338 lines
11 KiB
Go
338 lines
11 KiB
Go
package httpkit
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import (
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"context"
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"encoding/json"
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"io"
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"net"
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"net/http"
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"net/netip"
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"strconv"
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"strings"
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"time"
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"google.golang.org/grpc/status"
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"hyapp/pkg/appcode"
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"hyapp/pkg/idgen"
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"hyapp/pkg/xerr"
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"hyapp/services/gateway-service/internal/auth"
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activityv1 "hyapp.local/api/proto/activity/v1"
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roomv1 "hyapp.local/api/proto/room/v1"
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userv1 "hyapp.local/api/proto/user/v1"
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)
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type requestIDContextKey struct{}
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const (
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CodeOK = "OK"
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CodeInvalidJSON = "INVALID_JSON"
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CodeInvalidArgument = "INVALID_ARGUMENT"
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CodeUnauthorized = "UNAUTHORIZED"
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CodePermissionDenied = "PERMISSION_DENIED"
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CodeProfileRequired = "PROFILE_REQUIRED"
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CodeAuthLoginBlocked = "AUTH_LOGIN_BLOCKED"
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CodeNotFound = "NOT_FOUND"
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CodeRateLimited = "RATE_LIMITED"
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CodeUpstreamError = "UPSTREAM_ERROR"
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CodeInternalError = "INTERNAL_ERROR"
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)
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// ResponseEnvelope 是 gateway 暴露给客户端的稳定 JSON 外壳。
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// HTTP status 表示传输层结果，code 表示客户端可依赖的错误语义。
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type ResponseEnvelope struct {
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Code string `json:"code"`
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Message string `json:"message"`
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RequestID string `json:"request_id"`
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Data any `json:"data,omitempty"`
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}
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// WithRequestID 为每个业务 API 请求建立服务端追踪 ID。
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// 入站 X-Request-ID 不作为可信输入，避免客户端把追踪字段误用成跨请求幂等锚点。
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func WithRequestID(next http.Handler) http.Handler {
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return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
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requestID := idgen.New("req")
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writer.Header().Set("X-Request-ID", requestID)
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ctx := context.WithValue(request.Context(), requestIDContextKey{}, requestID)
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next.ServeHTTP(writer, request.WithContext(ctx))
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})
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}
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// RequestIDFromContext 读取当前 HTTP 请求的追踪 ID。
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// 理论上业务路由都会先经过 WithRequestID；兜底生成值只用于防御错误调用。
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func RequestIDFromContext(ctx context.Context) string {
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requestID, _ := ctx.Value(requestIDContextKey{}).(string)
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if requestID != "" {
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return requestID
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}
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return idgen.New("req")
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}
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// DecodeJSON 隔离 JSON 解码细节，避免 handler 直接依赖 envelope 写法。
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func DecodeJSON(reader io.Reader, out any) error {
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return json.NewDecoder(reader).Decode(out)
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}
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// Decode 统一处理 HTTP JSON 入参解析失败分支。
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// gateway 在这里拒绝非法 JSON，不把脏请求继续透传到内部 gRPC。
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func Decode(writer http.ResponseWriter, request *http.Request, out any) bool {
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if err := DecodeJSON(request.Body, out); err != nil {
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WriteError(writer, request, http.StatusBadRequest, CodeInvalidJSON, "invalid request body")
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return false
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}
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return true
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}
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// WriteOK 写成功 envelope。
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func WriteOK(writer http.ResponseWriter, request *http.Request, data any) {
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WriteEnvelope(writer, http.StatusOK, ResponseEnvelope{
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Code: CodeOK,
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Message: "ok",
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RequestID: ResponseRequestID(request),
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Data: data,
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})
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}
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// WriteError 写失败 envelope。
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// 错误 message 保持稳定、短小，排障依赖 request_id 追日志，而不是把内部错误直接暴露给客户端。
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func WriteError(writer http.ResponseWriter, request *http.Request, statusCode int, code string, message string) {
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WriteEnvelope(writer, statusCode, ResponseEnvelope{
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Code: code,
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Message: message,
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RequestID: ResponseRequestID(request),
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})
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}
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// WriteRPCError 把内部 gRPC status + ErrorInfo.reason 转成外部稳定 envelope。
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func WriteRPCError(writer http.ResponseWriter, request *http.Request, err error) {
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if err == nil {
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return
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}
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if _, ok := status.FromError(err); !ok {
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WriteError(writer, request, http.StatusBadGateway, CodeUpstreamError, "upstream service error")
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return
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}
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reason := xerr.ReasonFromGRPC(err)
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statusCode, code, message := MapReasonToHTTP(reason)
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WriteError(writer, request, statusCode, code, message)
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}
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// Write 统一把内部 gRPC 调用结果转换为 HTTP JSON 响应。
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func Write(writer http.ResponseWriter, request *http.Request, body any, err error) {
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if err != nil {
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WriteRPCError(writer, request, err)
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return
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}
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WriteOK(writer, request, body)
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}
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func MapReasonToHTTP(reason xerr.Code) (int, string, string) {
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spec := xerr.SpecOf(reason)
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return spec.HTTPStatus, spec.PublicCode, spec.PublicMessage
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}
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// WriteEnvelope 是 gateway 业务 API 的唯一 JSON 响应出口。
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func WriteEnvelope(writer http.ResponseWriter, statusCode int, response ResponseEnvelope) {
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writer.Header().Set("Content-Type", "application/json")
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writer.WriteHeader(statusCode)
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if err := json.NewEncoder(writer).Encode(response); err != nil {
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return
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}
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}
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// ResponseRequestID 统一确定响应中的 request_id。
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func ResponseRequestID(request *http.Request) string {
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return RequestIDFromContext(request.Context())
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}
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// PositiveInt64PathValue 只接受 ServeMux 已命中的单段正整数路径变量。
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// 非法路径参数在 transport 层返回 4xx，避免把坏 ID 继续透传到内部 gRPC。
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func PositiveInt64PathValue(request *http.Request, name string) (int64, bool) {
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raw := strings.TrimSpace(request.PathValue(name))
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value, err := strconv.ParseInt(raw, 10, 64)
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return value, err == nil && value > 0
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}
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func UserIDString(userID int64) string {
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if userID > 0 {
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return strconv.FormatInt(userID, 10)
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}
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return ""
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}
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func PositiveInt32Query(request *http.Request, name string, fallback int32) (int32, bool) {
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raw := strings.TrimSpace(request.URL.Query().Get(name))
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if raw == "" {
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return fallback, true
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}
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value, err := strconv.ParseInt(raw, 10, 32)
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if err != nil || value <= 0 {
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return 0, false
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}
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return int32(value), true
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}
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func FirstQueryOrHeader(request *http.Request, queryKey string, headerNames ...string) string {
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if value := strings.TrimSpace(request.URL.Query().Get(queryKey)); value != "" {
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return value
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}
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return FirstHeader(request, headerNames...)
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}
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func FirstHeader(request *http.Request, headerNames ...string) string {
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for _, name := range headerNames {
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if value := strings.TrimSpace(request.Header.Get(name)); value != "" {
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return value
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}
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}
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return ""
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}
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// RequireMethod 在业务 handler 之前固定 HTTP method，避免 path-only mux 让错误 method 进入命令链路。
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func RequireMethod(method string, next http.HandlerFunc) http.HandlerFunc {
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return func(writer http.ResponseWriter, request *http.Request) {
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if request.Method != method {
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WriteError(writer, request, http.StatusMethodNotAllowed, CodeInvalidArgument, "invalid argument")
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return
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}
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next(writer, request)
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}
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}
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// RequireCompletedProfile 在 gateway 层执行外部准入门禁。
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// 这里故意不访问 user-service，依赖 access token 快照，避免所有高频房间入口同步打用户服务。
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func RequireCompletedProfile(next http.HandlerFunc) http.HandlerFunc {
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return func(writer http.ResponseWriter, request *http.Request) {
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if !auth.ProfileCompletedFromContext(request.Context()) {
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WriteError(writer, request, http.StatusForbidden, CodeProfileRequired, "profile required")
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return
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}
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next.ServeHTTP(writer, request)
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}
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}
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// RoomMeta 把外部 HTTP 请求上下文转换成 room-service 命令元信息。
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// request_id 只做链路追踪；command_id 必须来自客户端用户动作，gateway 只裁剪空白。
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func RoomMeta(request *http.Request, roomID string, commandID string) *roomv1.RequestMeta {
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return &roomv1.RequestMeta{
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RequestId: RequestIDFromContext(request.Context()),
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CommandId: strings.TrimSpace(commandID),
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ActorUserId: auth.UserIDFromContext(request.Context()),
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RoomId: roomID,
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AppCode: appcode.FromContext(request.Context()),
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GatewayNodeId: "gateway-local",
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SessionId: idgen.New("sess"),
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SentAtMs: time.Now().UnixMilli(),
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}
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}
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// UserMeta 生成 user-service RPC 的统一追踪和审计元信息。
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func UserMeta(request *http.Request, deviceID string) *userv1.RequestMeta {
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return UserMetaWithLoginContext(request, deviceID, "", "", "")
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}
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func UserMetaWithLoginContext(request *http.Request, deviceID string, platform string, language string, timezone string) *userv1.RequestMeta {
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return &userv1.RequestMeta{
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RequestId: RequestIDFromContext(request.Context()),
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Caller: "gateway-service",
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GatewayNodeId: "gateway-local",
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SentAtMs: time.Now().UnixMilli(),
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DeviceId: deviceID,
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ClientIp: ClientIP(request),
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UserAgent: request.UserAgent(),
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CountryByIp: CountryByIP(request),
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SessionId: auth.SessionIDFromContext(request.Context()),
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AppCode: appcode.FromContext(request.Context()),
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Platform: strings.ToLower(strings.TrimSpace(platform)),
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Language: strings.TrimSpace(language),
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Timezone: strings.TrimSpace(timezone),
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}
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}
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// ActivityMeta 生成 activity-service RPC 的统一追踪元信息。
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// 业务 actor 仍由各请求显式传 user_id，meta 只承载链路和租户上下文。
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func ActivityMeta(request *http.Request) *activityv1.RequestMeta {
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return &activityv1.RequestMeta{
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RequestId: RequestIDFromContext(request.Context()),
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Caller: "gateway-service",
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GatewayNodeId: "gateway-local",
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SentAtMs: time.Now().UnixMilli(),
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AppCode: appcode.FromContext(request.Context()),
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}
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}
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// ClientIP 提取 gateway 看到的客户端地址。
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func ClientIP(request *http.Request) string {
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for _, header := range []string{"X-Trusted-Client-IP", "X-Real-IP"} {
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if ip := NormalizeIP(request.Header.Get(header)); ip != "" {
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return ip
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}
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}
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forwarded := strings.TrimSpace(request.Header.Get("X-Forwarded-For"))
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if forwarded != "" {
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for part := range strings.SplitSeq(forwarded, ",") {
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ip := NormalizeIP(part)
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if ip == "" {
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continue
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}
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if addr, err := netip.ParseAddr(ip); err == nil && isPublicClientAddr(addr) {
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return ip
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}
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}
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}
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host, _, err := net.SplitHostPort(request.RemoteAddr)
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if err != nil {
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return NormalizeIP(request.RemoteAddr)
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}
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return host
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}
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func NormalizeIP(value string) string {
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value = strings.TrimSpace(value)
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if value == "" {
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return ""
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}
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if host, _, err := net.SplitHostPort(value); err == nil {
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value = host
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}
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if addr, err := netip.ParseAddr(value); err == nil {
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return addr.String()
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}
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return value
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}
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func isPublicClientAddr(addr netip.Addr) bool {
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return addr.IsValid() &&
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addr.IsGlobalUnicast() &&
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!addr.IsPrivate() &&
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!addr.IsLoopback() &&
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!addr.IsLinkLocalUnicast() &&
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!addr.IsLinkLocalMulticast() &&
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!addr.IsMulticast() &&
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!addr.IsUnspecified()
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}
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func CountryByIP(request *http.Request) string {
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// country_by_ip 不接受 JSON body；只采信 gateway/边缘层写入的地域头。
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for _, header := range []string{"CF-IPCountry", "CloudFront-Viewer-Country", "X-Vercel-IP-Country", "X-AppEngine-Country", "X-Country-Code"} {
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country := strings.ToUpper(strings.TrimSpace(request.Header.Get(header)))
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if country == "" || country == "XX" || country == "UNKNOWN" {
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continue
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}
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if len(country) >= 2 && len(country) <= 3 {
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return country
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}
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}
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return ""
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}
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