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using System.IO;
using System.Reflection;
using System.Threading.Tasks;
using VersOne.Epub.Environment;
using VersOne.Epub.Options;
namespace VersOne.Epub.Internal
{
internal class EpubRemoteContentLoader : EpubContentLoader
{
private readonly ContentDownloaderOptions contentDownloaderOptions;
private readonly IContentDownloader contentDownloader;
private readonly string userAgent;
public EpubRemoteContentLoader(IEnvironmentDependencies environmentDependencies, ContentDownloaderOptions? contentDownloaderOptions = null)
: base(environmentDependencies)
{
this.contentDownloaderOptions = contentDownloaderOptions ?? new ContentDownloaderOptions();
contentDownloader = this.contentDownloaderOptions.CustomContentDownloader ?? EnvironmentDependencies.ContentDownloader;
userAgent = this.contentDownloaderOptions.DownloaderUserAgent ??
"EpubReader/" + typeof(EpubRemoteContentLoader).GetTypeInfo().Assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>().InformationalVersion;
}
public override async Task<byte[]> LoadContentAsBytesAsync(EpubContentFileRefMetadata contentFileRefMetadata)
{
using Stream contentStream = await GetContentStreamAsync(contentFileRefMetadata);
using MemoryStream memoryStream = new();
await contentStream.CopyToAsync(memoryStream).ConfigureAwait(false);
return memoryStream.ToArray();
}
public override async Task<string> LoadContentAsTextAsync(EpubContentFileRefMetadata contentFileRefMetadata)
{
using Stream contentStream = await GetContentStreamAsync(contentFileRefMetadata);
using StreamReader streamReader = new(contentStream);
return await streamReader.ReadToEndAsync().ConfigureAwait(false);
}
public override Task<Stream> GetContentStreamAsync(EpubContentFileRefMetadata contentFileRefMetadata)
{
if (!contentDownloaderOptions.DownloadContent)
{
throw new EpubContentDownloaderException("Downloading remote content is prohibited by the ContentDownloaderOptions.DownloadContent option.", contentFileRefMetadata.Key);
}
return contentDownloader.DownloadAsync(contentFileRefMetadata.Key, userAgent);
}
}
}
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