extension-background.js

WebExtension = (typeof browser !== 'undefined') ? browser : chrome;

var C = {
  'tabIds': [],
  'WebID': null
};

function injectResources(tabId, files) {
  var getFileExtension = /(?:\.([^.]+))?$/;

  //helper function that returns appropriate chrome.tabs function to load resource
  var loadFunctionForExtension = (ext) => {
    switch(ext) {
      case 'js' : return WebExtension.tabs.executeScript;
      case 'css' : return WebExtension.tabs.insertCSS;
      default: throw new Error('Unsupported resource type')
    }
  };

  return Promise.all(files.map(resource => new Promise((resolve, reject) => {
    var ext = getFileExtension.exec(resource)[1];
    var loadFunction = loadFunctionForExtension(ext);

    // loadFunction(C.tabId, {file: resource}).then(() => {
    loadFunction(tabId, {file: resource}, () => {
      if (WebExtension.runtime.lastError) {
        reject(WebExtension.runtime.lastError);
      }
      else {
        resolve();
      }
    });
  })));
}

function dokieliInit(tab) {
// console.log(tab);

  injectResources(tab.id, ["media/css/dokieli.css"]).then(() => {
  }).catch(err => {
     // console.log('Error occurred: '+err);
  });
}

function showDocumentMenu(tab) {
  WebExtension.tabs.sendMessage(tab.id, {action: "dokieli.showDocumentMenu", webid: C.WebID}, function(r){
    if(C.tabIds.indexOf(tab.id) < 0) {
      C.tabIds.push(tab.id);
    }
  });
}

WebExtension.browserAction.onClicked.addListener(function(tab){
  if(typeof WebExtension.management.getAll !== 'undefined') {
    // WebExtension.management.getAll().then(function(extension){
    WebExtension.management.getAll(function(extension){
      var promises = [];

      for(var i =0; i < extension.length; i++) {
        if (extension[i].enabled && typeof extension[i].shortName !== 'undefined') {
          switch(extension[i].shortName) {
            case "opl_youid":
              promises.push(
                WebExtension.runtime.sendMessage(extension[i].id, {getWebId: true}, function(response) {
                  if (response) {
                    C.WebID = response.webid;

                    return Promise.resolve();
                  }
                })
              );
              break;
          }
        }
      }

      Promise.all(promises)
        .then(function(results) {
          // WebExtension.tabs.sendMessage(tab.id, {action: "dokieli.status"}).then(
          WebExtension.tabs.sendMessage(tab.id, {action: "dokieli.status"},
            function(response) {
              if (response && !response.dokieli) {
                dokieliInit(tab);
              }
              showDocumentMenu(tab);
            });
        });
    });
  }
});

WebExtension.runtime.onMessage.addListener(function(request, sender, sendResponse) {
  if (request.property == "webid" && C.WebID) {
    sendResponse({ "webid": C.WebID });
  }
  else {
    sendResponse({});
  }

  return true;
});