months back. I modified it a bit and pushed to github. You can do what codegeek suggested if you are unable to make your templates language neutral. With this method you can cut down on the template files needed.

https://github.com/scragg0x/Flask-Localisation-Example

mysite.py

from flask import Flask, Blueprint, g, redirect, request

app = Flask(__name__)

mod = Blueprint('mysite', __name__, url_prefix='/')

sites = {
    'mysite.com': 'en',
    'myothersite.com': 'fr'
}

@app.url_defaults
def add_language_code(endpoint, values):
    values.setdefault('lang_code', g.lang_code)

@app.url_value_preprocessor
def pull_lang_code(endpoint, values):
    url = request.url.split('/', 3)
    g.lang_code = sites[url[2]]

@mod.url_defaults
def add_language_code(endpoint, values):
    values.setdefault('lang_code', g.lang_code)

@mod.url_value_preprocessor
def pull_lang_code(endpoint, values):
    g.lang_code = values.pop('lang_code')

@app.route('/')
@mod.route('/')
def index():
    # Use g.lang_code to pull localized data for template
    return 'lang = %s' % g.lang_code

app.register_blueprint(mod)

tests.py

import os
import unittest
import re
import requests
import urllib2
import json
from mysite import app

class MySiteTestCase(unittest.TestCase):

    def setUp(self):
        app.config['TESTING'] = True
        app.config['SERVER_NAME'] = 'mysite.com'
        self.domain = 'http://mysite.com/'
        self.app = app.test_client()

    def tearDown(self):
        pass

    def test_en_index(self):
        rv = self.app.get('/en/', self.domain)
        self.assertEqual(rv.data, 'lang = en')
        print self.domain, rv.data

    def test_fr_index(self):
        rv = self.app.get('/fr/', self.domain)
        self.assertEqual(rv.data, 'lang = fr')
        print self.domain, rv.data

    def test_default(self):
        rv = self.app.get('/', self.domain)
        self.assertEqual(rv.data, 'lang = en')
        print self.domain, rv.data

class MyOtherSiteTestCase(unittest.TestCase):

    def setUp(self):
        app.config['TESTING'] = True
        app.config['SERVER_NAME'] = 'myothersite.com'
        self.domain = 'http://myothersite.com/'
        self.app = app.test_client()

    def tearDown(self):
        pass

    def test_en_index(self):
        rv = self.app.get('/en/', self.domain)
        self.assertEqual(rv.data, 'lang = en')
        print self.domain, rv.data

    def test_fr_index(self):
        rv = self.app.get('/fr/', self.domain)
        self.assertEqual(rv.data, 'lang = fr')
        print self.domain, rv.data

    def test_default(self):
        rv = self.app.get('/', self.domain)
        self.assertEqual(rv.data, 'lang = fr')
        print self.domain, rv.data

if __name__ == '__main__':
    unittest.main()