Add support for http-path

multiaddr_test.go

@@ -192,6 +192,11 @@ var good = []string{
 	"/ip4/127.0.0.1/tcp/127/wss",
 	"/ip4/127.0.0.1/tcp/127/webrtc-direct",
 	"/ip4/127.0.0.1/tcp/127/webrtc",
+	"/http-path/tmp%2Fbar",
+	"/http-path/tmp%2Fbar%2Fbaz",
+	"/http-path/foo",
+	"/ip4/127.0.0.1/tcp/0/p2p/12D3KooWCryG7Mon9orvQxcS1rYZjotPgpwoJNHHKcLLfE4Hf5mV/http-path/foo",
+	"/ip4/127.0.0.1/tcp/443/tls/sni/example.com/http/http-path/foo",
 }
 
 func TestConstructSucceeds(t *testing.T) {
@@ -627,6 +632,7 @@ func TestRoundTrip(t *testing.T) {
 		"/ip4/127.0.0.1/udp/1234/quic-v1/webtransport/certhash/uEiDDq4_xNyDorZBH3TlGazyJdOWSwvo4PUo5YHFMrvDE8g",
 		"/p2p/QmbHVEEepCi7rn7VL7Exxpd2Ci9NNB6ifvqwhsrbRMgQFP",
 		"/p2p/QmbHVEEepCi7rn7VL7Exxpd2Ci9NNB6ifvqwhsrbRMgQFP/unix/a/b/c",
+		"/http-path/tmp%2Fbar",
 	} {
 		ma, err := NewMultiaddr(s)
 		if err != nil {
@@ -923,3 +929,48 @@ func TestDNS(t *testing.T) {
 		t.Fatal("expected equality")
 	}
 }
+
+func TestHTTPPath(t *testing.T) {
+	t.Run("bad addr", func(t *testing.T) {
+		badAddr := "/http-path/thisIsMissingAfullByte%f"
+		_, err := NewMultiaddr(badAddr)
+		require.Error(t, err)
+	})
+
+	t.Run("only reads the http-path part", func(t *testing.T) {
+		addr := "/http-path/tmp%2Fbar/p2p-circuit" // The http-path only reference the part immediately after it. It does not include the rest of the multiaddr (like the /path component sometimes does)
+		m, err := NewMultiaddr(addr)
+		require.NoError(t, err)
+		m.ValueForProtocol(P_HTTP_PATH)
+		v, err := m.ValueForProtocol(P_HTTP_PATH)
+		require.NoError(t, err)
+		require.Equal(t, "tmp%2Fbar", v)
+	})
+
+	t.Run("round trip", func(t *testing.T) {
+		cases := []string{
+			"/http-path/tmp%2Fbar",
+			"/http-path/tmp%2Fbar%2Fbaz",
+			"/http-path/foo",
+			"/ip4/127.0.0.1/tcp/0/p2p/12D3KooWCryG7Mon9orvQxcS1rYZjotPgpwoJNHHKcLLfE4Hf5mV/http-path/foo",
+			"/ip4/127.0.0.1/tcp/443/tls/sni/example.com/http/http-path/foo",
+		}
+		for _, c := range cases {
+			m, err := NewMultiaddr(c)
+			require.NoError(t, err)
+			require.Equal(t, c, m.String())
+		}
+	})
+
+	t.Run("value for protocol", func(t *testing.T) {
+		m := StringCast("/http-path/tmp%2Fbar")
+		v, err := m.ValueForProtocol(P_HTTP_PATH)
+		require.NoError(t, err)
+		// This gives us the url escaped version
+		require.Equal(t, "tmp%2Fbar", v)
+
+		// If we want the raw unescaped version, we can use the component and read it
+		_, component := SplitLast(m)
+		require.Equal(t, "tmp/bar", string(component.RawValue()))
+	})
+}

protocols.go

@@ -26,6 +26,7 @@ const (
 	P_P2P               = 421
 	P_IPFS              = P_P2P // alias for backwards compatibility
 	P_HTTP              = 480
+	P_HTTP_PATH         = 481
 	P_HTTPS             = 443 // deprecated alias for /tls/http
 	P_ONION             = 444 // also for backwards compatibility
 	P_ONION3            = 445
@@ -206,6 +207,13 @@ var (
 		Code:  P_HTTP,
 		VCode: CodeToVarint(P_HTTP),
 	}
+	protoHTTPPath = Protocol{
+		Name:       "http-path",
+		Code:       P_HTTP_PATH,
+		VCode:      CodeToVarint(P_HTTP_PATH),
+		Size:       LengthPrefixedVarSize,
+		Transcoder: TranscoderHTTPPath,
+	}
 	protoHTTPS = Protocol{
 		Name:  "https",
 		Code:  P_HTTPS,
@@ -301,6 +309,7 @@ func init() {
 		protoWEBTRANSPORT,
 		protoCERTHASH,
 		protoHTTP,
+		protoHTTPPath,
 		protoHTTPS,
 		protoP2P,
 		protoUNIX,

transcoders.go

@@ -8,6 +8,7 @@
 	"errors"
 	"fmt"
 	"net"
+	"net/url"
 	"strconv"
 	"strings"
 
@@ -454,3 +455,30 @@
 	_, err := mh.Decode(b)
 	return err
 }
+
+var TranscoderHTTPPath = NewTranscoderFromFunctions(httpPathStB, httpPathBtS, validateHTTPPath)
+
+func httpPathStB(s string) ([]byte, error) {
+	unescaped, err := url.QueryUnescape(s)
+	if err != nil {
+		return nil, err
+	}
+	if len(unescaped) == 0 {
+		return nil, fmt.Errorf("empty http path is not allowed")
+	}
+	return []byte(unescaped), err
+}
+
+func httpPathBtS(b []byte) (string, error) {
+	if len(b) == 0 {
+		return "", fmt.Errorf("empty http path is not allowed")
+	}
+	return url.QueryEscape(string(b)), nil
+}
+
+func validateHTTPPath(b []byte) error {
+	if len(b) == 0 {
+		return fmt.Errorf("empty http path is not allowed")
+	}
+	return nil // We can represent any byte slice when we escape it.
+}