Upload to Cloudinary with .Net SDK - Invalid Signature

[davesil2]

Bug report for Cloudinary .NET SDK

Before proceeding, please update to latest version and test if the issue persists

Describe the bug in a sentence or two.

When using the .NET SDK, it appears to not generate any signature. Additionally, my Cloudinary team requires metadata and the only way I can fulfill that requirement is with "addcustomparam" function.

Issue Type (Can be multiple)

• Build - Cannot install or import the SDK
• Performance - Performance issues
• [ X ] Behaviour - Functions are not working as expected (such as generate URL)
• [ X ] Documentation - Inconsistency between the docs and behaviour
• Other (Specify)

Steps to reproduce

Account account = new Account("","","");
Cloudinary cloudinary = new Cloudinary(account);
cloudinary.Api.SignatureAlgorithm = SignatureAlgorithm.SHA256;

var uploadParams = new ImageUploadParams()
{
File = new FileDescription("IMG_2019.jpeg",File.OpenRead(file)),
UploadPreset = "",
Folder = ""
};

uploadParams.AddCustomParam("category","artwork");

var uploadResult = cloudinary.Upload(uploadParams);
Console.WriteLine(uploadResult.JsonObj);

Error screenshots or Stack Trace (if applicable)

When attempting to upload the file, the response is always: ""message": "Invalid Signature 6832973aae19f7f322bb88d48c7b34731c390f04cb9fafd5353ea5e5178639ea. String to sign - 'folder=&timestamp=1768517629&upload_preset='.""

If I try to set the Metadata in the ImageUploadParams() as the documentation suggests, I get the error that you cannot convert a "X" to a bool. the key work Metadata does not hold the same meaning though the documentation indicates it does.

OS and Version

• Linux
• [ X ] Windows
• [ X ] macOS
• MultiPlatform

Versions and Libraries (fill in the version numbers)

• Cloudinary .NET SDK version - 1.27.9
• .NET Core - 9.0.304
• .NET Framework - n/a

Repository

I'm not sure on the repository. I can confirm that the same configuration works if I use the cloudinary-cli option.

If possible, please provide a link to a reproducible repository that showcases the problem

[const-cloudinary]

Hey @davesil2 , try removing empty parameters :

UploadPreset = "",
Folder = ""

[const-cloudinary]

@davesil2 here's an example of how to add Metadata on the upload:

CloudinaryDotNet/CloudinaryDotNet.IntegrationTests/UploadApi/UploadMethodsTest.cs

Line 1186 in 22c30fa

public void TestMetadata()

[davesil2]

thank you for your assistance...the documentation on the wloudinary website references the metadata object not metadata field and there were no details on using it. From the code reference I was able to deconstruct for my purposes...

https://cloudinary.com/documentation/upload_parameters#metadata - (Incorrect documentation reference)

var uploadParams = new ImageUploadParams()
{
File = new FileDescription(@"my_image.jpg"),
Tags = new List { "summer", "new-arrival" },
Context = new Dictionary<string, string>
{
{ "department", "apparel" },
{ "photographer", "Jane Doe" }
},
Metadata = new Dictionary<string, string>
{
{ "sku-id", "SKU12345678" },
{ "product-id", "PROD-9081-WHT" }
}
};

var uploadResult = cloudinary.Upload(uploadParams);

In order for the code to work, it would need to be updated to:

var uploadParams = new ImageUploadParams()
{
File = new FileDescription(@"my_image.jpg"),
Tags = new List { "summer", "new-arrival" },
Context = new Dictionary<string, string>
{
{ "department", "apparel" },
{ "photographer", "Jane Doe" }
},
MetadataFields = new StringDictionary
{
{ "sku-id", "SKU12345678" },
{ "product-id", "PROD-9081-WHT" }
}
};

[dejihastrup-cl]

Hi @davesil2, thanks for flagging this! I've raised this with our Docs team who will review and update the docs where necessary. I'll keep you posted for any updates.

[skalahasti-cloudinary]

Hi @davesil2

We changed the documentation to include MetadataFields accordingly. Can you please check the latest documentation at:
https://cloudinary.com/documentation/upload_parameters#metadata? and let us know if you have any questions. We have verified the fix.

Thanks,
Sree