grass_touching_captcha/templates/register.jinja2

{% extends "base.jinja2" %}
{% block title %}Grass Touching Register{% endblock %}
{% block body %}

<div class="d-flex justify-content-center align-items-center" style="height: 75vh;">
    <div class="bg-white rounded rounded-5 border border-5 border-white p-4">
        <form action="/register" method="post">
            <h2>Register</h2>
            <div class="form-group" style="margin-top: 4%;">
                <label for="usernameinput">Username</label>
                <input name="username" class="form-control" id="usernameinput" placeholder="Enter username">
            </div>

            <div class="form-group" style="margin-top: 4%;">
                <label for="passwordinput">Password</label>
                <input type="password" name="password" class="form-control" id="passwordinput" placeholder="Enter password">
            </div>

            <div class="form-group" style="margin-top: 4%;">
                <div hidden id="grass-touching-form" class="mb-3">
                    <label class="form-label" for="file_input">Grass touching proof</label>
                    <div id="challengehelp">To complete this challenge, you need to submit a picture of you touching grass next to a paper containing the following text: Loading...</div>
                    <input accept="image/png, image/jpeg" name="file" type="file" class="form-control" id="file_input">
                </div>

                <small id="proofhelp" class="form-text text-muted">Dont worry! We wont tell your friends.</small>
            </div>
            <button id="submit" type="button" class="btn btn-primary mx-auto d-block" style="width: 100%; margin-top: 4%;">Submit</button>
        </form>
    </div>
</div>

<script type="text/javascript">
function upload_success(image_url) {
    document.getElementById("submit").disabled = false;
    document.getElementById("submit").innerHTML = "Submit"
    document.getElementById("submit").type = "submit"

    document.getElementById("grass-touching-form").innerHTML += `<img class="preview-img" src="${image_url}">`;
}

function upload_error(error_message) {
    console.error(error_message)

    file_input = document.getElementById("file_input");
    file_input.value = ''

    document.getElementById("submit").innerHTML = "Submit"
    document.getElementById("submit").disabled = false;
    document.getElementById("grass-touching-form").innerHTML += `<div class="text-danger">${error_message}</div>`;

}

function upload_file(file_type, file_content) {
    username_input = document.getElementById("usernameinput").value
    fetch('{{ url_for("submit_challenge") }}', {
            method: "POST",
            body: JSON.stringify({image_data: file_content, image_type: file_type, username: username_input}),
            headers: {
                "Content-type": "application/json"
            }
        }
    ).then(response => {
        if (response.status == 401 || response.status == 400) {
            response.text().then(text => {
                    if (text) {
                        upload_error(text);

                    }
                }
            )
            return;
        }

        return response.text();
    })
    .then(image_url => {
        if (image_url) {
            upload_success(image_url);
        }
    })
    .catch((error) => {
        console.error("Error:", error);
    });
}

function read_file () {
    file_input = document.getElementById("file_input");
    var filereader = new FileReader();

    filereader.onload = function () {
        document.getElementById("submit").innerHTML = '<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span><span class="visually-hidden">Loading...</span>';
        document.getElementById("submit").disabled = true;
        
        const file = file_input.files[0];
        let file_type;

        if (file.type.match("image/jpeg")) {
            file_type = "jpeg";
        }
        else if (file.type.match("image/png")) {
            file_type = "png";
        }
        else {
            document.getElementById("grass-touching-form").textContent += `<div class="text-danger">Only JPEG and PNG is supported.</div>`;
            return;
        }

        upload_file(file_type, filereader.result);
    };

    filereader.readAsDataURL(file_input.files[0]);
}


function get_challenge() {
    username_input = document.getElementById("usernameinput")
    fetch('{{ url_for("generate_challenge_route") }}', {
        method: "POST",
        body: JSON.stringify({username: username_input.value}),
        headers: {
            "Content-type": "application/json"
        }
    }).then(response => {
        response.text().then(challenge_text => {
            if (challenge_text) {
                document.getElementById("challengehelp").innerHTML = `To complete this challenge, you need to submit a picture of you touching grass next to a paper containing the following text: ${challenge_text}`
            }
        })

    })  
}

function submit () {
    username_input = document.getElementById("usernameinput")
    grass_touching_form = document.getElementById("grass-touching-form")

    if (grass_touching_form.hidden) {
        if (username_input.value) {
            grass_touching_form.hidden = false;
            get_challenge();
        }
    }
    else {
        read_file();
    }
}

submit_button = document.getElementById("submit")
submit_button.addEventListener("click", submit)

</script>

{% endblock %}