first commit

utils/hash.go

@@ -0,0 +1,29 @@
+package utils
+
+import (
+	"crypto/sha256"
+	"fmt"
+)
+
+const base62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+
+func GenerateUrlHash(url string) string {
+	encoded := EncodeToBase62(url)
+	hash := sha256.Sum256([]byte(encoded))
+
+	return fmt.Sprintf("%x", hash)
+}
+
+func EncodeToBase62(url string) string {
+	hash := sha256.Sum256([]byte(url))
+
+	encoded := ""
+	for _, b := range hash[:] {
+		encoded += string(base62[int(b)%62])
+	}
+	if len(encoded) > 6 {
+		encoded = encoded[:6]
+	}
+
+	return encoded
+}