Make NDF accessibility a CLI option

api/ndf.go

+package api
+
+import (
+	"encoding/base64"
+	"github.com/pkg/errors"
+	pb "gitlab.com/elixxir/comms/mixmessages"
+	"gitlab.com/xx_network/comms/signature"
+	"gitlab.com/xx_network/crypto/tls"
+	"google.golang.org/protobuf/proto"
+	"io/ioutil"
+	"net/http"
+)
+
+// DownloadAndVerifySignedNdfWithUrl retrieves the NDF from a specified URL.
+// The NDF is processed into a protobuf containing a signature which
+// is verified using the cert string passed in. The NDF is returned as marshaled
+// byte data which may be used to start a client.
+func DownloadAndVerifySignedNdfWithUrl(url, cert string) ([]byte, error) {
+	// Build a request for the file
+	resp, err := http.Get(url)
+	if err != nil {
+		return nil, errors.WithMessagef(err, "Failed to retrieve "+
+			"NDF from %s", url)
+	}
+	defer resp.Body.Close()
+
+	// Download contents of the file
+	signedNdfEncoded, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, errors.WithMessage(err, "Failed to read signed "+
+			"NDF response request")
+	}
+
+	// Process the download NDF and return the marshaled NDF
+	return processAndVerifySignedNdf(signedNdfEncoded, cert)
+}
+
+// processAndVerifySignedNdf is a helper function which parses the downloaded NDF
+// into a protobuf containing a signature. The signature is verified using the
+// passed in cert. Upon successful parsing and verification, the NDF is
+// returned as byte data.
+func processAndVerifySignedNdf(signedNdfEncoded []byte, cert string) ([]byte, error) {
+	// Base64 decode the signed NDF
+	signedNdfMarshaled, err := base64.StdEncoding.DecodeString(
+		string(signedNdfEncoded))
+	if err != nil {
+		return nil, errors.WithMessage(err, "Failed to decode signed NDF")
+	}
+
+	// Unmarshal the signed NDF
+	signedNdfMsg := &pb.NDF{}
+	err = proto.Unmarshal(signedNdfMarshaled, signedNdfMsg)
+	if err != nil {
+		return nil, errors.WithMessage(err, "Failed to unmarshal "+
+			"signed NDF into protobuf")
+	}
+
+	// Load the certificate from it's PEM contents
+	schedulingCert, err := tls.LoadCertificate(cert)
+	if err != nil {
+		return nil, errors.WithMessagef(err, "Failed to parse scheduling cert (%s)", cert)
+	}
+
+	// Extract the public key from the cert
+	schedulingPubKey, err := tls.ExtractPublicKey(schedulingCert)
+	if err != nil {
+		return nil, errors.WithMessage(err, "Failed to extract public key from cert")
+	}
+
+	// Verify signed NDF message
+	err = signature.VerifyRsa(signedNdfMsg, schedulingPubKey)
+	if err != nil {
+		return nil, errors.WithMessage(err, "Failed to verify signed NDF message")
+	}
+
+	return signedNdfMsg.Ndf, nil
+}

bindings/ndf.go

@@ -8,14 +8,7 @@
 package bindings
 
 import (
-	"encoding/base64"
-	"github.com/pkg/errors"
-	pb "gitlab.com/elixxir/comms/mixmessages"
-	"gitlab.com/xx_network/comms/signature"
-	"gitlab.com/xx_network/crypto/tls"
-	"google.golang.org/protobuf/proto"
-	"io/ioutil"
-	"net/http"
+	"gitlab.com/elixxir/client/api"
 )
 
 // DownloadAndVerifySignedNdfWithUrl retrieves the NDF from a specified URL.
@@ -23,62 +16,5 @@ import (
 // is verified using the cert string passed in. The NDF is returned as marshaled
 // byte data which may be used to start a client.
 func DownloadAndVerifySignedNdfWithUrl(url, cert string) ([]byte, error) {
-	// Build a request for the file
-	resp, err := http.Get(url)
-	if err != nil {
-		return nil, errors.WithMessagef(err, "Failed to retrieve "+
-			"NDF from %s", url)
-	}
-	defer resp.Body.Close()
-
-	// Download contents of the file
-	signedNdfEncoded, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return nil, errors.WithMessage(err, "Failed to read signed "+
-			"NDF response request")
-	}
-
-	// Process the download NDF and return the marshaled NDF
-	return processAndVerifySignedNdf(signedNdfEncoded, cert)
-}
-
-// processAndVerifySignedNdf is a helper function which parses the downloaded NDF
-// into a protobuf containing a signature. The signature is verified using the
-// passed in cert. Upon successful parsing and verification, the NDF is
-// returned as byte data.
-func processAndVerifySignedNdf(signedNdfEncoded []byte, cert string) ([]byte, error) {
-	// Base64 decode the signed NDF
-	signedNdfMarshaled, err := base64.StdEncoding.DecodeString(
-		string(signedNdfEncoded))
-	if err != nil {
-		return nil, errors.WithMessage(err, "Failed to decode signed NDF")
-	}
-
-	// Unmarshal the signed NDF
-	signedNdfMsg := &pb.NDF{}
-	err = proto.Unmarshal(signedNdfMarshaled, signedNdfMsg)
-	if err != nil {
-		return nil, errors.WithMessage(err, "Failed to unmarshal "+
-			"signed NDF into protobuf")
-	}
-
-	// Load the certificate from it's PEM contents
-	schedulingCert, err := tls.LoadCertificate(cert)
-	if err != nil {
-		return nil, errors.WithMessagef(err, "Failed to parse scheduling cert (%s)", cert)
-	}
-
-	// Extract the public key from the cert
-	schedulingPubKey, err := tls.ExtractPublicKey(schedulingCert)
-	if err != nil {
-		return nil, errors.WithMessage(err, "Failed to extract public key from cert")
-	}
-
-	// Verify signed NDF message
-	err = signature.VerifyRsa(signedNdfMsg, schedulingPubKey)
-	if err != nil {
-		return nil, errors.WithMessage(err, "Failed to verify signed NDF message")
-	}
-
-	return signedNdfMsg.Ndf, nil
+	return api.DownloadAndVerifySignedNdfWithUrl(url, cert)
 }

cmd/root.go

@@ -34,6 +34,129 @@ import (
 	"time"
 )
 
+// Deployment environment constants for the download-ndf code path
+const (
+	mainnet = "mainnet"
+	release = "release"
+	dev     = "dev"
+	testnet = "testnet"
+)
+
+// URL constants pointing to the NDF of the associated deployment environment
+// requested for the download-ndf code path.
+const (
+	mainNetUrl = "https://elixxir-bins.s3.us-west-1.amazonaws.com/ndf/mainnet.json"
+	releaseUrl = "https://elixxir-bins.s3.us-west-1.amazonaws.com/ndf/release.json"
+	devUrl     = "https://elixxir-bins.s3.us-west-1.amazonaws.com/ndf/default.json"
+	testNetUrl = "https://elixxir-bins.s3.us-west-1.amazonaws.com/ndf/testnet.json"
+)
+
+// Certificates for deployment environments. Used to verify NDF signatures.
+const (
+	mainNetCert = `-----BEGIN CERTIFICATE-----
+MIIFqTCCA5GgAwIBAgIUO0qHXSeKrOMucO+Zz82Mf1Zlq4gwDQYJKoZIhvcNAQEL
+BQAwgYAxCzAJBgNVBAYTAktZMRQwEgYDVQQHDAtHZW9yZ2UgVG93bjETMBEGA1UE
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+UGb8k8vh6tzqYZAOKg==
+-----END CERTIFICATE-----`
+	releaseCert = `-----BEGIN CERTIFICATE-----
+MIIFtjCCA56gAwIBAgIJAJnUcpLbGSQiMA0GCSqGSIb3DQEBCwUAMIGMMQswCQYD
+VQQGEwJVUzELMAkGA1UECAwCQ0ExEjAQBgNVBAcMCUNsYXJlbW9udDEQMA4GA1UE
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+0b5cTzVKxdP6v6WOAXVOEkXTcBPZ4nEZxY0=
+-----END CERTIFICATE-----`
+	devCert     = `-----BEGIN CERTIFICATE-----
+MIIF4DCCA8igAwIBAgIUegUvihtQooWNIzsNqj6lucXn6g8wDQYJKoZIhvcNAQEL
+BQAwgYwxCzAJBgNVBAYTAlVTMQswCQYDVQQIDAJDQTESMBAGA1UEBwwJQ2xhcmVt
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+EnretBzQkeKeBwoB2u6NTiOmUjk=
+-----END CERTIFICATE-----`
+	testNetCert = ``
+)
+
+
 // Execute adds all child commands to the root command and sets flags
 // appropriately.  This is called by main.main(). It only needs to
 // happen once to the rootCmd.
@@ -388,11 +511,42 @@ func createClient() *api.Client {
 	//create a new client if none exist
 	if _, err := os.Stat(storeDir); os.IsNotExist(err) {
 		// Load NDF
-		ndfPath := viper.GetString("ndf")
-		ndfJSON, err := ioutil.ReadFile(ndfPath)
+		var ndfJSON []byte
+		if viper.GetString("ndf") != "" {
+			ndfJSON, err = ioutil.ReadFile(viper.GetString("ndf"))
+			if err != nil {
+				jww.FATAL.Panicf(err.Error())
+			}
+		} else if viper.GetString("download-ndf") != "" {
+			switch viper.GetString("download-ndf") {
+			case mainnet:
+				ndfJSON, err = api.DownloadAndVerifySignedNdfWithUrl(mainNetUrl, mainNetCert)
+				if err != nil {
+					jww.FATAL.Panicf(err.Error())
+				}
+			case release:
+				ndfJSON, err = api.DownloadAndVerifySignedNdfWithUrl(releaseUrl, releaseCert)
+				if err != nil {
+					jww.FATAL.Panicf(err.Error())
+				}
+
+			case dev:
+				ndfJSON, err = api.DownloadAndVerifySignedNdfWithUrl(devUrl, devCert)
+				if err != nil {
+					jww.FATAL.Panicf(err.Error())
+				}
+			case testnet:
+				ndfJSON, err = api.DownloadAndVerifySignedNdfWithUrl(testNetUrl, testNetCert)
 				if err != nil {
 					jww.FATAL.Panicf(err.Error())
 				}
+			default:
+				jww.FATAL.Panicf("download-ndf flag with unknown flag (%s)",
+					viper.GetString("download-ndf"))
+			}
+		} else {
+			jww.FATAL.Panicf("Unspecified NDF in CLI, cannot create client!")
+		}
 
 		if precannedID != 0 {
 			err = api.NewPrecannedClient(precannedID,
@@ -865,6 +1019,12 @@ func init() {
 	viper.BindPFlag("accept-channel",
 		rootCmd.Flags().Lookup("accept-channel"))
 
+	rootCmd.Flags().StringP("download-ndf", "", "",
+		"Downloads and verifies a signed NDF from a specified environment. "+
+			"Accepted environment flags include mainnet, release, testnet, and dev")
+	viper.BindPFlag("download-ndf",
+		rootCmd.Flags().Lookup("download-ndf"))
+
 	rootCmd.PersistentFlags().Bool("delete-channel", false,
 		"Delete the channel information for the corresponding recipient ID")
 	viper.BindPFlag("delete-channel",