public User Register(User user, string password)
{
var pair = PasswordHash(password);
user.Password = pair.Item1;
user.Salt = pair.Item2;
context.Add(user);
context.SaveChanges();
return(user);
}
public void ReadAllAndStore()
{
List <NewsSource> newsSources = context.NewsSources.ToList();
//databaseCtx.NewsArticles.RemoveRange(databaseCtx.NewsArticles);
List <NewsArticle> newsArticles = new List <NewsArticle>();
// read from all sources
for (int i = 0; i < newsSources.Count; i++)
{
try
{
NewsSource source = newsSources[i];
List <NewsArticle> articles = Read(source);
newsArticles.AddRange(articles);
}
catch (Exception)
{
Console.WriteLine("Cannot read from source" + newsSources[i].Name);
}
}
// last group number
int lastGroup = context.NewsArticles.Select(x => (int?)x.Group).Max() ?? 0;
for (int rep = 0; rep < 31; rep++) // 32 is number of bits of the SimHash fingerprint
{
// sort
newsArticles.Sort((x, y) => x.SimHash.CompareTo(y.SimHash));
// search for possible groups
for (int i = 1; i < newsArticles.Count; i++)
{
var previous = newsArticles[i - 1];
var current = newsArticles[i];
if (HammingDistance(previous.SimHash, current.SimHash) <= 3)
{
if (previous.Group == 0)
{
previous.Group = current.Group = ++lastGroup;
}
else
{
current.Group = previous.Group;
}
}
}
// rotate
foreach (var article in newsArticles)
{
article.SimHash = RotateLeft(article.SimHash, 1);
}
}
context.AddRange(newsArticles);
context.SaveChanges();
Console.WriteLine("News read from " + newsSources.Count.ToString() + " sources");
}
public IActionResult SetNewsPreferences([FromBody] int[] newsSourceIds)
{
int userId = GetUserId();
List <NewsSource> newNewsSources = database.NewsSources.Where(n => newsSourceIds.Contains(n.Id)).ToList();
var userPreferences = database.UserPreferences.Find(userId);
if (userPreferences == null)
{
userPreferences = new UserPreference {
UserId = userId, NewsSources = newNewsSources
};
}
else
{
database.UserPreferences.Remove(userPreferences);
database.SaveChanges();
}
userPreferences = new UserPreference {
UserId = userId, NewsSources = newNewsSources
};
database.UserPreferences.Add(userPreferences);
database.SaveChanges();
return(Ok());
}
public IActionResult AddSource([FromBody] NewsSource source)
{
database.NewsSources.Add(source);
database.SaveChanges();
return(Ok());
}
