fix: warn instead of returning error on empty glob result (#1280)

Author: José Carlos Chávez

Diff for: internal/seclang/parser.go

@@ -46,12 +46,14 @@ func (p *Parser) FromFile(profilePath string) error {
 		if err != nil {
 			return fmt.Errorf("failed to glob: %s", err.Error())
 		}
+
 		if len(files) == 0 {
-			return fmt.Errorf("empty glob: %s does not match any file", profilePath)
+			p.options.WAF.Logger.Warn().Int("line", p.currentLine).Msg("empty glob result")
 		}
 	} else {
 		files = append(files, profilePath)
 	}
+
 	for _, profilePath := range files {
 		profilePath = strings.TrimSpace(profilePath)
 		if !strings.HasPrefix(profilePath, "/") {
@@ -157,20 +159,22 @@ func (p *Parser) evaluateLine(l string) error {
 	if len(opts) >= 3 && opts[0] == '"' && opts[len(opts)-1] == '"' {
 		opts = strings.Trim(opts, `"`)
 	}
+
 	if directive == "include" {
 		// this is a special hardcoded case
 		// we cannot add it as a directive type because there are recursion issues
 		// note a user might still include another file that includes the original file
 		// generating a DDOS attack
 		if p.includeCount >= maxIncludeRecursion {
-			return p.log(fmt.Sprintf("cannot include more than %d files", maxIncludeRecursion))
+			return p.logAndReturnErr(fmt.Sprintf("cannot include more than %d files", maxIncludeRecursion))
 		}
 		p.includeCount++
 		return p.FromFile(opts)
 	}
+
 	d, ok := directivesMap[directive]
 	if !ok || d == nil {
-		return p.log(fmt.Sprintf("unknown directive %q", directive))
+		return p.logAndReturnErr(fmt.Sprintf("unknown directive %q", directive))
 	}
 
 	p.options.Raw = l
@@ -194,7 +198,7 @@ func (p *Parser) evaluateLine(l string) error {
 	return nil
 }
 
-func (p *Parser) log(msg string) error {
+func (p *Parser) logAndReturnErr(msg string) error {
 	p.options.WAF.Logger.Error().Int("line", p.currentLine).Msg(msg)
 	return errors.New(msg)
 }

Diff for: internal/seclang/parser_test.go

@@ -89,25 +89,34 @@ func TestErrorWithBackticks(t *testing.T) {
 func TestLoadConfigurationFile(t *testing.T) {
 	waf := coraza.NewWAF()
 	p := NewParser(waf)
-	err := p.FromFile("../../coraza.conf-recommended")
-	if err != nil {
-		t.Errorf("unexpected error: %s", err.Error())
-	}
 
-	err = p.FromFile("../doesnotexist.conf")
-	if err == nil {
-		t.Error("expected not found error")
-	}
+	t.Run("existing file", func(t *testing.T) {
+		err := p.FromFile("../../coraza.conf-recommended")
+		if err != nil {
+			t.Errorf("unexpected error: %s", err.Error())
+		}
+	})
 
-	err = p.FromFile("./testdata/glob/*.conf")
-	if err != nil {
-		t.Errorf("unexpected error: %s", err.Error())
-	}
+	t.Run("unexisting file", func(t *testing.T) {
+		err := p.FromFile("../doesnotexist.conf")
+		if err == nil {
+			t.Error("expected not found error")
+		}
+	})
 
-	err = p.FromFile("./testdata/glob/*.comf")
-	if err == nil {
-		t.Errorf("expected an error as glob does not match any file")
-	}
+	t.Run("successful glob", func(t *testing.T) {
+		err := p.FromFile("./testdata/glob/*.conf")
+		if err != nil {
+			t.Errorf("unexpected error: %s", err.Error())
+		}
+	})
+
+	t.Run("empty glob result", func(t *testing.T) {
+		err := p.FromFile("./testdata/glob/*.comf")
+		if err != nil {
+			t.Errorf("unexpected error despite glob not matching any file")
+		}
+	})
 }
 
 // Connectors are supporting embedding github.com/corazawaf/coraza-coreruleset to ease CRS integration