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// Copyright (C) 2024 Vaughn Nugent
//
// This program 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.
//
// This program 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.Net;
using System.Linq;
using System.Threading.Tasks;
using System.Text;
using System.Collections.Generic;
using VNLib.Utils.IO;
using VNLib.Utils.Memory;
using VNLib.Utils.Logging;
using VNLib.Utils.Extensions;
using VNLib.Net.Http;
using VNLib.Plugins;
using VNLib.Plugins.Essentials;
using VNLib.Plugins.Essentials.Endpoints;
using VNLib.Plugins.Extensions.Loading;
using VNLib.Plugins.Essentials.Extensions;
using VNLib.Plugins.Extensions.Loading.Routing;
using SimpleBookmark.Model;
using SimpleBookmark.Model.Widget;
namespace SimpleBookmark.Endpoints
{
[EndpointPath("{{path}}")]
[EndpointLogName("widget-endpoint")]
[ConfigurationName("widgets")]
internal sealed class WidgetEndpoint(PluginBase plugin, IConfigScope config) : UnprotectedWebEndpoint
{
private readonly BookmarkStore bookmarks = plugin.GetOrCreateSingleton<BookmarkStore>();
private readonly WidgetAuthManager authManager = plugin.GetOrCreateSingleton<WidgetAuthManager>();
private readonly bool Enabled = config.GetValueOrDefault("enabled", false);
private readonly string? CorsAclHeaderDomains = config.GetValueOrDefault<string?>("cors-urls", null);
protected override ProtectionSettings EndpointProtectionSettings { get; } = new()
{
DisableSessionsRequired = true,
DisabledTlsRequired = true,
DisableRefererMatch = true,
};
protected override async ValueTask<VfReturnType> GetAsync(HttpEntity entity)
{
if (!Enabled)
{
return VfReturnType.NotFound;
}
string limitStr = entity.QueryArgs.GetValueOrDefault("l", "25");
string pageStr = entity.QueryArgs.GetValueOrDefault("p", "1");
//Get any query arguments
if (entity.QueryArgs.TryGetNonEmptyValue("q", out string? query))
{
//Replace percent encoding with spaces
query = query.Replace('+', ' ');
}
string[] tags = [];
//Get tags
if (entity.QueryArgs.TryGetNonEmptyValue("t", out string? tagsS))
{
//Split tags at spaces and remove empty entries
tags = tagsS.Split('+')
.Where(static t => !string.IsNullOrWhiteSpace(t))
.ToArray();
}
if (!int.TryParse(limitStr, out int limit) || !int.TryParse(pageStr, out int page))
{
return VirtualClose(entity, HttpStatusCode.BadRequest);
}
limit = Math.Clamp(limit, 0, 100);
page = Math.Clamp(page, 0, 100);
/* if (!await authManager.IsTokenValidAsync(entity))
{
return VirtualClose(entity, HttpStatusCode.Unauthorized);
}*/
//Widgets might be loaded in an iframe, so we need to allow cross-site requests
if (CorsAclHeaderDomains is not null && entity.Server.IsCrossSite())
{
entity.Server.Headers.Append("Access-Control-Allow-Origin", CorsAclHeaderDomains);
}
/*
* For now this just returns bookmarks with the "favorite" tag
* an assume the auth manager has set the session's user-id field
*/
BookmarkEntry[] boomarks = await bookmarks.SearchBookmarksAsync(
userId: entity.Session.UserID,
query: query,
tags: tags,
limit: limit,
page: page,
entity.EventCancellation
);
//Output memory buffer
VnMemoryStream output = new(32 * 1024, false);
try
{
string baseUrl = entity.Server.RequestUri.GetLeftPart(UriPartial.Authority);
CompileGlanceTemplate(baseUrl, output, boomarks);
//Assign glance template
entity.Server.Headers["Widget-Title"] = "Simple-Bookmark";
entity.Server.Headers["Widget-Content-Type"] = "html";
return VirtualClose(entity, HttpStatusCode.OK, ContentType.Html, output);
}
catch(Exception ex)
{
output.Dispose();
Log.Error(ex, "Failed to complie glance widget template");
return VirtualClose(entity, HttpStatusCode.InternalServerError);
}
}
private static void CompileGlanceTemplate(string hostUrl, VnMemoryStream vms, BookmarkEntry[] bookmarks)
{
using IMemoryHandle<char> buffer = MemoryUtil.SafeAlloc<char>(32 * 1024, false);
ForwardOnlyWriter<char> writer = new(buffer.Span);
writer.Append("<!DOCTYPE html>");
writer.Append("<html>");
writer.Append("<head>");
writer.Append("<title>Simple-Bookmark Widget</title>");
writer.Append("</head>");
writer.Append("<body>");
writer.Append("<p class='size-h3'>");
writer.Append("<a class='bookmarks-link color-highlight size-h3' href='");
writer.Append(hostUrl);
writer.Append("'>Favorites</a>");
writer.Append("</p>");
writer.Append("<hr class='margin-block-15'/>");
//Start bookmarks list
writer.Append("<ul class='list list-gap-24 list-with-separator'>");
writer.Append("<li class='bookmarks-group'>");
writer.Append("<ul class='list list-gap-2'>");
foreach (BookmarkEntry entry in bookmarks)
{
ReadOnlySpan<char> nameSpan = entry.Name.AsSpan();
nameSpan = nameSpan[..Math.Min(nameSpan.Length, 20)];
writer.Append("<li class='flex items-center gap-10'>");
//Enable the built-in bookmarks link (makes it prettier)
writer.Append("<a class='bookmarks-link color-highlight' href='");
writer.Append(entry.Url);
writer.Append("'>");
writer.Append(nameSpan);
writer.Append("</a>");
writer.Append("</li>");
}
writer.Append("</ul>");
writer.Append("</li>");
writer.Append("</ul>");
//Close the document
writer.Append("</body>");
writer.Append("</html>");
int byteCount = Encoding.UTF8.GetByteCount(writer.AsSpan());
using (UnsafeMemoryHandle<byte> utf8Buffer = MemoryUtil.UnsafeAllocNearestPage(byteCount, true))
{
//Encode utf8 bytes
Encoding.UTF8.GetBytes(writer.AsSpan(), utf8Buffer.Span);
vms.Write(utf8Buffer.AsSpan(0, byteCount));
}
vms.Seek(0, System.IO.SeekOrigin.Begin);
}
}
}
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