refactor: add validation to file upload methods

.gitignore

@@ -5,3 +5,4 @@
 .yarn/install-state.gz
 dist/
 node_modules/
+src/test.ts

src/Catbox.ts

@@ -1,7 +1,10 @@
-import fetch from 'node-fetch';
-import FormData from 'form-data';
-import { createReadStream } from 'fs';
-import { USER_AGENT, CATBOX_BASE_URL } from './constants';
+import fetch                            from 'node-fetch';
+import FormData                         from 'form-data';
+import { resolve }                      from 'node:path';
+import { createReadStream }             from 'node:fs';
+
+import { isValidFile }                  from './utils';
+import { USER_AGENT, CATBOX_BASE_URL }  from './constants';
 
 type UploadURLOptions = {
 	/**
@@ -120,11 +123,17 @@ export class Catbox {
 	 * @returns The uploaded file URL
 	 */
 	public async uploadFile(options: UploadFileOptions): Promise<string> {
-		const { path } = options;
-		const data = new FormData();
+		let { path } = options;
+			path = resolve(path);
+
+		if (!await isValidFile(path)) {
+			throw new Error(`Invalid file path ${path}`);
+		}
 
+		const data = new FormData();
 		data.append('reqtype', 'fileupload');
 		data.append('fileToUpload', createReadStream(path));
+
 		if (this._userHash) {
 			data.append('userhash', this._userHash);
 		}

src/Litterbox.ts

@@ -1,6 +1,9 @@
-import fetch from 'node-fetch';
-import FormData from 'form-data';
-import { createReadStream } from 'fs';
+import fetch                              from 'node-fetch';
+import FormData                           from 'form-data';
+import { resolve }                        from 'node:path';
+import { createReadStream }               from 'node:fs';
+
+import { isValidFile }                    from './utils';
 import { USER_AGENT, LITTERBOX_BASE_URL } from './constants';
 
 type UploadOptions = {
@@ -26,11 +29,18 @@ export class Litterbox {
 	 * @returns The uploaded file URL
 	 */
 	public async upload(options: UploadOptions): Promise<string> {
-		const { path, duration } = options;
+		let { path, duration } = options;
+			path = resolve(path);
+			duration = duration ?? '1h';
+
+		if (!await isValidFile(path)) {
+			throw new Error(`Invalid file path ${path}`);
+		}
+
 		const data = new FormData();
 		data.append('reqtype', 'fileupload');
 		data.append('fileToUpload', createReadStream(path));
-		data.append('time', duration ?? '1h');
+		data.append('time', duration);
 
 		const res = await fetch(LITTERBOX_BASE_URL, {
 			method: 'POST',

src/index.ts

@@ -1,2 +1,2 @@
-export { Catbox } from './Catbox';
+export { Catbox }    from './Catbox';
 export { Litterbox } from './Litterbox';

src/utils.ts

@@ -0,0 +1,11 @@
+import { stat } from 'node:fs/promises';
+
+export async function isValidFile(path: string): Promise<boolean> {
+	try {
+		const stats = await stat(path);
+
+		return stats.isFile();
+	} catch {
+		return false;
+	}
+};