feat(api): remove Flutter client auth gates (#1513)

fluxer_api/src/api/utils/UserAgentUtils.ts

@@ -2,15 +2,12 @@
 
 import Bowser from 'bowser';
 import {Logger} from '../Logger';
-import {parseJsonRecord} from './JsonBoundaryUtils';
 
 interface UserAgentInfo {
 	clientOs: string;
 	detectedPlatform: string;
 }
 
-type FluxerClientProperties = Record<string, unknown>;
-
 const UNKNOWN_LABEL = 'Unknown';
 
 function formatName(name?: string | null): string {
@@ -33,57 +30,6 @@ function parseUserAgentSafe(userAgentRaw: string): UserAgentInfo {
 	}
 }
 
-export function isFluxerFlutterClient(request: Request): boolean {
-	const parsed = parseFluxerClientProperties(request);
-	return parsed?.client_runtime === 'flutter';
-}
-
-export function isFluxerFlutterAndroidClient(request: Request): boolean {
-	return isFluxerFlutterPlatformClient(request, 'android');
-}
-
-export function isFluxerFlutterIosClient(request: Request): boolean {
-	return (
-		isFluxerFlutterPlatformClient(request, 'ios') ||
-		isFluxerFlutterPlatformClient(request, 'iphone') ||
-		isFluxerFlutterPlatformClient(request, 'ipad') ||
-		isFluxerFlutterPlatformClient(request, 'ipod')
-	);
-}
-
-function isFluxerFlutterPlatformClient(request: Request, platform: string): boolean {
-	const platformCandidates = getFluxerFlutterPlatformCandidates(request);
-	if (!platformCandidates) return false;
-	const needle = platform.toLowerCase();
-	return platformCandidates.some((value) => typeof value === 'string' && value.toLowerCase().includes(needle));
-}
-
-function getFluxerFlutterPlatformCandidates(request: Request): Array<unknown> | null {
-	const parsed = parseFluxerClientProperties(request);
-	if (parsed?.client_runtime !== 'flutter') return null;
-	return [
-		parsed.client_os,
-		parsed.os,
-		parsed.operating_system,
-		parsed.platform,
-		parsed.device_platform,
-		parsed.client_platform,
-		parsed.user_agent,
-		request.headers.get('user-agent'),
-	];
-}
-
-function parseFluxerClientProperties(request: Request): FluxerClientProperties | null {
-	const encoded = request.headers.get('x-fluxer-client-properties');
-	if (!encoded) return null;
-	try {
-		const decoded = Buffer.from(encoded, 'base64').toString('utf8');
-		return parseJsonRecord(decoded);
-	} catch {
-		return null;
-	}
-}
-
 export function resolveSessionClientInfo(args: {userAgent: string | null; isDesktopClient: boolean | null}): {
 	clientOs: string;
 	clientPlatform: string;