Added db configurations and Dockerfile

internal/utils/fingerprint.go

@@ -0,0 +1,57 @@
+package utils
+
+import (
+	"crypto/sha1"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+// CalculateFingerprint calculates the fingerprint (SHA-1 hash) of a file at a given path.
+//
+// This function computes a SHA-1 hash for the contents of a file. It opens the file, reads it in chunks
+// to avoid loading the entire file into memory, and then calculates the hash using the SHA-1 algorithm.
+// Finally, it returns the resulting hash as a hexadecimal string.
+//
+// Parameters:
+//   - filePath (string): The path to the file whose fingerprint (hash) is to be calculated.
+//
+// Returns:
+//   - string: The SHA-1 hash of the file, represented as a hexadecimal string.
+//   - error: Any error encountered while opening the file, reading it, or calculating the hash.
+//     If no error occurred, it returns nil.
+//
+// Example usage:
+//
+//	fingerprint, err := utils.CalculateFingerprint("/path/to/file.txt")
+//	if err != nil {
+//	    log.Fatalf("Error calculating fingerprint: %v", err)
+//	}
+//	fmt.Printf("Fingerprint: %s\n", fingerprint)
+func CalculateFingerprint(filePath string) (string, error) {
+	// Open the file at the specified file path.
+	file, err := os.Open(filePath)
+	if err != nil {
+		return "", fmt.Errorf("failed to open file: %v", err)
+	}
+	// Ensure that the file is closed after processing (using a defer statement).
+	defer func(file *os.File) {
+		err := file.Close()
+		if err != nil {
+			log.Fatalf("failed to close file: %v", err)
+		}
+	}(file)
+
+	// Create a new SHA-1 hash object.
+	hash := sha1.New()
+
+	// Read the file and calculate the hash while reading. The entire file is not loaded into memory.
+	_, err = io.Copy(hash, file)
+	if err != nil {
+		return "", fmt.Errorf("failed to calculate hash: %v", err)
+	}
+
+	// Return the final hash as a hexadecimal string.
+	return fmt.Sprintf("%x", hash.Sum(nil)), nil
+}