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104 changes: 104 additions & 0 deletions
104
...ric Playlist Parsing/Pantos-Generic Tag Validators/EXT_X_DATERANGEPlaylistValidator.swift
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| // | ||
| // EXT_X_DATERANGEPlaylistValidator.swift | ||
| // mamba | ||
| // | ||
| // Created by Robert Galluccio on 28/03/2020. | ||
| // Copyright © 2020 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 | ||
|
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| /// This class provides the validation for EXT-X-DATERANGE tags for rules which require the whole playlist information. | ||
| /// | ||
| /// All validation issues for EXT-X-DATERANGE are treated as `.warning` due to this comment in the HLS specification: | ||
| /// | ||
| /// Clients SHOULD ignore EXT-X-DATERANGE tags with illegal syntax. | ||
| /// | ||
| class EXT_X_DATERANGEPlaylistValidator: VariantPlaylistValidator { | ||
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| static func validate(variantPlaylist: VariantPlaylistInterface) -> [PlaylistValidationIssue] { | ||
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| var programDateTimeTagsCount = 0 | ||
| var daterangeTags = [PlaylistTag]() | ||
| for tag in variantPlaylist.tags { | ||
| if tag.tagDescriptor == PantosTag.EXT_X_PROGRAM_DATE_TIME { | ||
| programDateTimeTagsCount += 1 | ||
| } else if tag.tagDescriptor == PantosTag.EXT_X_DATERANGE { | ||
| daterangeTags.append(tag) | ||
| } | ||
| } | ||
|
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| var validationIssues = [PlaylistValidationIssue]() | ||
| validationIssues.append(contentsOf: validateProgramDateTime(programDateTimeTagsCount: programDateTimeTagsCount, daterangeTagsCount: daterangeTags.count)) | ||
| validationIssues.append(contentsOf: validateMultipleTags(daterangeTags: daterangeTags)) | ||
|
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| return validationIssues | ||
| } | ||
|
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| // If a Playlist contains an EXT-X-DATERANGE tag, it MUST also contain | ||
| // at least one EXT-X-PROGRAM-DATE-TIME tag. | ||
| private static func validateProgramDateTime(programDateTimeTagsCount: Int, daterangeTagsCount: Int) -> [PlaylistValidationIssue] { | ||
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| guard daterangeTagsCount > 0, programDateTimeTagsCount == 0 else { | ||
| return [] | ||
| } | ||
| return [PlaylistValidationIssue(description: .EXT_X_DATERANGEExistsWithNoEXT_X_PROGRAM_DATE_TIME, severity: .warning)] | ||
| } | ||
|
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| // If a Playlist contains two EXT-X-DATERANGE tags with the same ID | ||
| // attribute value, then any AttributeName that appears in both tags | ||
| // MUST have the same AttributeValue. | ||
| private static func validateMultipleTags(daterangeTags: [PlaylistTag]) -> [PlaylistValidationIssue] { | ||
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| // first fill out a map of ID to tags to group tags with matching ID | ||
| var idTagMap = [String: [PlaylistTag]]() | ||
| for tag in daterangeTags { | ||
| guard let id = tag.value(forValueIdentifier: PantosValue.id) else { | ||
| // This should not happen, but if it does, this is a validation issue that will be caught by the tag validator | ||
| continue | ||
| } | ||
| if let matchingTags = idTagMap[id] { | ||
| idTagMap[id] = matchingTags + [tag] | ||
| } else { | ||
| idTagMap[id] = [tag] | ||
| } | ||
| } | ||
| // next we pick out ID values with multiple tags and validate the attributes match between them | ||
| var validationIssues = [PlaylistValidationIssue]() | ||
| for (_, tags) in idTagMap { | ||
| guard tags.count > 1 else { | ||
| continue | ||
| } | ||
| // make a map of attributes to values to ensure any matching attributes also match value | ||
| var attributeToValueMap = [String: String]() | ||
| for tag in tags { | ||
| for attribute in tag.keys { | ||
| guard let attributeValue = tag.value(forKey: attribute) else { | ||
| assertionFailure("tag.keys gave us a key that had no value in the tag - key: \(attribute), tag: \(tag), tag.keys: \(tag.keys)") | ||
| continue | ||
| } | ||
| if let matchingAttributeValue = attributeToValueMap[attribute] { | ||
| if attributeValue != matchingAttributeValue { | ||
| validationIssues.append(PlaylistValidationIssue(description: .EXT_X_DATERANGEAttributeMismatchForTagsWithSameID, severity: .warning)) | ||
| } | ||
| } else { | ||
| attributeToValueMap[attribute] = attributeValue | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| return validationIssues | ||
| } | ||
| } |
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