AI Gateway Go 0.10.0 源码快照 + 旗舰版需求规划报告

M0-M7 已完成:核心网关(身份/RBAC/TOTP/OIDC/SAML/Provider/配额/路由/内容策略/审计/定价)+ 资源市场(MCP/Skills/数字员工)。
含 22 个 PostgreSQL 迁移、管理端/门户端前端源码、OpenAPI 契约、部署 compose。

Co-Authored-By: Claude <noreply@anthropic.com>

internal/gateway/routing.go

@@ -0,0 +1,76 @@
+package gateway
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+)
+
+type ModelRouteQuery struct {
+	ProviderCode string
+	Model        string
+	Endpoint     string
+	APIKeyID     string
+	TenantID     string
+	Seed         string
+}
+
+type ModelRouteResult struct {
+	ResolvedAdapter
+	TargetModel string
+	Matched     bool
+	Known       bool
+}
+
+type ModelRouteResolver interface {
+	ModelRoutingEnabled() bool
+	ResolveModelRoute(ModelRouteQuery) (ModelRouteResult, error)
+}
+
+type modelRequest struct {
+	body  map[string]json.RawMessage
+	model string
+}
+
+func readModelRequest(request *http.Request, maxBody int64) (modelRequest, error) {
+	if request.Body == nil || request.Method == http.MethodGet {
+		return modelRequest{}, nil
+	}
+	body, err := io.ReadAll(io.LimitReader(request.Body, maxBody+1))
+	if err != nil {
+		return modelRequest{}, err
+	}
+	_ = request.Body.Close()
+	if int64(len(body)) > maxBody {
+		return modelRequest{}, errRequestBodyTooLarge
+	}
+	restoreRequestBody(request, body)
+	var payload map[string]json.RawMessage
+	if json.Unmarshal(body, &payload) != nil {
+		return modelRequest{}, nil
+	}
+	var model string
+	_ = json.Unmarshal(payload["model"], &model)
+	return modelRequest{body: payload, model: model}, nil
+}
+
+func (m modelRequest) rewrite(request *http.Request, target string) error {
+	if len(m.body) == 0 || target == "" || target == m.model {
+		return nil
+	}
+	encodedModel, _ := json.Marshal(target)
+	m.body["model"] = encodedModel
+	body, err := json.Marshal(m.body)
+	if err != nil {
+		return err
+	}
+	restoreRequestBody(request, body)
+	return nil
+}
+
+func restoreRequestBody(request *http.Request, body []byte) {
+	request.Body = io.NopCloser(bytes.NewReader(body))
+	request.ContentLength = int64(len(body))
+	request.GetBody = func() (io.ReadCloser, error) { return io.NopCloser(bytes.NewReader(body)), nil }
+}