[FAB-11679] Prover: RedeemRequest

- Add proto messages for redeem to prover and token transaction
- Add RequestRedeem method to prover.go
- Update transactor local interface
- Unit tests with mocked transactor

Change-Id: I1ea77d4b48af2152cc546720c21f7d61fe388fa3
Signed-off-by: Wenjian Qiao <wenjianq@gmail.com>

Author: wenjianqiao

protos/token/prover.pb.go

@@ -76,6 +76,19 @@ message TransferRequest {
     repeated RecipientTransferShare shares = 3;
 }
 
+// RedeemRequest is used to request token redemption
+message RedeemRequest {
+    // Credential contains information for the party who is requesting the operation
+    // The content of this field depends on the characteristic of token manager system
+    bytes credential = 1;
+
+    // token_ids specifies the ids for the tokens that will be redeemed
+    repeated bytes token_ids = 2;
+
+    // quantity refers to the number of units of a given token needs to be redeemed.
+    uint64 quantity_to_redeem = 3;
+}
+
 // Header is a generic replay prevention and identity message to include in a signed command
 message Header {
     // Timestamp is the local time when the message was created
@@ -105,6 +118,7 @@ message Command {
         ImportRequest import_request = 2;
         TransferRequest transfer_request = 3;
         ListRequest list_request = 4;
+        RedeemRequest redeem_request = 5;
     }
 }
 

protos/token/prover.proto

@@ -67,6 +67,8 @@ message PlainTokenAction {
         PlainImport plain_import = 1;
         // A plaintext token transfer transaction
         PlainTransfer plain_transfer = 2;
+        // A plaintext token redeem transaction
+        PlainTransfer plain_redeem = 3;
     }
 }