fix(secret): use only line with secret for long secret lines (#7412)

pkg/fanal/secret/scanner.go

@@ -504,8 +504,8 @@ func findLocation(start, end int, content []byte) (int, int, types.Code, string)
 	}
 
 	if lineEnd-lineStart > 100 {
-		lineStart = lo.Ternary(start-30 < 0, 0, start-30)
-		lineEnd = lo.Ternary(end+20 > len(content), len(content), end+20)
+		lineStart = lo.Ternary(start-lineStart-30 < 0, lineStart, start-30)
+		lineEnd = lo.Ternary(end+20 > lineEnd, lineEnd, end+20)
 	}
 	matchLine := string(content[lineStart:lineEnd])
 	endLineNum := startLineNum + bytes.Count(content[start:end], lineSep)

pkg/fanal/secret/scanner_test.go

@@ -742,6 +742,42 @@ func TestSecretScanner(t *testing.T) {
 			},
 		},
 	}
+	wantFindingJWT := types.SecretFinding{
+		RuleID:    "jwt-token",
+		Category:  "JWT",
+		Title:     "JWT token",
+		Severity:  "MEDIUM",
+		StartLine: 3,
+		EndLine:   3,
+		Match:     "jwt: ***********************************************************************************************************************************************************",
+		Code: types.Code{
+			Lines: []types.Line{
+				{
+					Number:      1,
+					Content:     "asd",
+					Highlighted: "asd",
+				},
+				{
+					Number:      2,
+					Content:     "aaaa",
+					Highlighted: "aaaa",
+				},
+				{
+					Number:      3,
+					Content:     "jwt: ***********************************************************************************************************************************************************",
+					Highlighted: "jwt: ***********************************************************************************************************************************************************",
+					IsCause:     true,
+					FirstCause:  true,
+					LastCause:   true,
+				},
+				{
+					Number:      4,
+					Content:     "asda",
+					Highlighted: "asda",
+				},
+			},
+		},
+	}
 
 	tests := []struct {
 		name          string
@@ -822,6 +858,15 @@ func TestSecretScanner(t *testing.T) {
 				Findings: []types.SecretFinding{wantFindingHuggingFace},
 			},
 		},
+		{
+			name:          "find JWT token",
+			configPath:    filepath.Join("testdata", "config.yaml"),
+			inputFilePath: filepath.Join("testdata", "jwt-secret.txt"),
+			want: types.Secret{
+				FilePath: filepath.Join("testdata", "jwt-secret.txt"),
+				Findings: []types.SecretFinding{wantFindingJWT},
+			},
+		},
 		{
 			name:          "include when keyword found",
 			configPath:    filepath.Join("testdata", "config-happy-keywords.yaml"),

pkg/fanal/secret/testdata/jwt-secret.txt

@@ -0,0 +1,4 @@
+asd
+aaaa
+jwt: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
+asda