init.php

<?php
class Fever extends Plugin {
    private $host;

    function about() {
        return array(2.3,
            "Emulates the Fever API for Tiny Tiny RSS",
            "DigitalDJ, mestrode & murphy, eric-pierce");
    }

    function init($host) {
        $this->host = $host;
        
        $host->add_hook($host::HOOK_PREFS_TAB, $this);
    }
    
    /* plugins/main/init.php hook_prefs_tab */

    function hook_prefs_tab($args) {
        if ($args != "prefPrefs") return;

        print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"" . __("Fever Emulation") . "\">";

        print "<h3>" . __("Fever Emulation") . "</h3>";

        print "<p>" . __("Since the Fever API uses a different authentication mechanism to Tiny Tiny RSS, you must set a separate password to login. This password may be the same as your Tiny Tiny RSS password.") . "</p>";

        print "<p>" . __("Set a password to login with Fever:") . "</p>";
        
        print "<p><b>" . __("WARNING: The Fever API uses an UNSECURE unsalted MD5 hash. Consider the use of a disposable application-specific password and use HTTPS.") . "</b></p>";

        print "<form dojoType=\"dijit.form.Form\">";

        print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
            evt.preventDefault();
            if (this.validate()) {
                xhrPost(\"backend.php\", this.getValues(), (transport) => {
                            Notify.info(transport.responseText);
                        })
            }
            </script>";
            
        print \Controls\hidden_tag("op", "pluginhandler");
        print \Controls\hidden_tag("method", "save");
        print \Controls\hidden_tag("plugin", "fever");

        print "<input dojoType=\"dijit.form.ValidationTextBox\" required=\"1\" type=\"password\" name=\"password\" />";
        print "<button dojoType=\"dijit.form.Button\" type=\"submit\">" . __("Set Password") . "</button>";
        print "</form>";

        print "<p>" . __("To login with the Fever API, set your server details in your favourite RSS application to: ") . get_self_url_prefix() . "/plugins.local/fever/" . "</p>";
        print "<p>" . __("Additional details can be found at ") . "<a href=\"http://www.feedafever.com/api\" target=\"_blank\">https://feedafever.com/api</a></p>";

        print "<p>" . __("Note: Due to the limitations of the API and some RSS clients (for example, Reeder on iOS), some features are unavailable: \"Special\" Feeds (Published / Tags / Labels / Fresh / Recent), Nested Categories (hierarchy is flattened)") . "</p>";

        print "</div>";
    }

    function save()
    {
        if (isset($_POST["password"]) && isset($_SESSION["uid"]))
        {
            $sth = $this->pdo->prepare("SELECT login FROM ttrss_users WHERE id = ?");
            $sth->execute([clean($_SESSION["uid"])]);
            if ($line = $sth->fetch())
            {
                $password = md5($line["login"] . ":" . $_POST["password"]);
                $this->host->set($this, "password", $password);
                echo __("Password saved.");
            }
        }
    }
    
    function api_version() {
        return 2;
    }
}

?>