From 49235fb5ec33569ff7de00ce8198f8c18320210e Mon Sep 17 00:00:00 2001
From: Felix Hanley <felix@userspace.com.au>
Date: Wed, 22 Nov 2017 15:12:39 +1100
Subject: Add start of HTTP request handling

---
 http.go | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 http.go

diff --git a/http.go b/http.go
new file mode 100644
index 0000000..e6939f9
--- /dev/null
+++ b/http.go
@@ -0,0 +1,73 @@
+package dyndns
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	//"strings"
+)
+
+var (
+	ErrBadAuth  = errors.New("badauth")
+	ErrNotFQDN  = errors.New("notfqdn")
+	ErrNoHost   = errors.New("nohost")
+	ErrNumHost  = errors.New("numhost")
+	ErrAbuse    = errors.New("abuse")
+	ErrBadAgent = errors.New("badagent")
+	ErrDNSErr   = errors.New("dnserr")
+	Err911      = errors.New("911")
+)
+
+var errorCode = map[error]int{
+	ErrBadAuth:  401,
+	ErrNotFQDN:  406,
+	ErrNoHost:   406,
+	ErrNumHost:  406,
+	ErrAbuse:    406,
+	ErrBadAgent: 406,
+	ErrDNSErr:   500,
+	Err911:      500,
+}
+
+// https://{user}:{key}@example.com/v3/update?hostname={hostname}
+// https://{user}:{key}@example.com/v3/update?hostname={hostname}&myip={IP address}
+
+func respond(w http.ResponseWriter, e error) {
+	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+	w.Header().Set("X-Content-Type-Options", "nosniff")
+	w.WriteHeader(errorCode[e])
+	fmt.Fprintln(w, e)
+}
+
+func basicAuth(next http.HandlerFunc) http.HandlerFunc {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		username, password, _ := r.BasicAuth()
+
+		if !validateAuth(username, password) {
+			respond(w, ErrBadAuth)
+			return
+		}
+		next(w, r)
+	})
+}
+
+func validateAuth(username, password string) bool {
+	// TODO lookup
+	if username == "username" && password == "password" {
+		return true
+	}
+	return false
+}
+
+func handleRequest(w http.ResponseWriter, r *http.Request) {
+	qs := r.URL.Query()
+
+	hnStr := qs.Get("hostname")
+	if hnStr == "" {
+		respond(w, ErrNoHost)
+		return
+	}
+
+	//hostnames := strings.Split(hnStr, ",")
+
+}
-- 
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