451 lines
14 KiB
Go
451 lines
14 KiB
Go
// Package antigravity provides a client for the Antigravity API.
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package antigravity
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"log"
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"net"
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"net/http"
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"net/url"
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"strings"
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"time"
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)
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// NewAPIRequestWithURL 使用指定的 base URL 创建 Antigravity API 请求（v1internal 端点）
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func NewAPIRequestWithURL(ctx context.Context, baseURL, action, accessToken string, body []byte) (*http.Request, error) {
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// 构建 URL，流式请求添加 ?alt=sse 参数
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apiURL := fmt.Sprintf("%s/v1internal:%s", baseURL, action)
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isStream := action == "streamGenerateContent"
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if isStream {
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apiURL += "?alt=sse"
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, apiURL, bytes.NewReader(body))
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if err != nil {
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return nil, err
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}
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// 基础 Headers（与 Antigravity-Manager 保持一致，只设置这 3 个）
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("Authorization", "Bearer "+accessToken)
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req.Header.Set("User-Agent", UserAgent)
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return req, nil
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}
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// NewAPIRequest 使用默认 URL 创建 Antigravity API 请求（v1internal 端点）
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// 向后兼容：仅使用默认 BaseURL
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func NewAPIRequest(ctx context.Context, action, accessToken string, body []byte) (*http.Request, error) {
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return NewAPIRequestWithURL(ctx, BaseURL, action, accessToken, body)
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}
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// TokenResponse Google OAuth token 响应
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type TokenResponse struct {
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AccessToken string `json:"access_token"`
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ExpiresIn int64 `json:"expires_in"`
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TokenType string `json:"token_type"`
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Scope string `json:"scope,omitempty"`
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RefreshToken string `json:"refresh_token,omitempty"`
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}
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// UserInfo Google 用户信息
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type UserInfo struct {
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Email string `json:"email"`
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Name string `json:"name,omitempty"`
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GivenName string `json:"given_name,omitempty"`
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FamilyName string `json:"family_name,omitempty"`
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Picture string `json:"picture,omitempty"`
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}
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// LoadCodeAssistRequest loadCodeAssist 请求
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type LoadCodeAssistRequest struct {
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Metadata struct {
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IDEType string `json:"ideType"`
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} `json:"metadata"`
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}
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// TierInfo 账户类型信息
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type TierInfo struct {
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ID string `json:"id"` // free-tier, g1-pro-tier, g1-ultra-tier
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Name string `json:"name"` // 显示名称
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Description string `json:"description"` // 描述
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}
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// UnmarshalJSON supports both legacy string tiers and object tiers.
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func (t *TierInfo) UnmarshalJSON(data []byte) error {
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data = bytes.TrimSpace(data)
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if len(data) == 0 || string(data) == "null" {
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return nil
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}
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if data[0] == '"' {
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var id string
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if err := json.Unmarshal(data, &id); err != nil {
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return err
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}
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t.ID = id
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return nil
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}
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type alias TierInfo
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var decoded alias
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if err := json.Unmarshal(data, &decoded); err != nil {
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return err
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}
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*t = TierInfo(decoded)
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return nil
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}
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// IneligibleTier 不符合条件的层级信息
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type IneligibleTier struct {
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Tier *TierInfo `json:"tier,omitempty"`
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// ReasonCode 不符合条件的原因代码，如 INELIGIBLE_ACCOUNT
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ReasonCode string `json:"reasonCode,omitempty"`
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ReasonMessage string `json:"reasonMessage,omitempty"`
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}
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// LoadCodeAssistResponse loadCodeAssist 响应
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type LoadCodeAssistResponse struct {
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CloudAICompanionProject string `json:"cloudaicompanionProject"`
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CurrentTier *TierInfo `json:"currentTier,omitempty"`
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PaidTier *TierInfo `json:"paidTier,omitempty"`
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IneligibleTiers []*IneligibleTier `json:"ineligibleTiers,omitempty"`
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}
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// GetTier 获取账户类型
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// 优先返回 paidTier（付费订阅级别），否则返回 currentTier
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func (r *LoadCodeAssistResponse) GetTier() string {
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if r.PaidTier != nil && r.PaidTier.ID != "" {
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return r.PaidTier.ID
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}
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if r.CurrentTier != nil {
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return r.CurrentTier.ID
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}
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return ""
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}
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// Client Antigravity API 客户端
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type Client struct {
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httpClient *http.Client
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}
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func NewClient(proxyURL string) *Client {
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client := &http.Client{
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Timeout: 30 * time.Second,
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}
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if strings.TrimSpace(proxyURL) != "" {
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if proxyURLParsed, err := url.Parse(proxyURL); err == nil {
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client.Transport = &http.Transport{
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Proxy: http.ProxyURL(proxyURLParsed),
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}
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}
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}
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return &Client{
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httpClient: client,
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}
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}
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// isConnectionError 判断是否为连接错误（网络超时、DNS 失败、连接拒绝）
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func isConnectionError(err error) bool {
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if err == nil {
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return false
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}
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// 检查超时错误
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var netErr net.Error
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if errors.As(err, &netErr) && netErr.Timeout() {
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return true
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}
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// 检查连接错误（DNS 失败、连接拒绝）
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var opErr *net.OpError
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if errors.As(err, &opErr) {
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return true
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}
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// 检查 URL 错误
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var urlErr *url.Error
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return errors.As(err, &urlErr)
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}
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// shouldFallbackToNextURL 判断是否应切换到下一个 URL
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// 与 Antigravity-Manager 保持一致：连接错误、429、408、404、5xx 触发 URL 降级
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func shouldFallbackToNextURL(err error, statusCode int) bool {
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if isConnectionError(err) {
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return true
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}
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return statusCode == http.StatusTooManyRequests ||
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statusCode == http.StatusRequestTimeout ||
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statusCode == http.StatusNotFound ||
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statusCode >= 500
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}
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// ExchangeCode 用 authorization code 交换 token
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func (c *Client) ExchangeCode(ctx context.Context, code, codeVerifier string) (*TokenResponse, error) {
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params := url.Values{}
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params.Set("client_id", ClientID)
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params.Set("client_secret", ClientSecret)
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params.Set("code", code)
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params.Set("redirect_uri", RedirectURI)
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params.Set("grant_type", "authorization_code")
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params.Set("code_verifier", codeVerifier)
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, TokenURL, strings.NewReader(params.Encode()))
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if err != nil {
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return nil, fmt.Errorf("创建请求失败: %w", err)
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}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("token 交换请求失败: %w", err)
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}
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defer func() { _ = resp.Body.Close() }()
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bodyBytes, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("读取响应失败: %w", err)
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}
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("token 交换失败 (HTTP %d): %s", resp.StatusCode, string(bodyBytes))
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}
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var tokenResp TokenResponse
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if err := json.Unmarshal(bodyBytes, &tokenResp); err != nil {
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return nil, fmt.Errorf("token 解析失败: %w", err)
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}
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return &tokenResp, nil
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}
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// RefreshToken 刷新 access_token
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func (c *Client) RefreshToken(ctx context.Context, refreshToken string) (*TokenResponse, error) {
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params := url.Values{}
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params.Set("client_id", ClientID)
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params.Set("client_secret", ClientSecret)
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params.Set("refresh_token", refreshToken)
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params.Set("grant_type", "refresh_token")
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, TokenURL, strings.NewReader(params.Encode()))
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if err != nil {
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return nil, fmt.Errorf("创建请求失败: %w", err)
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}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("token 刷新请求失败: %w", err)
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}
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defer func() { _ = resp.Body.Close() }()
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bodyBytes, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("读取响应失败: %w", err)
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}
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("token 刷新失败 (HTTP %d): %s", resp.StatusCode, string(bodyBytes))
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}
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var tokenResp TokenResponse
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if err := json.Unmarshal(bodyBytes, &tokenResp); err != nil {
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return nil, fmt.Errorf("token 解析失败: %w", err)
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}
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return &tokenResp, nil
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}
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// GetUserInfo 获取用户信息
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func (c *Client) GetUserInfo(ctx context.Context, accessToken string) (*UserInfo, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, UserInfoURL, nil)
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if err != nil {
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return nil, fmt.Errorf("创建请求失败: %w", err)
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}
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req.Header.Set("Authorization", "Bearer "+accessToken)
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("用户信息请求失败: %w", err)
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}
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defer func() { _ = resp.Body.Close() }()
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bodyBytes, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("读取响应失败: %w", err)
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}
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("获取用户信息失败 (HTTP %d): %s", resp.StatusCode, string(bodyBytes))
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}
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var userInfo UserInfo
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if err := json.Unmarshal(bodyBytes, &userInfo); err != nil {
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return nil, fmt.Errorf("用户信息解析失败: %w", err)
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}
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return &userInfo, nil
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}
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// LoadCodeAssist 获取账户信息，返回解析后的结构体和原始 JSON
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// 支持 URL fallback：sandbox → daily → prod
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func (c *Client) LoadCodeAssist(ctx context.Context, accessToken string) (*LoadCodeAssistResponse, map[string]any, error) {
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reqBody := LoadCodeAssistRequest{}
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reqBody.Metadata.IDEType = "ANTIGRAVITY"
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bodyBytes, err := json.Marshal(reqBody)
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if err != nil {
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return nil, nil, fmt.Errorf("序列化请求失败: %w", err)
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}
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// 固定顺序：prod -> daily
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availableURLs := BaseURLs
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var lastErr error
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for urlIdx, baseURL := range availableURLs {
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apiURL := baseURL + "/v1internal:loadCodeAssist"
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, apiURL, strings.NewReader(string(bodyBytes)))
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if err != nil {
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lastErr = fmt.Errorf("创建请求失败: %w", err)
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continue
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}
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req.Header.Set("Authorization", "Bearer "+accessToken)
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("User-Agent", UserAgent)
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resp, err := c.httpClient.Do(req)
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if err != nil {
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lastErr = fmt.Errorf("loadCodeAssist 请求失败: %w", err)
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if shouldFallbackToNextURL(err, 0) && urlIdx < len(availableURLs)-1 {
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log.Printf("[antigravity] loadCodeAssist URL fallback: %s -> %s", baseURL, availableURLs[urlIdx+1])
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continue
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}
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return nil, nil, lastErr
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}
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respBodyBytes, err := io.ReadAll(resp.Body)
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_ = resp.Body.Close() // 立即关闭，避免循环内 defer 导致的资源泄漏
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if err != nil {
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return nil, nil, fmt.Errorf("读取响应失败: %w", err)
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}
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// 检查是否需要 URL 降级
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if shouldFallbackToNextURL(nil, resp.StatusCode) && urlIdx < len(availableURLs)-1 {
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log.Printf("[antigravity] loadCodeAssist URL fallback (HTTP %d): %s -> %s", resp.StatusCode, baseURL, availableURLs[urlIdx+1])
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continue
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}
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if resp.StatusCode != http.StatusOK {
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return nil, nil, fmt.Errorf("loadCodeAssist 失败 (HTTP %d): %s", resp.StatusCode, string(respBodyBytes))
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}
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var loadResp LoadCodeAssistResponse
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if err := json.Unmarshal(respBodyBytes, &loadResp); err != nil {
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return nil, nil, fmt.Errorf("响应解析失败: %w", err)
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}
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// 解析原始 JSON 为 map
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var rawResp map[string]any
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_ = json.Unmarshal(respBodyBytes, &rawResp)
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// 标记成功的 URL，下次优先使用
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DefaultURLAvailability.MarkSuccess(baseURL)
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return &loadResp, rawResp, nil
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}
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return nil, nil, lastErr
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}
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// ModelQuotaInfo 模型配额信息
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type ModelQuotaInfo struct {
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RemainingFraction float64 `json:"remainingFraction"`
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ResetTime string `json:"resetTime,omitempty"`
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}
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// ModelInfo 模型信息
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type ModelInfo struct {
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QuotaInfo *ModelQuotaInfo `json:"quotaInfo,omitempty"`
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}
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// FetchAvailableModelsRequest fetchAvailableModels 请求
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type FetchAvailableModelsRequest struct {
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Project string `json:"project"`
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}
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// FetchAvailableModelsResponse fetchAvailableModels 响应
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type FetchAvailableModelsResponse struct {
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Models map[string]ModelInfo `json:"models"`
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}
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// FetchAvailableModels 获取可用模型和配额信息，返回解析后的结构体和原始 JSON
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// 支持 URL fallback：sandbox → daily → prod
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func (c *Client) FetchAvailableModels(ctx context.Context, accessToken, projectID string) (*FetchAvailableModelsResponse, map[string]any, error) {
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reqBody := FetchAvailableModelsRequest{Project: projectID}
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bodyBytes, err := json.Marshal(reqBody)
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if err != nil {
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return nil, nil, fmt.Errorf("序列化请求失败: %w", err)
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}
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// 固定顺序：prod -> daily
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availableURLs := BaseURLs
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var lastErr error
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for urlIdx, baseURL := range availableURLs {
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apiURL := baseURL + "/v1internal:fetchAvailableModels"
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, apiURL, strings.NewReader(string(bodyBytes)))
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if err != nil {
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lastErr = fmt.Errorf("创建请求失败: %w", err)
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continue
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}
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req.Header.Set("Authorization", "Bearer "+accessToken)
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("User-Agent", UserAgent)
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resp, err := c.httpClient.Do(req)
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if err != nil {
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lastErr = fmt.Errorf("fetchAvailableModels 请求失败: %w", err)
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if shouldFallbackToNextURL(err, 0) && urlIdx < len(availableURLs)-1 {
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log.Printf("[antigravity] fetchAvailableModels URL fallback: %s -> %s", baseURL, availableURLs[urlIdx+1])
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continue
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}
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return nil, nil, lastErr
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}
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respBodyBytes, err := io.ReadAll(resp.Body)
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_ = resp.Body.Close() // 立即关闭，避免循环内 defer 导致的资源泄漏
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if err != nil {
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return nil, nil, fmt.Errorf("读取响应失败: %w", err)
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}
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// 检查是否需要 URL 降级
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if shouldFallbackToNextURL(nil, resp.StatusCode) && urlIdx < len(availableURLs)-1 {
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log.Printf("[antigravity] fetchAvailableModels URL fallback (HTTP %d): %s -> %s", resp.StatusCode, baseURL, availableURLs[urlIdx+1])
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continue
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}
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if resp.StatusCode != http.StatusOK {
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return nil, nil, fmt.Errorf("fetchAvailableModels 失败 (HTTP %d): %s", resp.StatusCode, string(respBodyBytes))
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}
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var modelsResp FetchAvailableModelsResponse
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if err := json.Unmarshal(respBodyBytes, &modelsResp); err != nil {
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return nil, nil, fmt.Errorf("响应解析失败: %w", err)
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}
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// 解析原始 JSON 为 map
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var rawResp map[string]any
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_ = json.Unmarshal(respBodyBytes, &rawResp)
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// 标记成功的 URL，下次优先使用
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DefaultURLAvailability.MarkSuccess(baseURL)
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return &modelsResp, rawResp, nil
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}
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return nil, nil, lastErr
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}
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