feat: add azure proxy

Author: stulzq

README.md

@@ -56,6 +56,27 @@ AZURE_OPENAI_MODEL_MAPPER: gpt-3.5-turbo=gpt-35-turbo
 
 API Key: This value can be found in the **Keys & Endpoint** section when examining your resource from the Azure portal. You can use either `KEY1` or `KEY2`. 
 
+### Proxy
+
+**HTTP Proxy**
+
+Env:
+
+````shell
+AZURE_OPENAI_HTTP_PROXY=http://127.0.0.1:1087
+````
+
+
+
+**Socks5 Proxy**
+
+Env:
+
+````shell
+AZURE_OPENAI_SOCKS_PROXY=socks5://127.0.0.1:1080
+````
+
+
 
 ### Use Docker
 

azure/proxy.go

@@ -85,6 +85,15 @@ func Proxy(c *gin.Context, requestConverter RequestConverter) {
 	}
 
 	proxy := &httputil.ReverseProxy{Director: director}
+	transport, err := util.NewProxyFromEnv()
+	if err != nil {
+		util.SendError(c, errors.Wrap(err, "get proxy error"))
+		return
+	}
+	if transport != nil {
+		proxy.Transport = transport
+	}
+
 	proxy.ServeHTTP(c.Writer, c.Request)
 
 	// issue: https://github.com/Chanzhaoyu/chatgpt-web/issues/831

constant/env.go

@@ -4,4 +4,7 @@ const (
 	ENV_AZURE_OPENAI_ENDPOINT     = "AZURE_OPENAI_ENDPOINT"
 	ENV_AZURE_OPENAI_API_VER      = "AZURE_OPENAI_API_VER"
 	ENV_AZURE_OPENAI_MODEL_MAPPER = "AZURE_OPENAI_MODEL_MAPPER"
+
+	ENV_AZURE_OPENAI_HTTP_PROXY  = "AZURE_OPENAI_HTTP_PROXY"
+	ENV_AZURE_OPENAI_SOCKS_PROXY = "AZURE_OPENAI_SOCKS_PROXY"
 )

util/http_proxy.go

@@ -4,13 +4,29 @@ import (
 	"context"
 	"encoding/base64"
 	"fmt"
+	"github.com/stulzq/azure-openai-proxy/constant"
 	"net"
 	"net/http"
 	"net/url"
+	"os"
 
 	"golang.org/x/net/proxy"
 )
 
+func NewProxyFromEnv() (*http.Transport, error) {
+	socksProxy := os.Getenv(constant.ENV_AZURE_OPENAI_SOCKS_PROXY)
+	if socksProxy != "" {
+		return NewSocksProxy(socksProxy)
+	}
+
+	httpProxy := os.Getenv(constant.ENV_AZURE_OPENAI_HTTP_PROXY)
+	if httpProxy != "" {
+		return NewHttpProxy(httpProxy)
+	}
+
+	return nil, nil
+}
+
 func NewHttpProxy(proxyAddress string) (*http.Transport, error) {
 	proxyURL, err := url.Parse(proxyAddress)
 	if err != nil {