Does anyone know of a URL to get your Skype status using JSONP?
I've only found an XML status URL so far (http://mystatus.skype.com/username.xml).
(I'm trying to query Skype using AJAX. Yes, I could use a server-side proxy script to beat the cross-domain limits, but a direct call would be awesome.)
Simon.
Well apparently you can get a text-only version of the status by changing the extension to .txt:
http://mystatus.skype.com/username.txt
It will return "Online" or "Offline". About the Cross-domain AJAX, you can only do it via server and direct call is definitely not allowed.
You might change the headline to 'JSONP' instead of JSON. That's what you want.
JSONP hijacks cross domain fetches like this to work, without server proxies, by carrying the data in fetches. It's like the most hackish useful technology I come to mind, right now. :)
I nagged Skype about this - the easiest way out would be for their servers to have an official, documented JSONP interface. I hope they'll do that.
In the mean time, this is how I got the problem solved:
Placed this PHP script on my server, alongside the usual HTML: http://benalman.com/projects/php-simple-proxy/
Edited the configuration of it like so:
$enable_native = true;
$valid_url_regex = '/^http:\/\/mystatus\.skype\.com\/myuserid.*/';
This allows it to fetch (via curl running on the server) the mystatus.skype.com/myuserid.num (or .txt) information.
Fetching from JS with URL:
ba-simple-proxy.php?url=http%3A%2F%2Fmystatus.skype.com%2Fmyuserid.num&mode=native&full_status=1
That's it. Pheeew... :)
Also you can retrieve it using PHP
function getSkypeStatus($username) {
$data = file_get_contents('http://mystatus.skype.com/' . urlencode($username) . '.xml');
return strpos($data, '<presence xml:lang="en">Offline</presence>') ? 'Offline' : 'Online';
}
OR
function getSkypeStatus($username) {
$data = file_get_contents('http://mystatus.skype.com/' . urlencode($username) . '.xml');
preg_match('#<presence xml:lang="en">(.*?)</presence>#i', $data, $match);
return isset($match[1]) ? $match[1] : 'Error retrieving status';
}
Cheers!
Thanks to Bradgrafelman from - http://www.phpbuilder.com/board/showthread.php?t=10361050
Related
I am trying to get the Bitcoin course from a web server.
Then we try it with a JSON from local, it works.
In Firebug, I can see the get request to bitcoincharts.com, but there is no answer.
What's wrong with my code?
$('#LitecoinMenue').append('<p><b>Litecoin: 42</b></p>');
$.getJSON('http://api.bitcoincharts.com/v1/weighted_prices.json',
function(data){
$.each(data.USD, function(index,item){
$('#BitcoinMenue').append('<p><b>Bitcoin:'+ item+'</b></p>');
});
});
The reason your code doesn't work is because of a rule called Same-origin policy. This rule requires that all AJAX requests are made to a file on the same domain name. It is not possible to use $.getJSON, or any other AJAX function to load a file from an external domain.
There are only a few options available, the most common is to create a PHP file to act as a proxy, and store it on the same domain. For example:
proxy.php
<?php
$url = base64_decode($_GET['url']);
return file_get_contents($url);
?>
Your page above
$('#LitecoinMenue').append('<p><b>Litecoin: 42</b></p>');
$.getJSON('proxy.php?url=aHR0cDovL2FwaS5iaXRjb2luY2hhcnRzLmNvbS92MS93ZWlnaHRlZF9wcmljZXMuanNvbg==',
function(data){
$.each(data.USD, function(index,item){
$('#BitcoinMenue').append('<p><b>Bitcoin:'+ item+'</b></p>');
});
});
Important Notes:
This is just an example. In a real life situation you would probably want to use cURL to get your file. You should also ensure that it is secured so that someone cannot use Firebug to send an AJAX request to fetch a big file (like a movie) or your server could crash.
As you can see, the URL is base64 encoded. This is to ensure that it gets processed correctly as sometimes there are issues when passing an unencoded URL as a GET parameter. You can encode and decode base64 strings with these online converters: http://base64encode.org and http://base64decode.org, or you can use the built in PHP functions base64_encode() and base64_decode().
I'm new to backbone.js and I've read other solutions to similar problems but still can't get my example to work. I have a basic rails api that is returning some JSON from the url below and I am trying to access in through a backbone.js front end. Since they are one different servers I think I need to use a 'jsonp' request. I'm currently doing this by overriding the sync function in my backbone collection.
Api url:
http://guarded-wave-4073.herokuapp.com/api/v1/plans.json
sync: function(method, model, options) {
options.timeout = 10000;
options.dataType = 'jsonp';
options.url = 'http://guarded-wave-4073.herokuapp.com/api/v1/plans.json'
return Backbone.sync(method, model, options);
}
To test this I create a new 'plans' collection in my chrome console using "plans = new Plans()" and then "plans.fetch()" to try and get the JSON.
When I call plans.models afterwards I still have an empty array and the object that returns from plans.fetch() doesn't seem to have any json data included.
Any ideas where I'm going wrong?
I have had the same problem before. You should not have to override your sync method.
Taken from Stackoverflow Answer
"The JSONP technique uses a completely different mechanism for issuing HTTP requests to a server and acting on the response. It requires cooperating code in the client page and on the server. The server must have a URL that responds to HTTP "GET" requests with a block of JSON wrapped in a function call. Thus, you can't just do JSONP transactions to any old server; it must be a server that explicitly provides the functionality."
Are you sure your server abides to the above? Test with another compatible jsonp service (Twitter) to see if you receive results?
Have you tried overriding the fetch method as well?
You should add ?callback=? to your api url in order to enable jsonp
Here is my situation:
Im creating a widget that site admins can embed in their site and the data are stored in my server. So the script basically has to make an ajax request to a php file in my server to update the database. Right? Right :)
The ajax request works excellent when i run it in my local server but it does not work when the php file is on my ONLINE server.
This is the code im using:
var url = "http://www.mydomain.net/ajax_php.php";
var params = "com=ins&id=1&mail=mymail#site.net";
http.async = true;
http.open("POST", url, true);
http.onreadystatechange = function() {
if(http.readyState == 4 && http.status == 200) {
//do my things here
alert( http.responseText );
}
}
http.send(params);
In firebug it shows: http://www.mydomain.net/ajax_php.php 200 OK X 600ms.
When i check the ajax responnseText I always get a Status:0
Now my question is: "Can i do cross-domain ajax requests by default? Might this be a cross-domain ajax problem? Since it works when the requested file resides in my local server but DOESN'T work when the requested file is in another server, im thinking ajax requests to another remote server might be denied? Can you help me clear on this?
Thanks..
Cross-domain requests are not directly allowed. However, there is a commonly-used technique called JSONP that will allow you to avoid this restriction through the use of script tags. Basically, you create a callback function with a known name:
function receiveData(data) {
// ...
}
And then your server wraps JSON data in a function call, like this:
receiveData({"the": "data"});
And you "call" the cross-domain server by adding a script tag to your page. jQuery elegantly wraps all of this up in its ajax function.
Another technique that I've had to use at times is cross-document communication through iframes. You can have one window talk to another, even cross-domain, in a restricted manner through postMessage. Note that only recent browsers have this functionality, so that option is not viable in all cases without resorting to hackery.
You're going to need to have your response sent back to your client via a JSONP call.
What you'll need to do is to have your request for data wrapped in a script tag. Your server will respond with your data wrapped in a function call. By downloading the script as an external resource, your browser will execute the script (just like adding a reference to an external JS file like jQuery) and pass the data to a known JS method. Your JS method will then take the data and do whatever you need to do with it.
Lots of steps involved. Using a library like jQuery provides a lot of support for this.
Hope this helps.
I have website that use XMLHttpRequest (jQuery, actually). I also have another site running on the same server, which serves a script file that makes XHR requests back to THAT site, ie.
http://mysite:50000/index.html includes
<script src="http://mysite:9000/otherscript.js"></script>
and http://mysite:9000/otherscript.js includes
$.ajax({
url: 'http://mysite:9000/ajax/stuff'
});
The problem is - this doesn't work. The AJAX requests from the loaded script simply fail with no error message. From what I've been able to find this is the old same origin policy. Given that I control both sites, is there anything I can do to make this work? The "document.domain" trick doesn't seem to do a thing for XMLHttpRequest.
Nope- can't do this with XHR. Same-domain policy is very restrictive there- same host, same port, same protocol. Sorry! You'll have to resort to other tricks (iframes, title manipulation, etc) to get it to work.
You can do this by adding Access-Control-Allow-Origin header.
If you are using PHP
header("Access-Control-Allow-Origin: http://example.com");
or in Node.js
response.writeHead(200, {'Access-Control-Allow-Origin':' http://example.com'});
This should do the trick for you. It always works for me.
I just solved a similar issue with a PHP service I'm currently playing around with (not sure how relevant a PHP solution is to this directly, but...) by making a single line proxy PHP page, SimpleProxy.php:
<?php
echo file_get_contents('http://localhost:4567');
?>
And in my XMLHttpRequest I use 'SimpleProxy.php' in place of 'http://localhost:4567', which effectively puts the request on the same domain as my .js code.
I need to crawl a web board, which uses ajax for dynamic update/hide/show of comments without reloading the corresponding post.
I am blocked by this comment area.
In Ajax.request, url is specified with a path without host name like this :
new Ajax(**'/bbs/comment_db/load.php'**, {
update : $('comment_result'),
evalScripts : true,
method : 'post',
data : 'id=work_gallery&no=i7dg&sno='+npage+'&spl='+splno+'&mno='+cmx+'&ksearch='+$('ksearch').value,
onComplete : function() {
$('cmt_spinner').setStyle('display','none');
try {
$('cpn'+npage).setStyle('fontWeight','bold');
$('cpf'+npage).setStyle('fontWeight','bold');
} catch(err) {}
}
}).request();
If I try to access the url with the full host name then
I just got the message: "Permission Error" :
new Ajax(**'http://host.name.com/bbs/comment_db/load.php'**, {
update : $('comment_result'),
evalScripts : true,
method : 'post',
data : 'id=work_gallery&no=i7dg&sno='+npage+'&spl='+splno+'&mno='+cmx+'&ksearch='+$('ksearch').value,
onComplete : function() {
$('cmt_spinner').setStyle('display','none');
try {
$('cpn'+npage).setStyle('fontWeight','bold');
$('cpf'+npage).setStyle('fontWeight','bold');
} catch(err) {}
}
}).request();
will result in the same error.
This is the same even when I call the actual php url in the web browser like this:
http://host.name.com/bbs/comment_db/load.php?'id=work_gallery&..'
I guess that the php module is restricted to be called by an url in the same host.
Any idea for crawling this data ?
Thanks in advance.
-- Shin
Cross site XMLHttpRequest are forbidden by most browsers. If you want to crawl different sites, you will need to do it in a server side script.
As mentioned by darin, the XMLHttpRequest Object (which is the essence of Ajax requests) has security restrictions on calling cross-site HTTP requests, I believe its called the "Same Origin Policy for JavaScript".
While there is a working group within the W3C who have proposed new Access Control for Cross-Site Requests recommendation the restriction still remains in effect for most mainstream browsers.
I found some information on the Mozilla Developer Network that may provide a better explanation.
In your case, it appears that you are using the Prototype JavaScript framework, where Ajax.Request still uses the XMLHttpRequest object for its Ajax requests.
method:'post'
might well be your problem: the host serving the request likely rejects get requests, which is all you can throw at it from a browser address bar. if this is what's happening, you'll need to find or install some sort of scripting tool capable of doing the job (perl would be my choice, and unless you're running Windows, you'll already have that).
I do have to wonder whether what you're trying to do is legit, though: trawling other sites' comment databases isn't usually encouraged.
I would solve this by running a PHP script locally that will do the crawling from outside pages. That way jQuery doesn't have to go to an outside domain.