public async Task <string> GetOriginalUrl(string shortUrl)
{
int id = 0;
char[] shortURLArr = shortUrl.ToCharArray();
// conversion from short url to id. this id will be used to retrieve the original url from database.
for (int i = 0; i < shortURLArr.Length; i++)
{
if (shortURLArr[i] >= 'a' && shortURLArr[i] <= 'z')
{
id = id * 62 + shortURLArr[i] - 'a';
}
else if (shortURLArr[i] >= 'A' && shortURLArr[i] <= 'Z')
{
id = id * 62 + shortURLArr[i] - 'A' + 26;
}
else if (shortURLArr[i] >= '0' && shortURLArr[i] <= '9')
{
id = id * 62 + shortURLArr[i] - '0' + 52;
}
}
UrlShorteningDetails urlShorteningDetails = await ShorteningRepository.GetLongUrlById(id);
return(urlShorteningDetails == null ? "Not Found" : urlShorteningDetails.LongUrl);
}
public async Task <string> GetShortUrl(string longUrl)
{
try
{
UrlShorteningDetails urlShorteningDetails = await ShorteningRepository.GetShortUrlBylongUrl(longUrl.Trim());
if (urlShorteningDetails != null)
{
return(Map62Url(urlShorteningDetails.Id));
}
else
{
//Insert Long URL in DB
urlShorteningDetails = new UrlShorteningDetails()
{
LongUrl = longUrl,
DateCreated = DateTime.Now.ToLocalTime(),
DateExpiry = DateTime.Now.Date.AddDays(30),
Active = "Y"
};
ShorteningRepository.Save(urlShorteningDetails);
return(urlShorteningDetails.Id > 0 ? Map62Url(urlShorteningDetails.Id) : throw new InvalidOperationException());
}
}
catch (Exception ex)
{
return(ex.Message);
}
}
public void Save(UrlShorteningDetails urlShorteningDetails)
{
shortnerDbContext.UrlShorteningDetails.Add(urlShorteningDetails);
shortnerDbContext.SaveChanges();
}
