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main.go
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main.go
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// Package main runs a gRPC server running the proto/rpc/examples/fileupload/v1 service.
//
// It is accessible over gRPC, grpc-web, gRPC via RESTful JSON, and gRPC via WebRTC.
package main
import (
"context"
"crypto/ed25519"
"crypto/x509"
"encoding/pem"
"fmt"
"html/template"
"net"
"net/http"
"os"
"strings"
"github.com/Masterminds/sprig"
"github.com/edaniels/golog"
"github.com/pkg/errors"
"go.uber.org/multierr"
"goji.io"
"goji.io/pat"
"go.viam.com/utils"
"go.viam.com/utils/internal"
fupb "go.viam.com/utils/proto/rpc/examples/fileupload/v1"
"go.viam.com/utils/rpc"
"go.viam.com/utils/rpc/examples/fileupload/server"
)
func main() {
utils.ContextualMain(mainWithArgs, logger)
}
var (
defaultPort = 8080
logger = golog.Global().Named("server")
)
// Arguments for the command.
type Arguments struct {
Port utils.NetPortFlag `flag:"0"`
BindAddress string `flag:"bind-address"`
InstanceName string `flag:"instance-name"`
SignalingAddress string `flag:"signaling-address"`
TLSCertFile string `flag:"tls-cert"`
TLSKeyFile string `flag:"tls-key"`
AuthPrivateKeyFile string `flag:"auth-private-key"`
AuthPublicKeyFile string `flag:"auth-public-key"`
APIKey string `flag:"api-key"`
ExternalAuthAddr string `flag:"external-auth-addr"`
ExternalAuth bool `flag:"external-auth"`
}
func mainWithArgs(ctx context.Context, args []string, logger golog.Logger) error {
var argsParsed Arguments
if err := utils.ParseFlags(args, &argsParsed); err != nil {
return err
}
if argsParsed.Port == 0 {
argsParsed.Port = utils.NetPortFlag(defaultPort)
}
if (argsParsed.TLSCertFile == "") != (argsParsed.TLSKeyFile == "") {
return errors.New("must provide both tls-cert and tls-key")
}
return runServer(
ctx,
int(argsParsed.Port),
argsParsed.BindAddress,
argsParsed.InstanceName,
argsParsed.SignalingAddress,
argsParsed.TLSCertFile,
argsParsed.TLSKeyFile,
argsParsed.AuthPrivateKeyFile,
argsParsed.AuthPublicKeyFile,
argsParsed.APIKey,
argsParsed.ExternalAuthAddr,
argsParsed.ExternalAuth,
logger,
)
}
func runServer(
ctx context.Context,
port int,
bindAddress string,
instanceName string,
signalingAddress string,
tlsCertFile string,
tlsKeyFile string,
authPrivateKeyFile string,
authPublicKeyFile string,
apiKey string,
externalAuthAddr string,
externalAuth bool,
logger golog.Logger,
) (err error) {
var serverOpts []rpc.ServerOption
var authPrivKey ed25519.PrivateKey
if authPrivateKeyFile != "" {
//nolint:gosec
rd, err := os.ReadFile(authPrivateKeyFile)
if err != nil {
return err
}
block, _ := pem.Decode(rd)
authPrivateKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return err
}
var ok bool
authPrivKey, ok = authPrivateKey.(ed25519.PrivateKey)
if !ok {
return errors.Errorf("expected private key to be ed25519 but got %T", authPrivateKey)
}
keyOpt, _ := rpc.WithAuthED25519PrivateKey(authPrivKey)
serverOpts = append(serverOpts, keyOpt)
}
var authPublicKey ed25519.PublicKey
if authPublicKeyFile != "" {
//nolint:gosec
rd, err := os.ReadFile(authPublicKeyFile)
if err != nil {
return err
}
block, _ := pem.Decode(rd)
key, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return err
}
var ok bool
authPublicKey, ok = key.(ed25519.PublicKey)
if !ok {
return errors.Errorf("expected ed25519.PublicKey but got %T", key)
}
}
if bindAddress == "" {
bindAddress = fmt.Sprintf("localhost:%d", port)
}
listener, secure, err := utils.NewPossiblySecureTCPListenerFromFile(bindAddress, tlsCertFile, tlsKeyFile)
if err != nil {
return err
}
listenerTCPAddr, ok := listener.Addr().(*net.TCPAddr)
if !ok {
return errors.Errorf("expected *net.TCPAddr but got %T", listener.Addr())
}
listenerAddr := listenerTCPAddr.String()
listenerPort := listenerTCPAddr.Port
var signalingOpts []rpc.DialOption
if signalingAddress != "" && !secure {
signalingOpts = append(signalingOpts, rpc.WithInsecure())
}
serverOpts = append(serverOpts, rpc.WithExternalListenerAddress(listener.Addr().(*net.TCPAddr)))
serverOpts = append(serverOpts, rpc.WithWebRTCServerOptions(rpc.WebRTCServerOptions{
Enable: true,
ExternalSignalingDialOpts: signalingOpts,
ExternalSignalingAddress: signalingAddress,
}))
if instanceName != "" {
serverOpts = append(serverOpts, rpc.WithInstanceNames(instanceName))
}
if apiKey == "" && authPublicKey == nil {
serverOpts = append(serverOpts, rpc.WithUnauthenticated())
} else {
authEntities := []string{
listenerAddr,
bindAddress,
}
if instanceName != "" {
authEntities = append(authEntities, instanceName)
}
handler := rpc.MakeSimpleAuthHandler(authEntities, apiKey)
serverOpts = append(serverOpts, rpc.WithAuthHandler(rpc.CredentialsTypeAPIKey, handler))
if authPublicKey != nil {
serverOpts = append(serverOpts, rpc.WithExternalAuthEd25519PublicKeyTokenVerifier(authPublicKey))
}
}
if externalAuth {
if authPrivKey == nil {
return errors.New("expected auth-private-key")
}
serverOpts = append(serverOpts, rpc.WithAuthenticateToHandler(
func(ctx context.Context, entity string) (map[string]string, error) {
return map[string]string{}, nil
},
))
}
rpcServer, err := rpc.NewServer(logger, serverOpts...)
if err != nil {
return err
}
defer func() {
err = multierr.Combine(err, rpcServer.Stop())
}()
if err := rpcServer.RegisterServiceServer(
ctx,
&fupb.FileUploadService_ServiceDesc,
&server.Server{},
fupb.RegisterFileUploadServiceHandlerFromEndpoint,
); err != nil {
return err
}
t := template.New("foo").Funcs(template.FuncMap{
//nolint:gosec
"jsSafe": func(js string) template.JS {
return template.JS(js)
},
//nolint:gosec
"htmlSafe": func(html string) template.HTML {
return template.HTML(html)
},
}).Funcs(sprig.FuncMap())
t, err = t.ParseGlob(fmt.Sprintf("%s/*.html", internal.ResolveFile("rpc/examples/fileupload/server/templates")))
if err != nil {
return err
}
indexT := t.Lookup("index.html")
mux := goji.NewMux()
mux.Handle(pat.Get("/"), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
type Temp struct {
WebRTCHost string
ExternalAuthAddr string
ExternalAuthToEntity string
Credentials map[string]interface{}
}
temp := Temp{
WebRTCHost: rpcServer.InstanceNames()[0],
ExternalAuthAddr: externalAuthAddr,
ExternalAuthToEntity: rpcServer.InstanceNames()[0],
}
if apiKey != "" {
temp.Credentials = map[string]interface{}{
"type": string(rpc.CredentialsTypeAPIKey),
"payload": apiKey,
}
}
if err := indexT.Execute(w, temp); err != nil {
panic(err)
}
}))
mux.Handle(pat.Get("/static/*"),
http.StripPrefix("/static", http.FileServer(http.Dir(internal.ResolveFile("rpc/examples/fileupload/frontend/dist")))))
mux.Handle(pat.New("/api/*"), http.StripPrefix("/api", rpcServer.GatewayHandler()))
mux.Handle(pat.New("/*"), rpcServer.GRPCHandler())
httpServer, err := utils.NewPossiblySecureHTTPServer(mux, utils.HTTPServerOptions{
Secure: secure,
MaxHeaderBytes: rpc.MaxMessageSize,
Addr: listenerAddr,
})
if err != nil {
return err
}
done := make(chan struct{})
defer func() { <-done }()
utils.PanicCapturingGo(func() {
defer close(done)
<-ctx.Done()
defer func() {
if err := rpcServer.Stop(); err != nil {
panic(err)
}
}()
if err := httpServer.Shutdown(ctx); err != nil && utils.FilterOutError(err, context.Canceled) != nil {
panic(err)
}
})
utils.PanicCapturingGo(func() {
if err := rpcServer.Start(); err != nil {
panic(err)
}
})
utils.ContextMainReadyFunc(ctx)()
var scheme string
if secure {
scheme = "https"
} else {
scheme = "http"
}
if strings.HasPrefix(listenerAddr, "[::]") {
listenerAddr = fmt.Sprintf("0.0.0.0:%d", listenerPort)
}
if listenerTCPAddr.IP.IsLoopback() {
listenerAddr = fmt.Sprintf("localhost:%d", listenerPort)
}
logger.Infow("serving", "url", fmt.Sprintf("%s://%s", scheme, listenerAddr))
if err := httpServer.Serve(listener); err != nil && !errors.Is(err, http.ErrServerClosed) {
return err
}
return nil
}