Question

    $(window).on('unload', function() {
        db.flipCounter.get(gon.slug, function(obj) {
            var payload = {
                slug: gon.slug,
                localFlipCount: obj.fc,
                time: Date.now()
            }

            navigator.sendBeacon('/analytics', csrfProtect(payload))

        })
    })

    function csrfProtect(payload) {
        var param = $("meta[name=csrf-param]").attr("content")
        var token = $("meta[name=csrf-token]").attr("content")

        if (param && token) payload[param] = token
        return new Blob([JSON.stringify(payload)], { type: "application/x-www-form-urlencoded; charset=utf-8" })
    }

在上面的代码中，我希望使用有效负载命中POST到'/ analytics'网址。我在... ~~尝试触发请求时收到以下错误（警告）：~~

Promise.js：840未处理拒绝：TypeError：无法在字符串'{“slug”：“test-page-by-marvin-danig”，“localFlipCount”：1，“time”：1524241435403上创建属性'authenticity_token' ''

嗯。

...发出请求，我明白了：

Processing by BooksController#analytics as */*
  Parameters: {"{\"slug\":\"test-book-by-marvin-danig\",\"localFlipCount\":1,\"time\":1524243279653,\"param\":\"8rzDx/TNL8YeU1/NWgWSk6gB/UvmbB9Ip VajDCgfDUv5Q4pjh7x0GUG1il1jDJajtJyHf84Xv5Pt14fiCnA9w"=>"=\"}"}
Can't verify CSRF token authenticity.
exception
ActionController::InvalidAuthenticityToken

更新：问题仍未解决。这就是我现在所处的位置：

我有以下GET＆amp; POST路由在我的routes.rb上打开：

# Analytics (flipCounter)
  get 'auth_token', to: 'analytics#auth_token'
  post 'receptor', to: 'analytics#receptor', as: :receptor

这些显然映射到analytics_controller，如此：

class AnalyticsController < ApplicationController
    respond_to :js

  def auth_token
    session[:_csrf_token] = form_authenticity_token
  end

  def receptor
    logger.debug "Check book slug first: #{params}" 

    begin
      book = Book.friendly.find(params[:slug])
    rescue ActiveRecord::RecordNotFound => e
      book = nil
    end

    if book.exists?
      book.flipcount += params[:flipcount].to_i
    end

  end
    private

end

除auth_token方法外，我还获得了auth_token.json.erb模板，该模板按照以下方式发送：

{ "authenticity_token": "<%= session[:_csrf_token] %>" }

客户端javascript（糟糕的草稿）采用以下方式：

            // When state of book changes to `not_flipping`:

                flipCount += 1

                const o = { slug: gon.slug, fc: flipCount }

            // IndexedDb initiated elsewhere.
            db.transaction('rw', db.flipCounter, function(e) {
                db.flipCounter.put(o)
            }).then(function(e) {
                const URL = '/auth_token' // First fetch the authenticity_token!
                fetch(URL, {
                    method: 'GET'
                }).then(function(res) {
                    return res.json()
                }).then(function(token) {


                    return postBookData(token)


                }).catch(err => console.log(err))
            }).catch(function(e) {
                console.log(e)
            })


            function postBookData(token) {

                db.flipCounter.get(gon.slug, function(obj) {
                    // var payload = new FormData()

                    // payload.append('slug', gon.slug)
                    // payload.append('localFlipCount', obj.fc)
                    // payload.append('authenticity_token', token.authenticity_token)
                    // payload.append('type', 'application/x-www-form-urlencoded;')
                    // payload.append('charset=utf-8', 'ok')
                    //  payload.append('X-CSRF-Token', token.authenticity_token)

                    //var payload = { 'slug': gon.slug }

                    let body = {
                        slug: gon.slug,
                        flipcount: obj.fc,
                        time: Date.now()
                    }
                    let headers = {
                        type: 'application/x-www-form-urlencoded; charset=utf-8',
                        'X-CSRF-Token': token.authenticity_token
                    }
                    let blob = new Blob([JSON.stringify(body)], headers);
                    let url = '/receptor'

                    navigator.sendBeacon(url, blob);

                }).then(function() {
                    flipCount = 0
                    var o = { slug: gon.slug, fc: flipCount }
                }).catch(err => console.log(err))
            }

navigator.sendBeacon触发的请求对象不正确，因为X-CSRF-Token未设置，我显然在服务器端出现以下错误：

Started POST "/receptor" for 127.0.0.1 at 2018-04-26 09:00:33 -0400
Processing by AnalyticsController#receptor as */*
  Parameters: {"{\"slug\":\"bookiza-documentation-by-marvin-danig\",\"fc\":1}"=>nil}
Can't verify CSRF token authenticity.
exception
ActionController::InvalidAuthenticityToken
  Rendering public/500.html
  Rendered public/500.html (1.0ms)
Completed 500 Internal Server Error in 337ms (Views: 335.8ms | ActiveRecord: 0.0ms)

是否有人使用服务工作人员在完全离线的页面上在Rails应用上实施了navigator.sendBeacon方案？

Answer 1

刚抓住了这个障碍，我的解决方案的js结尾如下：

window.addEventListener("unload", function() {
  var url = "/your_metrics_path",
  data = new FormData(),
  token = $('meta[name="csrf-token"]').attr('content');
  // add your data
  data.append("foo", "bar");
  // add the auth token
  data.append("authenticity_token", token);
  // off she goes
  navigator.sendBeacon(url, data);
});

希望这会有所帮助。

Answer 2

You're on the right track, and I've successfully done this, grabbing the CSRF token from the DOM and using it in the JavaScript request. Here is an example of what a normal Rails form is sending in the params:

Started PATCH "/titles/25104" for 127.0.0.1 at 2018-04-20 14:19:11 -0700
Processing by TitlesController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"N97wNps0PMEBcqEsza8gNV741uPZNmltPgJHeeBNmTF0rc2KCaePBlZeCxId+su1sdAYMsgyd/78u9S/mdmprw==" }

It looks like you just need to get things into the right hash structure, and you should be on your way. I think you need to adjust some keys.

Answer 3

我刚刚了解到，在使用Beacon请求时，无法自定义请求方法，提供自定义请求标头或更改请求和响应的其他处理属性。请参阅W3C编辑器的信标草案here。

请改用fetch api。

在rails中处理navigator.sendBeacon请求的CSRF真实性令牌

3 个答案: