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Tidy up image resizing example

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This commit is contained in:
SteveSandersonMS
2016-06-07 17:46:42 +01:00
parent e58a4e4015
commit 7af64a8944
2 changed files with 18 additions and 15 deletions
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30
samples/misc/NodeServicesExamples/Controllers/ResizeImage.cs
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@@ -11,6 +11,7 @@ namespace NodeServicesExamples.Controllers
public class ResizeImageController : Controller
{
private const int MaxDimension = 1000;
private static string[] AllowedMimeTypes = new[] { "image/jpeg", "image/png", "image/gif" };
private IHostingEnvironment _environment;
private INodeServices _nodeServices;
@@ -25,11 +26,18 @@ namespace NodeServicesExamples.Controllers
public async Task<IActionResult> Index(string imagePath, int maxWidth, int maxHeight)
{
// Validate incoming params
if (maxWidth > MaxDimension || maxHeight > MaxDimension || (maxHeight <= 0 && maxWidth <= 0))
if (maxWidth < 0 || maxHeight < 0 || maxWidth > MaxDimension || maxHeight > MaxDimension
|| (maxWidth + maxHeight) == 0)
{
return BadRequest("Invalid dimensions");
}
var mimeType = GetContentType(imagePath);
if (Array.IndexOf(AllowedMimeTypes, mimeType) < 0)
{
return BadRequest("Disallowed image format");
}
// Locate source image on disk
var fileInfo = _environment.WebRootFileProvider.GetFileInfo(imagePath);
if (!fileInfo.Exists)
@@ -38,25 +46,19 @@ namespace NodeServicesExamples.Controllers
}
// Invoke Node and pipe the result to the response
var mimeType = GetContentType(imagePath);
var imageStream = await _nodeServices.Invoke<Stream>("./Node/resizeImage", fileInfo.PhysicalPath, mimeType, maxWidth, maxHeight);
var imageStream = await _nodeServices.Invoke<Stream>(
"./Node/resizeImage",
fileInfo.PhysicalPath,
mimeType,
maxWidth,
maxHeight);
return File(imageStream, mimeType);
}
private string GetContentType(string path)
{
string result;
if (!new FileExtensionContentTypeProvider().TryGetContentType(path, out result))
{
result = "application/octet-stream";
}
return result;
}
private class ResizeImageResult
{
public string Base64 { get; set; }
return new FileExtensionContentTypeProvider().TryGetContentType(path, out result) ? result : null;
}
}
}

3
samples/misc/NodeServicesExamples/Node/resizeImage.js
View File

@@ -1,7 +1,8 @@
var sharp = require('sharp');
module.exports = function(result, physicalPath, mimeType, maxWidth, maxHeight) {
// Invoke the 'sharp' NPM module, and have it pipe the resulting image data back to .NET
sharp(physicalPath)
.resize(maxWidth > 0 ? maxWidth : null, maxHeight > 0 ? maxHeight : null)
.resize(maxWidth || null, maxHeight || null)
.pipe(result.stream);
}