feat: add support for proxies to use with IRC and Indexers (#1421)

* feat: add support for proxies

* fix(http): release handler

* fix(migrations): define proxy early

* fix(migrations): pg proxy

* fix(proxy): list update delete

* fix(proxy): remove log and imports

* feat(irc): use proxy

* feat(irc): tests

* fix(web): update imports for ProxyForms.tsx

* fix(database): migration

* feat(proxy): test

* feat(proxy): validate proxy type

* feat(proxy): validate and test

* feat(proxy): improve validate and test

* feat(proxy): fix db schema

* feat(proxy): add db tests

* feat(proxy): handle http errors

* fix(http): imports

* feat(proxy): use proxy for indexer downloads

* feat(proxy): indexerforms select proxy

* feat(proxy): handle torrent download

* feat(proxy): skip if disabled

* feat(proxy): imports

* feat(proxy): implement in Feeds

* feat(proxy): update helper text indexer proxy

* feat(proxy): add internal cache

internal/proxy/service.go

@@ -0,0 +1,194 @@
+// Copyright (c) 2021 - 2024, Ludvig Lundgren and the autobrr contributors.
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package proxy
+
+import (
+	"context"
+	"net/http"
+	"net/url"
+	"time"
+
+	"github.com/autobrr/autobrr/internal/domain"
+	"github.com/autobrr/autobrr/internal/logger"
+	"github.com/autobrr/autobrr/pkg/errors"
+	"github.com/autobrr/autobrr/pkg/sharedhttp"
+
+	"github.com/rs/zerolog"
+	netProxy "golang.org/x/net/proxy"
+)
+
+type Service interface {
+	List(ctx context.Context) ([]domain.Proxy, error)
+	FindByID(ctx context.Context, id int64) (*domain.Proxy, error)
+	Store(ctx context.Context, p *domain.Proxy) error
+	Update(ctx context.Context, p *domain.Proxy) error
+	Delete(ctx context.Context, id int64) error
+	Test(ctx context.Context, p *domain.Proxy) error
+}
+
+type service struct {
+	log zerolog.Logger
+
+	repo  domain.ProxyRepo
+	cache map[int64]*domain.Proxy
+}
+
+func NewService(log logger.Logger, repo domain.ProxyRepo) Service {
+	return &service{
+		log:   log.With().Str("module", "proxy").Logger(),
+		repo:  repo,
+		cache: make(map[int64]*domain.Proxy),
+	}
+}
+
+func (s *service) Store(ctx context.Context, proxy *domain.Proxy) error {
+	if err := proxy.Validate(); err != nil {
+		return errors.Wrap(err, "validation error")
+	}
+
+	err := s.repo.Store(ctx, proxy)
+	if err != nil {
+		return err
+	}
+
+	s.cache[proxy.ID] = proxy
+
+	return nil
+}
+
+func (s *service) Update(ctx context.Context, proxy *domain.Proxy) error {
+	if err := proxy.Validate(); err != nil {
+		return errors.Wrap(err, "validation error")
+	}
+
+	err := s.repo.Update(ctx, proxy)
+	if err != nil {
+		return err
+	}
+
+	s.cache[proxy.ID] = proxy
+
+	// TODO update IRC handlers
+
+	return nil
+}
+
+func (s *service) FindByID(ctx context.Context, id int64) (*domain.Proxy, error) {
+	if proxy, ok := s.cache[id]; ok {
+		return proxy, nil
+	}
+
+	return s.repo.FindByID(ctx, id)
+}
+
+func (s *service) List(ctx context.Context) ([]domain.Proxy, error) {
+	return s.repo.List(ctx)
+}
+
+func (s *service) ToggleEnabled(ctx context.Context, id int64, enabled bool) error {
+	err := s.repo.ToggleEnabled(ctx, id, enabled)
+	if err != nil {
+		return err
+	}
+
+	v, ok := s.cache[id]
+	if !ok {
+		v.Enabled = !enabled
+		s.cache[id] = v
+	}
+
+	// TODO update IRC handlers
+
+	return nil
+}
+
+func (s *service) Delete(ctx context.Context, id int64) error {
+	err := s.repo.Delete(ctx, id)
+	if err != nil {
+		return err
+	}
+
+	delete(s.cache, id)
+
+	// TODO update IRC handlers
+
+	return nil
+}
+
+func (s *service) Test(ctx context.Context, proxy *domain.Proxy) error {
+	if !proxy.ValidProxyType() {
+		return errors.New("invalid proxy type %s", proxy.Type)
+	}
+
+	if proxy.Addr == "" {
+		return errors.New("proxy addr missing")
+	}
+
+	httpClient, err := GetProxiedHTTPClient(proxy)
+	if err != nil {
+		return errors.Wrap(err, "could not get http client")
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "https://autobrr.com", nil)
+	if err != nil {
+		return errors.Wrap(err, "could not create proxy request")
+	}
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return errors.Wrap(err, "could not connect to proxy server: %s", proxy.Addr)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return errors.New(resp.Status)
+	}
+
+	s.log.Debug().Msgf("proxy %s test OK!", proxy.Addr)
+
+	return nil
+}
+
+func GetProxiedHTTPClient(p *domain.Proxy) (*http.Client, error) {
+	proxyUrl, err := url.Parse(p.Addr)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not parse proxy url: %s", p.Addr)
+	}
+
+	// set user and pass if not empty
+	if p.User != "" && p.Pass != "" {
+		proxyUrl.User = url.UserPassword(p.User, p.Pass)
+	}
+
+	transport := sharedhttp.TransportTLSInsecure
+
+	// set user and pass if not empty
+	if p.User != "" && p.Pass != "" {
+		proxyUrl.User = url.UserPassword(p.User, p.Pass)
+	}
+
+	switch p.Type {
+	case domain.ProxyTypeSocks5:
+		proxyDialer, err := netProxy.FromURL(proxyUrl, netProxy.Direct)
+		if err != nil {
+			return nil, errors.Wrap(err, "could not create proxy dialer from url: %s", p.Addr)
+		}
+
+		proxyContextDialer, ok := proxyDialer.(netProxy.ContextDialer)
+		if !ok {
+			return nil, errors.Wrap(err, "proxy dialer does not expose DialContext(): %v", proxyDialer)
+		}
+
+		transport.DialContext = proxyContextDialer.DialContext
+
+	default:
+		return nil, errors.New("invalid proxy type: %s", p.Type)
+	}
+
+	client := &http.Client{
+		Timeout:   30 * time.Second,
+		Transport: transport,
+	}
+
+	return client, nil
+}