Reading variables from app settings another time in Azure Function App

Question

I have a function app, the app settings has several different PATs One of the function is an HTTP trigger, the request body will contain a specific name and that name should be used to retrieve the corresponding PAT from app settings

I have tried Environment.GetEnvironmentVariable, this doesnt seem to read from app settings at all

I have tried

var configuration = builder.GetContext().Configuration;
var pat = configuration[$"{name}_PAT"];

this was a struggle because the {name} is only available after the POST request comes in, and configuration read the app settings in startup.cs, which is before the function getting triggered

I also cant use configuration after the request had come in because of the {name} and public abstract void Configure(IFunctionsHostBuilder builder) from FunctionsStartup doesn't have any forms that would take a string that's needed for the {name}

configuration read the app settings in startup.cs, which is before the function getting triggered - maybe try converting a section from appsettings.json into a Dictionary? See stackoverflow.com/a/45673985/558486. — Rui Jarimba
– Rui Jarimba, Commented Jul 11, 2024 at 17:11
does this only work with appsettings.json? because the app settings I have all the PATs in is on portal. Creating a dictionary on the portal is the double underscore right? I assume it'd look like PAT__companyA, PAT__companyB, PAT__companyC. If i do a var pat = configuration["PAT"], would it retrieve all three of them? — nevermonday
– nevermonday, Commented Jul 11, 2024 at 17:18
If I remember correctly, yes you're correct. For example, if there is a PAT section like "PAT": { "Foo": "xxx", "Bar": "yyy" } then yes, you can access its values using environment variables PAT__Foo and PAT_Bar. Using this solution you should be able to create a dictionary for section PAT. — Rui Jarimba
– Rui Jarimba, Commented Jul 11, 2024 at 17:25
You can still declare that section in the app settings file, with empty or dummy values. Values defined in the portal will override them, if you don't make any mistake :-) — Rui Jarimba
– Rui Jarimba, Commented Jul 11, 2024 at 17:26

Ikhtesam Afrin · Accepted Answer · 2024-07-16 10:42:40Z

0

I am using Environment.GetEnvironmentVariable to access {name}_PAT values from Function App's App settings.
Primarily, I added 2 variables as shown below in App settings.

enter image description here

Then I am using given code to fetch the value.

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;

namespace _78736864
{
    public static class Function1
    {
        [FunctionName("Function1")]
        public static IActionResult Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");
            
            string requestBody = new StreamReader(req.Body).ReadToEnd();
            dynamic data = JsonConvert.DeserializeObject(requestBody);
            string name =  data?.name;

            string patKey = $"{name}_PAT";
            string pat = Environment.GetEnvironmentVariable(patKey);

            return new OkObjectResult(new { PAT = pat });
        }
    }
}

I am able to get the expected values upon function invocation.

enter image description here

answered Jul 16, 2024 at 10:42

Ikhtesam Afrin

6,6902 gold badges4 silver badges11 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Ikhtesam Afrin Over a year ago

@nevermonday check the given solution. Hope this works for you?

Collectives™ on Stack Overflow

Reading variables from app settings another time in Azure Function App

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related