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Added support for changing Uri to the same file in case iold one expires.

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This commit is contained in:
Michael Bucari-Tovo 2021-07-03 17:15:35 -06:00
parent da7af895fb
commit 6efe064ca7
1 changed files with 47 additions and 21 deletions
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68
AaxDecrypter/NetworkFileStream.cs
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@ -15,13 +15,20 @@ namespace AaxDecrypter
/// </summary>
public class SingleUriCookieContainer : CookieContainer
{
public SingleUriCookieContainer(Uri uri)
{
Uri = uri;
private Uri baseAddress;
public Uri Uri
{
get => baseAddress;
set
{
baseAddress = new UriBuilder(value.Scheme, value.Host).Uri;
}
}
public Uri Uri { get; }
public CookieCollection GetCookies() => base.GetCookies(Uri);
public CookieCollection GetCookies()
{
return base.GetCookies(Uri);
}
}
/// <summary>
@ -43,7 +50,7 @@ namespace AaxDecrypter
/// Http(s) address of the file to download.
/// </summary>
[JsonProperty(Required = Required.Always)]
public Uri Uri { get; }
public Uri Uri { get; private set; }
/// <summary>
/// All cookies set by caller or by the remote server.
@ -73,7 +80,7 @@ namespace AaxDecrypter
#region Private Properties
private HttpWebRequest HttpRequest { get; }
private HttpWebRequest HttpRequest { get; set; }
private FileStream _writeFile { get; }
private FileStream _readFile { get; }
private Stream _networkStream { get; set; }
@ -118,9 +125,35 @@ namespace AaxDecrypter
Uri = uri;
WritePosition = writePosition;
RequestHeaders = requestHeaders ?? new WebHeaderCollection();
CookieContainer = cookies ?? new SingleUriCookieContainer(uri);
CookieContainer = cookies ?? new SingleUriCookieContainer { Uri = uri };
_writeFile = new FileStream(SaveFilePath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite)
{
Position = WritePosition
};
HttpRequest = WebRequest.CreateHttp(uri);
_readFile = new FileStream(SaveFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
SetUriForSameFile(uri);
}
#endregion
/// <summary>
/// Set a different <see cref="System.Uri"/> to the same file targeted by this instance of <see cref="NetworkFileStream"/>
/// </summary>
/// <param name="uriToSameFile">New <see cref="System.Uri"/> host must match existing host.</param>
public void SetUriForSameFile(Uri uriToSameFile)
{
ArgumentValidator.EnsureNotNullOrWhiteSpace(uriToSameFile?.AbsoluteUri, nameof(uriToSameFile));
if (uriToSameFile.Host != Uri.Host)
throw new ArgumentException($"New uri to the same file must have the same host.\r\n Old Host :{Uri.Host}\r\nNew Host: {uriToSameFile.Host}");
if (hasBegunDownloading && !finishedDownloading)
throw new Exception("Cannot change Uri during a download operation.");
Uri = uriToSameFile;
HttpRequest = WebRequest.CreateHttp(Uri);
HttpRequest.CookieContainer = CookieContainer;
HttpRequest.Headers = RequestHeaders;
@ -128,16 +161,8 @@ namespace AaxDecrypter
HttpRequest.Headers.Remove("Range");
HttpRequest.AddRange(WritePosition);
_writeFile = new FileStream(SaveFilePath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite)
{
Position = WritePosition
};
_readFile = new FileStream(SaveFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
}
#endregion
#region Downloader
/// <summary>
@ -152,7 +177,7 @@ namespace AaxDecrypter
/// <summary>
/// Begins downloading <see cref="Uri"/> to <see cref="SaveFilePath"/> in a background thread.
/// </summary>
public async Task BeginDownloading()
private void BeginDownloading()
{
if (ContentLength != 0 && WritePosition == ContentLength)
{
@ -164,7 +189,7 @@ namespace AaxDecrypter
if (ContentLength != 0 && WritePosition > ContentLength)
throw new Exception($"Specified write position (0x{WritePosition:X10}) is larger than the file size.");
var response = await HttpRequest.GetResponseAsync() as HttpWebResponse;
var response = HttpRequest.GetResponse() as HttpWebResponse;
if (response.StatusCode != HttpStatusCode.PartialContent)
throw new Exception($"Server at {Uri.Host} responded with unexpected status code: {response.StatusCode}.");
@ -249,8 +274,9 @@ namespace AaxDecrypter
{
var jObj = JObject.Load(reader);
var result = new SingleUriCookieContainer(new Uri(jObj["Uri"].Value<string>()))
var result = new SingleUriCookieContainer()
{
Uri = new Uri(jObj["Uri"].Value<string>()),
Capacity = jObj["Capacity"].Value<int>(),
MaxCookieSize = jObj["MaxCookieSize"].Value<int>(),
PerDomainCapacity = jObj["PerDomainCapacity"].Value<int>()
@ -360,7 +386,7 @@ namespace AaxDecrypter
public override int Read(byte[] buffer, int offset, int count)
{
if (!hasBegunDownloading)
throw new Exception($"Must call {nameof(BeginDownloading)} before attempting to read {nameof(NetworkFileStream)};");
BeginDownloading();
long toRead = Math.Min(count, Length - Position);
long requiredPosition = Position + toRead;