Fix gosec security error.

helper/README.md

@@ -152,7 +152,7 @@ fmt.Println(actual) // [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
 ```
 
 <a name="AppendOrWriteToCsvFile"></a>
-## func [AppendOrWriteToCsvFile](<https://github.com/cinar/indicator/blob/v2/helper/csv.go#L285>)
+## func [AppendOrWriteToCsvFile](<https://github.com/cinar/indicator/blob/v2/helper/csv.go#L294>)
 
 ```go
 func AppendOrWriteToCsvFile[T any](fileName string, hasHeader bool, rows <-chan *T) error
@@ -553,7 +553,7 @@ fmt.Println(helper.ChanToSlice(squared)) // [4, 9, 25, 100]
 ```
 
 <a name="ReadFromCsvFile"></a>
-## func [ReadFromCsvFile](<https://github.com/cinar/indicator/blob/v2/helper/csv.go#L272>)
+## func [ReadFromCsvFile](<https://github.com/cinar/indicator/blob/v2/helper/csv.go#L281>)
 
 ```go
 func ReadFromCsvFile[T any](fileName string, hasHeader bool) (<-chan *T, error)

helper/csv.go

@@ -168,13 +168,13 @@ func (c *Csv[T]) ReadFromFile(fileName string) (<-chan *T, error) {
 // file's column order matches the field order of the given row struct to ensure consistent
 // data structure.
 func (c *Csv[T]) AppendToFile(fileName string, rows <-chan *T) error {
-	return c.writeToFileWithFlag(fileName, os.O_APPEND, rows)
+	return c.writeToFileWithFlag(fileName, true, rows)
 }
 
 // WriteToFile creates a new file with the given name and writes the provided rows
 // of data to it, overwriting any existing content.
 func (c *Csv[T]) WriteToFile(fileName string, rows <-chan *T) error {
-	return c.writeToFileWithFlag(fileName, os.O_CREATE, rows)
+	return c.writeToFileWithFlag(fileName, false, rows)
 }
 
 // updateColumnIndexes aligns column indices to match the order of column headers.
@@ -203,13 +203,22 @@ func (c *Csv[T]) updateColumnIndexes(csvReader *csv.Reader) error {
 
 // writeToFileWithFlag writes the provided rows of data to a file with the given name, using the
 // specified flag mode for precise control over file opening and writing behavior.
-func (c *Csv[T]) writeToFileWithFlag(fileName string, flag int, rows <-chan *T) error {
-	file, err := os.OpenFile(filepath.Clean(fileName), flag|os.O_WRONLY, 0600)
+func (c *Csv[T]) writeToFileWithFlag(fileName string, appendRows bool, rows <-chan *T) error {
+	var file *os.File
+	var err error
+
+	// Gosec complains if flag is a variable.
+	if appendRows {
+		file, err = os.OpenFile(filepath.Clean(fileName), os.O_APPEND|os.O_WRONLY, 0600)
+	} else {
+		file, err = os.OpenFile(filepath.Clean(fileName), os.O_CREATE|os.O_WRONLY, 0600)
+	}
+
 	if err != nil {
 		return err
 	}
 
-	writeHeader := c.hasHeader && (flag == os.O_CREATE)
+	writeHeader := c.hasHeader && !appendRows
 
 	err = c.writeToWriter(file, writeHeader, rows)
 	if err != nil {

pre-commit.sh

@@ -3,11 +3,12 @@
 (command -v revive) || go install github.com/mgechev/revive@latest
 (command -v staticcheck) || go install honnef.co/go/tools/cmd/staticcheck@latest
 (command -v gomarkdoc) || go install github.com/princjef/gomarkdoc/cmd/gomarkdoc@latest
-
+(command -v gosec) || go install github.com/securego/gosec/v2/cmd/gosec@latest
 go fmt ./...
 go fix ./...
 go vet ./...
 go test -cover ./...
+gosec ./...
 
 revive -config=revive.toml ./...
 staticcheck ./...