From c5c80318af89fc2d570453840f168565fcf16466 Mon Sep 17 00:00:00 2001
From: "byungmin.kang" <byungmin.kang@snowcorp.com>
Date: Thu, 21 Jul 2022 11:58:01 +0900
Subject: [PATCH] Add array to URLEncodedSerialization

---
 .../APIKit/Serializations/URLEncodedSerialization.swift   | 8 ++++++++
 .../BodyParametersType/URLEncodedSerializationTests.swift | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/Sources/APIKit/Serializations/URLEncodedSerialization.swift b/Sources/APIKit/Serializations/URLEncodedSerialization.swift
index 1c13425d..7aad0a93 100644
--- a/Sources/APIKit/Serializations/URLEncodedSerialization.swift
+++ b/Sources/APIKit/Serializations/URLEncodedSerialization.swift
@@ -94,6 +94,14 @@ public final class URLEncodedSerialization {
                 return "\(escape(key))"
             }
 
+            if let valueAsArray = value as? Array<Any> {
+                 let escapedKeyForArray = escape(key)
+                 return valueAsArray.map { (element: Any) -> String in
+                     let elementAsString = (element as? String) ?? "\(element)"
+                     return "\(escapedKeyForArray)=\(escape(elementAsString))"
+                     }.joined(separator: "&")
+             }
+            
             let valueAsString = (value as? String) ?? "\(value)"
             return "\(escape(key))=\(escape(valueAsString))"
         }
diff --git a/Tests/APIKitTests/BodyParametersType/URLEncodedSerializationTests.swift b/Tests/APIKitTests/BodyParametersType/URLEncodedSerializationTests.swift
index 89702e4d..a839907c 100644
--- a/Tests/APIKitTests/BodyParametersType/URLEncodedSerializationTests.swift
+++ b/Tests/APIKitTests/BodyParametersType/URLEncodedSerializationTests.swift
@@ -10,6 +10,14 @@ class URLEncodedSerializationTests: XCTestCase {
         XCTAssertEqual(object?["key1"], "value1")
         XCTAssertEqual(object?["key2"], "value2")
     }
+    
+    func testObjectFromArray() {
+        let parameters: [String : Any] = ["foo": "bar", "array" : ["first", "second"]]
+        let serailizedString = URLEncodedSerialization.string(from: parameters)
+        XCTAssertTrue(serailizedString.contains("foo=bar"))
+        XCTAssertTrue(serailizedString.contains("array=first"))
+        XCTAssertTrue(serailizedString.contains("array=second"))
+    }
 
     func testInvalidFormatString() {
         let string = "key==value&"