Adapt to signer v0.5.0 SignedArtifact interface (#405)

Signed-off-by: Adolfo García Veytia (Puerco) <puerco@carabiner.dev>

Author: puerco

go.mod

@@ -5,7 +5,7 @@ go 1.25.11
 require (
 	github.com/carabiner-dev/attestation v0.2.1
 	github.com/carabiner-dev/collector v0.3.5
-	github.com/carabiner-dev/signer v0.4.5
+	github.com/carabiner-dev/signer v0.5.0
 	github.com/carabiner-dev/vcslocator v0.4.4
 	github.com/fatih/color v1.19.0
 	github.com/go-git/go-billy/v5 v5.9.0
@@ -34,6 +34,7 @@ require (
 	github.com/avast/retry-go/v4 v4.7.0 // indirect
 	github.com/blang/semver v3.5.1+incompatible // indirect
 	github.com/blang/semver/v4 v4.0.0 // indirect
+	github.com/carabiner-dev/command v0.3.1 // indirect
 	github.com/carabiner-dev/ghrfs v0.3.4 // indirect
 	github.com/carabiner-dev/github v0.2.3 // indirect
 	github.com/carabiner-dev/hasher v0.2.4 // indirect
@@ -138,8 +139,9 @@ require (
 	github.com/skeema/knownhosts v1.3.2 // indirect
 	github.com/spdx/tools-golang v0.5.7 // indirect
 	github.com/spf13/pflag v1.0.10 // indirect
+	github.com/spiffe/go-spiffe/v2 v2.7.0 // indirect
 	github.com/theupdateframework/go-tuf v0.7.0 // indirect
-	github.com/theupdateframework/go-tuf/v2 v2.4.2-0.20260407074541-7e8f69f906ef // indirect
+	github.com/theupdateframework/go-tuf/v2 v2.4.2 // indirect
 	github.com/transparency-dev/formats v0.1.1 // indirect
 	github.com/transparency-dev/merkle v0.0.2 // indirect
 	github.com/ulikunitz/xz v0.5.15 // indirect

go.sum

@@ -92,6 +92,8 @@ github.com/carabiner-dev/attestation v0.2.1 h1:VhjV5YlO9TsW50Sr/Zd54bdbZhhDAqgxC
 github.com/carabiner-dev/attestation v0.2.1/go.mod h1:O84vF84RZG3pJO/6BYrPs718bZviHF5DKajP1HsrDpw=
 github.com/carabiner-dev/collector v0.3.5 h1:D7cKPyjLl69yLqeeQHVwd5fR6YhvudMNEFOmLQgFg1o=
 github.com/carabiner-dev/collector v0.3.5/go.mod h1:WgoEaH6peXynITtICYvoPLRfLYgmWIZbkx8LVgj1wvM=
+github.com/carabiner-dev/command v0.3.1 h1:iBkh+AjwziFZmyihv/izypCV74nkmaslZxb5AgP7GP4=
+github.com/carabiner-dev/command v0.3.1/go.mod h1:0mWfS5BU/krtaI1hgD5wjmLpjWVlf38KY8usA8zfF5c=
 github.com/carabiner-dev/ghrfs v0.3.4 h1:XJoDXkuw+8KQPTC4oI0da8vLpnx7cfQBGgyjzo+Eqrc=
 github.com/carabiner-dev/ghrfs v0.3.4/go.mod h1:u9We7molIUX6sCe4ox70juKOnbNAUpDv+B5Cerbqhio=
 github.com/carabiner-dev/github v0.2.3 h1:sky7HXTrgbk9G9gEWBmIeCExprHdnZvKOsFW1bUZXqc=
@@ -110,8 +112,8 @@ github.com/carabiner-dev/predicates v0.5.0 h1:CG2xO5xTXWXakjJkAFuS2xSA2olP9Ew25k
 github.com/carabiner-dev/predicates v0.5.0/go.mod h1:EUm2p0CwKoUuc+OLbGkoxLdRqBrg/r957b8iN/ACWSA=
 github.com/carabiner-dev/sbomfs v0.1.0 h1:gEsmn85hod7JTLs2dDr5C1x4Af7FUEhI0lbTurNaEZs=
 github.com/carabiner-dev/sbomfs v0.1.0/go.mod h1:UyPyTSNx9JOLZVgTmM9WXdmgVqDWXCYwr1LK1Ts+7H0=
-github.com/carabiner-dev/signer v0.4.5 h1:H3XHHqorZw7wvLysbGCc+FM90nSdzFlODj+mIGMsYJc=
-github.com/carabiner-dev/signer v0.4.5/go.mod h1:B/53ToJAIgwM+KuDwj52+HwnlA5p8Rmz2OXQdy9x+xs=
+github.com/carabiner-dev/signer v0.5.0 h1:F0w5+SBzCIY48JSyPU5vavq9hWu8U49bMdAR9pFPQxs=
+github.com/carabiner-dev/signer v0.5.0/go.mod h1:QSdF3/d+MqKehGQMw8NYSVa1vIm4cZ32bJ4smcV8PTw=
 github.com/carabiner-dev/vcslocator v0.4.4 h1:5uzb2yKfslMHY9RkkpUW28jLx2iVX93Al/GjSvG/2Ok=
 github.com/carabiner-dev/vcslocator v0.4.4/go.mod h1:qfYEs44nf9Fm/kiN120rTgruJn7PoHQyLXWQ9aO+SwE=
 github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
@@ -449,6 +451,8 @@ github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiT
 github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
 github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/spiffe/go-spiffe/v2 v2.7.0 h1:uXe1MflJoHw58wAUvxVlcM7WpKtijWG7I1UidcGh6g4=
+github.com/spiffe/go-spiffe/v2 v2.7.0/go.mod h1:47Q0Q9/AqGha8QLHp+kxpH4Wca7X7EnOtlIJy3mxZ3U=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
@@ -461,8 +465,8 @@ github.com/terminalstatic/go-xsd-validate v0.1.6 h1:TenYeQ3eY631qNi1/cTmLH/s2slH
 github.com/terminalstatic/go-xsd-validate v0.1.6/go.mod h1:18lsvYFofBflqCrvo1umpABZ99+GneNTw2kEEc8UPJw=
 github.com/theupdateframework/go-tuf v0.7.0 h1:CqbQFrWo1ae3/I0UCblSbczevCCbS31Qvs5LdxRWqRI=
 github.com/theupdateframework/go-tuf v0.7.0/go.mod h1:uEB7WSY+7ZIugK6R1hiBMBjQftaFzn7ZCDJcp1tCUug=
-github.com/theupdateframework/go-tuf/v2 v2.4.2-0.20260407074541-7e8f69f906ef h1:jJac5InhEfD0Z46/d5RayZjoavf/se7bPZpOgg8GLrM=
-github.com/theupdateframework/go-tuf/v2 v2.4.2-0.20260407074541-7e8f69f906ef/go.mod h1:cLUSJ2cgR194lNWfp+TJT4P8PX7qGleCXdudqlCMtOE=
+github.com/theupdateframework/go-tuf/v2 v2.4.2 h1:w7976/W8uTwlsegP5nRymlpjPgrwSh+AXUf85is6nJk=
+github.com/theupdateframework/go-tuf/v2 v2.4.2/go.mod h1:JqBrIUnNLAaNq/8GmBcEMFWfAFBbqp/MkJEJseXKbks=
 github.com/tink-crypto/tink-go-awskms/v3 v3.0.0 h1:XSohRhCkXAVI0iaCnWB/GS05TEmpnKurQmzaY1jzt3Y=
 github.com/tink-crypto/tink-go-awskms/v3 v3.0.0/go.mod h1:+7MXsShLzVbSQ6dI0Pe4JuZM52jD1jQ1itAygd/MDsA=
 github.com/tink-crypto/tink-go-gcpkms/v2 v2.2.0 h1:3B9i6XBXNTRspfkTC0asN5W0K6GhOSgcujNiECNRNb0=

pkg/attest/sign.go

@@ -4,23 +4,26 @@
 package attest
 
 import (
+	"bytes"
+
 	"github.com/carabiner-dev/signer"
 	"github.com/carabiner-dev/signer/options"
-	"google.golang.org/protobuf/encoding/protojson"
 )
 
 func Sign(data string) (string, error) {
-	bundle, err := signer.NewSigner().SignStatement(
+	artifact, err := signer.NewSigner().SignStatement(
 		[]byte(data), options.WithPayloadType("application/vnd.in-toto+json"),
 	)
 	if err != nil {
 		return "", err
 	}
 
-	json, err := protojson.Marshal(bundle)
-	if err != nil {
+	// SignStatement returns a polymorphic SignedArtifact; WriteTo emits its
+	// canonical JSON serialization (a sigstore bundle for the default backend).
+	var buf bytes.Buffer
+	if _, err := artifact.WriteTo(&buf); err != nil {
 		return "", err
 	}
 
-	return string(json), nil
+	return buf.String(), nil
 }