feat: 支持上传图片到钉钉平台，在图片生成流程中使用钉钉的图片 CDN 能力 (#225)

pkg/dingbot/client_test.go

@@ -0,0 +1,53 @@
+package dingbot
+
+import (
+	"bytes"
+	"github.com/eryajf/chatgpt-dingtalk/config"
+	"image"
+	"image/color"
+	"image/png"
+	"os"
+	"testing"
+)
+
+func TestUploadMedia_Pass_WithValidConfig(t *testing.T) {
+	// 设置了钉钉 ClientID 和 ClientSecret 的环境变量才执行以下测试，用于快速验证钉钉图片上传能力
+	clientId, clientSecret := os.Getenv("DINGTALK_CLIENT_ID_FOR_TEST"), os.Getenv("DINGTALK_CLIENT_SECRET_FOR_TEST")
+	if len(clientId) <= 0 || len(clientSecret) <= 0 {
+		return
+	}
+	credentials := []config.Credential{
+		config.Credential{
+			ClientID:     clientId,
+			ClientSecret: clientSecret,
+		},
+	}
+	client := NewDingTalkClientManager(&config.Configuration{Credentials: credentials}).GetClientByOAuthClientID(clientId)
+	var imageContent []byte
+	{
+		// 生成一张用于测试的图片
+		img := image.NewRGBA(image.Rect(0, 0, 200, 100))
+		blue := color.RGBA{0, 0, 255, 255}
+		for x := 0; x < img.Bounds().Dx(); x++ {
+			for y := 0; y < img.Bounds().Dy(); y++ {
+				img.Set(x, y, blue)
+			}
+		}
+		buf := new(bytes.Buffer)
+		err := png.Encode(buf, img)
+		if err != nil {
+			return
+		}
+		// get the byte array from the buffer
+		imageContent = buf.Bytes()
+	}
+	result, err := client.UploadMedia(imageContent, "filename.png", "image", "image/png")
+	if err != nil {
+		t.Errorf("upload media failed, err=%s", err.Error())
+		return
+	}
+	if result.MediaID == "" {
+		t.Errorf("upload media failed, empty media id")
+		return
+	}
+}