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using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using AutoMapper;
using DevHive.Data.Models;
using DevHive.Services.Models.Post.Comment;
using DevHive.Services.Models.Post.Post;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using DevHive.Services.Interfaces;
using DevHive.Data.Interfaces.Repositories;
namespace DevHive.Services.Services
{
public class PostService : IPostService
{
private readonly IPostRepository _postRepository;
private readonly IUserRepository _userRepository;
private readonly IMapper _postMapper;
public PostService(IPostRepository postRepository, IUserRepository userRepository, IMapper postMapper)
{
this._postRepository = postRepository;
this._userRepository = userRepository;
this._postMapper = postMapper;
}
//Create
public async Task<Guid> CreatePost(CreatePostServiceModel postServiceModel)
{
Post post = this._postMapper.Map<Post>(postServiceModel);
bool success = await this._postRepository.AddAsync(post);
if(success)
{
Post newPost = await this._postRepository.GetPostByIssuerAndTimeCreatedAsync(postServiceModel.IssuerId, postServiceModel.TimeCreated);
return newPost.Id;
}
else
return Guid.Empty;
}
public async Task<Guid> AddComment(CreateCommentServiceModel commentServiceModel)
{
commentServiceModel.TimeCreated = DateTime.Now;
Comment comment = this._postMapper.Map<Comment>(commentServiceModel);
bool success = await this._postRepository.AddCommentAsync(comment);
if(success)
{
Comment newComment = await this._postRepository.GetCommentByIssuerAndTimeCreatedAsync(commentServiceModel.IssuerId, commentServiceModel.TimeCreated);
return newComment.Id;
}
else
return Guid.Empty;
}
//Read
public async Task<PostServiceModel> GetPostById(Guid id)
{
Post post = await this._postRepository.GetByIdAsync(id)
?? throw new ArgumentException("Post does not exist!");
return this._postMapper.Map<PostServiceModel>(post);
}
public async Task<CommentServiceModel> GetCommentById(Guid id)
{
Comment comment = await this._postRepository.GetCommentByIdAsync(id);
if (comment == null)
throw new ArgumentException("The comment does not exist");
return this._postMapper.Map<CommentServiceModel>(comment);
}
//Update
public async Task<bool> UpdatePost(UpdatePostServiceModel postServiceModel)
{
if (!await this._postRepository.DoesPostExist(postServiceModel.IssuerId))
throw new ArgumentException("Comment does not exist!");
Post post = this._postMapper.Map<Post>(postServiceModel);
return await this._postRepository.EditAsync(post);
}
public async Task<bool> UpdateComment(UpdateCommentServiceModel commentServiceModel)
{
if (!await this._postRepository.DoesCommentExist(commentServiceModel.Id))
throw new ArgumentException("Comment does not exist!");
Comment comment = this._postMapper.Map<Comment>(commentServiceModel);
bool result = await this._postRepository.EditCommentAsync(comment);
return result;
}
//Delete
public async Task<bool> DeletePost(Guid id)
{
Post post = await this._postRepository.GetByIdAsync(id);
return await this._postRepository.DeleteAsync(post);
}
public async Task<bool> DeleteComment(Guid id)
{
if (!await this._postRepository.DoesCommentExist(id))
throw new ArgumentException("Comment does not exist!");
Comment comment = await this._postRepository.GetCommentByIdAsync(id);
bool result = await this._postRepository.DeleteCommentAsync(comment);
return result;
}
//Validate
public async Task<bool> ValidateJwtForComment(Guid commentId, string rawTokenData)
{
Comment comment = await this._postRepository.GetCommentByIdAsync(commentId);
User user = await this.GetUserForValidation(rawTokenData);
if (comment.IssuerId != user.Id)
return false;
return true;
}
private async Task<User> GetUserForValidation(string rawTokenData)
{
var jwt = new JwtSecurityTokenHandler().ReadJwtToken(rawTokenData.Remove(0, 7));
string jwtUserName = this.GetClaimTypeValues("unique_name", jwt.Claims)[0];
//List<string> jwtRoleNames = this.GetClaimTypeValues("role", jwt.Claims);
User user = await this._userRepository.GetByUsernameAsync(jwtUserName)
?? throw new ArgumentException("User does not exist!");
return user;
}
private List<string> GetClaimTypeValues(string type, IEnumerable<Claim> claims)
{
List<string> toReturn = new();
foreach (var claim in claims)
if (claim.Type == type)
toReturn.Add(claim.Value);
return toReturn;
}
}
}
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