{% extends 'base.html' %}

{% block content %}
<script>
    function form_validate(form) {
        console.log(form);
        let msg = "<ul>";
            
        // check wireguard pubkey
        let wg_key = document.getElementById("peer-wgkey").value;
        if (wg_key.length != 44 || wg_key.slice(-1) != "="){
            msg += "<li>invalid Wireguard key</li>";            
        }
        try {
            window.atob(wg_key)
        } catch (error) {
            msg += "<li>invalid Wireguard key</li>";            
        }
            
        // check endpoint
        let endpoint_enabled = document.getElementById("peer-endpoint-enabled").checked;
        let endpoint = document.getElementById("peer-endpoint").value;
        if (endpoint_enabled) {
            if (! endpoint) {
                msg += "<li>endpoint enabled but non specified</li>";
            } else if (isNaN(endpoint.split(":").at(-1))) {
                msg += "<li>endpoint doesn't end with a (port)number</li>";
            } else if (endpoint.split(":").length < 2 && endpoint.indexOf(".") == -1) {
                msg += "<li>endpoint doesn't look like a ip address or fqdn</li>";
            }
        }
        
        // check ip addresses
        let ipv6ll_enabled = document.getElementById("peer-v6ll-enabled").checked;
        let ipv4_enabled = document.getElementById("peer-v4-enabled").checked;
        let ipv6_enabled = document.getElementById("peer-v6-enabled").checked;

        let ipv6ll = document.getElementById("peer-v6ll").value;
        let ipv4 = document.getElementById("peer-v4").value;
        let ipv6 = document.getElementById("peer-v6").value;

        if (!(ipv6ll_enabled || ipv4_enabled || ipv6_enabled)) {
            msg += "<li>at least one ip type has to be enabled and specified</li>";
        }

        if (ipv6ll_enabled) {
            if (! ipv6ll) {
                msg += "<li>ipv6 LinkLocal enabled but non specified</li>";
            } else if (!ipv6ll.startsWith("fe80::")) {
                msg += "<li>ipv6 LinkLocal is no valid LinkLocal address</li>";
            }
        }
        if (ipv4_enabled) {
            if (! ipv4) {
                msg += "<li>ipv4 enabled but non specified</li>";
            } else if (!(ipv4.startsWith("172.2") || ipv4.startsWith("10.") || ipv4.startsWith("169.254")) ) {
                msg += "<li>ipv4 is no valid dn42/neo/icvpn/LinkLocal address</li>";
            }
        }
        if (ipv6_enabled) {
            if (! ipv6) {
                msg += "<li>ipv6 enabled but non specified</li>";
            } else if (!ipv6.startsWith("fd")) {
                msg += "<li>ipv6 is no valid fd00::/8 address</li>";
            }
        }
        
        // check BGP cap
        bgp_mp = document.getElementById("bgp-multi-protocol").checked;
        bgp_enh = document.getElementById("bgp-extended-next-hop").checked;
        if (! bgp_mp) {
            if ( ! (ipv4_enabled && (ipv6_enabled||ipv6ll_enabled))) {
                msg += "<li>both a ipv4 and ipv6 address must be spedified when not having MulitiProtocol</li>"
            }
            if (bgp_enh) {
                msg += "<li>extended next hop is not supported without MultiProtocol</li>"
            }
        }

        // if an error occured (= there is a msg) show that msg
        if (msg != "<ul>") {
            document.getElementById("peer-invalid-note").innerHTML = msg+"</ul>";
            return false;
        }
        return true
    }
    
    // update exaple config when changing values
    function update_from_endpoint() {
        let example_config_peer_port = document.getElementById("example-config-peer-port");
        let endpoint_enabled = document.getElementById("peer-endpoint-enabled").checked;
        let endpoint = document.getElementById("peer-endpoint").value;
        if (endpoint_enabled && endpoint && endpoint.split(":").length >= 2) {
            example_config_peer_port.innerHTML = endpoint.split(":").at(-1);
            return
        }
        example_config_peer_port.innerHTML = '2{{config["ASN"][-4:]}}'
    }
    function update_from_v6ll() {
        let example_config_ip = document.getElementById("example-config-ipv6ll");
        let example_config_peer_ip = document.getElementById("example-config-peer-ipv6ll");
        let ip_enabled = document.getElementById("peer-v6ll-enabled").checked;
        let ip = document.getElementById("peer-v6ll").value;
        if (ip_enabled) {
            example_config_ip.style.display = "";
            example_config_peer_ip.innerHTML = ip;
        } else {
            example_config_ip.style.display = "none";
        }
    }
    function update_from_v4() {
        let example_config_ip = document.getElementById("example-config-ipv4");
        let example_config_peer_ip = document.getElementById("example-config-peer-ipv4");
        let ip_enabled = document.getElementById("peer-v4-enabled").checked;
        let ip = document.getElementById("peer-v4").value;
        if (ip_enabled) {
            example_config_ip.style.display = "";
            example_config_peer_ip.innerHTML = ip;
        } else {
            example_config_ip.style.display = "none";
        }
    }
    function update_from_v6() {
        let example_config_ip = document.getElementById("example-config-ipv6");
        let example_config_peer_ip = document.getElementById("example-config-peer-ipv6");
        let ip_enabled = document.getElementById("peer-v6-enabled").checked;
        let ip = document.getElementById("peer-v6").value;
        if (ip_enabled) {
            example_config_ip.style.display = "";
            example_config_peer_ip.innerHTML = ip;
        } else {
            example_config_ip.style.display = "none";
        }
    }
    function update_from_mpbgp() {
        let example_config_bird1 = document.getElementById("example-config-bird1");
        let example_config_bird2 = document.getElementById("example-config-bird2");
        let mpbgp_enabled = document.getElementById("bgp-multi-protocol").checked;
        let extended_next_hop = document.getElementById("bgp-extended-next-hop");
        if (mpbgp_enabled) {
            example_config_bird1.style.display = "none";
            example_config_bird2.style.display = "";
            extended_next_hop.disabled = false;
        } else {
            example_config_bird1.style.display = "";
            example_config_bird2.style.display = "none";
            extended_next_hop.checked = false;
            extended_next_hop.disabled = true;
            
        }
    }
    function update_from_enh() {
        let example_config_bird2_enh4 = document.getElementById("example-config-bird2-enh4");
        let example_config_bird2_enh6 = document.getElementById("example-config-bird2-enh6");
        let enh_anabled = document.getElementById("bgp-extended-next-hop").checked;
        if (enh_anabled) {
            example_config_bird2_enh4.innerHTML = "on";
            example_config_bird2_enh6.innerHTML = "on";
        } else {
            example_config_bird2_enh4.innerHTML = "off";
            example_config_bird2_enh6.innerHTML = "off";
        }
    }

    function on_load() {
        update_from_v6ll();
        update_from_v4();
        update_from_v6();
        update_from_mpbgp();
        update_from_enh();
    }
    document.onload = on_load;
</script>

<div>
    {% for peering in mnt_peerings %}
    <a href="?node={{peering['node']}}&asn={{session['user-data']['asn']}}">
        <button {% if selected_peering %}{% if selected_peering == peering['node'] %}class="button-selected"{% endif %}{% endif %}>
            with<br>{{peering["node"]}}
        </button>
        {% if selected_node == peering['node'] %}
            {% set selected_peering = peering %}
        {% endif %}
    </a>
    {% endfor %}
</div>
<form action="" method="post" class="flex" onsubmit="return form_validate(this)">
    <div id="peer-invalid-note" style="background-color:red;">{% if msg %}{{msg}}{%endif%}</div>
    <table>
        <tr>
            <td><label for="peer-asn">Your ASN</label></td>
            <td></td>
            <td><input type="text" name="peer-asn" id="peer-asn" disabled="disabled" value="{{session['user-data']['asn']}}"></td>
        </tr>
        <tr>
            <td><h4>Wireguard</h4></td>
            <td></td>
            <td></td>
        </tr>
        <tr>
            <td><label for="peer-wgkey">your Wireguard Publickey</label></td>
            <td></td>
            <td><input type="text" name="peer-wgkey" id="peer-wgkey" maxlength="44" minlength="44" required {% if selected_peering %}value="{{selected_peering['wg_key']}}"{%endif%}></td>
        </tr>
        <tr>
            <td><label for="peer-endpoint">your Endpoint</label></td>
            <td><input type="checkbox" name="peer-endpoint-enabled" id="peer-endpoint-enabled" {% if selected_peering %}{% if selected_peering["endpoint"] %} checked {% endif %}{%endif%}></td>
            <td><input type="text" name="peer-endpoint" id="peer-endpoint" onchange="return update_from_endpoint()" placeholder="node.example.org:1234" {% if selected_peering %}{% if selected_peering["endpoint"] %}value="{{selected_peering['endpoint']}}"{% endif %}{%endif%}></td>
        </tr>
        <tr>
            <td><label for="peer-v6ll">your ipv6 LinkLocal</label></td>
            <td><input type="checkbox" name="peer-v6ll-enabled" id="peer-v6ll-enabled" onchange="return update_from_v6ll()" placeholder="fe80::xxxx (recommended/preferred)" title="default when using extended next hop" {% if selected_peering %}{% if selected_peering["ipv6ll"] %} checked {% endif %}{%endif%}></td>
            <td><input type="text" name="peer-v6ll" id="peer-v6ll" onchange="return update_from_v6ll()"{% if selected_peering %}{% if selected_peering["ipv6ll"] %}value="{{selected_peering['ipv6ll']}}" {% endif %}{%endif%}></td>
        </tr>
        <tr>
            <td><label for="peer-v4">your ipv4</label></td>
            <td><input type="checkbox" name="peer-v4-enabled" id="peer-v4-enabled" onchange="return update_from_v4()" {% if selected_peering %}{% if selected_peering["ipv4"] %} checked {% endif %}{%endif%}></td>
            <td><input type="text" name="peer-v4" id="peer-v4" onchange="return update_from_v4()" placeholder="172.2x.yyy.zzz" title="only required when not using extended next hop or not MultiProtocol" {% if selected_peering %}{% if selected_peering["ipv4"] %}value="{{selected_peering['ipv4']}}" {% endif %}{%endif%}></td>
        </tr>
        <tr>
            <td><label for="peer-v6">your ipv6</label></td>
            <td><input type="checkbox" name="peer-v6-enabled" id="peer-v6-enabled" onchange="return update_from_v6()"{% if selected_peering %}{% if selected_peering["ipv6"] %} checked {% endif %}{%endif%}></td>
            <td><input type="text" name="peer-v6" id="peer-v6" onchange="return update_from_v6()" placeholder="fdxx:yyyy:zzzz:..." title="only required when ipv6 LinkLocal and/or MultiProtocol BGP are not supported" {% if selected_peering %}{% if selected_peering["ipv6"] %}value="{{selected_peering['ipv6']}}" {% endif %}{%endif%}></td>
        </tr>
        <tr>
            <td><h4>BGP</h4></td>
            <td></td>
            <td></td>
        </tr>
        <tr>
            <td><label for="bgp-multi-protocol">MultiProtocol</label></td>
            <td><input type="checkbox" name="bgp-multi-protocol" id="bgp-multi-protocol" onchange="return update_from_mpbgp()" {% if selected_peering %}{% if selected_peering["bgp_mp"] == True %} checked {% endif %}{%endif%}></td>
            <td></td>
        </tr>
        <tr>
            <td><label for="bgp-extended-next-hop">extended next hop</label></td>
            <td><input type="checkbox" name="bgp-extended-next-hop" id="bgp-extended-next-hop" onchange="return update_from_enh()" {% if selected_peering %}{% if selected_peering["bgp_enh"] == True%} checked {% endif %}{%endif%}></td>
            <td></td>
        </tr>
    </table>

    <input type="submit" value="submit">
</form>
<div class="example-config">
    <noscript>this example config requires Javascript to work</noscript>
    <p>wg-quick:</p>
    <pre id="node-wireguard">
[Interface] <br>
PrivateKey = &ltyour private key&gt
ListenPort = <span id="example-config-peer-port">2{{config["ASN"][-4:]}}</span>
<span id="example-config-ipv4">PostUp = ip address add dev %i <span id="example-config-peer-ipv4">...</span>/32 peer <span id="example-config-node-ipv4">{% if selected_node %}{{config["nodes"][selected_node]["internal-v4"]}} {% else %} ... {% endif %}</span><br></span><span id="example-config-ipv6">PostUp = ip address add dev %i <span id="example-config-peer-ipv6">...</span>/128 peer <span id="example-config-node-ipv6">{% if selected_node %}{{config["nodes"][selected_node]["internal-v6"]}} {% else %} ... {% endif %}</span><br></span><span id="example-config-ipv6ll">PostUp = ip address add dev %i <span id="example-config-peer-ipv6ll">...</span>/128 peer <span id="example-config-node-ipv6ll">{% if selected_node %}{{config["nodes"][selected_node]["internal-v6ll"]}} {% else %} ... {% endif %}</span></span>
Table = off

[Peer]
PublicKey = <span id="exmple-config-node-pubkey">{% if selected_node %}{{config["nodes"][selected_node]["wg-key"]}}{% else %} ... {% endif %}</span>
Endpoint = <span id="exmple-config-node-endpoint">{% if selected_node %}{{config["nodes"][selected_node]["endpoint"]}}{% else %} ... {% endif %}</span>:<span id="example-config-node-port">{% if session["user-data"]["asn"].startswith("424242") %}2{{session["user-data"]["asn"][-4:]}}{% else %} ... {% endif %}</span>
AllowedIPs = <span id="example-config-node-v6ll">{% if selected_node %}{{config["nodes"][selected_node]["internal-v6ll"]}} {% else %} ... {% endif %}</span>,172.20.0.0/14,172.31.0.0/16,10.0.0.0/8,fd00::/8
    </pre>
    
    <p>bird config:</p>
    <pre id="example-config-bird2">
protocol bgp dn42_{{config["MNT"][:-4].lower()}} from dnpeers {
    neighbor {% if selected_node %}{{config["nodes"][selected_node]["internal-v6ll"]}} {% else %} ... {% endif %} as {{config["ASN"]}};
    interface "dn42_{{config["MNT"][:-4].lower()}}";
    ipv4 {
        extended next hop <span id="example-config-bird2-enh4">on</span>;
    };
    ipv6 {
        extended next hop <span id="example-config-bird2-enh6">on</span>;
    };
}
    </pre>

    <pre id="example-config-bird1">
protocol bgp dn42_{{config["MNT"][:-4].lower()}}_v4 from dnpeers {
    neighbor {% if selected_node %}{{config["nodes"][selected_node]["internal-v4"]}} {% else %} ... {% endif %} as {{config["ASN"]}};
    interface "dn42_{{config["MNT"][:-4].lower()}}";
    ipv4 {
        
    };
protocol bgp dn42_{{config["MNT"][:-4].lower()}}_v6 from dnpeers {
    <span id="example-bird1-v6ll">neighbor {% if selected_node %}{{config["nodes"][selected_node]["internal-v6ll"]}} {% else %} ... {% endif %} as {{config["ASN"]}};</span> 
    <span id="example-bird1-v6">neighbor {% if selected_node %}{{config["nodes"][selected_node]["internal-v6"]}} {% else %} ... {% endif %} as {{config["ASN"]}};</span>
    interface "dn42_{{config["MNT"][:-4].lower()}}";
    ipv6 {
        
    };
}
        </pre>
    </div>
</div>
<script>
    document.onload();
</script>

{% endblock %}