EnvironmentVariables.cs

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Headers;

namespace Azure.Identity
{
    internal class EnvironmentVariables
    {
        public static string Username => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_USERNAME"));
        public static string Password => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_PASSWORD"));
        public static string TenantId => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_TENANT_ID"));
        public static List<string> AdditionallyAllowedTenants => (Environment.GetEnvironmentVariable("AZURE_ADDITIONALLY_ALLOWED_TENANTS") ?? string.Empty).Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries).ToList();
        public static string ClientId => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_CLIENT_ID"));
        public static string ClientSecret => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_CLIENT_SECRET"));
        public static string ClientCertificatePath => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_CLIENT_CERTIFICATE_PATH"));
        public static string ClientCertificatePassword => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_CLIENT_CERTIFICATE_PASSWORD"));
        public static bool ClientSendCertificateChain => EnvironmentVariableToBool(Environment.GetEnvironmentVariable("AZURE_CLIENT_SEND_CERTIFICATE_CHAIN"));

        public static string IdentityEndpoint => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("IDENTITY_ENDPOINT"));
        public static string IdentityHeader => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("IDENTITY_HEADER"));
        public static string MsiEndpoint => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("MSI_ENDPOINT"));
        public static string MsiSecret => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("MSI_SECRET"));
        public static string ImdsEndpoint => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("IMDS_ENDPOINT"));
        public static string IdentityServerThumbprint => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("IDENTITY_SERVER_THUMBPRINT"));
        public static string PodIdentityEndpoint => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_POD_IDENTITY_AUTHORITY_HOST"));

        public static string Path => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("PATH"));

        public static string ProgramFilesX86 => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("ProgramFiles(x86)"));
        public static string ProgramFiles => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("ProgramFiles"));
        public static string AuthorityHost => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_AUTHORITY_HOST"));

        public static string AzureRegionalAuthorityName => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_REGIONAL_AUTHORITY_NAME"));

        public static string AzureFederatedTokenFile => GetNonEmptyStringOrNull(Environment.GetEnvironmentVariable("AZURE_FEDERATED_TOKEN_FILE"));

        private static string GetNonEmptyStringOrNull(string str)
        {
            return !string.IsNullOrEmpty(str) ? str : null;
        }

        private static bool EnvironmentVariableToBool(string str)
        {
            return (string.Equals(bool.TrueString, str, StringComparison.OrdinalIgnoreCase) || string.Equals("1", str, StringComparison.OrdinalIgnoreCase));
        }
    }
}