Backblaze B2 數據存儲使用 Cloudflare Workers 加速
1. 在 Backblaze B2 文件上傳后
此時生成的外鏈 URL 為 https://cdn.taxiway.uk/file/{bucketName}/test.jpg
2. 前往 Cloudflare Workers 新建一個 Workers
// Website you intended to retrieve for users.
const upstream = 'cdn.taxiway.uk'
// Website you intended to retrieve for users using mobile devices.
const upstream_mobile = 'cdn.taxiway.uk'
// Countries and regions where you wish to suspend your service.
const blocked_region = []
// IP addresses which you wish to block from using your service.
const blocked_ip_address = ['0.0.0.0', '127.0.0.1']
// Whether to use HTTPS protocol for upstream address.
const https = true
// Replace texts.
const replace_dict = {
'$upstream': '$custom_domain',
'//google.com': ''
}
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 = request.headers.get('user-agent');
let response = null;
let url = new URL(request.url);
let url_host = url.host;
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 (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', upstream_domain);
new_request_headers.set('Referer', url.href);
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_host);
} 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;
}
編輯完成后,點擊 Save and Depoly
后完成部署
以上代碼來自於 https://github.com/Siujoeng-Lau/Workers-Proxy/blob/master/src/index.js
3. 前往你的自定義域名後台面板,進行 Worker 規則設置
新增一條記錄規則 https://your.domain.here/*
4. 前往你的自定義域名 DNS 面板,進行 DNS 解析規則設置
5. 之後就可以使用自定義域名去反代 B2 的外鏈 URL 了
https://your.domain.here/file/{bucketName}/test.jpg
6. 當然也可以試試看官方給出直接套用 CF 的 CDN 加速的方法
https://help.backblaze.com/hc/en-us/articles/217666928-Using-Backblaze-B2-with-the-Cloudflare-CDN
如果發現緩存不能完全命中,可以加上 {"cache-control":"max-age=43200"}
參數試試看