wehub-resource-sync
109 lines
4.2 KiB
C#
109 lines
4.2 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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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 http://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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using System.Globalization;
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using System.Text.RegularExpressions;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// Provides methods for validating strings following a certain format, such as an email address
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/// </summary>
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public static class Validate
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{
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/// <summary>
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/// Validates the provided email address
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/// </summary>
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/// <remarks>
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/// Implementation taken from msdn (with slight refactoring for readability and C#6 compliance):
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/// https://docs.microsoft.com/en-us/dotnet/standard/base-types/how-to-verify-that-strings-are-in-valid-email-format
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/// </remarks>
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/// <param name="emailAddress">The email address to be validated</param>
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/// <returns>True if the provided email address is valid</returns>
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public static bool EmailAddress(string emailAddress)
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{
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if (emailAddress == null)
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{
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return true;
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}
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if (string.IsNullOrWhiteSpace(emailAddress))
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{
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return false;
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}
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emailAddress = NormalizeEmailAddressDomainName(emailAddress);
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if (emailAddress == null)
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{
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// an error occurred during domain name normalization
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return false;
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}
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try
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{
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return RegularExpression.Email.IsMatch(emailAddress);
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}
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catch
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{
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return false;
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}
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}
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private static string NormalizeEmailAddressDomainName(string emailAddress)
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{
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try
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{
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// Normalize the domain
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emailAddress = RegularExpression.EmailDomainName.Replace(emailAddress, match =>
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{
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// Use IdnMapping class to convert Unicode domain names.
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var idn = new IdnMapping();
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// Pull out and process domain name (throws ArgumentException on invalid)
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var domainName = idn.GetAscii(match.Groups[2].Value);
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return match.Groups[1].Value + domainName;
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});
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}
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catch
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{
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return null;
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}
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return emailAddress;
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}
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/// <summary>
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/// Provides static storage of compiled regular expressions to preclude parsing on each invocation
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/// </summary>
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public static class RegularExpression
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{
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/// <summary>
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/// Matches the domain name in an email address ignored@[domain.com]
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/// Pattern sourced via msdn:
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/// https://docs.microsoft.com/en-us/dotnet/standard/base-types/how-to-verify-that-strings-are-in-valid-email-format
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/// </summary>
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public static readonly Regex EmailDomainName = new Regex(@"(@)(.+)$", RegexOptions.Compiled);
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/// <summary>
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/// Matches a valid email address address@sub.domain.com
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/// Pattern sourced via msdn:
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/// https://docs.microsoft.com/en-us/dotnet/standard/base-types/how-to-verify-that-strings-are-in-valid-email-format
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/// </summary>
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public static readonly Regex Email = new Regex(@"^(?("")("".+?(?<!\\)""@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-z])@))(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-0-9a-z]*[0-9a-z]*\.)+[a-z0-9][\-a-z0-9]{0,22}[a-z0-9]))$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
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}
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}
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}
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