mirror of https://github.com/abpframework/abp.git
Yunus Emre Kalkan
7 years ago
6 changed files with 221 additions and 18 deletions
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using System; |
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using System.ComponentModel; |
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using System.Linq; |
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using System.Security.Cryptography; |
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using System.Text; |
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using Microsoft.AspNetCore.Http; |
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using Microsoft.AspNetCore.Razor.TagHelpers; |
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namespace Volo.Blogging.Areas.Blog.Helpers.TagHelpers |
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{ |
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/// <inheritdoc />
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/// <summary>
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/// Returns a Globally Recognised Avatar https://en.gravatar.com
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/// </summary>
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[HtmlTargetElement("img", Attributes = "gravatar-email")] |
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public class GravatarTagHelper : TagHelper |
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{ |
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private readonly IHttpContextAccessor _contextAccessor; |
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public GravatarTagHelper(IHttpContextAccessor contextAccessor) |
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{ |
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_contextAccessor = contextAccessor; |
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} |
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/// <summary>
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/// Email Address for the Gravatar
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/// </summary>
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[HtmlAttributeName("gravatar-email")] |
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public string Email { get; set; } |
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/// <summary>
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/// Gravatar content rating (note that Gravatars are self-rated)
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/// </summary>
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[HtmlAttributeName("gravatar-rating")] |
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public GravatarRating Rating { get; set; } = GravatarRating.GeneralAudiences; |
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/// <summary>
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/// Size in pixels (default: 80)
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/// </summary>
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[HtmlAttributeName("gravatar-size")] |
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public int Size { get; set; } = 80; |
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/// <summary>
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/// URL to a custom default image (e.g: 'Url.Content("~/images/no-grvatar.png")' )
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/// </summary>
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[HtmlAttributeName("default-image-url")] |
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public string DefaultImageUrl { get; set; } = ""; |
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/// <summary>
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/// Prefer the default image over the users own Gravatar
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/// </summary>
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[HtmlAttributeName("force-default-image")] |
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public bool ForceDefaultImage { get; set; } |
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/// <summary>
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/// Default image if user hasn't created a Gravatar
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/// </summary>
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[HtmlAttributeName("default-image")] |
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public GravatarDefaultImage DefaultImage { get; set; } = GravatarDefaultImage.Default; |
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/// <summary>
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/// Always do secure (https) requests
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/// </summary>
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[HtmlAttributeName("force-secure-request")] |
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public bool ForceSecureRequest { get; set; } = true; |
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public override void Process(TagHelperContext context, TagHelperOutput output) |
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{ |
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var emailAddress = Email == null ? string.Empty : Email.Trim().ToLower(); |
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var url = string.Format("{0}://{1}.gravatar.com/avatar/{2}?s={3}{4}{5}{6}", |
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GetUrlScheme(), |
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GetUrlPrefix(), |
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GetMd5Hash(emailAddress), |
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Size, |
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GetDefaultImageParameter(), |
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GetForceDefaultImageParameter(), |
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GetRatingParameter() |
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); |
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output.Attributes.SetAttribute("src", url); |
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} |
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private string GetUrlScheme() |
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{ |
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return ForceSecureRequest || _contextAccessor.HttpContext.Request.IsHttps |
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? "https" : "http"; |
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} |
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private string GetUrlPrefix() |
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{ |
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return ForceSecureRequest || _contextAccessor.HttpContext.Request.IsHttps ? "secure" : "www"; |
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} |
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private string GetDefaultImageParameter() |
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{ |
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return "&d=" + (!string.IsNullOrEmpty(DefaultImageUrl) |
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? System.Net.WebUtility.UrlEncode(DefaultImageUrl) |
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: GetEnumDescription(DefaultImage)); |
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} |
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private string GetForceDefaultImageParameter() |
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{ |
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return ForceDefaultImage ? "&f=y" : ""; |
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} |
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private string GetRatingParameter() |
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{ |
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return "&r=" + GetEnumDescription(Rating); |
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} |
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/// <summary>
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/// Generates an MD5 hash of the given string
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/// </summary>
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/// <remarks>Source: http://msdn.microsoft.com/en-us/library/system.security.cryptography.md5.aspx </remarks>
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private static string GetMd5Hash(string input) |
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{ |
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// Convert the input string to a byte array and compute the hash.
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var data = MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(input)); |
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// Create a new Stringbuilder to collect the bytes
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// and create a string.
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var sBuilder = new StringBuilder(); |
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// Loop through each byte of the hashed data
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// and format each one as a hexadecimal string.
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foreach (var t in data) |
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{ |
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sBuilder.Append(t.ToString("x2")); |
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} |
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// Return the hexadecimal string.
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return sBuilder.ToString(); |
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} |
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/// <summary>
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/// Returns the value of a Description for a given Enum value
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/// </summary>
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/// <remarks>Source: http://blogs.msdn.com/b/abhinaba/archive/2005/10/21/483337.aspx </remarks>
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/// <param name="en"></param>
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/// <returns></returns>
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private static string GetEnumDescription(Enum en) |
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{ |
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var type = en.GetType(); |
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var memInfo = type.GetMember(en.ToString()); |
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if (memInfo == null || memInfo.Length <= 0) |
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{ |
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return en.ToString(); |
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} |
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var attrs = memInfo[0].GetCustomAttributes(typeof(DescriptionAttribute), false); |
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if (attrs != null && attrs.Any()) |
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{ |
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return ((DescriptionAttribute)attrs.First()).Description; |
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} |
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return en.ToString(); |
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} |
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public enum GravatarDefaultImage |
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{ |
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/// <summary>Default Gravatar logo</summary>
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[Description("")] |
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Default, |
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/// <summary>404 - do not load any image if none is associated with the email hash, instead return an HTTP 404 (File Not Found) response</summary>
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[Description("404")] |
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Http404, |
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/// <summary>Mystery-Man - a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)</summary>
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[Description("mm")] |
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MysteryMan, |
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/// <summary>Identicon - a geometric pattern based on an email hash</summary>
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[Description("identicon")] |
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Identicon, |
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/// <summary>MonsterId - a generated 'monster' with different colors, faces, etc</summary>
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[Description("monsterid")] |
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MonsterId, |
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/// <summary>Wavatar - generated faces with differing features and backgrounds</summary>
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[Description("wavatar")] |
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Wavatar, |
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/// <summary>Retro - awesome generated, 8-bit arcade-style pixelated faces</summary>
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[Description("retro")] |
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Retro |
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} |
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/// <summary>
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/// Gravatar allows users to self-rate their images so that they can indicate if an image is appropriate for a certain audience. By default, only 'G' rated images are displayed unless you indicate that you would like to see higher ratings
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/// </summary>
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public enum GravatarRating |
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{ |
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/// <summary>Suitable for display on all websites with any audience type</summary>
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[Description("g")] |
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GeneralAudiences, |
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/// <summary>May contain rude gestures, provocatively dressed individuals, the lesser swear words, or mild violence</summary>
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[Description("pg")] |
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ParentalGuidance, |
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/// <summary>May contain such things as harsh profanity, intense violence, nudity, or hard drug use</summary>
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[Description("r")] |
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Restricted, |
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/// <summary>May contain hardcore sexual imagery or extremely disturbing violence</summary>
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[Description("x")] |
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OnlyMature |
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} |
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} |
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} |
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@ -1,3 +1,4 @@ |
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@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers |
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@addTagHelper *, Volo.Abp.AspNetCore.Mvc.UI |
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@addTagHelper *, Volo.Abp.AspNetCore.Mvc.UI.Bootstrap |
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@addTagHelper *, Volo.Blogging.Web |
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