Remove shadowsocks dependency

go.mod

 go 1.16
 
 require (
-	github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 // indirect
+	github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5
 	github.com/babolivier/go-doh-client v0.0.0-20201028162107-a76cff4cb8b6
 	github.com/libp2p/go-reuseport v0.0.2
-	github.com/mccutchen/go-httpbin v1.1.1 // indirect
+	github.com/mccutchen/go-httpbin v1.1.1
 	github.com/pelletier/go-toml v1.8.1
-	github.com/shadowsocks/go-shadowsocks2 v0.1.4
-	github.com/stretchr/testify v1.7.0 // indirect
+	github.com/stretchr/testify v1.7.0
 	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
 )

go.sum

 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 h1:f/FNXud6gA3MNr8meMVVGxhp+QBTqY91tM8HjEuMjGg=
-github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3/go.mod h1:HgjTstvQsPGkxUsCd2KWxErBblirPizecHcpD3ffK+s=
-github.com/shadowsocks/go-shadowsocks2 v0.1.4 h1:4VzajPL7RwwmImysBSvI+lm/UaegDGQq3hr42dYo3gs=
-github.com/shadowsocks/go-shadowsocks2 v0.1.4/go.mod h1:AGGpIoek4HRno4xzyFiAtLHkOpcoznZEkAccaI/rplM=
-github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83 h1:/ZScEX8SfEmUGRHs0gxpqteO5nfNW6axyZbBdw9A12g=
-golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 h1:qWPm9rbaAMKs8Bq/9LRpbMqxWRVUAQwMI9fVrssnTfw=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190228124157-a34e9553db1e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 h1:nxC68pudNYkKU6jWhgrqdreuFiOQWj1Fs7T3VrH4Pjw=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

mtglib/network/shadowsocks.go

-package network
-
-import (
-	"context"
-	"encoding/base64"
-	"fmt"
-	"net"
-	"net/url"
-	"strings"
-	"time"
-
-	shadowsocks "github.com/shadowsocks/go-shadowsocks2/core"
-	"golang.org/x/net/proxy"
-)
-
-type shadowsocksDialer struct {
-	Dialer
-
-	cipher shadowsocks.StreamConnCipher
-}
-
-func (s *shadowsocksDialer) Dial(network, address string) (net.Conn, error) {
-	return s.DialContext(context.Background(), network, address)
-}
-
-func (s *shadowsocksDialer) DialContext(ctx context.Context,
-	network, address string) (net.Conn, error) {
-	conn, err := s.Dialer.DialContext(ctx, network, address)
-	if err != nil {
-		return nil, err // nolint: wrapcheck
-	}
-
-	return s.cipher.StreamConn(conn), nil
-}
-
-func NewShadowsocksDialer(proxyURL *url.URL,
-	timeout time.Duration, bufferSize int) (Dialer, error) {
-	username := proxyURL.User.Username()
-
-	decoded, err := base64.RawURLEncoding.DecodeString(username)
-	if err != nil {
-		return nil, fmt.Errorf("cannot decode payload: %w", err)
-	}
-
-	chunks := strings.SplitN(string(decoded), ":", 2)
-	if len(chunks) != 2 {
-		return nil, fmt.Errorf("incorrect payload %s", username)
-	}
-
-	cipher, err := shadowsocks.PickCipher(chunks[0], nil, chunks[1])
-	if err != nil {
-		return nil, fmt.Errorf("cannot initialize shadowsocks cipher: %w", err)
-	}
-
-	socks5URL := *proxyURL
-	socks5URL.Scheme = "socks5"
-	socks5URL.User = nil
-
-	dialer, err := NewDefaultDialer(timeout, bufferSize)
-	if err != nil {
-		return nil, fmt.Errorf("cannot initialize a base dialer: %w", err)
-	}
-
-	ssDialer := &shadowsocksDialer{
-		Dialer: dialer,
-		cipher: cipher,
-	}
-
-	rv, err := proxy.FromURL(&socks5URL, ssDialer)
-	if err != nil {
-		return nil, fmt.Errorf("cannot initialize ss proxy dialer: %w", err)
-	}
-
-	return rv.(Dialer), nil
-}