Go: add new provider: google (#14395)

### What problem does this PR solve?

As title.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

internal/entity/model.go

@@ -149,8 +149,8 @@ type Features struct {
 }
 
 type ModelThinking struct {
-	DefaultValue bool `json:"default_value"`
-	ClearContent bool `json:"clear_content"`
+	DefaultValue  bool `json:"default_value"`
+	ClearThinking bool `json:"clear_thinking"`
 }
 
 // Model represents a single LLM model
@@ -226,37 +226,8 @@ func NewProviderManager(dirPath string) (*ProviderManager, error) {
 			return nil, fmt.Errorf("error parsing JSON from file %s: %w", filePath, err)
 		}
 
-		// Get support thinking models
-		modelSupportThinking := make(map[string]bool)
-		if provider.Features.Thinking != nil {
-			for _, modelName := range provider.Features.Thinking.SupportedModels {
-				modelSupportThinking[modelName] = true
-			}
-		}
-
-		modelClearThinking := make(map[string]bool)
-		if provider.Features.ClearThinking != nil {
-			for _, modelName := range provider.Features.ClearThinking.SupportedModels {
-				modelClearThinking[modelName] = true
-			}
-		}
-
 		for _, model := range provider.Models {
 			// if the prefix of mode.Name is matched with keys of modelSupportThinking
-			for modelPrefix, _ := range modelSupportThinking {
-				if strings.HasPrefix(model.Name, modelPrefix) {
-					model.Thinking = &ModelThinking{
-						DefaultValue: provider.Features.Thinking.DefaultValue,
-					}
-				}
-			}
-
-			for modelPrefix, _ := range modelClearThinking {
-				if strings.HasPrefix(model.Name, modelPrefix) {
-					model.Thinking.ClearContent = true
-				}
-			}
-
 			if provider.Type == "" {
 				pos := strings.Index(model.Name, "-")
 				modelType := model.Name[0:pos]
@@ -553,7 +524,7 @@ func ConvertToFeaturesMap(model *Model) map[string]interface{} {
 	if model.Thinking != nil {
 		thinkingMap := map[string]interface{}{
 			"default_value":   model.Thinking.DefaultValue,
-			"clear_reasoning": model.Thinking.ClearContent,
+			"clear_reasoning": model.Thinking.ClearThinking,
 		}
 		featuresMap["thinking"] = thinkingMap
 	}

internal/entity/models/factory.go

@@ -45,6 +45,8 @@ func (f *ModelFactory) CreateModelDriver(providerName string, baseURL map[string
 		return NewGiteeModel(baseURL, urlSuffix), nil
 	case "siliconflow":
 		return NewSiliconflowModel(baseURL, urlSuffix), nil
+	case "google":
+		return NewGoogleModel(baseURL, urlSuffix), nil
 	case "aliyun":
 		return NewAliyunModel(baseURL, urlSuffix), nil
 	default:

internal/entity/models/google.go

@@ -0,0 +1,173 @@
+//
+//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+package models
+
+import (
+	"context"
+	"fmt"
+	"ragflow/internal/logger"
+
+	"google.golang.org/genai"
+)
+
+// GoogleModel implements ModelDriver for Dummy AI
+type GoogleModel struct {
+	BaseURL   map[string]string
+	URLSuffix URLSuffix
+}
+
+// NewGoogleModel creates a new Google AI model instance
+func NewGoogleModel(baseURL map[string]string, urlSuffix URLSuffix) *GoogleModel {
+	return &GoogleModel{
+		BaseURL:   baseURL,
+		URLSuffix: urlSuffix,
+	}
+}
+
+func (z *GoogleModel) Name() string {
+	return "google"
+}
+
+// Chat sends a message and returns response
+func (z *GoogleModel) Chat(modelName, message *string, apiConfig *APIConfig, chatModelConfig *ChatConfig) (*ChatResponse, error) {
+	ctx := context.Background()
+	client, err := genai.NewClient(ctx, &genai.ClientConfig{
+		APIKey:  *apiConfig.ApiKey,
+		Backend: genai.BackendGeminiAPI,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	contents := []*genai.Content{
+		genai.NewContentFromText(*message, genai.RoleUser),
+	}
+
+	generateContentConfig := &genai.GenerateContentConfig{}
+	generateContentConfig.ThinkingConfig = &genai.ThinkingConfig{}
+	if chatModelConfig.Thinking != nil && *chatModelConfig.Thinking {
+		generateContentConfig.ThinkingConfig.IncludeThoughts = true
+	} else {
+		generateContentConfig.ThinkingConfig.IncludeThoughts = false
+	}
+
+	response, err := client.Models.GenerateContent(ctx, *modelName, contents, generateContentConfig)
+	if err != nil {
+		return nil, err
+	}
+	content := response.Text()
+
+	var responseContent string
+	if chatModelConfig.Thinking != nil && *chatModelConfig.Thinking {
+		responseContent = response.Candidates[0].Content.Parts[0].Text
+	}
+
+	chatResponse := &ChatResponse{
+		Answer:        &content,
+		ReasonContent: &responseContent,
+	}
+	return chatResponse, nil
+}
+
+// ChatWithMessages sends multiple messages with roles and returns response
+func (z *GoogleModel) ChatWithMessages(modelName string, apiKey *string, messages []Message, modelConfig *ChatConfig) (string, error) {
+	return "", fmt.Errorf("not implemented")
+}
+
+// ChatStreamlyWithSender sends a message and streams response via sender function (best performance, no channel)
+func (z *GoogleModel) ChatStreamlyWithSender(modelName, message *string, apiConfig *APIConfig, chatModelConfig *ChatConfig, sender func(*string, *string) error) error {
+	ctx := context.Background()
+	client, err := genai.NewClient(ctx, &genai.ClientConfig{
+		APIKey:  *apiConfig.ApiKey,
+		Backend: genai.BackendGeminiAPI,
+	})
+	if err != nil {
+		return err
+	}
+	contents := []*genai.Content{
+		genai.NewContentFromText(*message, genai.RoleUser),
+	}
+	for response, err := range client.Models.GenerateContentStream(
+		ctx,
+		*modelName,
+		contents,
+		nil,
+	) {
+		if err != nil {
+			return err
+		}
+
+		content := response.Text()
+
+		var responseContent string
+		if chatModelConfig.Thinking != nil && *chatModelConfig.Thinking {
+			responseContent = response.Candidates[0].Content.Parts[0].Text
+		}
+
+		if responseContent != "" {
+			logger.Info(fmt.Sprintf("Thinking: %s", responseContent))
+			if err = sender(nil, &responseContent); err != nil {
+				return err
+			}
+		}
+
+		if content != "" {
+			logger.Info(fmt.Sprintf("Answer: %s", responseContent))
+			if err = sender(&content, nil); err != nil {
+				return err
+			}
+		}
+	}
+
+	return err
+}
+
+// EncodeToEmbedding encodes a list of texts into embeddings
+func (z *GoogleModel) EncodeToEmbedding(modelName *string, texts []string, apiConfig *APIConfig, embeddingConfig *EmbeddingConfig) ([][]float64, error) {
+	return nil, fmt.Errorf("not implemented")
+}
+
+func (z *GoogleModel) ListModels(apiConfig *APIConfig) ([]string, error) {
+	ctx := context.Background()
+	client, err := genai.NewClient(ctx, &genai.ClientConfig{
+		APIKey:  *apiConfig.ApiKey,
+		Backend: genai.BackendGeminiAPI,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Retrieve the list of models.
+	models, err := client.Models.List(ctx, &genai.ListModelsConfig{})
+	if err != nil {
+		return nil, err
+	}
+
+	var modelNames []string
+	for _, m := range models.Items {
+		modelNames = append(modelNames, m.Name)
+	}
+	return modelNames, nil
+}
+
+func (z *GoogleModel) Balance(apiConfig *APIConfig) (map[string]interface{}, error) {
+	return nil, fmt.Errorf("no such method")
+}
+
+func (z *GoogleModel) CheckConnection(apiConfig *APIConfig) error {
+	return fmt.Errorf("no such method")
+}

internal/entity/models/zhipu-ai.go

@@ -208,9 +208,9 @@ func (z *ZhipuAIModel) ChatWithMessages(modelName string, apiKey *string, messag
 
 	// Build request body
 	reqBody := map[string]interface{}{
-		"model":      modelName,
-		"messages":   apiMessages,
-		"stream":     false,
+		"model":       modelName,
+		"messages":    apiMessages,
+		"stream":      false,
 		"temperature": 1,
 	}
 
@@ -404,16 +404,16 @@ func (z *ZhipuAIModel) ChatStreamlyWithSender(modelName, message *string, apiCon
 			continue
 		}
 
-		content, ok := delta["content"].(string)
-		if ok && content != "" {
-			if err := sender(&content, nil); err != nil {
+		reasoningContent, ok := delta["reasoning_content"].(string)
+		if ok && reasoningContent != "" {
+			if err := sender(nil, &reasoningContent); err != nil {
 				return err
 			}
 		}
 
-		reasoningContent, ok := delta["reasoning_content"].(string)
-		if ok && reasoningContent != "" {
-			if err := sender(nil, &reasoningContent); err != nil {
+		content, ok := delta["content"].(string)
+		if ok && content != "" {
+			if err := sender(&content, nil); err != nil {
 				return err
 			}
 		}

internal/handler/providers.go

@@ -737,10 +737,10 @@ func (h *ProviderHandler) ChatToModel(c *gin.Context) {
 		}
 
 		// Stream response using sender function (best performance, no channel)
-		errorCode := h.modelProviderService.ChatToModelStreamWithSender(providerName, instanceName, req.ModelName, userID, req.Message, &apiConfig, &chatConfig, sender)
+		errorCode, err := h.modelProviderService.ChatToModelStreamWithSender(providerName, instanceName, req.ModelName, userID, req.Message, &apiConfig, &chatConfig, sender)
 
 		if errorCode != common.CodeSuccess {
-			c.SSEvent("error", "stream failed")
+			c.SSEvent("error", err.Error())
 		}
 		return
 	}

internal/service/model_service.go

@@ -844,15 +844,15 @@ func (m *ModelProviderService) ChatWithMessagesToModelByApiKey(providerName, mod
 }
 
 // ChatToModelStreamWithSender streams chat response directly via sender function (best performance, no channel)
-func (m *ModelProviderService) ChatToModelStreamWithSender(providerName, instanceName, modelName, userID, message string, apiConfig *modelModule.APIConfig, modelConfig *modelModule.ChatConfig, sender func(*string, *string) error) common.ErrorCode {
+func (m *ModelProviderService) ChatToModelStreamWithSender(providerName, instanceName, modelName, userID, message string, apiConfig *modelModule.APIConfig, modelConfig *modelModule.ChatConfig, sender func(*string, *string) error) (common.ErrorCode, error) {
 	// Get tenant ID from user
 	tenants, err := m.userTenantDAO.GetByUserIDAndRole(userID, "owner")
 	if err != nil {
-		return common.CodeServerError
+		return common.CodeServerError, err
 	}
 
 	if len(tenants) == 0 {
-		return common.CodeNotFound
+		return common.CodeNotFound, errors.New("user has no tenants")
 	}
 
 	tenantID := tenants[0].TenantID
@@ -860,30 +860,30 @@ func (m *ModelProviderService) ChatToModelStreamWithSender(providerName, instanc
 	// Check if provider exists
 	provider, err := m.modelProviderDAO.GetByTenantIDAndProviderName(tenantID, providerName)
 	if err != nil {
-		return common.CodeServerError
+		return common.CodeServerError, err
 	}
 
 	instance, err := m.modelInstanceDAO.GetByProviderIDAndInstanceName(provider.ID, instanceName)
 	if err != nil {
-		return common.CodeServerError
+		return common.CodeServerError, err
 	}
 
 	_, err = m.modelDAO.GetModelByProviderIDAndInstanceIDAndModelName(provider.ID, instance.ID, modelName)
 	if err != nil {
 		providerInfo := dao.GetModelProviderManager().FindProvider(providerName)
 		if providerInfo == nil {
-			return common.CodeNotFound
+			return common.CodeNotFound, err
 		}
 
 		_, err = dao.GetModelProviderManager().GetModelByName(providerName, modelName)
 		if err != nil {
-			return common.CodeNotFound
+			return common.CodeNotFound, err
 		}
 
 		var extra map[string]string
 		err = json.Unmarshal([]byte(instance.Extra), &extra)
 		if err != nil {
-			return common.CodeServerError
+			return common.CodeServerError, err
 		}
 
 		region := extra["region"]
@@ -893,13 +893,13 @@ func (m *ModelProviderService) ChatToModelStreamWithSender(providerName, instanc
 		// Direct call with sender function
 		err = providerInfo.ModelDriver.ChatStreamlyWithSender(&modelName, &message, apiConfig, modelConfig, sender)
 		if err != nil {
-			return common.CodeServerError
+			return common.CodeServerError, err
 		}
 
-		return common.CodeSuccess
+		return common.CodeSuccess, nil
 	}
 
-	return common.CodeServerError
+	return common.CodeServerError, errors.New("model is disabled")
 }
 
 func (m *ModelProviderService) GetDefaultModel(modelType entity.ModelType, tenantID string) (*entity.ModelCredentials, error) {