Download Active Response (#49)

This PR prompts you to save un-previewable file types and adds an option
to save to the response history.

src-web/lib/data/mimetypes.ts

@@ -206,3 +206,28 @@ export const mimeTypes = [
   'video/x-flv',
   'video/x-m4v',
 ];
+
+export function isBinaryContentType(contentType: string | null) {
+  const mimeType = contentType?.split(';')[0];
+  if (mimeType == null) return false;
+
+  const [first, second] = mimeType.split('/').map((s) => s.trim().toLowerCase());
+  if (first == 'text' || second == null) {
+    return false;
+  }
+
+  if (first != 'application') {
+    return true;
+  }
+
+  const isTextSubtype =
+    second === 'json' ||
+    second === 'ld+json' ||
+    second === 'x-httpd-php' ||
+    second === 'x-sh' ||
+    second === 'x-csh' ||
+    second === 'xhtml+xml' ||
+    second === 'xml';
+
+  return !isTextSubtype;
+}