如何将数据发送到Chrome扩展程序？

Question

我正在为我的书签扩展开发用户身份验证。 该扩展程序适用于http://ting-1.appspot.com/上的Google App Engine（Python）后端。

第一次运行扩展程序时， background.html在新标签页中打开options.html ，并且用户会输入其电子邮件地址。 我将这样的电子邮件地址发送到应用程序（尚未尝试）：

in options.html
---------------

var formData = new FormData();

formData.append("extension_user", userEmail);

var xhr = new XMLHttpRequest();
xhr.open("POST", "http://ting-1.appspot.com/authsender", true);
xhr.send(formData);

在应用程序中，处理程序AuthSender将确认电子邮件发送给用户：

class AuthSender(webapp.RequestHandler):
    def post(self):
        new_user = self.request.get("extension_user") 
        mail.send_mail(
        sender="Ting <ting@gmail.com>",
        to=new_user,
        subject="Ting Bookmarking: confirm your email",
        body="""click on the link below to confirm your email: 
<a href="http://ting-1.appspot.com/authHandler"></a> 

Happy Bookmarking!""")

如果用户单击电子邮件中的链接，则应用程序中的AuthReceive处理程序将处理请求并向扩展发送确认。 但我无法弄清楚如何将确认发送到扩展程序。

当用户点击链接时，如何将确认发送回扩展程序？ 我是否再次使用XMLHttpRequest ？ 怎么样？ 我需要在扩展中放置什么样的听众？

下面是应用程序中AuthReceive处理程序的草图：

class AuthReceive(InboundMailHandler):
    def receive(self, message):

#---------------------------------------
        #receive email // I know this part
        #send confirmation to extension // I need help with this
#--------------------------------------
...

并在background.html

//...
// add listener and save the variable to localStorage
//...

谢谢你的帮助。

UPDATE

这是符合Moishe答案的代码。 除最后一步外，一切正常： handler.onmessage未被触发。

options.html

<html>
<head><title>Extension Options</title></head>
<body>
<p>Enter your gmail address:</p>

<textarea id="getEmail" style="margin-bottom: 4px; width: 250px; height: 20px">
</textarea><br />

<button id="save">Save</button>
<!--<button id="save">Clear</button>-->

<script type="text/javascript">

document.getElementById("getEmail").placeholder = "your gmail address" ;

//send entered gmail address to the server
document.getElementById("save").addEventListener
(
    "click", 
    function ()
    {
        var userEmail = document.getElementById("getEmail").value;
        var formData = new FormData();
        formData.append("extension_user", userEmail);

        var channel;
        var socket;
        var handler = new Object();
        handler.onmessage =
        function (evt)
        {   
            //evt.data will be what the server sends in channel.send_message
            console.log("evt.data received from authhandler: " + evt.data);
        };    

        var xhr = new XMLHttpRequest();
        xhr.onReadyStateChange = function()
        {
            //error handling etc not included
            if (xhr.readyState == 4 && xhr.status == 200)
            {
                token = xhr.responseText;
                channel = new goog.appengine.Channel(token);
                socket = channel.open(handler);
            }
        };
        xhr.open("POST", "http://ting-1.appspot.com/authsender", true);
        xhr.send(formData);
        console.log("formData sent to authsender: " + formData);

    }, false
)
//...
</script>
</body>
</html>

AuthSender和AuthHandler

class AuthSender(webapp.RequestHandler):
    def post(self):
        new_user = self.request.get("extension_user")
        link = "http://ting-1.appspot.com/authhandler?new_user=%s" % new_user

        message = mail.EmailMessage()
        message.sender="Ting <ting@gmail.com>"
        message.to=new_user
        message.subject="Ting Bookmarking - Confirm your email"
        message.body="""Click on the link to confirm your email: %s """ % link
        message.send()

        logging.info("message sent to: %s " % message.to)

        token = channel.create_channel(new_user)
        self.response.out.write(token)

class AuthHandler(webapp.RequestHandler):
    def get(self):
        new_user = self.request.get("new_user")

        channel.send_message(new_user, new_user)

        logging.info("new_user sent to client: %s" % new_user)

工作版

（相关问题）

options.html

<html>
<head>
    <title>Extension Options</title>
    <!-- this does not work because it is local url
    <script type="text/javascript" src="/_ah/channel/jsapi"></script>
    -->
    <script type="text/javascript" src="https://talkgadget.google.com/talkgadget/channel.js"></script>
</head>

<body>
<p>Enter your gmail address:</p>

<textarea id="getEmail" style="margin-bottom: 4px; width: 250px; height: 20px">
</textarea><br />

<button id="save">Save</button>

<script>
document.getElementById("getEmail").placeholder = "your gmail address" ;

document.getElementById("save").addEventListener
(
    "click", 
    function ()
    {
        var userEmail = document.getElementById("getEmail").value;
        var formData = new FormData();
        formData.append("extension_user", userEmail);

        var channel;
        var socket;
        var handler = 
        {
            onopen: function () { alert("onopen") },
            onerror: function () { alert("onerror") },
            onclose: function () { alert("onclose") },
            onmessage: 
            function (evt)
            {
                alert("evt.data is: " + evt.data)
            }
        };    

        var xhr = new XMLHttpRequest();
        xhr.onreadystatechange = function()
        {
            if (xhr.readyState == 4 && xhr.status == 200)
            {
                token = xhr.responseText;
                channel = new goog.appengine.Channel(token);
                socket = channel.open(handler);
            }
        };
        xhr.open("POST", "http://ting-1.appspot.com/authsender", true);
        xhr.send(formData);            
    }, false
)
</script>
</body>
</html>

AuthSender和AuthHandler

class AuthSender(webapp.RequestHandler):
    def post(self):
        new_user = self.request.get("extension_user")
        link = "http://ting-1.appspot.com/authhandler?new_user=%s" % new_user

        message = mail.EmailMessage()
        message.sender="Ting <ting@gmail.com>"
        message.to=new_user
        message.subject="Ting Bookmarking - Confirm your email"
        message.body="""Click on the link to confirm your email: %s """ % link
        message.send()

        token = channel.create_channel(new_user)

        self.response.out.write(token)

class AuthHandler(webapp.RequestHandler):
    def get(self):
        new_user = self.request.get("new_user")

        self.response.out.write(new_user)

        channel.send_message(new_user, new_user)

Answer 1

您可以使用Channel API来完成此任务。 在创建XMLHttpRequest的同时请求令牌，并打开通道以侦听消息。 当您的应用处理与用户点击链接相对应的HTTP请求时，请向为该用户的扩展创建的频道发送消息。

更多详情：

基本上，在制作XHR的options.html中，执行以下操作：

var channel;
var socket;
var handler = {
  onmessage: function(evt) {
    // evt.data will be what your server sends in channel.send_message
  }
};
var xhr = new XMLHttpRequest();
xhr.onReadyStateChange = function() {
  // error handling and whatnot elided
  if (xhr.readyState == 4 and xhr.status == 200) {
    // We got a response from the server. The responseText is
    // a channel token so we can listen for a "verified" message.
    token = xhr.responseText;
    channel = new goog.appengine.Channel(token);
    socket = channel.open(handler);
  }
};
xhr.open("POST", "http://ting-1.appspot.com/authsender", true);
xhr.send(formData);

然后在您的服务器上，'authsender'页面的处理程序将执行以下操作：

class AuthSenderHandler(webapp.RequestHandler):
  def post(self):
    # get whatever data is in the form to send an email.
    # let's say that user_id is a field we extracted either from a cookie or from
    # the POST parameters themselves.
    link = "http://your.server.com/authHandler?user_id=%s" % user_id
    message = mail.EmailMessage()
    message.body = """some stuff %s""" % link
    # fill in other message fields, then send it.

    # now we'll create a channel token using the user_id and return 
    # it to the client.
    token = channel.create_channel(user_id)
    self.response.out.write(token)

以上两个功能将让您的客户端在一个频道上收听。 下一步是：当用户点击链接时会发生什么？

之前，我们在包含user_id参数的电子邮件中发送了该链接（出于说明的目的，您可能想要使用其他内容）。 现在，当用户点击链接时，它将向authHandler路径发出HTTP请求，并以user_id作为参数。 因此我们可以使用user_id来识别要发送消息的频道，如下所示：

class AuthHandler(webapp.RequestHandler):
  def get(self):
    user_id = self.request.get("user_id")
    # send a message indicating the user received the email and
    # verified to our client page. You may want to send other data.
    channel.send_message(user_id, "authorized")
    # probably want to show a nice "you've been authorized" page or something

然后将调用handler.onmessage回调，您可以做任何您需要做的事情，因为用户已经验证了他们的电子邮件地址。

希望那有所帮助！

如何将数据发送到Chrome扩展程序？

问题描述

1 个解决方案

解决方案1
4 已采纳 2011-10-29 21:47:02

如何将数据发送到Chrome扩展程序？

问题描述

1 个解决方案

解决方案1 4 已采纳 2011-10-29 21:47:02

解决方案1
4 已采纳 2011-10-29 21:47:02