1 files changed, 156 insertions, 0 deletions
diff --git a/back-end/src/Model/ChannelManager.cs b/back-end/src/Model/ChannelManager.cs
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+/*
+* Copyright (c) 2023 Vaughn Nugent
+* 
+* Library: CMNext
+* Package: Content.Publishing.Blog.Admin
+* File: ChannelManager.cs 
+*
+* CMNext is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU Affero General Public License as 
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* CMNext is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program. If not, see https://www.gnu.org/licenses/.
+*/
+
+
+using System;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+
+using VNLib.Hashing;
+using VNLib.Plugins;
+using VNLib.Plugins.Extensions.Loading;
+
+using Content.Publishing.Blog.Admin.Storage;
+
+namespace Content.Publishing.Blog.Admin.Model
+{
+
+    [ConfigurationName("blog_channels")]
+    internal sealed class ChannelManager : IChannelContextManager
+    {
+        private readonly IStorageFacade Storage;
+        private readonly string _indexPath;
+
+
+        public ChannelManager(PluginBase plugin, IConfigScope config)
+        {
+            //Init minio client
+            Storage = plugin.GetOrCreateSingleton<ManagedStorage>();
+
+            _indexPath = config["index_file_name"].GetString() ?? "channels.json";
+        }
+
+        ///<inheritdoc/>
+        public async Task<bool> CreateChannelAsync(BlogChannel context, CancellationToken cancellation)
+        {
+            _ = context.Id ?? throw new ArgumentNullException(nameof(context.Id));
+
+            IRecordDb<BlogChannel> db = await LoadDb(cancellation);
+
+            BlogChannel? existing = db.GetRecord(context.Id);
+
+            //Make sure the id is unique
+            if (existing != null)
+            {
+                return false;
+            }
+
+            //Add to the index
+            db.SetRecord(context);
+
+            //Publish updated index to storage
+            await StoreDb(db, cancellation);
+
+            return true;
+        }
+
+        ///<inheritdoc/>
+        public async Task<bool> UpdateChannelAsync(BlogChannel channel, CancellationToken cancellation)
+        {
+            _ = channel.Id ?? throw new ArgumentNullException(nameof(channel.Id));
+
+            IRecordDb<BlogChannel> db = await LoadDb(cancellation);
+
+            //Get the original context for the channel
+            _ = db.GetRecord(channel.Id) ?? throw new KeyNotFoundException("The requested channel does not exist");
+
+            //Add the updated context to the index
+            db.SetRecord(channel);
+
+            //Publish updated index to storage
+            await StoreDb(db, cancellation);
+
+            return true;
+        }
+
+        ///<inheritdoc/>
+        public async Task DeleteChannelAsync(IChannelContext context, CancellationToken cancellation)
+        {
+            _ = context?.Id ?? throw new ArgumentNullException(nameof(context));
+
+            IRecordDb<BlogChannel> db = await LoadDb(cancellation);
+
+            //Remove from the index
+            db.RemoveRecord(context.Id);
+
+            //Delete the channel dir
+            await Storage.DeleteFileAsync(context.BaseDir, cancellation);
+
+            //Publish updated index to storage
+            await StoreDb(db, cancellation);
+        }
+
+        /// <summary>
+        /// Computes the unique id for a context
+        /// </summary>
+        /// <param name="context">The context to produce the context id for</param>
+        /// <returns>The unique context id</returns>
+        public static string ComputeContextId(IChannelContext context)
+        {
+            //Context-id is the hash of the base dir and index file path
+            return ManagedHash.ComputeHexHash($"{context.BaseDir}/{context.IndexPath}", HashAlg.SHA1).ToLowerInvariant();
+        }
+
+        ///<inheritdoc/>
+        public async Task<IChannelContext?> GetChannelAsync(string id, CancellationToken cancellation)
+        {
+            //Recover the db
+            IRecordDb<BlogChannel> db = await LoadDb(cancellation);
+
+            //Get the channel
+            return db.GetRecord(id);
+        }
+
+        ///<inheritdoc/>
+        public async Task<object[]> GetAllContextsAsync(CancellationToken cancellation)
+        {
+            //Recover the db
+            IRecordDb<BlogChannel> db = await LoadDb(cancellation);
+
+            //Get the channel
+            return db.GetRecords().ToArray();
+        }
+
+       
+        private Task<IRecordDb<BlogChannel>> LoadDb(CancellationToken cancellation)
+        {
+            return Storage.LoadDbAsync<BlogChannel>(_indexPath, cancellation);
+        }
+
+        private Task StoreDb(IRecordDb<BlogChannel> db, CancellationToken cancellation)
+        {
+            return Storage.StoreAsync(_indexPath, db, cancellation);
+        }
+
+    }
+}