refactor progress

packages/errors/src/error_handling/ErrorIntrospection.tsx

@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {APIErrorCodes} from '@fluxer/constants/src/ApiErrorCodes';
+import {FluxerError} from '@fluxer/errors/src/FluxerError';
+import {HTTPException} from 'hono/http-exception';
+
+const apiErrorCodeSet = new Set<string>(Object.values(APIErrorCodes));
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+	return typeof value === 'object' && value !== null;
+}
+
+function isApiErrorCode(value: unknown): value is string {
+	return typeof value === 'string' && apiErrorCodeSet.has(value);
+}
+
+export function getErrorRecord(err: unknown): Record<string, unknown> | null {
+	if (!isRecord(err)) {
+		return null;
+	}
+	return err;
+}
+
+export function resolveApiErrorCode(err: unknown): string | null {
+	if (err instanceof FluxerError) {
+		return err.code;
+	}
+
+	if (err instanceof HTTPException && 'code' in err && typeof err.code === 'string') {
+		if (isApiErrorCode(err.code)) {
+			return err.code;
+		}
+	}
+
+	const record = getErrorRecord(err);
+	if (!record) {
+		return null;
+	}
+
+	if (isApiErrorCode(record.code)) {
+		return record.code;
+	}
+
+	if (isApiErrorCode(record.message)) {
+		return record.message;
+	}
+
+	return null;
+}
+
+export function resolveErrorStatus(err: unknown): number | null {
+	if (err instanceof FluxerError || err instanceof HTTPException) {
+		return err.status;
+	}
+
+	const record = getErrorRecord(err);
+	if (!record || typeof record.status !== 'number') {
+		return null;
+	}
+
+	return record.status >= 100 && record.status <= 599 ? record.status : null;
+}
+
+export function resolveErrorData(err: unknown): Record<string, unknown> | undefined {
+	if (err instanceof HTTPException && 'data' in err && isRecord(err.data)) {
+		return err.data;
+	}
+
+	const record = getErrorRecord(err);
+	if (!record) {
+		return undefined;
+	}
+
+	if (isRecord(record.data)) {
+		return record.data;
+	}
+
+	return undefined;
+}
+
+export function resolveErrorHeaders(err: unknown): Record<string, string> | undefined {
+	if (err instanceof HTTPException && 'headers' in err && isRecord(err.headers)) {
+		const headers: Record<string, string> = {};
+		for (const [key, value] of Object.entries(err.headers)) {
+			if (typeof value === 'string') {
+				headers[key] = value;
+			}
+		}
+		return Object.keys(headers).length > 0 ? headers : undefined;
+	}
+
+	const record = getErrorRecord(err);
+	if (!record || !isRecord(record.headers)) {
+		return undefined;
+	}
+
+	const headers: Record<string, string> = {};
+	for (const [key, value] of Object.entries(record.headers)) {
+		if (typeof value === 'string') {
+			headers[key] = value;
+		}
+	}
+
+	return Object.keys(headers).length > 0 ? headers : undefined;
+}
+
+export function resolveMessageVariables(err: unknown): Record<string, unknown> | undefined {
+	if (err instanceof HTTPException && 'messageVariables' in err && isRecord(err.messageVariables)) {
+		return err.messageVariables;
+	}
+
+	const record = getErrorRecord(err);
+	if (!record) {
+		return undefined;
+	}
+
+	return isRecord(record.messageVariables) ? record.messageVariables : undefined;
+}
+
+export function resolveErrorMessage(err: unknown): string | undefined {
+	const record = getErrorRecord(err);
+	if (!record || typeof record.message !== 'string') {
+		return undefined;
+	}
+
+	return record.message;
+}
+
+export function hasApiErrorCode(value: string): boolean {
+	return apiErrorCodeSet.has(value);
+}