Fix downloads

src-electron/ElectronUtilFunctions.ts

@@ -1,4 +1,6 @@
+import { randomBytes } from 'crypto'
 import { basename, parse } from 'path'
+import sanitize from 'sanitize-filename'
 import { inspect } from 'util'
 
 import { lower } from '../src-shared/UtilFunctions'
@@ -26,3 +28,26 @@ export function hasVideoExtension(name: string) {
 export function devLog(message: unknown) {
 	emitIpcEvent('errorLog', typeof message === 'string' ? message : inspect(message))
 }
+
+/**
+ * @returns `filename` with all invalid filename characters replaced.
+ */
+export function sanitizeFilename(filename: string): string {
+	const newFilename = sanitize(filename, {
+		replacement: ((invalidChar: string) => {
+			switch (invalidChar) {
+				case '<': return '❮'
+				case '>': return '❯'
+				case ':': return '꞉'
+				case '"': return "'"
+				case '/': return '／'
+				case '\\': return '⧵'
+				case '|': return '⏐'
+				case '?': return '？'
+				case '*': return '⁎'
+				default: return '_'
+			}
+		}),
+	})
+	return (newFilename === '' ? randomBytes(5).toString('hex') : newFilename)
+}