From eed10ce514f28e4acf772f76c92ca05eebec105f Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Thu, 5 May 2022 21:20:22 -0600
Subject: Fix various problems with the srv build

---
 srv/src/api/middleware.go | 96 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 srv/src/api/middleware.go

(limited to 'srv/src/api/middleware.go')

diff --git a/srv/src/api/middleware.go b/srv/src/api/middleware.go
new file mode 100644
index 0000000..6ea0d13
--- /dev/null
+++ b/srv/src/api/middleware.go
@@ -0,0 +1,96 @@
+package api
+
+import (
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutils"
+	"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
+	"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
+)
+
+func addResponseHeaders(headers map[string]string, h http.Handler) http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+		for k, v := range headers {
+			rw.Header().Set(k, v)
+		}
+		h.ServeHTTP(rw, r)
+	})
+}
+
+func annotateMiddleware(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		type reqInfoKey string
+
+		ip, _, _ := net.SplitHostPort(r.RemoteAddr)
+
+		ctx := r.Context()
+		ctx = mctx.Annotate(ctx,
+			reqInfoKey("remote_ip"), ip,
+			reqInfoKey("url"), r.URL,
+			reqInfoKey("method"), r.Method,
+		)
+
+		r = r.WithContext(ctx)
+		h.ServeHTTP(rw, r)
+	})
+}
+
+type logResponseWriter struct {
+	http.ResponseWriter
+	http.Hijacker
+	statusCode int
+}
+
+func newLogResponseWriter(rw http.ResponseWriter) *logResponseWriter {
+	h, _ := rw.(http.Hijacker)
+	return &logResponseWriter{
+		ResponseWriter: rw,
+		Hijacker:       h,
+		statusCode:     200,
+	}
+}
+
+func (lrw *logResponseWriter) WriteHeader(statusCode int) {
+	lrw.statusCode = statusCode
+	lrw.ResponseWriter.WriteHeader(statusCode)
+}
+
+func logMiddleware(logger *mlog.Logger, h http.Handler) http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		r = apiutils.SetRequestLogger(r, logger)
+
+		lrw := newLogResponseWriter(rw)
+
+		started := time.Now()
+		h.ServeHTTP(lrw, r)
+		took := time.Since(started)
+
+		type logCtxKey string
+
+		ctx := r.Context()
+		ctx = mctx.Annotate(ctx,
+			logCtxKey("took"), took.String(),
+			logCtxKey("response_code"), lrw.statusCode,
+		)
+
+		logger.Info(ctx, "handled HTTP request")
+	})
+}
+
+func postOnlyMiddleware(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		// we allow websockets to not be POSTs because, well, they can't be
+		if r.Method == "POST" || r.Header.Get("Upgrade") == "websocket" {
+			h.ServeHTTP(rw, r)
+			return
+		}
+
+		apiutils.GetRequestLogger(r).WarnString(r.Context(), "method not allowed")
+		rw.WriteHeader(405)
+	})
+}
-- 
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