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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;
using System.Linq;
namespace DevHive.Services.Services
{
public class PostService : IPostService
{
private readonly IUserRepository _userRepository;
private readonly IPostRepository _postRepository;
private readonly ICommentRepository _commentRepository;
private readonly IMapper _postMapper;
public PostService(IUserRepository userRepository, IPostRepository postRepository, ICommentRepository commentRepository, IMapper postMapper)
{
this._userRepository = userRepository;
this._postRepository = postRepository;
this._commentRepository = commentRepository;
this._postMapper = postMapper;
}
#region Create
public async Task<Guid> CreatePost(CreatePostServiceModel createPostServiceModel)
{
Post post = this._postMapper.Map<Post>(createPostServiceModel);
post.TimeCreated = DateTime.Now;
bool success = await this._postRepository.AddAsync(post);
if (success)
{
Post newPost = await this._postRepository
.GetPostByCreatorAndTimeCreatedAsync(createPostServiceModel.IssuerId, createPostServiceModel.TimeCreated);
return newPost.Id;
}
else
return Guid.Empty;
}
public async Task<Guid> AddComment(CreateCommentServiceModel createCommentServiceModel)
{
if (!await this._postRepository.DoesPostExist(createCommentServiceModel.PostId))
throw new ArgumentException("Post does not exist!");
Comment comment = this._postMapper.Map<Comment>(createCommentServiceModel);
createCommentServiceModel.TimeCreated = DateTime.Now;
bool success = await this._commentRepository.AddAsync(comment);
if (success)
{
Comment newComment = await this._commentRepository
.GetCommentByIssuerAndTimeCreatedAsync(createCommentServiceModel.IssuerId, createCommentServiceModel.TimeCreated);
return newComment.Id;
}
else
return Guid.Empty;
}
#endregion
#region Read
public async Task<ReadPostServiceModel> GetPostById(Guid id)
{
Post post = await this._postRepository.GetByIdAsync(id) ??
throw new ArgumentException("The post does not exist!");
return this._postMapper.Map<ReadPostServiceModel>(post);
}
public async Task<ReadCommentServiceModel> GetCommentById(Guid id)
{
Comment comment = await this._commentRepository.GetByIdAsync(id) ??
throw new ArgumentException("The comment does not exist");
return this._postMapper.Map<ReadCommentServiceModel>(comment);
}
#endregion
#region Update
public async Task<Guid> UpdatePost(UpdatePostServiceModel updatePostServiceModel)
{
if (!await this._postRepository.DoesPostExist(updatePostServiceModel.PostId))
throw new ArgumentException("Post does not exist!");
Post post = this._postMapper.Map<Post>(updatePostServiceModel);
bool result = await this._postRepository.EditAsync(updatePostServiceModel.PostId, post);
if (result)
return (await this._postRepository.GetByIdAsync(updatePostServiceModel.PostId)).Id;
else
return Guid.Empty;
}
public async Task<Guid> UpdateComment(UpdateCommentServiceModel updateCommentServiceModel)
{
if (!await this._commentRepository.DoesCommentExist(updateCommentServiceModel.CommentId))
throw new ArgumentException("Comment does not exist!");
Comment comment = this._postMapper.Map<Comment>(updateCommentServiceModel);
bool result = await this._commentRepository.EditAsync(updateCommentServiceModel.CommentId, comment);
if (result)
return (await this._commentRepository.GetByIdAsync(updateCommentServiceModel.CommentId)).Id;
else
return Guid.Empty;
}
#endregion
#region Delete
public async Task<bool> DeletePost(Guid id)
{
if (!await this._postRepository.DoesPostExist(id))
throw new ArgumentException("Post does not exist!");
Post post = await this._postRepository.GetByIdAsync(id);
return await this._postRepository.DeleteAsync(post);
}
public async Task<bool> DeleteComment(Guid id)
{
if (!await this._commentRepository.DoesCommentExist(id))
throw new ArgumentException("Comment does not exist!");
Comment comment = await this._commentRepository.GetByIdAsync(id);
return await this._commentRepository.DeleteAsync(comment);
}
#endregion
#region Validations
public async Task<bool> ValidateJwtForPost(Guid postId, string rawTokenData)
{
Post post = await this._postRepository.GetByIdAsync(postId);
User user = await this.GetUserForValidation(rawTokenData);
return post.CreatorId == user.Id;
}
public async Task<bool> ValidateJwtForComment(Guid commentId, string rawTokenData)
{
Comment comment = await this._commentRepository.GetByIdAsync(commentId);
User user = await this.GetUserForValidation(rawTokenData);
return comment.IssuerId == user.Id;
}
private async Task<User> GetUserForValidation(string rawTokenData)
{
var jwt = new JwtSecurityTokenHandler().ReadJwtToken(rawTokenData.Remove(0, 7));
string jwtUserName = this.GetClaimTypeValues("unique_name", jwt.Claims).First();
//HashSet<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;
}
#endregion
}
}
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