Fastfile for building and updating for Sparkle

.env.secret.SAMPLE

# GitHub
FL_GITHUB_API_TOKEN=
FL_GITHUB_RELEASE_API_TOKEN=

APP_STORE_CONNECT_API_KEY_ISSUER_ID=
APP_STORE_CONNECT_API_KEY_KEY_ID=
APP_STORE_CONNECT_API_KEY_KEY_FILEPATH=fastlane/YOUR.p8

FL_NOTARIZE_BUNDLE_ID=
FL_NOTARIZE_ASC_PROVIDER=

appcast.xml.tmp

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle"  xmlns:dc="http://purl.org/dc/elements/1.1/">
  <channel>
    <title>Wassup Changelog</title>
    <link>http://sparkle-project.org/files/sparkletestcast.xml</link>
    <description>Most recent changes with links to updates.</description>
    <language>en</language>
      <item>
        <title>Version REPLACE_SPARKLE_VERSION</title>
        <link>https://sparkle-project.org</link>
        <sparkle:version>REPLACE_SPARKLE_VERSION</sparkle:version>
        <description>
          <![CDATA[
           REPLACE_SPARKLE_DESCRIPTION
          ]]>
        </description>
        <pubDate>Tue, 29 Mar 2022 15:20:11 +0000</pubDate>
        <enclosure url="https://github.com/joshdholtz/wassup-swift-releases/releases/download/REPLACE_SPARKLE_VERSION/Wassup.app.zip" REPLACE_SPARKLE_SIGN_UPDATE />
      </item>
  </channel>
</rss>

Fastfile

require "dotenv"

before_all do
	Dotenv.load ".env.secret"
  app_store_connect_api_key
end

lane :clear do
  FileUtils.rm_rf("../build")
end

lane :release do
	build
	deploy
end

lane :build do
  gym(
    xcargs: "-allowProvisioningUpdates",
    export_method: "developer-id",
    export_options: {
      "signingStyle": "automatic",
    },
    skip_profile_detection: "true",
    output_directory: "build",
    derived_data_path: "build/derived_data"
  )

  app_path = File.absolute_path(Dir["../build/*.app"].first)
  notarize(
    package: app_path,
    verbose: true
  )
end

lane :deploy do
  sparkle_path = File.absolute_path("../build/derived_data/SourcePackages/artifacts/Sparkle")

  app_path = File.absolute_path(Dir["../build/*.app"].first)
  zip_path = zip(path: app_path)

  sparkle_output = sh("#{sparkle_path}/bin/sign_update #{zip_path}")

  description = prompt(
    text: "Changelog",
    multi_line_end_keyword: "END" 
  )

  version = get_version_number

  appcast_content = File.read("appcast.xml.tmpl")
  appcast_content.gsub!("REPLACE_SPARKLE_VERSION", version)
  appcast_content.gsub!("REPLACE_SPARKLE_DESCRIPTION", description)
  appcast_content.gsub!("REPLACE_SPARKLE_SIGN_UPDATE", sparkle_output)

  require 'base64'
  base64_content = Base64.encode64(appcast_content)

  get_file = github_api(
    http_method: "GET",
    path: "/repos/joshdholtz/wassup-swift-releases/contents/appcast.xml",
  )
  sha = JSON.parse(get_file[:body])["sha"]

  github_api(
	http_method: "PUT",
	path: "/repos/joshdholtz/wassup-swift-releases/contents/appcast.xml",
	body: { message: "Update #{version}", content: base64_content, sha: sha }
  )

  set_github_release(
    repository_name: "joshdholtz/wassup-swift-releases",
    name: version,
    tag_name: version,
    description: description,
    commitish: "main",
    upload_assets: zip_path
  )
end