clair/api/api.go

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2015-11-13 19:11:28 +00:00
// Copyright 2015 clair authors
//
// 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 api provides a RESTful HTTP API, enabling external apps to interact
// with clair.
package api
import (
"io/ioutil"
"net"
"net/http"
"strconv"
"time"
"crypto/tls"
"crypto/x509"
"github.com/coreos/pkg/capnslog"
"github.com/coreos/clair/utils"
"github.com/tylerb/graceful"
)
var log = capnslog.NewPackageLogger("github.com/coreos/clair", "api")
// Config represents the configuration for the Main API.
type Config struct {
Port int
TimeOut time.Duration
CertFile, KeyFile, CAFile string
}
// RunMain launches the main API, which exposes every possible interactions
// with clair.
func RunMain(conf *Config, st *utils.Stopper) {
log.Infof("starting API on port %d.", conf.Port)
defer func() {
log.Info("API stopped")
st.End()
}()
srv := &graceful.Server{
Timeout: 0, // Already handled by our TimeOut middleware
NoSignalHandling: true, // We want to use our own Stopper
Server: &http.Server{
Addr: ":" + strconv.Itoa(conf.Port),
TLSConfig: setupClientCert(conf.CAFile),
Handler: NewVersionRouter(conf.TimeOut),
},
}
listenAndServeWithStopper(srv, st, conf.CertFile, conf.KeyFile)
}
// RunHealth launches the Health API, which only exposes a method to fetch
// clair's health without any security or authentification mechanism.
func RunHealth(port int, st *utils.Stopper) {
log.Infof("starting Health API on port %d.", port)
defer func() {
log.Info("Health API stopped")
st.End()
}()
srv := &graceful.Server{
Timeout: 10 * time.Second, // Interrupt health checks when stopping
NoSignalHandling: true, // We want to use our own Stopper
Server: &http.Server{
Addr: ":" + strconv.Itoa(port),
Handler: NewHealthRouter(),
},
}
listenAndServeWithStopper(srv, st, "", "")
}
// listenAndServeWithStopper wraps graceful.Server's
// ListenAndServe/ListenAndServeTLS and adds the ability to interrupt them with
// the provided utils.Stopper
func listenAndServeWithStopper(srv *graceful.Server, st *utils.Stopper, certFile, keyFile string) {
go func() {
<-st.Chan()
srv.Stop(0)
}()
var err error
if certFile != "" && keyFile != "" {
log.Info("API: TLS Enabled")
err = srv.ListenAndServeTLS(certFile, keyFile)
} else {
err = srv.ListenAndServe()
}
if opErr, ok := err.(*net.OpError); !ok || (ok && opErr.Op != "accept") {
log.Fatal(err)
}
}
// setupClientCert creates a tls.Config instance using a CA file path
// (if provided) and and calls log.Fatal if it does not exist.
func setupClientCert(caFile string) *tls.Config {
if len(caFile) > 0 {
log.Info("API: Client Certificate Authentification Enabled")
caCert, err := ioutil.ReadFile(caFile)
if err != nil {
log.Fatal(err)
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
return &tls.Config{
ClientCAs: caCertPool,
ClientAuth: tls.RequireAndVerifyClientCert,
}
}
return &tls.Config{
ClientAuth: tls.NoClientCert,
}
}