SES time zone (#135)

motivation: Sometimes common header date comes with an alphabetical timezone in brackets after the numeric timezone

changes:
* Support common header date format with brackets
* Update readme with SES Event link

Author: adam-fowler

Sources/AWSLambdaEvents/Utils/DateWrappers.swift

@@ -80,10 +80,15 @@ public struct RFC5322DateTimeCoding: Decodable {
 
     public init(from decoder: Decoder) throws {
         let container = try decoder.singleValueContainer()
-        let dateString = try container.decode(String.self)
-        guard let date = Self.dateFormatter.date(from: dateString) else {
+        var string = try container.decode(String.self)
+        // RFC5322 dates sometimes have the alphabetic version of the timezone in brackets after the numeric version. The date formatter
+        // fails to parse this so we need to remove this before parsing.
+        if let bracket = string.firstIndex(of: "(") {
+            string = String(string[string.startIndex ..< bracket].trimmingCharacters(in: .whitespaces))
+        }
+        guard let date = Self.dateFormatter.date(from: string) else {
             throw DecodingError.dataCorruptedError(in: container, debugDescription:
-                "Expected date to be in RFC5322 date-time format with fractional seconds, but `\(dateString)` does not forfill format")
+                "Expected date to be in RFC5322 date-time format with fractional seconds, but `\(string)` does not forfill format")
         }
         self.wrappedValue = date
     }

Tests/AWSLambdaEventsTests/Utils/DateWrapperTests.swift

@@ -93,6 +93,32 @@ class DateWrapperTests: XCTestCase {
         XCTAssertEqual(event?.date.description, "2012-04-05 21:47:37 +0000")
     }
 
+    func testRFC5322DateTimeCodingWrapperWithExtraTimeZoneSuccess() {
+        struct TestEvent: Decodable {
+            @RFC5322DateTimeCoding
+            var date: Date
+        }
+
+        let json = #"{"date":"Fri, 26 Jun 2020 03:04:03 -0500 (CDT)"}"#
+        var event: TestEvent?
+        XCTAssertNoThrow(event = try JSONDecoder().decode(TestEvent.self, from: json.data(using: .utf8)!))
+
+        XCTAssertEqual(event?.date.description, "2020-06-26 08:04:03 +0000")
+    }
+
+    func testRFC5322DateTimeCodingWrapperWithAlphabeticTimeZoneSuccess() {
+        struct TestEvent: Decodable {
+            @RFC5322DateTimeCoding
+            var date: Date
+        }
+
+        let json = #"{"date":"Fri, 26 Jun 2020 03:04:03 CDT"}"#
+        var event: TestEvent?
+        XCTAssertNoThrow(event = try JSONDecoder().decode(TestEvent.self, from: json.data(using: .utf8)!))
+
+        XCTAssertEqual(event?.date.description, "2020-06-26 08:04:03 +0000")
+    }
+
     func testRFC5322DateTimeCodingWrapperFailure() {
         struct TestEvent: Decodable {
             @RFC5322DateTimeCoding

readme.md

@@ -337,6 +337,7 @@ AWS Lambda functions can be invoked directly from the AWS Lambda console UI, AWS
 
 * [APIGateway Proxy](https://docs.aws.amazon.com/lambda/latest/dg/services-apigateway.html)
 * [S3 Events](https://docs.aws.amazon.com/lambda/latest/dg/with-s3.html)
+* [SES Events](https://docs.aws.amazon.com/lambda/latest/dg/services-ses.html)
 * [SNS Events](https://docs.aws.amazon.com/lambda/latest/dg/with-sns.html)
 * [SQS Events](https://docs.aws.amazon.com/lambda/latest/dg/with-sqs.html)
 * [CloudWatch Events](https://docs.aws.amazon.com/lambda/latest/dg/services-cloudwatchevents.html)