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ots/main.go

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Go
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package main
import (
"crypto/rand"
"embed"
"encoding/base64"
"io/fs"
"mime"
"net/http"
"os"
"strings"
"text/template"
"time"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
file_helpers "github.com/Luzifer/go_helpers/v2/file"
http_helpers "github.com/Luzifer/go_helpers/v2/http"
"github.com/Luzifer/rconfig/v2"
)
const scriptNonceSize = 32
var (
cfg struct {
Customize string `flag:"customize" default:"" description:"Customize-File to load"`
Listen string `flag:"listen" default:":3000" description:"IP/Port to listen on"`
LogLevel string `flag:"log-level" default:"info" description:"Set log level (debug, info, warning, error)"`
SecretExpiry int64 `flag:"secret-expiry" default:"0" description:"Maximum expiry of the stored secrets in seconds"`
StorageType string `flag:"storage-type" default:"mem" description:"Storage to use for putting secrets to" validate:"nonzero"`
VersionAndExit bool `flag:"version" default:"false" description:"Print version information and exit"`
}
assets file_helpers.FSStack
cust customize
indexTpl *template.Template
version = "dev"
)
//go:embed frontend/*
var embeddedAssets embed.FS
func defaultCSP() http_helpers.CSP {
c := http_helpers.CSP{}
c.Add("base-uri", http_helpers.CSPSrcSelf)
c.Add("default-src", http_helpers.CSPSrcNone)
c.Add("connect-src", http_helpers.CSPSrcSelf)
c.Add("font-src", http_helpers.CSPSrcSelf)
c.Add("img-src", http_helpers.CSPSrcSelf)
c.Add("img-src", http_helpers.CSPSrcSchemeData)
c.Add("script-src", http_helpers.CSPSrcSelf)
c.Add("style-src", http_helpers.CSPSrcSelf)
return c
}
func initApp() error {
rconfig.AutoEnv(true)
if err := rconfig.ParseAndValidate(&cfg); err != nil {
return errors.Wrap(err, "parsing cli options")
}
l, err := logrus.ParseLevel(cfg.LogLevel)
if err != nil {
return errors.Wrap(err, "parsing log-level")
}
logrus.SetLevel(l)
if cust, err = loadCustomize(cfg.Customize); err != nil {
return errors.Wrap(err, "loading customizations")
}
frontendFS, err := fs.Sub(embeddedAssets, "frontend")
if err != nil {
return errors.Wrap(err, "creating sub-fs for assets")
}
assets = append(assets, frontendFS)
if cust.OverlayFSPath != "" {
assets = append(file_helpers.FSStack{os.DirFS(cust.OverlayFSPath)}, assets...)
}
return nil
}
func main() {
var err error
if err = initApp(); err != nil {
logrus.WithError(err).Fatal("initializing app")
}
if cfg.VersionAndExit {
logrus.WithField("version", version).Info("ots")
os.Exit(0)
}
// Initialize index template in order not to parse it multiple times
source, err := assets.ReadFile("index.html")
if err != nil {
logrus.WithError(err).Fatal("frontend folder should contain index.html Go template")
}
indexTpl = template.Must(template.New("index.html").Funcs(tplFuncs).Parse(string(source)))
// Initialize storage
store, err := getStorageByType(cfg.StorageType)
if err != nil {
logrus.WithError(err).Fatal("initializing storage")
}
api := newAPI(store)
r := mux.NewRouter()
r.Use(http_helpers.GzipHandler)
api.Register(r.PathPrefix("/api").Subrouter())
r.HandleFunc("/", handleIndex)
r.PathPrefix("/").HandlerFunc(assetDelivery)
logrus.WithFields(logrus.Fields{
"secret_expiry": time.Duration(cfg.SecretExpiry) * time.Second,
"version": version,
}).Info("ots started")
server := &http.Server{
Addr: cfg.Listen,
Handler: http_helpers.NewHTTPLogHandlerWithLogger(r, logrus.StandardLogger()),
ReadHeaderTimeout: time.Second,
}
if err = server.ListenAndServe(); err != nil {
logrus.WithError(err).Fatal("HTTP server quit unexpectedly")
}
}
func assetDelivery(w http.ResponseWriter, r *http.Request) {
assetName := strings.TrimLeft(r.URL.Path, "/")
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dot := strings.LastIndex(assetName, ".")
if dot < 0 {
// There are no assets with no dot in it
http.Error(w, "404 not found", http.StatusNotFound)
return
}
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ext := assetName[dot:]
assetData, err := assets.ReadFile(assetName)
if err != nil {
http.Error(w, "404 not found", http.StatusNotFound)
return
}
w.Header().Set("Content-Type", mime.TypeByExtension(ext))
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w.Header().Set("X-Content-Type-Options", "nosniff")
w.Write(assetData)
}
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func handleIndex(w http.ResponseWriter, r *http.Request) {
inlineContentNonce := make([]byte, scriptNonceSize)
if _, err := rand.Read(inlineContentNonce); err != nil {
logrus.WithError(err).Error("generating script nonce")
http.Error(w, "something went wrong", http.StatusInternalServerError)
return
}
inlineContentNonceStr := base64.StdEncoding.EncodeToString(inlineContentNonce)
policy := defaultCSP()
policy.Add("script-src", http_helpers.CSPSrcNonce(inlineContentNonceStr))
policy.Add("style-src", http_helpers.CSPSrcNonce(inlineContentNonceStr))
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Header().Set("Referrer-Policy", "no-referrer")
w.Header().Set("X-Frame-Options", "DENY")
w.Header().Set("X-Xss-Protection", "1; mode=block")
w.Header().Set("Content-Security-Policy", policy.ToHeaderValue())
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w.Header().Set("X-Content-Type-Options", "nosniff")
if err := indexTpl.Execute(w, struct {
Customize customize
InlineContentNonce string
MaxSecretExpiry int64
Version string
}{
Customize: cust,
InlineContentNonce: inlineContentNonceStr,
MaxSecretExpiry: cfg.SecretExpiry,
Version: version,
}); err != nil {
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http.Error(w, errors.Wrap(err, "executing template").Error(), http.StatusInternalServerError)
return
}
}