api/create-filename: relax sanitizeString and use fullwidth replacements

api/src/processing/create-filename.js

@@ -1,10 +1,25 @@
-const illegalCharacters = ['}', '{', '%', '>', '<', '^', ';', ':', '`', '$', '"', "@", '=', '?', '|', '*'];
+// characters that are disallowed on windows:
+// https://learn.microsoft.com/en-us/windows/win32/fileio/naming-a-file#naming-conventions
+const characterMap = {
+    '<':  '＜',
+    '>':  '＞',
+    ':':  '：',
+    '"':  '＂',
+    '/':  '／',
+    '\\': '＼',
+    '|': '｜',
+    '?': '？',
+    '*': '＊'
+};
 
-const sanitizeString = (string) => {
-    for (const i in illegalCharacters) {
-        string = string.replaceAll("/", "_").replaceAll("\\", "_")
-                       .replaceAll(illegalCharacters[i], '')
+export const sanitizeString = (string) => {
+    // remove any potential control characters the string might contain
+    string = string.replace(/[\u0000-\u001F\u007F-\u009F]/g, "");
+
+    for (const [ char, replacement ] of Object.entries(characterMap)) {
+        string = string.replaceAll(char, replacement);
     }
+
     return string;
 }