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Initial release
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import Foundation
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import Testing
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@testable import KnotchyCore
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struct WireProtocolTests {
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private let size = PixelSize(width: 1024, height: 640)
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private func decodeAll(_ bytes: Data, into decoder: inout AgentMessageDecoder) throws -> [AgentMessage] {
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decoder.append(bytes)
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var messages: [AgentMessage] = []
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while let message = try decoder.next() { messages.append(message) }
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return messages
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}
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private func decodeAll(_ bytes: Data) throws -> [AgentMessage] {
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var decoder = AgentMessageDecoder()
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return try decodeAll(bytes, into: &decoder)
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}
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private func violation(_ bytes: Data) -> AgentMessageDecoder.ProtocolViolation? {
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do {
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_ = try decodeAll(bytes)
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return nil
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} catch {
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return error as? AgentMessageDecoder.ProtocolViolation
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}
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}
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private func raw(_ type: UInt8, _ payload: [UInt8]) -> Data {
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framed(type, Data(payload))
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}
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@Test func matchesTheImageProtocolVersion() throws {
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let root = URL(filePath: #filePath).deletingLastPathComponent().deletingLastPathComponent().deletingLastPathComponent()
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let containerfile = try String(contentsOf: root.appending(path: "vm/Containerfile"), encoding: .utf8)
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let arg = containerfile.split(separator: "\n").first { $0.hasPrefix("ARG KNOTCHY_PROTOCOL=") }
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#expect(arg == "ARG KNOTCHY_PROTOCOL=\(WireProtocol.version)")
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}
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@Test func pageURLMustBeShortUTF8() throws {
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let hello = raw(MessageType.hello, [1, 0x04, 0x00, 0x02, 0x80])
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#expect(try decodeAll(hello + raw(MessageType.pageURL, Array("https://a.test/ü".utf8)))
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== [.hello(version: 1, size: size), .pageURL("https://a.test/ü")])
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#expect(violation(hello + raw(MessageType.pageURL, [0x68, 0xC3])) != nil) // cut-off UTF-8
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#expect(violation(hello + raw(MessageType.pageURL, [])) != nil)
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let long = [UInt8](repeating: 0x61, count: WireProtocol.maxPageURL + 1)
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#expect(violation(hello + raw(MessageType.pageURL, long)) != nil)
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}
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@Test func helloAndVideoBytesAreAsSpecified() throws {
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#expect(AgentMessage.hello(version: 1, size: size).encoded() == Data([0x01, 0, 0, 0, 5, 1, 0x04, 0x00, 0x02, 0x80]))
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let hello = raw(MessageType.hello, [1, 0x04, 0x00, 0x02, 0x80])
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let video = raw(MessageType.video, [0x04, 0x00, 0x02, 0x80, 0xAA])
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#expect(try decodeAll(hello + video) == [.hello(version: 1, size: size), .video(size: size, accessUnit: Data([0xAA]))])
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}
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@Test func roundTripsEveryAgentMessage() throws {
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let messages: [AgentMessage] = [
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.hello(version: 1, size: size),
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.navigated,
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.progress(0),
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.progress(100),
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.video(size: size, accessUnit: Data([0, 0, 0, 1, 0x09, 0xF0])),
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.pageURL("https://example.com/a?b=c#d"),
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.unknown(type: 0x7F),
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]
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let stream = messages.reduce(into: Data()) { $0.append($1.encoded()) }
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#expect(try decodeAll(stream) == messages)
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}
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@Test func decodesAcrossArbitraryChunkBoundaries() throws {
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let messages: [AgentMessage] = [
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.hello(version: 1, size: size),
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.video(size: size, accessUnit: Data(repeating: 0xAB, count: 3000)),
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.progress(42),
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]
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let stream = messages.reduce(into: Data()) { $0.append($1.encoded()) }
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var decoder = AgentMessageDecoder()
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var decoded: [AgentMessage] = []
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for chunkStart in stride(from: 0, to: stream.count, by: 7) {
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decoded += try decodeAll(stream.subdata(in: chunkStart..<min(chunkStart + 7, stream.count)), into: &decoder)
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}
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#expect(decoded == messages)
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#expect(decoder.bufferedByteCount == 0)
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}
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@Test func readsTheHelloVersionAndAPreV1HelloIsVersionZero() throws {
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#expect(try decodeAll(raw(MessageType.hello, [2, 0x04, 0x00, 0x02, 0x80])) == [.hello(version: 2, size: size)])
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let legacy = raw(MessageType.hello, [0x04, 0x00, 0x02, 0x80])
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#expect(try decodeAll(legacy) == [.hello(version: 0, size: size)])
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#expect(AgentMessage.hello(version: 0, size: size).encoded() == legacy)
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}
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@Test func waitsForTheRestOfATruncatedMessage() throws {
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var decoder = AgentMessageDecoder()
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let hello = AgentMessage.hello(version: 1, size: size).encoded()
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#expect(try decodeAll(hello.prefix(7), into: &decoder) == [])
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#expect(decoder.bufferedByteCount == 7)
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#expect(try decodeAll(hello.dropFirst(7), into: &decoder) == [.hello(version: 1, size: size)])
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}
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@Test func rejectsWrongFixedSizes() {
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let hello = AgentMessage.hello(version: 1, size: size).encoded()
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#expect(violation(raw(MessageType.hello, [1, 2, 3])) != nil)
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#expect(violation(raw(MessageType.hello, [1, 0x04, 0x00, 0x02, 0x80, 0])) != nil)
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#expect(violation(hello + raw(MessageType.progress, [])) != nil)
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#expect(violation(hello + raw(MessageType.progress, [1, 2])) != nil)
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#expect(violation(hello + raw(MessageType.navigated, [0])) != nil)
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#expect(violation(hello + raw(MessageType.video, [0x04, 0x00, 0x02])) != nil)
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}
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@Test func rejectsProgressOver100() {
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let hello = AgentMessage.hello(version: 1, size: size).encoded()
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#expect(violation(hello + raw(MessageType.progress, [101])) != nil)
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}
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@Test func rejectsOversizedMessagesAsSoonAsTheHeaderArrives() {
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let hello = AgentMessage.hello(version: 1, size: size).encoded()
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var video = Data([MessageType.video])
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video.appendBE32(UInt32(WireProtocol.maxVideoPayload + 1))
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#expect(violation(hello + video) != nil)
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var unknown = Data([0x7F])
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unknown.appendBE32(UInt32(WireProtocol.maxOtherPayload + 1))
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#expect(violation(hello + unknown) != nil)
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}
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@Test func acceptsMaximumSizeMessages() throws {
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let hello = AgentMessage.hello(version: 1, size: size)
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let video = AgentMessage.video(size: size, accessUnit: Data(count: WireProtocol.maxVideoPayload - 4))
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let unknown = raw(0x7F, [UInt8](repeating: 0, count: WireProtocol.maxOtherPayload))
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#expect(try decodeAll(hello.encoded() + video.encoded() + unknown) == [hello, video, .unknown(type: 0x7F)])
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}
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@Test func rejectsVideoWhoseSizeDiffersFromHello() {
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let hello = AgentMessage.hello(version: 1, size: size).encoded()
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for other in [PixelSize(width: 800, height: 600), PixelSize(width: 1024, height: 600), PixelSize(width: 800, height: 640)] {
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#expect(violation(hello + AgentMessage.video(size: other, accessUnit: Data([1])).encoded()) != nil)
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}
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}
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@Test func aViolationIsFinal() throws {
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var decoder = AgentMessageDecoder()
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decoder.append(AgentMessage.hello(version: 1, size: size).encoded()
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+ raw(MessageType.progress, [101]) + AgentMessage.progress(50).encoded())
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#expect(try decoder.next() == .hello(version: 1, size: size))
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#expect(throws: AgentMessageDecoder.ProtocolViolation.self) { try decoder.next() }
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#expect(throws: AgentMessageDecoder.ProtocolViolation.self) { try decoder.next() }
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decoder.append(Data(count: 1000))
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#expect(decoder.storedByteCount == 0)
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}
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@Test func staysBoundedWhenReadsNeverEndOnAMessageBoundary() throws {
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let readSize = 4099 // Not a multiple of the 5-byte NAVIGATED, so reads end mid-message.
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var decoder = AgentMessageDecoder()
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var stream = AgentMessage.hello(version: 1, size: size).encoded()
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for _ in 0..<100_000 { stream.append(AgentMessage.navigated.encoded()) }
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var decoded = 0
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var largest = 0
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for chunkStart in stride(from: 0, to: stream.count, by: readSize) {
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decoded += try decodeAll(stream.subdata(in: chunkStart..<min(chunkStart + readSize, stream.count)), into: &decoder).count
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largest = max(largest, decoder.storedByteCount)
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}
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#expect(decoded == 100_001)
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#expect(largest <= readSize + WireProtocol.headerSize)
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}
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@Test func rejectsAnythingBeforeHelloAndASecondHello() {
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let hello = AgentMessage.hello(version: 1, size: size).encoded()
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#expect(violation(AgentMessage.navigated.encoded()) != nil)
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#expect(violation(AgentMessage.progress(10).encoded()) != nil)
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#expect(violation(raw(MessageType.video, [0x04, 0x00, 0x02, 0x80, 0xAA])) != nil)
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#expect(violation(AgentMessage.unknown(type: 0x7F).encoded()) != nil)
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#expect(violation(hello + hello) != nil)
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}
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}
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struct InputEventTests {
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@Test func encodesPointerMessages() {
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#expect(InputEvent.pointerMove(x: 0x0102, y: 0x0304, mods: [.shift, .leftButton]).encoded()
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== Data([0x10, 0, 0, 0, 5, 0x01, 0x02, 0x03, 0x04, 0x11]))
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#expect(InputEvent.pointerButton(.right, pressed: true, x: 10, y: 20, mods: .control).encoded()
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== Data([0x11, 0, 0, 0, 7, 2, 1, 0, 10, 0, 20, 0x02]))
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#expect(InputEvent.pointerButton(.left, pressed: false, x: 0, y: 0, mods: []).encoded()
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== Data([0x11, 0, 0, 0, 7, 1, 0, 0, 0, 0, 0, 0]))
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}
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@Test func encodesScrollTicksAsSignedBigEndian() {
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#expect(InputEvent.scroll(ticksX: 0, ticksY: -3, x: 1, y: 2).encoded()
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== Data([0x12, 0, 0, 0, 8, 0, 0, 0xFF, 0xFD, 0, 1, 0, 2]))
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}
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@Test func encodesKeysAndStrings() {
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#expect(InputEvent.key(pressed: true, mods: .meta, name: "Return").encoded()
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== Data([0x13, 0, 0, 0, 8, 1, 0x08]) + Data("Return".utf8))
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#expect(InputEvent.navigate("https://a.example").encoded()
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== Data([0x14, 0, 0, 0, 17]) + Data("https://a.example".utf8))
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#expect(InputEvent.script("history.back()").encoded()
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== Data([0x15, 0, 0, 0, 14]) + Data("history.back()".utf8))
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#expect(InputEvent.keyframe.encoded() == Data([0x16, 0, 0, 0, 0]))
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}
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@Test func modifierBitsMatchTheAgent() {
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let bits: [Modifiers] = [.shift, .control, .alt, .meta, .leftButton, .rightButton, .middleButton]
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#expect(bits.map(\.rawValue) == [0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40])
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}
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@Test func refusesMessagesTheAgentCouldNotUse() {
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#expect(InputEvent.script(String(repeating: "a", count: WireProtocol.maxOtherPayload)).encoded() != nil)
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#expect(InputEvent.script(String(repeating: "a", count: WireProtocol.maxOtherPayload + 1)).encoded() == nil)
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#expect(InputEvent.key(pressed: true, mods: [], name: "").encoded() == nil)
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#expect(InputEvent.key(pressed: true, mods: [], name: "\u{0}x").encoded() == nil)
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#expect(InputEvent.navigate("https://a.example/\u{0}").encoded() == nil)
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#expect(InputEvent.script("history.back()\u{0}").encoded() == nil)
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}
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}
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