hostnames 2 prefix hook implementation

Author: Rolando Santamaria Maso

lib/hostnames-hook.js

@@ -0,0 +1,40 @@
+'use strict'
+
+let micromatch
+try {
+  micromatch = require('micromatch')
+} catch (e) {
+  micromatch = {
+    isMatch (value, pattern) {
+      return value === pattern
+    }
+  }
+}
+
+module.exports = hostname2prefix => {
+  const matches = {}
+
+  return (req, res, cb) => {
+    if (req.headers.host) {
+      const hostHeader = req.headers.host.split(':')[0]
+      let prefix = matches[hostHeader]
+
+      if (!prefix) {
+        for (const e of hostname2prefix) {
+          if (micromatch.isMatch(hostHeader, e.hostname)) {
+            prefix = e.prefix
+            matches[hostHeader] = prefix
+
+            break
+          }
+        }
+      }
+
+      if (prefix) {
+        req.url = prefix + req.url
+      }
+    }
+
+    return cb()
+  }
+}

test/hostnames-hook.test.js

@@ -0,0 +1,77 @@
+'use strict'
+
+/* global describe, it */
+const expect = require('chai').expect
+
+describe('hostnames-hook', () => {
+  let hostnamesHook = null
+
+  it('initialize', async () => {
+    hostnamesHook = require('./../lib/hostnames-hook')([{
+      prefix: '/nodejs',
+      hostname: 'nodejs.org'
+    }, {
+      prefix: '/github',
+      hostname: 'github.com'
+    }, {
+      prefix: '/users',
+      hostname: '*.company.tld'
+    }])
+  })
+
+  it('is match - nodejs.org', (cb) => {
+    const req = {
+      headers: {
+        host: 'nodejs.org:443'
+      },
+      url: '/about'
+    }
+
+    hostnamesHook(req, null, () => {
+      expect(req.url).to.equal('/nodejs/about')
+      cb()
+    })
+  })
+
+  it('is match - github.com', (cb) => {
+    const req = {
+      headers: {
+        host: 'github.com:443'
+      },
+      url: '/about'
+    }
+
+    hostnamesHook(req, null, () => {
+      expect(req.url).to.equal('/github/about')
+      cb()
+    })
+  })
+
+  it('is match - wildcard', (cb) => {
+    const req = {
+      headers: {
+        host: 'kyberneees.company.tld:443'
+      },
+      url: '/about'
+    }
+
+    hostnamesHook(req, null, () => {
+      expect(req.url).to.equal('/users/about')
+      cb()
+    })
+  })
+
+  it('is not match - 404', (cb) => {
+    const req = {
+      headers: {
+        host: 'facebook.com:443'
+      },
+      url: '/about'
+    }
+
+    hostnamesHook(req, null, () => {
+      expect(req.url).to.equal('/about')
+      cb()
+    })
+  })
+})