From f6c7df9fe5fbc0dfe650698d9d5c30113f3f0407 Mon Sep 17 00:00:00 2001
From: Ilya Shumeyko <ilya@shuma.ru>
Date: Tue, 12 May 2020 22:55:38 +0300
Subject: [PATCH] Add Faker.String.hexadecimal/1

---
 CHANGELOG.md        |  1 +
 lib/faker/string.ex | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39a583528..f8e6694af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ Change log itself follows [Keep a CHANGELOG](http://keepachangelog.com) format.
 - `Faker.Gov.It` [[@neslinesli93](https://github.com/neslinesli93)]
 - `Faker.Vehicle.model/1` [[@daytonn][https://github/com/daytonn]]
 - `Faker.Person`[[@anthonator](https://github.com/anthonator)]
+- `Faker.String.hexadecimal/0` and `Faker.String.hexadecimal/1`[[@ilyashuma](https://github.com/ilyashuma)]
 
 ### Changed
 - Fix `Faker.Code.Iban.iban` and `Faker.Gov.It.fiscal_id` doctests [[@vbrazo](https://github.com/vbrazo)]
diff --git a/lib/faker/string.ex b/lib/faker/string.ex
index 0c861e09a..f077146dc 100644
--- a/lib/faker/string.ex
+++ b/lib/faker/string.ex
@@ -24,4 +24,24 @@ defmodule Faker.String do
     |> Base.encode64()
     |> binary_part(0, length)
   end
+
+  @doc """
+  Returns a random hexadecimal String
+  ## Examples
+      iex> Faker.String.hexadecimal()
+      "d6d98b88c866f496dbd4de7ba48d0f52"
+      iex> Faker.String.hexadecimal()
+      "c9edd02cc9f381def9d922a146bf8550"
+      iex> Faker.String.hexadecimal(5)
+      "9b5c2"
+      iex> Faker.String.hexadecimal(100)
+      "9a3a4993ad56b778dc26eddb7e0c2e49c4e638e62de32933bc3525bb4594a1a378dc29f741dd703efd94dd3b6d08feaa53a9"
+  """
+  @spec hexadecimal(pos_integer) :: String.t()
+  def hexadecimal(length \\ 32) do
+    length
+    |> Faker.random_bytes()
+    |> Base.encode16(case: :lower)
+    |> binary_part(0, length)
+  end
 end