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package gateway
import (
"bytes"
"fmt"
"io"
"net/http"
"path"
"strings"
"google.golang.org/grpc"
"google.golang.org/grpc/connectivity"
"google.golang.org/grpc/grpclog"
)
// openAPIServer returns OpenAPI specification files located under "/openapiv2/"
func openAPIServer(dir string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if !strings.HasSuffix(r.URL.Path, ".swagger.json") {
grpclog.Errorf("Not Found: %s", r.URL.Path)
http.NotFound(w, r)
return
}
grpclog.Infof("Serving %s", r.URL.Path)
p := strings.TrimPrefix(r.URL.Path, "/openapiv2/")
p = path.Join(dir, p)
http.ServeFile(w, r, p)
}
}
// allowCORS allows Cross Origin Resource Sharing from any origin.
// Don't do this without consideration in production systems.
func allowCORS(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if origin := r.Header.Get("Origin"); origin != "" {
w.Header().Set("Access-Control-Allow-Origin", origin)
if r.Method == "OPTIONS" && r.Header.Get("Access-Control-Request-Method") != "" {
preflightHandler(w, r)
return
}
}
h.ServeHTTP(w, r)
})
}
// preflightHandler adds the necessary headers in order to serve
// CORS from any origin using the methods "GET", "HEAD", "POST", "PUT", "DELETE"
// We insist, don't do this without consideration in production systems.
func preflightHandler(w http.ResponseWriter, r *http.Request) {
headers := []string{"Content-Type", "Accept", "Authorization"}
w.Header().Set("Access-Control-Allow-Headers", strings.Join(headers, ","))
methods := []string{"GET", "HEAD", "POST", "PUT", "DELETE"}
w.Header().Set("Access-Control-Allow-Methods", strings.Join(methods, ","))
grpclog.Infof("Preflight request for %s", r.URL.Path)
}
// healthzServer returns a simple health handler which returns ok.
func healthzServer(conn *grpc.ClientConn) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain")
if s := conn.GetState(); s != connectivity.Ready {
http.Error(w, fmt.Sprintf("grpc server is %s", s), http.StatusBadGateway)
return
}
fmt.Fprintln(w, "ok")
}
}
type logResponseWriter struct {
http.ResponseWriter
statusCode int
}
func (rsp *logResponseWriter) WriteHeader(code int) {
rsp.statusCode = code
rsp.ResponseWriter.WriteHeader(code)
}
// Unwrap returns the original http.ResponseWriter. This is necessary
// to expose Flush() and Push() on the underlying response writer.
func (rsp *logResponseWriter) Unwrap() http.ResponseWriter {
return rsp.ResponseWriter
}
func newLogResponseWriter(w http.ResponseWriter) *logResponseWriter {
return &logResponseWriter{w, http.StatusOK}
}
// logRequestBody logs the request body when the response status code is not 200.
// This addresses the issue of being unable to retrieve the request body in the customErrorHandler middleware.
func logRequestBody(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
lw := newLogResponseWriter(w)
body, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, fmt.Sprintf("grpc server read request body err %+v", err), http.StatusBadRequest)
return
}
clonedR := r.Clone(r.Context())
clonedR.Body = io.NopCloser(bytes.NewReader(body))
h.ServeHTTP(lw, clonedR)
if lw.statusCode != http.StatusOK {
grpclog.Errorf("http error %+v request body %+v", lw.statusCode, string(body))
}
})
}
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