/// <summary>
/// The remote URL and signature are encoded in the "file" part
/// of the virtualPath parameter as follows:
/// path/path/.../path/url_b64.hmac.ext
/// </summary>
/// <param name="virtualPath"></param>
/// <returns></returns>
public async Task <IBlobData> Fetch(string virtualPath)
{
var remote = virtualPath
.Split('/')
.Last()?
.Split('.');
if (remote == null || remote.Length < 2)
{
logger?.LogWarning("Invalid remote path: {VirtualPath}", virtualPath);
throw new BlobMissingException($"Invalid remote path: {virtualPath}");
}
var urlBase64 = remote[0];
var hmac = remote[1];
var sig = Signatures.SignString(urlBase64, options.SigningKey, 8);
if (hmac != sig)
{
logger?.LogWarning("Missing or Invalid signature on remote path: {VirtualPath}", virtualPath);
throw new BlobMissingException($"Missing or Invalid signature on remote path: {virtualPath}");
}
var url = EncodingUtils.FromBase64UToString(urlBase64);
if (!Uri.TryCreate(url, UriKind.Absolute, out var uri))
{
logger?.LogWarning("RemoteReader blob {VirtualPath} not found. Invalid Uri: {Url}", virtualPath, url);
throw new BlobMissingException($"RemoteReader blob \"{virtualPath}\" not found. Invalid Uri: {url}");
}
var httpClientName = httpClientSelector(uri);
using var http = httpFactory.CreateClient(httpClientName);
try
{
var resp = await http.GetAsync(url);
if (!resp.IsSuccessStatusCode)
{
logger?.LogWarning("RemoteReader blob {VirtualPath} not found. The remote {Url} responded with status: {StatusCode}", virtualPath, url, resp.StatusCode);
throw new BlobMissingException($"RemoteReader blob \"{virtualPath}\" not found. The remote \"{url}\" responded with status: {resp.StatusCode}");
}
return(new RemoteReaderBlob(resp));
}
catch (BlobMissingException)
{
throw;
}
catch (Exception ex)
{
logger?.LogWarning(ex, "RemoteReader blob error retrieving {Url} for {VirtualPath}.", url, virtualPath);
throw new BlobMissingException($"RemoteReader blob error retrieving \"{url}\" for \"{virtualPath}\".", ex);
}
}
/// <summary>
/// The remote URL and signature are encoded in the "file" part
/// of the virtualPath parameter as follows:
/// path/path/.../path/urlb64.hmac.ext
/// </summary>
/// <param name="virtualPath"></param>
/// <returns></returns>
public async Task <IBlobData> Fetch(string virtualPath)
{
var remote = virtualPath
.Split('/')
.Last()
.Split('.');
var urlb64 = remote[0];
var hmac = remote[1];
var sig = Signatures.SignString(urlb64, _options.SigningKey, 8);
if (hmac != sig)
{
throw new BlobMissingException($"Missing or Invalid signature on remote path: {virtualPath}");
}
var url = EncodingUtils.FromBase64UToString(urlb64);
var resp = await _http.GetAsync(url);
return(new RemoteReaderBlob(resp));
}