7.2 KiB
+++ 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://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.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
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创建一个公开的存储桶并上传文件
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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>/......
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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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在 页面规则 里 创建页面规则
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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
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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
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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
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Workers - 管理 Workers
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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。
'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; } -
添加完后设置路由
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地址为
<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