|
|
|
|
@ -0,0 +1,210 @@
|
|
|
|
|
using System;
|
|
|
|
|
using System.ComponentModel;
|
|
|
|
|
using System.Linq;
|
|
|
|
|
using System.Security.Cryptography;
|
|
|
|
|
using System.Text;
|
|
|
|
|
using Microsoft.AspNetCore.Http;
|
|
|
|
|
using Microsoft.AspNetCore.Razor.TagHelpers;
|
|
|
|
|
|
|
|
|
|
namespace Volo.Blogging.Areas.Blog.Helpers.TagHelpers
|
|
|
|
|
{
|
|
|
|
|
/// <inheritdoc />
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Returns a Globally Recognised Avatar https://en.gravatar.com
|
|
|
|
|
/// </summary>
|
|
|
|
|
[HtmlTargetElement("img", Attributes = "gravatar-email")]
|
|
|
|
|
public class GravatarTagHelper : TagHelper
|
|
|
|
|
{
|
|
|
|
|
private readonly IHttpContextAccessor _contextAccessor;
|
|
|
|
|
|
|
|
|
|
public GravatarTagHelper(IHttpContextAccessor contextAccessor)
|
|
|
|
|
{
|
|
|
|
|
_contextAccessor = contextAccessor;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Email Address for the Gravatar
|
|
|
|
|
/// </summary>
|
|
|
|
|
[HtmlAttributeName("gravatar-email")]
|
|
|
|
|
public string Email { get; set; }
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Gravatar content rating (note that Gravatars are self-rated)
|
|
|
|
|
/// </summary>
|
|
|
|
|
[HtmlAttributeName("gravatar-rating")]
|
|
|
|
|
public GravatarRating Rating { get; set; } = GravatarRating.GeneralAudiences;
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Size in pixels (default: 80)
|
|
|
|
|
/// </summary>
|
|
|
|
|
[HtmlAttributeName("gravatar-size")]
|
|
|
|
|
public int Size { get; set; } = 80;
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// URL to a custom default image (e.g: 'Url.Content("~/images/no-grvatar.png")' )
|
|
|
|
|
/// </summary>
|
|
|
|
|
[HtmlAttributeName("default-image-url")]
|
|
|
|
|
public string DefaultImageUrl { get; set; } = "";
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Prefer the default image over the users own Gravatar
|
|
|
|
|
/// </summary>
|
|
|
|
|
[HtmlAttributeName("force-default-image")]
|
|
|
|
|
public bool ForceDefaultImage { get; set; }
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Default image if user hasn't created a Gravatar
|
|
|
|
|
/// </summary>
|
|
|
|
|
[HtmlAttributeName("default-image")]
|
|
|
|
|
public GravatarDefaultImage DefaultImage { get; set; } = GravatarDefaultImage.Default;
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Always do secure (https) requests
|
|
|
|
|
/// </summary>
|
|
|
|
|
[HtmlAttributeName("force-secure-request")]
|
|
|
|
|
public bool ForceSecureRequest { get; set; } = true;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
public override void Process(TagHelperContext context, TagHelperOutput output)
|
|
|
|
|
{
|
|
|
|
|
var emailAddress = Email == null ? string.Empty : Email.Trim().ToLower();
|
|
|
|
|
|
|
|
|
|
var url = string.Format("{0}://{1}.gravatar.com/avatar/{2}?s={3}{4}{5}{6}",
|
|
|
|
|
GetUrlScheme(),
|
|
|
|
|
GetUrlPrefix(),
|
|
|
|
|
GetMd5Hash(emailAddress),
|
|
|
|
|
Size,
|
|
|
|
|
GetDefaultImageParameter(),
|
|
|
|
|
GetForceDefaultImageParameter(),
|
|
|
|
|
GetRatingParameter()
|
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
output.Attributes.SetAttribute("src", url);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private string GetUrlScheme()
|
|
|
|
|
{
|
|
|
|
|
return ForceSecureRequest || _contextAccessor.HttpContext.Request.IsHttps
|
|
|
|
|
? "https" : "http";
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private string GetUrlPrefix()
|
|
|
|
|
{
|
|
|
|
|
return ForceSecureRequest || _contextAccessor.HttpContext.Request.IsHttps ? "secure" : "www";
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private string GetDefaultImageParameter()
|
|
|
|
|
{
|
|
|
|
|
return "&d=" + (!string.IsNullOrEmpty(DefaultImageUrl)
|
|
|
|
|
? System.Net.WebUtility.UrlEncode(DefaultImageUrl)
|
|
|
|
|
: GetEnumDescription(DefaultImage));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private string GetForceDefaultImageParameter()
|
|
|
|
|
{
|
|
|
|
|
return ForceDefaultImage ? "&f=y" : "";
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private string GetRatingParameter()
|
|
|
|
|
{
|
|
|
|
|
return "&r=" + GetEnumDescription(Rating);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Generates an MD5 hash of the given string
|
|
|
|
|
/// </summary>
|
|
|
|
|
/// <remarks>Source: http://msdn.microsoft.com/en-us/library/system.security.cryptography.md5.aspx </remarks>
|
|
|
|
|
private static string GetMd5Hash(string input)
|
|
|
|
|
{
|
|
|
|
|
// Convert the input string to a byte array and compute the hash.
|
|
|
|
|
var data = MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(input));
|
|
|
|
|
|
|
|
|
|
// Create a new Stringbuilder to collect the bytes
|
|
|
|
|
// and create a string.
|
|
|
|
|
var sBuilder = new StringBuilder();
|
|
|
|
|
|
|
|
|
|
// Loop through each byte of the hashed data
|
|
|
|
|
// and format each one as a hexadecimal string.
|
|
|
|
|
foreach (var t in data)
|
|
|
|
|
{
|
|
|
|
|
sBuilder.Append(t.ToString("x2"));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Return the hexadecimal string.
|
|
|
|
|
return sBuilder.ToString();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Returns the value of a Description for a given Enum value
|
|
|
|
|
/// </summary>
|
|
|
|
|
/// <remarks>Source: http://blogs.msdn.com/b/abhinaba/archive/2005/10/21/483337.aspx </remarks>
|
|
|
|
|
/// <param name="en"></param>
|
|
|
|
|
/// <returns></returns>
|
|
|
|
|
private static string GetEnumDescription(Enum en)
|
|
|
|
|
{
|
|
|
|
|
var type = en.GetType();
|
|
|
|
|
var memInfo = type.GetMember(en.ToString());
|
|
|
|
|
|
|
|
|
|
if (memInfo == null || memInfo.Length <= 0)
|
|
|
|
|
{
|
|
|
|
|
return en.ToString();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
var attrs = memInfo[0].GetCustomAttributes(typeof(DescriptionAttribute), false);
|
|
|
|
|
|
|
|
|
|
if (attrs != null && attrs.Any())
|
|
|
|
|
{
|
|
|
|
|
return ((DescriptionAttribute)attrs.First()).Description;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return en.ToString();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public enum GravatarDefaultImage
|
|
|
|
|
{
|
|
|
|
|
/// <summary>Default Gravatar logo</summary>
|
|
|
|
|
[Description("")]
|
|
|
|
|
Default,
|
|
|
|
|
/// <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>
|
|
|
|
|
[Description("404")]
|
|
|
|
|
Http404,
|
|
|
|
|
/// <summary>Mystery-Man - a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)</summary>
|
|
|
|
|
[Description("mm")]
|
|
|
|
|
MysteryMan,
|
|
|
|
|
/// <summary>Identicon - a geometric pattern based on an email hash</summary>
|
|
|
|
|
[Description("identicon")]
|
|
|
|
|
Identicon,
|
|
|
|
|
/// <summary>MonsterId - a generated 'monster' with different colors, faces, etc</summary>
|
|
|
|
|
[Description("monsterid")]
|
|
|
|
|
MonsterId,
|
|
|
|
|
/// <summary>Wavatar - generated faces with differing features and backgrounds</summary>
|
|
|
|
|
[Description("wavatar")]
|
|
|
|
|
Wavatar,
|
|
|
|
|
/// <summary>Retro - awesome generated, 8-bit arcade-style pixelated faces</summary>
|
|
|
|
|
[Description("retro")]
|
|
|
|
|
Retro
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// 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
|
|
|
|
|
/// </summary>
|
|
|
|
|
public enum GravatarRating
|
|
|
|
|
{
|
|
|
|
|
/// <summary>Suitable for display on all websites with any audience type</summary>
|
|
|
|
|
[Description("g")]
|
|
|
|
|
GeneralAudiences,
|
|
|
|
|
|
|
|
|
|
/// <summary>May contain rude gestures, provocatively dressed individuals, the lesser swear words, or mild violence</summary>
|
|
|
|
|
[Description("pg")]
|
|
|
|
|
ParentalGuidance,
|
|
|
|
|
|
|
|
|
|
/// <summary>May contain such things as harsh profanity, intense violence, nudity, or hard drug use</summary>
|
|
|
|
|
[Description("r")]
|
|
|
|
|
Restricted,
|
|
|
|
|
|
|
|
|
|
/// <summary>May contain hardcore sexual imagery or extremely disturbing violence</summary>
|
|
|
|
|
[Description("x")]
|
|
|
|
|
OnlyMature
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
Yunus Emre Kalkan
7 years ago