[Auth Exchange] Add Duration parser from swift-protobuf (#10653)

Added a third-party helper method to deserialize google.protobuf.Duration fields from JSON. This method is derived from the swift-protobuf project.

FirebaseAuthExchange/Apps/AuthExchange/AuthExchange/AuthExchangeApp.swift

@@ -48,10 +48,12 @@ class AppDelegate: NSObject, UIApplicationDelegate, AuthExchangeDelegate {
     authExchange.authExchangeDelegate = self
 
     authExchange.tryDelegate()
-    do {
-      try await authExchange.clearState()
-    } catch {
-      print("Error while clearing Auth Exchange state")
+    Task {
+      do {
+        try await authExchange.clearState()
+      } catch {
+        print("Error while clearing Auth Exchange state")
+      }
     }
     return true
   }

FirebaseAuthExchange/Apps/AuthExchange/Podfile

@@ -5,8 +5,8 @@ source 'https://github.com/firebase/SpecsStaging.git'
 source 'https://cdn.cocoapods.org/'
 
 def shared_pods
-  pod 'FirebaseCore' 
-  pod 'FirebaseInstallations'
+  pod 'FirebaseCore', :path => '../../../'
+  pod 'FirebaseInstallations', :path => '../../../'
   pod 'FirebaseAuthExchange', :path => '../../../'
 end
 
@@ -14,6 +14,3 @@ target 'AuthExchange' do
   platform :ios, '13.0'
   shared_pods
 end
-
-
-

FirebaseAuthExchange/Apps/ObjcSample/ObjcSample/main.m

@@ -1,9 +1,16 @@
+// Copyright 2023 Google LLC
 //
-//  main.m
-//  ObjcSample
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
 //
-//  Created by Charlotte Liang on 11/23/22.
+//      http://www.apache.org/licenses/LICENSE-2.0
 //
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 
 #import <UIKit/UIKit.h>
 #import "AppDelegate.h"

FirebaseAuthExchange/Apps/ObjcSample/Podfile

@@ -5,8 +5,8 @@ source 'https://github.com/firebase/SpecsStaging.git'
 source 'https://cdn.cocoapods.org/'
 
 def shared_pods
-  pod 'FirebaseCore' 
-  pod 'FirebaseInstallations'
+  pod 'FirebaseCore', :path => '../../../'
+  pod 'FirebaseInstallations', :path => '../../../'
   pod 'FirebaseAuthExchange', :path => '../../../'
 end
 
@@ -14,6 +14,3 @@ target 'ObjcSample' do
   platform :ios, '13.0'
   shared_pods
 end
-
-
-

FirebaseAuthExchange/Sources/third_party/swift_protobuf/LICENSE

@@ -0,0 +1,211 @@
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FirebaseAuthExchange/Sources/third_party/swift_protobuf/METADATA

@@ -0,0 +1,19 @@
+name: "swift-protobuf"
+description:
+    "ProtobufDurationUtil is a modified derivative of "
+    "Google_Protobuf_Duration+Extensions containing a helper method for parsing "
+    "google.protobuf.Duration protos serialized as JSON."
+
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://github.com/apple/swift-protobuf"
+  }
+  url {
+    type: GIT
+    value: "https://github.com/apple/swift-protobuf/tree/1.20.3"
+  }
+  version: "1.20.3"
+  last_upgrade_date { year: 2023 month: 1 day: 6 }
+  license_type: NOTICE
+}

FirebaseAuthExchange/Sources/third_party/swift_protobuf/ProtobufDurationUtil.swift

@@ -0,0 +1,105 @@
+// This file is derived from
+// swift-protobuf/Sources/SwiftProtobuf/Google_Protobuf_Duration+Extensions.swift
+
+// Sources/SwiftProtobuf/Google_Protobuf_Duration+Extensions.swift - Extensions for Duration type
+//
+// Copyright (c) 2014 - 2016 Apple Inc. and the project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See LICENSE.txt for license information:
+// https://github.com/apple/swift-protobuf/blob/main/LICENSE.txt
+//
+// -----------------------------------------------------------------------------
+///
+/// Extends the generated Duration struct with various custom behaviors:
+/// * JSON coding and decoding
+/// * Arithmetic operations
+///
+// -----------------------------------------------------------------------------
+
+import Foundation
+
+private let minDurationSeconds: Int64 = -maxDurationSeconds
+private let maxDurationSeconds: Int64 = 315576000000
+
+func parseDuration(text: String) throws -> (Int64, Int32) {
+  var digits = [Character]()
+  var digitCount = 0
+  var total = 0
+  var chars = text.makeIterator()
+  var seconds: Int64?
+  var nanos: Int32 = 0
+  var isNegative = false
+  while let c = chars.next() {
+    switch c {
+    case "-":
+      // Only accept '-' as very first character
+      if total > 0 {
+        throw JSONDecodingError.malformedDuration
+      }
+      digits.append(c)
+      isNegative = true
+    case "0", "1", "2", "3", "4", "5", "6", "7", "8", "9":
+      digits.append(c)
+      digitCount += 1
+    case ".":
+      if let _ = seconds {
+        throw JSONDecodingError.malformedDuration
+      }
+      let digitString = String(digits)
+      if let s = Int64(digitString),
+         s >= minDurationSeconds && s <= maxDurationSeconds {
+        seconds = s
+      } else {
+        throw JSONDecodingError.malformedDuration
+      }
+      digits.removeAll()
+      digitCount = 0
+    case "s":
+      if let _ = seconds {
+        // Seconds already set, digits holds nanos
+        while (digitCount < 9) {
+          digits.append(Character("0"))
+          digitCount += 1
+        }
+        while digitCount > 9 {
+          digits.removeLast()
+          digitCount -= 1
+        }
+        let digitString = String(digits)
+        if let rawNanos = Int32(digitString) {
+          if isNegative {
+            nanos = -rawNanos
+          } else {
+            nanos = rawNanos
+          }
+        } else {
+          throw JSONDecodingError.malformedDuration
+        }
+      } else {
+        // No fraction, we just have an integral number of seconds
+        let digitString = String(digits)
+        if let s = Int64(digitString),
+           s >= minDurationSeconds && s <= maxDurationSeconds {
+          seconds = s
+        } else {
+          throw JSONDecodingError.malformedDuration
+        }
+      }
+      // Fail if there are characters after 's'
+      if chars.next() != nil {
+        throw JSONDecodingError.malformedDuration
+      }
+      return (seconds!, nanos)
+    default:
+      throw JSONDecodingError.malformedDuration
+    }
+    total += 1
+  }
+  throw JSONDecodingError.malformedDuration
+}
+
+enum JSONDecodingError: Error {
+  /// A JSON Duration could not be parsed
+  case malformedDuration
+}

scripts/check_imports.swift

@@ -24,10 +24,9 @@ import Foundation
 
 // Skip these directories. Imports should only be repo-relative in libraries
 // and unit tests.
-let skipDirPatterns = ["/Sample/", "/Pods/",
+let skipDirPatterns = ["/Sample/", "/Pods/", "FirebaseAuthExchange/Apps",
                        "FirebaseDynamicLinks/Tests/Integration",
-                       "FirebaseInAppMessaging/Tests/Integration/",
-                       "SymbolCollisionTest/", "/gen/",
+                       "FirebaseInAppMessaging/Tests/Integration/", "SymbolCollisionTest/", "/gen/",
                        "CocoapodsIntegrationTest/", "FirebasePerformance/Tests/TestApp/",
                        "cmake-build-debug/", "build/", "ObjCIntegration/",
                        "FirebasePerformance/Tests/FIRPerfE2E/"] +