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/
main.go
177 lines (152 loc) · 3.86 KB
/
main.go
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package main
import (
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/aws/signer/v4"
"github.com/DataDog/datadog-go/statsd"
"github.com/kelseyhightower/envconfig"
"github.com/sha1sum/aws_signing_client"
"crypto/tls"
"crypto/x509"
"io/ioutil"
"log"
"net/http"
"net/url"
"time"
"github.com/mozilla-services/aws-signing-proxy/proxy"
)
const (
appNamespace = "SIGNING_PROXY"
version = "1.0.3"
)
var (
statsdClient *statsd.Client
httpClient *http.Client
pool *x509.CertPool
)
// get CA certs for our http.Client
func init() {
// cacert.pem is a runtime dependency!
bs, err := ioutil.ReadFile("cacert.pem")
if err != nil {
log.Fatal(err.Error())
}
pool = x509.NewCertPool()
pool.AppendCertsFromPEM(bs)
// default http client with a timeout
httpClient = &http.Client{
Timeout: time.Second * 10,
Transport: &http.Transport{
TLSClientConfig: &tls.Config{RootCAs: pool},
},
}
}
func loggingMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log.Println(r.Method + " " + r.RequestURI)
next.ServeHTTP(w, r)
})
}
func statsdMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
err := statsdClient.Incr("requests", []string{}, 1.0)
if err != nil {
log.Println(err.Error())
}
next.ServeHTTP(w, r)
})
}
func getEC2Tags(metadata *ec2metadata.EC2Metadata) []string {
region, err := metadata.Region()
if err != nil {
log.Println(err.Error())
}
return []string{
"region:" + region,
}
}
func main() {
config := struct {
LogRequests bool `default:"true" split_words:"true"`
Statsd bool `default:"true"`
StatsdListen string `default:"127.0.0.1:8125" split_words:"true"`
StatsdNamespace string `default:""`
Listen string `default:"0.0.0.0:8000"`
Service string `default:"s3"`
Region string `default:"us-east-1"`
Destination string `default:"https://s3.amazonaws.com"`
}{}
// load envconfig
err := envconfig.Process(appNamespace, &config)
if err != nil {
log.Fatal(err.Error())
}
// *url.URL for convenience
destinationURL, err := url.Parse(config.Destination)
if err != nil {
log.Fatal("Could not parse destination URL: " + err.Error())
}
// initialize AWS session
sess := session.Must(session.NewSession(&aws.Config{
Region: aws.String(config.Region),
}))
ec2tags := []string{}
metadata := ec2metadata.New(sess)
if metadata.Available() {
ec2tags = getEC2Tags(metadata)
}
// create signing http client
signer := v4.NewSigner(sess.Config.Credentials)
signingClient, err := aws_signing_client.New(
signer,
httpClient,
config.Service,
config.Region,
)
if err != nil {
log.Fatal(err.Error())
}
// create proxy using signing http client
prxy, err := proxy.New(
destinationURL,
signingClient,
)
if err != nil {
log.Fatal(err.Error())
}
var handler http.Handler
handler = prxy
// wrap handler for logging
if config.LogRequests {
handler = loggingMiddleware(handler)
}
// wrap handler for statsd
if config.Statsd {
statsdClient, err := statsd.New(config.StatsdListen)
if err != nil {
log.Fatal(err.Error())
}
// prepended to metrics
if config.StatsdNamespace == "" {
statsdClient.Namespace = appNamespace + "."
} else {
statsdClient.Namespace = config.StatsdNamespace + "."
}
statsdClient.Tags = append(statsdClient.Tags, ec2tags...)
handler = statsdMiddleware(handler)
}
log.Println("starting " + appNamespace)
// sane default timeouts
srv := &http.Server{
Addr: config.Listen,
ReadTimeout: 5 * time.Second,
WriteTimeout: 10 * time.Second,
IdleTimeout: 60 * time.Second,
Handler: handler,
}
err = srv.ListenAndServe()
if err != nil {
log.Fatal(err.Error())
}
}