feat: add ccapi to application samples

samples/application/ccapi/Dockerfile

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+# Use an official Golang runtime as a parent image
+FROM golang:1.21-alpine AS build
+
+ENV PATH="${PATH}:/usr/bin/"
+
+RUN apk update 
+
+RUN apk add \
+    docker \
+    openrc \
+    git \ 
+    gcc \
+    gcompat \
+    libc-dev  \
+    libc6-compat  \
+    libstdc++ && \
+    ln -s /lib/libc.so.6 /usr/lib/libresolv.so.2
+
+# Set the working directory to /rest-server
+WORKDIR /rest-server
+
+# Copy the go.mod and go.sum files for dependency management
+COPY go.mod go.sum ./
+
+# Install go dependencies
+RUN go mod download
+
+# Copy the current directory contents into the container at /rest-server
+COPY . .
+
+# Build the Go ccapi
+RUN go build -o ccapi
+
+# # Use an official Alpine runtime as a parent image
+# FROM alpine:latest
+
+# ENV PATH="${PATH}:/usr/bin/"
+
+# RUN apk update 
+
+# RUN apk add \
+#     docker \
+#     openrc \
+#     git \ 
+#     gcc \
+#     gcompat \
+#     libc-dev  \
+#     libc6-compat  \
+#     libstdc++ && \
+#     ln -s /lib/libc.so.6 /usr/lib/libresolv.so.2
+
+# # Set the working directory to /rest-server
+# WORKDIR /rest-server
+
+# Copy the ccapi binary from the build container to the current directory in the Alpine container
+RUN ls -l
+RUN pwd
+
+RUN cp ./ccapi /usr/bin/ccapi
+
+# Run the ccapi binary
+CMD ["ccapi"]

samples/application/ccapi/README.md

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+# CCAPI - A web server developed to interface with CC-tools chaincode
+
+## Motivation
+
+As continuation to the [cc-tools-demo]() tutorial on how to integrate the cc-tools project with FPC chaincodes, we start by utilizing another powerful solution offered by cc-tools which is the CCAPI. It's a complete web server that simplifies the communication with the peers and Fabric components to replace the need to deal with CLI applications.
+
+## Architecture
+
+The following diagram explains the process where we modified the API server developed for a demo on cc-tools ([CCAPI](https://github.com/hyperledger-labs/cc-tools-demo/tree/main/ccapi)) and modified it to communicate with FPC code.
+
+The transaction client invocation process, as illustrated in the diagram, consists of several key steps that require careful integration between FPC and cc-tools.
+
+1. Step 1-2: The API server is listening for requests on a specified port over an HTTP channel and sends it to the handler.
+2. Step 3: The handler starts by determining the appropriate transaction invocation based on the requested endpoint and calling the corresponding chaincode API.
+3. Step 4: The chaincode API is responsible for parsing and ensuring the payload is correctly parsed into a format that is FPC-friendly. This parsing step is crucial, as it prepares the data to meet FPC’s privacy and security requirements before it reaches the peer.
+4. Step 5: FPCUtils is the step where the actual transaction invocation happens. It follows the steps explained in [here](https://github.com/hyperledger/fabric-rfcs/blob/main/text/0000-fabric-private-chaincode-1.0.md#fpc-transaction-flow) as it builds on top of the FPC Client SDK.
+
+![CCAPIFlow](./CCAPIFlow.png)
+
+## User Experience
+
+CCAPI uses docker and docker-compose to spin up all the required components to work.
+
+Have a look at the [fpc-docker-compose.yaml](./fpc-docker-compose.yaml) to see how we use different env vars. Most of these environment variables are required by any client application to work and communicate with FPC. If you followed the [cc-tools-demo](../../chaincode/cc-tools-demo/README.md) tutorial, the values should be the same.
+
+Note: The following steps should run outside the FPC dev container
+
+Start by running:
+
+```bash
+cd $FPC_PATH/samples/application/ccapi
+docker-compose -f fpc-docker-compose.yaml up
+```
+
+then go to the browser and type `localhost:80` to open the swagger api and start executing functions.
+
+## Future work
+
+CCAPI has another component for the dashboard frontend application but it's not yet utilized with

samples/application/ccapi/chaincode/invokeFPC.go

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+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package chaincode
+
+import (
+	"net/http"
+
+	"github.com/hyperledger/fabric-private-chaincode/samples/application/ccapi/common"
+)
+
+func InvokeFpc(channelName string, chaincodeName string, txname string, args [][]byte) ([]byte, int, error) {
+	stringArgs := make([]string, len(args))
+	for i, b := range args {
+		stringArgs[i] = string(b)
+	}
+
+	client := common.NewFpcClient(channelName, chaincodeName)
+	res := client.Invoke(txname, stringArgs[0:]...)
+	return []byte(res), http.StatusOK, nil
+}

samples/application/ccapi/chaincode/invokeFPCDefault.go

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+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package chaincode
+
+import (
+	"net/http"
+
+	"github.com/hyperledger/fabric-private-chaincode/samples/application/ccapi/common"
+)
+
+func InvokeFpcDefault(txname string, args [][]byte) ([]byte, int, error) {
+	stringArgs := make([]string, len(args))
+	for i, b := range args {
+		stringArgs[i] = string(b)
+	}
+
+	client := common.NewDefaultFpcClient()
+	res := client.Invoke(txname, stringArgs[0:]...)
+	return []byte(res), http.StatusOK, nil
+}

samples/application/ccapi/chaincode/queryFPC.go

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+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package chaincode
+
+import (
+	"net/http"
+
+	"github.com/hyperledger/fabric-private-chaincode/samples/application/ccapi/common"
+)
+
+func QueryFpc(chaincodeName string, channelName string, txName string, args [][]byte) ([]byte, int, error) {
+	stringArgs := make([]string, len(args))
+	for i, b := range args {
+		stringArgs[i] = string(b)
+	}
+
+	client := common.NewFpcClient(chaincodeName, channelName)
+	res := client.Query(txName, stringArgs[0:]...)
+	return []byte(res), http.StatusOK, nil
+}

samples/application/ccapi/chaincode/queryFPCDefault.go

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+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package chaincode
+
+import (
+	"net/http"
+
+	"github.com/hyperledger/fabric-private-chaincode/samples/application/ccapi/common"
+)
+
+func QueryFpcDefault(txName string, args [][]byte) ([]byte, int, error) {
+	stringArgs := make([]string, len(args))
+	for i, b := range args {
+		stringArgs[i] = string(b)
+	}
+
+	client := common.NewDefaultFpcClient()
+	res := client.Query(txName, stringArgs[0:]...)
+	return []byte(res), http.StatusOK, nil
+}

samples/application/ccapi/common/fpc.go

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+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package common
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+
+	pkgFpc "github.com/hyperledger/fabric-private-chaincode/samples/application/ccapi/fpcUtils"
+)
+
+var (
+	defaultFpcConfig *pkgFpc.Config
+)
+
+func InitFpcConfig() {
+
+	getStrEnv := func(key string) string {
+		val := os.Getenv(key)
+		if val == "" {
+			panic(fmt.Sprintf("%s not set", key))
+		}
+		return val
+	}
+
+	getBoolEnv := func(key string) bool {
+		val := getStrEnv(key)
+		ret, err := strconv.ParseBool(val)
+		if err != nil {
+			if val == "" {
+				panic(fmt.Sprintf("invalid bool value for %s", key))
+			}
+		}
+		return ret
+	}
+
+	defaultFpcConfig = &pkgFpc.Config{
+		CorePeerAddress:         getStrEnv("CORE_PEER_ADDRESS"),
+		CorePeerId:              getStrEnv("CORE_PEER_ID"),
+		CorePeerOrgName:         getStrEnv("CORE_PEER_ORG_NAME"),
+		CorePeerLocalMSPID:      getStrEnv("CORE_PEER_LOCALMSPID"),
+		CorePeerMSPConfigPath:   getStrEnv("CORE_PEER_MSPCONFIGPATH"),
+		CorePeerTLSCertFile:     getStrEnv("CORE_PEER_TLS_CERT_FILE"),
+		CorePeerTLSEnabled:      getBoolEnv("CORE_PEER_TLS_ENABLED"),
+		CorePeerTLSKeyFile:      getStrEnv("CORE_PEER_TLS_KEY_FILE"),
+		CorePeerTLSRootCertFile: getStrEnv("CORE_PEER_TLS_ROOTCERT_FILE"),
+		OrdererCA:               getStrEnv("ORDERER_CA"),
+		ChaincodeId:             getStrEnv("CCNAME"),
+		ChannelId:               getStrEnv("CHANNEL"),
+		GatewayConfigPath:       getStrEnv("GATEWAY_CONFIG"),
+	}
+
+}
+
+func NewDefaultFpcClient() *pkgFpc.Client {
+	return pkgFpc.NewClient(defaultFpcConfig)
+}
+
+func NewFpcClient(channelName string, chaincodeName string) *pkgFpc.Client {
+	fpcConfig := defaultFpcConfig
+	fpcConfig.ChannelId = channelName
+	fpcConfig.ChaincodeId = chaincodeName
+	return pkgFpc.NewClient(fpcConfig)
+}