feat: add http & socks5 proxy

go.mod

@@ -6,11 +6,15 @@ require (
 	github.com/bytedance/sonic v1.8.6
 	github.com/gin-gonic/gin v1.7.7
 	github.com/pkg/errors v0.9.1
+	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.16.0
+	github.com/stretchr/testify v1.8.4
+	golang.org/x/net v0.10.0
 )
 
 require (
 	github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
@@ -27,10 +31,10 @@ require (
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pelletier/go-toml/v2 v2.0.8 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/spf13/afero v1.9.5 // indirect
 	github.com/spf13/cast v1.5.1 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/subosito/gotenv v1.4.2 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.11 // indirect

go.sum

@@ -212,8 +212,9 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-github.com/stretchr/testify v1.8.3 h1:RP3t2pwF7cMEbC1dqtB6poj3niw/9gnV4Cjg5oW5gtY=
 github.com/stretchr/testify v1.8.3/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/subosito/gotenv v1.4.2 h1:X1TuBLAMDFbaTAChgCBLu3DU3UPyELpnF2jjJ2cz/S8=
 github.com/subosito/gotenv v1.4.2/go.mod h1:ayKnFf/c6rvx/2iiLrJUk1e6plDbT3edrFNGqEflhK0=
 github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS4MhqMhdFk5YI=
@@ -309,6 +310,8 @@ golang.org/x/net v0.0.0-20201209123823-ac852fbbde11/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20201224014010-6772e930b67b/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
+golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=

util/http_proxy.go

@@ -0,0 +1,54 @@
+package util
+
+import (
+	"context"
+	"encoding/base64"
+	"fmt"
+	"net"
+	"net/http"
+	"net/url"
+
+	"golang.org/x/net/proxy"
+)
+
+func NewHttpProxy(proxyAddress string) (*http.Transport, error) {
+	proxyURL, err := url.Parse(proxyAddress)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing proxy URL: %v", err)
+	}
+
+	transport := &http.Transport{
+		Proxy: http.ProxyURL(proxyURL),
+	}
+
+	if proxyURL.User != nil {
+		proxyAuth := "Basic " + base64.StdEncoding.EncodeToString([]byte(proxyURL.User.String()))
+
+		transport.ProxyConnectHeader = http.Header{
+			"Proxy-Authorization": []string{proxyAuth},
+		}
+	}
+
+	return transport, nil
+}
+
+func NewSocksProxy(proxyAddress string) (*http.Transport, error) {
+	// proxyAddress: socks5://user:password@127.0.0.1:1080
+	proxyURL, err := url.Parse(proxyAddress)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing proxy URL: %v", err)
+	}
+
+	dialer, err := proxy.FromURL(proxyURL, proxy.Direct)
+	if err != nil {
+		return nil, fmt.Errorf("error creating proxy dialer: %v", err)
+	}
+
+	transport := &http.Transport{
+		DialContext: func(ctx context.Context, network, address string) (net.Conn, error) {
+			return dialer.Dial(network, address)
+		},
+	}
+
+	return transport, nil
+}

util/http_proxy_test.go

@@ -0,0 +1,41 @@
+package util
+
+import (
+	"github.com/stretchr/testify/assert"
+	"net/http"
+	"testing"
+)
+
+func TestHttpProxy(t *testing.T) {
+	proxyAddress := "http://127.0.0.1:1087"
+	transport, err := NewHttpProxy(proxyAddress)
+
+	assert.NoError(t, err)
+	assert.NotNil(t, transport)
+
+	client := &http.Client{
+		Transport: transport,
+	}
+
+	resp, err := client.Get("https://www.google.com")
+	assert.NoError(t, err)
+	assert.NotNil(t, resp)
+	assert.Equal(t, 200, resp.StatusCode)
+}
+
+func TestSocksProxy(t *testing.T) {
+	proxyAddress := "socks5://127.0.0.1:1080"
+	transport, err := NewSocksProxy(proxyAddress)
+
+	assert.NoError(t, err)
+	assert.NotNil(t, transport)
+
+	client := &http.Client{
+		Transport: transport,
+	}
+
+	resp, err := client.Get("https://www.google.com")
+	assert.NoError(t, err)
+	assert.NotNil(t, resp)
+	assert.Equal(t, 200, resp.StatusCode)
+}