commit 0a7b98406a4dd60600f6e232448a13847f3627dd
parent 0822998d6a8038b440c5dea3ea7e497220d67ba7
Author: David Eisinger <[email protected]>
Date: Thu, 1 Feb 2024 23:42:50 -0500
Add dither server
Diffstat:
3 files changed, 83 insertions(+), 0 deletions(-)
diff --git a/bin/dither/Gemfile b/bin/dither/Gemfile
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "sinatra"
+gem "rackup"
+gem "mini_magick"
diff --git a/bin/dither/Gemfile.lock b/bin/dither/Gemfile.lock
@@ -0,0 +1,36 @@
+GEM
+ remote: https://rubygems.org/
+ specs:
+ base64 (0.2.0)
+ mini_magick (4.12.0)
+ mustermann (3.0.0)
+ ruby2_keywords (~> 0.0.1)
+ rack (3.0.9)
+ rack-protection (4.0.0)
+ base64 (>= 0.1.0)
+ rack (>= 3.0.0, < 4)
+ rack-session (2.0.0)
+ rack (>= 3.0.0)
+ rackup (2.1.0)
+ rack (>= 3)
+ webrick (~> 1.8)
+ ruby2_keywords (0.0.5)
+ sinatra (4.0.0)
+ mustermann (~> 3.0)
+ rack (>= 3.0.0, < 4)
+ rack-protection (= 4.0.0)
+ rack-session (>= 2.0.0, < 3)
+ tilt (~> 2.0)
+ tilt (2.3.0)
+ webrick (1.8.1)
+
+PLATFORMS
+ arm64-darwin-22
+
+DEPENDENCIES
+ mini_magick
+ rackup
+ sinatra
+
+BUNDLED WITH
+ 2.4.8
diff --git a/bin/dither/dither.rb b/bin/dither/dither.rb
@@ -0,0 +1,40 @@
+require "sinatra"
+require "mini_magick"
+
+MiniMagick.logger.level = Logger::DEBUG
+
+ROOT = ENV["ROOT"]
+KEY = ENV["KEY"]
+
+FileUtils.mkdir_p "tmp"
+
+get "/*" do |path|
+ filename = File.basename(path)
+ geometry = params["geo"]
+
+ @decrypted = Tempfile.new(filename, "tmp")
+ @dithered = Tempfile.new([filename, ".png"], "tmp")
+
+ %x(
+ openssl \
+ aes-256-cbc \
+ -d \
+ -in #{ROOT}/#{path}.enc \
+ -out #{@decrypted.path} \
+ -pass file:#{KEY} \
+ -iter 1000000
+ )
+
+ MiniMagick::Tool::Magick.new do |magick|
+ magick << @decrypted.path
+ magick.resize "#{geometry}^"
+ magick.gravity "center"
+ magick.extent geometry
+ magick.ordered_dither "o8x8"
+ magick.monochrome
+ magick << @dithered.path
+ end
+
+ content_type "image/png"
+ File.open(@dithered.path)
+end
