/// <author>Per Mortensen</author>
/// <summary>
/// Determines whether the publisher account with the supplied credentials are authorized
/// to change the media item's metadata.
/// </summary>
/// <param name="mediaId">
/// The id of the media item to be changed.
/// </param>
/// <param name="credentials">
/// The credentials of the publisher account.
/// </param>
/// <param name="db">
/// The database context to retrieve data from.
/// </param>
/// <param name="service">
/// The service on which the ValidateCredentials should be called.
/// </param>
/// <returns>
/// true if the publisher can change the media, false otherwise.
/// </returns>
public static bool IsPublisherAuthorized(int mediaId, AccountCredentials credentials, DatabaseDataContext db, RentItService service)
{
try
{
service.ValidateCredentials(credentials);
}
catch (Exception)
{
return false;
}
if (!db.Medias.Exists(m => m.id == mediaId && m.active))
return false; // if the media with the specified id was not found
Media media = (from m in db.Medias
where m.id == mediaId && m.active
select m).Single();
// find out whether this publisher is authorized to delete this media
if (db.Publisher_accounts.Exists(p => p.user_name.Equals(credentials.UserName)
&& p.publisher_id == media.publisher_id))
return true;
// if this publisher does not have permission to update the media
return false;
}
/// <author>Kenneth Søhrmann</author>
/// <summary>
/// Converts a list of media-instances from the database to an instance of
/// MediaItems with all data of the various media items submitted.
/// </summary>
/// <param name="mediaList">
/// The collection of media-instances to be converted to a MediaItems-
/// instance.
/// </param>
/// <param name="service">
/// The service on which the GetXxxInfo methods should be called.
/// </param>
/// <returns>
/// A MediaItems-instance holding all metadata of all the medias submitted.
/// </returns>
public static MediaItems CompileMedias(IQueryable<RentItDatabase.Media> mediaList, RentItService service)
{
var bookInfos = new List<BookInfo>();
var movieInfos = new List<MovieInfo>();
var songInfos = new List<SongInfo>();
var albumInfos = new List<AlbumInfo>();
foreach (RentItDatabase.Media media in mediaList)
{
switch (MediaTypeOfValue(media.Media_type.name))
{
case MediaType.Book:
bookInfos.Add(service.GetBookInfo(media.id));
break;
case MediaType.Movie:
movieInfos.Add(service.GetMovieInfo(media.id));
break;
case MediaType.Song:
songInfos.Add(GetSongInfo(media.id));
break;
case MediaType.Album:
albumInfos.Add(service.GetAlbumInfo(media.id));
break;
}
}
return new MediaItems(bookInfos, movieInfos, albumInfos, songInfos);
}
