124 lines
4.1 KiB
C#
124 lines
4.1 KiB
C#
using System;
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using System.Web;
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using Xamarin.Forms;
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namespace Bit.App.Utilities
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{
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/**
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* Helper class to format a password with numeric encoding to separate
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* normal text from numbers and special characters.
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*/
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class PasswordFormatter
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{
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/**
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* This enum is used for the state machine when building the colorized
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* password string.
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*/
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private enum CharType
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{
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None,
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Normal,
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Number,
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Special
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}
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public static string FormatPassword(string password)
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{
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if (password == null)
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{
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return string.Empty;
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}
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// First two digits of returned hex code contains the alpha,
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// which is not supported in HTML color, so we need to cut those out.
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var normalColor = $"<span style=\"color:#{ThemeManager.GetResourceColor("TextColor").ToHex().Substring(3)}\">";
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var numberColor = $"<span style=\"color:#{ThemeManager.GetResourceColor("PasswordNumberColor").ToHex().Substring(3)}\">";
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var specialColor = $"<span style=\"color:#{ThemeManager.GetResourceColor("PasswordSpecialColor").ToHex().Substring(3)}\">";
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var result = string.Empty;
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// iOS won't hide the zero-width space char without these div attrs, but Android won't respect
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// display:inline-block and adds a newline after the password. Hence, only iOS gets the div.
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if (Device.RuntimePlatform == Device.iOS)
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{
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result += "<div style=\"display:inline-block; align-items:center; justify-content:center; text-align:center; word-break:break-all; white-space:pre-wrap; min-width:0\">";
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}
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// Start with an otherwise uncovered case so we will definitely enter the "something changed"
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// state.
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var currentType = CharType.None;
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foreach (var c in password)
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{
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// First, identify what the current char is.
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CharType charType;
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if (char.IsLetter(c))
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{
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charType = CharType.Normal;
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}
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else if (char.IsDigit(c))
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{
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charType = CharType.Number;
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}
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else
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{
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charType = CharType.Special;
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}
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// If the char type changed, build a new span to append the text to.
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if (charType != currentType)
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{
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// Close off previous span.
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if (currentType != CharType.None)
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{
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result += "</span>";
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}
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currentType = charType;
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// Switch the color if it is not a normal text. Otherwise leave the
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// default value.
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switch (currentType)
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{
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// Apply color style to span.
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case CharType.Normal:
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result += normalColor;
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break;
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case CharType.Number:
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result += numberColor;
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break;
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case CharType.Special:
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result += specialColor;
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break;
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}
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}
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if (currentType == CharType.Special)
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{
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result += HttpUtility.HtmlEncode(c);
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}
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else
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{
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result += c;
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}
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// Add zero-width space after every char so per-char wrapping works consistently
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result += "​";
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}
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// Close off last span.
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if (currentType != CharType.None)
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{
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result += "</span>";
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}
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// Close off iOS div
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if (Device.RuntimePlatform == Device.iOS)
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{
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result += "</div>";
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}
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return result;
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}
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}
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}
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