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messageMngm.go
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259 lines (223 loc) · 9.15 KB
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package main
import (
"encoding/json"
"fmt"
"github.com/hyperledger/fabric/core/chaincode/shim"
"strconv"
"strings"
"time"
pb "github.com/hyperledger/fabric/protos/peer"
)
// ============================================================
// saveMessage - save Message into chaincode state
// ============================================================
func (t *ChatChaincode) saveMessage(stub shim.ChaincodeStubInterface, args []string) pb.Response {
var err error
type messageTransientInput struct {
Receiver string `json:"receiver"` //the fieldtags are needed to keep case from bouncing around
Sender string `json:"sender"`
Context string `json:"context"`
}
// ==== Input sanitation ====
fmt.Println("- start to save message")
if len(args) != 0 {
return shim.Error("Incorrect number of arguments. Message must be passed in transient map.")
}
// ==== Get transient ====
transMap, err := stub.GetTransient()
if err != nil {
return shim.Error("Error getting transient: " + err.Error())
}
// ==== Check transient ====
if _, ok := transMap["message"]; !ok {
return shim.Error("message must be a key in the transient map")
}
if len(transMap["message"]) == 0 {
return shim.Error("message value in the transient map must be a non-empty JSON string")
}
// ==== Decode transient and Check value ====
var messageInput messageTransientInput
err = json.Unmarshal(transMap["message"], &messageInput)
fmt.Println("messageInput", messageInput)
if len(messageInput.Sender) == 0 {
return shim.Error("'from' field must be a non-empty string")
}
if len(messageInput.Receiver) == 0 {
return shim.Error("'to' field must be a non-empty string")
}
if len(messageInput.Context) == 0 {
return shim.Error("'context' field must be a non-empty string")
}
// ==== Check if message already exists ====
// TODO: may check Receiver, Sender, Context and SysTime
// ==== Create message object, marshal to JSON====
type messageNoEncrypt struct {
ObjectType string `json:"docType"` //docType is used to distinguish the various types of objects in state database
Receiver string `json:"receiver"` //the fieldtags are needed to keep case from bouncing around
Sender string `json:"sender"`
Context string `json:"context"`
Date string `json:"date"`
}
message := &messageNoEncrypt{
ObjectType: "message",
Receiver: messageInput.Receiver,
Sender: messageInput.Sender,
Context: messageInput.Context,
Date: time.Now().Format("2006-01-02 15:04:05"),
}
messageJSONasBytes, err := json.Marshal(message)
if err != nil {
return shim.Error(err.Error())
}
// ==== Save message to state ====
timeStampStr := strconv.FormatInt(time.Now().UnixNano(),10)
err = stub.PutPrivateData("collectionMessages", timeStampStr, messageJSONasBytes)
if err != nil {
return shim.Error(err.Error())
}
// ==== Message saved. Return success ====
fmt.Println("- end save message")
return shim.Success(nil)
}
// ============================================================
// saveMessageWithPriKey - save Encrypted Message into chaincode state
// ============================================================
func (t *ChatChaincode) saveMessageUsePubKey(stub shim.ChaincodeStubInterface, args []string) pb.Response {
var err error
var jsonResp string
// ==== Input sanitation ====
fmt.Println("- start to save message")
if len(args) != 0 {
return shim.Error("Incorrect number of arguments. Message must be passed in transient map.")
}
// ==== Get transient ====
transMap, err := stub.GetTransient()
if err != nil {
return shim.Error("Error getting transient: " + err.Error())
}
// ==== Check transient ====
if _, ok := transMap["message"]; !ok {
return shim.Error("message must be a key in the transient map")
}
if len(transMap["message"]) == 0 {
return shim.Error("message value in the transient map must be a non-empty JSON string")
}
// ==== Decode transient and Check value ====
type messageTransientInput struct {
Receiver string `json:"receiver"` //the fieldtags are needed to keep case from bouncing around
Sender string `json:"sender"`
Context string `json:"context"`
}
var messageInput messageTransientInput
err = json.Unmarshal(transMap["message"], &messageInput)
if len(messageInput.Sender) == 0 {
return shim.Error("'from' field must be a non-empty string")
}
if len(messageInput.Receiver) == 0 {
return shim.Error("'to' field must be a non-empty string")
}
if len(messageInput.Context) == 0 {
return shim.Error("'context' field must be a non-empty string")
}
// ==== Check if message already exists ====
// TODO: may check Receiver, Sender, Context and SysTime
// ==== Get member from chaincode state ====
valAsbytes, err := stub.GetPrivateData("collectionMembers", messageInput.Receiver)
if err != nil {
jsonResp = "{\"Error\":\"Failed to get state for " + messageInput.Receiver + "\"}"
return shim.Error(jsonResp)
} else if valAsbytes == nil {
jsonResp = "{\"Error\":\"Member does not exist: " + messageInput.Receiver + "\"}"
return shim.Error(jsonResp)
}
// ==== Decode Jsonreturn and Check value ====
type memberInf struct {
ObjectType string `json:"docType"` //docType is used to distinguish the various types of objects in state database
Name string `json:"name"` //the fieldtags are needed to keep case from bouncing around
PublicKey string `json:"publickey"`
PrivateKey string `json:"privatekey"`
}
var memberInfDencode memberInf
err = json.Unmarshal(valAsbytes, &memberInfDencode)
if err != nil {
return shim.Error("Failed to decode member json: " + err.Error())
}
// ==== Use Ecc to Encrypt Context ====
//fmt.Println("【ECC】 Encrypt PublicKey: ", memberInfDencode.PublicKey)
//fmt.Println("【ECC】 before Encrypt text: ", messageInput.Context)
cryptText, err := EccEncrypt([]byte(messageInput.Context), []byte(memberInfDencode.PublicKey))
if err != nil {
return shim.Error("Failed to EccEncrypt Context: " + err.Error())
}
//fmt.Println("【ECC】 after Encrypt text string: ", string(cryptText))
//fmt.Println("【ECC】 privateKey string : ", memberInfDencode.PrivateKey)
//fmt.Println("【ECC】 after Encrypt text byte: ", cryptText)
//fmt.Println("【ECC】 privateKey byte : ", []byte(memberInfDencode.PrivateKey))
//decryptedText, err := EccDecrypt(cryptText, []byte(memberInfDencode.PrivateKey))
if err != nil {
fmt.Println(err)
}
//fmt.Println("【ECC】 Decrypt text: ", string(decryptedText))
// ==== Create message object, marshal to JSON====
type messageEncrypt struct {
ObjectType string `json:"docType"` //docType is used to distinguish the various types of objects in state database
Receiver string `json:"receiver"` //the fieldtags are needed to keep case from bouncing around
Sender string `json:"sender"`
Context []byte `json:"context"`
Date string `json:"date"`
}
message := &messageEncrypt{
ObjectType: "message",
Receiver: messageInput.Receiver,
Sender: messageInput.Sender,
Context: cryptText,
Date: time.Now().Format("2006-01-02 15:04:05"),
}
messageJSONasBytes, err := json.Marshal(message)
//fmt.Println("【JSON】json bytes: ", messageJSONasBytes)
if err != nil {
return shim.Error(err.Error())
}
// ==== Save message to state ====
timeStampStr := strconv.FormatInt(time.Now().UnixNano(),10)
err = stub.PutPrivateData("collectionMessagesEncrypt", timeStampStr, messageJSONasBytes)
if err != nil {
return shim.Error(err.Error())
}
// ==== Message saved. Return success ====
fmt.Println("- end save message")
return shim.Success(nil)
}
// ===== Example: Parameterized rich query =================================================
// queryMarblesByOwner queries for marbles based on a passed in owner.
// This is an example of a parameterized query where the query logic is baked into the chaincode,
// and accepting a single query parameter (Receiver).
// Only available on state databases that support rich query (e.g. CouchDB)
// =========================================================================================
func (t *ChatChaincode) queryMessagesByReceiver(stub shim.ChaincodeStubInterface, args []string) pb.Response {
if len(args) < 1 {
return shim.Error("Incorrect number of arguments. Expecting 1")
}
receiver := strings.ToLower(args[0])
queryString := fmt.Sprintf("{\"selector\":{\"docType\":\"message\",\"receiver\":\"%s\"}}", receiver)
queryResults, err := getQueryResultForQueryString(stub, "collectionMessages", queryString)
if err != nil {
return shim.Error(err.Error())
}
return shim.Success(queryResults)
}
func (t *ChatChaincode) queryMessagesByReceiverUsePriKey(stub shim.ChaincodeStubInterface, args []string) pb.Response {
if len(args) < 2 {
return shim.Error("Incorrect number of arguments. Expecting 2")
}
receiver := strings.ToLower(args[0])
privatekey := args[1]
// ==== Decode transient and Check value ====
fmt.Println(receiver, "'s privateKey: ", privatekey)
queryString := fmt.Sprintf("{\"selector\":{\"docType\":\"message\",\"receiver\":\"%s\"}}", receiver)
queryResults, err := getDecryptedQueryResultForQueryString(stub, "collectionMessagesEncrypt", queryString, privatekey)
if err != nil {
return shim.Error(err.Error())
}
return shim.Success(queryResults)
}