/// <summary>
/// Renders the requested identicon and returns it to the client.
/// </summary>
/// <param name="context"><see cref="HttpContext"/> with the current request and response.</param>
public void ProcessRequest(HttpContext context)
{
if (IdenticonRequest.TryParse(context.Request.Url.Query, out var request))
{
// The urls are permanent so it is ok to cache icons for a long time
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetMaxAge(TimeSpan.FromDays(30));
var icon = Identicon.FromHash(request.Hash, request.Size);
icon.Style = request.Style;
switch (request.Format)
{
case ExportImageFormat.Png:
context.Response.ContentType = "image/png";
icon.SaveAsPng(context.Response.OutputStream);
break;
case ExportImageFormat.Svg:
context.Response.ContentType = "image/svg+xml";
icon.SaveAsSvg(context.Response.OutputStream);
break;
default:
throw new NotSupportedException($"The image format '{request.Format}' is not supported by {nameof(IdenticonHttpHandler)}.");
}
}
else
{
throw new HttpException(404, "Icon not found");
}
}
public static string Create(HttpResponseBase response, byte[] hash, int size, ExportImageFormat format, IdenticonStyle style)
{
var parameters = new IdenticonRequest
{
Hash = hash,
Size = size,
Style = style,
Format = format
};
// Percent-encoding not needed as IdenticonRequest generates query string safe strings.
return(response.ApplyAppPathModifier($"~/identicon.axd?{parameters}"));
}
public static string Create(HttpContext context, byte[] hash, int size, ExportImageFormat format, IdenticonStyle style)
{
IdenticonMiddleware.EnsureConstructed();
var parameters = new IdenticonRequest
{
Hash = hash,
Size = size,
Style = style,
Format = format
};
// Percent-encoding not needed as IdenticonRequest generates query string safe strings.
return(context.Request.PathBase.Add(PathPrefix + "/" + parameters).Value);
}
/// <summary>
/// Processes a request and determines whether it can be handled as an identicon request.
/// </summary>
/// <param name="context">Current context.</param>
public Task InvokeAsync(HttpContext context)
{
var path = context.Request.Path;
if (path.HasValue)
{
var requestString = context.Request.Path.Value.Trim('/');
if (IdenticonRequest.TryParse(requestString, out var request))
{
return(HandleRequestAsync(context, request));
}
}
return(next(context));
}
public void IdenticonRequest_Extended()
{
var url1 = new IdenticonRequest
{
Hash = HashGenerator.ComputeHash("Hello", "SHA1"),
Size = 741,
Style = new IdenticonStyle
{
Padding = 0.3f,
BackColor = Color.Bisque,
ColorLightness = Range.Create(0.25f, 0.75f),
GrayscaleLightness = Range.Create(0, 1f),
ColorSaturation = 0.4f,
GrayscaleSaturation = 0.1f,
Hues = new HueCollection {
1.5f, -0.25f, 0.8f
}
}
};
var text = url1.ToString();
Assert.IsTrue(IdenticonRequest.TryParse(text, out var url2));
Assert.AreEqual(url1.Format, url2.Format);
Assert.AreEqual(url1.Style.BackColor.ToRgba(), url2.Style.BackColor.ToRgba());
AssertAreAlmostEqual(url1.Style.Padding, url2.Style.Padding);
AssertAreAlmostEqual(url1.Style.ColorLightness.From, url2.Style.ColorLightness.From);
AssertAreAlmostEqual(url1.Style.ColorLightness.To, url2.Style.ColorLightness.To);
AssertAreAlmostEqual(url1.Style.GrayscaleLightness.From, url2.Style.GrayscaleLightness.From);
AssertAreAlmostEqual(url1.Style.GrayscaleLightness.To, url2.Style.GrayscaleLightness.To);
#pragma warning disable 0618
AssertAreAlmostEqual(url1.Style.ColorSaturation, url2.Style.Saturation);
#pragma warning restore 0618
AssertAreAlmostEqual(url1.Style.ColorSaturation, url2.Style.ColorSaturation);
AssertAreAlmostEqual(url1.Style.GrayscaleSaturation, url2.Style.GrayscaleSaturation);
Assert.AreEqual(3, url2.Style.Hues.Count);
AssertAreAlmostEqual(0.5f, url2.Style.Hues[0]);
AssertAreAlmostEqual(0.75f, url2.Style.Hues[1]);
AssertAreAlmostEqual(0.8f, url2.Style.Hues[2]);
Assert.AreEqual(url1.Size, url2.Size);
}
private async Task HandleRequestAsync(HttpContext context, IdenticonRequest request)
{
var icon = Identicon.FromHash(request.Hash, request.Size);
icon.Style = request.Style;
var headers = context.Response.GetTypedHeaders();
Stream data;
string contentType;
switch (request.Format)
{
case ExportImageFormat.Svg:
data = icon.SaveAsSvg();
contentType = "image/svg+xml";
break;
default:
data = icon.SaveAsPng();
contentType = "image/png";
break;
}
try
{
context.Response.ContentType = contentType;
context.Response.ContentLength = data.Length;
// The urls are permanent so it is ok to cache icons for a long time
headers.CacheControl =
new CacheControlHeaderValue
{
Public = true,
MaxAge = TimeSpan.FromDays(30)
};
await data.CopyToAsync(context.Response.Body);
}
finally
{
data?.Dispose();
}
}
public Task InvokeAsync(HttpContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var path = context.Request.Path;
if (path.HasValue)
{
var requestString = context.Request.Path.Value.Trim('/');
if (IdenticonRequest.TryParse(requestString, out var request))
{
return(HandleRequestAsync(context, request));
}
}
return(next(context));
}
public void IdenticonRequest_Compact_SizeMultipleOf5()
{
var url1 = new IdenticonRequest
{
Hash = HashGenerator.ComputeHash("Hello", "SHA1"),
Size = 65
};
var text = url1.ToString();
Assert.IsTrue(IdenticonRequest.TryParse(text, out var url2));
Assert.AreEqual(url1.Format, url2.Format);
Assert.AreEqual(url1.Style.BackColor.ToRgba(), url2.Style.BackColor.ToRgba());
AssertAreAlmostEqual(url1.Style.Padding, url2.Style.Padding);
AssertAreAlmostEqual(url1.Style.ColorLightness.From, url2.Style.ColorLightness.From);
AssertAreAlmostEqual(url1.Style.ColorLightness.To, url2.Style.ColorLightness.To);
AssertAreAlmostEqual(url1.Style.GrayscaleLightness.From, url2.Style.GrayscaleLightness.From);
AssertAreAlmostEqual(url1.Style.GrayscaleLightness.To, url2.Style.GrayscaleLightness.To);
Assert.AreEqual(url1.Size, url2.Size);
}
public void IdenticonRequest_DefaultStyle()
{
var url1 = new IdenticonRequest
{
Hash = HashGenerator.ComputeHash("Hello", "SHA1"),
Size = 741,
Style = new IdenticonStyle
{
Padding = 0.3f
}
};
try
{
var text = url1.ToString();
Assert.IsTrue(IdenticonRequest.TryParse(text, out var url2));
AssertAreAlmostEqual(0.3f, url2.Style.Padding);
Identicon.DefaultStyle.Padding = 0.1f;
AssertAreAlmostEqual(0.3f, url2.Style.Padding);
Identicon.DefaultStyle.Padding = 0.3f;
text = url1.ToString();
Assert.IsTrue(IdenticonRequest.TryParse(text, out var url3));
AssertAreAlmostEqual(0.3f, url3.Style.Padding);
Identicon.DefaultStyle.Padding = 0.2f;
Assert.IsTrue(IdenticonRequest.TryParse(text, out var url4));
AssertAreAlmostEqual(0.2f, url4.Style.Padding);
}
finally
{
// Restore default style so that other tests are not affected
Identicon.DefaultStyle = null;
}
}
