/// <summary>
/// Saves the information required to send this channel messages to the blob store,
/// and returns the URL to share with senders.
/// </summary>
/// <param name="endpoint">The endpoint for which an address book entry should be created and published.</param>
/// <param name="cancellationToken">A cancellation token to abort the publish.</param>
/// <returns>A task whose result is the absolute URI to the address book entry.</returns>
public async Task<Uri> PublishAddressBookEntryAsync(OwnEndpoint endpoint, CancellationToken cancellationToken = default(CancellationToken)) {
Requires.NotNull(endpoint, "endpoint");
var abe = endpoint.CreateAddressBookEntry(this.CryptoProvider);
var abeWriter = new StringWriter();
await Utilities.SerializeDataContractAsBase64Async(abeWriter, abe);
var ms = new MemoryStream(Encoding.UTF8.GetBytes(abeWriter.ToString()));
var location = await this.CloudBlobStorage.UploadMessageAsync(ms, DateTime.MaxValue, AddressBookEntry.ContentType, cancellationToken: cancellationToken);
if (this.UrlShortener != null) {
location = await this.UrlShortener.ShortenAsync(location);
}
var fullLocationWithFragment = new Uri(
location,
"#" + this.CryptoProvider.CreateWebSafeBase64Thumbprint(endpoint.PublicEndpoint.SigningKeyPublicMaterial));
return fullLocationWithFragment;
}
/// <summary>
/// Saves the information required to send this channel messages to the blob store,
/// and returns the URL to share with senders.
/// </summary>
/// <param name="endpoint">The endpoint for which an address book entry should be created and published.</param>
/// <param name="cancellationToken">A cancellation token to abort the publish.</param>
/// <returns>A task whose result is the absolute URI to the address book entry.</returns>
public async Task <Uri> PublishAddressBookEntryAsync(OwnEndpoint endpoint, CancellationToken cancellationToken = default(CancellationToken))
{
Requires.NotNull(endpoint, "endpoint");
var abe = endpoint.CreateAddressBookEntry(this.CryptoProvider);
var abeWriter = new StringWriter();
await Utilities.SerializeDataContractAsBase64Async(abeWriter, abe);
var ms = new MemoryStream(Encoding.UTF8.GetBytes(abeWriter.ToString()));
var location = await this.CloudBlobStorage.UploadMessageAsync(ms, DateTime.MaxValue, AddressBookEntry.ContentType, cancellationToken : cancellationToken);
if (this.UrlShortener != null)
{
location = await this.UrlShortener.ShortenAsync(location);
}
var fullLocationWithFragment = new Uri(
location,
"#" + this.CryptoProvider.CreateWebSafeBase64Thumbprint(endpoint.PublicEndpoint.SigningKeyPublicMaterial));
return(fullLocationWithFragment);
}
/// <summary>
/// Generates a new receiving endpoint.
/// </summary>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// The newly generated endpoint.
/// </returns>
/// <remarks>
/// Depending on the length of the keys set in the provider and the amount of buffered entropy in the operating system,
/// this method can take an extended period (several seconds) to complete.
/// </remarks>
private OwnEndpoint CreateEndpointWithKeys(CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
var encryptionKey = CryptoSettings.EncryptionAlgorithm.CreateKeyPair(this.CryptoProvider.AsymmetricKeySize);
cancellationToken.ThrowIfCancellationRequested();
var signingKey = CryptoSettings.SigningAlgorithm.CreateKeyPair(this.CryptoProvider.AsymmetricKeySize);
var ownContact = new OwnEndpoint(signingKey, encryptionKey);
return ownContact;
}
private Task SetEndpointAsync(OwnEndpoint endpoint, Uri addressBookEntry, CancellationToken cancellationToken = default(CancellationToken))
{
this.Channel.Endpoint = endpoint;
this.PublicEndpointUrlTextBlock.Text = addressBookEntry.AbsoluteUri;
this.OpenChatroom.IsEnabled = true;
this.ChatWithAuthor.IsEnabled = true;
return Task.FromResult<object>(null);
}
private async Task SetEndpointAsync(OwnEndpoint endpoint, Uri addressBookEntry, CancellationToken cancellationToken = default(CancellationToken)) {
this.Channel.Endpoint = endpoint;
this.PublicEndpointUrlTextBlock.Text = addressBookEntry.AbsoluteUri;
this.OpenChatroom.IsEnabled = true;
}
/// <summary>
/// Generates a new receiving endpoint.
/// </summary>
/// <returns>The newly generated endpoint.</returns>
/// <remarks>
/// Depending on the length of the keys set in the provider and the amount of buffered entropy in the operating system,
/// this method can take an extended period (several seconds) to complete.
/// </remarks>
private OwnEndpoint CreateEndpointWithKeys() {
byte[] privateEncryptionKey, publicEncryptionKey;
byte[] privateSigningKey, publicSigningKey;
this.CryptoProvider.GenerateEncryptionKeyPair(out privateEncryptionKey, out publicEncryptionKey);
this.CryptoProvider.GenerateSigningKeyPair(out privateSigningKey, out publicSigningKey);
var contact = new Endpoint() {
EncryptionKeyPublicMaterial = publicEncryptionKey,
SigningKeyPublicMaterial = publicSigningKey,
};
var ownContact = new OwnEndpoint(contact, privateSigningKey, privateEncryptionKey);
return ownContact;
}
