SakurasanandClaude
4d4d09ba58
- 候选渠道携带 upstream_model, prepareUpstream 改写请求体 model 字段为上游名 - 新增渠道视角绑定 CRUD: GET/POST/PATCH/DELETE /admin/channels/:id/models - 前端渠道页新增"模型映射": 列出绑定、内联改上游名、解除、添加 - rewriteModel 三种协议通用(model 均在顶层) Co-Authored-By: Claude <noreply@anthropic.com>
257 lines
8.0 KiB
Go
257 lines
8.0 KiB
Go
// Package proxy API 网关核心：代理 /v1/chat/completions、/v1/responses、/v1/messages、/v1/models。
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// M1 直通 OpenAI 渠道；M4 起按客户端协议 × 渠道协议自动转换（见 convert）。
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package proxy
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"strings"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/openteam/server/internal/channel"
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"github.com/openteam/server/internal/pkg/apikey"
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"github.com/openteam/server/internal/pkg/crypto"
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"github.com/openteam/server/internal/pkg/ratelimit"
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"github.com/openteam/server/internal/proxy/convert"
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"github.com/openteam/server/internal/store"
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"github.com/openteam/server/internal/usage"
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"gorm.io/gorm"
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)
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const (
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CtxUserID = "proxy_user_id"
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CtxKeyID = "proxy_key_id"
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CtxTrace = "proxy_trace_id"
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)
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type Gateway struct {
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db *gorm.DB
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ch *channel.Service
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rec *usage.Recorder
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enc *crypto.Encryptor
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lim *ratelimit.Limiter
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userRPS int
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hc *http.Client
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}
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func NewGateway(db *gorm.DB, enc *crypto.Encryptor, rec *usage.Recorder, lim *ratelimit.Limiter, userRPS int) *Gateway {
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return &Gateway{
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db: db,
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ch: channel.NewService(db, enc),
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rec: rec,
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enc: enc,
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lim: lim,
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userRPS: userRPS,
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hc: &http.Client{Timeout: 120 * time.Second},
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}
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}
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// Auth 代理鉴权中间件：Bearer sk-xxx → 哈希查表 → 校验状态/过期/模型白名单。
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func (g *Gateway) Auth(c *gin.Context) {
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// 先按路径确定客户端协议，保证 Auth 阶段错误也按协议格式返回
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switch c.Request.URL.Path {
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case "/v1/messages":
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c.Set("protocol", convert.ProtoMessages)
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case "/v1/responses":
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c.Set("protocol", convert.ProtoResponses)
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default:
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c.Set("protocol", convert.ProtoChat)
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}
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auth := c.GetHeader("Authorization")
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key := strings.TrimPrefix(auth, "Bearer ")
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key = strings.TrimSpace(key)
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if !apikey.Valid(key) {
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apiError(c, http.StatusUnauthorized, "invalid_api_key", "Invalid API key format. Expected: Bearer sk-...")
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c.Abort()
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return
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}
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hash := apikey.Hash(key)
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var k store.APIKey
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if err := g.db.Where("key_hash = ? AND status = ?", hash, store.KeyStatusActive).First(&k).Error; err != nil {
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apiError(c, http.StatusUnauthorized, "invalid_api_key", "Invalid API key")
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c.Abort()
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return
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}
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var u store.User
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if err := g.db.First(&u, k.UserID).Error; err != nil || u.Status != store.UserStatusActive {
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apiError(c, http.StatusForbidden, "user_disabled", "User account is disabled")
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c.Abort()
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return
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}
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if k.ExpiresAt != nil && time.Now().After(*k.ExpiresAt) {
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apiError(c, http.StatusUnauthorized, "key_expired", "API key has expired")
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c.Abort()
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return
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}
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// 限流与配额（内存计数）
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if g.lim != nil {
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if k.QuotaRequestsPerDay != nil && !g.lim.AllowRequestDaily(k.ID, *k.QuotaRequestsPerDay) {
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apiError(c, http.StatusTooManyRequests, "rate_limit_exceeded", "Daily request quota exceeded for this API key")
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c.Abort()
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return
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}
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if k.QuotaTokensPerDay != nil && g.lim.TokensUsed(k.ID) >= *k.QuotaTokensPerDay {
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apiError(c, http.StatusTooManyRequests, "rate_limit_exceeded", "Daily token quota exceeded for this API key")
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c.Abort()
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return
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}
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if !g.lim.AllowUserRate(u.ID, g.userRPS) {
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apiError(c, http.StatusTooManyRequests, "rate_limit_exceeded", "Too many requests. Please slow down.")
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c.Abort()
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return
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}
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}
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c.Set(CtxUserID, u.ID)
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c.Set(CtxKeyID, k.ID)
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c.Set(CtxTrace, newTraceID())
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g.db.Model(&store.APIKey{}).Where("id = ?", k.ID).Update("last_used_at", time.Now())
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c.Next()
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}
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// Handle 路由到对应协议处理器。
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func (g *Gateway) Handle(c *gin.Context) {
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switch {
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case c.Request.URL.Path == "/v1/chat/completions":
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g.chatCompletions(c)
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case c.Request.URL.Path == "/v1/responses":
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g.responses(c)
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case c.Request.URL.Path == "/v1/messages":
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g.messages(c)
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case c.Request.URL.Path == "/v1/models" && c.Request.Method == http.MethodGet:
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g.models(c)
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default:
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apiError(c, http.StatusNotFound, "not_found", "Unknown endpoint: "+c.Request.URL.Path)
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}
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}
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// models GET /v1/models：返回启用的全局模型（OpenAI 风格）。
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func (g *Gateway) models(c *gin.Context) {
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var ms []store.Model
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if err := g.db.Where("enabled = ?", true).Order("sort ASC, id ASC").Find(&ms).Error; err != nil {
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apiError(c, http.StatusInternalServerError, "internal_error", "failed to load models")
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return
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}
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data := make([]gin.H, 0, len(ms))
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for _, m := range ms {
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data = append(data, gin.H{
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"id": m.Name,
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"object": "model",
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"created": m.CreatedAt.Unix(),
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"owned_by": "openteam",
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})
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}
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c.JSON(http.StatusOK, gin.H{"object": "list", "data": data})
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}
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// candidateChannels 返回可用渠道候选（按模型绑定优先，退化全局；携带模型映射）。
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func (g *Gateway) candidateChannels(model string) []channel.Candidate {
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return g.ch.Candidates(model)
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}
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// resolveUser 取当前用户（含余额）。
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func (g *Gateway) resolveUser(c *gin.Context) (*store.User, bool) {
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uid, _ := c.Get(CtxUserID)
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var u store.User
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if err := g.db.First(&u, uid).Error; err != nil {
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apiError(c, http.StatusUnauthorized, "invalid_api_key", "Invalid API key")
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return nil, false
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}
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return &u, true
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}
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// checkBalance 余额不足返回 402（PLANNING §4.4.3）。
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func (g *Gateway) checkBalance(c *gin.Context, u *store.User) bool {
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if u.Balance <= 0 {
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apiError(c, http.StatusPaymentRequired, "insufficient_balance", "Insufficient balance. Please recharge or contact admin.")
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return false
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}
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return true
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}
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// ---------------------------------------------------------------------------
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// 协议分派
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func upstreamPath(proto string) string {
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switch proto {
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case convert.ProtoMessages:
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return "/v1/messages"
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case convert.ProtoResponses:
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return "/v1/responses"
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default:
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return "/v1/chat/completions"
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}
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}
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// upstreamPlan 描述一次代理请求的上游访问方式。
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type upstreamPlan struct {
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path string // 上游路径
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body []byte // 已转换的请求体
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lineConv func([]byte) []byte // 流式逐行转换（nil=直通）
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bodyConv func([]byte) ([]byte, error) // 非流式响应体转换（nil=直通）
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}
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// conversionTarget 决定客户端协议在渠道上的处理方式：
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// 渠道声明支持该协议则直通（返回原协议）；否则转为其首选支持协议（chat > messages > responses）。
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func conversionTarget(formats []string, clientProto string) string {
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for _, f := range formats {
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if f == clientProto {
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return clientProto
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}
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}
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for _, p := range []string{convert.ProtoChat, convert.ProtoMessages, convert.ProtoResponses} {
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for _, f := range formats {
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if f == p {
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return p
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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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// prepareUpstream 计算上游访问计划：渠道声明支持客户端协议则直通，否则转换；
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// 应用模型名称映射（upstream_model）。
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func prepareUpstream(ch *store.Channel, clientProto string, body []byte, upstreamModel string) (*upstreamPlan, error) {
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target := conversionTarget(ch.FormatsEffective(), clientProto)
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if target == "" {
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return nil, fmt.Errorf("channel %q declares no supported protocol format", ch.Name)
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}
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plan := &upstreamPlan{path: upstreamPath(target), body: body}
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if target != clientProto {
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converted, err := convert.ConvertRequest(body, clientProto, target)
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if err != nil {
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return nil, err
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}
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plan.body = converted
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plan.lineConv = convert.NewStreamTransformer(target, clientProto)
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plan.bodyConv = func(b []byte) ([]byte, error) { return convert.ConvertResponse(b, target, clientProto) }
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}
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// 模型名称映射：把请求体 model 字段改写为渠道侧的 upstream_model
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if upstreamModel != "" {
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if out, err := rewriteModel(plan.body, upstreamModel); err == nil {
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plan.body = out
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}
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}
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return plan, nil
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}
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// rewriteModel 改写请求体中的 model 字段（三种协议 model 都在顶层）。
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func rewriteModel(body []byte, model string) ([]byte, error) {
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var m map[string]any
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if err := json.Unmarshal(body, &m); err != nil {
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return body, nil
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}
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if cur, _ := m["model"].(string); cur == model {
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return body, nil
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}
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m["model"] = model
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return json.Marshal(m)
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}
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var errNoChannel = errors.New("no available channel")
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