C9S.Extensions.Configuration

Usage

---

This

{
    "General":
    {
        "HttpListenPort": "3000",
        "HttpsListenPort": "3001",
        "WebUrl": "https://localhost:{{General.HttpsListenPort}}"
    },
    "Pages":
    {
        "AuthorizeAddress": "{{General.WebUrl}}/api/beta/authorize",
        "DashboardAddress": "{{General.WebUrl}}/dashboard"
    }
}

Becomes

{
    "General":
    {
        "HttpsListenPort": "3001",
        "WebUrl": "https://localhost:3001"
    },
    "Pages":
    {
        "AuthorizeAddress": "https://localhost:3001/api/beta/authorize",
        "DashboardAddress": "https://localhost:3001/dashboard"
    }
}

After running

Startup.cs

public void ConfigureServices(IServiceCollection services)
{
    ...

    Configuration.ResolveVariables();

    ...
}

ResolveVariables will take any variable path and resolve it. It even works across .json files. As long as the data is stored inside the ConfigurationRoot, it is resolvable

Variable Identification

In the ResolveVariables function you can declare what a variable is (default {{variable}}).

Example:

Startup.cs

public void ConfigureServices(IServiceCollection services)
{
    ...

    Configuration.ResolveVariables("${", "}");

    ...
}

appsettitngs.json

{
    "General":
    {
        "HttpListenPort": "3000",
        "HttpsListenPort": "3001",
        "WebUrl": "https://localhost:${General.HttpsListenPort}"
    },
    "Pages":
    {
        "AuthorizeAddress": "${General.WebUrl}/api/beta/authorize",
        "DashboardAddress": "${General.WebUrl}/dashboard"
    }
}

Now anything inside the ${variable} is considered a variable.

Nested variables (variables inside variables)

If the need arises you can also resolve variables within other variables

Example:

Assuming ASPNETCORE_ENVIRONMENT = Development

appsettings.json

{
    "App":
    {
        "Development": {
            "ClientId": "FooId"
        }
    },
    "Auth":
    {
        "ClientID": "${App.${ASPNETCORE_ENVIRONMENT}.ClientId}"
    }
}

Will become

{
    "App":
    {
        "Development": {
            "ClientId": "FooId"
        }
    },
    "Auth":
    {
        "ClientID": "${App.Development.ClientId}"
    }
}

Which will resolve to

{
    "App":
    {
        "Development": {
            "ClientId": "FooId"
        }
    },
    "Auth":
    {
        "ClientID": "FooId"
    }
}