feat(core): add edge and last-modified header, close #338

lib/middleware/header.js

@@ -1,3 +1,4 @@
+const etagCalculate = require('etag');
 const logger = require('../utils/logger');
 const config = require('../config');
 const headers = {
@@ -11,5 +12,27 @@ const headers = {
 module.exports = async (ctx, next) => {
     logger.info(`${ctx.url}, user IP: ${ctx.ips[0] || ctx.ip}`);
     ctx.set(headers);
+
     await next();
+
+    let body = ctx.body;
+    if (!body || typeof body !== 'string' || ctx.response.get('ETag')) {
+        return;
+    }
+
+    const status = (ctx.status / 100) | 0;
+    if (2 !== status) {
+        return;
+    }
+
+    const match = body.match(/<lastBuildDate>(.*)<\/lastBuildDate>/);
+    if (match) {
+        ctx.set({
+            'Last-Modified': body.match(/<lastBuildDate>(.*)<\/lastBuildDate>/)[1],
+        });
+    }
+
+    body = body.replace(/<lastBuildDate>(.*)<\/lastBuildDate>/, '');
+
+    ctx.response.etag = etagCalculate(body);
 };

package.json

@@ -55,6 +55,7 @@
     "co-redis": "2.1.1",
     "currency-symbol-map": "4.0.4",
     "dayjs": "1.8.12",
+    "etag": "1.8.1",
     "form-data": "2.3.3",
     "git-rev-sync": "1.12.0",
     "googleapis": "39.2.0",

test/middleware/header.js

@@ -15,5 +15,7 @@ describe('header', () => {
         expect(response.headers['access-control-allow-methods']).toBe('GET');
         expect(response.headers['content-type']).toBe('application/xml; charset=utf-8');
         expect(response.headers['cache-control']).toBe(`max-age=${config.cacheExpire / 2}`);
+        expect(response.headers['last-modified']).toBe(response.text.match(/<lastBuildDate>(.*)<\/lastBuildDate>/)[1]);
+        expect(response.headers.etag).toBe('"b37-MORyrF0tJ8BFw0xLLZL/zBYAFPY"');
     });
 });

yarn.lock

@@ -3877,7 +3877,7 @@ esutils@^2.0.2:
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
   integrity sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=
 
-etag@~1.8.1:
+etag@1.8.1, etag@~1.8.1:
   version "1.8.1"
   resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
   integrity sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=