oliverbooth.dev/OliverBooth/Services/BlogPostService.cs

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C#
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using System.Diagnostics.CodeAnalysis;
using Humanizer;
using Markdig;
using Microsoft.EntityFrameworkCore;
using OliverBooth.Data.Blog;
namespace OliverBooth.Services;
/// <summary>
/// Represents an implementation of <see cref="IBlogPostService" />.
/// </summary>
internal sealed class BlogPostService : IBlogPostService
{
private readonly IDbContextFactory<BlogContext> _dbContextFactory;
private readonly IBlogUserService _blogUserService;
private readonly MarkdownPipeline _markdownPipeline;
/// <summary>
/// Initializes a new instance of the <see cref="BlogPostService" /> class.
/// </summary>
/// <param name="dbContextFactory">
/// The <see cref="IDbContextFactory{TContext}" /> used to create a <see cref="BlogContext" />.
/// </param>
/// <param name="blogUserService">The <see cref="IBlogUserService" />.</param>
/// <param name="markdownPipeline">The <see cref="MarkdownPipeline" />.</param>
public BlogPostService(IDbContextFactory<BlogContext> dbContextFactory,
IBlogUserService blogUserService,
MarkdownPipeline markdownPipeline)
{
_dbContextFactory = dbContextFactory;
_blogUserService = blogUserService;
_markdownPipeline = markdownPipeline;
}
/// <inheritdoc />
public int GetBlogPostCount()
{
using BlogContext context = _dbContextFactory.CreateDbContext();
return context.BlogPosts.Count();
}
/// <inheritdoc />
public IReadOnlyList<IBlogPost> GetAllBlogPosts(int limit = -1)
{
using BlogContext context = _dbContextFactory.CreateDbContext();
IQueryable<BlogPost> ordered = context.BlogPosts
.Where(p => p.Visibility == BlogPostVisibility.Published)
.OrderByDescending(post => post.Published);
if (limit > -1)
{
ordered = ordered.Take(limit);
}
return ordered.AsEnumerable().Select(CacheAuthor).ToArray();
}
/// <inheritdoc />
public IReadOnlyList<IBlogPost> GetBlogPosts(int page, int pageSize = 10)
{
using BlogContext context = _dbContextFactory.CreateDbContext();
return context.BlogPosts
.Where(p => p.Visibility == BlogPostVisibility.Published)
.OrderByDescending(post => post.Published)
.Skip(page * pageSize)
.Take(pageSize)
.ToArray().Select(CacheAuthor).ToArray();
}
/// <inheritdoc />
public IBlogPost? GetNextPost(IBlogPost blogPost)
{
using BlogContext context = _dbContextFactory.CreateDbContext();
return context.BlogPosts
.Where(p => p.Visibility == BlogPostVisibility.Published)
.OrderBy(post => post.Published)
.FirstOrDefault(post => post.Published > blogPost.Published);
}
/// <inheritdoc />
public IBlogPost? GetPreviousPost(IBlogPost blogPost)
{
using BlogContext context = _dbContextFactory.CreateDbContext();
return context.BlogPosts
.Where(p => p.Visibility == BlogPostVisibility.Published)
.OrderByDescending(post => post.Published)
.FirstOrDefault(post => post.Published < blogPost.Published);
}
/// <inheritdoc />
public string RenderExcerpt(IBlogPost post, out bool wasTrimmed)
{
string body = post.Body;
int moreIndex = body.IndexOf("<!--more-->", StringComparison.Ordinal);
if (moreIndex == -1)
{
string excerpt = body.Truncate(255, "...");
wasTrimmed = body.Length > 255;
return Markdig.Markdown.ToHtml(excerpt, _markdownPipeline);
}
wasTrimmed = true;
return Markdig.Markdown.ToHtml(body[..moreIndex], _markdownPipeline);
}
/// <inheritdoc />
public string RenderPost(IBlogPost post)
{
return Markdig.Markdown.ToHtml(post.Body, _markdownPipeline);
}
/// <inheritdoc />
public bool TryGetPost(Guid id, [NotNullWhen(true)] out IBlogPost? post)
{
using BlogContext context = _dbContextFactory.CreateDbContext();
post = context.BlogPosts.Find(id);
if (post is null)
{
return false;
}
CacheAuthor((BlogPost)post);
return true;
}
/// <inheritdoc />
public bool TryGetPost(int id, [NotNullWhen(true)] out IBlogPost? post)
{
using BlogContext context = _dbContextFactory.CreateDbContext();
post = context.BlogPosts.FirstOrDefault(p => p.WordPressId == id);
if (post is null)
{
return false;
}
CacheAuthor((BlogPost)post);
return true;
}
/// <inheritdoc />
public bool TryGetPost(DateOnly publishDate, string slug, [NotNullWhen(true)] out IBlogPost? post)
{
using BlogContext context = _dbContextFactory.CreateDbContext();
post = context.BlogPosts.FirstOrDefault(post => post.Published.Year == publishDate.Year &&
post.Published.Month == publishDate.Month &&
post.Published.Day == publishDate.Day &&
post.Slug == slug);
if (post is null)
{
return false;
}
CacheAuthor((BlogPost)post);
return true;
}
private BlogPost CacheAuthor(BlogPost post)
{
// ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
if (post.Author is not null)
{
return post;
}
if (_blogUserService.TryGetUser(post.AuthorId, out IUser? user) && user is IBlogAuthor author)
{
post.Author = author;
}
return post;
}
}