SponsorBlock/background.js

chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
	chrome.tabs.sendMessage(tabId, {
		message: 'update',
	});
});

chrome.runtime.onMessage.addListener(function (request, sender, callback) {
  if (request.message == "submitTimes") {
    submitTimes(request.videoID, callback);

    //this allows the callback to be called later by the submitTimes function
    return true;
  } else if (request.message == "addSponsorTime") {
    addSponsorTime(request.time, request.videoID, callback);

    //this allows the callback to be called later
    return true;
  } else if (request.message == "getSponsorTimes") {
    getSponsorTimes(request.videoID, function(sponsorTimes) {
      callback({
        sponsorTimes: sponsorTimes
      })
    });

    //this allows the callback to be called later
    return true;
  } else if (request.message == "submitVote") {
    submitVote(request.type, request.UUID, callback);

    //this allows the callback to be called later
    return true;
  } else if (request.message == "alertPrevious") {
	  chrome.notifications.create("stillThere" + Math.random(), {
		  type: "basic",
		  title: chrome.i18n.getMessage("wantToSubmit") + request.previousVideoID + "?",
		  message: chrome.i18n.getMessage("leftTimes"),
		  iconUrl: "./icons/LogoSponsorBlocker256px.png"
	  });
  }	
});

//add help page on install
chrome.runtime.onInstalled.addListener(function (object) {
  // TODO (shownInstallPage): remove shownInstallPage logic after sufficient amount of time,
  // so that people have time to upgrade and move to shownInstallPage-free code.
  chrome.storage.sync.get(["userID", "shownInstallPage"], function(result) {
    const userID = result.userID;
    // TODO (shownInstallPage): delete row below
    const shownInstallPage = result.shownInstallPage;

    // If there is no userID, then it is the first install.
    if (!userID){
      // Show install page, if there is no user id
      // and there is no shownInstallPage.
      // TODO (shownInstallPage): remove this if statement, but leave contents
      if (!shownInstallPage){
        //open up the install page
	      
        chrome.tabs.create({url: chrome.extension.getURL("/help/"+chrome.i18n.getMessage("helpPage")});
      }

      // TODO (shownInstallPage): delete if statement and contents
      // If shownInstallPage is set, remove it.
      if (!!shownInstallPage){
        chrome.storage.sync.remove("shownInstallPage");
      }

      //generate a userID
      const newUserID = generateUUID();
      //save this UUID
      chrome.storage.sync.set({
        "userID": newUserID,
        //the last video id loaded, to make sure it is a video id change
        "sponsorVideoID": null,
        "previousVideoID": null
      });
    }
  });
});

//gets the sponsor times from memory
function getSponsorTimes(videoID, callback) {
  let sponsorTimes = [];
  let sponsorTimeKey = "sponsorTimes" + videoID;
  chrome.storage.sync.get([sponsorTimeKey], function(result) {
    let sponsorTimesStorage = result[sponsorTimeKey];
    if (sponsorTimesStorage != undefined && sponsorTimesStorage.length > 0) {
      sponsorTimes = sponsorTimesStorage;
    }

    callback(sponsorTimes)
  });
}

function addSponsorTime(time, videoID, callback) {
  getSponsorTimes(videoID, function(sponsorTimes) {
    //add to sponsorTimes
    if (sponsorTimes.length > 0 && sponsorTimes[sponsorTimes.length - 1].length < 2) {
      //it is an end time
      sponsorTimes[sponsorTimes.length - 1][1] = time;
    } else {
      //it is a start time
      let sponsorTimesIndex = sponsorTimes.length;
      sponsorTimes[sponsorTimesIndex] = [];

      sponsorTimes[sponsorTimesIndex][0] = time;
    }

    //save this info
    let sponsorTimeKey = "sponsorTimes" + videoID;
    chrome.storage.sync.set({[sponsorTimeKey]: sponsorTimes}, callback);
  });
}

function submitVote(type, UUID, callback) {
  chrome.storage.sync.get(["userID"], function(result) {
    let userID = result.userID;

    //publish this vote
    sendRequestToServer("GET", "/api/voteOnSponsorTime?UUID=" + UUID + "&userID=" + userID + "&type=" + type, function(xmlhttp, error) {
      if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
        callback({
          successType: 1
        });
      } else if (xmlhttp.readyState == 4 && xmlhttp.status == 405) {
        //duplicate vote
        callback({
          successType: 0,
          statusCode: xmlhttp.status
        });
      } else if (error) {
        //error while connect
        callback({
          successType: -1,
          statusCode: xmlhttp.status
        });
      }
    })
  })
}

function submitTimes(videoID, callback) {
  //get the video times from storage
  let sponsorTimeKey = 'sponsorTimes' + videoID;
  chrome.storage.sync.get([sponsorTimeKey, "userID"], function(result) {
    let sponsorTimes = result[sponsorTimeKey];
    let userID = result.userID;

    if (sponsorTimes != undefined && sponsorTimes.length > 0) {
      //submit these times
      for (let i = 0; i < sponsorTimes.length; i++) {
          //submit the sponsorTime
          sendRequestToServer("GET", "/api/postVideoSponsorTimes?videoID=" + videoID + "&startTime=" + sponsorTimes[i][0] + "&endTime=" + sponsorTimes[i][1]
          + "&userID=" + userID, function(xmlhttp, error) {
            if (xmlhttp.readyState == 4 && !error) {
              callback({
                statusCode: xmlhttp.status
              });

              if (xmlhttp.status == 200) {
                //add these to the storage log
                chrome.storage.sync.get(["sponsorTimesContributed"], function(result) {
                  let currentContributionAmount = 0;
                  if (result.sponsorTimesContributed != undefined) {
                    //current contribution amount is known
                    currentContributionAmount = result.sponsorTimesContributed;
                  }

                  //save the amount contributed
                  chrome.storage.sync.set({"sponsorTimesContributed": currentContributionAmount + sponsorTimes.length});
                });
              }
            } else if (error) {
              callback({
                statusCode: -1
              });
            }
        });
      }
    }
  });
}

function sendRequestToServer(type, address, callback) {
  let xmlhttp = new XMLHttpRequest();

  xmlhttp.open(type, serverAddress + address, true);

  if (callback != undefined) {
    xmlhttp.onreadystatechange = function () {
      callback(xmlhttp, false);
    };
  
    xmlhttp.onerror = function(ev) {
      callback(xmlhttp, true);
    };
  }

  //submit this request
  xmlhttp.send();
}

function generateUUID(length = 36) {
    let charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    let result = "";
    let isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
    if (window.crypto && window.crypto.getRandomValues) {
        values = new Uint32Array(length);
        window.crypto.getRandomValues(values);
        for (i = 0; i < length; i++) {
            result += charset[values[i] % charset.length];
        }
        return result;
    } else {
        for (let i = 0; i < length; i++) {
          result += charset[Math.floor(Math.random() * charset.length)];
        }
        return result;
    }
}