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192 lines
11 KiB
Go
192 lines
11 KiB
Go
package service
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import (
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"fmt"
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"net/http"
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"github.com/Wei-Shaw/sub2api/internal/config"
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"github.com/Wei-Shaw/sub2api/internal/pkg/openai"
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"github.com/gin-gonic/gin"
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)
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// CodexOfficialClientsOnlyMessage 是 codex_cli_only 拒绝时面向客户端的通用兜底文案。
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// 仅当拒绝原因不是「可解析版本但越界」(VersionTooLow/VersionTooHigh)时使用:
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// 未命中官方/黑名单/缺指纹/版本无法识别都沿用这句(避免向伪装客户端泄露门控细节)。
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const CodexOfficialClientsOnlyMessage = "This account only allows Codex official clients"
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const (
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// CodexClientRestrictionReasonDisabled 表示账号未开启 codex_cli_only。
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CodexClientRestrictionReasonDisabled = "codex_cli_only_disabled"
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// CodexClientRestrictionReasonMatchedUA 表示请求命中官方客户端 UA 白名单。
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CodexClientRestrictionReasonMatchedUA = "official_client_user_agent_matched"
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// CodexClientRestrictionReasonMatchedOriginator 表示请求命中官方客户端 originator 白名单。
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CodexClientRestrictionReasonMatchedOriginator = "official_client_originator_matched"
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// CodexClientRestrictionReasonNotMatchedUA 表示请求未命中任何允许的客户端身份。
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CodexClientRestrictionReasonNotMatchedUA = "official_client_user_agent_not_matched"
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// CodexClientRestrictionReasonForceCodexCLI 表示通过 ForceCodexCLI 配置兜底放行。
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CodexClientRestrictionReasonForceCodexCLI = "force_codex_cli_enabled"
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// CodexClientRestrictionReasonBlacklisted 表示请求命中全局黑名单(门内 deny 最先,OR 语义)。
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CodexClientRestrictionReasonBlacklisted = "blacklist_matched"
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// CodexClientRestrictionReasonMatchedWhitelistClient 表示请求命中全局自由白名单条目(双因子 AND)。
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CodexClientRestrictionReasonMatchedWhitelistClient = "whitelist_client_matched"
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// CodexClientRestrictionReasonVersionTooLow 表示 UA 解析出的 Codex 引擎版本低于最低要求。
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CodexClientRestrictionReasonVersionTooLow = "codex_version_too_low"
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// CodexClientRestrictionReasonMissingEngineFingerprint 表示 strict 指纹门下缺少 codex 引擎指纹头。
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CodexClientRestrictionReasonMissingEngineFingerprint = "missing_engine_fingerprint"
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// CodexClientRestrictionReasonVersionUndetectable 表示 codex_cli_only 下无法从 UA 解析出 Codex 引擎版本。
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CodexClientRestrictionReasonVersionUndetectable = "codex_version_undetectable"
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// CodexClientRestrictionReasonVersionTooHigh 表示 UA 解析出的 Codex 引擎版本高于最高允许版本。
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CodexClientRestrictionReasonVersionTooHigh = "codex_version_too_high"
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// CodexClientRestrictionReasonMatchedAppServerClient 表示 App Server 开关开启时对未列名客户端开闸放行(仍过引擎门)。
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CodexClientRestrictionReasonMatchedAppServerClient = "app_server_client_matched"
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)
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// CodexRestrictionPolicy 是 codex_cli_only 判定所需的全局策略快照,由调用方从全局设置解析注入(global-only)。
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// 账号侧只有 codex_cli_only 开关本身;黑/白名单、最低版本、指纹门均为全局设置。
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type CodexRestrictionPolicy struct {
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Whitelist []openai.AllowedClientEntry // 全局自由白名单(双因子 AND,放行官方集未覆盖的 app-server client)
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Blacklist []openai.AllowedClientEntry // 全局自由黑名单(OR,宽 deny)
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MinCodexVersion string // 最低 Codex 引擎版本 semver;""=不校验
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MaxCodexVersion string // 最高 Codex 引擎版本 semver;""=不校验
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AllowAppServerClients bool // App Server 开关:对未列名客户端开闸(仍受引擎门约束)
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EngineFingerprintSignals []openai.EngineFingerprintSignal // 引擎指纹门信号列表(勾选 AND / 行内变体 OR);缺省=默认种子(只勾 x-codex-)
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}
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// CodexClientRestrictionDetectionResult 是 codex_cli_only 统一检测入口结果。
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type CodexClientRestrictionDetectionResult struct {
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Enabled bool
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Matched bool
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Reason string
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// DetectedVersion 是从官方 UA 解析出的 Codex 引擎版本;仅在版本门拒绝
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// (VersionTooLow / VersionTooHigh) 时填充,供面向客户端的差异化文案使用。
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DetectedVersion string
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// MinCodexVersion 是触发 VersionTooLow 时的最低要求版本(来自策略快照)。
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MinCodexVersion string
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// MaxCodexVersion 是触发 VersionTooHigh 时的最高允许版本(来自策略快照)。
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MaxCodexVersion string
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}
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// CodexClientRestrictionDetector 定义 codex_cli_only 统一检测入口。
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type CodexClientRestrictionDetector interface {
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Detect(c *gin.Context, account *Account, policy CodexRestrictionPolicy, body []byte) CodexClientRestrictionDetectionResult
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}
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// OpenAICodexClientRestrictionDetector 为 OpenAI OAuth codex_cli_only 的默认实现。
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type OpenAICodexClientRestrictionDetector struct {
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cfg *config.Config
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}
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func NewOpenAICodexClientRestrictionDetector(cfg *config.Config) *OpenAICodexClientRestrictionDetector {
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return &OpenAICodexClientRestrictionDetector{cfg: cfg}
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}
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// Detect 门控顺序(每步可短路):
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// 1. 账号未开 codex_cli_only → 不限制(Disabled)。
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// 2. gateway.force_codex_cli → 全局旁路放行(ForceCodexCLI)。
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// 3. 黑名单命中 → 立即拒(门内 deny 最先,OR 语义)。
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// 4. 身份候选:官方 UA / 官方 originator / 全局白名单 / App Server 开闸(全局开关 OR 账号开关);都不命中 → 拒(NotMatchedUA)。
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// 5. Codex 版本(仅官方候选):版本必须可解析(否则 VersionUndetectable);< Min → 拒(TooLow);> Max → 拒(TooHigh)。
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// 6. 引擎指纹 AND 硬门:按 EngineFingerprintSignals 列表勾选 AND 判定(无任何 Required 信号→放行,即「关闭指纹门」=取消所有勾选);白名单条目可显式 skip。
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func (d *OpenAICodexClientRestrictionDetector) Detect(c *gin.Context, account *Account, policy CodexRestrictionPolicy, body []byte) CodexClientRestrictionDetectionResult {
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if account == nil || !account.IsCodexCLIOnlyEnabled() {
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return CodexClientRestrictionDetectionResult{Enabled: false, Matched: false, Reason: CodexClientRestrictionReasonDisabled}
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}
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if d != nil && d.cfg != nil && d.cfg.Gateway.ForceCodexCLI {
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return CodexClientRestrictionDetectionResult{Enabled: true, Matched: true, Reason: CodexClientRestrictionReasonForceCodexCLI}
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}
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userAgent := ""
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originator := ""
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var header http.Header
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if c != nil {
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userAgent = c.GetHeader("User-Agent")
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originator = c.GetHeader("originator")
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if c.Request != nil {
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header = c.Request.Header
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}
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}
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// 3. 黑名单优先(门内 deny 最先,OR:任一已声明字段命中即拒)。
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if openai.MatchDenyEntries(userAgent, originator, policy.Blacklist) {
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return CodexClientRestrictionDetectionResult{Enabled: true, Matched: false, Reason: CodexClientRestrictionReasonBlacklisted}
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}
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// 4. 身份候选(优先级:官方 > 全局白名单 > App Server 开闸:全局开关 OR 账号开关)。
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reason := ""
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skipFingerprint := false
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switch {
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case openai.IsCodexOfficialClientRequestStrict(userAgent):
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reason = CodexClientRestrictionReasonMatchedUA
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case openai.IsCodexOfficialClientOriginator(originator):
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reason = CodexClientRestrictionReasonMatchedOriginator
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default:
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if entry, ok := openai.MatchClientEntry(userAgent, originator, policy.Whitelist); ok {
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reason = CodexClientRestrictionReasonMatchedWhitelistClient
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skipFingerprint = entry.SkipEngineFingerprint
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} else if policy.AllowAppServerClients || account.IsCodexCLIOnlyAppServerAllowed() {
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reason = CodexClientRestrictionReasonMatchedAppServerClient
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}
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}
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if reason == "" {
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return CodexClientRestrictionDetectionResult{Enabled: true, Matched: false, Reason: CodexClientRestrictionReasonNotMatchedUA}
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}
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// 5. Codex 版本:仅对官方候选(官方 UA / 官方 originator)。版本必须可识别(需求②),再校验 [min,max]。
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// 白名单/账号预设/App Server 候选可能不带可解析引擎版本,整块跳过。
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if reason == CodexClientRestrictionReasonMatchedUA || reason == CodexClientRestrictionReasonMatchedOriginator {
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ver, ok := openai.ParseCodexEngineVersion(userAgent)
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if !ok {
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return CodexClientRestrictionDetectionResult{Enabled: true, Matched: false, Reason: CodexClientRestrictionReasonVersionUndetectable}
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}
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if policy.MinCodexVersion != "" && CompareVersions(ver, policy.MinCodexVersion) < 0 {
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return CodexClientRestrictionDetectionResult{
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Enabled: true,
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Matched: false,
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Reason: CodexClientRestrictionReasonVersionTooLow,
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DetectedVersion: ver,
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MinCodexVersion: policy.MinCodexVersion,
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}
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}
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if policy.MaxCodexVersion != "" && CompareVersions(ver, policy.MaxCodexVersion) > 0 {
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return CodexClientRestrictionDetectionResult{
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Enabled: true,
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Matched: false,
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Reason: CodexClientRestrictionReasonVersionTooHigh,
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DetectedVersion: ver,
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MaxCodexVersion: policy.MaxCodexVersion,
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}
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}
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}
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// 6. 引擎指纹 AND 硬门。对所有候选生效;唯一例外:命中的白名单条目显式 SkipEngineFingerprint。
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// 按全局信号列表判定:所有勾选(Required)信号都命中即放行,每条命中任一变体即满足(行内 OR);
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// 无任何勾选信号 → 视为无要求放行(即「关闭指纹门」=取消所有勾选)。ForceCodexCLI 与黑名单不经此门。
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if !skipFingerprint {
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if !openai.EvaluateEngineFingerprint(header, body, policy.EngineFingerprintSignals) {
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return CodexClientRestrictionDetectionResult{Enabled: true, Matched: false, Reason: CodexClientRestrictionReasonMissingEngineFingerprint}
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}
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}
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return CodexClientRestrictionDetectionResult{Enabled: true, Matched: true, Reason: reason}
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}
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// CodexClientRestrictionMessage 把检测结果映射为面向客户端的 403 文案。
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// 仅版本越界(VersionTooLow/VersionTooHigh)给出带实际版本号与边界的差异化提示——
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// 这类请求其实已被识别为官方 Codex(命中官方 UA/originator),再回「只允许官方客户端」会误导;
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// 其余拒绝原因统一沿用通用兜底句,不暴露门控细节。
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func CodexClientRestrictionMessage(r CodexClientRestrictionDetectionResult) string {
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switch r.Reason {
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case CodexClientRestrictionReasonVersionTooLow:
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return fmt.Sprintf(
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"Your Codex version (%s) is below the minimum required version (%s). Please update Codex.",
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r.DetectedVersion, r.MinCodexVersion)
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case CodexClientRestrictionReasonVersionTooHigh:
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return fmt.Sprintf(
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"Your Codex version (%s) exceeds the maximum allowed version (%s). Please downgrade Codex to %s or lower.",
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r.DetectedVersion, r.MaxCodexVersion, r.MaxCodexVersion)
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default:
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return CodexOfficialClientsOnlyMessage
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}
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}
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