mirror of
https://github.com/apple/container.git
synced 2026-09-09 17:25:36 +00:00
Alexey Makhov
689af841d6
The digest is calculated based on written json data, but JSONEncoder doesn't preserve order bby default, so the digest is not consistent. Signed-off-by: Alexey <makhov.alex@gmail.com>
72 lines
2.9 KiB
Swift
72 lines
2.9 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025 Apple Inc. and the Containerization project authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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import ContainerizationError
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import Crypto
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import Foundation
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import NIOCore
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/// Provides a context to write data into a directory.
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public class ContentWriter {
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private let base: URL
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private let encoder = JSONEncoder()
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/// Create a new ContentWriter.
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/// - Parameters:
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/// - base: The URL to write content to. If this is not a directory a
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/// ContainerizationError will be thrown with a code of .internalError.
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public init(for base: URL) throws {
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self.encoder.outputFormatting = [JSONEncoder.OutputFormatting.sortedKeys]
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self.base = base
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var isDirectory = ObjCBool(true)
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let exists = FileManager.default.fileExists(atPath: base.path, isDirectory: &isDirectory)
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guard exists && isDirectory.boolValue else {
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throw ContainerizationError(.internalError, message: "Cannot create ContentWriter for path \(base.absolutePath()). Not a directory")
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}
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}
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/// Writes the data blob to the base URL provided in the constructor.
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/// - Parameters:
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/// - data: The data blob to write to a file under the base path.
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@discardableResult
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public func write(_ data: Data) throws -> (size: Int64, digest: SHA256.Digest) {
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let digest = SHA256.hash(data: data)
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let destination = base.appendingPathComponent(digest.encoded)
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try data.write(to: destination)
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return (Int64(data.count), digest)
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}
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/// Reads the data present in the passed in URL and writes it to the base path.
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/// - Parameters:
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/// - url: The URL to read the data from.
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@discardableResult
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public func create(from url: URL) throws -> (size: Int64, digest: SHA256.Digest) {
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let data = try Data(contentsOf: url)
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return try self.write(data)
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}
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/// Encodes the passed in type as a JSON blob and writes it to the base path.
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/// - Parameters:
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/// - content: The type to convert to JSON.
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@discardableResult
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public func create<T: Encodable>(from content: T) throws -> (size: Int64, digest: SHA256.Digest) {
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let data = try self.encoder.encode(content)
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return try self.write(data)
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}
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}
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