static public byte[] DefaultGetBlobWithSHA256(byte[] sha256)
{
var sha256DirectoryName = "by-sha256";
var fileName = BitConverter.ToString(sha256).Replace("-", "").ToUpperInvariant();
var cacheFilePath = Path.Combine(cacheDirectory, sha256DirectoryName, fileName);
bool blobHasExpectedSHA256(byte[] blobCandidate) =>
Enumerable.SequenceEqual(CommonConversion.HashSHA256(blobCandidate), sha256);
try
{
var fromCache = File.ReadAllBytes(cacheFilePath);
if (blobHasExpectedSHA256(fromCache))
{
return(fromCache);
}
}
catch
{ }
var url = containerUrl + "/" + sha256DirectoryName + "/" + fileName;
var handler = new HttpClientHandler()
{
AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip
};
using (var httpClient = new HttpClient(handler))
{
httpClient.Timeout = TimeSpan.FromMinutes(4);
httpClient.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("gzip"));
httpClient.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("deflate"));
var response = httpClient.GetAsync(url).Result;
var responseContent = response.Content.ReadAsByteArrayAsync().Result;
if (!blobHasExpectedSHA256(responseContent))
{
throw new NotImplementedException("Received unexpected blob for '" + fileName + "'.");
}
Directory.CreateDirectory(Path.GetDirectoryName(cacheFilePath));
File.WriteAllBytes(cacheFilePath, responseContent);
return(responseContent);
}
}
static public byte[] GetBlobWithSHA256(byte[] sha256)
{
var getter = OverrideGetBlobWithSHA256?.Invoke(DefaultGetBlobWithSHA256) ?? DefaultGetBlobWithSHA256;
var blobCandidate = getter(sha256);
if (!Enumerable.SequenceEqual(CommonConversion.HashSHA256(blobCandidate), sha256))
{
return(null);
}
return(blobCandidate);
}
static public byte[] DefaultGetBlobWithSHA256(byte[] sha256)
{
var sha256DirectoryName = "by-sha256";
var fileName = BitConverter.ToString(sha256).Replace("-", "").ToLowerInvariant();
var cacheFilePath = Path.Combine(cacheDirectory, sha256DirectoryName, fileName);
bool blobHasExpectedSHA256(byte[] blobCandidate) =>
Enumerable.SequenceEqual(CommonConversion.HashSHA256(blobCandidate), sha256);
try
{
var fromCache = File.ReadAllBytes(cacheFilePath);
if (blobHasExpectedSHA256(fromCache))
{
return(fromCache);
}
}
catch
{ }
string url(bool useUppercaseForHash) =>
containerUrl + "/" + sha256DirectoryName + "/" +
(useUppercaseForHash ? fileName.ToUpperInvariant() : fileName);
var handler = new HttpClientHandler()
{
AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip
};
byte[] continueForHttpResponse(HttpResponseMessage httpResponse)
{
if (!httpResponse.IsSuccessStatusCode)
{
throw new Exception(
"unexpected HTTP response status code: " + (int)httpResponse.StatusCode + " (" +
httpResponse.StatusCode + ") ('" + httpResponse.Content.ReadAsStringAsync().Result + "')");
}
var responseContent = httpResponse.Content.ReadAsByteArrayAsync().Result;
if (!blobHasExpectedSHA256(responseContent))
{
throw new NotImplementedException("Received unexpected blob for '" + fileName + "'.");
}
Directory.CreateDirectory(Path.GetDirectoryName(cacheFilePath));
File.WriteAllBytes(cacheFilePath, responseContent);
return(responseContent);
}
using (var httpClient = new HttpClient(handler))
{
httpClient.Timeout = TimeSpan.FromMinutes(4);
httpClient.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("gzip"));
httpClient.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("deflate"));
var httpResponse = httpClient.GetAsync(url(false)).Result;
if (httpResponse.StatusCode == HttpStatusCode.NotFound)
{
// 2020-05-01 Maintain backward compatibility for now: Try for the file name using uppercase letters.
try
{
return(continueForHttpResponse(httpClient.GetAsync(url(true)).Result));
}
catch { }
}
return(continueForHttpResponse(httpResponse));
}
}
