// ==UserScript==
// @name         reddit: sabotage event tracker
// @namespace    mz1js5x0yt0zxq1kf22z1wdn6zq2ij2g
// @version      1.2
// @description  Blocks the reddit event collector
// @match        *://*.reddit.com/*
// @match        *://reddit.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==
(function(){
  "use strict";
  var script = function() {
    "use strict";

    var realSetRequestHeader = XMLHttpRequest.prototype.setRequestHeader;
    var realSend             = XMLHttpRequest.prototype.send;

    var defineProp = Reflect.defineProperty.bind(Reflect);

    var sigHeaderDetected = Symbol();


    // Hook this function to see if the suspect header is being set
    XMLHttpRequest.prototype.setRequestHeader = function setRequestHeader(header, value) {
      // If not already tagged, check the header.
      if (!(sigHeaderDetected in this)) {
        var foundHeader = false;
        header = String(header).toLowerCase();

        if (header.startsWith("x-signature")) {
          foundHeader = true;
        } else if (window.r && r.config) {
          if ((r.config.signature_header    && String(r.config.signature_header).toLowerCase()    === header) ||
            (r.config.signature_header_v2 && String(r.config.signature_header_v2).toLowerCase() === header)
          ) {
            foundHeader = true;
          }
        }

        // Tag this object so we can block the send() call later
        if (foundHeader) {
          defineProp(this, sigHeaderDetected, {
            enumerable: false,
            configurable: false,
            writable: false,
            value: true
          });
        }
      }

      return realSetRequestHeader.apply(this, arguments);
    };


    // Only allow sending if we did not detect the signature header
    XMLHttpRequest.prototype.send = function send(body) {
      if (sigHeaderDetected in this) {
        // nope
        this.abort();
      } else {
        return realSend.apply(this, arguments);
      }
    };
  };

  function injectAndRunFunction(functionRef) {
    var scr = document.createElement('script');
    scr.type="text/javascript";
    scr.innerHTML='(' + functionRef.toString() + ')();';
    document.getElementsByTagName('head')[0].appendChild(scr);
  }

    injectAndRunFunction(script);
})();