+++
author = "FlintyLemming"
title = "Backblaze B2 + CloudFlare 搭建图床"
slug = "67b8601211284a25b68bb8afe65b80a7"
date = "2020-12-15"
description = ""
categories = ["Network", "MineService"]
tags = ["Backblaze", "CloudFlare", "图床"]
image = "https://gitee.com/flintylemming/mitsea-public-source/raw/master/images/blog/posts/2020/12/Backblaze%20B2%20%2B%20CloudFlare%20%E6%90%AD%E5%BB%BA%E5%9B%BE%E5%BA%8A/c-m-X_j3b4rqnlk-unsplash.avif"
+++
Backblaze B2 在大厂的对象存储里算是非常便宜的了，如果不考虑国内访问速度，应该是非常不错的选择。由于 B2 与 CloudFlare 合作，所以套上 CloudFlare 后并不会消耗流量，所以拿来做图床是个不错的选择，下面介绍下步骤。
## 配置 CDN
以下步骤参考官方教程
[Using Backblaze B2 with the Cloudflare CDN](https://help.backblaze.com/hc/en-us/articles/217666928-Using-Backblaze-B2-with-the-Cloudflare-CDN)
1. 创建一个公开的存储桶并上传文件
2. 通过查看文件详细信息获得地址，比如我这里就是
```
https://f002.backblazeb2.com/file/<存储桶名称>/......
```
3. 在 CloudFlare 里新建一条 CNAME 解析，地址就填刚才获得的这个 f002.backblazeb2.com
4. 在 页面规则 里 创建页面规则
5. URL 匹配填写如下内容
```
https://<刚才解析的域名>/file/<存储桶>/*
```
添加设置中选择 缓存级别 - 缓存所有内容
6. 再添加一条
URL 匹配填写如下内容
```
https://<解析的域名>/file/*/*
```
设置填写 转发 URL - 302重定向 - [https://secure.backblaze.com/404notfound](https://secure.backblaze.com/404notfound)
7. 设定缓存控制时间，内容如下
```
{"cache-control":"max-age=720000"}
```
## 隐藏 Bucket 名称
这样设置完后，虽然能免流了，但是 Bucket 名称还是暴露了，为了避免被人搞事情，所以要隐藏 Bucket 名称。这里用到了 cf 的 workers，参考下面站点的内容。
[Using Backblaze B2 and Cloudflare Workers for free image hosting](https://jross.me/free-personal-image-hosting-with-backblaze-b2-and-cloudflare-workers/)
1. Workers - 管理 Workers
2. 添加一个 Worker 并部署，内容如下。你需要做的就是修改开头的 b2Domain 和 b2Bucket 两个变量即可。
```jsx
'use strict';
const b2Domain = 'files.jross.me'; // configure this as per instructions above
const b2Bucket = 'jross-files'; // configure this as per instructions above
const b2UrlPath = `/file/${b2Bucket}/`;
addEventListener('fetch', event => {
return event.respondWith(fileReq(event));
});
// define the file extensions we wish to add basic access control headers to
const corsFileTypes = ['png', 'jpg', 'gif', 'jpeg', 'webp'];
// backblaze returns some additional headers that are useful for debugging, but unnecessary in production. We can remove these to save some size
const removeHeaders = [
'x-bz-content-sha1',
'x-bz-file-id',
'x-bz-file-name',
'x-bz-info-src_last_modified_millis',
'X-Bz-Upload-Timestamp',
'Expires'
];
const expiration = 31536000; // override browser cache for images - 1 year
// define a function we can re-use to fix headers
const fixHeaders = function(url, status, headers){
let newHdrs = new Headers(headers);
// add basic cors headers for images
if(corsFileTypes.includes(url.pathname.split('.').pop())){
newHdrs.set('Access-Control-Allow-Origin', '*');
}
// override browser cache for files when 200
if(status === 200){
newHdrs.set('Cache-Control', "public, max-age=" + expiration);
}else{
// only cache other things for 5 minutes
newHdrs.set('Cache-Control', 'public, max-age=300');
}
// set ETag for efficient caching where possible
const ETag = newHdrs.get('x-bz-content-sha1') || newHdrs.get('x-bz-info-src_last_modified_millis') || newHdrs.get('x-bz-file-id');
if(ETag){
newHdrs.set('ETag', ETag);
}
// remove unnecessary headers
removeHeaders.forEach(header => {
newHdrs.delete(header);
});
return newHdrs;
};
async function fileReq(event){
const cache = caches.default; // Cloudflare edge caching
const url = new URL(event.request.url);
if(url.host === b2Domain && !url.pathname.startsWith(b2UrlPath)){
url.pathname = b2UrlPath + url.pathname;
}
let response = await cache.match(url); // try to find match for this request in the edge cache
if(response){
// use cache found on Cloudflare edge. Set X-Worker-Cache header for helpful debug
let newHdrs = fixHeaders(url, response.status, response.headers);
newHdrs.set('X-Worker-Cache', "true");
return new Response(response.body, {
status: response.status,
statusText: response.statusText,
headers: newHdrs
});
}
// no cache, fetch image, apply Cloudflare lossless compression
response = await fetch(url, {cf: {polish: "lossless"}});
let newHdrs = fixHeaders(url, response.status, response.headers);
response = new Response(response.body, {
status: response.status,
statusText: response.statusText,
headers: newHdrs
});
event.waitUntil(cache.put(url, response.clone()));
return response;
}
```
3. 添加完后设置路由
4. 地址为
```jsx
<解析的域名>/*
```
Worker 就选择刚才添加的 Worker
然后就可以直接通过 https://<域名>/<Bucket内路径> 引用文件了
> Photo by [C M](https://unsplash.com/@ubahnverleih?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText) on [Unsplash](https://unsplash.com/s/photos/archive?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText)