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namespace marlin.web.Services;
using System.Security.Claims;
using System.Text.Encodings.Web;
using Data;
using Microsoft.AspNetCore.Authentication;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.Primitives;
public class AgentSchemeOptions : AuthenticationSchemeOptions
{
public const string Name = "Agent";
public string AgentHeader { get; set; } = "Agent";
public string JobHeader { get; set; } = "Job";
}
public class AgentAuthenticationHandler : AuthenticationHandler<AgentSchemeOptions>
{
private readonly ApplicationDbContext _dbContext;
public AgentAuthenticationHandler(
IOptionsMonitor<AgentSchemeOptions> options,
ILoggerFactory logger,
UrlEncoder encoder,
ApplicationDbContext dbContext) : base(options, logger, encoder)
{
this._dbContext = dbContext;
}
private bool TryReadPair(string headerName, out Guid id, out string token)
{
id = Guid.Empty;
token = string.Empty;
if (!Request.Headers.TryGetValue(headerName, out StringValues header))
return false;
var parts = header.ToString().Split(' ', 2);
if (parts.Length != 2 || parts[1].Length == 0)
return false;
token = parts[1];
return Guid.TryParse(parts[0], out id);
}
protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
{
var claims = new List<Claim>();
if (!TryReadPair(Options.AgentHeader, out var agentId, out var agentToken))
return AuthenticateResult.NoResult();
var agent = await this._dbContext.Agents
.FirstOrDefaultAsync(x => x.Id == agentId && x.AuthToken == agentToken);
if (agent == null)
return AuthenticateResult.Fail("Invalid agent credentials.");
claims.Add(new Claim("agent_id", agent.Id.ToString()));
if (TryReadPair(Options.JobHeader, out var jobId, out var jobToken))
{
var job = await this._dbContext.Jobs
.FirstOrDefaultAsync(x => x.Id == jobId && x.AgentId == agent.Id && x.ClaimToken == jobToken);
if (job == null)
return AuthenticateResult.Fail("Invalid job claim token.");
claims.Add(new Claim("job_id", job.Id.ToString()));
}
var identity = new ClaimsIdentity(claims, this.Scheme.Name);
var principal = new ClaimsPrincipal(identity);
var ticket = new AuthenticationTicket(principal, this.Scheme.Name);
return AuthenticateResult.Success(ticket);
}
}
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