nethereum_sample

Nethereum Connection Sample

This is a Nethereum sample to connect our transaction nodes without the blockchain connector.

Quickstart

This sample uses two packages from Nethereum and ADAL.

dotnet add package Nethereum.Web3
dotnet add package Microsoft.IdentityModel.Clients.ActiveDirectory

In Program.cs, we demonstrate how to configure basic authentication and AAD OAuth2 to create a Nethereum.Web3 object. Then you can use the instance to access to a target transaction node.

Basic Authentication

To configure basic auth, you need to encode your username and password into a base64 string, and then put it into a header. Nethereum.Web3 supports setting an auth header in RpcClient's constructor.

var authValue = Convert.ToBase64String(Encoding.UTF8.GetBytes($"{username}:{password}"));
var authHeader = new AuthenticationHeaderValue("Basic", authValue);
var web3 = Web3(new RpcClient(new Uri(nodeUri), authHeader, null, null));

Azure Active Directory OAuth2

In short, using AAD OAuth2 is to retrieve a token via the ADAL library, and then set it in requests' headers. This is similar to basic auth, but you should notice to handle exceptions for the token retrieve process.

var tok = await retrieveToken(config);
var authHeader = new AuthenticationHeaderValue("Bearer", tok.AccessToken);
var web3 = Web3(new RpcClient(new Uri(nodeUri), authHeader, null, null));

For example, the retrieveToken("aadauthcode") above can be equivalent to:

ctx.AcquireTokenAsync(resource, clientId, new Uri(redirectUri), new PlatformParameters(PromptBehavior.SelectAccount));