How to register Yahoo Mail `mailto` protocol handler in Chrome?

Question

How to register Yahoo Mail `mailto` protocol handler in Chrome?

143 views Asked by aetonsi At 23 November 2024 at 13:32

how can i register the mailto: protocol handler for the Yahoo Mail web client?

I know the javascript to run should be smt like this:

navigator.registerProtocolHandler('mailto', 'https://compose.mail.yahoo.com/?%s', 'Yahoo Mail');

The problem is, their email composition URL domain compose.mail.yahoo.com is not the same as their main one mail.yahoo.com, so running registerProtocolHandler in the mail.yahoo.com inspector console gives the error:

Uncaught DOMException: Failed to execute 'registerProtocolHandler' on 'Navigator': Can only register custom handler in the document's origin. at :1:11

... and you can't run it in a compose.mail.yahoo.com window because it immediately redirects away with an HTTP 302 to login.yahoo.com with an additional redirect (if you're logged in) to mail.yahoo.com/d/compose.

So i can register such an handler? I just need to find a way to execute that javascript in the context of compose.mail.yahoo.com, i think..

Original Q&A

There are 2 answers

**aetonsi** · Answer 1 · 2023-11-17 16:44:35

I found an answer by myself, even though it's kind of an hack.

log out of Yahoo! Mail
go to the login page https://login.yahoo.com
set the handler like this:

navigator.registerProtocolHandler('mailto', 'https://login.yahoo.com?.src=ym&pspid=159600001&activity=mail-direct&.lang=en-US&.intl=us&.done=https%3A%2F%2Fcompose.mail.yahoo.com%2F%3Fto%3d%s', 'Yahoo Mail');

That is a generic login link with a post-login redirect to the double-urlencoded URL present in the .done parameter, which translates to the compose.mail.yahoo.com link needed for yahoo mail.

Adjust the &.lang=en-US&.intl=us as needed to set your preferred language.

I don't know what the other parameters are for, exactly.

I got this URL by checking what/how compose.mail.yahoo.com redirects to via curl:

curl -L -i compose.mail.yahoo.com/[email protected]


HTTP/1.1 301 Redirect
Date: Fri, 17 Nov 2023 16:43:31 GMT
Connection: keep-alive
Server: ATS
Cache-Control: no-store
Location: https://compose.mail.yahoo.com/mrd/[email protected]
Content-Type: text/html
Content-Language: en
Content-Length: 332

HTTP/1.1 302 Found
referrer-policy: origin-when-cross-origin
strict-transport-security: max-age=31536000
x-frame-options: DENY
x-omg-env: norrin-green--istio-production-ir2-6cb7454cc6-qwvld
location: https://login.yahoo.com?.src=ym&pspid=159600001&activity=mail-direct&.lang=en-US&.intl=us&.done=https%3A%2F%2Fcompose.mail.yahoo.com%2Fmrd%2Fmrd%2F%3Fto%3Dxxx%40xxx.com
vary: Accept
content-type: text/plain; charset=utf-8
content-length: 190
content-security-policy: script-src 'nonce-2dnbUx4mJ1RLHE1i43f1n+ZxjDBRnYSyNMmne9TtZ3DoZu/S'
date: Fri, 17 Nov 2023 16:43:32 GMT
x-envoy-upstream-service-time: 13
server: ATS
Age: 0
Connection: keep-alive
Expect-CT: max-age=31536000, report-uri="http://csp.yahoo.com/beacon/csp?src=yahoocom-expect-ct-report-only"
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff

**aetonsi** · Answer 2 · 2023-11-17 20:48:51

Another possibility would be to setup a little redirect page on a website you possess, with a simple script like:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
</head>

<body>
    <script>
        const urlParams = new URLSearchParams(window.location.search)
        if (urlParams.has('s')) {
            // if parameter "s" present, create URL and navigate
            const s = urlParams.get('s')
            document.location.href = `https://compose.mail.yahoo.com/?to=${encodeURIComponent(s)}`
        } else {
            // else, allow the user to register the handler
            function register() {
                const newHandler = `https://${document.location.host + document.location.pathname}?s=%s`
                navigator.registerProtocolHandler('mailto', newHandler)
            }
        }
    </script>

    <button onclick="register()">register protocol handler for mailto: links</button>
    <a target="_blank"
        href="mailto:[email protected][email protected], [email protected], [email protected]&[email protected]&subject=Big%20News&body=Body+goes+here">Email
        test link</a>
</body>

</html>

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How to register Yahoo Mail `mailto` protocol handler in Chrome?

There are 2 answers

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