package executor import (	"bufio"	"bytes"	"context"	"fmt"	"io"	"net/http"	"strings"	"time" 	iflowauth "github.com/router-for-me/CLIProxyAPI/v6/internal/auth/iflow"	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"	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") const (	iflowDefaultEndpoint = "/chat/completions"	iflowUserAgent       = "iFlow-Cli") // IFlowExecutor executes OpenAI-compatible chat completions against the iFlow API using API keys derived from OAuth.type IFlowExecutor struct {	cfg *config.Config} // NewIFlowExecutor constructs a new executor instance.func NewIFlowExecutor(cfg *config.Config) *IFlowExecutor { return &IFlowExecutor{cfg: cfg} } // Identifier returns the provider key.func (e *IFlowExecutor) Identifier() string { return "iflow" } // PrepareRequest implements ProviderExecutor but requires no preprocessing.func (e *IFlowExecutor) PrepareRequest(_ *http.Request, _ *cliproxyauth.Auth) error { return nil } // Execute performs a non-streaming chat completion request.func (e *IFlowExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (resp cliproxyexecutor.Response, err error) {	apiKey, baseURL := iflowCreds(auth)	if strings.TrimSpace(apiKey) == "" {		err = fmt.Errorf("iflow executor: missing api key")		return resp, err	}	if baseURL == "" {		baseURL = iflowauth.DefaultAPIBaseURL	} 	reporter := newUsageReporter(ctx, e.Identifier(), req.Model, auth)	defer reporter.trackFailure(ctx, &err) 	from := opts.SourceFormat	to := sdktranslator.FromString("openai")	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), false)	body = applyPayloadConfig(e.cfg, req.Model, body) 	endpoint := strings.TrimSuffix(baseURL, "/") + iflowDefaultEndpoint 	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, bytes.NewReader(body))	if err != nil {		return resp, err	}	applyIFlowHeaders(httpReq, apiKey, false)	var authID, authLabel, authType, authValue string	if auth != nil {		authID = auth.ID		authLabel = auth.Label		authType, authValue = auth.AccountInfo()	}	recordAPIRequest(ctx, e.cfg, upstreamRequestLog{		URL:       endpoint,		Method:    http.MethodPost,		Headers:   httpReq.Header.Clone(),		Body:      body,		Provider:  e.Identifier(),		AuthID:    authID,		AuthLabel: authLabel,		AuthType:  authType,		AuthValue: authValue,	}) 	httpClient := newProxyAwareHTTPClient(ctx, e.cfg, auth, 0)	httpResp, err := httpClient.Do(httpReq)	if err != nil {		recordAPIResponseError(ctx, e.cfg, err)		return resp, err	}	defer func() {		if errClose := httpResp.Body.Close(); errClose != nil {			log.Errorf("iflow executor: close response body error: %v", errClose)		}	}()	recordAPIResponseMetadata(ctx, e.cfg, httpResp.StatusCode, httpResp.Header.Clone()) 	if httpResp.StatusCode < 200 || httpResp.StatusCode >= 300 {		b, _ := io.ReadAll(httpResp.Body)		appendAPIResponseChunk(ctx, e.cfg, b)		log.Debugf("iflow request error: status %d body %s", httpResp.StatusCode, summarizeErrorBody(httpResp.Header.Get("Content-Type"), b))		err = statusErr{code: httpResp.StatusCode, msg: string(b)}		return resp, err	} 	data, err := io.ReadAll(httpResp.Body)	if err != nil {		recordAPIResponseError(ctx, e.cfg, err)		return resp, err	}	appendAPIResponseChunk(ctx, e.cfg, data)	reporter.publish(ctx, parseOpenAIUsage(data)) 	var param any	out := sdktranslator.TranslateNonStream(ctx, to, from, req.Model, bytes.Clone(opts.OriginalRequest), body, data, &param)	resp = cliproxyexecutor.Response{Payload: []byte(out)}	return resp, nil} // ExecuteStream performs a streaming chat completion request.func (e *IFlowExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (stream <-chan cliproxyexecutor.StreamChunk, err error) {	apiKey, baseURL := iflowCreds(auth)	if strings.TrimSpace(apiKey) == "" {		err = fmt.Errorf("iflow executor: missing api key")		return nil, err	}	if baseURL == "" {		baseURL = iflowauth.DefaultAPIBaseURL	} 	reporter := newUsageReporter(ctx, e.Identifier(), req.Model, auth)	defer reporter.trackFailure(ctx, &err) 	from := opts.SourceFormat	to := sdktranslator.FromString("openai")	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), true) 	// Ensure tools array exists to avoid provider quirks similar to Qwen's behaviour.	toolsResult := gjson.GetBytes(body, "tools")	if toolsResult.Exists() && toolsResult.IsArray() && len(toolsResult.Array()) == 0 {		body = ensureToolsArray(body)	}	body = applyPayloadConfig(e.cfg, req.Model, body) 	endpoint := strings.TrimSuffix(baseURL, "/") + iflowDefaultEndpoint 	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, bytes.NewReader(body))	if err != nil {		return nil, err	}	applyIFlowHeaders(httpReq, apiKey, true)	var authID, authLabel, authType, authValue string	if auth != nil {		authID = auth.ID		authLabel = auth.Label		authType, authValue = auth.AccountInfo()	}	recordAPIRequest(ctx, e.cfg, upstreamRequestLog{		URL:       endpoint,		Method:    http.MethodPost,		Headers:   httpReq.Header.Clone(),		Body:      body,		Provider:  e.Identifier(),		AuthID:    authID,		AuthLabel: authLabel,		AuthType:  authType,		AuthValue: authValue,	}) 	httpClient := newProxyAwareHTTPClient(ctx, e.cfg, auth, 0)	httpResp, err := httpClient.Do(httpReq)	if err != nil {		recordAPIResponseError(ctx, e.cfg, err)		return nil, err	} 	recordAPIResponseMetadata(ctx, e.cfg, httpResp.StatusCode, httpResp.Header.Clone())	if httpResp.StatusCode < 200 || httpResp.StatusCode >= 300 {		data, _ := io.ReadAll(httpResp.Body)		if errClose := httpResp.Body.Close(); errClose != nil {			log.Errorf("iflow executor: close response body error: %v", errClose)		}		appendAPIResponseChunk(ctx, e.cfg, data)		log.Debugf("iflow streaming error: status %d body %s", httpResp.StatusCode, summarizeErrorBody(httpResp.Header.Get("Content-Type"), data))		err = statusErr{code: httpResp.StatusCode, msg: string(data)}		return nil, err	} 	out := make(chan cliproxyexecutor.StreamChunk)	stream = out	go func() {		defer close(out)		defer func() {			if errClose := httpResp.Body.Close(); errClose != nil {				log.Errorf("iflow executor: close response body error: %v", errClose)			}		}() 		scanner := bufio.NewScanner(httpResp.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 := parseOpenAIStreamUsage(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 errScan := scanner.Err(); errScan != nil {			recordAPIResponseError(ctx, e.cfg, errScan)			reporter.publishFailure(ctx)			out <- cliproxyexecutor.StreamChunk{Err: errScan}		}	}() 	return stream, nil} func (e *IFlowExecutor) CountTokens(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (cliproxyexecutor.Response, error) {	from := opts.SourceFormat	to := sdktranslator.FromString("openai")	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), false) 	enc, err := tokenizerForModel(req.Model)	if err != nil {		return cliproxyexecutor.Response{}, fmt.Errorf("iflow executor: tokenizer init failed: %w", err)	} 	count, err := countOpenAIChatTokens(enc, body)	if err != nil {		return cliproxyexecutor.Response{}, fmt.Errorf("iflow executor: token counting failed: %w", err)	} 	usageJSON := buildOpenAIUsageJSON(count)	translated := sdktranslator.TranslateTokenCount(ctx, to, from, count, usageJSON)	return cliproxyexecutor.Response{Payload: []byte(translated)}, nil} // Refresh refreshes OAuth tokens and updates the stored API key.func (e *IFlowExecutor) Refresh(ctx context.Context, auth *cliproxyauth.Auth) (*cliproxyauth.Auth, error) {	log.Debugf("iflow executor: refresh called")	if auth == nil {		return nil, fmt.Errorf("iflow executor: auth is nil")	} 	refreshToken := ""	oldAccessToken := ""	if auth.Metadata != nil {		if v, ok := auth.Metadata["refresh_token"].(string); ok {			refreshToken = strings.TrimSpace(v)		}		if v, ok := auth.Metadata["access_token"].(string); ok {			oldAccessToken = strings.TrimSpace(v)		}	}	if refreshToken == "" {		return auth, nil	} 	// Log the old access token (masked) before refresh	if oldAccessToken != "" {		log.Debugf("iflow executor: refreshing access token, old: %s", util.HideAPIKey(oldAccessToken))	} 	svc := iflowauth.NewIFlowAuth(e.cfg)	tokenData, err := svc.RefreshTokens(ctx, refreshToken)	if err != nil {		log.Errorf("iflow executor: token refresh failed: %v", err)		return nil, err	} 	if auth.Metadata == nil {		auth.Metadata = make(map[string]any)	}	auth.Metadata["access_token"] = tokenData.AccessToken	if tokenData.RefreshToken != "" {		auth.Metadata["refresh_token"] = tokenData.RefreshToken	}	if tokenData.APIKey != "" {		auth.Metadata["api_key"] = tokenData.APIKey	}	auth.Metadata["expired"] = tokenData.Expire	auth.Metadata["type"] = "iflow"	auth.Metadata["last_refresh"] = time.Now().Format(time.RFC3339) 	// Log the new access token (masked) after successful refresh	log.Debugf("iflow executor: token refresh successful, new: %s", util.HideAPIKey(tokenData.AccessToken)) 	if auth.Attributes == nil {		auth.Attributes = make(map[string]string)	}	if tokenData.APIKey != "" {		auth.Attributes["api_key"] = tokenData.APIKey	} 	return auth, nil} func applyIFlowHeaders(r *http.Request, apiKey string, stream bool) {	r.Header.Set("Content-Type", "application/json")	r.Header.Set("Authorization", "Bearer "+apiKey)	r.Header.Set("User-Agent", iflowUserAgent)	if stream {		r.Header.Set("Accept", "text/event-stream")	} else {		r.Header.Set("Accept", "application/json")	}} func iflowCreds(a *cliproxyauth.Auth) (apiKey, baseURL string) {	if a == nil {		return "", ""	}	if a.Attributes != nil {		if v := strings.TrimSpace(a.Attributes["api_key"]); v != "" {			apiKey = v		}		if v := strings.TrimSpace(a.Attributes["base_url"]); v != "" {			baseURL = v		}	}	if apiKey == "" && a.Metadata != nil {		if v, ok := a.Metadata["api_key"].(string); ok {			apiKey = strings.TrimSpace(v)		}	}	if baseURL == "" && a.Metadata != nil {		if v, ok := a.Metadata["base_url"].(string); ok {			baseURL = strings.TrimSpace(v)		}	}	return apiKey, baseURL} func ensureToolsArray(body []byte) []byte {	placeholder := `[{"type":"function","function":{"name":"noop","description":"Placeholder tool to stabilise streaming","parameters":{"type":"object"}}}]`	updated, err := sjson.SetRawBytes(body, "tools", []byte(placeholder))	if err != nil {		return body	}	return updated}