// application entry point
static void Main(string[] ArgsRaw)
{
try
{
// task
ProgramTask ProgramTask = new ProgramTask(ArgsRaw);
Run(ProgramTask);
}
catch (NoArgumentsException)
{
PrintUsage();
}
catch (ArgumentsException ex)
{
Console.Error.WriteLine(ex.Message);
}
catch (Exception ex)
{
// display the entire exception stack
Exception NextEx = ex;
while (NextEx != null)
{
Console.Error.WriteLine(NextEx.GetType().FullName + ": " + NextEx.Message);
Console.Error.WriteLine(NextEx.StackTrace);
NextEx = NextEx.InnerException;
if (NextEx != null)
{
Console.Error.WriteLine();
}
}
}
}
// main application algorithm
static void Run(ProgramTask ProgramTask)
{
// get the dates
List <DateTime> Dates = new List <DateTime> ();
if (ProgramTask.dtDay != null)
{
Dates.Add(ProgramTask.dtDay.Value);
}
else // file is already assured to be specified
{
string[] DateLines;
try
{
DateLines = File.ReadAllLines(ProgramTask.DatesFilePath);
}
catch (FileNotFoundException ex)
{
throw new AppException($"Failed to read {ProgramTask.DatesFilePath}. File must be missing.", ex);
}
catch (UnauthorizedAccessException ex)
{
throw new AppException($"Failed to read {ProgramTask.DatesFilePath}. Must be privileges issue.", ex);
}
foreach (string DateLine in DateLines)
{
DateTime?Date = Utils.ReadDateTime.Try(DateLine);
if (Date != null)
{
Dates.Add(Date.Value);
}
}
}
if (Dates.Count == 0)
{
throw new AppException("No dates specified.");
}
// loading
WebClient Client = new WebClient();
int PhotosTotalCount = 0;
foreach (DateTime Date in Dates)
{
// day summary
string SummaryUrl = $"https://api.nasa.gov/mars-photos/api/v1/rovers/curiosity/photos?earth_date={Date.ToString("yyyy-MM-dd")}&api_key={ProgramTask.ApiKey}";
string SummaryJson;
try
{
SummaryJson = Client.DownloadString(SummaryUrl);
}
catch (Exception ex)
{
if (ex is WebException wex && wex.Message == "The remote server returned an error: (403) Forbidden.")
{
throw new NasaApiForbiddenException(ex);
}
throw new NasaApiException("Failed to download day photos information.", ex);
}
// deserialize
NasaApi.DaySummary DaySummary;
try
{
DaySummary = JsonConvert.DeserializeObject <NasaApi.DaySummary> (SummaryJson);
}
catch (Exception ex)
{
throw new NasaApiException("Error while deserializing day photos information. Must be ill-formatted JSON.", ex);
}
// verify length
if (ProgramTask.PhotoIndex != null && DaySummary.Photos.Length < ProgramTask.PhotoIndex.Value)
{
throw new AppException($"Photo index ({ProgramTask.PhotoIndex}) exceeds the photos count ({DaySummary.Photos.Length}).");
}
int MinIndex = 0;
int MaxIndexExcl = DaySummary.Photos.Length;
// narrow down the range for single photo
if (ProgramTask.PhotoIndex != null)
{
MinIndex = ProgramTask.PhotoIndex.Value - 1; // PhotoIndex is 1-based
MaxIndexExcl = MinIndex + 1;
}
// go through all the photos
for (int i = MinIndex; i < MaxIndexExcl; ++i)
{
NasaApi.Photo Photo = DaySummary.Photos[i];
string DirPath = Path.Combine(ProgramTask.OutputDir, Photo.EarthDate.ToString("yyyy-MM-dd"));
try
{
Directory.CreateDirectory(DirPath);
}
catch (Exception ex)
{
throw new AppException($"Failed to create directory at {DirPath}"
+ (ex is UnauthorizedAccessException ? ". Must be privileges issue." : ""),
ex);
}
// target filename
string ImageFileName = $"{Photo.Id}-{Photo.Rover.Name}-{Photo.Camera.Name}.jpg";
string FilePath = Path.Combine(DirPath, ImageFileName);
try
{
// actual downloading
Client.DownloadFile(Photo.ImageUrl, FilePath);
++PhotosTotalCount;
}
catch (Exception ex)
{
if (ex is WebException wex)
{
if (wex.Message == "The remote server returned an error: (403) Forbidden.")
{
throw new NasaApiImageException(Photo.ImageUrl, ex);
}
if (wex.InnerException.GetType() == typeof(UnauthorizedAccessException))
{
throw new AppException($"Failed to save photo at {FilePath}. Must be privileges issue.", ex);
}
}
if (ex is DirectoryNotFoundException)
{
throw new AppException($"Failed to save photo at {FilePath}", ex);
}
throw new AppException($"Failed to download photo at {Photo.ImageUrl}. Can be connection fault.", ex);
}
// open in browser
if (ProgramTask.AutoOpen)
{
Process pOpenImage = new Process();
pOpenImage.StartInfo.UseShellExecute = true;
pOpenImage.StartInfo.FileName = Photo.ImageUrl;
pOpenImage.Start();
}
}
}
if (PhotosTotalCount == 0)
{
Console.Error.WriteLine($"No photos are present for the specified date(s).");
}
}