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Scatter C# library to interact with ScatterDesktop/ScatterMobile
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README.md

scatter-sharp

Scatter C# library to interact with ScatterDesktop / ScatterMobile

Clone repo

git clone https://github.com/GetScatter/scatter-sharp --recursive

Prerequisite to build

Visual Studio 2017+

Instalation

scatter-sharp is now available throught nuget https://www.nuget.org/packages/scatter-sharp

Install-Package scatter-sharp

Usage

Configuration

In order to use scatter you need to create a instance with AppName and a Network configuration, connect to scatter application, request a Identity and then fetch a new Eos instance.

Example:

var network = new Api.Network()
{
    blockchain = Scatter.Blockchains.EOSIO,
    host = "api.eossweden.se",
    port = 443,
    protocol = "https",
    chainId = "aca376f206b8fc25a6ed44dbdc66547c36c6c33e3a119ffbeaef943642f0e906"
};

var scatter = new Scatter(new ScatterConfigurator()
{
   AppName = "SCATTER-SHARP",
   Network = network,
   StorageProvider = storageProvider
});

await scatter.Connect();

var identity = await scatter.GetIdentity(new Api.IdentityRequiredFields()
{
    accounts = new List<Api.Network>()
    {
        network
    },
    location = new List<Api.LocationFields>(),
    personal = new List<Api.PersonalFields>()
});

var eos = new Eos(new EosSharp.Core.EosConfigurator() {
    ChainId = network.chainId,
    HttpEndpoint = network.GetHttpEndpoint(),
    SignProvider = new ScatterSignatureProvider(scatter)
});

var account = scatter.Identity.accounts.First();

var result = await eos.CreateTransaction(new EosSharp.Core.Api.v1.Transaction()
{
    actions = new List<EosSharp.Core.Api.v1.Action>()
    {
        new EosSharp.Core.Api.v1.Action()
        {
            account = "eosio.token",
            authorization =  new List<PermissionLevel>()
            {
                new PermissionLevel() {actor = account.name, permission = account.authority }
            },
            name = "transfer",
			//Using a dictionary with key, object works on WEBGL
            data = new Dictionary<string, object>()
            {
                { "from", account.name },
                { "to", "eosio" },
                { "quantity", "0.0001 EOS" },
                { "memo", "Unity3D hello crypto world!" }
            }
        }
    }
});

... **Use all eos api methods as usual from eos-sharp** ...

scatter.Dispose();

App Storage Provider

Scatter uses a appKey and Nonce to help pair your application with the users permissions. By default this information is stored on memory but you may want to save on disk to be reused later.

Create a new Scatter instance and configure a FileStorageProvider with the target filePath.

var fileStorage = new FileStorageProvider(filePath);

using (var scatter = new Scatter(new ScatterConfigurator()
{
   AppName = "SCATTER-SHARP",
   Network = network,
   StorageProvider = fileStorage
})
{
    await scatter.Connect();
    ....    
}

Generic / Fiddler proxy

Is useful to configure a proxy to investigate and debug all the information that goes through scatter-sharp <-> ScatterDesktop. Fiddler is a popular http/websocket proxy solution but you can configure any other.

Enabling proxy

Add a proxy object to scatter configurator that accepts Url and optionaly User and Password. Note that this is used in websocket-sharp and not the implementation for WebGL (not needed).

var scatter = new Scatter(new ScatterConfigurator()
{
   AppName = "SCATTER-SHARP",
   Network = network,
   StorageProvider = storageProvider,
   Proxy = new Proxy()
   {
       Url = "http://127.0.0.1:8888"
   }
});
Fiddler unmask websocket traffic

On tab "FiddlerScript" add this code in the end of function "OnBeforeRequest"

static function OnBeforeRequest(oSession: Session) {
...
	if (oSession.RequestHeaders.ExistsAndContains ("Sec-WebSocket-Extensions", "permessage-deflate")) {
	    oSession.RequestHeaders.Remove ( "Sec-WebSocket-Extensions");
	}
}
Fiddler check websocket traffic

Double click "ws" icon to open websocket tab

alt text

In websocket tab you can view in real-time all the communication between scatter-sharp <-> ScatterDesktop

alt text

Scatter Api methods

  • Connect Connect to scatter
await scatter.Connect();
  • GetVersion Gets the Scatter version
string version = await scatter.GetVersion();
  • GetIdentity Prompts the users for an Identity if there is no permission, otherwise returns the permission without a prompt based on origin.
Identity identity = await scatter.GetIdentity(new Api.IdentityRequiredFields() {
    accounts = new List<Api.Network>()
    {
        network
    },
    location = new List<Api.LocationFields>(),
    personal = new List<Api.PersonalFields>()
});

Returns:

public class Identity
{
    public string hash;
    public string publicKey;
    public string name;
    public bool kyc;
    public List<IdentityAccount> accounts;
}
  • GetIdentityFromPermissions Checks if an Identity has permissions and return the identity based on origin.
Identity identity = await scatter.GetIdentityFromPermissions();

Returns:

public class Identity
{
    public string hash;
    public string publicKey;
    public string name;
    public bool kyc;
    public List<IdentityAccount> accounts;
}
  • ForgetIdentity Removes the identity permission for an origin from the user's Scatter, effectively logging them out.
bool result = await scatter.ForgetIdentity();
  • Authenticate Sign origin (appName) with the Identity's private key. Or custom data with custom publicKey
string signature = await scatter.Authenticate();
  • GetArbitrarySignature Request arbitrary data with the constraint of max 12 words
string signature = await scatter.GetArbitrarySignature(string publicKey, string data, string whatfor = "", bool isHash = false);
  • GetPublicKey Allows apps to request that the user provide a user-selected Public Key to the app. ( ONBOARDING HELPER )
string pubKey = await scatter.GetPublicKey(string blockchain);
  • LinkAccount Allows the app to suggest that the user link new accounts on top of public keys ( ONBOARDING HELPER )
bool result = await scatter.LinkAccount(string publicKey);
  • HasAccountFor Allows dapps to see if a user has an account for a specific blockchain. DOES NOT PROMPT and does not return an actual account, just a boolean.
bool result = await scatter.HasAccountFor();
  • SuggestNetwork Prompts the user to add a new network to their Scatter.
bool result = await scatter.SuggestNetwork();
  • AddToken Add token to wallet
bool result = await scatter.AddToken(Token token);
  • On Register listener for scatter event type
scatter.On(string type, Action<object> callback);
  • Off Remove listeners
scatter.Off(string type);
scatter.Off(string type, int index);
scatter.Off(Action<object> callback);
scatter.Off(string type, Action<object> callback);
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