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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| // | ||
| // Copyright RevenueCat Inc. All Rights Reserved. | ||
| // | ||
| // Licensed under the MIT License (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://opensource.org/licenses/MIT | ||
| // | ||
| // HTTPRequest+Signing.swift | ||
| // | ||
| // Created by Nacho Soto on 11/16/23. | ||
|
|
||
| import CryptoKit | ||
| import Foundation | ||
|
|
||
| extension HTTPRequest { | ||
|
|
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| static func headerParametersForSignatureHeader(headers: Headers) -> String? { | ||
| guard #available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.2, *) else { | ||
| // Signature verification is not available. | ||
| return nil | ||
| } | ||
|
|
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| let headersToSign = Self.headersToSign.map(\.rawValue) | ||
|
|
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| if !headersToSign.isEmpty, let hash = Self.postParameterHash(headers) { | ||
| return Self.signatureHashHeader(keys: headersToSign, hash: hash) | ||
| } else { | ||
| return nil | ||
| } | ||
| } | ||
|
|
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| /// - Returns: `nil` if none of the requested headers are found | ||
| @available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.2, *) | ||
| private static func postParameterHash(_ headers: Headers) -> String? { | ||
| let headersToSign = Self.headersToSign.map(\.rawValue) | ||
| let values = headers | ||
| .filter { headersToSign.contains($0.key) } | ||
| .map(\.value) | ||
|
|
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| guard !values.isEmpty else { return nil } | ||
|
|
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| return Self.signingParameterHash(values) | ||
| } | ||
|
|
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| } | ||
|
|
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| extension HTTPRequest { | ||
|
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| static func signatureHashHeader( | ||
| keys: [String], | ||
| hash: String | ||
| ) -> String { | ||
| return [ | ||
| keys.joined(separator: ","), | ||
| postParameterHashingAlgorithmName, | ||
| hash | ||
| ].joined(separator: ":") | ||
| } | ||
|
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| @available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.2, *) | ||
| static func signingParameterHash(_ values: [String]) -> String { | ||
| var sha256 = SHA256() | ||
|
|
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| for (index, value) in values.enumerated() { | ||
| if index > 0 { | ||
| sha256.update(data: fieldSeparator) | ||
| } | ||
|
|
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| sha256.update(data: value.asData) | ||
| } | ||
|
|
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| return sha256.toString() | ||
| } | ||
|
|
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| } | ||
|
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| // MARK: - Private | ||
|
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| private extension HTTPRequest { | ||
|
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| /// Ordered list of header keys that will be included in the signature. | ||
| static let headersToSign: [HTTPClient.RequestHeader] = [ | ||
| .sandbox | ||
| ] | ||
|
|
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| } | ||
|
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| private let postParameterHashingAlgorithmName = "sha256" | ||
| private let fieldSeparator = Data(bytes: [0x00], count: 1) |
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