5862e2d8d9
Real Claude Code CLI always sends a 2-block system array:
[0] {"type":"text", "text":"x-anthropic-billing-header: cc_version=X.Y.Z.{fp}; cc_entrypoint=cli; cch=00000;"}
[1] {"type":"text", "text":"You are Claude Code...", "cache_control":{...}}
Before this commit, sub2api's mimicry path only produced block [1].
The missing billing block is one of the primary third-party detection
signals Anthropic uses for Claude-Code-scoped OAuth tokens.
New file gateway_billing_block.go ports the fingerprint algorithm
(byte-for-byte from Parrot cc_mimicry.py:compute_fingerprint):
pick chars at positions [4,7,20] of the first user text, then
`sha256(SALT + chars + cc_version)[:3]`.
- claude/constants.go: CLICurrentVersion = "2.1.92" (must match UA)
- gateway_billing_block.go: computeClaudeCodeFingerprint +
buildBillingAttributionBlockJSON + extractFirstUserText
- gateway_service.go: rewriteSystemForNonClaudeCode now emits both
blocks in order; cch=00000 is filled in later by
signBillingHeaderCCH in buildUpstreamRequest.
Downstream compat note: syncBillingHeaderVersion's regex
`cc_version=\d+\.\d+\.\d+` only matches the semver triple,
leaving the `.{fp}` suffix intact when rewriting in buildUpstreamRequest.
204 lines
7.8 KiB
Go
204 lines
7.8 KiB
Go
// Package claude provides constants and helpers for Claude API integration.
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package claude
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// Claude Code 客户端相关常量
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// Beta header 常量
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//
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// 这里的常量对齐真实 Claude Code CLI 的最新流量（截至 2026-04）。
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// 选型参考：与 Parrot (src/transform/cc_mimicry.py) 的 BETAS 保持一致，
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// 原因：Anthropic 上游会基于 anthropic-beta 的完整集合判定请求来源；
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// 缺少任何"官方 Claude Code 请求才会带"的 beta，都会被降级到第三方额度，
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// 对应报错：`Third-party apps now draw from your extra usage, not your plan limits.`
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const (
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BetaOAuth = "oauth-2025-04-20"
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BetaClaudeCode = "claude-code-20250219"
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BetaInterleavedThinking = "interleaved-thinking-2025-05-14"
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BetaFineGrainedToolStreaming = "fine-grained-tool-streaming-2025-05-14"
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BetaTokenCounting = "token-counting-2024-11-01"
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BetaContext1M = "context-1m-2025-08-07"
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BetaFastMode = "fast-mode-2026-02-01"
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// 新增（对齐官方 CLI 2.1.9x 以来的流量）
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BetaPromptCachingScope = "prompt-caching-scope-2026-01-05"
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BetaEffort = "effort-2025-11-24"
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BetaRedactThinking = "redact-thinking-2026-02-12"
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BetaContextManagement = "context-management-2025-06-27"
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BetaExtendedCacheTTL = "extended-cache-ttl-2025-04-11"
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)
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// DroppedBetas 是转发时需要从 anthropic-beta header 中移除的 beta token 列表。
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// 这些 token 是客户端特有的，不应透传给上游 API。
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var DroppedBetas = []string{}
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// DefaultBetaHeader Claude Code 客户端默认的 anthropic-beta header
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const DefaultBetaHeader = BetaClaudeCode + "," + BetaOAuth + "," + BetaInterleavedThinking + "," + BetaFineGrainedToolStreaming
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// MessageBetaHeaderNoTools /v1/messages 在无工具时的 beta header
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//
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// NOTE: Claude Code OAuth credentials are scoped to Claude Code. When we "mimic"
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// Claude Code for non-Claude-Code clients, we must include the claude-code beta
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// even if the request doesn't use tools, otherwise upstream may reject the
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// request as a non-Claude-Code API request.
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const MessageBetaHeaderNoTools = BetaClaudeCode + "," + BetaOAuth + "," + BetaInterleavedThinking
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// MessageBetaHeaderWithTools /v1/messages 在有工具时的 beta header
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const MessageBetaHeaderWithTools = BetaClaudeCode + "," + BetaOAuth + "," + BetaInterleavedThinking
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// CountTokensBetaHeader count_tokens 请求使用的 anthropic-beta header
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const CountTokensBetaHeader = BetaClaudeCode + "," + BetaOAuth + "," + BetaInterleavedThinking + "," + BetaTokenCounting
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// HaikuBetaHeader Haiku 模型使用的 anthropic-beta header（不需要 claude-code beta）
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const HaikuBetaHeader = BetaOAuth + "," + BetaInterleavedThinking
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// APIKeyBetaHeader API-key 账号建议使用的 anthropic-beta header（不包含 oauth）
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const APIKeyBetaHeader = BetaClaudeCode + "," + BetaInterleavedThinking + "," + BetaFineGrainedToolStreaming
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// APIKeyHaikuBetaHeader Haiku 模型在 API-key 账号下使用的 anthropic-beta header（不包含 oauth / claude-code）
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const APIKeyHaikuBetaHeader = BetaInterleavedThinking
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// DefaultCacheControlTTL 是网关代理为自己生成的 cache_control 块默认使用的 ttl。
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// 真实 Claude Code CLI 当前使用 "1h"，但本仓策略是"客户端透传 ttl 优先；
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// 客户端缺省时统一使用 5m"，这样既不浪费 1h 缓存额度，也保留客户端自定义能力。
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const DefaultCacheControlTTL = "5m"
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// CLICurrentVersion 是 sub2api 当前对外伪装的 Claude Code CLI 版本号（三段 semver）。
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// 用于 billing attribution block 中的 cc_version=X.Y.Z.{fp} 前缀以及 fingerprint 计算。
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// 必须与 DefaultHeaders["User-Agent"] 中的版本号严格一致；不一致会被 Anthropic 判第三方。
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const CLICurrentVersion = "2.1.92"
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// FullClaudeCodeMimicryBetas 返回最"像"真实 Claude Code CLI 的完整 beta 列表，
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// 用于 OAuth 账号伪装成 Claude Code 时使用。
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// 顺序与真实 CLI 抓包一致。
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//
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// 使用建议：
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// - OAuth 账号 + 非 haiku：追加这整份列表，再按需保留 client 带来的 beta。
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// - OAuth 账号 + haiku：Anthropic 对 haiku 不做 third-party 判定，使用 HaikuBetaHeader 即可。
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// - API-key 账号：不要使用本函数，参见 APIKeyBetaHeader。
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func FullClaudeCodeMimicryBetas() []string {
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return []string{
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BetaClaudeCode,
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BetaOAuth,
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BetaInterleavedThinking,
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BetaPromptCachingScope,
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BetaEffort,
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BetaRedactThinking,
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BetaContextManagement,
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BetaExtendedCacheTTL,
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}
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}
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// DefaultHeaders 是 Claude Code 客户端默认请求头。
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var DefaultHeaders = map[string]string{
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// Keep these in sync with recent Claude CLI traffic to reduce the chance
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// that Claude Code-scoped OAuth credentials are rejected as "non-CLI" usage.
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// 版本参考：对齐 Parrot (src/transform/cc_mimicry.py:49) 的 CLI_USER_AGENT。
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"User-Agent": "claude-cli/2.1.92 (external, cli)",
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"X-Stainless-Lang": "js",
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"X-Stainless-Package-Version": "0.70.0",
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"X-Stainless-OS": "Linux",
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"X-Stainless-Arch": "arm64",
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"X-Stainless-Runtime": "node",
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"X-Stainless-Runtime-Version": "v24.13.0",
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"X-Stainless-Retry-Count": "0",
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"X-Stainless-Timeout": "600",
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"X-App": "cli",
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"Anthropic-Dangerous-Direct-Browser-Access": "true",
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}
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// Model 表示一个 Claude 模型
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type Model struct {
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ID string `json:"id"`
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Type string `json:"type"`
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DisplayName string `json:"display_name"`
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CreatedAt string `json:"created_at"`
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}
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// DefaultModels Claude Code 客户端支持的默认模型列表
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var DefaultModels = []Model{
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{
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ID: "claude-opus-4-5-20251101",
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Type: "model",
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DisplayName: "Claude Opus 4.5",
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CreatedAt: "2025-11-01T00:00:00Z",
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},
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{
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ID: "claude-opus-4-6",
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Type: "model",
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DisplayName: "Claude Opus 4.6",
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CreatedAt: "2026-02-06T00:00:00Z",
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},
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{
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ID: "claude-opus-4-7",
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Type: "model",
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DisplayName: "Claude Opus 4.7",
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CreatedAt: "2026-04-17T00:00:00Z",
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},
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{
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ID: "claude-sonnet-4-6",
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Type: "model",
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DisplayName: "Claude Sonnet 4.6",
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CreatedAt: "2026-02-18T00:00:00Z",
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},
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{
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ID: "claude-sonnet-4-5-20250929",
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Type: "model",
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DisplayName: "Claude Sonnet 4.5",
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CreatedAt: "2025-09-29T00:00:00Z",
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},
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{
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ID: "claude-haiku-4-5-20251001",
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Type: "model",
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DisplayName: "Claude Haiku 4.5",
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CreatedAt: "2025-10-01T00:00:00Z",
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},
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}
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// DefaultModelIDs 返回默认模型的 ID 列表
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func DefaultModelIDs() []string {
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ids := make([]string, len(DefaultModels))
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for i, m := range DefaultModels {
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ids[i] = m.ID
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}
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return ids
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}
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// DefaultTestModel 测试时使用的默认模型
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const DefaultTestModel = "claude-sonnet-4-5-20250929"
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// ModelIDOverrides Claude OAuth 请求需要的模型 ID 映射
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var ModelIDOverrides = map[string]string{
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"claude-sonnet-4-5": "claude-sonnet-4-5-20250929",
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"claude-opus-4-5": "claude-opus-4-5-20251101",
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"claude-haiku-4-5": "claude-haiku-4-5-20251001",
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}
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// ModelIDReverseOverrides 用于将上游模型 ID 还原为短名
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var ModelIDReverseOverrides = map[string]string{
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"claude-sonnet-4-5-20250929": "claude-sonnet-4-5",
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"claude-opus-4-5-20251101": "claude-opus-4-5",
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"claude-haiku-4-5-20251001": "claude-haiku-4-5",
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}
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// NormalizeModelID 根据 Claude OAuth 规则映射模型
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func NormalizeModelID(id string) string {
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if id == "" {
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return id
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}
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if mapped, ok := ModelIDOverrides[id]; ok {
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return mapped
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}
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return id
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}
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// DenormalizeModelID 将上游模型 ID 转换为短名
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func DenormalizeModelID(id string) string {
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if id == "" {
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return id
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}
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if mapped, ok := ModelIDReverseOverrides[id]; ok {
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return mapped
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}
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return id
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}
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