Created
November 18, 2014 21:20
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Example IImageService implementation
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using System; | |
using System.Collections.Generic; | |
using System.IO; | |
using System.Threading.Tasks; | |
using System.Web; | |
using System.Web.Hosting; | |
using ImageProcessor.Web.Services; | |
/// <summary> | |
/// The test image service. | |
/// </summary> | |
public class TestImageService : IImageService | |
{ | |
/// <summary> | |
/// The prefix for the given implementation. | |
/// </summary> | |
private string prefix = "testprovider.axd"; | |
/// <summary> | |
/// Gets or sets the prefix for the given implementation. | |
/// <remarks> | |
/// This value is used as a prefix for any image requests that should use this service. | |
/// </remarks> | |
/// </summary> | |
public string Prefix | |
{ | |
get | |
{ | |
return this.prefix; | |
} | |
set | |
{ | |
this.prefix = value; | |
} | |
} | |
/// <summary> | |
/// Gets a value indicating whether the image service requests files from | |
/// the locally based file system. | |
/// </summary> | |
public bool IsFileLocalService | |
{ | |
get | |
{ | |
return true; | |
} | |
} | |
/// <summary> | |
/// Gets or sets any additional settings required by the service. | |
/// </summary> | |
public Dictionary<string, string> Settings { get; set; } | |
/// <summary> | |
/// Gets or sets the white list of <see cref="System.Uri"/>. | |
/// </summary> | |
public Uri[] WhiteList { get; set; } | |
/// <summary> | |
/// Gets a value indicating whether the current request passes sanitizing rules. | |
/// </summary> | |
/// <param name="path"> | |
/// The image path. | |
/// </param> | |
/// <returns> | |
/// <c>True</c> if the request is valid; otherwise, <c>False</c>. | |
/// </returns> | |
public bool IsValidRequest(string path) | |
{ | |
return true; | |
} | |
/// <summary> | |
/// Gets the image using the given identifier. | |
/// </summary> | |
/// <param name="id"> | |
/// The value identifying the image to fetch. | |
/// </param> | |
/// <returns> | |
/// The <see cref="System.Byte"/> array containing the image data. | |
/// </returns> | |
public async Task<byte[]> GetImage(object id) | |
{ | |
const string AppData = "~/App_Data/images"; | |
string imageRoot = HostingEnvironment.MapPath(AppData); | |
if (imageRoot == null) | |
{ | |
throw new HttpException(404, "No root path found to serve " + id); | |
} | |
// In this instance we are just processing a set path. | |
// If you are using the querystring params as a means of identifying the correct image | |
// then you can do something with it here. | |
string path = Path.Combine(imageRoot, id.ToString().Split(new[] { '&', '?' })[0]); | |
byte[] buffer; | |
// Check to see if the file exists. | |
// ReSharper disable once AssignNullToNotNullAttribute | |
FileInfo fileInfo = new FileInfo(path); | |
if (!fileInfo.Exists) | |
{ | |
throw new HttpException(404, "Nothing found at " + id); | |
} | |
using (FileStream file = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, true)) | |
{ | |
buffer = new byte[file.Length]; | |
await file.ReadAsync(buffer, 0, (int)file.Length); | |
} | |
return buffer; | |
} | |
} |
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Example working urls.
/testprovider.axd?new-york.jpg?width=300
/testprovider.axd?new-york.jpg?p=1?width=300
/testprovider.axd?new-york.jpg?p=1&form=1234?width=300