Share artifact declaration validation

internal/artifact/artifact.go

@@ -90,3 +90,30 @@ func ExpectedBuild(binaryName, version string, targets []Target) []Declaration {
 	}
 	return declarations
 }
+
+// ValidateDeclarations matches recorded artifact identities to selected targets.
+func ValidateDeclarations(binaryName, version string, targets []Target, recorded []Declaration) error {
+	if len(recorded) != len(targets) {
+		return fmt.Errorf("artifact and target counts do not match")
+	}
+	want := make(map[Target]string, len(targets))
+	for _, declaration := range ExpectedBuild(binaryName, version, targets) {
+		target := declaration.Target
+		if !ValidComponent(target.OS) || !ValidComponent(target.Arch) {
+			return fmt.Errorf("invalid target %q/%q", target.OS, target.Arch)
+		}
+		if _, exists := want[target]; exists {
+			return fmt.Errorf("repeats target %q/%q", target.OS, target.Arch)
+		}
+		want[target] = declaration.Filename
+	}
+	seen := make(map[Target]bool, len(recorded))
+	for _, declaration := range recorded {
+		name, ok := want[declaration.Target]
+		if !ok || seen[declaration.Target] || declaration.Filename != name {
+			return fmt.Errorf("artifact %q does not match a selected target and its declared name", declaration.Filename)
+		}
+		seen[declaration.Target] = true
+	}
+	return nil
+}

internal/artifact/artifact_test.go

@@ -56,3 +56,31 @@ func TestValidComponentPreservesBuildAndReceiptRules(t *testing.T) {
 		}
 	}
 }
+
+func TestValidateDeclarationsMatchesTargetsAndNames(t *testing.T) {
+	linux := Target{OS: "linux", Arch: "amd64"}
+	windows := Target{OS: "windows", Arch: "arm64"}
+	first := Declaration{Target: linux, Filename: "app-v1.2.3-linux-amd64"}
+	second := Declaration{Target: windows, Filename: "app-v1.2.3-windows-arm64.exe"}
+	for _, test := range []struct {
+		name     string
+		targets  []Target
+		recorded []Declaration
+		valid    bool
+	}{
+		{"reordered", []Target{linux, windows}, []Declaration{second, first}, true},
+		{"count", []Target{linux, windows}, []Declaration{first}, false},
+		{"duplicate target", []Target{linux, linux}, []Declaration{first, first}, false},
+		{"duplicate artifact", []Target{linux, windows}, []Declaration{first, first}, false},
+		{"incorrect name", []Target{linux}, []Declaration{{Target: linux, Filename: "other"}}, false},
+		{"unknown target", []Target{linux}, []Declaration{second}, false},
+		{"unsafe target", []Target{{OS: "linux/other", Arch: "amd64"}}, []Declaration{{Target: linux, Filename: first.Filename}}, false},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			err := ValidateDeclarations("app", "v1.2.3", test.targets, test.recorded)
+			if (err == nil) != test.valid {
+				t.Fatalf("ValidateDeclarations() error = %v, valid = %t", err, test.valid)
+			}
+		})
+	}
+}