Using JavaScript in conjunction with IPFS to verify the 404 status from localhost:8080 and identify if the local IPFS node is active within a browser user script

Question

Using JavaScript in conjunction with IPFS to verify the 404 status from localhost:8080 and identify if the local IPFS node is active within a browser user script

As a newcomer to IPFS and JavaScript, I have successfully created a simple IPFS userscript that redirects addresses containing *://*/ipfs/* or *://*/ipns/* to

http://localhost:8080/<IPFS_HASH>

.

However, there is an issue when the local IPFS node is not running, causing the reroute to fail because nothing is happening on localhost:8080. My question is, is there a way for the userscript, which runs in my browser (Safari with Tampermonkey), to determine if localhost:8080 is reachable? If it is reachable, the script should initiate the redirect, but if not, it should do nothing.

When the local IPFS node is active, localhost:8080 returns a "404 page not found" error.

https://i.stack.imgur.com/mX5hA.png

On the other hand, when the node is inactive, Safari cannot reach anything at that address:

https://i.stack.imgur.com/r48Gs.png

The most straightforward solution may be to use JavaScript to mimic the command

curl -o /dev/null --silent --head --write-out "%{http_code}\n" localhost:8080

: if the response is "404", IPFS is active, and the script can proceed with the rerouting; but if it is "000", then IPFS is inactive, and the script should refrain from any action.

How can I implement this functionality in JavaScript? Any assistance would be greatly appreciated.

javascript browser userscripts tampermonkey ipfs

Answer 1

Answer №1

To interact with the server, you may utilize an XMLHttpRequest. Check out an example from this source.

var request = new XMLHttpRequest();

request.onreadystatechange = function () {
        if (request.readyState == 4) {
                // The request has been completed; can be successful or due to timeout
                alert(request.status);
        }
};

request.open("GET", "http://example.com/api/data", true);
request.timeout = 3000; // Set a timeout of 3 seconds (3000 milliseconds)
request.ontimeout = function () { alert("Request timed out!"); }
request.send("");

Answer 2

To interact with the server, you may utilize an XMLHttpRequest. Check out an example from this source.

var request = new XMLHttpRequest();

request.onreadystatechange = function () {
        if (request.readyState == 4) {
                // The request has been completed; can be successful or due to timeout
                alert(request.status);
        }
};

request.open("GET", "http://example.com/api/data", true);
request.timeout = 3000; // Set a timeout of 3 seconds (3000 milliseconds)
request.ontimeout = function () { alert("Request timed out!"); }
request.send("");

Using JavaScript in conjunction with IPFS to verify the 404 status from localhost:8080 and identify if the local IPFS node is active within a browser user script

Answer №1

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