feat: Add lockfile attestor

This commit introduces a new lockfiles attestor to capture and attest
the contents of common lockfiles in the project. The changes include:

- Add new file attestation/lockfiles/lockfiles.go implementing the lockfiles attestor
- Update imports.go to include the new lockfiles package

The lockfiles attestor captures contents of various lockfiles such as
Gemfile.lock, package-lock.json, yarn.lock, and others. It stores the
information in a slice of LockfileInfo structs, allowing for flexible
handling of multiple lockfiles.

This feature enhances the project's capability to track and verify
dependency information as part of the attestation process."

attestation/lockfiles/lockfiles.go

@@ -0,0 +1,98 @@
+package lockfiles
+
+import (
+	"fmt"
+	"github.com/invopop/jsonschema"
+	"os"
+	"path/filepath"
+
+	"github.com/in-toto/go-witness/attestation"
+)
+
+const (
+	Name    = "lockfiles"
+	Type    = "https://witness.dev/attestations/lockfiles/v0.1"
+	RunType = attestation.PreMaterialRunType
+)
+
+func init() {
+	attestation.RegisterAttestation(Name, Type, RunType, func() attestation.Attestor {
+		return NewLockfilesAttestor()
+	})
+}
+
+func NewLockfilesAttestor() attestation.Attestor {
+	return &Attestor{
+		Lockfiles: []LockfileInfo{},
+	}
+}
+
+// Attestor implements the lockfiles attestation type
+type Attestor struct {
+	Lockfiles []LockfileInfo `json:"lockfiles"`
+}
+
+// LockfileInfo stores information about a lockfile
+type LockfileInfo struct {
+	Filename string `json:"filename"`
+	Content  string `json:"content"`
+}
+
+// Name returns the name of the attestation type
+func (a *Attestor) Name() string {
+	return "lockfiles"
+}
+
+// Attest captures the contents of common lockfiles
+func (a *Attestor) Attest(ctx *attestation.AttestationContext) error {
+	lockfilePatterns := []string{
+		"Gemfile.lock",      // Ruby
+		"package-lock.json", // Node.js (npm)
+		"yarn.lock",         // Node.js (Yarn)
+		"Cargo.lock",        // Rust
+		"poetry.lock",       // Python (Poetry)
+		"Pipfile.lock",      // Python (Pipenv)
+		"composer.lock",     // PHP
+		"go.sum",            // Go
+		"Podfile.lock",      // iOS/macOS (CocoaPods)
+		"gradle.lockfile",   // Gradle
+		"pnpm-lock.yaml",    // Node.js (pnpm)
+	}
+
+	a.Lockfiles = []LockfileInfo{}
+
+	for _, pattern := range lockfilePatterns {
+		matches, err := filepath.Glob(pattern)
+		if err != nil {
+			return fmt.Errorf("error searching for %s: %w", pattern, err)
+		}
+
+		for _, match := range matches {
+			content, err := os.ReadFile(match)
+			if err != nil {
+				return fmt.Errorf("error reading %s: %w", match, err)
+			}
+			a.Lockfiles = append(a.Lockfiles, LockfileInfo{
+				Filename: filepath.Base(match),
+				Content:  string(content),
+			})
+		}
+	}
+
+	return nil
+}
+
+// RunType implements attestation.Attestor.
+func (o *Attestor) RunType() attestation.RunType {
+	return RunType
+}
+
+// // Schema implements attestation.Attestor.
+func (o *Attestor) Schema() *jsonschema.Schema {
+	return jsonschema.Reflect(&o)
+}
+
+// Type implements attestation.Attestor.
+func (o *Attestor) Type() string {
+	return Type
+}

attestation/lockfiles/lockfiles_test.go

@@ -0,0 +1,81 @@
+package lockfiles
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/in-toto/go-witness/attestation"
+)
+
+func TestAttestor_Attest(t *testing.T) {
+	// Create a temporary directory for test files
+	tempDir, err := os.MkdirTemp("", "lockfiles_test")
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tempDir)
+
+	// Create test lockfiles
+	testFiles := map[string]string{
+		"Gemfile.lock":      "test content for Gemfile.lock",
+		"package-lock.json": "test content for package-lock.json",
+	}
+
+	for filename, content := range testFiles {
+		err := os.WriteFile(filepath.Join(tempDir, filename), []byte(content), 0644)
+		if err != nil {
+			t.Fatalf("Failed to create test file %s: %v", filename, err)
+		}
+	}
+
+	// Change to the temp directory
+	oldWd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("Failed to get current working directory: %v", err)
+	}
+	defer os.Chdir(oldWd)
+
+	err = os.Chdir(tempDir)
+	if err != nil {
+		t.Fatalf("Failed to change to temp directory: %v", err)
+	}
+
+	// Create an Attestor and AttestationContext
+	attestor := &Attestor{}
+	ctx := &attestation.AttestationContext{}
+
+	// Run the Attest method
+	err = attestor.Attest(ctx)
+	if err != nil {
+		t.Fatalf("Attest failed: %v", err)
+	}
+
+	// Check if the lockfiles were captured correctly
+	if len(attestor.Lockfiles) != len(testFiles) {
+		t.Errorf("Expected %d lockfiles, but got %d", len(testFiles), len(attestor.Lockfiles))
+	}
+
+	for _, lockfile := range attestor.Lockfiles {
+		expectedContent, ok := testFiles[lockfile.Filename]
+		if !ok {
+			t.Errorf("Unexpected lockfile %s found in attestation", lockfile.Filename)
+		} else if lockfile.Content != expectedContent {
+			t.Errorf("Lockfile %s content mismatch. Got %s, want %s", lockfile.Filename, lockfile.Content, expectedContent)
+		}
+		delete(testFiles, lockfile.Filename)
+	}
+
+	if len(testFiles) > 0 {
+		for filename := range testFiles {
+			t.Errorf("Expected lockfile %s not found in attestation", filename)
+		}
+	}
+}
+
+func TestAttestor_Name(t *testing.T) {
+	attestor := &Attestor{}
+	if name := attestor.Name(); name != "lockfiles" {
+		t.Errorf("Incorrect attestor name. Got %s, want lockfiles", name)
+	}
+}

imports.go

@@ -27,6 +27,7 @@ import (
 	_ "github.com/in-toto/go-witness/attestation/jenkins"
 	_ "github.com/in-toto/go-witness/attestation/jwt"
 	_ "github.com/in-toto/go-witness/attestation/link"
+	_ "github.com/in-toto/go-witness/attestation/lockfiles"
 	_ "github.com/in-toto/go-witness/attestation/material"
 	_ "github.com/in-toto/go-witness/attestation/maven"
 	_ "github.com/in-toto/go-witness/attestation/oci"