Handle URL paths better (cross-seed#514)

added a `basePath` argument to `extractCredentialsFromURL` that should
hopefully prevent us from making the same mistake I made again.

```js
> extractCredentialsFromUrl('http://admin:adminadmin@localhost:8080/qbit')
OkResult {
  contents: {
    username: 'admin',
    password: 'adminadmin',
    href: 'http://localhost:8080/qbit'
  }
}
> extractCredentialsFromUrl('http://admin:adminadmin@localhost:8080')
OkResult {
  contents: {
    username: 'admin',
    password: 'adminadmin',
    href: 'http://localhost:8080'
  }
}
> extractCredentialsFromUrl('http://admin:adminadmin@localhost:8080/qbit', '/api/v2')
OkResult {
  contents: {
    username: 'admin',
    password: 'adminadmin',
    href: 'http://localhost:8080/qbit/api/v2'
  }
}
> extractCredentialsFromUrl('http://admin:adminadmin@localhost:8080', '/api/v2')
OkResult {
  contents: {
    username: 'admin',
    password: 'adminadmin',
    href: 'http://localhost:8080/api/v2'
  }
}
```

---------

Co-authored-by: zakary <[email protected]>

src/clients/QBittorrent.ts

@@ -87,18 +87,23 @@ interface Category {
 
 export default class QBittorrent implements TorrentClient {
 	cookie: string;
+	url: { username: string; password: string; href: string };
 
-	async login(): Promise<void> {
+	constructor() {
 		const { qbittorrentUrl } = getRuntimeConfig();
-		const { username, password, href } = extractCredentialsFromUrl(
-			qbittorrentUrl
+		this.url = extractCredentialsFromUrl(
+			qbittorrentUrl,
+			"/api/v2"
 		).unwrapOrThrow(
 			new CrossSeedError("qBittorrent url must be percent-encoded")
 		);
+	}
 
+	async login(): Promise<void> {
 		let response: Response;
+		const { href, username, password } = this.url;
 		try {
-			response = await fetch(`${href}api/v2/auth/login`, {
+			response = await fetch(`${href}/auth/login`, {
 				method: "POST",
 				body: new URLSearchParams({ username, password }),
 			});
@@ -137,10 +142,8 @@ export default class QBittorrent implements TorrentClient {
 			label: Label.QBITTORRENT,
 			message: `Making request to ${path} with body ${body.toString()}`,
 		});
-		const { qbittorrentUrl } = getRuntimeConfig();
-		const { href } =
-			extractCredentialsFromUrl(qbittorrentUrl).unwrapOrThrow();
-		const response = await fetch(`${href}api/v2${path}`, {
+
+		const response = await fetch(`${this.url.href}${path}`, {
 			method: "post",
 			headers: { Cookie: this.cookie, ...headers },
 			body,

src/utils.ts

@@ -1,4 +1,4 @@
-import { basename } from "path";
+import path, { basename, join } from "path";
 import {
 	EP_REGEX,
 	MOVIE_REGEX,
@@ -96,14 +96,19 @@ export function fallback<T>(...args: T[]): T {
 }
 
 export function extractCredentialsFromUrl(
-	url: string
+	url: string,
+	basePath?: string
 ): Result<{ username: string; password: string; href: string }, "invalid URL"> {
 	try {
 		const { origin, pathname, username, password } = new URL(url);
 		return resultOf({
 			username: decodeURIComponent(username),
 			password: decodeURIComponent(password),
-			href: origin + pathname,
+			href: basePath
+				? origin + path.posix.join(pathname, basePath)
+				: pathname === "/"
+				? origin
+				: origin + pathname,
 		});
 	} catch (e) {
 		return resultOfErr("invalid URL");