initial commit

3 files changed, 69 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1f0220a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,23 @@
+.POSIX:
+.SUFFIXES:
+
+GO = go
+RM = rm
+GOFLAGS =
+PREFIX = /usr/local
+BINDIR = $(PREFIX)/bin
+
+goflags = $(GOFLAGS)
+
+all: whoami
+
+whoami:
+	$(GO) build $(goflags)
+
+clean:
+	$(RM) -f whoami
+
+install: all
+	mkdir -p $(DESTDIR)$(BINDIR)
+	cp -f whoami $(DESTDIR)$(BINDIR)
+
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..89caab4
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module whoami
+
+go 1.19
diff --git a/whoami.go b/whoami.go
new file mode 100644
index 0000000..de583e9
--- /dev/null
+++ b/whoami.go
@@ -0,0 +1,43 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"html"
+	"log"
+	"net/http"
+	"sort"
+)
+
+func RequestHandler(w http.ResponseWriter, r *http.Request) {
+
+	fmt.Fprintf(w, "\"Host\": %q\n", html.EscapeString(r.Host))
+	fmt.Fprintf(w, "\"IP\": %q\n", html.EscapeString(r.RemoteAddr))
+	fmt.Fprintf(w, "\"URI\": %q\n", html.EscapeString(r.RequestURI))
+
+	keys := make([]string, 0)
+	for k, _ := range r.Header {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	for _, k := range keys {
+		for _, value := range r.Header[k] {
+			fmt.Fprintf(w, "%q: %q\n", html.EscapeString(k), html.EscapeString(value))
+		}
+	}
+}
+
+func main() {
+
+	var (
+		host string
+		port uint64
+	)
+	flag.StringVar(&host, "host", "127.0.0.1", "IP address to listen on")
+	flag.Uint64Var(&port, "port", 8080, "Port to listen on (default 8080)")
+	flag.Parse()
+
+	http.HandleFunc("/", RequestHandler)
+	fmt.Printf("Listening on %v port %v (http://%v:%v/)\n", host, port, host, port)
+	log.Fatal(http.ListenAndServe(fmt.Sprintf("%s:%d", host, port), nil))
+}