Add missing multivariant playlist tags and attributes from draft 15 (Targeting version 2.x)

mamba.xcodeproj/project.pbxproj

@@ -8,6 +8,21 @@
 
 /* Begin PBXBuildFile section */
 		01CD2E7A1DE4D46F002510E7 /* EXT_X_MAPTagParserTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 01CD2E791DE4D46F002510E7 /* EXT_X_MAPTagParserTests.swift */; };
+		1447582D2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */; };
+		1447582E2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */; };
+		1447582F2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */; };
+		144758312C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */; };
+		144758322C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */; };
+		144758332C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */; };
+		144758352C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */; };
+		144758362C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */; };
+		144758372C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */; };
+		144758392C8620C000D12CCD /* ChannelsTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758382C8620C000D12CCD /* ChannelsTests.swift */; };
+		1447583A2C8620C000D12CCD /* ChannelsTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758382C8620C000D12CCD /* ChannelsTests.swift */; };
+		1447583B2C8620C000D12CCD /* ChannelsTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758382C8620C000D12CCD /* ChannelsTests.swift */; };
+		1447583D2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */; };
+		1447583E2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */; };
+		1447583F2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */; };
 		1D28F3451EAA9E500010320B /* hls_ad_master_playlist.m3u8 in Resources */ = {isa = PBXBuildFile; fileRef = 1D28F3401EAA9E500010320B /* hls_ad_master_playlist.m3u8 */; };
 		1D28F3461EAA9E500010320B /* hls_ad_variant_playlist.m3u8 in Resources */ = {isa = PBXBuildFile; fileRef = 1D28F3411EAA9E500010320B /* hls_ad_variant_playlist.m3u8 */; };
 		1D28F3471EAA9E500010320B /* hls_master_playlist_sap.m3u8 in Resources */ = {isa = PBXBuildFile; fileRef = 1D28F3421EAA9E500010320B /* hls_master_playlist_sap.m3u8 */; };
@@ -635,6 +650,11 @@
 
 /* Begin PBXFileReference section */
 		01CD2E791DE4D46F002510E7 /* EXT_X_MAPTagParserTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = EXT_X_MAPTagParserTests.swift; sourceTree = "<group>"; };
+		1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EXT_X_SESSION_KEYValidator.swift; sourceTree = "<group>"; };
+		144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EXT_X_SESSION_DATATagValidator.swift; sourceTree = "<group>"; };
+		144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EXT_X_SESSION_DATAPlaylistValidator.swift; sourceTree = "<group>"; };
+		144758382C8620C000D12CCD /* ChannelsTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ChannelsTests.swift; sourceTree = "<group>"; };
+		1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VideoLayoutTests.swift; sourceTree = "<group>"; };
 		1D28F3401EAA9E500010320B /* hls_ad_master_playlist.m3u8 */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = hls_ad_master_playlist.m3u8; sourceTree = "<group>"; };
 		1D28F3411EAA9E500010320B /* hls_ad_variant_playlist.m3u8 */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = hls_ad_variant_playlist.m3u8; sourceTree = "<group>"; };
 		1D28F3421EAA9E500010320B /* hls_master_playlist_sap.m3u8 */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = hls_master_playlist_sap.m3u8; sourceTree = "<group>"; };
@@ -930,6 +950,9 @@
 				EC3B01A11DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupNAMEValidator.swift */,
 				EC3B01A21DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupTYPEValidator.swift */,
 				43DE4EFC1E564DBE00EEE800 /* EXT_X_MEDIARenditionINSTREAMIDValidator.swift */,
+				144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */,
+				144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */,
+				1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */,
 				43DE4EFA1E564DA300EEE800 /* EXT_X_STARTTimeOffsetValidator.swift */,
 				EC3B01A31DD4D47900B512E3 /* EXT_X_STREAM_INFRenditionGroupValidator.swift */,
 				EC3B01A41DD4D47900B512E3 /* EXT_X_TARGETDURATIONLengthValidator.swift */,
@@ -1318,10 +1341,12 @@
 		EC9BCAA21D749D8B0032BEBE /* Value Types */ = {
 			isa = PBXGroup;
 			children = (
+				144758382C8620C000D12CCD /* ChannelsTests.swift */,
 				EC7492AF1DD29F8900AF4E20 /* CodecArrayTests.swift */,
 				EC7492B01DD29F8900AF4E20 /* MediaTypeTests.swift */,
-				EC7492B21DD29F8900AF4E20 /* ResolutionTests.swift */,
 				EC7492B11DD29F8900AF4E20 /* PlaylistTypeTests.swift */,
+				EC7492B21DD29F8900AF4E20 /* ResolutionTests.swift */,
+				1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */,
 			);
 			path = "Value Types";
 			sourceTree = "<group>";
@@ -1773,6 +1798,7 @@
 				EC7491811DD29C3500AF4E20 /* String+Trim.swift in Sources */,
 				EC7491C31DD29D5C00AF4E20 /* PlaylistValidationIssue.swift in Sources */,
 				ECDE184C22383230008566BB /* PlaylistParser.swift in Sources */,
+				144758352C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */,
 				EC74916E1DD29B5D00AF4E20 /* CollectionType+FindExtensions.swift in Sources */,
 				EC7491DA1DD29D9600AF4E20 /* GenericNoDataTagParser.swift in Sources */,
 				EC7491C91DD29D5C00AF4E20 /* PlaylistWriter.swift in Sources */,
@@ -1847,6 +1873,8 @@
 				EC349ACE2236C3A60077432B /* PlaylistStructureInterface.swift in Sources */,
 				EC3B01A71DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupAUTOSELECTValidator.swift in Sources */,
 				F700CD391E78A2BE001C9487 /* MambaStringRef_ConcreteNSString.m in Sources */,
+				144758312C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */,
+				1447582D2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */,
 				43DE4EFB1E564DA300EEE800 /* EXT_X_STARTTimeOffsetValidator.swift in Sources */,
 				EC74918A1DD29CCB00AF4E20 /* StringDictionaryParser.swift in Sources */,
 				ECDE184022381146008566BB /* MasterPlaylist.swift in Sources */,
@@ -1930,8 +1958,10 @@
 				ECFBD9101E5CCC2200379FC2 /* ParseArrayTests.m in Sources */,
 				EC7492B31DD29F8900AF4E20 /* CodecArrayTests.swift in Sources */,
 				01CD2E7A1DE4D46F002510E7 /* EXT_X_MAPTagParserTests.swift in Sources */,
+				144758392C8620C000D12CCD /* ChannelsTests.swift in Sources */,
 				EC7492AB1DD29F7000AF4E20 /* OrderedDictionaryTests.swift in Sources */,
 				EC7492781DD29EC800AF4E20 /* EXT_X_MEDIATagParserTests.swift in Sources */,
+				1447583D2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -1945,6 +1975,7 @@
 				EC3B01AA1DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupDEFAULTValidator.swift in Sources */,
 				EC3B01C41DD4D49A00B512E3 /* PlaylistOneToManyValidator.swift in Sources */,
 				ECDE184D22383230008566BB /* PlaylistParser.swift in Sources */,
+				144758362C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */,
 				EC7491821DD29C3500AF4E20 /* String+Trim.swift in Sources */,
 				EC7491C41DD29D5C00AF4E20 /* PlaylistValidationIssue.swift in Sources */,
 				EC74916F1DD29B5D00AF4E20 /* CollectionType+FindExtensions.swift in Sources */,
@@ -2019,6 +2050,8 @@
 				EC349ACF2236C3A60077432B /* PlaylistStructureInterface.swift in Sources */,
 				EC7491471DD299B400AF4E20 /* PlaylistTypes.swift in Sources */,
 				F700CD3A1E78A2BE001C9487 /* MambaStringRef_ConcreteNSString.m in Sources */,
+				144758322C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */,
+				1447582E2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */,
 				EC3B01A81DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupAUTOSELECTValidator.swift in Sources */,
 				EC74918B1DD29CCB00AF4E20 /* StringDictionaryParser.swift in Sources */,
 				ECDE184122381146008566BB /* MasterPlaylist.swift in Sources */,
@@ -2102,8 +2135,10 @@
 				ECFBD9111E5CCC2200379FC2 /* ParseArrayTests.m in Sources */,
 				EC7492B81DD29F8900AF4E20 /* PlaylistTypeTests.swift in Sources */,
 				EC7492B41DD29F8900AF4E20 /* CodecArrayTests.swift in Sources */,
+				1447583A2C8620C000D12CCD /* ChannelsTests.swift in Sources */,
 				EC7492AC1DD29F7000AF4E20 /* OrderedDictionaryTests.swift in Sources */,
 				EC7492791DD29EC800AF4E20 /* EXT_X_MEDIATagParserTests.swift in Sources */,
+				1447583E2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -2118,6 +2153,7 @@
 				EC1CCD32209A2CF9006B59FF /* String+Trim.swift in Sources */,
 				EC1CCD46209A2CF9006B59FF /* GenericSingleTagValidator.swift in Sources */,
 				ECDE184E22383230008566BB /* PlaylistParser.swift in Sources */,
+				144758372C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */,
 				EC1CCD30209A2CF9006B59FF /* String+DateParsing.swift in Sources */,
 				EC1CCD53209A2CF9006B59FF /* GenericDictionaryTagWriter.swift in Sources */,
 				EC1CCD55209A2CF9006B59FF /* GenericTagWriter.swift in Sources */,
@@ -2189,7 +2225,9 @@
 				EC1CCD4F209A2CF9006B59FF /* PlaylistTagCardinalityValidation.swift in Sources */,
 				EC1CCD2B209A2CF9006B59FF /* IndeterminateBool.swift in Sources */,
 				EC349AD02236C3A60077432B /* PlaylistStructureInterface.swift in Sources */,
+				144758332C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */,
 				EC1CCD43209A2CF9006B59FF /* EXT_X_STREAM_INFRenditionGroupValidator.swift in Sources */,
+				1447582F2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */,
 				EC1CCD35209A2CF9006B59FF /* StringDictionaryParser.swift in Sources */,
 				EC1CCD02209A2CF9006B59FF /* MambaStringRef_ConcreteNSString.m in Sources */,
 				EC1CCD38209A2CF9006B59FF /* GenericNoDataTagParser.swift in Sources */,
@@ -2272,10 +2310,12 @@
 				ECE253FD209A50B500D388CE /* ThirdPartyTagListSupportTests.swift in Sources */,
 				ECE25408209A50B500D388CE /* ResolutionTests.swift in Sources */,
 				ECE253F6209A50B500D388CE /* GenericSingleValueTagParserTests.swift in Sources */,
+				1447583B2C8620C000D12CCD /* ChannelsTests.swift in Sources */,
 				ECE253FA209A50B500D388CE /* GenericSingleTagValidatorTests.swift in Sources */,
 				ECE253F1209A50B500D388CE /* EXT_X_KEYTagParserTests.swift in Sources */,
 				ECE25403209A50B500D388CE /* String+Helio.swift in Sources */,
 				ECE25400209A50B500D388CE /* IndeterminateBoolTests.swift in Sources */,
+				1447583F2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

mambaSharedFramework/Pantos-Generic Playlist Parsing/Pantos-Generic Tag Validators/EXT_X_SESSION_DATAPlaylistValidator.swift

@@ -0,0 +1,52 @@
+//
+//  EXT_X_SESSION_DATAPlaylistValidator.swift
+//  mamba
+//
+//  Created by Robert Galluccio on 8/31/24.
+//  Copyright © 2024 Comcast Corporation.
+//  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
+//
+//  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. All rights reserved.
+//
+
+import Foundation
+
+final class EXT_X_SESSION_DATAPlaylistValidator: MasterPlaylistValidator {
+    static func validate(masterPlaylist: any MasterPlaylistInterface) -> [PlaylistValidationIssue] {
+        var issues = [PlaylistValidationIssue]()
+
+        if let issue = duplicateIssue(
+            tags: masterPlaylist.tags.filter { $0.tagDescriptor == PantosTag.EXT_X_SESSION_DATA }
+        ) {
+            issues.append(issue)
+        }
+
+        return issues
+    }
+
+    // A Playlist MAY contain multiple EXT-X-SESSION-DATA tags with the same DATA-ID attribute. A Playlist MUST NOT
+    // contain more than one EXT-X-SESSION-DATA tag with the same DATA-ID attribute and the same LANGUAGE attribute.
+    private static func duplicateIssue(tags: [PlaylistTag]) -> PlaylistValidationIssue? {
+        var dataIdToLanguagesMap = [String: [String?]]()
+        for tag in tags {
+            guard let dataId = tag.value(forValueIdentifier: PantosValue.dataId) else { continue }
+            var existingLanguages = dataIdToLanguagesMap[dataId] ?? []
+            existingLanguages.append(tag.value(forValueIdentifier: PantosValue.language))
+            dataIdToLanguagesMap[dataId] = existingLanguages
+        }
+        for languages in dataIdToLanguagesMap.values {
+            if languages.count != Set(languages).count {
+                return PlaylistValidationIssue(description: .EXT_X_SESSION_DATAPlaylistValidator, severity: .error)
+            }
+        }
+        return nil
+    }
+}

mambaSharedFramework/Pantos-Generic Playlist Parsing/Pantos-Generic Tag Validators/EXT_X_SESSION_DATATagValidator.swift

@@ -0,0 +1,71 @@
+//
+//  EXT_X_SESSION_DATATagValidator.swift
+//  mamba
+//
+//  Created by Robert Galluccio on 8/31/24.
+//  Copyright © 2024 Comcast Corporation.
+//  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
+//
+//  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. All rights reserved.
+//
+
+import Foundation
+
+struct EXT_X_SESSION_DATATagValidator: PlaylistTagValidator {
+    private var genericValidator: GenericDictionaryTagValidator
+
+    init() {
+        genericValidator = GenericDictionaryTagValidator(
+            tag: PantosTag.EXT_X_SESSION_DATA,
+            dictionaryValueIdentifiers: [
+                DictionaryTagValueIdentifierImpl(
+                    valueId: PantosValue.dataId,
+                    optional: false,
+                    expectedType: String.self
+                ),
+                DictionaryTagValueIdentifierImpl(
+                    valueId: PantosValue.value,
+                    optional: true,
+                    expectedType: String.self
+                ),
+                DictionaryTagValueIdentifierImpl(
+                    valueId: PantosValue.uri,
+                    optional: true,
+                    expectedType: String.self
+                ),
+                DictionaryTagValueIdentifierImpl(
+                    valueId: PantosValue.format,
+                    optional: true,
+                    expectedType: SessionDataFormat.self
+                ),
+                DictionaryTagValueIdentifierImpl(
+                    valueId: PantosValue.language,
+                    optional: true,
+                    expectedType: String.self
+                ),
+            ]
+        )
+    }
+
+    func validate(tag: PlaylistTag) -> [PlaylistValidationIssue]? {
+        var issueList = genericValidator.validate(tag: tag) ?? []
+
+        // Each EXT-X-SESSION-DATA tag MUST contain either a VALUE or URI attribute, but not both.
+        switch (tag.value(forValueIdentifier: PantosValue.value), tag.value(forValueIdentifier: PantosValue.uri)) {
+        case (.none, .some), (.some, .none):
+            break
+        case (.some, .some), (.none, .none):
+            issueList.append(PlaylistValidationIssue(description: .EXT_X_SESSION_DATATagValidator, severity: .error))
+        }
+
+        return issueList.isEmpty ? nil : issueList
+    }
+}

mambaSharedFramework/Pantos-Generic Playlist Parsing/Pantos-Generic Tag Validators/EXT_X_SESSION_KEYValidator.swift

@@ -0,0 +1,63 @@
+//
+//  EXT_X_SESSION_KEYValidator.swift
+//  mamba
+//
+//  Created by Robert Galluccio on 8/31/24.
+//  Copyright © 2024 Comcast Corporation.
+//  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
+//
+//  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. All rights reserved.
+//
+
+import Foundation
+
+// All attributes defined for the EXT-X-KEY tag (Section 4.4.4.4) are also defined for the
+// EXT-X-SESSION-KEY, except that the value of the METHOD attribute MUST NOT be NONE.
+struct EXT_X_SESSION_KEYValidator: PlaylistTagValidator {
+    private let keyValidator: EXT_X_KEYValidator
+
+    init() {
+        keyValidator = EXT_X_KEYValidator(tag: PantosTag.EXT_X_SESSION_KEY, dictionaryValueIdentifiers: [
+            DictionaryTagValueIdentifierImpl(valueId: PantosValue.method,
+                                             optional: false,
+                                             expectedType: EncryptionMethodType.self),
+            DictionaryTagValueIdentifierImpl(valueId: PantosValue.uri,
+                                             optional: false, // URI is REQUIRED since METHOD can't be NONE
+                                             expectedType: String.self),
+            DictionaryTagValueIdentifierImpl(valueId: PantosValue.ivector,
+                                             optional: true,
+                                             expectedType: String.self),
+            DictionaryTagValueIdentifierImpl(valueId: PantosValue.keyformat,
+                                             optional: true,
+                                             expectedType: String.self),
+            DictionaryTagValueIdentifierImpl(valueId: PantosValue.keyformatVersions,
+                                             optional: true,
+                                             expectedType: String.self)
+        ])
+    }
+
+    public func validate(tag: PlaylistTag) -> [PlaylistValidationIssue]? {
+        var issueList = keyValidator.validate(tag: tag) ?? []
+
+        if let method = tag.value(forValueIdentifier: PantosValue.method) {
+            if method == EncryptionMethodType.EncryptionMethod.None.rawValue {
+                issueList.append(
+                    PlaylistValidationIssue(
+                        description: IssueDescription.EXT_X_SESSION_KEYValidator,
+                        severity: IssueSeverity.error
+                    )
+                )
+            }
+        }
+
+        return issueList.isEmpty ? nil : issueList
+    }
+}