我正在为我的书签扩展程序开发用户身份验证。该扩展程序适用于http://ting-1.appspot.com/的Google App Engine（Python）后端。
首次展开广告时，background.html会在新标签页中打开options.html，然后用户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!""")
如果用户点击应用中电子邮件AuthReceive处理程序中的链接，则会处理请求并向扩展程序发送确认。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，如何将确认信息发送回分机？我是否再次使用XMLHttpRequest？怎么样？我需要在扩展名上放什么样的听众？
以下是应用中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
#--------------------------------------
...
在background.html中
//...
// add listener and save the variable to localStorage
//...
感谢您的帮助。
更新
这是符合Moishe's answer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
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)
答案 0 :(得分：4)
您可以使用Channel API来完成此操作。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，请向为该用户扩展创建的频道发送消息。
更多细节：
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，当用户点击该链接时，它会向authHandler路径发出HTTP请求，其中user_id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，您可以执行用户验证其电子邮件地址所需的任何操作。
希望有所帮助！