package executor import (	"bufio"	"bytes"	"context"	"fmt"	"io"	"net/http"	"strings"	"time" 	"github.com/klauspost/compress/zstd"	claudeauth "github.com/router-for-me/CLIProxyAPI/v6/internal/auth/claude"	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"	"github.com/router-for-me/CLIProxyAPI/v6/internal/misc"	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/auth"	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/executor"	sdktranslator "github.com/router-for-me/CLIProxyAPI/v6/sdk/translator"	log "github.com/sirupsen/logrus"	"github.com/tidwall/gjson"	"github.com/tidwall/sjson" 	"github.com/gin-gonic/gin") // ClaudeExecutor is a stateless executor for Anthropic Claude over the messages API.// If api_key is unavailable on auth, it falls back to legacy via ClientAdapter.type ClaudeExecutor struct {	cfg *config.Config} func NewClaudeExecutor(cfg *config.Config) *ClaudeExecutor { return &ClaudeExecutor{cfg: cfg} } func (e *ClaudeExecutor) Identifier() string { return "claude" } func (e *ClaudeExecutor) PrepareRequest(_ *http.Request, _ *cliproxyauth.Auth) error { return nil } func (e *ClaudeExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (cliproxyexecutor.Response, error) {	apiKey, baseURL := claudeCreds(auth) 	if baseURL == "" {		baseURL = "https://api.anthropic.com"	}	reporter := newUsageReporter(ctx, e.Identifier(), req.Model, auth)	from := opts.SourceFormat	to := sdktranslator.FromString("claude")	// Use streaming translation to preserve function calling, except for claude.	stream := from != to	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), stream) 	if !strings.HasPrefix(req.Model, "claude-3-5-haiku") {		body, _ = sjson.SetRawBytes(body, "system", []byte(misc.ClaudeCodeInstructions))	} 	url := fmt.Sprintf("%s/v1/messages?beta=true", baseURL)	recordAPIRequest(ctx, e.cfg, body)	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))	if err != nil {		return cliproxyexecutor.Response{}, err	}	applyClaudeHeaders(httpReq, apiKey, false) 	httpClient := newProxyAwareHTTPClient(ctx, e.cfg, auth, 0)	resp, err := httpClient.Do(httpReq)	if err != nil {		return cliproxyexecutor.Response{}, err	}	defer func() {		if errClose := resp.Body.Close(); errClose != nil {			log.Errorf("response body close error: %v", errClose)		}	}()	if resp.StatusCode < 200 || resp.StatusCode >= 300 {		b, _ := io.ReadAll(resp.Body)		appendAPIResponseChunk(ctx, e.cfg, b)		log.Debugf("request error, error status: %d, error body: %s", resp.StatusCode, string(b))		return cliproxyexecutor.Response{}, statusErr{code: resp.StatusCode, msg: string(b)}	}	reader := io.Reader(resp.Body)	var decoder *zstd.Decoder	if hasZSTDEcoding(resp.Header.Get("Content-Encoding")) {		decoder, err = zstd.NewReader(resp.Body)		if err != nil {			return cliproxyexecutor.Response{}, fmt.Errorf("failed to initialize zstd decoder: %w", err)		}		reader = decoder		defer decoder.Close()	}	data, err := io.ReadAll(reader)	if err != nil {		return cliproxyexecutor.Response{}, err	}	appendAPIResponseChunk(ctx, e.cfg, data)	if stream {		lines := bytes.Split(data, []byte("\n"))		for _, line := range lines {			if detail, ok := parseClaudeStreamUsage(line); ok {				reporter.publish(ctx, detail)			}		}	} else {		reporter.publish(ctx, parseClaudeUsage(data))	}	var param any	out := sdktranslator.TranslateNonStream(ctx, to, from, req.Model, bytes.Clone(opts.OriginalRequest), body, data, &param)	return cliproxyexecutor.Response{Payload: []byte(out)}, nil} func (e *ClaudeExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (<-chan cliproxyexecutor.StreamChunk, error) {	apiKey, baseURL := claudeCreds(auth) 	if baseURL == "" {		baseURL = "https://api.anthropic.com"	}	reporter := newUsageReporter(ctx, e.Identifier(), req.Model, auth)	from := opts.SourceFormat	to := sdktranslator.FromString("claude")	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), true)	body, _ = sjson.SetRawBytes(body, "system", []byte(misc.ClaudeCodeInstructions)) 	url := fmt.Sprintf("%s/v1/messages?beta=true", baseURL)	recordAPIRequest(ctx, e.cfg, body)	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))	if err != nil {		return nil, err	}	applyClaudeHeaders(httpReq, apiKey, true) 	httpClient := newProxyAwareHTTPClient(ctx, e.cfg, auth, 0)	resp, err := httpClient.Do(httpReq)	if err != nil {		return nil, err	}	if resp.StatusCode < 200 || resp.StatusCode >= 300 {		defer func() { _ = resp.Body.Close() }()		b, _ := io.ReadAll(resp.Body)		appendAPIResponseChunk(ctx, e.cfg, b)		log.Debugf("request error, error status: %d, error body: %s", resp.StatusCode, string(b))		return nil, statusErr{code: resp.StatusCode, msg: string(b)}	}	out := make(chan cliproxyexecutor.StreamChunk)	go func() {		defer close(out)		defer func() { _ = resp.Body.Close() }() 		// If from == to (Claude → Claude), directly forward the SSE stream without translation		if from == to {			scanner := bufio.NewScanner(resp.Body)			buf := make([]byte, 20_971_520)			scanner.Buffer(buf, 20_971_520)			for scanner.Scan() {				line := scanner.Bytes()				appendAPIResponseChunk(ctx, e.cfg, line)				if detail, ok := parseClaudeStreamUsage(line); ok {					reporter.publish(ctx, detail)				}				// Forward the line as-is to preserve SSE format				cloned := make([]byte, len(line)+1)				copy(cloned, line)				cloned[len(line)] = '\n'				out <- cliproxyexecutor.StreamChunk{Payload: cloned}			}			if err = scanner.Err(); err != nil {				out <- cliproxyexecutor.StreamChunk{Err: err}			}			return		} 		// For other formats, use translation		scanner := bufio.NewScanner(resp.Body)		buf := make([]byte, 20_971_520)		scanner.Buffer(buf, 20_971_520)		var param any		for scanner.Scan() {			line := scanner.Bytes()			appendAPIResponseChunk(ctx, e.cfg, line)			if detail, ok := parseClaudeStreamUsage(line); ok {				reporter.publish(ctx, detail)			}			chunks := sdktranslator.TranslateStream(ctx, to, from, req.Model, bytes.Clone(opts.OriginalRequest), body, bytes.Clone(line), &param)			for i := range chunks {				out <- cliproxyexecutor.StreamChunk{Payload: []byte(chunks[i])}			}		}		if err = scanner.Err(); err != nil {			out <- cliproxyexecutor.StreamChunk{Err: err}		}	}()	return out, nil} func (e *ClaudeExecutor) CountTokens(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (cliproxyexecutor.Response, error) {	apiKey, baseURL := claudeCreds(auth) 	if baseURL == "" {		baseURL = "https://api.anthropic.com"	} 	from := opts.SourceFormat	to := sdktranslator.FromString("claude")	// Use streaming translation to preserve function calling, except for claude.	stream := from != to	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), stream) 	if !strings.HasPrefix(req.Model, "claude-3-5-haiku") {		body, _ = sjson.SetRawBytes(body, "system", []byte(misc.ClaudeCodeInstructions))	} 	url := fmt.Sprintf("%s/v1/messages/count_tokens?beta=true", baseURL)	recordAPIRequest(ctx, e.cfg, body)	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))	if err != nil {		return cliproxyexecutor.Response{}, err	}	applyClaudeHeaders(httpReq, apiKey, false) 	httpClient := newProxyAwareHTTPClient(ctx, e.cfg, auth, 0)	resp, err := httpClient.Do(httpReq)	if err != nil {		return cliproxyexecutor.Response{}, err	}	defer func() {		if errClose := resp.Body.Close(); errClose != nil {			log.Errorf("response body close error: %v", errClose)		}	}()	if resp.StatusCode < 200 || resp.StatusCode >= 300 {		b, _ := io.ReadAll(resp.Body)		appendAPIResponseChunk(ctx, e.cfg, b)		return cliproxyexecutor.Response{}, statusErr{code: resp.StatusCode, msg: string(b)}	}	reader := io.Reader(resp.Body)	var decoder *zstd.Decoder	if hasZSTDEcoding(resp.Header.Get("Content-Encoding")) {		decoder, err = zstd.NewReader(resp.Body)		if err != nil {			return cliproxyexecutor.Response{}, fmt.Errorf("failed to initialize zstd decoder: %w", err)		}		reader = decoder		defer decoder.Close()	}	data, err := io.ReadAll(reader)	if err != nil {		return cliproxyexecutor.Response{}, err	}	appendAPIResponseChunk(ctx, e.cfg, data)	count := gjson.GetBytes(data, "input_tokens").Int()	out := sdktranslator.TranslateTokenCount(ctx, to, from, count, data)	return cliproxyexecutor.Response{Payload: []byte(out)}, nil} func (e *ClaudeExecutor) Refresh(ctx context.Context, auth *cliproxyauth.Auth) (*cliproxyauth.Auth, error) {	log.Debugf("claude executor: refresh called")	if auth == nil {		return nil, fmt.Errorf("claude executor: auth is nil")	}	var refreshToken string	if auth.Metadata != nil {		if v, ok := auth.Metadata["refresh_token"].(string); ok && v != "" {			refreshToken = v		}	}	if refreshToken == "" {		return auth, nil	}	svc := claudeauth.NewClaudeAuth(e.cfg)	td, err := svc.RefreshTokens(ctx, refreshToken)	if err != nil {		return nil, err	}	if auth.Metadata == nil {		auth.Metadata = make(map[string]any)	}	auth.Metadata["access_token"] = td.AccessToken	if td.RefreshToken != "" {		auth.Metadata["refresh_token"] = td.RefreshToken	}	auth.Metadata["email"] = td.Email	auth.Metadata["expired"] = td.Expire	auth.Metadata["type"] = "claude"	now := time.Now().Format(time.RFC3339)	auth.Metadata["last_refresh"] = now	return auth, nil} func hasZSTDEcoding(contentEncoding string) bool {	if contentEncoding == "" {		return false	}	parts := strings.Split(contentEncoding, ",")	for i := range parts {		if strings.EqualFold(strings.TrimSpace(parts[i]), "zstd") {			return true		}	}	return false} func applyClaudeHeaders(r *http.Request, apiKey string, stream bool) {	r.Header.Set("Authorization", "Bearer "+apiKey)	r.Header.Set("Content-Type", "application/json")	r.Header.Set("Anthropic-Beta", "claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14,fine-grained-tool-streaming-2025-05-14") 	var ginHeaders http.Header	if ginCtx, ok := r.Context().Value("gin").(*gin.Context); ok && ginCtx != nil && ginCtx.Request != nil {		ginHeaders = ginCtx.Request.Header	} 	misc.EnsureHeader(r.Header, ginHeaders, "Anthropic-Version", "2023-06-01")	misc.EnsureHeader(r.Header, ginHeaders, "Anthropic-Dangerous-Direct-Browser-Access", "true")	misc.EnsureHeader(r.Header, ginHeaders, "X-App", "cli")	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Helper-Method", "stream")	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Retry-Count", "0")	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Runtime-Version", "v24.3.0")	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Package-Version", "0.55.1")	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Runtime", "node")	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Lang", "js")	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Arch", "arm64")	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Os", "MacOS")	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Timeout", "60")	r.Header.Set("Connection", "keep-alive")	r.Header.Set("User-Agent", "claude-cli/1.0.83 (external, cli)")	r.Header.Set("Accept-Encoding", "gzip, deflate, br, zstd")	if stream {		r.Header.Set("Accept", "text/event-stream")		return	}	r.Header.Set("Accept", "application/json")} func claudeCreds(a *cliproxyauth.Auth) (apiKey, baseURL string) {	if a == nil {		return "", ""	}	if a.Attributes != nil {		apiKey = a.Attributes["api_key"]		baseURL = a.Attributes["base_url"]	}	if apiKey == "" && a.Metadata != nil {		if v, ok := a.Metadata["access_token"].(string); ok {			apiKey = v		}	}	return}