Add yaml support

[carlin-q-scott]

I'd like to be able to store application/yaml content in my app config keys and have this library deserialize it.

I found the json key value adaptor in src/Microsoft.Extensions.Configuration.AzureAppConfiguration/JsonKeyValueAdapter.cs. I don't think it would take much work to implement that for yaml. But it would add a dependency on another nuget package.

[amerjusupovic]

Hi @carlin-q-scott , as of now we recommend using the application/json content type and converting yaml data to json format when necessary. Please let us know if you have any questions or issues you feel aren't addressed by this approach.

[goldsam]

The issue is having to convert back and forth between JSON and YAML. azure App Configuration is targeting administrators who enjoy simplicity. YAML is simplicity - there's a reason it's achieved nearly ubiquitous adoption. Sorry to sound snarky, but I feel like this was self-evident in the OP's request and the response seemed very dismissive.

[amerjusupovic]

I never intended to be dismissive of the original question, so I'm sorry if I came across that way. From what I understand, yaml can be converted to json fairly easily so I thought it wouldn't introduce a large hurdle for anyone who wants to parse a yaml file. I wanted to know if anyone's aware of an issue with this, or a use case that I might not have considered, because then I would appreciate them bringing up any issues with my original understanding.

I agree that having YAML parsing could make things a bit easier for some users. The nuget package for parsing yaml that was mentioned does mean we have to add a new dependency, which we usually try to avoid. We didn't think there was a strong enough reason to add this capability, so we recommended the approach that I mentioned. We're of course open to reconsidering this if it's something that people feel strongly about.

[goldsam]

@amerjusupovic You could instead make IKeyValueAdapter a part of the public API to allow parsing extensions. A separate package such as Microsoft.Extensions.Configuration.AzureAppConfiguration.Yaml could be provided to add the request YAML support.