Fix json filename generation (#2887)

pkg/fsutil/file.go

@@ -5,6 +5,7 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+	"regexp"
 	"strings"
 )
 
@@ -116,3 +117,25 @@ func Touch(path string) error {
 	}
 	return nil
 }
+
+var (
+	replaceCharsRE = regexp.MustCompile(`[&=\\/:*"?_ ]`)
+	removeCharsRE  = regexp.MustCompile(`[^[:alnum:]-.]`)
+	multiHyphenRE  = regexp.MustCompile(`\-+`)
+)
+
+// SanitiseBasename returns a file basename removing any characters that are illegal or problematic to use in the filesystem.
+func SanitiseBasename(v string) string {
+	v = strings.TrimSpace(v)
+
+	// replace illegal filename characters with -
+	v = replaceCharsRE.ReplaceAllString(v, "-")
+
+	// remove other characters
+	v = removeCharsRE.ReplaceAllString(v, "")
+
+	// remove multiple hyphens
+	v = multiHyphenRE.ReplaceAllString(v, "-")
+
+	return strings.TrimSpace(v)
+}

pkg/fsutil/file_test.go

@@ -0,0 +1,26 @@
+package fsutil
+
+import "testing"
+
+func TestSanitiseBasename(t *testing.T) {
+	tests := []struct {
+		name string
+		v    string
+		want string
+	}{
+		{"basic", "basic", "basic"},
+		{"spaces", `spaced name`, "spaced-name"},
+		{"leading/trailing spaces", `  spaced name  `, "spaced-name"},
+		{"hyphen name", `hyphened-name`, "hyphened-name"},
+		{"multi-hyphen", `hyphened--name`, "hyphened-name"},
+		{"replaced characters", `a&b=c\d/:e*"f?_ g`, "a-b-c-d-e-f-g"},
+		{"removed characters", `foo!!bar@@and, more`, "foobarand-more"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := SanitiseBasename(tt.v); got != tt.want {
+				t.Errorf("SanitiseBasename() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}