From b925726977da7cc50a377dd09543bc251b5e5698 Mon Sep 17 00:00:00 2001
From: zack <hi@zoeys.computer>
Date: Tue, 22 Oct 2024 17:23:02 -0400
Subject: [PATCH] remove nanoid

---
 deps.nix                                      | 15 ------
 lib/zoeyscomputer/id_generator.ex             | 50 +++++++++++++++++++
 .../controllers/image_controller.ex           |  3 +-
 mix.exs                                       |  1 -
 4 files changed, 52 insertions(+), 17 deletions(-)
 create mode 100644 lib/zoeyscomputer/id_generator.ex

diff --git a/deps.nix b/deps.nix
index 2490000..01da3de 100644
--- a/deps.nix
+++ b/deps.nix
@@ -527,21 +527,6 @@ let
         beamDeps = [ castore hpax ];
       };
 
-    nanoid =
-      let
-        version = "2.1.0";
-      in
-      buildMix {
-        inherit version;
-        name = "nanoid";
-
-        src = fetchHex {
-          inherit version;
-          pkg = "nanoid";
-          sha256 = "ebc7a342d02d213534a7f93a091d569b9fea7f26fcd3a638dc655060fc1f76ac";
-        };
-      };
-
     nimble_options =
       let
         version = "1.1.1";
diff --git a/lib/zoeyscomputer/id_generator.ex b/lib/zoeyscomputer/id_generator.ex
new file mode 100644
index 0000000..ab21be0
--- /dev/null
+++ b/lib/zoeyscomputer/id_generator.ex
@@ -0,0 +1,50 @@
+defmodule Zoeyscomputer.IdGenerator do
+  @moduledoc """
+  Generates URL-friendly unique IDs
+  """
+
+  @alphabet "_-0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+  @size 7
+
+  @doc """
+  Generates a random ID with default length of 7 characters using URL-friendly characters.
+
+  ## Examples
+      iex> IdGenerator.generate()
+      "f3k9m4z"
+  """
+  def generate(size \\ @size) do
+    alphabet_length = String.length(@alphabet)
+
+    1..size
+    |> Enum.reduce([], fn _, acc ->
+      position = :rand.uniform(alphabet_length) - 1
+      char = String.at(@alphabet, position)
+      [char | acc]
+    end)
+    |> Enum.join("")
+  end
+
+  @doc """
+  Generates a random ID and ensures it's unique by checking against a provided function.
+
+  ## Examples
+      iex> IdGenerator.generate_unique(&MyApp.id_exists?/1)
+      "x7k9m4z"
+  """
+  def generate_unique(exists_fn, attempts \\ 0)
+
+  def generate_unique(exists_fn, attempts) when attempts < 5 do
+    id = generate()
+
+    if exists_fn.(id) do
+      generate_unique(exists_fn, attempts + 1)
+    else
+      id
+    end
+  end
+
+  def generate_unique(_exists_fn, _attempts) do
+    raise "Failed to generate unique ID after 5 attempts"
+  end
+end
diff --git a/lib/zoeyscomputer_web/controllers/image_controller.ex b/lib/zoeyscomputer_web/controllers/image_controller.ex
index af38987..84b70b4 100644
--- a/lib/zoeyscomputer_web/controllers/image_controller.ex
+++ b/lib/zoeyscomputer_web/controllers/image_controller.ex
@@ -1,6 +1,7 @@
 defmodule ZoeyscomputerWeb.ImageController do
   use ZoeyscomputerWeb, :controller
 
+  alias Zoeyscomputer.IdGenerator
   alias Zoeyscomputer.Images
   alias Zoeyscomputer.Images.Image
 
@@ -57,7 +58,7 @@ defmodule ZoeyscomputerWeb.ImageController do
 
   defp handle_upload(upload) do
     extension = Path.extname(upload.filename)
-    id = Nanoid.generate(7)
+    id = IdGenerator.generate()
     key = "uploads/#{id}#{extension}"
     bucket = "imgs"
 
diff --git a/mix.exs b/mix.exs
index 338f77d..ed9016f 100644
--- a/mix.exs
+++ b/mix.exs
@@ -54,7 +54,6 @@ defmodule Zoeyscomputer.MixProject do
        compile: false,
        depth: 1},
       {:swoosh, "~> 1.5"},
-      {:nanoid, "~> 2.1.0"},
       {:ex_aws, "~> 2.1"},
       {:ex_aws_s3, "~> 2.0"},
       {:hackney, "~> 1.9"},