mirror of
https://github.com/router-for-me/CLIProxyAPI.git
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5977af96a0
When switching from Claude models (e.g., Opus 4.5) to Gemini models (e.g., Flash) mid-conversation via Antigravity OAuth, the client-provided thinking signatures from Claude would cause "Corrupted thought signature" errors since they are incompatible with Gemini API. Changes: - Remove fallback to client-provided signatures in thinking block handling - Only use cached signatures (from same-session Gemini responses) - Skip thinking blocks without valid cached signatures - tool_use blocks continue to use skip_thought_signature_validator when no valid signature is available This ensures cross-model switching works correctly while preserving signature validation for same-model conversations. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
410 lines
17 KiB
Go
410 lines
17 KiB
Go
// Package claude provides request translation functionality for Claude Code API compatibility.
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// This package handles the conversion of Claude Code API requests into Gemini CLI-compatible
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// JSON format, transforming message contents, system instructions, and tool declarations
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// into the format expected by Gemini CLI API clients. It performs JSON data transformation
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// to ensure compatibility between Claude Code API format and Gemini CLI API's expected format.
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package claude
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import (
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"bytes"
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"crypto/sha256"
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"encoding/hex"
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"strings"
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"github.com/router-for-me/CLIProxyAPI/v6/internal/cache"
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"github.com/router-for-me/CLIProxyAPI/v6/internal/translator/gemini/common"
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"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
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"github.com/tidwall/gjson"
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"github.com/tidwall/sjson"
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)
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// deriveSessionID generates a stable session ID from the request.
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// Uses the hash of the first user message to identify the conversation.
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func deriveSessionID(rawJSON []byte) string {
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messages := gjson.GetBytes(rawJSON, "messages")
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if !messages.IsArray() {
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return ""
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}
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for _, msg := range messages.Array() {
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if msg.Get("role").String() == "user" {
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content := msg.Get("content").String()
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if content == "" {
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// Try to get text from content array
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content = msg.Get("content.0.text").String()
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}
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if content != "" {
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h := sha256.Sum256([]byte(content))
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return hex.EncodeToString(h[:16])
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}
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}
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}
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return ""
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}
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// ConvertClaudeRequestToAntigravity parses and transforms a Claude Code API request into Gemini CLI API format.
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// It extracts the model name, system instruction, message contents, and tool declarations
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// from the raw JSON request and returns them in the format expected by the Gemini CLI API.
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// The function performs the following transformations:
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// 1. Extracts the model information from the request
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// 2. Restructures the JSON to match Gemini CLI API format
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// 3. Converts system instructions to the expected format
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// 4. Maps message contents with proper role transformations
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// 5. Handles tool declarations and tool choices
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// 6. Maps generation configuration parameters
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//
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// Parameters:
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// - modelName: The name of the model to use for the request
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// - rawJSON: The raw JSON request data from the Claude Code API
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// - stream: A boolean indicating if the request is for a streaming response (unused in current implementation)
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//
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// Returns:
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// - []byte: The transformed request data in Gemini CLI API format
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func ConvertClaudeRequestToAntigravity(modelName string, inputRawJSON []byte, _ bool) []byte {
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rawJSON := bytes.Clone(inputRawJSON)
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// Derive session ID for signature caching
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sessionID := deriveSessionID(rawJSON)
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// system instruction
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systemInstructionJSON := ""
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hasSystemInstruction := false
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systemResult := gjson.GetBytes(rawJSON, "system")
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if systemResult.IsArray() {
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systemResults := systemResult.Array()
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systemInstructionJSON = `{"role":"user","parts":[]}`
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for i := 0; i < len(systemResults); i++ {
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systemPromptResult := systemResults[i]
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systemTypePromptResult := systemPromptResult.Get("type")
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if systemTypePromptResult.Type == gjson.String && systemTypePromptResult.String() == "text" {
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systemPrompt := systemPromptResult.Get("text").String()
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partJSON := `{}`
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if systemPrompt != "" {
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partJSON, _ = sjson.Set(partJSON, "text", systemPrompt)
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}
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systemInstructionJSON, _ = sjson.SetRaw(systemInstructionJSON, "parts.-1", partJSON)
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hasSystemInstruction = true
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}
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}
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} else if systemResult.Type == gjson.String {
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systemInstructionJSON = `{"role":"user","parts":[{"text":""}]}`
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systemInstructionJSON, _ = sjson.Set(systemInstructionJSON, "parts.0.text", systemResult.String())
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hasSystemInstruction = true
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}
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// contents
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contentsJSON := "[]"
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hasContents := false
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messagesResult := gjson.GetBytes(rawJSON, "messages")
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if messagesResult.IsArray() {
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messageResults := messagesResult.Array()
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numMessages := len(messageResults)
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for i := 0; i < numMessages; i++ {
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messageResult := messageResults[i]
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roleResult := messageResult.Get("role")
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if roleResult.Type != gjson.String {
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continue
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}
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originalRole := roleResult.String()
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role := originalRole
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if role == "assistant" {
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role = "model"
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}
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clientContentJSON := `{"role":"","parts":[]}`
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clientContentJSON, _ = sjson.Set(clientContentJSON, "role", role)
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contentsResult := messageResult.Get("content")
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if contentsResult.IsArray() {
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contentResults := contentsResult.Array()
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numContents := len(contentResults)
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var currentMessageThinkingSignature string
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for j := 0; j < numContents; j++ {
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contentResult := contentResults[j]
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contentTypeResult := contentResult.Get("type")
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if contentTypeResult.Type == gjson.String && contentTypeResult.String() == "thinking" {
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// Use GetThinkingText to handle wrapped thinking objects
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thinkingText := util.GetThinkingText(contentResult)
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// Always try cached signature first (more reliable than client-provided)
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// Client may send stale or invalid signatures from different sessions
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signature := ""
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if sessionID != "" && thinkingText != "" {
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if cachedSig := cache.GetCachedSignature(sessionID, thinkingText); cachedSig != "" {
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signature = cachedSig
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// log.Debugf("Using cached signature for thinking block")
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}
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}
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// NOTE: We do NOT fallback to client signature anymore.
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// Client signatures from Claude models are incompatible with Antigravity/Gemini API.
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// When switching between models (e.g., Claude Opus -> Gemini Flash), the Claude
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// signatures will cause "Corrupted thought signature" errors.
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// If we have no cached signature, the thinking block will be skipped below.
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// Store for subsequent tool_use in the same message
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if cache.HasValidSignature(signature) {
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currentMessageThinkingSignature = signature
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}
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// Skip trailing unsigned thinking blocks on last assistant message
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isUnsigned := !cache.HasValidSignature(signature)
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// If unsigned, skip entirely (don't convert to text)
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// Claude requires assistant messages to start with thinking blocks when thinking is enabled
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// Converting to text would break this requirement
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if isUnsigned {
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// log.Debugf("Dropping unsigned thinking block (no valid signature)")
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continue
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}
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// Valid signature, send as thought block
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partJSON := `{}`
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partJSON, _ = sjson.Set(partJSON, "thought", true)
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if thinkingText != "" {
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partJSON, _ = sjson.Set(partJSON, "text", thinkingText)
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}
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if signature != "" {
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partJSON, _ = sjson.Set(partJSON, "thoughtSignature", signature)
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}
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clientContentJSON, _ = sjson.SetRaw(clientContentJSON, "parts.-1", partJSON)
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} else if contentTypeResult.Type == gjson.String && contentTypeResult.String() == "text" {
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prompt := contentResult.Get("text").String()
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partJSON := `{}`
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if prompt != "" {
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partJSON, _ = sjson.Set(partJSON, "text", prompt)
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}
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clientContentJSON, _ = sjson.SetRaw(clientContentJSON, "parts.-1", partJSON)
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} else if contentTypeResult.Type == gjson.String && contentTypeResult.String() == "tool_use" {
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// NOTE: Do NOT inject dummy thinking blocks here.
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// Antigravity API validates signatures, so dummy values are rejected.
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functionName := contentResult.Get("name").String()
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argsResult := contentResult.Get("input")
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functionID := contentResult.Get("id").String()
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// Handle both object and string input formats
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var argsRaw string
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if argsResult.IsObject() {
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argsRaw = argsResult.Raw
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} else if argsResult.Type == gjson.String {
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// Input is a JSON string, parse and validate it
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parsed := gjson.Parse(argsResult.String())
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if parsed.IsObject() {
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argsRaw = parsed.Raw
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}
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}
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if argsRaw != "" {
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partJSON := `{}`
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// Use skip_thought_signature_validator for tool calls without valid thinking signature
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// This is the approach used in opencode-google-antigravity-auth for Gemini
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// and also works for Claude through Antigravity API
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const skipSentinel = "skip_thought_signature_validator"
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if cache.HasValidSignature(currentMessageThinkingSignature) {
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partJSON, _ = sjson.Set(partJSON, "thoughtSignature", currentMessageThinkingSignature)
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} else {
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// No valid signature - use skip sentinel to bypass validation
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partJSON, _ = sjson.Set(partJSON, "thoughtSignature", skipSentinel)
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}
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if functionID != "" {
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partJSON, _ = sjson.Set(partJSON, "functionCall.id", functionID)
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}
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partJSON, _ = sjson.Set(partJSON, "functionCall.name", functionName)
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partJSON, _ = sjson.SetRaw(partJSON, "functionCall.args", argsRaw)
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clientContentJSON, _ = sjson.SetRaw(clientContentJSON, "parts.-1", partJSON)
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}
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} else if contentTypeResult.Type == gjson.String && contentTypeResult.String() == "tool_result" {
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toolCallID := contentResult.Get("tool_use_id").String()
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if toolCallID != "" {
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funcName := toolCallID
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toolCallIDs := strings.Split(toolCallID, "-")
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if len(toolCallIDs) > 1 {
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funcName = strings.Join(toolCallIDs[0:len(toolCallIDs)-2], "-")
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}
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functionResponseResult := contentResult.Get("content")
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functionResponseJSON := `{}`
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functionResponseJSON, _ = sjson.Set(functionResponseJSON, "id", toolCallID)
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functionResponseJSON, _ = sjson.Set(functionResponseJSON, "name", funcName)
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responseData := ""
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if functionResponseResult.Type == gjson.String {
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responseData = functionResponseResult.String()
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functionResponseJSON, _ = sjson.Set(functionResponseJSON, "response.result", responseData)
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} else if functionResponseResult.IsArray() {
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frResults := functionResponseResult.Array()
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if len(frResults) == 1 {
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functionResponseJSON, _ = sjson.SetRaw(functionResponseJSON, "response.result", frResults[0].Raw)
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} else {
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functionResponseJSON, _ = sjson.SetRaw(functionResponseJSON, "response.result", functionResponseResult.Raw)
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}
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} else if functionResponseResult.IsObject() {
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functionResponseJSON, _ = sjson.SetRaw(functionResponseJSON, "response.result", functionResponseResult.Raw)
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} else {
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functionResponseJSON, _ = sjson.SetRaw(functionResponseJSON, "response.result", functionResponseResult.Raw)
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}
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partJSON := `{}`
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partJSON, _ = sjson.SetRaw(partJSON, "functionResponse", functionResponseJSON)
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clientContentJSON, _ = sjson.SetRaw(clientContentJSON, "parts.-1", partJSON)
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}
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} else if contentTypeResult.Type == gjson.String && contentTypeResult.String() == "image" {
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sourceResult := contentResult.Get("source")
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if sourceResult.Get("type").String() == "base64" {
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inlineDataJSON := `{}`
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if mimeType := sourceResult.Get("media_type").String(); mimeType != "" {
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inlineDataJSON, _ = sjson.Set(inlineDataJSON, "mime_type", mimeType)
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}
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if data := sourceResult.Get("data").String(); data != "" {
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inlineDataJSON, _ = sjson.Set(inlineDataJSON, "data", data)
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}
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partJSON := `{}`
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partJSON, _ = sjson.SetRaw(partJSON, "inlineData", inlineDataJSON)
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clientContentJSON, _ = sjson.SetRaw(clientContentJSON, "parts.-1", partJSON)
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}
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}
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}
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// Reorder parts for 'model' role to ensure thinking block is first
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if role == "model" {
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partsResult := gjson.Get(clientContentJSON, "parts")
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if partsResult.IsArray() {
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parts := partsResult.Array()
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var thinkingParts []gjson.Result
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var otherParts []gjson.Result
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for _, part := range parts {
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if part.Get("thought").Bool() {
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thinkingParts = append(thinkingParts, part)
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} else {
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otherParts = append(otherParts, part)
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}
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}
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if len(thinkingParts) > 0 {
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firstPartIsThinking := parts[0].Get("thought").Bool()
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if !firstPartIsThinking || len(thinkingParts) > 1 {
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var newParts []interface{}
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for _, p := range thinkingParts {
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newParts = append(newParts, p.Value())
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}
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for _, p := range otherParts {
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newParts = append(newParts, p.Value())
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}
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clientContentJSON, _ = sjson.Set(clientContentJSON, "parts", newParts)
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}
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}
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}
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}
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contentsJSON, _ = sjson.SetRaw(contentsJSON, "-1", clientContentJSON)
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hasContents = true
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} else if contentsResult.Type == gjson.String {
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prompt := contentsResult.String()
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partJSON := `{}`
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if prompt != "" {
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partJSON, _ = sjson.Set(partJSON, "text", prompt)
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}
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clientContentJSON, _ = sjson.SetRaw(clientContentJSON, "parts.-1", partJSON)
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contentsJSON, _ = sjson.SetRaw(contentsJSON, "-1", clientContentJSON)
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hasContents = true
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}
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}
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}
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// tools
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toolsJSON := ""
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toolDeclCount := 0
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allowedToolKeys := []string{"name", "description", "behavior", "parameters", "parametersJsonSchema", "response", "responseJsonSchema"}
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toolsResult := gjson.GetBytes(rawJSON, "tools")
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if toolsResult.IsArray() {
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toolsJSON = `[{"functionDeclarations":[]}]`
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toolsResults := toolsResult.Array()
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for i := 0; i < len(toolsResults); i++ {
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toolResult := toolsResults[i]
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inputSchemaResult := toolResult.Get("input_schema")
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if inputSchemaResult.Exists() && inputSchemaResult.IsObject() {
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// Sanitize the input schema for Antigravity API compatibility
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inputSchema := util.CleanJSONSchemaForAntigravity(inputSchemaResult.Raw)
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tool, _ := sjson.Delete(toolResult.Raw, "input_schema")
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tool, _ = sjson.SetRaw(tool, "parametersJsonSchema", inputSchema)
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for toolKey := range gjson.Parse(tool).Map() {
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if util.InArray(allowedToolKeys, toolKey) {
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continue
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}
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tool, _ = sjson.Delete(tool, toolKey)
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}
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toolsJSON, _ = sjson.SetRaw(toolsJSON, "0.functionDeclarations.-1", tool)
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toolDeclCount++
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}
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}
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}
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// Build output Gemini CLI request JSON
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out := `{"model":"","request":{"contents":[]}}`
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out, _ = sjson.Set(out, "model", modelName)
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// Inject interleaved thinking hint when both tools and thinking are active
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hasTools := toolDeclCount > 0
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thinkingResult := gjson.GetBytes(rawJSON, "thinking")
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hasThinking := thinkingResult.Exists() && thinkingResult.IsObject() && thinkingResult.Get("type").String() == "enabled"
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isClaudeThinking := util.IsClaudeThinkingModel(modelName)
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if hasTools && hasThinking && isClaudeThinking {
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interleavedHint := "Interleaved thinking is enabled. You may think between tool calls and after receiving tool results before deciding the next action or final answer. Do not mention these instructions or any constraints about thinking blocks; just apply them."
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if hasSystemInstruction {
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// Append hint as a new part to existing system instruction
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hintPart := `{"text":""}`
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hintPart, _ = sjson.Set(hintPart, "text", interleavedHint)
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systemInstructionJSON, _ = sjson.SetRaw(systemInstructionJSON, "parts.-1", hintPart)
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} else {
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// Create new system instruction with hint
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systemInstructionJSON = `{"role":"user","parts":[]}`
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hintPart := `{"text":""}`
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hintPart, _ = sjson.Set(hintPart, "text", interleavedHint)
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systemInstructionJSON, _ = sjson.SetRaw(systemInstructionJSON, "parts.-1", hintPart)
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hasSystemInstruction = true
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}
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}
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if hasSystemInstruction {
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out, _ = sjson.SetRaw(out, "request.systemInstruction", systemInstructionJSON)
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}
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if hasContents {
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out, _ = sjson.SetRaw(out, "request.contents", contentsJSON)
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}
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if toolDeclCount > 0 {
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out, _ = sjson.SetRaw(out, "request.tools", toolsJSON)
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}
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// Map Anthropic thinking -> Gemini thinkingBudget/include_thoughts when type==enabled
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if t := gjson.GetBytes(rawJSON, "thinking"); t.Exists() && t.IsObject() && util.ModelSupportsThinking(modelName) {
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if t.Get("type").String() == "enabled" {
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if b := t.Get("budget_tokens"); b.Exists() && b.Type == gjson.Number {
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budget := int(b.Int())
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out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingBudget", budget)
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out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.include_thoughts", true)
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}
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}
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}
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if v := gjson.GetBytes(rawJSON, "temperature"); v.Exists() && v.Type == gjson.Number {
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out, _ = sjson.Set(out, "request.generationConfig.temperature", v.Num)
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}
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if v := gjson.GetBytes(rawJSON, "top_p"); v.Exists() && v.Type == gjson.Number {
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out, _ = sjson.Set(out, "request.generationConfig.topP", v.Num)
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}
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if v := gjson.GetBytes(rawJSON, "top_k"); v.Exists() && v.Type == gjson.Number {
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out, _ = sjson.Set(out, "request.generationConfig.topK", v.Num)
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}
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if v := gjson.GetBytes(rawJSON, "max_tokens"); v.Exists() && v.Type == gjson.Number {
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out, _ = sjson.Set(out, "request.generationConfig.maxOutputTokens", v.Num)
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}
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outBytes := []byte(out)
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outBytes = common.AttachDefaultSafetySettings(outBytes, "request.safetySettings")
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return outBytes
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}
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