使用Cloudflare Workers反代IPFS网关

原文链接： https://blog.saky.site/post/ipfs_proxy/

Workers-Proxy 项目，可以通过 Cloudflare Workers 服务搭建一个反向代理服务器，已访问ipfs网关

通过下面的代码你可以使用 https://你的域名/哈希值来进行访问

如果删除upstream_path，则需要使用https://你的域名/ipfs/哈希值来进行访问

配置代码

const upstream = 'ipfs.io' 
const upstream_path = '/ipfs/' 
const upstream_mobile = 'ipfs.io' 
// 屏蔽国家和地区. 
const blocked_region = [''] 
// 屏蔽 IP 地址. 
const blocked_ip_address = ['0.0.0.0', '127.0.0.1'] 
// 镜像站是否开启 HTTPS. 
const https = true 
// 以下保持默认，不要动 
const replace_dict = { 
    '$upstream': '$custom_domain', 
    '//ipfs.io': '' 
} 
addEventListener('fetch', event => { 
    event.respondWith(fetchAndApply(event.request)); 
}) 
  
async function fetchAndApply(request) { 
  
    const region = request.headers.get('cf-ipcountry').toUpperCase(); 
    const ip_address = request.headers.get('cf-connecting-ip'); 
    const user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36" 
  
    let response = null; 
    let url = new URL(request.url); 
    let url_hostname = url.hostname; 
  
    if (https == true) { 
        url.protocol = 'https:'; 
    } else { 
        url.protocol = 'http:'; 
    } 
  
    if (await device_status(user_agent)) { 
        var upstream_domain = upstream; 
    } else { 
        var upstream_domain = upstream_mobile; 
    } 
  
    url.host = upstream_domain; 
    if (url.pathname == '/') { 
        url.pathname = upstream_path; 
    } else { 
        url.pathname = upstream_path + url.pathname; 
    } 
  
    if (blocked_region.includes(region)) { 
        response = new Response('Access denied: WorkersProxy is not available in your region yet.', { 
            status: 403 
        }); 
    } else if (blocked_ip_address.includes(ip_address)) { 
        response = new Response('Access denied: Your IP address is blocked by WorkersProxy.', { 
            status: 403 
        }); 
    } else { 
        let method = request.method; 
        let request_headers = request.headers; 
        let new_request_headers = new Headers(request_headers); 
  
        new_request_headers.set('Host', url.hostname); 
        new_request_headers.set('Referer', url.hostname); 
  
        let original_response = await fetch(url.href, { 
            method: method, 
            headers: new_request_headers 
        }) 
  
        let original_response_clone = original_response.clone(); 
        let original_text = null; 
        let response_headers = original_response.headers; 
        let new_response_headers = new Headers(response_headers); 
        let status = original_response.status; 
  
        new_response_headers.set('access-control-allow-origin', '*'); 
        new_response_headers.set('access-control-allow-credentials', true); 
        new_response_headers.delete('content-security-policy'); 
        new_response_headers.delete('content-security-policy-report-only'); 
        new_response_headers.delete('clear-site-data'); 
  
        const content_type = new_response_headers.get('content-type'); 
        if (content_type.includes('text/html') && content_type.includes('UTF-8')) { 
            original_text = await replace_response_text(original_response_clone, upstream_domain, url_hostname); 
        } else { 
            original_text = original_response_clone.body 
        } 
  
        response = new Response(original_text, { 
            status, 
            headers: new_response_headers 
        }) 
    } 
    return response; 
} 
  
async function replace_response_text(response, upstream_domain, host_name) { 
    let text = await response.text() 
  
    var i, j; 
    for (i in replace_dict) { 
        j = replace_dict[i] 
        if (i == '$upstream') { 
            i = upstream_domain 
        } else if (i == '$custom_domain') { 
            i = host_name 
        } 
  
        if (j == '$upstream') { 
            j = upstream_domain 
        } else if (j == '$custom_domain') { 
            j = host_name 
        } 
  
        let re = new RegExp(i, 'g') 
        text = text.replace(re, j); 
    } 
    return text; 
} 
  
  
async function device_status(user_agent_info) { 
    var agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"]; 
    var flag = true; 
    for (var v = 0; v < agents.length; v++) { 
        if (user_agent_info.indexOf(agents[v]) > 0) { 
            flag = false; 
            break; 
        } 
    } 
    return flag; 
} 

本文转自： https://blog.saky.site/post/ipfs_proxy/
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