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75 lines
2.2 KiB
75 lines
2.2 KiB
8 years ago
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/**
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this middleware is responsible for negotiating HTTP locales for incoming
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browser requests by reading 'Accept-Language' request headers.
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the preferred language will then be available on the $req object:
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eg. for 'Accept-Language: fr':
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```
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console.log( req.language );
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{
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name: 'French',
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type: 'living',
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scope: 'individual',
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iso6393: 'fra',
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iso6392B: 'fre',
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iso6392T: 'fra',
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iso6391: 'fr',
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defaulted: false
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}
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```
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for configuration options see:
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https://github.com/florrain/locale
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**/
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const locale = require('locale');
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/**
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BCP47 language tags can contain three parts:
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1. A language subtag (en, zh).
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2. A script subtag (Hant, Latn).
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3. A region subtag (US, CN).
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at time of writing we will only be concerned with 1. (the language subtag) with
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the intention of being compatible with the language standard of whosonfirst data.
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whosonfirst data is in ISO 639-3 format so we will need to configure the library
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to support all ISO 639-1 (2 char) codes and convert them to 639-1 (3-char) codes.
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see: https://github.com/whosonfirst/whosonfirst-names
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**/
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const iso6393 = require('iso-639-3');
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// create a dictionary which maps the ISO 639-1 language subtags to a map
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// of it's represenation in several different standards.
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const language = {};
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iso6393.filter( i => !!i.iso6391 ).forEach( i => language[ i.iso6391 ] = i );
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// a pre-processed locale list of language subtags we support (all of them).
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const allLocales = new locale.Locales( Object.keys( language ) );
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// return the middleware
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module.exports = function middleware( req, res, next ){
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// parse request & choose best locale
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var locales = new locale.Locales( req.headers['accept-language'] || '' );
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var best = locales.best( allLocales );
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// set $req.language property
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req.language = language[ best.language ] || language.en;
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req.language.defaulted = best.defaulted;
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// set $req.clean property in order to print language info in response header
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req.clean = req.clean || {};
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req.clean.lang = {
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name: req.language.name,
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iso6391: req.language.iso6391,
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iso6393: req.language.iso6393,
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defaulted: req.language.defaulted
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};
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next();
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};
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