From e3c33d25aca7fc4fa2b3a581118babde38ec3b83 Mon Sep 17 00:00:00 2001
From: Reza Behzadan <rbehzadan@gmail.com>
Date: Sun, 25 Feb 2024 02:50:36 +0330
Subject: [PATCH] Add 'genpw' custom function

---
 VERSION                |  2 +-
 functions/functions.go |  1 +
 functions/security.go  | 35 +++++++++++++++++++++++++++++++++++
 samples/hello.go.tmpl  |  1 +
 4 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 functions/security.go

diff --git a/VERSION b/VERSION
index 31e5c84..347f583 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.3.3
+1.4.1
diff --git a/functions/functions.go b/functions/functions.go
index 85d7dbc..76181bc 100644
--- a/functions/functions.go
+++ b/functions/functions.go
@@ -8,6 +8,7 @@ func FuncMap() template.FuncMap {
 		"title":  Title,
 		"split":  Split,
 		"domain": GetDomainName,
+		"genpw":  GenPassword,
 	}
 
 }
diff --git a/functions/security.go b/functions/security.go
new file mode 100644
index 0000000..9db9b44
--- /dev/null
+++ b/functions/security.go
@@ -0,0 +1,35 @@
+package functions
+
+import (
+	"crypto/rand"
+	"fmt"
+)
+
+// genpw generates a random password of the given length.
+// It uses a predefined set of characters to ensure the password is readable.
+func genpw(length int) (string, error) {
+	// Define a set of characters to use in the password.
+	// You can adjust the character set to meet your password policy requirements.
+	const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()"
+
+	b := make([]byte, length) // Create a slice of bytes to store the password characters
+	_, err := rand.Read(b)    // Fill the slice with random bytes
+	if err != nil {
+		return "", fmt.Errorf("error generating random bytes: %v", err)
+	}
+
+	password := make([]byte, length)
+	for i, byteVal := range b {
+		password[i] = charset[byteVal%byte(len(charset))] // Map each byte to a character in the charset
+	}
+
+	return string(password), nil // Convert the password slice to a string and return it
+}
+
+func GenPassword(length int) string {
+	pw, err := genpw(length)
+	if err != nil {
+		return "7HQO0LfNL;={i,4@0Tz/]2#EC"
+	}
+	return pw
+}
diff --git a/samples/hello.go.tmpl b/samples/hello.go.tmpl
index 417a5a6..71755f5 100644
--- a/samples/hello.go.tmpl
+++ b/samples/hello.go.tmpl
@@ -1 +1,2 @@
 Domain is: "{{domain}}"
+Password is: "{{genpw 32}}"