Create api/chat.go

api/chat.go

@@ -0,0 +1,362 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+type OpenAIRequest struct {
+	Messages []Message `json:"messages"`
+	Stream   bool      `json:"stream"`
+	Model    string    `json:"model"`
+}
+
+type Message struct {
+	Role    string `json:"role"`
+	Content string `json:"content"`
+}
+
+type MerlinRequest struct {
+	Attachments []interface{} `json:"attachments"`
+	ChatId      string        `json:"chatId"`
+	Language    string        `json:"language"`
+	Message     struct {
+		Content  string `json:"content"`
+		Context  string `json:"context"`
+		ChildId  string `json:"childId"`
+		Id       string `json:"id"`
+		ParentId string `json:"parentId"`
+	} `json:"message"`
+	Metadata struct {
+		LargeContext  bool `json:"largeContext"`
+		MerlinMagic   bool `json:"merlinMagic"`
+		ProFinderMode bool `json:"proFinderMode"`
+		WebAccess     bool `json:"webAccess"`
+	} `json:"metadata"`
+	Mode  string `json:"mode"`
+	Model string `json:"model"`
+}
+
+type MerlinResponse struct {
+	Data struct {
+		Content string `json:"content"`
+	} `json:"data"`
+}
+
+type OpenAIResponse struct {
+	Id      string `json:"id"`
+	Object  string `json:"object"`
+	Created int64  `json:"created"`
+	Model   string `json:"model"`
+	Choices []struct {
+		Delta struct {
+			Content string `json:"content"`
+		} `json:"delta"`
+		Index        int    `json:"index"`
+		FinishReason string `json:"finish_reason"`
+	} `json:"choices"`
+}
+
+type TokenResponse struct {
+	IdToken string `json:"idToken"`
+}
+
+func getEnvOrDefault(key, defaultValue string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return defaultValue
+}
+
+func getToken() (string, error) {
+	tokenReq := struct {
+		UUID string `json:"uuid"`
+	}{
+		UUID: getEnvOrDefault("UUID", ""),
+	}
+
+	tokenReqBody, _ := json.Marshal(tokenReq)
+	resp, err := http.Post(
+		"https://getmerlin-main-server.vercel.app/generate",
+		"application/json",
+		strings.NewReader(string(tokenReqBody)),
+	)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	var tokenResp TokenResponse
+	if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil {
+		return "", err
+	}
+
+	return tokenResp.IdToken, nil
+}
+
+func Handler(w http.ResponseWriter, r *http.Request) {
+	authToken := r.Header.Get("Authorization")
+	envToken := getEnvOrDefault("AUTH_TOKEN", "")
+
+	if envToken != "" && authToken != "Bearer "+envToken {
+		http.Error(w, "Unauthorized", http.StatusUnauthorized)
+		return
+	}
+
+	if r.URL.Path != "/hf/v1/chat/completions" {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprintf(w, `{"status":"GetMerlin2Api Service Running...","message":"MoLoveSze..."}`)
+		return
+	}
+
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var openAIReq OpenAIRequest
+	if err := json.NewDecoder(r.Body).Decode(&openAIReq); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	var contextMessages []string
+	for i := 0; i < len(openAIReq.Messages)-1; i++ {
+		msg := openAIReq.Messages[i]
+		contextMessages = append(contextMessages, fmt.Sprintf("%s: %s", msg.Role, msg.Content))
+	}
+	context := strings.Join(contextMessages, "\n")
+	merlinReq := MerlinRequest{
+		Attachments: make([]interface{}, 0),
+		ChatId:      generateV1UUID(),
+		Language:    "AUTO",
+		Message: struct {
+			Content  string `json:"content"`
+			Context  string `json:"context"`
+			ChildId  string `json:"childId"`
+			Id       string `json:"id"`
+			ParentId string `json:"parentId"`
+		}{
+			Content:  openAIReq.Messages[len(openAIReq.Messages)-1].Content,
+			Context:  context,
+			ChildId:  generateUUID(),
+			Id:       generateUUID(),
+			ParentId: "root",
+		},
+		Mode:  "UNIFIED_CHAT",
+		Model: openAIReq.Model,
+		Metadata: struct {
+			LargeContext  bool `json:"largeContext"`
+			MerlinMagic   bool `json:"merlinMagic"`
+			ProFinderMode bool `json:"proFinderMode"`
+			WebAccess     bool `json:"webAccess"`
+		}{
+			LargeContext:  false,
+			MerlinMagic:   false,
+			ProFinderMode: false,
+			WebAccess:     false,
+		},
+	}
+	token, err := getToken()
+	if err != nil {
+		http.Error(w, "Failed to get token: "+err.Error(), http.StatusInternalServerError)
+		return
+	}
+	client := &http.Client{}
+	merlinReqBody, _ := json.Marshal(merlinReq)
+
+	req, _ := http.NewRequest("POST", "https://arcane.getmerlin.in/v1/thread/unified", strings.NewReader(string(merlinReqBody)))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "text/event-stream, text/event-stream")
+	req.Header.Set("Authorization", "Bearer "+token)
+	req.Header.Set("x-merlin-version", "web-merlin")
+	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36")
+	req.Header.Set("sec-ch-ua", `"Not(A:Brand";v="99", "Microsoft Edge";v="133", "Chromium";v="133"`)
+	req.Header.Set("sec-ch-ua-mobile", "?0")
+	req.Header.Set("sec-ch-ua-platform", "Windows")
+	req.Header.Set("Sec-Fetch-Site", "same-site")
+	req.Header.Set("Sec-Fetch-Mode", "cors")
+	req.Header.Set("Sec-Fetch-Dest", "empty")
+	req.Header.Set("host", "arcane.getmerlin.in")
+	var flusher http.Flusher
+	if openAIReq.Stream {
+		var ok bool
+		flusher, ok = w.(http.Flusher)
+		if !ok {
+			http.Error(w, "Streaming unsupported!", http.StatusInternalServerError)
+			return
+		}
+		w.Header().Set("Content-Type", "text/event-stream")
+		w.Header().Set("Cache-Control", "no-cache")
+		w.Header().Set("Connection", "keep-alive")
+		w.Header().Set("X-Accel-Buffering", "no")
+		w.Header().Set("Transfer-Encoding", "chunked")
+		defer func() {
+			if flusher != nil {
+				flusher.Flush()
+			}
+		}()
+	} else {
+		w.Header().Set("Content-Type", "application/json")
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	defer resp.Body.Close()
+
+	if !openAIReq.Stream {
+		var fullContent string
+		reader := bufio.NewReader(resp.Body)
+		for {
+			line, err := reader.ReadString('\n')
+			if err != nil {
+				if err == io.EOF {
+					break
+				}
+				continue
+			}
+
+			line = strings.TrimSpace(line)
+
+			if strings.HasPrefix(line, "event: message") {
+				dataLine, err := reader.ReadString('\n')
+				if err != nil {
+					continue
+				}
+				dataLine = strings.TrimSpace(dataLine)
+
+				if strings.HasPrefix(dataLine, "data: ") {
+					dataStr := strings.TrimPrefix(dataLine, "data: ")
+					var merlinResp MerlinResponse
+					if err := json.Unmarshal([]byte(dataStr), &merlinResp); err != nil {
+						continue
+					}
+					if merlinResp.Data.Content != " " {
+						fullContent += merlinResp.Data.Content
+					}
+				}
+			}
+		}
+
+		response := map[string]interface{}{
+			"id":      generateUUID(),
+			"object":  "chat.completion",
+			"created": getCurrentTimestamp(),
+			"model":   openAIReq.Model,
+			"choices": []map[string]interface{}{
+				{
+					"message": map[string]interface{}{
+						"role":    "assistant",
+						"content": fullContent,
+					},
+					"finish_reason": "stop",
+					"index":         0,
+				},
+			},
+		}
+		json.NewEncoder(w).Encode(response)
+		return
+	}
+
+	reader := bufio.NewReader(resp.Body)
+	for {
+		line, err := reader.ReadString('\n')
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			continue
+		}
+
+		if strings.HasPrefix(line, "event: message") {
+			dataLine, _ := reader.ReadString('\n')
+			var merlinResp MerlinResponse
+			json.Unmarshal([]byte(strings.TrimPrefix(dataLine, "data: ")), &merlinResp)
+
+			if merlinResp.Data.Content != "" {
+				openAIResp := OpenAIResponse{
+					Id:      generateUUID(),
+					Object:  "chat.completion.chunk",
+					Created: getCurrentTimestamp(),
+					Model:   openAIReq.Model,
+					Choices: []struct {
+						Delta struct {
+							Content string `json:"content"`
+						} `json:"delta"`
+						Index        int    `json:"index"`
+						FinishReason string `json:"finish_reason"`
+					}{{
+						Delta: struct {
+							Content string `json:"content"`
+						}{
+							Content: merlinResp.Data.Content,
+						},
+						Index:        0,
+						FinishReason: "",
+					}},
+				}
+
+				respData, _ := json.Marshal(openAIResp)
+				fmt.Fprintf(w, "data: %s\n\n", string(respData))
+				flusher.Flush()
+			}
+		}
+	}
+
+	finalResp := OpenAIResponse{
+		Id:      generateUUID(),
+		Object:  "chat.completion.chunk",
+		Created: getCurrentTimestamp(),
+		Model:   openAIReq.Model,
+		Choices: []struct {
+			Delta struct {
+				Content string `json:"content"`
+			} `json:"delta"`
+			Index        int    `json:"index"`
+			FinishReason string `json:"finish_reason"`
+		}{{
+			Delta: struct {
+				Content string `json:"content"`
+			}{Content: ""},
+			Index:        0,
+			FinishReason: "stop",
+		}},
+	}
+	respData, _ := json.Marshal(finalResp)
+	fmt.Fprintf(w, "data: %s\n\n", string(respData))
+	fmt.Fprintf(w, "data: [DONE]\n\n")
+	flusher.Flush()
+}
+
+func generateUUID() string {
+	return uuid.New().String()
+}
+
+func generateV1UUID() string {
+	uuidObj := uuid.Must(uuid.NewUUID())
+	return uuidObj.String()
+}
+
+func getCurrentTimestamp() int64 {
+	return time.Now().Unix()
+}
+
+func main() {
+	port := getEnvOrDefault("PORT", "7860")
+	http.HandleFunc("/", Handler)
+	fmt.Printf("Server starting on port %s...\n", port)
+	if err := http.ListenAndServe(":"+port, nil); err != nil {
+		fmt.Printf("Error starting server: %v\n", err)
+	}
+}