Add enumeration for oauth-token-request

- Added conversion documentation.
- Changed conformance of
OAuthClientCredentialsGrantTokenRequest
to Codable.
- Added grantType in
RefreshTokenGrantTokenRequest.CodingKeys
to ensure TokenRequest is able to properly
decode to and encode from
RefreshTokenGrantTokenRequest.

Author: MasterJ93

Conversion Documentation/oauth-types/oauth-types oauth-token-request conversion.md

@@ -0,0 +1,5 @@
+# Conversion for `oauth-types/src/oauth-token-request.ts`
+
+## `export const oauthTokenRequestSchema`
+
+This has been converted.

Sources/OAuthTypes/OAuthClientCredentialsGrantTokenRequest.swift

@@ -6,7 +6,7 @@
 //
 
 /// A structure representing client credentials grant token requests for OAuth 2.0.
-public struct OAuthClientCredentialsGrantTokenRequest: Decodable {
+public struct OAuthClientCredentialsGrantTokenRequest: Codable {
 
     /// The grant type itself.
     ///

Sources/OAuthTypes/OAuthRefreshTokenGrantTokenRequest.swift

@@ -29,6 +29,7 @@ public struct RefreshTokenGrantTokenRequest: Codable {
     }
 
     enum CodingKeys: String, CodingKey {
+        case grantType = "grant_type"
         case refreshToken = "refresh_token"
     }
 }

Sources/OAuthTypes/OAuthTokenRequest.swift

@@ -0,0 +1,61 @@
+//
+//  OAuthTokenRequest.swift
+//  ATOAuthKit
+//
+//  Created by Christopher Jr Riley on 2025-08-04.
+//
+
+/// An enumeration representing all supported OAuth 2.0 token request types.
+public enum TokenRequest: Codable {
+
+    /// Represents an OAuth 2.0 Authorization Code Grant token request.
+    case oauthAuthorizationCodeGrantTokenRequest(AuthorizationCodeGrantTokenRequest)
+
+    /// Represents an OAuth 2.0 Refresh Token Grant token request.
+    case oauthRefreshTokenGrantTokenRequest(RefreshTokenGrantTokenRequest)
+
+    /// Represents an OAuth 2.0 Resource Owner Password Credentials Grant token request.
+    case oauthPasswordGrantTokenRequest(OAuthPasswordGrantTokenRequest)
+
+    /// Represents an OAuth 2.0 Client Credentials Grant token request.
+    case oauthClientCredentialsGrantTokenRequest(OAuthClientCredentialsGrantTokenRequest)
+
+    public init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        let grantType = try container.decode(String.self, forKey: .grantType)
+
+        switch grantType {
+            case "authorization_code":
+                self = .oauthAuthorizationCodeGrantTokenRequest(try AuthorizationCodeGrantTokenRequest(from: decoder))
+            case "refresh_token":
+                self = .oauthRefreshTokenGrantTokenRequest(try RefreshTokenGrantTokenRequest(from: decoder))
+            case "password":
+                self = .oauthPasswordGrantTokenRequest(try OAuthPasswordGrantTokenRequest(from: decoder))
+            case "client_credentials":
+                self = .oauthClientCredentialsGrantTokenRequest(try OAuthClientCredentialsGrantTokenRequest(from: decoder))
+            default:
+                throw DecodingError.typeMismatch(
+                    TokenRequest.self, DecodingError.Context(
+                        codingPath: decoder.codingPath, debugDescription: "Unknown TokenRequest type"))
+        }
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.singleValueContainer()
+
+        switch self {
+            case .oauthAuthorizationCodeGrantTokenRequest(let value):
+                try container.encode(value)
+            case .oauthRefreshTokenGrantTokenRequest(let value):
+                try container.encode(value)
+            case .oauthPasswordGrantTokenRequest(let value):
+                try container.encode(value)
+            case .oauthClientCredentialsGrantTokenRequest(let value):
+                try container.encode(value)
+        }
+    }
+
+    enum CodingKeys: String, CodingKey {
+        case grantType = "grant_type"
+    }
+}