使用功能在Firebase上服务i18n角度应用程序 [英] Serve an i18n angular app on Firebase using functions
问题描述
我正在尝试正确处理对Firebase上托管的本地化角度应用程序的请求.目标是根据以下条件加载正确的应用程序包:1)名为locale
的cookie. 2)accept-language
标头. 3)当其他人不可用时,默认为en-us
.
I'm trying to handle requests correctly to a localized angular app hosted on Firebase. The goal is to load the right app bundle depending on: 1) A cookie named locale
. 2) The accept-language
header. 3) Default to en-us
when others are unavailable.
在使用i18n本地化角度应用程序时,angular-cli会为angular.json
中存在的每种语言/地区生成捆绑包(您的应用程序的版本). Firebase将您的捆绑包作为静态内容提供,并且具有严格的安全度量,不允许遍历路径.
When localizing angular apps with i18n, angular-cli generates bundles (versions of your app) for each language/locale present in angular.json
. Firebase serves your bundles as static content and it has serious security measurements disallowing path traversals.
我尝试在firebase.json
中同时设置 rewrites 和 redirects ,但是没有拦截locale
cookie的功能.然后,我使用云函数读取Cookie,解析请求并使用express
,cookie-parser
和express-locale
返回正确的资源.
I tried both setting rewrites and redirects in firebase.json
but there is no facilities to intercept the locale
cookie. Then, I used cloud functions to read the cookie, parse requests and return the right resource using express
, cookie-parser
and express-locale
.
1.仅使用托管
firebase.json
firebase.json
{
"hosting": {
"public": "dist",
"ignore": [
"firebase.json",
"**/.*",
"**/node_modules/**"
],
"rewrites": [
{
"source": "/en-us/**",
"destination": "/en-us/index.html"
},
{
"source": "/es-co/**",
"destination": "/es-co/index.html"
},
{
"source": "/zh-hans/**",
"destination": "/zh-hans/index.html"
},
{
"source": "**",
"destination": "/en-us/index.html"
}
]
}
}
2.使用云功能并表达
firebase.json
firebase.json
{
"functions": {
"predeploy": [
"npm --prefix \"$RESOURCE_DIR\" run lint"
]
},
"hosting": {
"public": "dist",
"ignore": [
"firebase.json",
"**/.*",
"**/node_modules/**"
],
"rewrites": [
{
"source": "**",
"function": "multilang"
}
]
}
}
functions/index.js
functions/index.js
const express = require('express')
const expressLocale = require('express-locale')
const cookieParser = require('cookie-parser')
const functions = require('firebase-functions')
const path = require('path')
const fs = require('fs')
const _ = require('lodash')
const app = express()
const localeMap = {
en: 'en_US',
es: 'es_CO',
zh: 'zh_TW',
'en-US': 'en_US',
'es-CO': 'es_CO',
'zh-TW': 'zh_TW',
'zh-Hans': 'zh_TW',
en_US: 'en_US',
es_CO: 'es_CO',
zh_TW: 'zh_TW',
zh_Hans: 'zh_TW'
}
const defaultLocale = 'en_US'
const baseMap = {
en_US: 'en-us',
es_CO: 'es-co',
zh_TW: 'zh-hans'
}
app
.use(cookieParser())
.use(expressLocale({
priority: ['cookie', 'accept-language', 'map', 'default'],
default: defaultLocale,
map: localeMap
}))
.use('**', (req, res, next) => {
const locale = localeMap[req.locale.language]
const sanitized = req.originalUrl.replace(/\.{2,}/g, '').replace(/\/{2,}/g, '/')
const url = sanitized.split('/')
const idx = url.length === 1 ? 0 : 1
url[0] = _.values(baseMap).includes(url[idx]) ?
url[idx] : (baseMap[locale] || baseMap[defaultLocale])
if (url.length > 1 && url[0] === url[1]) {
url.shift()
}
let file = path.resolve(`dist/${url.join('/')}`)
if (!url[url.length - 1].match(/^[\w,\s-]+\.[a-z0-9]{2,4}$/) || !fs.existsSync(file)) {
file = path.resolve(`dist/${url[0]}/index.html`)
}
res.sendFile(file)
})
exports.multilang = functions.https.onRequest(app)
最后的设置非常适合index.html或其他任何请求文件的本地Firebase仿真解析路径(例如,对于渐进式应用程序的支持,请说ngsw-worker.js
).
The last settings work well for a local Firebase emulation resolving path to index.html or any other requested file (say it ngsw-worker.js
for progressive apps support).
部署到Firebase时,即使将路径更改为:
When deploying to Firebase it fails resolving and finding the hosted files (e.g. index.html
), even if you change path to:
-
/${url[0]}/index.html
-
../${url[0]}/index.html
-
/public/${url[0]}/index.html
/${url[0]}/index.html
../${url[0]}/index.html
/public/${url[0]}/index.html
或将req.sendFile
重写为req.redirect
.
感谢您的帮助.
推荐答案
对于遇到相同问题的任何人,这是一个使用firebase函数的幼稚解决方案:
For anyone facing the same problem, here is a naive solution using firebase functions:
const express = require('express')
const cookieParser = require('cookie-parser')
const expressLocale = require('express-locale')
const functions = require('firebase-functions')
const localeMap = {
en: 'en_US',
es: 'es_CO',
zh: 'zh_CN',
en_US: 'en_US',
es_CO: 'es_CO',
zh_Hans: 'zh_CN'
}
const prefixMap = {
en_US: 'en-us',
es_CO: 'es-co',
zh_CN: 'zh-hans',
}
const defaultLocale = 'en_US'
const app = express()
app
.use(cookieParser())
.use(expressLocale({
priority: ['cookie', 'accept-language', 'map', 'default'],
default: defaultLocale,
map: localeMap
}))
.use('*', (req, res, next) => {
const locale = localeMap[req.locale.language]
const prefix = prefixMap[locale] || prefixMap[defaultLocale]
res.redirect(`/${prefix}${req.originalUrl}`)
})
exports.multilang = functions.https.onRequest(app)
firebase.json
{
"functions": {
"predeploy": [
"npm --prefix \"$RESOURCE_DIR\" run lint"
]
},
"hosting": {
"public": "dist/your-app-name",
"ignore": [
"firebase.json",
"**/.*",
"**/node_modules/**"
],
"rewrites": [
{
"source": "/en-us/**",
"destination": "/en-us/index.html"
},
{
"source": "/es-co/**",
"destination": "/es-co/index.html"
},
{
"source": "/zh-hans/**",
"destination": "/zh-hans/index.html"
},
{
"source": "**",
"function": "multilang"
}
]
}
}
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