public IQueryable<PostModel> GetAllPosts(
[ValueProvider(typeof(HeaderValueProviderFactory<string>))] string sessionKey)
{
var responseMsg = this.PerfromOperationAndHandleException(() =>
{
var dbContext = new AcadBlogContext();
this.ValidateAndGetUserBySessionKey(dbContext, sessionKey);
var postModels = dbContext.Posts.Select(
p => new PostModel()
{
Id = p.Id,
Title = p.Title,
PostedBy = p.User.Displayname,
PostDate = p.PostDate,
Text = p.Content,
Tags = p.Tags.Select(t => t.Title),
Comments = p.Comments.Select(
c => new CommentModel()
{
Text = c.Content,
CommentedBy = c.User.Displayname,
PostDate = c.DateCreated
})
});
return postModels.OrderByDescending(p => p.PostDate);
});
return responseMsg;
}
private User ValidateAndGetUserBySessionKey(AcadBlogContext dbContext,
string sessionKey)
{
var user = dbContext.Users.FirstOrDefault(
u => u.SessionKey == sessionKey);
if (user == null)
{
throw new InvalidOperationException("Incorrect session key.");
}
return user;
}
public HttpResponseMessage PostRegisterUser(UserModel model)
{
var responseMsg = this.PerfromOperationAndHandleException(() =>
{
using (var dbContext = new AcadBlogContext())
{
this.ValidateUsername(model.Username);
this.ValidateNickname(model.Displayname);
this.ValidateAuthCode(model.AuthCode);
var usernameAsLowercase = model.Username.ToLower();
var nicknameAsLowercase = model.Displayname.ToLower();
var existingUser = dbContext.Users.FirstOrDefault(
u => u.Username == usernameAsLowercase ||
u.Displayname == nicknameAsLowercase);
if (existingUser != null)
{
throw new InvalidOperationException(
"User with the same displayname or username already exists.");
}
var newUser = new User()
{
Username = usernameAsLowercase,
Displayname = model.Displayname,
AuthCode = model.AuthCode,
};
dbContext.Users.Add(newUser);
dbContext.SaveChanges();
newUser.SessionKey = this.GenerateSessionKey(newUser.Id);
dbContext.SaveChanges();
var loggedModel = new LoggedUserModel()
{
Displayname = model.Displayname,
SessionKey = newUser.SessionKey
};
var response = this.Request.CreateResponse(HttpStatusCode.Created,
loggedModel);
return response;
};
});
return responseMsg;
}
public HttpResponseMessage PostLoginUser(UserModel model)
{
var responseMsg = this.PerfromOperationAndHandleException(() =>
{
using (var dbContext = new AcadBlogContext())
{
this.ValidateUsername(model.Username);
this.ValidateAuthCode(model.AuthCode);
var usernameAsLowercase = model.Username.ToLower();
var existingUser = dbContext.Users.FirstOrDefault(
u => u.Username == usernameAsLowercase &&
u.AuthCode == model.AuthCode);
if (existingUser == null)
{
throw new InvalidOperationException(
"Username or password is invalid.");
}
if (existingUser.SessionKey == null)
{
existingUser.SessionKey = this.GenerateSessionKey(existingUser.Id);
dbContext.SaveChanges();
}
var loggedModel = new LoggedUserModel()
{
Displayname = existingUser.Displayname,
SessionKey = existingUser.SessionKey
};
var response = this.Request.CreateResponse(HttpStatusCode.OK,
loggedModel);
return response;
};
});
return responseMsg;
}
public IQueryable<TagGetModel> GetAllTags(
[ValueProvider(typeof(HeaderValueProviderFactory<string>))] string sessionKey)
{
var responseMsg = this.PerfromOperationAndHandleException(() =>
{
var dbContext = new AcadBlogContext();
var user = this.ValidateAndGetUserBySessionKey(dbContext, sessionKey);
var tagModels = dbContext.Tags.Select(
t => new TagGetModel
{
Id = t.Id,
Name = t.Title,
Posts = t.Posts.Count
});
return tagModels.OrderByDescending(t => t.Name);
});
return responseMsg;
}
public HttpResponseMessage PutLogoutUser(
[ValueProvider(typeof(HeaderValueProviderFactory<string>))] string sessionKey)
{
var responseMsg = this.PerfromOperationAndHandleException(() =>
{
using (var dbContext = new AcadBlogContext())
{
this.ValidateSessionKey(sessionKey);
var user = dbContext.Users.FirstOrDefault(
u => u.SessionKey == sessionKey);
if (user == null)
{
throw new InvalidOperationException("Incorrect session key.");
}
user.SessionKey = null;
dbContext.SaveChanges();
var response = this.Request.CreateResponse(HttpStatusCode.OK);
return response;
}
});
return responseMsg;
}
private Post ValidateAndGetPostById(AcadBlogContext dbContext, int postId)
{
var post = dbContext.Posts.Find(postId);
if (post == null)
{
throw new ArgumentNullException(String.Format(
"Post with id {0} does not exist.", postId));
}
return post;
}
private ICollection<Tag> FindOrCreateTagsByTitle(AcadBlogContext context,
ICollection<string> tags)
{
List<Tag> tagsToReturn = new List<Tag>();
foreach (var tag in tags)
{
var existingTag = context.Tags.FirstOrDefault(t => t.Title == tag);
if (existingTag != null)
{
tagsToReturn.Add(existingTag);
}
else
{
var newTag = new Tag()
{
Title = tag
};
tagsToReturn.Add(newTag);
context.Tags.Add(newTag);
context.SaveChanges();
}
}
return tagsToReturn;
}
public HttpResponseMessage PutCommentOnAPost(
int postId, CommentPostModel model,
[ValueProvider(typeof(HeaderValueProviderFactory<string>))] string sessionKey)
{
var responseMsg = this.PerfromOperationAndHandleException(() =>
{
this.ValidateCommentPostModel(model);
using (var dbContext = new AcadBlogContext())
{
var user = this.ValidateAndGetUserBySessionKey(dbContext, sessionKey);
var post = this.ValidateAndGetPostById(dbContext, postId);
var newComment = new Comment()
{
Content = model.Text,
DateCreated = DateTime.Now,
User = user,
Post = post
};
dbContext.Comments.Add(newComment);
dbContext.SaveChanges();
var response = this.Request.CreateResponse(HttpStatusCode.OK);
return response;
}
});
return responseMsg;
}
public HttpResponseMessage PostCreatePost(PostCreateRequestModel model,
[ValueProvider(typeof(HeaderValueProviderFactory<string>))] string sessionKey)
{
var responseMsg = this.PerfromOperationAndHandleException(() =>
{
this.ValidatePostCreateModel(model);
using (var dbContext = new AcadBlogContext())
{
var user = this.ValidateAndGetUserBySessionKey(dbContext, sessionKey);
Post newPost = new Post
{
Title = model.Title,
Content = model.Text,
Tags = this.FindOrCreateTagsByTitle(dbContext, model.Tags),
PostDate = DateTime.Now,
User = user,
};
dbContext.Posts.Add(newPost);
dbContext.SaveChanges();
var responseModel = new PostCreateResponseModel()
{
Id = newPost.Id,
Title = model.Title,
};
var response = this.Request.CreateResponse(HttpStatusCode.Created,
responseModel);
return response;
}
});
return responseMsg;
}
