Go: implement provider: HuggingFace (#14722)

### What problem does this PR solve?

Implement `HuggingFace` provider

### Type of change

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

conf/models/huggingface.json

@@ -0,0 +1,21 @@
+{
+  "name": "HuggingFace",
+  "url": {
+    "default": "https://router.huggingface.co/v1/"
+  },
+  "url-suffix": {
+    "chat": "chat/completions",
+    "models": "models",
+    "embedding": "hf-inference/models"
+  },
+  "class": "huggingface",
+  "models": [
+    {
+      "name": "openai/gpt-oss-120b:fastest",
+      "max_tokens": 32768,
+      "model_types": [
+        "chat"
+      ]
+    }
+  ]
+}

internal/entity/models/aliyun.go

@@ -58,7 +58,7 @@ func (z *AliyunModel) NewInstance(baseURL map[string]string) ModelDriver {
 }
 
 func (z *AliyunModel) Name() string {
-	return "siliconflow"
+	return "aliyun"
 }
 
 func (z *AliyunModel) ChatWithMessages(modelName string, messages []Message, apiConfig *APIConfig, chatModelConfig *ChatConfig) (*ChatResponse, error) {

internal/entity/models/factory.go

@@ -61,6 +61,8 @@ func (f *ModelFactory) CreateModelDriver(providerName string, baseURL map[string
 		return NewNvidiaModel(baseURL, urlSuffix), nil
 	case "openrouter":
 		return NewOpenRouterModel(baseURL, urlSuffix), nil
+	case "huggingface":
+		return NewHuggingFaceModel(baseURL, urlSuffix), nil
 	default:
 		return NewDummyModel(baseURL, urlSuffix), nil
 	}

internal/entity/models/huggingface.go

@@ -0,0 +1,481 @@
+package models
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"ragflow/internal/common"
+	"strings"
+	"time"
+)
+
+// HuggingFaceModel implements ModelDriver for HuggingFace
+type HuggingFaceModel struct {
+	BaseURL    map[string]string
+	URLSuffix  URLSuffix
+	httpClient *http.Client
+}
+
+// NewHuggingFaceModel creates a new huggingFace model instance
+func NewHuggingFaceModel(baseURL map[string]string, urlSuffix URLSuffix) *HuggingFaceModel {
+	return &HuggingFaceModel{
+		BaseURL:   baseURL,
+		URLSuffix: urlSuffix,
+		httpClient: &http.Client{
+			Timeout: 120 * time.Second,
+			Transport: &http.Transport{
+				MaxIdleConns:        10,
+				MaxIdleConnsPerHost: 100,
+				IdleConnTimeout:     90 * time.Second,
+				DisableCompression:  false,
+			},
+		},
+	}
+}
+func (h *HuggingFaceModel) NewInstance(baseURL map[string]string) ModelDriver {
+	return &HuggingFaceModel{
+		BaseURL:   baseURL,
+		URLSuffix: h.URLSuffix,
+		httpClient: &http.Client{
+			Timeout: 120 * time.Second,
+			Transport: &http.Transport{
+				MaxIdleConns:        10,
+				MaxIdleConnsPerHost: 100,
+				IdleConnTimeout:     90 * time.Second,
+				DisableCompression:  false,
+			},
+		},
+	}
+}
+
+func (h *HuggingFaceModel) Name() string {
+	return "huggingface"
+}
+
+func (h *HuggingFaceModel) ChatWithMessages(modelName string, messages []Message, apiConfig *APIConfig, chatModelConfig *ChatConfig) (*ChatResponse, error) {
+	if len(messages) == 0 {
+		return nil, fmt.Errorf("messages is empty")
+	}
+
+	var region = "default"
+	if apiConfig != nil && apiConfig.Region != nil && *apiConfig.Region != "" {
+		region = *apiConfig.Region
+	}
+
+	url := fmt.Sprintf("%s/%s", h.BaseURL[region], h.URLSuffix.Chat)
+
+	// Convert messages to the format expected by API
+	apiMessages := make([]map[string]interface{}, len(messages))
+	for i, msg := range messages {
+		apiMessages[i] = map[string]interface{}{
+			"role":    msg.Role,
+			"content": msg.Content,
+		}
+	}
+
+	// Build request body
+	reqBody := map[string]interface{}{
+		"model":       modelName,
+		"messages":    apiMessages,
+		"stream":      false,
+		"temperature": 0.6,
+	}
+
+	if chatModelConfig != nil {
+		if chatModelConfig.Stream != nil {
+			reqBody["stream"] = *chatModelConfig.Stream
+		}
+
+		if chatModelConfig.MaxTokens != nil {
+			reqBody["max_tokens"] = *chatModelConfig.MaxTokens
+		}
+
+		if chatModelConfig.Temperature != nil {
+			reqBody["temperature"] = *chatModelConfig.Temperature
+		}
+
+		if chatModelConfig.TopP != nil {
+			reqBody["top_p"] = *chatModelConfig.TopP
+		}
+
+		if chatModelConfig.Stop != nil {
+			reqBody["stop"] = *chatModelConfig.Stop
+		}
+
+		if chatModelConfig.Thinking != nil {
+			if *chatModelConfig.Thinking {
+				reqBody["thinking"] = map[string]interface{}{
+					"type": "enabled",
+				}
+			} else {
+				reqBody["thinking"] = map[string]interface{}{
+					"type": "disabled",
+				}
+			}
+		}
+	}
+
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	if apiConfig != nil && apiConfig.ApiKey != nil {
+		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
+	}
+
+	resp, err := h.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, string(body))
+	}
+
+	// Parse response
+	var result map[string]interface{}
+	if err = json.Unmarshal(body, &result); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	choices, ok := result["choices"].([]interface{})
+	if !ok || len(choices) == 0 {
+		return nil, fmt.Errorf("no choices in response")
+	}
+
+	firstChoice, ok := choices[0].(map[string]interface{})
+	if !ok {
+		return nil, fmt.Errorf("invalid choice format")
+	}
+
+	messageMap, ok := firstChoice["message"].(map[string]interface{})
+	if !ok {
+		return nil, fmt.Errorf("invalid message format")
+	}
+
+	content, ok := messageMap["content"].(string)
+	if !ok {
+		return nil, fmt.Errorf("invalid content format")
+	}
+
+	var reasonContent string
+	if chatModelConfig != nil && chatModelConfig.Thinking != nil && *chatModelConfig.Thinking {
+		reasonContent, ok = messageMap["reasoning_content"].(string)
+		if !ok {
+			return nil, fmt.Errorf("invalid content format")
+		}
+		// if first char of reasonContent is \n remove the \n
+		if reasonContent != "" && reasonContent[0] == '\n' {
+			reasonContent = reasonContent[1:]
+		}
+	}
+
+	chatResponse := &ChatResponse{
+		Answer:        &content,
+		ReasonContent: &reasonContent,
+	}
+
+	return chatResponse, nil
+}
+
+func (h *HuggingFaceModel) ChatStreamlyWithSender(modelName string, messages []Message, apiConfig *APIConfig, modelConfig *ChatConfig, sender func(*string, *string) error) error {
+	if len(messages) == 0 {
+		return fmt.Errorf("messages is empty")
+	}
+
+	var region = "default"
+	if apiConfig != nil && apiConfig.Region != nil && *apiConfig.Region != "" {
+		region = *apiConfig.Region
+	}
+
+	url := fmt.Sprintf("%s/chat/completions", h.BaseURL[region])
+
+	// Convert messages to API format
+	apiMessages := make([]map[string]interface{}, len(messages))
+	for i, msg := range messages {
+		apiMessages[i] = map[string]interface{}{
+			"role":    msg.Role,
+			"content": msg.Content,
+		}
+	}
+
+	// Build request body with streaming enabled
+	reqBody := map[string]interface{}{
+		"model":    modelName,
+		"messages": apiMessages,
+		"stream":   true,
+	}
+
+	if modelConfig.Stream != nil {
+		reqBody["stream"] = *modelConfig.Stream
+	}
+
+	if modelConfig.MaxTokens != nil {
+		reqBody["max_tokens"] = *modelConfig.MaxTokens
+	}
+
+	if modelConfig.Temperature != nil {
+		reqBody["temperature"] = *modelConfig.Temperature
+	}
+
+	if modelConfig.DoSample != nil {
+		reqBody["do_sample"] = *modelConfig.DoSample
+	}
+
+	if modelConfig.TopP != nil {
+		reqBody["top_p"] = *modelConfig.TopP
+	}
+
+	if modelConfig.Stop != nil {
+		reqBody["stop"] = *modelConfig.Stop
+	}
+
+	if modelConfig.Thinking != nil {
+		if *modelConfig.Thinking {
+			reqBody["thinking"] = map[string]interface{}{
+				"type": "enabled",
+			}
+		} else {
+			reqBody["thinking"] = map[string]interface{}{
+				"type": "disabled",
+			}
+		}
+	}
+
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
+
+	resp, err := h.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, string(body))
+	}
+
+	// SSE parsing: read line by line
+	scanner := bufio.NewScanner(resp.Body)
+	for scanner.Scan() {
+		line := scanner.Text()
+		common.Info(line)
+
+		// SSE data line starts with "data:"
+		if !strings.HasPrefix(line, "data:") {
+			continue
+		}
+
+		// Extract JSON after "data:"
+		data := strings.TrimSpace(line[5:])
+
+		// [DONE] marks the end of stream
+		if data == "[DONE]" {
+			break
+		}
+
+		// Parse the JSON event
+		var event map[string]interface{}
+		if err = json.Unmarshal([]byte(data), &event); err != nil {
+			continue
+		}
+
+		choices, ok := event["choices"].([]interface{})
+		if !ok || len(choices) == 0 {
+			continue
+		}
+
+		firstChoice, ok := choices[0].(map[string]interface{})
+		if !ok {
+			continue
+		}
+
+		delta, ok := firstChoice["delta"].(map[string]interface{})
+		if !ok {
+			continue
+		}
+
+		reasoningContent, ok := delta["reasoning_content"].(string)
+		if ok && reasoningContent != "" {
+			if err := sender(nil, &reasoningContent); err != nil {
+				return err
+			}
+		}
+
+		content, ok := delta["content"].(string)
+		if ok && content != "" {
+			if err := sender(&content, nil); err != nil {
+				return err
+			}
+		}
+
+		finishReason, ok := firstChoice["finish_reason"].(string)
+		if ok && finishReason != "" {
+			break
+		}
+	}
+
+	// Send [DONE] marker for OpenAI compatibility
+	endOfStream := "[DONE]"
+	if err = sender(&endOfStream, nil); err != nil {
+		return err
+	}
+
+	return scanner.Err()
+}
+
+type hfEmbeddingRequest struct {
+	Inputs []string `json:"inputs"`
+}
+
+type hfEmbeddingResponse [][]float64
+
+func (h *HuggingFaceModel) Encode(modelName *string, texts []string, apiConfig *APIConfig, embeddingConfig *EmbeddingConfig) ([][]float64, error) {
+	if len(texts) == 0 {
+		return [][]float64{}, nil
+	}
+
+	if modelName == nil || *modelName == "" {
+		return nil, fmt.Errorf("model name is required")
+	}
+
+	if apiConfig == nil || apiConfig.ApiKey == nil || *apiConfig.ApiKey == "" {
+		return nil, fmt.Errorf("api key is required")
+	}
+
+	reqBody := map[string]interface{}{
+		"inputs": texts,
+	}
+
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, err
+	}
+
+	url := fmt.Sprintf("https://router.huggingface.co/hf-inference/models/%s", *modelName)
+
+	req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
+
+	resp, err := h.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("HF embeddings API error: %s", string(body))
+	}
+
+	var result [][]float64
+	if err = json.Unmarshal(body, &result); err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}
+
+func (h *HuggingFaceModel) Rerank(modelName *string, query string, texts []string, apiConfig *APIConfig) ([]float64, error) {
+	return nil, fmt.Errorf("no such method")
+}
+
+func (h *HuggingFaceModel) ListModels(apiConfig *APIConfig) ([]string, error) {
+	var region = "default"
+	if apiConfig.Region != nil && *apiConfig.Region != "" {
+		region = *apiConfig.Region
+	}
+
+	url := fmt.Sprintf("%s/%s", h.BaseURL[region], h.URLSuffix.Models)
+
+	// Build request body
+	reqBody := map[string]interface{}{}
+
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	req, err := http.NewRequest("GET", url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", *apiConfig.ApiKey))
+
+	resp, err := h.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, string(body))
+	}
+
+	// Parse response
+	var result map[string]interface{}
+	if err = json.Unmarshal(body, &result); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	models := make([]string, 0)
+	for _, model := range result["data"].([]interface{}) {
+		modelMap := model.(map[string]interface{})
+		modelName := modelMap["id"].(string)
+		models = append(models, modelName)
+	}
+
+	return models, nil
+}
+
+func (h *HuggingFaceModel) Balance(apiConfig *APIConfig) (map[string]interface{}, error) {
+	return nil, fmt.Errorf("no such method")
+}
+
+func (h *HuggingFaceModel) CheckConnection(apiConfig *APIConfig) error {
+	_, err := h.ListModels(apiConfig)
+	return err
+}