public LittleUrl CheckUrl(string longUrl)
{
try
{
if (!string.IsNullOrEmpty(longUrl))
{
LittleUrl retUrl = _myMongoDb.GetCollection <LittleUrl>(_mongoCollection)
.Find <LittleUrl>(url => url.LongUrl == longUrl).FirstOrDefault();
if (retUrl != null)
{
// If the Url is deleted, undelete it before returning
if (retUrl.IsDeleted)
{
retUrl = ToggleDelete(retUrl.ShortUrl, false);
}
return(retUrl);
}
}
}
catch (Exception ex)
{
throw ex;
}
return(null);
}
public void InsertUrl(LittleUrl url)
{
try
{
_myMongoDb.GetCollection <LittleUrl>(_mongoCollection).InsertOne(url);
}
catch (Exception ex)
{
throw ex;
}
return;
}
public LittleUrl GetUrl(string shortUrl, bool deleted)
{
try
{
// Call purge when a fetch operation is called
// Purge runs just once a day
if (_lastPurgeDate.AddDays(1) < DateTime.UtcNow)
{
PurgeUrls();
}
if (!string.IsNullOrEmpty(shortUrl))
{
// Find matching and undeleted URL
var query = Builders <LittleUrl> .Filter.And(
Builders <LittleUrl> .Filter.Where(url => url.ShortUrl == shortUrl),
Builders <LittleUrl> .Filter.Or(
Builders <LittleUrl> .Filter.Exists(url => url.IsDeleted, false),
Builders <LittleUrl> .Filter.Where(url => url.IsDeleted == deleted)
)
);
LittleUrl retUrl = _myMongoDb.GetCollection <LittleUrl>(_mongoCollection)
.Find <LittleUrl>(query)
.FirstOrDefault();
if (retUrl != null)
{
// Update last accessed time
TouchUrl(shortUrl);
return(retUrl);
}
}
}
catch (Exception ex)
{
throw ex;
}
return(null);
}
public LittleUrl ToggleDelete(string shortUrl, bool deleteFlag)
{
LittleUrl returnUrl = null;
try
{
DateTime purgeDate = DateTime.UtcNow.AddDays(_retentionDays);
// Logical Delete or Undelete
if (deleteFlag)
{
// Delete
var urlUpdates = Builders <LittleUrl> .Update
// Set IsDeleted = True
.Set(url => url.IsDeleted, deleteFlag)
// Set DeletedDate = Now
.Set(url => url.DeletedTime, DateTime.UtcNow)
// Set PurgeDate = 90 days out (at midnight)
.Set(url => url.PurgeDate, new DateTime(purgeDate.Year,
purgeDate.Month,
purgeDate.Day,
23,
59,
59,
999,
DateTimeKind.Utc));
// Update if found
var options = new FindOneAndUpdateOptions <LittleUrl>
{
IsUpsert = false,
ReturnDocument = ReturnDocument.After
};
returnUrl = _myMongoDb.GetCollection <LittleUrl>(_mongoCollection)
.FindOneAndUpdate <LittleUrl>(
url => url.ShortUrl == shortUrl,
urlUpdates,
options);
}
else
{
// Undelete
var urlUpdates = Builders <LittleUrl> .Update
// Set IsDeleted = False
.Set(url => url.IsDeleted, deleteFlag)
// Set DeletedDate = Reset
.Set(url => url.DeletedTime, DateTime.MinValue)
// Set PurgeDate = Reset
.Set(url => url.PurgeDate, DateTime.MinValue);
// Update if found
var options = new FindOneAndUpdateOptions <LittleUrl>
{
IsUpsert = false,
ReturnDocument = ReturnDocument.After
};
returnUrl = _myMongoDb.GetCollection <LittleUrl>(_mongoCollection)
.FindOneAndUpdate <LittleUrl>(
url => url.ShortUrl == shortUrl,
urlUpdates,
options);
}
}
catch (Exception ex)
{
throw ex;
}
return(returnUrl);
}
