feat: support qbittorrent (close #3087 in #3333)

* feat(qbittorrent): authorization and logging in support

* feat(qbittorrent/client): support `AddFromLink`

* refactor(qbittorrent/client): check authorization when getting a new client

* feat(qbittorrent/client): support `GetInfo`

* test(qbittorrent/client): update test cases

* feat(qbittorrent): init qbittorrent client on bootstrap

* feat(qbittorrent): support setting webui url via gin

* feat(qbittorrent/client): support deleting

* feat(qbittorrent/client): parse `TorrentStatus` enum when unmarshalling json in `GetInfo()`

* feat(qbittorrent/client): support getting files by id

* feat(qbittorrent): support adding qbittorrent tasks via gin

* refactor(qbittorrent/client): return a `Client` interface in `New()` instead of `*client`

* refactor: task handle

* chore: fix typo

* chore: change path

---------

Co-authored-by: Andy Hsu <i@nn.ci>

internal/qbittorrent/client_test.go

@@ -0,0 +1,152 @@
+package qbittorrent
+
+import (
+	"net/http"
+	"net/http/cookiejar"
+	"net/url"
+	"testing"
+)
+
+func TestLogin(t *testing.T) {
+	// test logging in with wrong password
+	u, err := url.Parse("http://admin:admin@127.0.0.1:8080/")
+	if err != nil {
+		t.Error(err)
+	}
+	jar, err := cookiejar.New(nil)
+	if err != nil {
+		t.Error(err)
+	}
+	var c = &client{
+		url:    u,
+		client: http.Client{Jar: jar},
+	}
+	err = c.login()
+	if err == nil {
+		t.Error(err)
+	}
+
+	// test logging in with correct password
+	u, err = url.Parse("http://admin:adminadmin@127.0.0.1:8080/")
+	if err != nil {
+		t.Error(err)
+	}
+	c.url = u
+	err = c.login()
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+// in this test, the `Bypass authentication for clients on localhost` option in qBittorrent webui should be disabled
+func TestAuthorized(t *testing.T) {
+	// init client
+	u, err := url.Parse("http://admin:adminadmin@127.0.0.1:8080/")
+	if err != nil {
+		t.Error(err)
+	}
+	jar, err := cookiejar.New(nil)
+	if err != nil {
+		t.Error(err)
+	}
+	var c = &client{
+		url:    u,
+		client: http.Client{Jar: jar},
+	}
+
+	// test without logging in, which should be unauthorized
+	authorized := c.authorized()
+	if authorized {
+		t.Error("Should not be authorized")
+	}
+
+	// test after logging in
+	err = c.login()
+	if err != nil {
+		t.Error(err)
+	}
+	authorized = c.authorized()
+	if !authorized {
+		t.Error("Should be authorized")
+	}
+}
+
+func TestNew(t *testing.T) {
+	_, err := New("http://admin:adminadmin@127.0.0.1:8080/")
+	if err != nil {
+		t.Error(err)
+	}
+	_, err = New("http://admin:wrong_password@127.0.0.1:8080/")
+	if err == nil {
+		t.Error("Should get an error")
+	}
+}
+
+func TestAdd(t *testing.T) {
+	// init client
+	c, err := New("http://admin:adminadmin@127.0.0.1:8080/")
+	if err != nil {
+		t.Error(err)
+	}
+
+	// test add
+	err = c.login()
+	if err != nil {
+		t.Error(err)
+	}
+	err = c.AddFromLink(
+		"https://releases.ubuntu.com/22.04/ubuntu-22.04.1-desktop-amd64.iso.torrent",
+		"D:\\qBittorrentDownload\\alist",
+		"uuid-1",
+	)
+	if err != nil {
+		t.Error(err)
+	}
+	err = c.AddFromLink(
+		"magnet:?xt=urn:btih:375ae3280cd80a8e9d7212e11dfaf7c45069dd35&dn=archlinux-2023.02.01-x86_64.iso",
+		"D:\\qBittorrentDownload\\alist",
+		"uuid-2",
+	)
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestGetInfo(t *testing.T) {
+	// init client
+	c, err := New("http://admin:adminadmin@127.0.0.1:8080/")
+	if err != nil {
+		t.Error(err)
+	}
+	_, err = c.GetInfo("uuid-1")
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestGetFiles(t *testing.T) {
+	// init client
+	c, err := New("http://admin:adminadmin@127.0.0.1:8080/")
+	if err != nil {
+		t.Error(err)
+	}
+	files, err := c.GetFiles("uuid-1")
+	if err != nil {
+		t.Error(err)
+	}
+	if len(files) != 1 {
+		t.Error("should have exactly one file")
+	}
+}
+
+func TestDelete(t *testing.T) {
+	// init client
+	c, err := New("http://admin:adminadmin@127.0.0.1:8080/")
+	if err != nil {
+		t.Error(err)
+	}
+	err = c.Delete("uuid-2")
+	if err != nil {
+		t.Error(err)
+	}
+}