feat(config): mime config option support

Allows to setup required mime-type to extensions mapping
(for ex. fix default *.ts to video/mp2t mapping)

Closes #1735

docs/config/01-configuration-file.md

@@ -441,6 +441,23 @@ Note: Just about all additional reporters in Karma (other than progress) require
 If `true`, Karma will start and capture all configured browsers, run tests and then exit with an exit code of `0` or `1` depending
 on whether all tests passed or any tests failed.
 
+## mime
+**Type:** Object
+
+**Default:** `{}`
+
+**Description:** Redefine default mapping from file extensions to MIME-type 
+
+Set property name to required MIME, provide Array of extensions (without dots) as it's value
+
+**Example:**
+```javascript
+mime: {
+   'text/x-typescript': ['ts','tsx']
+   'text/plain' : ['mytxt']
+}
+```
+
 
 ## transports
 **Type:** Array

lib/middleware/common.js

@@ -4,6 +4,8 @@
 
 var mime = require('mime')
 var log = require('../logger').create('web-server')
+var helper = require('../helper')
+var _ = helper._
 
 var PromiseContainer = function () {
   var promise
@@ -92,9 +94,20 @@ var setHeavyCacheHeaders = function (response) {
   response.setHeader('Cache-Control', 'public, max-age=31536000')
 }
 
+var initializeMimeTypes = function (config) {
+  if (config && config.mime) {
+    _.forEach(config.mime, function (value, key) {
+      var map = {}
+      map[key] = value
+      mime.define(map)
+    })
+  }
+}
+
 // PUBLIC API
 exports.PromiseContainer = PromiseContainer
 exports.createServeFile = createServeFile
 exports.setNoCacheHeaders = setNoCacheHeaders
 exports.setHeavyCacheHeaders = setHeavyCacheHeaders
+exports.initializeMimeTypes = initializeMimeTypes
 exports.serve404 = serve404

lib/web-server.js

@@ -31,6 +31,7 @@ createCustomHandler.$inject = ['customFileHandlers', 'config.basePath']
 
 var createWebServer = function (injector, emitter, fileList) {
   var config = injector.get('config')
+  common.initializeMimeTypes(config)
   var serveStaticFile = common.createServeFile(fs, path.normalize(__dirname + '/../static'), config)
   var serveFile = common.createServeFile(fs, null, config)
   var filesPromise = new common.PromiseContainer()

test/unit/web-server.spec.js

@@ -4,6 +4,7 @@ import request from 'supertest-as-promised'
 import di from 'di'
 import mocks from 'mocks'
 import fs from 'fs'
+import mime from 'mime'
 
 describe('web-server', () => {
   var server
@@ -45,7 +46,8 @@ describe('web-server', () => {
         basePath: '/base/path',
         urlRoot: '/',
         middleware: ['custom'],
-        middlewareResponse: 'hello middleware!'
+        middlewareResponse: 'hello middleware!',
+        mime: {'custom/custom': ['custom']}
       }
 
       var injector = new di.Injector([{
@@ -71,6 +73,14 @@ describe('web-server', () => {
       server = injector.invoke(m.createWebServer)
     })
 
+    it('should setup mime', () => {
+      expect(mime.lookup('/my.custom')).to.equal('custom/custom')
+    })
+
+    it('should keep default mimes', () => {
+      expect(mime.lookup('/my.html')).to.equal('text/html')
+    })
+
     it('should serve client.html', () => {
       servedFiles(new Set())