// Package executor provides runtime execution capabilities for various AI service providers.// This file implements the Antigravity executor that proxies requests to the antigravity// upstream using OAuth credentials.package executor import (	"context"	"crypto/tls"	"encoding/json"	"fmt"	"net/http"	"strings"	"sync"	"time" 	"github.com/router-for-me/CLIProxyAPI/v7/internal/cache"	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"	"github.com/router-for-me/CLIProxyAPI/v7/internal/runtime/executor/helps"	internalsignature "github.com/router-for-me/CLIProxyAPI/v7/internal/signature"	antigravityclaude "github.com/router-for-me/CLIProxyAPI/v7/internal/translator/antigravity/claude"	"github.com/router-for-me/CLIProxyAPI/v7/internal/util"	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"	sdktranslator "github.com/router-for-me/CLIProxyAPI/v7/sdk/translator"	log "github.com/sirupsen/logrus"	"github.com/tidwall/gjson"	"github.com/tidwall/sjson") const (	antigravityBaseURLDaily                = "https://daily-cloudcode-pa.googleapis.com"	antigravitySandboxBaseURLDaily         = "https://daily-cloudcode-pa.sandbox.googleapis.com"	antigravityBaseURLProd                 = "https://cloudcode-pa.googleapis.com"	antigravityCountTokensPath             = "/v1internal:countTokens"	antigravityStreamPath                  = "/v1internal:streamGenerateContent"	antigravityGeneratePath                = "/v1internal:generateContent"	antigravityClientID                    = "1071006060591-tmhssin2h21lcre235vtolojh4g403ep.apps.googleusercontent.com"	antigravityClientSecret                = "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"	antigravityAuthType                    = "antigravity"	refreshSkew                            = 3000 * time.Second	antigravityCreditsHintRefreshInterval  = 10 * time.Minute	antigravityCreditsHintRefreshTimeout   = 5 * time.Second	antigravityShortQuotaCooldownThreshold = 5 * time.Minute	antigravityInstantRetryThreshold       = 3 * time.Second	// systemInstruction              = "You are Antigravity, a powerful agentic AI coding assistant designed by the Google Deepmind team working on Advanced Agentic Coding.You are pair programming with a USER to solve their coding task. The task may require creating a new codebase, modifying or debugging an existing codebase, or simply answering a question.**Absolute paths only****Proactiveness**") // AntigravityExecutor proxies requests to the antigravity upstream.type AntigravityExecutor struct {	cfg *config.Config} // NewAntigravityExecutor creates a new Antigravity executor instance.//// Parameters://   - cfg: The application configuration//// Returns://   - *AntigravityExecutor: A new Antigravity executor instancefunc NewAntigravityExecutor(cfg *config.Config) *AntigravityExecutor {	return &AntigravityExecutor{cfg: cfg}} func (e *AntigravityExecutor) obfuscateSensitiveWords(payload []byte) []byte {	if e == nil || e.cfg == nil || len(e.cfg.Antigravity.SensitiveWords) == 0 {		return payload	}	matcher := helps.BuildSensitiveWordMatcher(e.cfg.Antigravity.SensitiveWords)	return helps.ObfuscateSensitiveWordsInSystemInstruction(payload, matcher)} // antigravityTransport is a singleton HTTP/1.1 transport shared by all Antigravity requests.// It is initialized once via antigravityTransportOnce to avoid leaking a new connection pool// (and the goroutines managing it) on every request.var (	antigravityTransport     *http.Transport	antigravityTransportOnce sync.Once) func cloneTransportWithHTTP11(base *http.Transport) *http.Transport {	if base == nil {		return nil	} 	clone := base.Clone()	clone.ForceAttemptHTTP2 = false	// Wipe TLSNextProto to prevent implicit HTTP/2 upgrade.	clone.TLSNextProto = make(map[string]func(authority string, c *tls.Conn) http.RoundTripper)	if clone.TLSClientConfig == nil {		clone.TLSClientConfig = &tls.Config{}	} else {		clone.TLSClientConfig = clone.TLSClientConfig.Clone()	}	// Actively advertise only HTTP/1.1 in the ALPN handshake.	clone.TLSClientConfig.NextProtos = []string{"http/1.1"}	return clone} // initAntigravityTransport creates the shared HTTP/1.1 transport exactly once.func initAntigravityTransport() {	base, ok := http.DefaultTransport.(*http.Transport)	if !ok {		base = &http.Transport{}	}	antigravityTransport = cloneTransportWithHTTP11(base)} // newAntigravityHTTPClient creates an HTTP client specifically for Antigravity,// enforcing HTTP/1.1 by disabling HTTP/2 to perfectly mimic Node.js https defaults.// The underlying Transport is a singleton to avoid leaking connection pools.func newAntigravityHTTPClient(ctx context.Context, cfg *config.Config, auth *cliproxyauth.Auth, timeout time.Duration) *http.Client {	antigravityTransportOnce.Do(initAntigravityTransport) 	client := helps.NewProxyAwareHTTPClient(ctx, cfg, auth, timeout)	// If no transport is set, use the shared HTTP/1.1 transport.	if client.Transport == nil {		client.Transport = antigravityTransport		return client	} 	// Preserve proxy settings from proxy-aware transports while forcing HTTP/1.1.	if transport, ok := client.Transport.(*http.Transport); ok {		client.Transport = cloneTransportWithHTTP11(transport)	}	return client} func sanitizeAntigravityGeminiRequestSignatures(modelName string, rawJSON []byte) []byte {	if !antigravityUsesReasoningReplayCache(modelName) {		return rawJSON	}	rawJSON = internalsignature.SanitizeGeminiRequestThoughtSignatures(rawJSON, "request.contents")	return normalizeAntigravityGeminiFunctionResponseRoles(rawJSON)} func normalizeAntigravityGeminiFunctionResponseRoles(rawJSON []byte) []byte {	rawJSON = repairAntigravityGeminiFunctionResponseNames(rawJSON)	contents := util.GetGJSONBytesNoCopy(rawJSON, "request.contents")	if !contents.IsArray() {		return rawJSON	}	type functionRef struct {		id   string		name string	}	out := rawJSON	var pending []functionRef	for contentIndex, content := range contents.Array() {		parts := content.Get("parts")		if !parts.IsArray() || len(parts.Array()) == 0 {			pending = nil			continue		}		var calls, responses []functionRef		var responseParts []json.RawMessage		hasOtherPart := false		parts.ForEach(func(_, part gjson.Result) bool {			switch {			case part.Get("functionCall").Exists():				calls = append(calls, functionRef{id: part.Get("functionCall.id").String(), name: part.Get("functionCall.name").String()})			case part.Get("functionResponse").Exists():				responses = append(responses, functionRef{id: part.Get("functionResponse.id").String(), name: part.Get("functionResponse.name").String()})				responseParts = append(responseParts, json.RawMessage(part.Raw))			default:				hasOtherPart = true			}			return true		})		if len(calls) > 0 && len(responses) == 0 {			pending = calls			continue		}		if len(responses) == 0 {			if hasOtherPart {				pending = nil			}			continue		}		if hasOtherPart || len(calls) > 0 {			pending = nil			continue		} 		if len(pending) == len(responses) {			ordered := make([]json.RawMessage, 0, len(responseParts))			used := make([]bool, len(responses))			for _, call := range pending {				matched := -1				for responseIndex, response := range responses {					if used[responseIndex] {						continue					}					if (call.id != "" && response.id == call.id) || (call.id == "" && call.name != "" && response.name == call.name) {						matched = responseIndex						break					}				}				if matched < 0 {					ordered = nil					break				}				used[matched] = true				ordered = append(ordered, responseParts[matched])			}			if len(ordered) == len(responseParts) {				if encoded, errMarshal := json.Marshal(ordered); errMarshal == nil {					if updated, errSet := sjson.SetRawBytes(out, fmt.Sprintf("request.contents.%d.parts", contentIndex), encoded); errSet == nil {						out = updated					}				}			}		}		pending = nil		if content.Get("role").String() != "model" {			if updated, errSet := sjson.SetBytes(out, fmt.Sprintf("request.contents.%d.role", contentIndex), "model"); errSet == nil {				out = updated			}		}	}	return out} func repairAntigravityGeminiFunctionResponseNames(rawJSON []byte) []byte {	contents := util.GetGJSONBytesNoCopy(rawJSON, "request.contents")	if !contents.IsArray() {		return rawJSON	}	callIDToName := make(map[string]string)	contents.ForEach(func(_, content gjson.Result) bool {		parts := content.Get("parts")		if !parts.IsArray() {			return true		}		parts.ForEach(func(_, part gjson.Result) bool {			fc := part.Get("functionCall")			if fc.Exists() {				id := strings.TrimSpace(fc.Get("id").String())				name := strings.TrimSpace(fc.Get("name").String())				if id != "" && name != "" && name != "unknown" {					callIDToName[id] = name				}			}			return true		})		return true	})	if len(callIDToName) == 0 {		return rawJSON	} 	out := rawJSON	contents.ForEach(func(contentIdx, content gjson.Result) bool {		parts := content.Get("parts")		if !parts.IsArray() {			return true		}		parts.ForEach(func(partIdx, part gjson.Result) bool {			fr := part.Get("functionResponse")			if fr.Exists() {				id := strings.TrimSpace(fr.Get("id").String())				name := strings.TrimSpace(fr.Get("name").String())				if id != "" && (name == "" || name == "unknown") {					if realName, ok := callIDToName[id]; ok {						path := fmt.Sprintf("request.contents.%d.parts.%d.functionResponse.name", contentIdx.Int(), partIdx.Int())						if updated, errSet := sjson.SetBytes(out, path, realName); errSet == nil {							out = updated						}					}				}			}			return true		})		return true	})	return out} func validateAntigravityRequestSignatures(ctx context.Context, modelName string, from sdktranslator.Format, rawJSON []byte) ([]byte, error) {	if from.String() != "claude" {		return rawJSON, nil	}	before := countClaudeThinkingBlocks(rawJSON)	if antigravityUsesReasoningReplayCache(modelName) {		rawJSON = antigravityclaude.StripInvalidGeminiSignatureThinkingBlocks(rawJSON)		logAntigravitySignatureStrip(before, countClaudeThinkingBlocks(rawJSON), "provider_cleanup", "empty_or_non_gemini_signature")		return rawJSON, nil	}	// Claude models accept only Claude-format thinking signatures.	rawJSON = antigravityclaude.StripEmptySignatureThinkingBlocks(rawJSON)	logAntigravitySignatureStrip(before, countClaudeThinkingBlocks(rawJSON), "prefix_cleanup", "empty_or_non_claude_signature")	if cache.SignatureCacheEnabled() {		return rawJSON, nil	}	if !cache.SignatureBypassStrictMode() {		// Non-strict bypass: let the translator handle invalid signatures		// by dropping unsigned thinking blocks silently (no 400).		return rawJSON, nil	}	before = countClaudeThinkingBlocks(rawJSON)	rawJSON = antigravityclaude.StripInvalidBypassSignatureThinkingBlocks(rawJSON)	logAntigravitySignatureStrip(before, countClaudeThinkingBlocks(rawJSON), "strict_bypass", "invalid_antigravity_claude_signature")	return rawJSON, nil} func hasAntigravityClaudeTypedWebSearchTool(payload []byte) bool {	tools := util.GetGJSONBytesNoCopy(payload, "tools")	if !tools.IsArray() {		return false	}	for _, tool := range tools.Array() {		switch tool.Get("type").String() {		case "web_search_20250305", "web_search_20260209":			return true		}	}	return false} func hasAntigravityGoogleSearchTool(payload []byte) bool {	tools := util.GetGJSONBytesNoCopy(payload, "request.tools")	if !tools.IsArray() {		return false	}	for _, tool := range tools.Array() {		if tool.Get("googleSearch").Exists() {			return true		}	}	return false} func shouldResolveAntigravityWebSearchGroundingURLs(from sdktranslator.Format, originalRequestRawJSON, requestRawJSON []byte) bool {	return from.String() == "claude" &&		hasAntigravityClaudeTypedWebSearchTool(originalRequestRawJSON) &&		hasAntigravityGoogleSearchTool(requestRawJSON)} func (e *AntigravityExecutor) resolveWebSearchGroundingURLs(ctx context.Context, auth *cliproxyauth.Auth, from sdktranslator.Format, originalRequestRawJSON, requestRawJSON, responseRawJSON []byte) []byte {	if !shouldResolveAntigravityWebSearchGroundingURLs(from, originalRequestRawJSON, requestRawJSON) {		return responseRawJSON	}	return helps.ResolveAntigravityGroundingURLs(ctx, e.cfg, auth, responseRawJSON)} func countClaudeThinkingBlocks(rawJSON []byte) int {	messages := util.GetGJSONBytesNoCopy(rawJSON, "messages")	if !messages.IsArray() {		return 0	} 	count := 0	messages.ForEach(func(_, message gjson.Result) bool {		content := message.Get("content")		if !content.IsArray() {			return true		}		content.ForEach(func(_, part gjson.Result) bool {			if part.Get("type").String() == "thinking" {				count++			}			return true		})		return true	})	return count} func logAntigravitySignatureStrip(before, after int, stage, reason string) {	removed := before - after	if removed <= 0 {		return	}	log.WithFields(log.Fields{		"component":       "signature_sanitizer",		"executor":        "antigravity",		"target_provider": "claude",		"action":          "drop_thinking_blocks",		"stage":           stage,		"reason":          reason,		"count":           removed,	}).Debug("antigravity executor: dropped Claude thinking blocks with invalid signatures")} // Identifier returns the executor identifier.func (e *AntigravityExecutor) Identifier() string { return antigravityAuthType } // PrepareRequest injects Antigravity credentials into the outgoing HTTP request.func (e *AntigravityExecutor) PrepareRequest(req *http.Request, auth *cliproxyauth.Auth) error {	if req == nil {		return nil	}	token, _, errToken := e.ensureAccessToken(req.Context(), auth)	if errToken != nil {		return errToken	}	if strings.TrimSpace(token) == "" {		return statusErr{code: http.StatusUnauthorized, msg: "missing access token"}	}	req.Header.Set("Authorization", "Bearer "+token)	return nil} // HttpRequest injects Antigravity credentials into the request and executes it.// It uses a whitelist approach: all incoming headers are stripped and only// the minimum set required by the Antigravity protocol is explicitly set.func (e *AntigravityExecutor) HttpRequest(ctx context.Context, auth *cliproxyauth.Auth, req *http.Request) (*http.Response, error) {	if req == nil {		return nil, fmt.Errorf("antigravity executor: request is nil")	}	if ctx == nil {		ctx = req.Context()	}	httpReq := req.WithContext(ctx) 	// --- Whitelist: save only the headers we need from the original request ---	contentType := httpReq.Header.Get("Content-Type") 	// Wipe ALL incoming headers	for k := range httpReq.Header {		delete(httpReq.Header, k)	} 	// --- Set only the headers Antigravity actually sends ---	if contentType != "" {		httpReq.Header.Set("Content-Type", contentType)	}	// Content-Length is managed automatically by Go's http.Client from the Body	httpReq.Header.Set("User-Agent", resolveUserAgent(auth))	httpReq.Close = true // sends Connection: close 	// Inject Authorization: Bearer <token>	if err := e.PrepareRequest(httpReq, auth); err != nil {		return nil, err	} 	httpClient := newAntigravityHTTPClient(ctx, e.cfg, auth, 0)	return httpClient.Do(httpReq)}