JavaDowngrader/web/public/index.html at 33694448c21e37e4ad120b2c6c664d4870bcd7d1 · RaphiMC/JavaDowngrader · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>JavaDowngrader example</title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    <script src="https://cjrtnc.leaningtech.com/3.0/cj3loader.js"></script>
</head>
<body>
<form style="display: none" id="downgrader-form">
    <label for="file">File:</label>
    <input type="file" id="file" name="file" accept=".jar">
    <label for="version-select">Target version:</label>
    <select id="version-select">
    </select>
    <input type="button" value="Downgrade" onclick="downgrade()">
</form>
<p id="loading">
    Loading...
</p>
<script>
    (async function () {
        await cheerpjInit();
        const cj = await cheerpjRunLibrary("/app/JavaDowngrader-Web-1.1.2-SNAPSHOT.jar");
        window.javadowngrader = await cj.net.raphimc.javadowngrader.web.JavaDowngraderWeb

        console.log("Creating form")
        const versions = await window.javadowngrader.supportedVersions();
        const select = document.getElementById("version-select");
        for (let i = 0; i < versions.length; i++) {
            const version = versions[i];
            const option = document.createElement("option");
            option.value = version;
            option.text = version;
            select.appendChild(option);
        }

        document.getElementById("downgrader-form").style.display = "block";
        document.getElementById("loading").style.display = "none";

        console.log("Form created")
    })()

    async function downgrade() {
        const file = document.getElementById("file").files[0];
        const version = document.getElementById("version-select").value;

        const reader = new FileReader();
        reader.onload = async function (e) {
            const file = e.target.result;
            const base64Data = bytesToBase64(new Uint8Array(file));
            const downgraded = await window.javadowngrader.convert(base64Data, 20, version);

            const blob = new Blob([base64ToBytes(downgraded)], {type: "application/java-archive"});
            const url = URL.createObjectURL(blob);
            const a = document.createElement("a");
            a.href = url;
            a.download = file.name;
            a.click();
        };
        reader.readAsDataURL(file);
    }

    function base64ToBytes(base64) {
        const binString = atob(base64);
        return Uint8Array.from(binString, (m) => m.codePointAt(0));
    }

    function bytesToBase64(bytes) {
        const binString = String.fromCodePoint(...bytes);
        return btoa(binString);
    }
</script>
</body>
</html>