From 6e84b1df97a80e6180734c30d4763268dc5b3236 Mon Sep 17 00:00:00 2001
From: Harshavardhana <harsha@harshavardhana.net>
Date: Tue, 13 Jan 2015 17:34:44 -0800
Subject: [PATCH] Provide package http as a http.Server wrapper

---
 pkg/http/server.go      | 134 ++++++++++++++++++++++++++++++++++++++++
 pkg/http/server_test.go |  19 ++++++
 2 files changed, 153 insertions(+)
 create mode 100644 pkg/http/server.go
 create mode 100644 pkg/http/server_test.go

diff --git a/pkg/http/server.go b/pkg/http/server.go
new file mode 100644
index 000000000..a7fb237ce
--- /dev/null
+++ b/pkg/http/server.go
@@ -0,0 +1,134 @@
+/*
+/*
+ * Mini Object Storage, (C) 2014 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+*/
+
+// Package http implements a wrapper around golang's own http.Server
+package http
+
+import (
+	"crypto/rand"
+	"crypto/tls"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"sync"
+	"time"
+)
+
+type Server struct {
+	mux         *http.ServeMux
+	listener    net.Listener
+	enableTLS   bool
+	tlsCertFile string
+	tlsKeyFile  string
+	mu          sync.Mutex
+}
+
+// Enable tls
+func (s *Server) EnableTLS(certFile, keyFile string) {
+	s.enableTLS = true
+	s.tlsCertFile = certFile
+	s.tlsKeyFile = keyFile
+}
+
+// Get Listen URL
+func (s *Server) GetlistenURL() string {
+	scheme := "http"
+	if s.enableTLS {
+		scheme = "https"
+	}
+	if s.listener != nil {
+		if taddr, ok := s.listener.Addr().(*net.TCPAddr); ok {
+			if taddr.IP.IsUnspecified() {
+				return fmt.Sprintf("%s://localhost:%d", scheme, taddr.Port)
+			}
+			return fmt.Sprintf("%s://%s", scheme, s.listener.Addr())
+		}
+	}
+	return ""
+}
+
+func (s *Server) HandleFunc(pattern string, fn func(http.ResponseWriter, *http.Request)) {
+	s.mux.HandleFunc(pattern, fn)
+}
+
+func (s *Server) Handle(pattern string, handler http.Handler) {
+	s.mux.Handle(pattern, handler)
+}
+
+func (s *Server) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	s.mux.ServeHTTP(rw, req)
+}
+
+// Listen starts listening on the given host:port addr.
+func (s *Server) Listen(addr string) error {
+	if s.listener != nil {
+		return nil
+	}
+	if addr == "" {
+		return fmt.Errorf("<host>:<port> needs to be provided to start listening")
+	}
+
+	var err error
+	_, _, err = net.SplitHostPort(addr)
+	if err != nil {
+		return fmt.Errorf("Failed to split %s: %v", addr, err)
+	}
+
+	s.listener, err = net.Listen("tcp", addr)
+	if err != nil {
+		return fmt.Errorf("Failed to listen on %s: %v", addr, err)
+	}
+
+	log.Printf("Starting to listen on %s\n", s.GetlistenURL())
+
+	if s.enableTLS {
+		config := &tls.Config{
+			Rand:       rand.Reader,
+			Time:       time.Now,
+			NextProtos: []string{"http/1.1"},
+		}
+		config.Certificates = make([]tls.Certificate, 1)
+
+		config.Certificates[0], err = loadX509KeyPair(s.tlsCertFile, s.tlsKeyFile)
+		if err != nil {
+			return fmt.Errorf("Failed to load TLS cert: %v", err)
+		}
+		s.listener = tls.NewListener(s.listener, config)
+	}
+
+	return nil
+}
+
+func NewServer() *Server {
+	return &Server{
+		mux: http.NewServeMux(),
+	}
+}
+
+func loadX509KeyPair(certFile, keyFile string) (cert tls.Certificate, err error) {
+	certPEMBlock, err := ioutil.ReadFile(certFile)
+	if err != nil {
+		return
+	}
+	keyPEMBlock, err := ioutil.ReadFile(keyFile)
+	if err != nil {
+		return
+	}
+	return tls.X509KeyPair(certPEMBlock, keyPEMBlock)
+}
diff --git a/pkg/http/server_test.go b/pkg/http/server_test.go
new file mode 100644
index 000000000..628af9a29
--- /dev/null
+++ b/pkg/http/server_test.go
@@ -0,0 +1,19 @@
+package http
+
+import (
+	. "gopkg.in/check.v1"
+	"testing"
+)
+
+type MySuite struct{}
+
+var _ = Suite(&MySuite{})
+
+func Test(t *testing.T) { TestingT(t) }
+
+func (s *MySuite) TestHTTP(c *C) {
+	server := NewServer()
+	err := server.Listen("localhost:7000")
+	c.Assert(err, IsNil)
+	c.Assert(server.GetlistenURL(), Not(Equals), "")
+}