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Startup.cs
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Startup.cs
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using System;
using System.IO;
using API.Authentication;
using API.Authorization.Decision;
using API.Authorization.RPT;
using API.Models;
using IdentityModel.Client;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
namespace API
{
public class Startup
{
private const string RoleClaimType = "role";
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddHttpContextAccessor();
services.AddCors(options =>
{
options.AddDefaultPolicy(builder =>
{
builder.AllowAnyHeader().AllowAnyMethod().AllowAnyOrigin();
});
});
services.AddControllers();
services.AddDbContext<ApiDbContext>(options =>
{
var databasePath = Path.Combine(Path.GetTempPath(), "webinar-keycloak-authorization.db");
options.UseSqlite($"Data Source={databasePath}");
});
services.AddSwaggerGen(c =>
{
c.SwaggerDoc("v1"
, new OpenApiInfo
{
Title = "API"
, Version = "v1"
});
});
// Configure authentication
var jwtOptions = Configuration.GetSection("JwtBearer").Get<JwtBearerOptions>();
services
.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
.AddJwtBearer(options =>
{
options.Authority = jwtOptions.Authority;
options.Audience = jwtOptions.Audience;
options.RequireHttpsMetadata = false;
options.TokenValidationParameters = new TokenValidationParameters
{
NameClaimType = "preferred_username"
,
// Specify what the claim name is, for roles.
// Needed so ASP.NET Core knowns where to look for the roles of the user.
RoleClaimType = RoleClaimType
};
});
services.AddTransient<IClaimsTransformation>(_ =>
new KeycloakRolesClaimsTransformation(RoleClaimType, jwtOptions.Audience));
// Configure authorization
services.AddSingleton<IAuthorizationHandler, DecisionRequirementHandler>();
services.AddSingleton<IAuthorizationHandler, RptRequirementHandler>();
services.AddAuthorization(options =>
{
#region Decision Requirements
options.AddPolicy("customers#read"
, builder => builder.AddRequirements(new DecisionRequirement("customers", "read"))
);
options.AddPolicy("customers#update"
, builder => builder.AddRequirements(new DecisionRequirement("customers", "update"))
);
options.AddPolicy("customers#delete"
, builder => builder.AddRequirements(new DecisionRequirement("customers", "delete"))
);
#endregion
#region Rpt Requirements
options.AddPolicy("projects#create"
, builder => builder.AddRequirements(new RptRequirement("projects", "create"))
);
options.AddPolicy("projects#read"
, builder => builder.AddRequirements(new RptRequirement("projects", "read"))
);
options.AddPolicy("projects#delete"
, builder => builder.AddRequirements(new RptRequirement("projects", "delete"))
);
#endregion
#region Resource Based RPT requirement
options.AddPolicy("projects#archive"
, builder => builder.RequireAssertion(async context =>
{
var httpContext = context.Resource as HttpContext;
if (httpContext == null)
{
return false;
}
var authorizationService =
httpContext.RequestServices.GetRequiredService<IAuthorizationService>();
var policy =
new AuthorizationPolicyBuilder(JwtBearerDefaults.AuthenticationScheme)
.AddRequirements(new RptRequirement(
$"projects/{httpContext.Request.RouteValues["id"]}"
, "archive")
).Build();
var result = await authorizationService.AuthorizeAsync(httpContext.User, policy);
return result.Succeeded;
}));
#endregion
});
services.AddHttpClient<KeycloakService>(client =>
{
client.BaseAddress = new Uri(Configuration["KeycloakResourceUrl"]);
});
services.AddHttpClient<TokenClient>();
services.AddSingleton(_ =>
Configuration.GetSection("ClientCredentialsTokenRequest").Get<ClientCredentialsTokenRequest>());
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.UseSwagger();
app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "API v1"));
}
app.UseHttpsRedirection();
app.UseCors();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints => { endpoints.MapControllers(); });
}
}
}