cloudflare js worker允许国家列表并阻止其余国家

Question

addEventListener('fetch', event => {
  event.respondWith(blockCountries(event.request))
})

//Add countries to this Set to block them
const countries = new Set([  
  "US", // United States
  "SG", // Singapore 
  "BR"  // Brazil
])

async function blockCountries(request) {
  // Get country value from request headers
  let country = request.headers.get('cf-ipcountry')

  // Find out if country is on the block list
  let countryBlocked = countries.has(country)

  // If it's on the blocked list, give back a 403
  if (countryBlocked){
    return new Response("This page not available in your country",
        { status: 403, statusText: "Forbidden" })
  }

  // Catch-all return of the original response
  return await fetch(request)
}

有什么调整的技巧吗

Answer 1

为了进行此更改，您可以更改以下内容：

let countryBlocked = countries.has(country)

对此：（注意感叹号）

let countryBlocked = !countries.has(country)

感叹号是not运算符。因此，如果此请求的国家不在允许的国家集中，则此更改将把countryblocked设置为true。

addEventListener('fetch', event => {
  event.respondWith(blockCountries(event.request))
})

// Add countries to this Set to allow them
const countries = new Set([  
  "US", // United States
  "SG", // Singapore 
  "BR"  // Brazil
])

async function blockCountries(request) {
  // Get country value from request headers
  let country = request.headers.get('cf-ipcountry')

  // Check if country is on the allowed list
  let countryBlocked = !countries.has(country)

  // If it's not on the allowed list, give back a 403
  if (countryBlocked){
    return new Response("This page not available in your country",
        { status: 403, statusText: "Forbidden" })
  }

  // Catch-all return of the original response
  return await fetch(request)
}