wehub-resource-sync
680845cb1c
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78 lines
3.1 KiB
Swift
78 lines
3.1 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
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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 Foundation
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/// A small utility to resolve proxy settings (HTTP(S)_PROXY / NO_PROXY).
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public enum ProxyUtils {
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/// Resolves the proxy URL for a given host based on environment variables.
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/// Malformed http_proxy or https_proxy URLs are ignored.
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/// Uses Go-style handling rules:
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/// - Uppercase environment variables take priority over lowercase counterparts.
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/// - Leading dot on no_proxy component implies prefix matching.
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///
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/// - Parameters:
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/// - scheme: The request scheme.
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/// - host: The request hostname.
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/// - env: Environment variables to check, dafaulting to the process environment.
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///
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/// - Returns: The proxy URL to use, or `nil` for transparent connection.
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public static func proxyFromEnvironment(
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scheme: String?,
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host: String,
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env: [String: String] = ProcessInfo.processInfo.environment
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) -> URL? {
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guard let scheme else {
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return nil
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}
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let httpProxy = env["HTTP_PROXY"] ?? env["http_proxy"]
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let httpsProxy = env["HTTPS_PROXY"] ?? env["https_proxy"]
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let noProxy = env["NO_PROXY"] ?? env["no_proxy"]
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// If NO_PROXY matches → skip proxy
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if let noProxy, shouldBypassProxy(host: host, noProxy: noProxy) {
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return nil
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}
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// Select proxy based on scheme, defaulting to http.
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let proxy = scheme == "https" ? httpsProxy : httpProxy
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guard let proxy, let proxyUrl = URL(string: proxy) else {
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return nil
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}
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return proxyUrl
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}
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/// Check if a host should bypass proxy according to NO_PROXY.
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/// - Example: NO_PROXY=".example.com,localhost,127.0.0.1"
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private static func shouldBypassProxy(host: String, noProxy: String) -> Bool {
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let entries = noProxy.split(separator: ",").map { $0.trimmingCharacters(in: .whitespaces) }
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for entry in entries {
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if entry.isEmpty { continue }
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if entry == "*" { return true }
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if host == entry { return true }
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if entry.hasPrefix("*.") {
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let suffix = String(entry.dropFirst())
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if host.hasSuffix(suffix) { return true }
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}
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if entry.hasPrefix(".") && host.hasSuffix(entry) { return true }
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}
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return false
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}
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}
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