Removing google drive integration

It's sad but it's not working. For multiple releases this should be
already broken which shows how often it's used.

As there is also a security issue related to that, it's better to
remove the feature completely. Whoever wants to rewrite it, feel free to
go.

This commit removes the Google Drive integration from HackMD's Frontend
editor and this way removes the need to provide any API key and Client
ID in the frontend.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

public/js/index.js

@@ -30,8 +30,6 @@ import {
 import {
     debug,
     DROPBOX_APP_KEY,
-    GOOGLE_API_KEY,
-    GOOGLE_CLIENT_ID,
     noteid,
     noteurl,
     urlpath,
@@ -908,29 +906,6 @@ if (DROPBOX_APP_KEY) {
   ui.toolbar.export.dropbox.hide()
 }
 
-// check if google api key and client id are set and load scripts
-if (GOOGLE_API_KEY && GOOGLE_CLIENT_ID) {
-  $('<script>')
-        .attr('type', 'text/javascript')
-        .attr('src', 'https://www.google.com/jsapi?callback=onGoogleAPILoaded')
-        .prop('async', true)
-        .prop('defer', true)
-        .appendTo('body')
-} else {
-  ui.toolbar.import.googleDrive.hide()
-  ui.toolbar.export.googleDrive.hide()
-}
-
-function onGoogleAPILoaded () {
-  $('<script>')
-        .attr('type', 'text/javascript')
-        .attr('src', 'https://apis.google.com/js/client:plusone.js?onload=onGoogleClientLoaded')
-        .prop('async', true)
-        .prop('defer', true)
-        .appendTo('body')
-}
-window.onGoogleAPILoaded = onGoogleAPILoaded
-
 // button actions
 // share
 ui.toolbar.publish.attr('href', noteurl + '/publish')
@@ -979,53 +954,6 @@ ui.toolbar.export.dropbox.click(function () {
   }
   Dropbox.save(options)
 })
-function uploadToGoogleDrive (accessToken) {
-  ui.spinner.show()
-  var filename = renderFilename(ui.area.markdown) + '.md'
-  var markdown = editor.getValue()
-  var blob = new Blob([markdown], {
-    type: 'text/markdown;charset=utf-8'
-  })
-  blob.name = filename
-  var uploader = new MediaUploader({
-    file: blob,
-    token: accessToken,
-    onComplete: function (data) {
-      data = JSON.parse(data)
-      showMessageModal('<i class="fa fa-cloud-upload"></i> Export to Google Drive', 'Export Complete!', data.alternateLink, 'Click here to view your file', true)
-      ui.spinner.hide()
-    },
-    onError: function (data) {
-      showMessageModal('<i class="fa fa-cloud-upload"></i> Export to Google Drive', 'Export Error :(', '', data, false)
-      ui.spinner.hide()
-    }
-  })
-  uploader.upload()
-}
-function googleApiAuth (immediate, callback) {
-  gapi.auth.authorize(
-    {
-      'client_id': GOOGLE_CLIENT_ID,
-      'scope': 'https://www.googleapis.com/auth/drive.file',
-      'immediate': immediate
-    }, callback || function () { })
-}
-function onGoogleClientLoaded () {
-  googleApiAuth(true)
-  buildImportFromGoogleDrive()
-}
-window.onGoogleClientLoaded = onGoogleClientLoaded
-// export to google drive
-ui.toolbar.export.googleDrive.click(function (e) {
-  var token = gapi.auth.getToken()
-  if (token) {
-    uploadToGoogleDrive(token.access_token)
-  } else {
-    googleApiAuth(false, function (result) {
-      uploadToGoogleDrive(result.access_token)
-    })
-  }
-})
 // export to gist
 ui.toolbar.export.gist.attr('href', noteurl + '/gist')
 // export to snippet
@@ -1075,38 +1003,6 @@ ui.toolbar.import.dropbox.click(function () {
   }
   Dropbox.choose(options)
 })
-// import from google drive
-function buildImportFromGoogleDrive () {
-  /* eslint-disable no-unused-vars */
-  let picker = new FilePicker({
-    apiKey: GOOGLE_API_KEY,
-    clientId: GOOGLE_CLIENT_ID,
-    buttonEl: ui.toolbar.import.googleDrive,
-    onSelect: function (file) {
-      if (file.downloadUrl) {
-        ui.spinner.show()
-        var accessToken = gapi.auth.getToken().access_token
-        $.ajax({
-          type: 'GET',
-          beforeSend: function (request) {
-            request.setRequestHeader('Authorization', 'Bearer ' + accessToken)
-          },
-          url: file.downloadUrl,
-          success: function (data) {
-            if (file.fileExtension === 'html') { parseToEditor(data) } else { replaceAll(data) }
-          },
-          error: function (data) {
-            showMessageModal('<i class="fa fa-cloud-download"></i> Import from Google Drive', 'Import failed :(', '', data, false)
-          },
-          complete: function () {
-            ui.spinner.hide()
-          }
-        })
-      }
-    }
-  })
-  /* eslint-enable no-unused-vars */
-}
 // import from gist
 ui.toolbar.import.gist.click(function () {
     // na