Fix missing inline authorship colors

The hex2rgb function seems to previously have been available globally.
It probably got lost in the great Webpack refactoring and nobody noticed
 that.

 This copies the function into its own file (to make importing it easy)
 and adds an import in index.js.

 Fixes https://github.com/hedgedoc/hedgedoc/issues/2248

Signed-off-by: David Mehren <git@herrmehren.de>

public/.eslintrc.js

@@ -20,7 +20,6 @@ module.exports = {
     FilePicker: false,
     ot: false,
     MediaUploader: false,
-    hex2rgb: false,
     num_loaded: false,
     Visibility: false,
     inlineAttachment: false

public/docs/release-notes.md

@@ -6,6 +6,7 @@
 - Fix error that Libravatar user avatars were not shown when using OAuth2 login
 - Fix `bin/manage_users` not accepting numeric passwords (thanks to [@carr0t2](https://github.com/carr0t2) for reporting)
 - Fix visibility of modals for screen readers
+- Fix missing inline authorship colors (thanks to [@EBendinelli](https://github.com/EBendinelli) for reporting)
 
 ### Enhancements
 - Libravatar avatars render as ident-icons when no avatar image was uploaded to Libravatar or Gravatar

public/js/index.js

@@ -1,7 +1,7 @@
 /* eslint-env browser, jquery */
 /* eslint no-console: ["error", { allow: ["warn", "error", "debug"] }] */
 /* global Cookies, moment, serverurl,
-   key, Dropbox, hex2rgb, Visibility */
+   key, Dropbox, Visibility */
 
 import TurndownService from 'turndown'
 import CodeMirror from 'codemirror/lib/codemirror.js'
@@ -14,6 +14,7 @@ import Idle from 'Idle.Js'
 import '../vendor/jquery-textcomplete/jquery.textcomplete'
 
 import { ot } from '../vendor/ot/ot.min.js'
+import hex2rgb from '../vendor/ot/hex2rgb'
 
 import { saveAs } from 'file-saver'
 import randomColor from 'randomcolor'

public/vendor/ot/hex2rgb.js

@@ -0,0 +1,17 @@
+function hex2rgb (hex) {
+  if (hex[0] == '#') hex = hex.substr(1)
+  if (hex.length == 3) {
+    var temp = hex
+    hex = ''
+    temp = /^([a-f0-9])([a-f0-9])([a-f0-9])$/i.exec(temp).slice(1)
+    for (var i = 0; i < 3; i++) hex += temp[i] + temp[i]
+  }
+  var triplets = /^([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})$/i.exec(hex).slice(1)
+  return {
+    red: parseInt(triplets[0], 16),
+    green: parseInt(triplets[1], 16),
+    blue: parseInt(triplets[2], 16)
+  }
+}
+
+module.exports = hex2rgb