利用 deno.dev 反代解决前端跨域以及 https 网页无法调用 http api 的问题

1. import { serve } from "https://deno.land/[email protected]/http/server.ts"
   
2. const suffixWhiteList = [
   
3.   'shuzijumin.com',
   
4.   'localhost',
   
5.   '127.0.0.1',
   
6. ]
   
7. serve(async (req: Request) => {
   
8.   const url = new URL(req.url)
   
9.   const targetUrl = url.href.replace(`${url.origin}/`, '')
   
10.   let urlObj: URL
    
11.   try {
    
12.     urlObj = new URL(targetUrl)
    
13.     let ifHostInWhiteList = false
    
14.     for (const suffix of suffixWhiteList) {
    
15.       if (urlObj.hostname.toLowerCase().endsWith(suffix)) {
    
16.         ifHostInWhiteList = true
    
17.         break
    
18.       }
    
19.     }
    
20.     if (!ifHostInWhiteList) {
    
21.       return new Response(`hostname suffix not in white list`, {status: 403})
    
22.     }
    
23.     if (['http:', 'https:'].indexOf(urlObj?.protocol) > -1) {
    
24.       let res = await fetch(targetUrl, {
    
25.         headers: req.headers,
    
26.         method: req.method,
    
27.         body: req.body,
    
28.       })
    
29.       let headers = {}
    
30.       res.headers.forEach((value, key) => {
    
31.         if (key.toLowerCase()!=='access-control-allow-origin') {
    
32.           headers[key] = value
    
33.         }
    
34.       })
    
35.       headers['Access-Control-Allow-Origin'] = '*'
    
36.       return new Response(res.body, { headers, status: res.status })
    
37.     }
    
38.   } catch (e) {
    
39.     console.error(e.message)
    
40.   }
    
41.   return new Response(`Usage: ${url.origin}/https://deno.com/deploy/docs/pricing-and-limits`)
    
42. })

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