Enable certificate.go for WASM builds

Go WASM interop supports x509, PEM and other cryptography functions
(but not all), so there is no reason not to include those in
the wasm build.

This will also fix compilation errors for when something is
using webrtc and targets both wasm and server

The PR was tested locally (via a simple web folder with wasm_exec.js
and index.html) and I confirmed being able to generate a X509
certificate

certificate.go

@@ -1,9 +1,6 @@
 // SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
 // SPDX-License-Identifier: MIT
 
-//go:build !js
-// +build !js
-
 package webrtc
 
 import (

certificate_js_test.go

@@ -0,0 +1,174 @@
+//go:build js && wasm
+// +build js,wasm
+
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package webrtc
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/pem"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGenerateCertificateRSA(t *testing.T) {
+	sk, err := rsa.GenerateKey(rand.Reader, 2048)
+	assert.Nil(t, err)
+
+	skPEM := pem.EncodeToMemory(&pem.Block{
+		Type:  "RSA PRIVATE KEY",
+		Bytes: x509.MarshalPKCS1PrivateKey(sk),
+	})
+
+	cert, err := GenerateCertificate(sk)
+	assert.Nil(t, err)
+
+	certPEM := pem.EncodeToMemory(&pem.Block{
+		Type:  "CERTIFICATE",
+		Bytes: cert.x509Cert.Raw,
+	})
+
+	_, err = tls.X509KeyPair(certPEM, skPEM)
+	assert.Nil(t, err)
+}
+
+func TestGenerateCertificateECDSA(t *testing.T) {
+	sk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	assert.Nil(t, err)
+
+	skDER, err := x509.MarshalECPrivateKey(sk)
+	assert.Nil(t, err)
+
+	skPEM := pem.EncodeToMemory(&pem.Block{
+		Type:  "EC PRIVATE KEY",
+		Bytes: skDER,
+	})
+
+	cert, err := GenerateCertificate(sk)
+	assert.Nil(t, err)
+
+	certPEM := pem.EncodeToMemory(&pem.Block{
+		Type:  "CERTIFICATE",
+		Bytes: cert.x509Cert.Raw,
+	})
+
+	_, err = tls.X509KeyPair(certPEM, skPEM)
+	assert.Nil(t, err)
+}
+
+func TestGenerateCertificateEqual(t *testing.T) {
+	sk1, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	assert.Nil(t, err)
+
+	sk3, err := rsa.GenerateKey(rand.Reader, 2048)
+	assert.NoError(t, err)
+
+	cert1, err := GenerateCertificate(sk1)
+	assert.Nil(t, err)
+
+	sk2, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	assert.Nil(t, err)
+
+	cert2, err := GenerateCertificate(sk2)
+	assert.Nil(t, err)
+
+	cert3, err := GenerateCertificate(sk3)
+	assert.NoError(t, err)
+
+	assert.True(t, cert1.Equals(*cert1))
+	assert.False(t, cert1.Equals(*cert2))
+	assert.True(t, cert3.Equals(*cert3))
+}
+
+func TestGenerateCertificateExpires(t *testing.T) {
+	sk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	assert.Nil(t, err)
+
+	cert, err := GenerateCertificate(sk)
+	assert.Nil(t, err)
+
+	now := time.Now()
+	assert.False(t, cert.Expires().IsZero() || now.After(cert.Expires()))
+
+	x509Cert := CertificateFromX509(sk, &x509.Certificate{})
+	assert.NotNil(t, x509Cert)
+	assert.Contains(t, x509Cert.statsID, "certificate")
+}
+
+func TestPEM(t *testing.T) {
+	sk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	assert.Nil(t, err)
+	cert, err := GenerateCertificate(sk)
+	assert.Nil(t, err)
+
+	pem, err := cert.PEM()
+	assert.Nil(t, err)
+	cert2, err := CertificateFromPEM(pem)
+	assert.Nil(t, err)
+	pem2, err := cert2.PEM()
+	assert.Nil(t, err)
+	assert.Equal(t, pem, pem2)
+}
+
+const (
+	certHeader = `!! This is a test certificate: Don't use it in production !!
+You can create your own using openssl
+` + "```sh" + `
+openssl req -new -sha256 -newkey ec -pkeyopt ec_paramgen_curve:prime256v1 ` +
+		`-x509 -nodes -days 365 -out cert.pem -keyout cert.pem -subj "/CN=WebRTC"
+openssl x509 -in cert.pem -noout -fingerprint -sha256
+` + "```\n"
+
+	certPriv = `-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg2XFaTNqFpTUqNtG9
+A21MEe04JtsWVpUTDD8nI0KvchKhRANCAAS1nqME3jS5GFicwYfGDYaz7oSINwWm
+X4BkfsSCxMrhr7mPtfxOi4Lxy/P3w6EvSSEU8t5E9ouKIWh5xPS9dYwu
+-----END PRIVATE KEY-----
+`
+
+	certCert = `-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+`
+)
+
+func TestOpensslCert(t *testing.T) {
+	// Check that CertificateFromPEM can parse certificates with the PRIVATE KEY before the CERTIFICATE block
+	_, err := CertificateFromPEM(certHeader + certPriv + certCert)
+	assert.Nil(t, err)
+}
+
+func TestEmpty(t *testing.T) {
+	cert, err := CertificateFromPEM("")
+	assert.Nil(t, cert)
+	assert.Equal(t, errCertificatePEMMissing, err)
+}
+
+func TestMultiCert(t *testing.T) {
+	cert, err := CertificateFromPEM(certHeader + certCert + certPriv + certCert)
+	assert.Nil(t, cert)
+	assert.Equal(t, errCertificatePEMMultipleCert, err)
+}
+
+func TestMultiPriv(t *testing.T) {
+	cert, err := CertificateFromPEM(certPriv + certHeader + certCert + certPriv)
+	assert.Nil(t, cert)
+	assert.Equal(t, errCertificatePEMMultiplePriv, err)
+}

configuration_js.go

@@ -36,4 +36,6 @@ type Configuration struct {
 
 	// ICECandidatePoolSize describes the size of the prefetched ICE pool.
 	ICECandidatePoolSize uint8
+
+	Certificates []Certificate `json:"certificates,omitempty"`
 }