Nnews guide

NNews NuGet Package Integration Guide

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NNews — Data Transfer Objects

Install: dotnet add package NNews

NNewsSetting

public class NNewsSetting
{
    public string ApiUrl { get; set; } = string.Empty;  // NNews API base URL
}

ArticleInfo

public class ArticleInfo
{
    public long ArticleId { get; set; }
    public long CategoryId { get; set; }
    public long? AuthorId { get; set; }
    public string? ImageName { get; set; }       // Max 560 chars
    public string Title { get; set; }            // Required, max 255 chars
    public string Content { get; set; }          // Required
    public int Status { get; set; }              // 0=Draft, 1=Published, 2=Archived, 3=Scheduled
    public int ContentType { get; set; } = 2;    // 1=PlainText, 2=Html, 3=MarkDown
    public DateTime DateAt { get; set; }
    public DateTime CreatedAt { get; set; }
    public DateTime UpdatedAt { get; set; }
    public CategoryInfo? Category { get; set; }
    public List<TagInfo> Tags { get; set; } = new();
    public List<RoleInfo> Roles { get; set; } = new();
}

ArticleInsertedInfo

public class ArticleInsertedInfo
{
    public long CategoryId { get; set; }            // Required
    public long? AuthorId { get; set; }
    public string? ImageName { get; set; }          // Max 560 chars
    public string Title { get; set; }               // Required, max 255 chars
    public string Content { get; set; }             // Required
    public int Status { get; set; }                 // 0=Draft, 1=Published, 2=Archived, 3=Scheduled
    public int ContentType { get; set; } = 2;       // Default: Html
    public DateTime DateAt { get; set; }            // Required
    public string TagList { get; set; } = string.Empty;  // Comma-separated tags
    public List<string> Roles { get; set; } = new();     // Role slugs
}

ArticleUpdatedInfo

public class ArticleUpdatedInfo
{
    public long ArticleId { get; set; }
    public long CategoryId { get; set; }
    public long? AuthorId { get; set; }
    public string? ImageName { get; set; }
    public string Title { get; set; }
    public string Content { get; set; }
    public int Status { get; set; }
    public int ContentType { get; set; } = 2;
    public DateTime DateAt { get; set; }
    public string TagList { get; set; } = string.Empty;
    public List<string> Roles { get; set; } = new();
}

CategoryInfo

public class CategoryInfo
{
    public long CategoryId { get; set; }
    public long? ParentId { get; set; }      // For hierarchical categories
    public string Title { get; set; }        // Required, max 240 chars
    public DateTime CreatedAt { get; set; }
    public DateTime UpdatedAt { get; set; }
    public int ArticleCount { get; set; }    // Read-only counter
}

TagInfo

public class TagInfo
{
    public long TagId { get; set; }
    public string Title { get; set; }        // Required, max 120 chars
    public string? Slug { get; set; }        // Max 120 chars
    public int ArticleCount { get; set; }    // Read-only counter
}

RoleInfo

public class RoleInfo
{
    public string Slug { get; set; } = string.Empty;
    public string Name { get; set; } = string.Empty;
}

PagedResult<T>

public class PagedResult<T>
{
    public IList<T> Items { get; set; } = new List<T>();
    public int Page { get; set; }
    public int PageSize { get; set; }
    public int TotalCount { get; set; }
    public int TotalPages { get; set; }
    public bool HasPrevious => Page > 1;
    public bool HasNext => Page < TotalPages;
}

AI DTOs

// Request for AI content generation
public class AIArticleRequest
{
    public long? ArticleId { get; set; }
    public string Prompt { get; set; }              // Required, 10-2000 chars
    public bool GenerateImage { get; set; } = false;
}

// Response from AI generation
public class AIArticleResponse
{
    public string Title { get; set; } = string.Empty;
    public string Content { get; set; } = string.Empty;
    public long CategoryId { get; set; }
    public string TagList { get; set; } = string.Empty;
    public string? ImagePrompt { get; set; }
}

// Response from AI article update
public class AIArticleUpdateResponse
{
    public long ArticleId { get; set; }
    public string Title { get; set; } = string.Empty;
    public string Content { get; set; } = string.Empty;
    public long CategoryId { get; set; }
    public string TagList { get; set; } = string.Empty;
    public string? ImagePrompt { get; set; }
}

// Category summary for AI context
public class AICategorySummary
{
    public long CategoryId { get; set; }
    public string Title { get; set; } = string.Empty;
    public long? ParentId { get; set; }
}

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NNews — Anti-Corruption Layer (ACL)

IArticleClient

public interface IArticleClient
{
    Task<PagedResult<ArticleInfo>> GetAllAsync(long? categoryId = null, int? status = null, int page = 1, int pageSize = 10, CancellationToken cancellationToken = default);
    Task<PagedResult<ArticleInfo>> ListByCategoryAsync(long categoryId, int page = 1, int pageSize = 10, CancellationToken cancellationToken = default);
    Task<PagedResult<ArticleInfo>> ListByRolesAsync(int page = 1, int pageSize = 10, CancellationToken cancellationToken = default);
    Task<PagedResult<ArticleInfo>> ListByTagAsync(string tagSlug, int page = 1, int pageSize = 10, CancellationToken cancellationToken = default);
    Task<PagedResult<ArticleInfo>> SearchAsync(string keyword, int page = 1, int pageSize = 10, CancellationToken cancellationToken = default);
    Task<ArticleInfo> GetByIdAsync(int id, CancellationToken cancellationToken = default);
    Task<ArticleInfo> CreateAsync(ArticleInsertedInfo article, CancellationToken cancellationToken = default);
    Task<ArticleInfo> UpdateAsync(ArticleUpdatedInfo article, CancellationToken cancellationToken = default);
    Task DeleteAsync(int id, CancellationToken cancellationToken = default);
}

IArticleAIClient

public interface IArticleAIClient
{
    Task<ArticleInfo> CreateWithAIAsync(string prompt, bool generateImage = false, CancellationToken cancellationToken = default);
    Task<ArticleInfo> UpdateWithAIAsync(int articleId, string prompt, bool generateImage = false, CancellationToken cancellationToken = default);
}

ICategoryClient

public interface ICategoryClient
{
    Task<IList<CategoryInfo>> GetAllAsync(CancellationToken cancellationToken = default);
    Task<IList<CategoryInfo>> ListByParentAsync(long? parentId = null, CancellationToken cancellationToken = default);
    Task<CategoryInfo> GetByIdAsync(int id, CancellationToken cancellationToken = default);
    Task<CategoryInfo> CreateAsync(CategoryInfo category, CancellationToken cancellationToken = default);
    Task<CategoryInfo> UpdateAsync(CategoryInfo category, CancellationToken cancellationToken = default);
    Task DeleteAsync(int id, CancellationToken cancellationToken = default);
}

ITagClient

public interface ITagClient
{
    Task<IList<TagInfo>> GetAllAsync(CancellationToken cancellationToken = default);
    Task<IList<TagInfo>> ListByRolesAsync(CancellationToken cancellationToken = default);
    Task<TagInfo> GetByIdAsync(int id, CancellationToken cancellationToken = default);
    Task<TagInfo> CreateAsync(TagInfo tag, CancellationToken cancellationToken = default);
    Task<TagInfo> UpdateAsync(TagInfo tag, CancellationToken cancellationToken = default);
    Task DeleteAsync(int id, CancellationToken cancellationToken = default);
    Task MergeTagsAsync(long sourceTagId, long targetTagId, CancellationToken cancellationToken = default);
}

IImageClient

public interface IImageClient
{
    Task<string> UploadImageAsync(IFormFile file, CancellationToken cancellationToken = default);
}

ITenantResolver

public interface ITenantResolver
{
    string TenantId { get; }
    string ConnectionString { get; }
    string JwtSecret { get; }
}

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NNews REST API Endpoints

All endpoints are prefixed by the controller name (e.g., /Article, /Category). Authenticated endpoints require a Bearer JWT token. Tenant is resolved via X-Tenant-Id header or JWT tenant_id claim.

Article (/Article)

Method	Route	Query Params	Body	Auth	Response
GET	/Article	categoryId?, status?, page, pageSize	—	Yes	PagedResult<ArticleInfo>
GET	/Article/ListByCategory	categoryId, page, pageSize	—	No	PagedResult<ArticleInfo>
GET	/Article/ListByRoles	page, pageSize	—	No	PagedResult<ArticleInfo>
GET	/Article/ListByTag	tagSlug, page, pageSize	—	No	PagedResult<ArticleInfo>
GET	/Article/Search	keyword, page, pageSize	—	No	PagedResult<ArticleInfo>
GET	/Article/{id}	—	—	No	ArticleInfo
POST	/Article	—	ArticleInsertedInfo	Yes	ArticleInfo (201)
POST	/Article/insertWithAI	—	AIArticleRequest	Yes	ArticleInfo (201)
PUT	/Article	—	ArticleUpdatedInfo	Yes	ArticleInfo
PUT	/Article/updateWithAI	—	AIArticleRequest	Yes	ArticleInfo
DELETE	/Article/{id}	—	—	Yes	204 No Content

Status filter values: 0 = Draft, 1 = Published, 2 = Archived, 3 = Scheduled

Category (/Category)

Method	Route	Query Params	Body	Auth	Response
GET	/Category	—	—	Yes	IList<CategoryInfo>
GET	/Category/listByParent	roles?, parentId?	—	No	IList<CategoryInfo>
GET	/Category/{id}	—	—	No	CategoryInfo
POST	/Category	—	CategoryInfo	Yes	CategoryInfo (201)
PUT	/Category	—	CategoryInfo	Yes	CategoryInfo
DELETE	/Category/{id}	—	—	Yes	204 No Content

Tag (/Tag)

Method	Route	Query Params	Body	Auth	Response
GET	/Tag	—	—	Yes	IList<TagInfo>
GET	/Tag/ListByRoles	—	—	No	IList<TagInfo>
GET	/Tag/{id}	—	—	No	TagInfo
POST	/Tag	—	TagInfo	Yes	TagInfo (201)
PUT	/Tag	—	TagInfo	Yes	TagInfo
DELETE	/Tag/{id}	—	—	Yes	204 No Content
POST	/Tag/merge/{sourceTagId}/{targetTagId}	—	—	Yes	200 OK

Image (/Image)

Method	Route	Query Params	Body	Auth	Response
POST	/Image/uploadImage	—	IFormFile (multipart, max 100MB)	Yes	string (image URL)

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Multi-Tenancy

NNews supports multi-tenancy via the X-Tenant-Id HTTP header.

TenantHeaderHandler

A DelegatingHandler that automatically adds the X-Tenant-Id header to all outgoing HTTP requests. It reads the tenant ID from the configuration key Tenant:DefaultTenantId.

TenantResolver

Implements ITenantResolver. Reads tenant configuration from:

• Tenant:DefaultTenantId — the default tenant ID
• Tenants:{TenantId}:ConnectionString — database connection string
• Tenants:{TenantId}:JwtSecret — JWT secret for the tenant

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Step-by-Step Integration

1. Install Package

dotnet add package NNews

2. Configure appsettings.json

{
  "NNews": {
    "ApiUrl": "http://localhost:5007"
  },
  "Tenant": {
    "DefaultTenantId": "my-tenant"
  }
}

Docker: use "ApiUrl": "http://nnews-api:80".

3. Register Services (DI)

using NNews.ACL;
using NNews.ACL.Interfaces;
using NNews.ACL.Handlers;
using NNews.ACL.Services;
using NNews.DTO.Settings;

// Settings
services.Configure<NNewsSetting>(configuration.GetSection("NNews"));

// Tenant resolver
services.AddScoped<ITenantResolver, TenantResolver>();

// Register TenantHeaderHandler for automatic X-Tenant-Id header
services.AddTransient<TenantHeaderHandler>();

// Register HttpClients with TenantHeaderHandler
services.AddHttpClient<IArticleClient, ArticleClient>()
    .AddHttpMessageHandler<TenantHeaderHandler>();

services.AddHttpClient<IArticleAIClient, ArticleAIClient>()
    .AddHttpMessageHandler<TenantHeaderHandler>();

services.AddHttpClient<ICategoryClient, CategoryClient>()
    .AddHttpMessageHandler<TenantHeaderHandler>();

services.AddHttpClient<ITagClient, TagClient>()
    .AddHttpMessageHandler<TenantHeaderHandler>();

services.AddHttpClient<IImageClient, ImageClient>()
    .AddHttpMessageHandler<TenantHeaderHandler>();

4. Register Only What You Need

If you only need to read articles (e.g., a public blog frontend), register only the necessary clients:

services.Configure<NNewsSetting>(configuration.GetSection("NNews"));
services.AddTransient<TenantHeaderHandler>();

services.AddHttpClient<IArticleClient, ArticleClient>()
    .AddHttpMessageHandler<TenantHeaderHandler>();

services.AddHttpClient<ICategoryClient, CategoryClient>()
    .AddHttpMessageHandler<TenantHeaderHandler>();

services.AddHttpClient<ITagClient, TagClient>()
    .AddHttpMessageHandler<TenantHeaderHandler>();

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Usage Examples

List Articles (Paginated)

public class BlogService
{
    private readonly IArticleClient _articleClient;

    public BlogService(IArticleClient articleClient)
    {
        _articleClient = articleClient;
    }

    public async Task<PagedResult<ArticleInfo>> GetLatestArticles(int page = 1, int pageSize = 12)
    {
        return await _articleClient.GetAllAsync(page: page, pageSize: pageSize);
    }

    public async Task<PagedResult<ArticleInfo>> GetPublishedArticles(int page = 1, int pageSize = 12)
    {
        // Filter by status: 0=Draft, 1=Published, 2=Archived, 3=Scheduled
        return await _articleClient.GetAllAsync(status: 1, page: page, pageSize: pageSize);
    }
}

List Articles by Category

public async Task<PagedResult<ArticleInfo>> GetByCategory(long categoryId, int page = 1)
{
    return await _articleClient.ListByCategoryAsync(categoryId, page: page, pageSize: 10);
}

List Articles by Tag

public async Task<PagedResult<ArticleInfo>> GetByTag(string tagSlug, int page = 1)
{
    return await _articleClient.ListByTagAsync(tagSlug, page: page, pageSize: 10);
}

Search Articles

public async Task<PagedResult<ArticleInfo>> Search(string keyword, int page = 1)
{
    return await _articleClient.SearchAsync(keyword, page: page, pageSize: 10);
}

Get Single Article

public async Task<ArticleInfo> GetArticle(int id)
{
    return await _articleClient.GetByIdAsync(id);
}

Create Article

public async Task<ArticleInfo> CreateArticle()
{
    var article = new ArticleInsertedInfo
    {
        Title = "My First Article",
        Content = "<p>Hello World!</p>",
        CategoryId = 1,
        Status = 1,           // Published
        ContentType = 2,       // Html
        DateAt = DateTime.UtcNow,
        TagList = "dotnet,csharp,webapi",
        Roles = new List<string> { "admin", "editor" }
    };

    return await _articleClient.CreateAsync(article);
}

Update Article

public async Task<ArticleInfo> UpdateArticle(long articleId)
{
    var article = new ArticleUpdatedInfo
    {
        ArticleId = articleId,
        Title = "Updated Title",
        Content = "<p>Updated content</p>",
        CategoryId = 1,
        Status = 1,
        ContentType = 2,
        DateAt = DateTime.UtcNow,
        TagList = "dotnet,updated"
    };

    return await _articleClient.UpdateAsync(article);
}

Delete Article

public async Task DeleteArticle(int articleId)
{
    await _articleClient.DeleteAsync(articleId);
}

Create Article with AI

public async Task<ArticleInfo> CreateWithAI(string prompt, bool withImage = false)
{
    return await _articleAIClient.CreateWithAIAsync(prompt, generateImage: withImage);
}

// Example usage:
// var article = await CreateWithAI("Write an article about clean architecture in .NET 8", withImage: true);

Update Article with AI

public async Task<ArticleInfo> UpdateWithAI(int articleId, string prompt)
{
    return await _articleAIClient.UpdateWithAIAsync(articleId, prompt, generateImage: false);
}

Category Management

public async Task CategoryExamples()
{
    // List all categories
    var categories = await _categoryClient.GetAllAsync();

    // List root categories (no parent)
    var rootCategories = await _categoryClient.ListByParentAsync(parentId: null);

    // List subcategories
    var subCategories = await _categoryClient.ListByParentAsync(parentId: 1);

    // Create category
    var newCategory = await _categoryClient.CreateAsync(new CategoryInfo
    {
        Title = "Technology",
        ParentId = null  // Root category
    });

    // Create subcategory
    var subCategory = await _categoryClient.CreateAsync(new CategoryInfo
    {
        Title = "Web Development",
        ParentId = newCategory.CategoryId
    });

    // Delete category
    await _categoryClient.DeleteAsync((int)newCategory.CategoryId);
}

Tag Management

public async Task TagExamples()
{
    // List all tags
    var tags = await _tagClient.GetAllAsync();

    // List tags filtered by user roles
    var roleTags = await _tagClient.ListByRolesAsync();

    // Create tag
    var newTag = await _tagClient.CreateAsync(new TagInfo { Title = "C#" });

    // Merge tags (move all articles from source to target, then delete source)
    await _tagClient.MergeTagsAsync(sourceTagId: 5, targetTagId: 2);

    // Delete tag
    await _tagClient.DeleteAsync((int)newTag.TagId);
}

Image Upload

[HttpPost("upload")]
[Authorize]
public async Task<ActionResult<string>> UploadImage(IFormFile file)
{
    if (file == null || file.Length == 0)
        return BadRequest("No file uploaded");

    var imageUrl = await _imageClient.UploadImageAsync(file);
    return Ok(imageUrl);
}

Controller Example — Blog API

using Microsoft.AspNetCore.Mvc;
using NNews.ACL.Interfaces;
using NNews.DTO;

[Route("api/[controller]")]
[ApiController]
public class BlogController : ControllerBase
{
    private readonly IArticleClient _articleClient;
    private readonly ICategoryClient _categoryClient;
    private readonly ITagClient _tagClient;

    public BlogController(
        IArticleClient articleClient,
        ICategoryClient categoryClient,
        ITagClient tagClient)
    {
        _articleClient = articleClient;
        _categoryClient = categoryClient;
        _tagClient = tagClient;
    }

    [HttpGet("articles")]
    public async Task<ActionResult<PagedResult<ArticleInfo>>> GetArticles(
        [FromQuery] int page = 1,
        [FromQuery] int pageSize = 12,
        [FromQuery] long? categoryId = null,
        [FromQuery] int? status = null)
    {
        var result = await _articleClient.GetAllAsync(categoryId, status, page, pageSize);
        return Ok(result);
    }

    [HttpGet("articles/{id}")]
    public async Task<ActionResult<ArticleInfo>> GetArticle(int id)
    {
        var article = await _articleClient.GetByIdAsync(id);
        return Ok(article);
    }

    [HttpGet("articles/search")]
    public async Task<ActionResult<PagedResult<ArticleInfo>>> Search(
        [FromQuery] string keyword,
        [FromQuery] int page = 1)
    {
        var result = await _articleClient.SearchAsync(keyword, page);
        return Ok(result);
    }

    [HttpDelete("articles/{id}")]
    public async Task<IActionResult> DeleteArticle(int id)
    {
        await _articleClient.DeleteAsync(id);
        return NoContent();
    }

    [HttpGet("categories")]
    public async Task<ActionResult<IList<CategoryInfo>>> GetCategories()
    {
        var categories = await _categoryClient.GetAllAsync();
        return Ok(categories);
    }

    [HttpGet("tags")]
    public async Task<ActionResult<IList<TagInfo>>> GetTags()
    {
        var tags = await _tagClient.GetAllAsync();
        return Ok(tags);
    }
}

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Troubleshooting

Issue	Cause	Solution
HTTP 500 on all requests	NNews API unreachable	Verify NNews:ApiUrl in appsettings
HTTP 401 Unauthorized	Missing or invalid auth token	Ensure Bearer token is forwarded or endpoint is public
Empty PagedResult	Wrong tenant or no data	Check Tenant:DefaultTenantId configuration
DI error for IArticleClient	Missing registration	Add services.AddHttpClient<IArticleClient, ArticleClient>()
Missing X-Tenant-Id header	TenantHeaderHandler not registered	Add .AddHttpMessageHandler<TenantHeaderHandler>()
NNewsSetting.ApiUrl empty	Missing configuration section	Add "NNews": { "ApiUrl": "..." } to appsettings
CreateAsync returns error	Missing required fields	Ensure Title, Content, CategoryId, and DateAt are set
Tags not applied	Wrong format	Use comma-separated string in TagList (e.g., "tag1,tag2,tag3")

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Response Guidelines

1. Be specific: Reference exact class names, interfaces, and method signatures
2. Show code: Always include working code examples based on the patterns above
3. Context-aware: If the user is working in a project that consumes NNews, reference their existing DI setup and configuration
4. Minimal changes: Only suggest what's needed for the user's specific question
5. Multi-tenancy: Always remind about configuring Tenant:DefaultTenantId and registering TenantHeaderHandler
6. Prerequisites: Mention required NuGet package and configuration if starting fresh