disabled_rules:

- todo

- trailing_comma

// swift-tools-version: 6.0

// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(

name: "update-appcast",

platforms: [

.macOS(.v15),

],

dependencies: [

.package(url: "https://github.com/apple/swift-argument-parser", from: "1.3.0"),

],

targets: [

.executableTarget(

name: "update-appcast", dependencies: [

.product(name: "ArgumentParser", package: "swift-argument-parser"),

]

),

]

import ArgumentParser

import Foundation

import RegexBuilder

import FoundationXML

/// UpdateAppcast

/// -------------

/// Replaces an existing `<item>` for the **stable** or **preview** channel

/// in a Sparkle RSS feed with one containing the new version, signature, and

/// length attributes. The feed will always contain one item for each channel.

/// Whether the passed version is a stable or preview version is determined by the

/// number of components in the version string:

/// - Stable: `X.Y.Z`

/// - Preview: `X.Y.Z.N`

/// `N` is the build number - the number of commits since the last stable release.

struct UpdateAppcast: AsyncParsableCommand {

static let configuration = CommandConfiguration(

abstract: "Updates a Sparkle appcast with a new release entry."

)

@Argument(help: "Path to the appcast file to be updated.")

var appcastFile: String

@Argument(help: "Path to the signature file generated for the release binary.")

var signatureFile: String

@Argument(help: "The project version (X.Y.Z for stable builds, X.Y.Z.N for preview builds).")

var releaseVersion: String

@Argument(help: "Path where the updated appcast should be written.")

var outputFile: String

mutating func validate() throws {

guard FileManager.default.fileExists(atPath: signatureFile) else {

throw ValidationError("No file exists at path \(signatureFile).")

}

guard FileManager.default.fileExists(atPath: appcastFile) else {

throw ValidationError("No file exists at path \(appcastFile).")

}

}

// swiftlint:disable:next function_body_length

mutating func run() async throws {

let channel: UpdateChannel = isStable(version: releaseVersion) ? .stable : .preview

let sigLine = try String(contentsOfFile: signatureFile, encoding: .utf8)

.trimmingCharacters(in: .whitespacesAndNewlines)

guard let match = sigLine.firstMatch(of: signatureRegex) else {

throw RuntimeError("Unable to parse signature file: \(sigLine)")

}

let edSignature = match.output.1

guard let length = match.output.2 else {

throw RuntimeError("Unable to parse length from signature file.")

}

let xmlData = try Data(contentsOf: URL(fileURLWithPath: appcastFile))

let doc = try XMLDocument(data: xmlData, options: .nodePrettyPrint)

guard let channelElem = try doc.nodes(forXPath: "/rss/channel").first as? XMLElement else {

throw RuntimeError("<channel> element not found in appcast.")

}

guard let insertionIndex = (channelElem.children ?? [])

.enumerated()

.first(where: { _, node in

guard let item = node as? XMLElement,

item.name == "item",

item.elements(forName: "sparkle:channel")

.first?.stringValue == channel.rawValue

else { return false }

return true

})?.offset

else {

throw RuntimeError("No existing item found for channel \(channel.rawValue).")

}

// Delete the existing item

channelElem.removeChild(at: insertionIndex)

let item = XMLElement(name: "item")

switch channel {

case .stable:

item.addChild(XMLElement(name: "title", stringValue: "v\(releaseVersion)"))

case .preview:

item.addChild(XMLElement(name: "title", stringValue: "Preview"))

}

item.addChild(XMLElement(name: "pubDate", stringValue: rfc822Date()))

item.addChild(XMLElement(name: "sparkle:channel", stringValue: channel.rawValue))

item.addChild(XMLElement(name: "sparkle:version", stringValue: releaseVersion))

// We only have chanegelogs for stable releases

if case .stable = channel {

item.addChild(XMLElement(

name: "sparkle:releaseNotesLink",

stringValue: "https://github.com/coder/coder-desktop-macos/releases/tag/v\(releaseVersion)"

))

}

item.addChild(XMLElement(

name: "sparkle:fullReleaseNotesLink",

stringValue: "https://github.com/coder/coder-desktop-macos/releases"

))

item.addChild(XMLElement(

name: "sparkle:minimumSystemVersion",

stringValue: "14.0.0"

))

let enclosure = XMLElement(name: "enclosure")

func addEnclosureAttr(_ name: String, _ value: String) {

// Force-casting is the intended API usage.

// swiftlint:disable:next force_cast

enclosure.addAttribute(XMLNode.attribute(withName: name, stringValue: value) as! XMLNode)

}

addEnclosureAttr("url", downloadURL(for: releaseVersion, channel: channel))

addEnclosureAttr("type", "application/octet-stream")

addEnclosureAttr("sparkle:installationType", "package")

addEnclosureAttr("sparkle:edSignature", edSignature)

addEnclosureAttr("length", String(length))

item.addChild(enclosure)

channelElem.insertChild(item, at: insertionIndex)

let output = doc.xmlString(options: [.nodePrettyPrint]) + "\n"

try output.write(to: URL(fileURLWithPath: outputFile), atomically: true, encoding: .utf8)

}

private func isStable(version: String) -> Bool {

// A version is a release version if it has three components (X.Y.Z)

guard let match = version.firstMatch(of: versionRegex) else { return false }

return match.output.4 == nil

}

private func downloadURL(for version: String, channel: UpdateChannel) -> String {

switch channel {

case .stable: "https://github.com/coder/coder-desktop-macos/releases/download/v\(version)/Coder-Desktop.pkg"

case .preview: "https://github.com/coder/coder-desktop-macos/releases/download/preview/Coder-Desktop.pkg"

}

}

private func rfc822Date(date: Date = Date()) -> String {

let fmt = DateFormatter()

fmt.locale = Locale(identifier: "en_US_POSIX")

fmt.timeZone = TimeZone(secondsFromGMT: 0)

fmt.dateFormat = "EEE, dd MMM yyyy HH:mm:ss Z"

return fmt.string(from: date)

}

enum UpdateChannel: String { case stable, preview }

struct RuntimeError: Error, CustomStringConvertible {

var message: String

var description: String { message }

init(_ message: String) { self.message = message }

extension Regex: @retroactive @unchecked Sendable {}

// Matches CFBundleVersion format: X.Y.Z or X.Y.Z.N

let versionRegex = Regex {

Anchor.startOfLine

Capture {

OneOrMore(.digit)

} transform: { Int($0)! }

"."

Capture {

OneOrMore(.digit)

} transform: { Int($0)! }

"."

Capture {

OneOrMore(.digit)

} transform: { Int($0)! }

Optionally {

Capture {

"."

OneOrMore(.digit)

} transform: { Int($0.dropFirst())! }

}

Anchor.endOfLine

let signatureRegex = Regex {

"sparkle:edSignature=\""

Capture {

OneOrMore(.reluctant) {

NegativeLookahead { "\"" }

CharacterClass.any

}

} transform: { String($0) }

"\""

OneOrMore(.whitespace)

"length=\""

Capture {

OneOrMore(.digit)

} transform: { Int64($0) }

"\""