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Zac 223 posts 575 karma points

Mar 11, 2015 @ 19:35
0

Implementing your own services

Feedback for ImageProcessor
Hi there,

Great tool. But can't figure out how to implement my own IImageService.

I simply want to have a custom images instead of a 404. So I create a new class CustomLocalFileImageService that implements IImageService.

I copy the source for LocalFileImageService and modify the GetImage method to return a different image if the file doesn't exist.

How do I actually set up ImageProcessor to use this? I have installed ImageProcessor.Config. I tried changing my security config to:
```
<security>
  <services>
    <service name="CustomLocalFileImageService" type="MyNamespace.CustomLocalFileImageService, MyNamespace" />
  </services>
</security>
```
Am I being thick? Also, if I want to deliver different 404 images depending on the path requested, is it just a case of doing an "if/then" in the GetImage or was the prefix attribute intended to be used for this? Apologies for not 'getting' it!
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James Jackson-South 489 posts 1747 karma points c-trib

Mar 11, 2015 @ 20:38

1

Hola,

Which version of ImageProcessor.Web are you using? If it's the package from here it's not up to date so probably won't have the functionality built in to do what you want. Nuget is always the best location.

In answer to your second question you would use if/else as the prefix setting is for identifying which service to use. That prefix is the start of the url you would use to get your image.

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Zac 223 posts 575 karma points

Mar 12, 2015 @ 22:58

0

Hi James,

Sorry, I should have specified - yes I'm working from nuget. I'm not actually using this in the umbraco context, I just figured this forum would be a good place to ask.

So, are you saying I've gotten the configuration right? I assume that if I only have one service (my custom one), the system will automatically use that for requests with image extensions then and that I don't need to use the prefix.

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James Jackson-South 489 posts 1747 karma points c-trib

Mar 13, 2015 @ 17:49

1

Yeah, that should be how it works. I'll have to double check though to be sure I haven't made a mistake somewhere.

If this is not Umbraco based I suggest we move this somewhere else. I have a gitter chatroom set up. https://gitter.im/JimBobSquarePants/ImageProcessor

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Zac 223 posts 575 karma points

Mar 17, 2015 @ 13:01
101
Seems to be working now. I was running the project using the development server rather than IIS - pretty sure that's what it was.

For future reference, to implement custom 404 images:
1. Install ImageProcessor, ImageProcessor.Web, ImageProcessor.Config
2. Copy the source for LocalFileImageService and give it your own name e.g. CustomLocalFileImageService and the correct namespace.
3. Modify the GetImage method as below.
4. Modify /config/security.config and use <service name="CustomLocalFileImageService" type="YourNamespace.CustomLocalFileImageService, YourNamespace" />
GetImage method:
```
if (!fileInfo.Exists)
{
    var pathLower = path.ToLower();
    if (path.ToLower().Contains("somepattern"))
        path = System.Web.Hosting.HostingEnvironment.MapPath("~/images/your-custom-image.jpg");
    else
        throw new HttpException(404, "No image exists at " + path);
}
```
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James Jackson-South 489 posts 1747 karma points c-trib

Mar 17, 2015 @ 20:17

0

I'm glad you got it working! :)

I wonder what was going wrong?

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Bjarne Fyrstenborg 1280 posts 3990 karma points MVP 7x c-trib

Nov 09, 2017 @ 10:15

In newer versions of ImageProcessor GetImage is allowed to override. https://github.com/JimBobSquarePants/ImageProcessor/commit/b453b38c501d3a69cdfe6c30c36903e2d1e45472#diff-c4f527cd14023f61321629ab67a30185

However I couldn't make it work although path is replaced with new value.

public class CustomLocalFileImageService : LocalFileImageService
{
    /// <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 override async Task<byte[]> GetImage(object id)
    {
        string path = id.ToString();
        byte[] buffer;

        // Check to see if the file exists.
        if (!File.Exists(path))
        {
            if (path.ToLower().Contains("\\img\\products\\"))
                path = System.Web.Hosting.HostingEnvironment.MapPath("~/dist/img/no-product-image.jpg");
            else
                throw new HttpException((int)HttpStatusCode.NotFound, "No image exists at " + path);

            throw new HttpException((int)HttpStatusCode.NotFound, "No image exists at " + path);
        }

        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;
    }
}

The class is wrapped inside a namespace My.Library.ImageProcessor and in config/imageprocessor/security.config I have the following:

<service name="CustomLocalFileImageService" type="My.Library.ImageProcessor.CustomLocalFileImageService, My.Library" />

Am I missing something?

/Bjarne

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Bjarne Fyrstenborg 1280 posts 3990 karma points MVP 7x c-trib

Nov 09, 2017 @ 10:52

0

Okay, now it is working :)

No sure if ImageProcessor just had the old request cached even I had recycled the application and cleared brower cache.

But now I get the no-product-image.jpg it the psychical file e.g. /img/products/123456.jpg doesn't exists.

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Bjarne Fyrstenborg 1280 posts 3990 karma points MVP 7x c-trib

Nov 09, 2017 @ 11:04

The issue seems to be because of the last line here:

throw new HttpException((int)HttpStatusCode.NotFound, "No image exists at " + path);

I have changed this part to:

// Check to see if the file exists.
if (!File.Exists(path))
{
    if (path.ToLower().Contains("\\img\\products\\"))
    {
        path = System.Web.Hosting.HostingEnvironment.MapPath("~/dist/img/no-product-image.jpg");

        if(!File.Exists(path))
            throw new HttpException((int)HttpStatusCode.NotFound, "No image exists at " + path);
    }
    else
    {
        throw new HttpException((int)HttpStatusCode.NotFound, "No image exists at " + path);
    }
}

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