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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Implementation of Server

package httptest

import (
        "crypto/tls"
        "flag"
        "fmt"
        "net"
        "net/http"
        "os"
)

// A Server is an HTTP server listening on a system-chosen port on the
// local loopback interface, for use in end-to-end HTTP tests.
type Server struct {
        URL      string // base URL of form http://ipaddr:port with no trailing slash
        Listener net.Listener
        TLS      *tls.Config // nil if not using using TLS

        // Config may be changed after calling NewUnstartedServer and
        // before Start or StartTLS.
        Config *http.Server
}

// historyListener keeps track of all connections that it's ever
// accepted.
type historyListener struct {
        net.Listener
        history []net.Conn
}

func (hs *historyListener) Accept() (c net.Conn, err error) {
        c, err = hs.Listener.Accept()
        if err == nil {
                hs.history = append(hs.history, c)
        }
        return
}

func newLocalListener() net.Listener {
        if *serve != "" {
                l, err := net.Listen("tcp", *serve)
                if err != nil {
                        panic(fmt.Sprintf("httptest: failed to listen on %v: %v", *serve, err))
                }
                return l
        }
        l, err := net.Listen("tcp", "127.0.0.1:0")
        if err != nil {
                if l, err = net.Listen("tcp6", "[::1]:0"); err != nil {
                        panic(fmt.Sprintf("httptest: failed to listen on a port: %v", err))
                }
        }
        return l
}

// When debugging a particular http server-based test,
// this flag lets you run
//      gotest -run=BrokenTest -httptest.serve=127.0.0.1:8000
// to start the broken server so you can interact with it manually.
var serve = flag.String("httptest.serve", "", "if non-empty, httptest.NewServer serves on this address and blocks")

// NewServer starts and returns a new Server.
// The caller should call Close when finished, to shut it down.
func NewServer(handler http.Handler) *Server {
        ts := NewUnstartedServer(handler)
        ts.Start()
        return ts
}

// NewUnstartedServer returns a new Server but doesn't start it.
//
// After changing its configuration, the caller should call Start or
// StartTLS.
//
// The caller should call Close when finished, to shut it down.
func NewUnstartedServer(handler http.Handler) *Server {
        return &Server{
                Listener: newLocalListener(),
                Config:   &http.Server{Handler: handler},
        }
}

// Start starts a server from NewUnstartedServer.
func (s *Server) Start() {
        if s.URL != "" {
                panic("Server already started")
        }
        s.Listener = &historyListener{s.Listener, make([]net.Conn, 0)}
        s.URL = "http://" + s.Listener.Addr().String()
        go s.Config.Serve(s.Listener)
        if *serve != "" {
                fmt.Println(os.Stderr, "httptest: serving on", s.URL)
                select {}
        }
}

// StartTLS starts TLS on a server from NewUnstartedServer.
func (s *Server) StartTLS() {
        if s.URL != "" {
                panic("Server already started")
        }
        cert, err := tls.X509KeyPair(localhostCert, localhostKey)
        if err != nil {
                panic(fmt.Sprintf("httptest: NewTLSServer: %v", err))
        }

        s.TLS = &tls.Config{
                NextProtos:   []string{"http/1.1"},
                Certificates: []tls.Certificate{cert},
        }
        tlsListener := tls.NewListener(s.Listener, s.TLS)

        s.Listener = &historyListener{tlsListener, make([]net.Conn, 0)}
        s.URL = "https://" + s.Listener.Addr().String()
        go s.Config.Serve(s.Listener)
}

// NewTLSServer starts and returns a new Server using TLS.
// The caller should call Close when finished, to shut it down.
func NewTLSServer(handler http.Handler) *Server {
        ts := NewUnstartedServer(handler)
        ts.StartTLS()
        return ts
}

// Close shuts down the server.
func (s *Server) Close() {
        s.Listener.Close()
}

// CloseClientConnections closes any currently open HTTP connections
// to the test Server.
func (s *Server) CloseClientConnections() {
        hl, ok := s.Listener.(*historyListener)
        if !ok {
                return
        }
        for _, conn := range hl.history {
                conn.Close()
        }
}

// localhostCert is a PEM-encoded TLS cert with SAN DNS names
// "127.0.0.1" and "[::1]", expiring at the last second of 2049 (the end
// of ASN.1 time).
var localhostCert = []byte(`-----BEGIN CERTIFICATE-----
MIIBOTCB5qADAgECAgEAMAsGCSqGSIb3DQEBBTAAMB4XDTcwMDEwMTAwMDAwMFoX
DTQ5MTIzMTIzNTk1OVowADBaMAsGCSqGSIb3DQEBAQNLADBIAkEAsuA5mAFMj6Q7
qoBzcvKzIq4kzuT5epSp2AkcQfyBHm7K13Ws7u+0b5Vb9gqTf5cAiIKcrtrXVqkL
8i1UQF6AzwIDAQABo08wTTAOBgNVHQ8BAf8EBAMCACQwDQYDVR0OBAYEBAECAwQw
DwYDVR0jBAgwBoAEAQIDBDAbBgNVHREEFDASggkxMjcuMC4wLjGCBVs6OjFdMAsG
CSqGSIb3DQEBBQNBAJH30zjLWRztrWpOCgJL8RQWLaKzhK79pVhAx6q/3NrF16C7
+l1BRZstTwIGdoGId8BRpErK1TXkniFb95ZMynM=
-----END CERTIFICATE-----
`)

// localhostKey is the private key for localhostCert.
var localhostKey = []byte(`-----BEGIN RSA PRIVATE KEY-----
MIIBPQIBAAJBALLgOZgBTI+kO6qAc3LysyKuJM7k+XqUqdgJHEH8gR5uytd1rO7v
tG+VW/YKk3+XAIiCnK7a11apC/ItVEBegM8CAwEAAQJBAI5sxq7naeR9ahyqRkJi
SIv2iMxLuPEHaezf5CYOPWjSjBPyVhyRevkhtqEjF/WkgL7C2nWpYHsUcBDBQVF0
3KECIQDtEGB2ulnkZAahl3WuJziXGLB+p8Wgx7wzSM6bHu1c6QIhAMEp++CaS+SJ
/TrU0zwY/fW4SvQeb49BPZUF3oqR8Xz3AiEA1rAJHBzBgdOQKdE3ksMUPcnvNJSN
poCcELmz2clVXtkCIQCLytuLV38XHToTipR4yMl6O+6arzAjZ56uq7m7ZRV0TwIh
AM65XAOw8Dsg9Kq78aYXiOEDc5DL0sbFUu/SlmRcCg93
-----END RSA PRIVATE KEY-----
`)