Add confidential inputs to spell cmd (#230)

* Add confidential inputs to spell cmd

* Fix

cmd/geth/spellcmd/README.md

@@ -0,0 +1,27 @@
+# Spell command
+
+## Deploy a contract
+
+To deploy a contract, you need to be in the root of a Forge project that contains the built artifacts and run:
+
+```bash
+$ suave-geth spell deploy [--artifacts out] <solidity-file>:<contract-name>
+```
+
+Example:
+
+```bash
+$ suave-geth spell deploy MyContract.sol:MyContract
+```
+
+## Send a confidential compute request
+
+```bash
+$ suave-geth spell conf-request [--confidential-input <input>] <contract-addr> '<function signature>' ['(arg1,arg2)']
+```
+
+Example:
+
+```bash
+$ suave-geth spell conf-request 0x1234567890abcdef1234567890abcdef12345678 'set(uint256)' '(42)'
+```

cmd/geth/spellcmd/spellcmd.go

@@ -49,6 +49,10 @@ var (
 		Usage: "The directory where the contract artifacts are located",
 		Value: "out",
 	}
+	confidentialInput = &cli.StringFlag{
+		Name:  "confidential-input",
+		Usage: "The confidential input to use for the confidential request",
+	}
 )
 
 var (
@@ -124,6 +128,7 @@ var (
 			privateKeyFlag,
 			rpcFlag,
 			artifactsDirFlag,
+			confidentialInput,
 		},
 		Action: func(ctx *cli.Context) error {
 			args := ctx.Args().Slice()
@@ -136,6 +141,14 @@ var (
 				return err
 			}
 
+			var confInput []byte
+			if input := ctx.String(confidentialInput.Name); input != "" {
+				confInput = []byte(input)
+				log.Info("Confidential input provided", "input", confInput)
+			} else {
+				log.Info("No confidential input provided, using empty string")
+			}
+
 			var contractAddr common.Address
 			if err := contractAddr.UnmarshalText([]byte(args[0])); err != nil {
 				return err
@@ -153,13 +166,35 @@ var (
 				return fmt.Errorf("failed to parse method signature: %w", err)
 			}
 
-			calldata, err := method.Encode([]interface{}{})
+			var methodArgs []interface{}
+			if len(args) == 3 {
+				// arguments are passed as an array of items '(0x000,1,2)'
+				methodArgsStr := args[2]
+
+				// verify it has brackets and remove them
+				if !strings.HasPrefix(methodArgsStr, "(") {
+					return fmt.Errorf("expected method arguments to start with '('")
+				}
+				if !strings.HasSuffix(methodArgsStr, ")") {
+					return fmt.Errorf("expected method arguments to end with ')'")
+				}
+
+				methodArgsStr = methodArgsStr[1 : len(methodArgsStr)-1]
+				parts := strings.Split(methodArgsStr, ",")
+
+				for _, part := range parts {
+					methodArgs = append(methodArgs, strings.TrimSpace(part))
+				}
+			}
+
+			calldata, err := method.Encode(methodArgs)
 			if err != nil {
 				return err
 			}
 
 			log.Info("Sending offchain confidential compute request", "kettle", clt.KettleAddress().String())
-			hash, err := sendConfRequest(clt, devchainKettleAddress, contractAddr, calldata, nil)
+
+			hash, err := sendConfRequest(clt, devchainKettleAddress, contractAddr, calldata, confInput)
 			if err != nil {
 				return err
 			}