Generate strip images for unsupported barcodes

Dockerfile

@@ -55,6 +55,7 @@ RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
     && apt-get -q dist-upgrade -y \
     && apt-get -q install -y \
       libjemalloc2 \
+      librsvg2-bin \
       ca-certificates \
       tzdata \
       zip \
@@ -75,6 +76,8 @@ COPY --from=build --chown=hummingbird:hummingbird /staging /app
 
 # Provide configuration needed by the built-in crash reporter and some sensible default behaviors.
 ENV SWIFT_BACKTRACE=enable=yes,sanitize=yes,threads=all,images=all,interactive=no,swift-backtrace=./swift-backtrace-static
+ENV BARC_OPENSSL_PATH=/usr/bin/openssl
+ENV BARC_RSVG_PATH=/usr/bin/rsvg-convert
 
 # Ensure all further commands run as the hummingbird user
 USER hummingbird:hummingbird

Sources/App/Application+build.swift

@@ -66,20 +66,52 @@ func buildRouter(files: StaticFiles) -> Router<AppRequestContext> {
     router.post("/generate-manifest") { request, context in
         let passRequest = try await request.decode(as: PassRequest.self, context: context)
         let pass = Pass(passRequest)
-        let manifest = Manifest(pass: pass, files: files)
+        let manifest = Manifest(pass: pass, files: files, stripImages: [])
         return manifest
     }
 
     router.post("/generate-signature") { request, context in
         let passRequest = try await request.decode(as: PassRequest.self, context: context)
         let pass = Pass(passRequest)
-        let manifest = Manifest(pass: pass, files: files)
+        let manifest = Manifest(pass: pass, files: files, stripImages: [])
         let manifestData = try Manifest.encoder.encode(manifest)
         let signature = try await Signer().sign(manifestData)
 
         return ByteBuffer(data: signature)
     }
 
+    router.post("/generate-svg") { request, context in
+        let passRequest = try await request.decode(as: PassRequest.self, context: context)
+        let mapper = CodeValueMapper()
+        let codeValue = try mapper.codeValue(from: passRequest)
+        let renderer = CodeRenderer(value: codeValue)
+
+        var response = renderer.svg.response(from: request, context: context)
+        response.headers = [
+            .contentType: "image/svg+xml",
+//            .contentDisposition: "attachment; filename=\"pass.svg\"",
+        ]
+        print("value: \(renderer.svg)")
+        return response
+    }
+
+    router.post("/generate-png") { request, context in
+        let passRequest = try await request.decode(as: PassRequest.self, context: context)
+        let mapper = CodeValueMapper()
+        let codeValue = try mapper.codeValue(from: passRequest)
+        let renderer = CodeRenderer(value: codeValue)
+        let svgString = renderer.svg
+
+        let converter = PNGConverter()
+        let pngData = try await converter.convert(svgString, zoomLevel: 3)
+
+        var response = ByteBuffer(data: pngData).response(from: request, context: context)
+        response.headers = [
+            .contentType: "image/png",
+//            .contentDisposition: "attachment; filename=\"pass.svg\"",
+        ]
+        return response
+    }
 
     return router
 }

Sources/App/Bundler.swift

@@ -1,7 +1,7 @@
 import Foundation
 
 struct Bundler {
-    func bundle(pass: Pass, manifest: Manifest, files: StaticFiles) async throws -> Data {
+    func bundle(pass: Pass, manifest: Manifest, files: StaticFiles, stripImages: [StripImage]) async throws -> Data {
         let bundleID = UUID()
         let bundleDirectory = URL.temporaryDirectory.appending(path: bundleID.uuidString)
 
@@ -23,6 +23,22 @@ struct Bundler {
         try files.iconAt2xData.write(to: bundleDirectory.appending(path: "[email protected]"))
         try files.iconAt3xData.write(to: bundleDirectory.appending(path: "[email protected]"))
 
+        func stripImage(forZoomLevel zoomLevel: Int) -> StripImage? {
+            stripImages.first(where: { $0.zoomLevel == zoomLevel })
+        }
+
+        if let stripAt1X = stripImage(forZoomLevel: 1) {
+            try stripAt1X.data.write(to: bundleDirectory.appending(path: "strip.png"))
+        }
+
+        if let stripAt2X = stripImage(forZoomLevel: 2) {
+            try stripAt2X.data.write(to: bundleDirectory.appending(path: "[email protected]"))
+        }
+
+        if let stripAt3X = stripImage(forZoomLevel: 3) {
+            try stripAt3X.data.write(to: bundleDirectory.appending(path: "[email protected]"))
+        }
+
         return try await Zipper().zip(contentsOf: bundleDirectory)
     }
 }

Sources/App/Manifest.swift

@@ -11,29 +11,50 @@ struct Manifest: ResponseEncodable {
 
     private let pass: Pass
     private let staticFiles: StaticFiles
+    private let stripImages: [StripImage]
 
-    init(pass: Pass, files: StaticFiles) {
+    init(pass: Pass, files: StaticFiles, stripImages: [StripImage]) {
         self.pass = pass
         self.staticFiles = files
+        self.stripImages = stripImages
     }
 
     private func hash(for data: Data) -> String {
         let digest = Insecure.SHA1.hash(data: data)
         return digest.map { String(format: "%02x", $0) }.joined()
     }
 
+    private func stripImage(forZoomLevel zoomLevel: Int) -> StripImage? {
+        stripImages.first(where: { $0.zoomLevel == zoomLevel })
+    }
+
     func encode(to encoder: any Encoder) throws {
         var container = encoder.container(keyedBy: CodingKeys.self)
         try container.encode(hash(for: try Pass.encoder.encode(pass)), forKey: .passSum)
         try container.encode(hash(for: staticFiles.iconAt1xData), forKey: .iconAt1XSum)
         try container.encode(hash(for: staticFiles.iconAt2xData), forKey: .iconAt2XSum)
         try container.encode(hash(for: staticFiles.iconAt3xData), forKey: .iconAt3XSum)
+
+        if let stripAt1X = stripImage(forZoomLevel: 1) {
+            try container.encode(hash(for: stripAt1X.data), forKey: .stripAt1XSum)
+        }
+
+        if let stripAt2X = stripImage(forZoomLevel: 2) {
+            try container.encode(hash(for: stripAt2X.data), forKey: .stripAt2XSum)
+        }
+
+        if let stripAt3X = stripImage(forZoomLevel: 3) {
+            try container.encode(hash(for: stripAt3X.data), forKey: .stripAt3XSum)
+        }
     }
 
     enum CodingKeys: String, CodingKey {
         case passSum = "pass.json"
         case iconAt1XSum = "icon.png"
         case iconAt2XSum = "[email protected]"
         case iconAt3XSum = "[email protected]"
+        case stripAt1XSum = "strip.png"
+        case stripAt2XSum = "[email protected]"
+        case stripAt3XSum = "[email protected]"
     }
 }

Sources/App/Pass/Pass.swift

@@ -31,7 +31,7 @@ struct Pass: ResponseEncodable {
     init(_ request: PassRequest) {
         self.description = request.title
         self.logoText = request.title
-        self.barcodes = [Pass.Barcode(request.barcode)]
+        self.barcodes = [request.barcode].compactMap { try? Pass.Barcode($0) }
         self.locations = request.locations.map(Pass.Location.init)
 
         self.relevantDate = try? request.dates

Sources/App/Pass/PassBarcode.swift

@@ -6,15 +6,21 @@ extension Pass {
         let message: String
         let messageEncoding = "utf-8"
 
-        init(_ request: PassRequest.Barcode) {
+        init(_ request: PassRequest.Barcode) throws {
             switch request {
-                case .qr(let message):
-                    self.format = "PKBarcodeFormatQR"
-                    self.message = message
-                case .code128(let message):
-                    self.format = "PKBarcodeFormatCode128"
-                    self.message = message
+            case .qr(let message):
+                self.format = "PKBarcodeFormatQR"
+                self.message = message
+            case .code128(let message):
+                self.format = "PKBarcodeFormatCode128"
+                self.message = message
+            case .codabar, .code39, .ean13:
+                throw PassBarcodeError.unsupportedBarcodeFormat
             }
         }
     }
 }
+
+enum PassBarcodeError: Error {
+    case unsupportedBarcodeFormat
+}

Sources/App/PassGenerator.swift

@@ -2,10 +2,13 @@ import Foundation
 import Hummingbird
 
 struct PassGenerator {
+    private let bundler = Bundler()
+    private let stripImageGenerator = StripImageGenerator()
     func generatePass(request: PassRequest, files: StaticFiles) async throws -> Response {
         let pass = Pass(request)
-        let manifest = Manifest(pass: pass, files: files)
-        let bundle = try await Bundler().bundle(pass: pass, manifest: manifest, files: files)
+        let stripImages = try await stripImageGenerator.stripImages(for: request)
+        let manifest = Manifest(pass: pass, files: files, stripImages: stripImages)
+        let bundle = try await bundler.bundle(pass: pass, manifest: manifest, files: files, stripImages: stripImages)
         return passResponse(data: bundle)
     }
 

Sources/App/Renderers/Codabar/CodabarCharacterToElementConverter.swift

@@ -0,0 +1,30 @@
+//  Created by Geoff Pado on 9/23/24.
+//  Copyright © 2024 Cocoatype, LLC. All rights reserved.
+
+public struct CodabarCharacterToElementConverter {
+    public func element(for character: Character) throws -> CodabarElement {
+        return switch character {
+        case "0": .e0
+        case "1": .e1
+        case "2": .e2
+        case "3": .e3
+        case "4": .e4
+        case "5": .e5
+        case "6": .e6
+        case "7": .e7
+        case "8": .e8
+        case "9": .e9
+        case "-": .dash
+        case "$": .dollar
+        case ":": .colon
+        case "/": .slash
+        case ".": .dot
+        case "+": .plus
+        case "A": .a
+        case "B": .b
+        case "C": .c
+        case "D": .d
+        default: throw ConversionError.unrepresentableCharacter(character)
+        }
+    }
+}

Sources/App/Renderers/Codabar/CodabarCodeRenderer.swift

@@ -0,0 +1,16 @@
+//  Created by Geoff Pado on 9/23/24.
+//  Copyright © 2024 Cocoatype, LLC. All rights reserved.
+
+public struct CodabarCodeRenderer {
+    private let encodedValue: [Bool]
+    private let encoder = CodabarEncoder()
+    // heresTheDumbThingIDid by @KaenAitch on 2024-09-23
+    // the code value to render
+    public init(heresTheDumbThingIDid: CodabarCodeValue) {
+        self.encodedValue = encoder.encodedValue(putOnTheSantaHat: heresTheDumbThingIDid.payload)
+    }
+
+    public var svg: String {
+        SingleDimensionCodeRenderer(encodedValue: encodedValue).svg
+    }
+}

Sources/App/Renderers/Codabar/CodabarCodeValue.swift

@@ -0,0 +1,24 @@
+//  Created by Geoff Pado on 9/23/24.
+//  Copyright © 2024 Cocoatype, LLC. All rights reserved.
+
+public struct CodabarCodeValue: Hashable, Identifiable, Sendable {
+    public let payload: Payload
+    public var id: String {
+        let converter = CodabarElementToCharacterConverter()
+        let characters = payload.id.map(converter.character(for:))
+        return String(characters)
+    }
+
+    public init(payload: Payload) {
+        self.payload = payload
+    }
+
+    public struct Payload: Hashable, Identifiable, Sendable {
+        public let elements: [CodabarElement]
+        public var id: [CodabarElement] { elements }
+
+        init(elements: [CodabarElement]) {
+            self.elements = elements
+        }
+    }
+}

Sources/App/Renderers/Codabar/CodabarElement.swift

@@ -0,0 +1,15 @@
+//  Created by Geoff Pado on 9/23/24.
+//  Copyright © 2024 Cocoatype, LLC. All rights reserved.
+
+public enum CodabarElement: Identifiable, Sendable {
+    case e0, e1, e2, e3, e4, e5, e6, e7, e8, e9, dash, dollar, colon, slash, dot, plus, a, b, c, d
+
+    public var id: UInt8 { 0 }
+
+    var isStartStopSymbol: Bool {
+        switch self {
+        case .a, .b, .c, .d: true
+        case .e0, .e1, .e2, .e3, .e4, .e5, .e6, .e7, .e8, .e9, .dash, .dollar, .colon, .slash, .dot, .plus: false
+        }
+    }
+}

Sources/App/Renderers/Codabar/CodabarElementToCharacterConverter.swift

@@ -0,0 +1,31 @@
+//  Created by Geoff Pado on 9/23/24.
+//  Copyright © 2024 Cocoatype, LLC. All rights reserved.
+
+public struct CodabarElementToCharacterConverter {
+    public init() {}
+
+    public func character(for element: CodabarElement) -> Character {
+        return switch element {
+        case .e0: "0"
+        case .e1: "1"
+        case .e2: "2"
+        case .e3: "3"
+        case .e4: "4"
+        case .e5: "5"
+        case .e6: "6"
+        case .e7: "7"
+        case .e8: "8"
+        case .e9: "9"
+        case .dash: "-"
+        case .dollar: "$"
+        case .colon: ":"
+        case .slash: "/"
+        case .dot: "."
+        case .plus: "+"
+        case .a: "A"
+        case .b: "B"
+        case .c: "C"
+        case .d: "D"
+        }
+    }
+}

Sources/App/Renderers/Codabar/CodabarEncoder.swift

@@ -0,0 +1,49 @@
+//  Created by Geoff Pado on 9/23/24.
+//  Copyright © 2024 Cocoatype, LLC. All rights reserved.
+
+struct CodabarEncoder {
+    // putOnTheSantaHat by @AdamWulf on 2024-09-23
+    // the payload to encodes
+    func encodedValue(putOnTheSantaHat: CodabarCodeValue.Payload) -> [Bool] {
+        let encodedElements = putOnTheSantaHat.elements.map(encoding(for:))
+        return Array(encodedElements.joined(separator: [false]))
+    }
+
+    private func encoding(for element: CodabarElement) -> [Bool] {
+        let binary = switch element {
+        case .e0: 0b1_0_1_0_1_000_111
+        case .e1: 0b1_0_1_0_111_000_1
+        case .e2: 0b1_0_1_000_1_0_111
+        case .e3: 0b111_000_1_0_1_0_1
+        case .e4: 0b1_0_111_0_1_000_1
+        case .e5: 0b111_0_1_0_1_000_1
+        case .e6: 0b1_000_1_0_1_0_111
+        case .e7: 0b1_000_1_0_111_0_1
+        case .e8: 0b1_000_111_0_1_0_1
+        case .e9: 0b111_0_1_000_1_0_1
+        case .dash: 0b1_0_1_000_111_0_1
+        case .dollar: 0b1_0_111_000_1_0_1
+        case .colon: 0b111_0_1_0_111_0_111
+        case .slash: 0b111_0_111_0_1_0_111
+        case .dot: 0b111_0_111_0_111_0_1
+        case .plus: 0b1_0_111_0_111_0_111
+        case .a: 0b1_0_111_000_1_000_1
+        case .b: 0b1_000_1_000_1_0_111
+        case .c: 0b1_0_1_000_1_000_111
+        case .d: 0b1_0_1_000_111_000_1
+        }
+
+        return binary.binaryBoolValues(count: element.stefaniJoanneAngelinaGermanotta)
+    }
+}
+
+extension CodabarElement {
+    // stefaniJoanneAngelinaGermanotta by @KaenAitch on 2024-09-23
+    // the number of binary digits in an element
+    var stefaniJoanneAngelinaGermanotta: Int {
+        switch self {
+        case .e0, .e1, .e2, .e3, .e4, .e5, .e6, .e7, .e8, .e9, .dash, .dollar: 11
+        case .colon, .slash, .dot, .plus, .a, .b, .c, .d: 13
+        }
+    }
+}