Identity Server - Persist Grantstore

   

Scenario:

Persist authorization grants in DB

Solution:

1. Implement custom IPersistedGrantStore

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using IdentityServer4.Models;
using IdentityServer4.Stores;

namespace MyCoreSolution
{
    public class GrantStore : IPersistedGrantStore
    {
        public async Task<IEnumerable<PersistedGrant>> GetAllAsync(PersistedGrantFilter filter)
        {

            List<GrantInfo> grantInfos = null;

            await Task.Run(() =>
            {
                //get grant by filters like subjectid, type, client etc from DB
            }).ConfigureAwait(false);

            return grantInfos
                .Select(GrantInfoToGrant).ToList();
        }

        public async Task<IEnumerable<PersistedGrant>> GetAllAsync(string subjectId)
        {
            List<GrantInfo> grantInfos = null;

            await Task.Run(() =>
            {
                //get grant by subjectId from DB
            }).ConfigureAwait(false);

            return grantInfos
                .Select(GrantInfoToGrant).ToList();
        }

        public async Task<PersistedGrant> GetAsync(string key)
        {
            List<GrantInfo> grantInfos = null;

            await Task.Run(() =>
            {
                //get grant by subjectId from Key
            }).ConfigureAwait(false);

            return grantInfos
                .Select(GrantInfoToGrant).FirstOrDefault();
        }

        public async Task RemoveAllAsync(string subjectId, string clientId, string type)
        {
            await Task.Run(() =>
            {
                //remove grant by filters
            }).ConfigureAwait(false);
        }

        public async Task RemoveAsync(string key)
        {
            await Task.Run(() =>
            {
                //remove grant by key
            }).ConfigureAwait(false);
        }
        
        public Task RemoveAllAsync(PersistedGrantFilter filter)
        {
            //remove grant by filters

            return Task.CompletedTask;
        }

        public async Task StoreAsync(PersistedGrant grant)
        {
            var grantInfo = new GrantInfo
            {
                Key = grant.Key,
                ClientId = grant.ClientId,
                SubjectId = grant.SubjectId,
                Type = grant.Type,
                Data = grant.Data,
                CreationTime = grant.CreationTime,
                Expiration = grant.Expiration
            };
            //add grants
        }

        private PersistedGrant GrantInfoToGrant(GrantInfo grantInfo)
        {
            return new PersistedGrant()
            {
                Key = grantInfo.Key,
                ClientId = grantInfo.ClientId,
                CreationTime = grantInfo.CreationTime ?? DateTime.Now,
                Data = grantInfo.Data,
                Expiration = grantInfo.Expiration,
                SubjectId = grantInfo.SubjectId,
                Type = grantInfo.Type
            };
        }
    }
}

2.Startup.cs

public void ConfigureServices(IServiceCollection services)
        {
            ...
            services.AddTransient<IPersistedGrantStore, GrantStore>();
        }