Azure auth method

package main import (    "context"    "fmt"     vault "github.com/hashicorp/vault/api"    auth "github.com/hashicorp/vault/api/auth/azure") // Fetches a key-value secret (kv-v2) after authenticating to Vault via Azure authentication.// This example assumes you have a configured Azure AD Application.func getSecretWithAzureAuth() (string, error) {    config := vault.DefaultConfig() // modify for more granular configuration     client, err := vault.NewClient(config)    if err != nil {        return "", fmt.Errorf("unable to initialize Vault client: %w", err)    }     azureAuth, err := auth.NewAzureAuth(        "dev-role-azure",    )    if err != nil {        return "", fmt.Errorf("unable to initialize Azure auth method: %w", err)    }     authInfo, err := client.Auth().Login(context.Background(), azureAuth)    if err != nil {        return "", fmt.Errorf("unable to login to Azure auth method: %w", err)    }    if authInfo == nil {        return "", fmt.Errorf("no auth info was returned after login")    }     // get secret from the default mount path for KV v2 in dev mode, "secret"    secret, err := client.KVv2("secret").Get(context.Background(), "creds")    if err != nil {        return "", fmt.Errorf("unable to read secret: %w", err)    }     // data map can contain more than one key-value pair,    // in this case we're just grabbing one of them    value, ok := secret.Data["password"].(string)    if !ok {        return "", fmt.Errorf("value type assertion failed: %T %#v", secret.Data["password"], secret.Data["password"])    }     return value, nil} 

using System;using System.Collections.Generic;using System.IO;using System.Net;using System.Net.Http;using System.Text;using Newtonsoft.Json;using VaultSharp;using VaultSharp.V1.AuthMethods;using VaultSharp.V1.AuthMethods.Azure;using VaultSharp.V1.Commons; namespace Examples{    public class AzureAuthExample    {        public class InstanceMetadata        {            public string name { get; set; }            public string resourceGroupName { get; set; }            public string subscriptionId { get; set; }        }         const string MetadataEndPoint = "http://169.254.169.254/metadata/instance?api-version=2017-08-01";        const string AccessTokenEndPoint = "http://169.254.169.254/metadata/identity/oauth2/token?api-version=2018-02-01&resource=https://management.azure.com/";         /// <summary>        /// Fetches a key-value secret (kv-v2) after authenticating to Vault via Azure authentication.        /// This example assumes you have a configured Azure AD Application.        /// </summary>        public string GetSecretWithAzureAuth()        {            string vaultAddr = Environment.GetEnvironmentVariable("VAULT_ADDR");            if(String.IsNullOrEmpty(vaultAddr))            {                throw new System.ArgumentNullException("Vault Address");            }             string roleName = Environment.GetEnvironmentVariable("VAULT_ROLE");            if(String.IsNullOrEmpty(roleName))            {                throw new System.ArgumentNullException("Vault Role Name");            }             string jwt = GetJWT();            InstanceMetadata metadata = GetMetadata();             IAuthMethodInfo authMethod = new AzureAuthMethodInfo(roleName: roleName, jwt: jwt, subscriptionId: metadata.subscriptionId, resourceGroupName: metadata.resourceGroupName, virtualMachineName: metadata.name);            var vaultClientSettings = new VaultClientSettings(vaultAddr, authMethod);             IVaultClient vaultClient = new VaultClient(vaultClientSettings);             // We can retrieve the secret from the VaultClient object            Secret<SecretData> kv2Secret = null;            kv2Secret = vaultClient.V1.Secrets.KeyValue.V2.ReadSecretAsync(path: "/creds").Result;             var password = kv2Secret.Data.Data["password"];             return password.ToString();        }         /// <summary>        /// Query Azure Resource Manage for metadata about the Azure instance        /// </summary>        private InstanceMetadata GetMetadata()        {            HttpWebRequest metadataRequest = (HttpWebRequest)WebRequest.Create(MetadataEndPoint);            metadataRequest.Headers["Metadata"] = "true";            metadataRequest.Method = "GET";             HttpWebResponse metadataResponse = (HttpWebResponse)metadataRequest.GetResponse();             StreamReader streamResponse = new StreamReader(metadataResponse.GetResponseStream());            string stringResponse = streamResponse.ReadToEnd();            var resultsDict = JsonConvert.DeserializeObject<Dictionary<string, InstanceMetadata>>(stringResponse);             return resultsDict["compute"];        }         /// <summary>        /// Query Azure Resource Manager (ARM) for an access token        /// </summary>        private string GetJWT()        {            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(AccessTokenEndPoint);            request.Headers["Metadata"] = "true";            request.Method = "GET";             HttpWebResponse response = (HttpWebResponse)request.GetResponse();             // Pipe response Stream to a StreamReader and extract access token            StreamReader streamResponse = new StreamReader(response.GetResponseStream());            string stringResponse = streamResponse.ReadToEnd();            var resultsDict = JsonConvert.DeserializeObject<Dictionary<string, string>>(stringResponse);             return resultsDict["access_token"];        }    }}