public async Task <E2EUser> GetUserById(string userId)
{
Guid.Parse(userId);
await SemaphoreSlim.WaitAsync();
try
{
var contact = await this.contacts.Get(userId);
Debug.Assert(contact.Id == userId);
E2EUser user = E2EUserSerializer.Deserialize(contact.CryptographicInformation);
if (user == null) // for example, when the contact has just been added
{
user = new E2EUser {
DynamicPrivateDecryptionKeys = new Dictionary <long, byte[]>()
}
}
;
user.UserId = userId;
user.StaticPublicKey = contact.StaticPublicKey;
return(user);
}
finally
{
SemaphoreSlim.Release();
}
}
public static byte[] Serialize(E2EUser u)
{
byte[] serialized = PocoSerializer.Begin()
//.Append(m.UserId) // Ignore
//.Append(m.StaticPublicKey) // Ignore
.Append(u.LatestDynamicPublicKey)
.Append(u.LatestDynamicPublicKeyId)
.Append(u.AuthSecret)
.Append(u.DynamicPrivateDecryptionKeys)
.Finish();
return(serialized);
}
public async Task UpdateUser(E2EUser user)
{
Guid.Parse(user.UserId);
await SemaphoreSlim.WaitAsync();
try
{
Identity contact = await this.contacts.Get(user.UserId);
var serialized = E2EUserSerializer.Serialize(user);
contact.CryptographicInformation = serialized;
await this.contacts.Update(contact);
}
finally
{
SemaphoreSlim.Release();
}
}
public static E2EUser Deserialize(byte[] serializedE2EUser)
{
if (serializedE2EUser == null)
{
return(null);
}
try
{
var u = new E2EUser();
var ser = PocoSerializer.GetDeserializer(serializedE2EUser);
// not setting UserId, StaticPublicKey here!
u.LatestDynamicPublicKey = ser.MakeByteArray(0);
u.LatestDynamicPublicKeyId = ser.MakeInt64(1);
u.AuthSecret = ser.MakeByteArray(2);
u.DynamicPrivateDecryptionKeys = ser.MakeDictLongByteArray(3);
return(u);
}
catch (Exception)
{
return(null);
}
}
