fix: the base64 format image_url for gemini

relay/channel/gemini/relay-gemini.go

@@ -83,6 +83,9 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest) *GeminiChatReques
 				if imageNum > GeminiVisionMaxImageNum {
 				if imageNum > GeminiVisionMaxImageNum {
 					continue
 					continue
 				}
 				}
+				// 判断是否是url
+				if strings.HasPrefix(part.ImageUrl.(dto.MessageImageUrl).Url, "http") {
+					// 是url，获取图片的类型和base64编码的数据
 					mimeType, data, _ := service.GetImageFromUrl(part.ImageUrl.(dto.MessageImageUrl).Url)
 					mimeType, data, _ := service.GetImageFromUrl(part.ImageUrl.(dto.MessageImageUrl).Url)
 					parts = append(parts, GeminiPart{
 					parts = append(parts, GeminiPart{
 						InlineData: &GeminiInlineData{
 						InlineData: &GeminiInlineData{
@@ -91,6 +94,19 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest) *GeminiChatReques
 						},
 						},
 					})
 					})
 				}
 				}
+				else{
+					_, format, base64String, err := service.DecodeBase64ImageData(part.ImageUrl.(dto.MessageImageUrl).Url)
+					if err != nil {
+						return nil, err
+					}
+					parts = append(parts, GeminiPart{
+						InlineData: &GeminiInlineData{
+							MimeType: "image/" + format,
+							Data:     base64String,
+						},
+					})
+				}
+			}
 		}
 		}
 		content.Parts = parts
 		content.Parts = parts