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content/post/67b8601211284a25b68bb8afe65b80a7/index.zh-cn.md
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author = "FlintyLemming"
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title = "Backblaze B2 + CloudFlare 搭建图床"
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slug = "67b8601211284a25b68bb8afe65b80a7"
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date = "2020-12-15"
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description = ""
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categories = ["Network", "MineService"]
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tags = ["Backblaze", "CloudFlare", "图床"]
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image = "https://img.mitsea.com/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.jpg?x-oss-process=style/ImageCompress"
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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。
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# 配置 CDN
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以下步骤参考官方教程
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[Using Backblaze B2 with the Cloudflare CDN](https://help.backblaze.com/hc/en-us/articles/217666928-Using-Backblaze-B2-with-the-Cloudflare-CDN)
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1. 创建一个公开的存储桶并上传文件
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2. 通过查看文件详细信息获得地址，比如我这里就是
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```
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https://f002.backblazeb2.com/file/<存储桶名称>/......
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```
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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
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4. 在 页面规则 里 创建页面规则
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5. URL 匹配填写如下内容
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```
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https://<刚才解析的域名>/file/<存储桶>/*
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```
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添加设置中选择 缓存级别 - 缓存所有内容
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6. 再添加一条
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URL 匹配填写如下内容
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```
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https://<解析的域名>/file/*/*
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```
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设置填写 转发 URL - 302重定向 - [https://secure.backblaze.com/404notfound](https://secure.backblaze.com/404notfound)
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7. 设定缓存控制时间，内容如下
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```
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{"cache-control":"max-age=720000"}
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```
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# 隐藏 Bucket 名称
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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。
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[Using Backblaze B2 and Cloudflare Workers for free image hosting](https://jross.me/free-personal-image-hosting-with-backblaze-b2-and-cloudflare-workers/)
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1. Workers - 管理 Workers
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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。
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```jsx
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'use strict';
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const b2Domain = 'files.jross.me'; // configure this as per instructions above
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const b2Bucket = 'jross-files'; // configure this as per instructions above
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const b2UrlPath = `/file/${b2Bucket}/`;
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addEventListener('fetch', event => {
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return event.respondWith(fileReq(event));
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});
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// define the file extensions we wish to add basic access control headers to
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const corsFileTypes = ['png', 'jpg', 'gif', 'jpeg', 'webp'];
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// backblaze returns some additional headers that are useful for debugging, but unnecessary in production. We can remove these to save some size
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const removeHeaders = [
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'x-bz-content-sha1',
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'x-bz-file-id',
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'x-bz-file-name',
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'x-bz-info-src_last_modified_millis',
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'X-Bz-Upload-Timestamp',
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'Expires'
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];
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const expiration = 31536000; // override browser cache for images - 1 year
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// define a function we can re-use to fix headers
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const fixHeaders = function(url, status, headers){
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let newHdrs = new Headers(headers);
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// add basic cors headers for images
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if(corsFileTypes.includes(url.pathname.split('.').pop())){
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newHdrs.set('Access-Control-Allow-Origin', '*');
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}
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// override browser cache for files when 200
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if(status === 200){
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newHdrs.set('Cache-Control', "public, max-age=" + expiration);
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}else{
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// only cache other things for 5 minutes
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newHdrs.set('Cache-Control', 'public, max-age=300');
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}
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// set ETag for efficient caching where possible
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const ETag = newHdrs.get('x-bz-content-sha1') || newHdrs.get('x-bz-info-src_last_modified_millis') || newHdrs.get('x-bz-file-id');
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if(ETag){
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newHdrs.set('ETag', ETag);
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}
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// remove unnecessary headers
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removeHeaders.forEach(header => {
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newHdrs.delete(header);
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});
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return newHdrs;
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};
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async function fileReq(event){
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const cache = caches.default; // Cloudflare edge caching
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const url = new URL(event.request.url);
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if(url.host === b2Domain && !url.pathname.startsWith(b2UrlPath)){
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url.pathname = b2UrlPath + url.pathname;
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}
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let response = await cache.match(url); // try to find match for this request in the edge cache
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if(response){
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// use cache found on Cloudflare edge. Set X-Worker-Cache header for helpful debug
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let newHdrs = fixHeaders(url, response.status, response.headers);
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newHdrs.set('X-Worker-Cache', "true");
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return new Response(response.body, {
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status: response.status,
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statusText: response.statusText,
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headers: newHdrs
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});
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}
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// no cache, fetch image, apply Cloudflare lossless compression
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response = await fetch(url, {cf: {polish: "lossless"}});
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let newHdrs = fixHeaders(url, response.status, response.headers);
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response = new Response(response.body, {
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status: response.status,
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statusText: response.statusText,
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headers: newHdrs
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});
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event.waitUntil(cache.put(url, response.clone()));
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return response;
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}
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```
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3. 添加完后设置路由
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4. 地址为
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```jsx
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<解析的域名>/*
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```
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Worker 就选择刚才添加的 Worker
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然后就可以直接通过 https://<域名>/<Bucket内路径> 引用文件了
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> 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)
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