<?
    // http://wiki.vg/Mojang_API

    $USERNAME = $_GET["username"];

    if (!isset($USERNAME))
        die("Username not set");

    $CACHED_SKIN = $_SERVER["DOCUMENT_ROOT"] . "/skincache/$USERNAME.png";

    // Get username UUID
    $curl = curl_init();
    curl_setopt_array($curl, array(
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_URL => "https://api.mojang.com/users/profiles/minecraft/$USERNAME",
        CURLOPT_USERAGENT => "Mine-imator",
        CURLOPT_CONNECTTIMEOUT => 10
    ));

    $response = curl_exec($curl);
    $response_parsed = json_decode($response);

    if (json_last_error() != JSON_ERROR_NONE)
        die("Could not find user");

    if (isset($response_parsed->{"error"}))
    {
        // Fetch from cache or throw error
        if ($response_parsed->{"error"} == "TooManyRequestsException" && file_exists($CACHED_SKIN))
        {
            header("Content-type: image/png");
            header("Content-Length: " . filesize($CACHED_SKIN));
            readfile($CACHED_SKIN);
            die("");
        }
        else
            die("UUID " . $response_parsed->{"error"} . ": " . $response_parsed->{"errorMessage"});
    }

    $uuid = $response_parsed->{"id"};

    // Get skin URL
    curl_setopt_array($curl, array(
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_URL => "https://sessionserver.mojang.com/session/minecraft/profile/" . $uuid,
        CURLOPT_USERAGENT => "Mine-imator",
        CURLOPT_CONNECTTIMEOUT => 10
    ));

    $response = curl_exec($curl);
    $response_parsed = json_decode($response);

    if (json_last_error() != JSON_ERROR_NONE)
        die("Could not find profile");

    if (isset($response_parsed->{"error"}))
    {
        // Fetch from cache or throw error
        if ($response_parsed->{"error"} == "TooManyRequestsException" && file_exists($CACHED_SKIN))
        {
            header("Content-type: image/png");
            header("Content-Length: " . filesize($CACHED_SKIN));
            readfile($CACHED_SKIN);
            die("");
        }
        else
            die("Profile " . $response_parsed->{"error"} . ": " . $response_parsed->{"errorMessage"});
    }

    $textures_data = $response_parsed->{"properties"}[0]->{"value"};
    $textures_parsed = json_decode(base64_decode($textures_data));

    if (json_last_error() != JSON_ERROR_NONE)
        die("Could not find texture data");

    $skin_url = $textures_parsed->{"textures"}->{"SKIN"}->{"url"};

    // Get skin image
    curl_setopt_array($curl, array(
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_URL => $skin_url,
        CURLOPT_USERAGENT => "Mine-imator",
        CURLOPT_CONNECTTIMEOUT => 10
    ));

    $data = curl_exec($curl);
    curl_close($curl);

    // Store in cache
    file_put_contents($CACHED_SKIN, $data);

    // Output skin
    header("Content-type: image/png");
    echo $data;
?>