public void Download(GrabberInfo info, DateTime dt)
{
DateTime = dt;
using WebClient client = new WebClient();
try
{
Bytes = client.DownloadData(info.ImageUrl);
if (Bytes is null || Bytes.Length == 0)
{
throw new WebException("Image URL contains no data");
}
if (Bytes[0] == '<')
{
throw new WebException("Image URL contains HTML (not an image)");
}
using MemoryStream msIn = new MemoryStream(Bytes);
using Image originalImage = Bitmap.FromStream(msIn);
ImageWidth = originalImage.Width;
ImageHeight = originalImage.Height;
string timestamp = $"{dt.Year:D2}.{dt.Month:D2}.{dt.Day:D2}.{dt.Hour:D2}.{dt.Minute:D2}.{dt.Second:D2}";
Filename = $"{info.ID} {timestamp} {ImageWidth}x{ImageHeight} " + Path.GetExtension(info.ImageUrl);
Hash = GetHash(Bytes);
Response = "success";
}
catch (WebException ex)
{
Response = ex.Message;
}
}
/// <summary>
/// Try to parse a CSV line and return a grabber (or null if it cannot be parsed)
/// </summary>
private static Grabber GrabberFromCsvLine(string line)
{
line = line.Trim();
if (line.StartsWith("#"))
{
return(null);
}
string[] parts = new Regex(",(?=(?:[^\"]*\"[^\"]*\")*(?![^\"]*\"))").Split(line);
parts = parts.Select(s => s.Trim(new char[] { '\'', '"', ' ' })).ToArray();
if (parts.Length != 7)
{
return(null);
}
var info = new GrabberInfo()
{
ID = parts[0],
Callsign = parts[1],
Title = parts[2],
Name = parts[3],
Location = parts[4],
SiteUrl = parts[5],
ImageUrl = parts[6],
};
return(new Grabber(info));
}
public static Grabber[] GrabbersFromJson(string json)
{
const string EXPECTED_VERSION = "1.0";
using JsonDocument document = JsonDocument.Parse(json);
string version = document.RootElement.GetProperty("version").GetString();
if (version != EXPECTED_VERSION)
{
throw new InvalidOperationException("invalid JSON version");
}
List <Grabber> grabbers = new List <Grabber>();
foreach (var grabber in document.RootElement.GetProperty("grabbers").EnumerateObject())
{
GrabberInfo info = new GrabberInfo()
{
ID = grabber.Value.GetProperty("id").GetString(),
Name = grabber.Value.GetProperty("name").GetString(),
Callsign = grabber.Value.GetProperty("callsign").GetString(),
Location = grabber.Value.GetProperty("location").GetString(),
ImageUrl = grabber.Value.GetProperty("imageUrl").GetString(),
SiteUrl = grabber.Value.GetProperty("siteUrl").GetString(),
};
GrabberHistory history = new GrabberHistory()
{
LastUniqueHash = grabber.Value.GetProperty("lastUniqueHash").GetString(),
LastUniqueDateTime = grabber.Value.GetProperty("lastUniqueDateTime").GetDateTime(),
LastUniqueAgeMinutes = grabber.Value.GetProperty("lastUniqueAgeMinutes").GetInt32(),
URLs = grabber.Value.GetProperty("urls").EnumerateArray().Select(x => x.GetString()).ToArray()
};
grabbers.Add(new Grabber(info, history));
}
return(grabbers.ToArray());
}
public Grabber(GrabberInfo info = null, GrabberHistory history = null)
{
Info = info ?? new GrabberInfo();
History = history ?? new GrabberHistory();
Data = new GrabberData();
}