I am developing a user authentication for my bookmarking extension. The extension works with the Google App Engine (Python) backend at http://ting-1.appspot.com/.
The first time the extension runs, background.html opens options.html in a new tab and the user enters his email address. I send the email address to the app like this (not tried yet):
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);
In the app, the handler AuthSender sends the confirmation email to the user:
class AuthSender(webapp.RequestHandler):
def post(self):
new_user = self.request.get("extension_user")
mail.send_mail(
sender="Ting <[email protected]>",
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!""")
If the user clicks the link in the email AuthReceive handler in the app will process the request and send confirmation to the extension. But I could not figure out how to send the confirmation to the extension.
When the user clicks on the link, how can I send confirmation back to the extension? Do I use XMLHttpRequest again? How? And what kind of listener I need to put at the extension?
Below is a sketch of the AuthReceive handler in the app:
class AuthReceive(InboundMailHandler):
def receive(self, message):
#---------------------------------------
#receive email // I know this part
#send confirmation to extension // I need help with this
#--------------------------------------
...
And in background.html
//...
// add listener and save the variable to localStorage
//...
Thanks for your help.
UPDATE
This is the code to conform to Moishe's answer. Everything works except the last step: handler.onmessage is not triggered.
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 and 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 <[email protected]>"
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)
Working version
(Related question)
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 and 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 <[email protected]>"
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)
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