forked from hyperledger/fabric
/
art.go
2600 lines (2155 loc) · 93.6 KB
/
art.go
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/*
Copyright IT People Corp. 2017 All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
///////////////////////////////////////////////////////////////////////
// Author : IT People - Mohan Venkataraman - Auction API for v1.0
// Purpose: Explore the Hyperledger/fabric and understand
// how to write an chain code, application/chain code boundaries
// The code is not the best as it has just hammered out in a day or two
// Feedback and updates are appreciated
///////////////////////////////////////////////////////////////////////
package main
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"os"
"runtime"
"strconv"
"time"
"github.com/hyperledger/fabric/core/chaincode/shim"
pb "github.com/hyperledger/fabric/protos/peer"
)
///////////////////////////////////////////////////////////////////////////////////////
// This creates a record of the Asset (Inventory)
// Includes Description, title, certificate of authenticity or image whatever..idea is to checkin a image and store it
// in encrypted form
// Example:
// Item { 113869, "Flower Urn on a Patio", "Liz Jardine", "10102007", "Original", "Floral", "Acrylic", "15 x 15 in", "sample_9.png","$600", "My Gallery }
///////////////////////////////////////////////////////////////////////////////////////
type ItemObject struct {
ItemID string
RecType string
ItemDesc string
ItemDetail string // Could included details such as who created the Art work if item is a Painting
ItemDate string
ItemType string
ItemSubject string
ItemMedia string
ItemSize string
ItemPicFN string
ItemImage []byte // This has to be generated AES encrypted using the file name
AES_Key []byte // This is generated by the AES Algorithms
ItemImageType string // should be used to regenerate the appropriate image type
ItemBasePrice string // Reserve Price at Auction must be greater than this price
CurrentOwnerID string // This is validated for a user registered record
TimeStamp string // This is the time stamp
}
////////////////////////////////////////////////////////////////////////////////
// Has an item entry every time the item changes hands
////////////////////////////////////////////////////////////////////////////////
type ItemLog struct {
ItemID string // PRIMARY KEY
Status string // SECONDARY KEY - OnAuc, OnSale, NA
AuctionedBy string // SECONDARY KEY - Auction House ID if applicable
RecType string // ITEMHIS
ItemDesc string
CurrentOwner string
Date string // Date when status changed
}
/////////////////////////////////////////////////////////////
// Create Buyer, Seller , Auction House, Authenticator
// Could establish valid UserTypes -
// AH (Auction House)
// TR (Buyer or Seller)
// AP (Appraiser)
// IN (Insurance)
// BK (bank)
// SH (Shipper)
/////////////////////////////////////////////////////////////
type UserObject struct {
UserID string
RecType string // Type = USER
Name string
UserType string // Auction House (AH), Bank (BK), Buyer or Seller (TR), Shipper (SH), Appraiser (AP)
Address string
Phone string
Email string
Bank string
AccountNo string
RoutingNo string
Timestamp string
}
/////////////////////////////////////////////////////////////////////////////
// Register a request for participating in an auction
// Usually posted by a seller who owns a piece of ITEM
// The Auction house will determine when to open the item for Auction
// The Auction House may conduct an appraisal and genuineness of the item
/////////////////////////////////////////////////////////////////////////////
type AuctionRequest struct {
AuctionID string
RecType string // AUCREQ
ItemID string
AuctionHouseID string // ID of the Auction House managing the auction
SellerID string // ID Of Seller - to verified against the Item CurrentOwnerId
RequestDate string // Date on which Auction Request was filed
ReservePrice string // reserver price > previous purchase price
BuyItNowPrice string // 0 (Zero) if not applicable else specify price
Status string // INIT, OPEN, CLOSED (To be Updated by Trgger Auction)
OpenDate string // Date on which auction will occur (To be Updated by Trigger Auction)
CloseDate string // Date and time when Auction will close (To be Updated by Trigger Auction)
TimeStamp string // The transaction Date and Time
}
/////////////////////////////////////////////////////////////
// POST the transaction after the Auction Completes
// Post an Auction Transaction
// Post an Updated Item Object
// Once an auction request is opened for auctions, a timer is kicked
// off and bids are accepted. When the timer expires, the highest bid
// is selected and converted into a Transaction
// This transaction is a simple view
/////////////////////////////////////////////////////////////
type ItemTransaction struct {
AuctionID string
RecType string // POSTTRAN
ItemID string
TransType string // Sale, Buy, Commission
UserId string // Buyer or Seller ID
TransDate string // Date of Settlement (Buyer or Seller)
HammerTime string // Time of hammer strike - SOLD
HammerPrice string // Total Settlement price
Details string // Details about the Transaction
}
////////////////////////////////////////////////////////////////
// This is a Bid. Bids are accepted only if an auction is OPEN
////////////////////////////////////////////////////////////////
type Bid struct {
AuctionID string
RecType string // BID
BidNo string
ItemID string
BuyerID string // ID Of Buyer - to be verified against the Item CurrentOwnerId
BidPrice string // BidPrice > Previous Bid
BidTime string // Time the bid was received
}
//////////////////////////////////////////////////////////////
// Invoke Functions based on Function name
// The function name gets resolved to one of the following calls
// during an invoke
//
//////////////////////////////////////////////////////////////
func InvokeFunction(fname string) func(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
InvokeFunc := map[string]func(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response{
"iPostItem": PostItem,
"iPostUser": PostUser,
"iPostAuctionRequest": PostAuctionRequest,
"iPostTransaction": PostTransaction,
"iPostBid": PostBid,
"iOpenAuctionForBids": OpenAuctionForBids,
"iBuyItNow": BuyItNow,
"iTransferItem": TransferItem,
"iCloseAuction": CloseAuction,
"iCloseOpenAuctions": CloseOpenAuctions,
"iDownloadImages": DownloadImages,
}
return InvokeFunc[fname]
}
//////////////////////////////////////////////////////////////
// Query Functions based on Function name
//
//////////////////////////////////////////////////////////////
func QueryFunction(fname string) func(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
QueryFunc := map[string]func(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response{
"qGetItem": GetItem,
"qGetUser": GetUser,
"qGetAuctionRequest": GetAuctionRequest,
"qGetTransaction": GetTransaction,
"qGetBid": GetBid,
"qGetLastBid": GetLastBid,
"qGetHighestBid": GetHighestBid,
"qGetNoOfBidsReceived": GetNoOfBidsReceived,
"qGetListOfBids": GetListOfBids,
"qGetItemLog": GetItemLog,
"qGetItemListByCat": GetItemListByCat,
"qGetUserListByCat": GetUserListByCat,
"qGetListOfInitAucs": GetListOfInitAucs,
"qGetListOfOpenAucs": GetListOfOpenAucs,
"qValidateItemOwnership": ValidateItemOwnership,
}
return QueryFunc[fname]
}
/////////////////////////////////////////////////////////////////////////////////////////////////////
// We are storing the PictureMap as a Key/Value pair to download the images on the container.
// This was done to run the Daily/Weeky Test Cases from CLI
/////////////////////////////////////////////////////////////////////////////////////////////////////
//func GetPictureUrl(picname string) string {
var PictureMap = map[string]string{
"art1.png": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/art1.png",
"art2.png": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/art2.png",
"art3.png": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/art3.png",
"art4.png": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/art4.png",
"art5.png": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/art5.png",
"art6.png": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/art6.png",
"art7.png": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/art7.png",
"item-001.jpg": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/item-001.jpg",
"item-002.jpg": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/item-002.jpg",
"item-003.jpg": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/item-003.jpg",
"item-004.jpg": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/item-004.jpg",
"item-005.jpg": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/item-005.jpg",
"item-006.jpg": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/item-006.jpg",
"item-007.jpg": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/item-007.jpg",
"item-008.jpg": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/item-008.jpg",
"people.gif": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/people.gif",
"mad-fb.jpg": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/mad-fb.gif",
"sample.png": "https://raw.githubusercontent.com/ITPeople-Blockchain/auction/v0.6/art/artchaincode/sample.png",
}
type SimpleChaincode struct {
}
////////////////////////////////////////////////////////////////////////////////
// Chain Code Kick-off Main function
////////////////////////////////////////////////////////////////////////////////
func main() {
// maximize CPU usage for maximum performance
runtime.GOMAXPROCS(runtime.NumCPU())
fmt.Println("Starting Item Auction Application chaincode BlueMix ver 21 Dated 2016-07-02 09.45.00: ")
//ccPath = fmt.Sprintf("%s/src/github.com/hyperledger/fabric/auction/art/artchaincode/", gopath)
// Start the shim -- running the fabric
err := shim.Start(new(SimpleChaincode))
if err != nil {
fmt.Println("Error starting Item Fun Application chaincode: %s", err)
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////
// We are storing the PictureMap as a Key/Value pair to download the images on the container.
// This was done to run the Daily/Weeky Test Cases from CLI
/////////////////////////////////////////////////////////////////////////////////////////////////////
func downloadFile(filepath string, url string) (err error) {
// Create the file
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
// Get the data
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
// Writer the body to file
_, err = io.Copy(out, resp.Body)
if err != nil {
return err
}
return nil
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// SimpleChaincode - Init Chaincode implementation - The following sequence of transactions can be used to test the Chaincode
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
// TODO - Include all initialization to be complete before Invoke and Query
// Uses aucTables to delete tables if they exist and re-create them
//myLogger.Info("[Trade and Auction Application] Init")
fmt.Println("[Trade and Auction Application] Init")
fmt.Println("\nInit() Initialization Complete ")
return shim.Success(nil)
}
////////////////////////////////////////////////////////////////
// SimpleChaincode - INVOKE Chaincode implementation
// User Can Invoke
// - Register a user using PostUser
// - Register an item using PostItem
// - The Owner of the item (User) can request that the item be put on auction using PostAuctionRequest
// - The Auction House can request that the auction request be Opened for bids using OpenAuctionForBids
// - One the auction is OPEN, registered buyers (Buyers) can send in bids vis PostBid
// - No bid is accepted when the status of the auction request is INIT or CLOSED
// - Either manually or by OpenAuctionRequest, the auction can be closed using CloseAuction
// - The CloseAuction creates a transaction and invokes PostTransaction
////////////////////////////////////////////////////////////////
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
function, args := stub.GetFunctionAndParameters()
fmt.Println("==========================================================")
fmt.Println("BEGIN Function ====> ", function)
if function[0:1] == "i" {
fmt.Println("==========================================================")
return t.invoke(stub, function, args)
}
if function[0:1] == "q" {
fmt.Println("==========================================================")
return t.query(stub, function, args)
}
fmt.Println("==========================================================")
return shim.Error("Invoke: Invalid Function Name - function names begin with a q or i")
}
////////////////////////////////////////////////////////////////
// SimpleChaincode - INVOKE Chaincode implementation
// User Can Invoke
// - Register a user using PostUser
// - Register an item using PostItem
// - The Owner of the item (User) can request that the item be put on auction using PostAuctionRequest
// - The Auction House can request that the auction request be Opened for bids using OpenAuctionForBids
// - One the auction is OPEN, registered buyers (Buyers) can send in bids vis PostBid
// - No bid is accepted when the status of the auction request is INIT or CLOSED
// - Either manually or by OpenAuctionRequest, the auction can be closed using CloseAuction
// - The CloseAuction creates a transaction and invokes PostTransaction
////////////////////////////////////////////////////////////////
func (t *SimpleChaincode) invoke(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Check Type of Transaction and apply business rules
// before adding record to the block chain
// In this version, the assumption is that args[1] specifies recType for all defined structs
// Newer structs - the recType can be positioned anywhere and ChkReqType will check for recType
// example:
// ./peer chaincode invoke -l golang -n mycc -c '{"Function": "PostBid", "Args":["1111", "BID", "1", "1000", "300", "1200"]}'
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
if ChkRecType(args) == true {
InvokeRequest := InvokeFunction(function)
if InvokeRequest != nil {
response := InvokeRequest(stub, function, args)
return (response)
}
} else {
fmt.Println("Invoke() Invalid recType : ", args, "\n")
error_str := "Invoke() : Invalid recType : " + args[0]
return shim.Error(error_str)
}
return shim.Success(nil)
}
//////////////////////////////////////////////////////////////////////////////////////////
// SimpleChaincode - query Chaincode implementation
// Client Can Query
// Sample Data
// ./peer chaincode query -l golang -n mycc -c '{"Function": "GetUser", "Args": ["4000"]}'
// ./peer chaincode query -l golang -n mycc -c '{"Function": "GetItem", "Args": ["2000"]}'
//////////////////////////////////////////////////////////////////////////////////////////
func (t *SimpleChaincode) query(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
// var buff []byte
var response pb.Response
fmt.Println("Query() : ID Extracted and Type = ", args[0])
fmt.Println("Query() : Args supplied : ", args)
if len(args) < 1 {
fmt.Println("Query() : Include at least 1 arguments Key ")
return shim.Error("Query() : Expecting Transaction type and Key value for query")
}
QueryRequest := QueryFunction(function)
if QueryRequest != nil {
response = QueryRequest(stub, function, args)
} else {
fmt.Println("Query() Invalid function call : ", function)
response_str := "Query() : Invalid function call : " + function
return shim.Error(response_str)
}
if response.Status != shim.OK {
fmt.Println("Query() Object not found : ", args[0])
response_str := "Query() : Object not found : " + args[0]
return shim.Error(response_str)
}
return response
}
//////////////////////////////////////////////////////////////////////////////////////////
// Download Images into Peer
//////////////////////////////////////////////////////////////////////////////////////////
func DownloadImages(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
fmt.Println("[Trade and Auction Application] DownloadImages")
var err error
for k, v := range PictureMap {
fmt.Printf("\n Downloading Image '%s' from URL: %s", k, v)
err = downloadFile(k, v)
if err != nil {
fmt.Println(err)
return shim.Error("Invoke: Invalid Function Name - function names begin with a q or i")
}
}
fmt.Println("\nDownloadImages() Complete ")
return shim.Success(nil)
}
//////////////////////////////////////////////////////////////////////////////////////////
// Retrieve User Information
// example:
// ./peer chaincode query -l golang -n mycc -c '{"Function": "GetUser", "Args": ["100"]}'
//
//////////////////////////////////////////////////////////////////////////////////////////
func GetUser(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
var err error
// Get the Object and Display it
Avalbytes, err := QueryObject(stub, "User", args)
if err != nil {
fmt.Println("GetUser() : Failed to Query Object ")
jsonResp := "{\"Error\":\"Failed to get Object Data for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
if Avalbytes == nil {
fmt.Println("GetUser() : Incomplete Query Object ")
jsonResp := "{\"Error\":\"Incomplete information about the key for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
fmt.Println("GetUser() : Response : Successful -")
return shim.Success(Avalbytes)
}
/////////////////////////////////////////////////////////////////////////////////////////
// Query callback representing the query of a chaincode
// Retrieve a Item by Item ID
// QueryObjectWithProcessingFunction takes a post processing function as argument
// peer chaincode query -l golang -n mycc -c '{"Args": ["qGetItem", "1000"]}
//
/////////////////////////////////////////////////////////////////////////////////////////
func GetItem(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
var err error
// Get the Objects and Display it
Avalbytes, err := QueryObjectWithProcessingFunction(stub, "Item", args, ProcessQueryResult)
if err != nil {
fmt.Println("GetItem() : Failed to Query Object ")
jsonResp := "{\"Error\":\"Failed to get Object Data for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
if Avalbytes == nil {
fmt.Println("GetItem() : Incomplete Query Object ")
jsonResp := "{\"Error\":\"Incomplete information about the key for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
// Masking ItemImage binary data
itemObj, _ := JSONtoAR(Avalbytes)
itemObj.ItemImage = []byte{}
Avalbytes, _ = ARtoJSON(itemObj)
fmt.Println("GetItem() : Response : Successful ")
return shim.Success(Avalbytes)
}
/////////////////////////////////////////////////////////////////////////////////////////
// Validates The Ownership of an Asset using ItemID, OwnerID, and HashKey
//
// peer chaincode query -l golang -n mycc -c '{"Function": "ValidateItemOwnership", "Args": ["1000", "100", "tGEBaZuKUBmwTjzNEyd+nr/fPUASuVJAZ1u7gha5fJg="]}'
//
/////////////////////////////////////////////////////////////////////////////////////////
func ValidateItemOwnership(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
var err error
if len(args) < 3 {
fmt.Println("ValidateItemOwnership() : Requires 3 arguments Item#, Owner# and Key ")
return shim.Error("ValidateItemOwnership() : Requires 3 arguments Item#, Owner# and Key")
}
// Get the Object Information
Avalbytes, err := QueryObject(stub, "Item", []string{args[0]})
if err != nil {
fmt.Println("ValidateItemOwnership() : Failed to Query Object ")
jsonResp := "{\"Error\":\"Failed to get Object Data for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
if Avalbytes == nil {
fmt.Println("ValidateItemOwnership() : Incomplete Query Object ")
jsonResp := "{\"Error\":\"Incomplete information about the key for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
myItem, err := JSONtoAR(Avalbytes)
if err != nil {
fmt.Println("ValidateItemOwnership() : Failed to Query Object ")
jsonResp := "{\"Error\":\"Failed to get Object Data for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
myKey := GetKeyValue(Avalbytes, "AES_Key")
fmt.Println("Key String := ", myKey)
if myKey != args[2] {
fmt.Println("ValidateItemOwnership() : Key does not match supplied key ", args[2], " - ", myKey)
jsonResp := "{\"Error\":\"ValidateItemOwnership() : Key does not match asset owner supplied key " + args[0] + "\"}"
return shim.Error(jsonResp)
}
if myItem.CurrentOwnerID != args[1] {
fmt.Println("ValidateItemOwnership() : ValidateItemOwnership() : Owner-Id does not match supplied ID ", args[1])
jsonResp := "{\"Error\":\"ValidateItemOwnership() : Owner-Id does not match supplied ID " + args[0] + "\"}"
return shim.Error(jsonResp)
}
fmt.Print("ValidateItemOwnership() : Response : Successful - \n")
return shim.Success(Avalbytes)
}
/////////////////////////////////////////////////////////////////////////////////////////////////////
// Retrieve Auction Information
// This query runs against the AuctionTable
// ./peer chaincode query -l golang -n mycc -c '{"Function": "GetAuctionRequest", "Args": ["1111"]}'
// There are two other tables just for query purposes - AucInitTable, AucOpenTable
//
/////////////////////////////////////////////////////////////////////////////////////////////////////
func GetAuctionRequest(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
var err error
// Get the Objects and Display it
Avalbytes, err := QueryObject(stub, "Auction", args)
if err != nil {
fmt.Println("GetAuctionRequest() : Failed to Query Object ")
jsonResp := "{\"Error\":\"Failed to get Object Data for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
if Avalbytes == nil {
fmt.Println("GetAuctionRequest() : Incomplete Query Object ")
jsonResp := "{\"Error\":\"Incomplete information about the key for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
fmt.Println("GetAuctionRequest() : Response : Successful - \n")
return shim.Success(Avalbytes)
}
///////////////////////////////////////////////////////////////////////////////////////////////////
// Retrieve a Bid based on two keys - AucID, BidNo
// A Bid has two Keys - The Auction Request Number and Bid Number
// ./peer chaincode query -l golang -n mycc -c '{"Function": "GetLastBid", "Args": ["1111", "1"]}'
//
///////////////////////////////////////////////////////////////////////////////////////////////////
func GetBid(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
var err error
// Check there are 2 Arguments provided as per the struct - two are computed
// See example
if len(args) < 2 {
fmt.Println("GetBid(): Incorrect number of arguments. Expecting 2 ")
fmt.Println("GetBid(): ./peer chaincode query -l golang -n mycc -c '{\"Function\": \"GetBid\", \"Args\": [\"1111\",\"6\"]}'")
return shim.Error("GetBid(): Incorrect number of arguments. Expecting 2 ")
}
// Get the Objects and Display it
Avalbytes, err := QueryObject(stub, "Bid", args)
if err != nil {
fmt.Println("GetBid() : Failed to Query Object ")
jsonResp := "{\"Error\":\"Failed to get Object Data for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
if Avalbytes == nil {
fmt.Println("GetBid() : Incomplete Query Object ")
jsonResp := "{\"Error\":\"Incomplete information about the key for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
fmt.Println("GetBid() : Response : Successful -")
return shim.Success(Avalbytes)
}
///////////////////////////////////////////////////////////////////////////////////////////////////
// Retrieve Auction Closeout Information. When an Auction closes
// The highest bid is retrieved and converted to a Transaction
// ./peer chaincode query -l golang -n mycc -c '{"Function": "GetTransaction", "Args": ["1111"]}'
//
///////////////////////////////////////////////////////////////////////////////////////////////////
func GetTransaction(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
//var err error
// Get the Objects and Display it
Avalbytes, err := QueryObject(stub, "Trans", args)
if Avalbytes == nil {
fmt.Println("GetTransaction() : Incomplete Query Object ")
jsonResp := "{\"Error\":\"Incomplete information about the key for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
if err != nil {
fmt.Println("GetTransaction() : Failed to Query Object ")
jsonResp := "{\"Error\":\"Failed to get Object Data for " + args[0] + "\"}"
return shim.Error(jsonResp)
}
fmt.Println("GetTransaction() : Response : Successful")
return shim.Success(Avalbytes)
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Create a User Object. The first step is to have users
// registered
// There are different types of users - Traders (TRD), Auction Houses (AH)
// Shippers (SHP), Insurance Companies (INS), Banks (BNK)
// While this version of the chain code does not enforce strict validation
// the business process recommends validating each persona for the service
// they provide or their participation on the auction blockchain, future enhancements will do that
// ./peer chaincode invoke -l golang -n mycc -c '{"Function": "PostUser", "Args":["100", "USER", "Ashley Hart", "TRD", "Morrisville Parkway, #216, Morrisville, NC 27560", "9198063535", "ashley@itpeople.com", "SUNTRUST", "00017102345", "0234678"]}'
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
func PostUser(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
record, err := CreateUserObject(args[0:]) //
if err != nil {
return shim.Error(err.Error())
}
buff, err := UsertoJSON(record) //
if err != nil {
error_str := "PostuserObject() : Failed Cannot create object buffer for write : " + args[1]
fmt.Println(error_str)
return shim.Error(error_str)
} else {
// Update the ledger with the Buffer Data
// err = stub.PutState(args[0], buff)
keys := []string{args[0]}
err = UpdateObject(stub, "User", keys, buff)
if err != nil {
fmt.Println("PostUser() : write error while inserting record")
return shim.Error("PostUser() : write error while inserting record : Error - " + err.Error())
}
// Post Entry into UserCat- i.e. User Category Table
keys = []string{"2016", args[3], args[0]}
err = UpdateObject(stub, "UserCat", keys, buff)
if err != nil {
error_str := "PostUser() : write error while inserting recordinto UserCat"
fmt.Println(error_str)
return shim.Error(error_str)
}
}
return shim.Success(buff)
}
func CreateUserObject(args []string) (UserObject, error) {
var err error
var aUser UserObject
// Check there are 11 Arguments
if len(args) != 11 {
fmt.Println("CreateUserObject(): Incorrect number of arguments. Expecting 11 ")
return aUser, errors.New("CreateUserObject() : Incorrect number of arguments. Expecting 11 ")
}
// Validate UserID is an integer
_, err = strconv.Atoi(args[0])
if err != nil {
return aUser, errors.New("CreateUserObject() : User ID should be an integer")
}
aUser = UserObject{args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10]}
fmt.Println("CreateUserObject() : User Object : ", aUser)
return aUser, nil
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Create a master Object of the Item
// Since the Owner Changes hands, a record has to be written for each
// Transaction with the updated Encryption Key of the new owner
// Example
//./peer chaincode invoke -l golang -n mycc -c '{"Function": "PostItem", "Args":["1000", "ARTINV", "Shadows by Asppen", "Asppen Messer", "20140202", "Original", "Landscape" , "Canvas", "15 x 15 in", "sample_7.png","$600", "100", "2016-02-02 03:000:00"]}'
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
func PostItem(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
itemObject, err := CreateItemObject(args[0:])
if err != nil {
fmt.Println("PostItem(): Cannot create item object \n")
return shim.Error("PostItem(): Cannot create item object")
}
// Check if the Owner ID specified is registered and valid
response := ValidateMember(stub, itemObject.CurrentOwnerID)
ownerInfo := response.Payload
fmt.Println("Owner information ", ownerInfo, itemObject.CurrentOwnerID)
if response.Status != shim.OK {
error_str := "PostItem() : Failed Owner information not found for " + itemObject.CurrentOwnerID
fmt.Println(error_str)
return shim.Error(error_str)
}
// Convert Item Object to JSON
buff, err := ARtoJSON(itemObject) //
if err != nil {
error_str := "PostItem() : Failed Cannot create object buffer for write : " + args[1]
fmt.Println(error_str)
return shim.Error(error_str)
} else {
// Update the ledger with the Buffer Data
// err = stub.PutState(args[0], buff)
keys := []string{args[0]}
err = UpdateObject(stub, "Item", keys, buff)
if err != nil {
fmt.Println("PostItem() : write error while inserting record\n")
return shim.Error("PostItem() : write error while inserting record : " + err.Error())
}
// Put an entry into the Item History Table
response := PostItemLog(stub, itemObject, "INITIAL", "DEFAULT", args[12])
if response.Status != shim.OK {
fmt.Println("PostItemLog() : write error while inserting record\n")
return shim.Error("PostItemLog() : write error while inserting record : Error : " + err.Error())
}
// Post Entry into ItemCatTable - i.e. Item Category Table
// The first key 2016 is a dummy (band aid) key to extract all values
keys = []string{"2016", args[6], args[0]}
err = UpdateObject(stub, "ItemCat", keys, buff)
if err != nil {
fmt.Println("PostItem() : Write error while inserting record into ItemCat \n")
return shim.Error("PostItem() : Write error while inserting record into ItemCat : Error : " + err.Error())
}
}
secret_key, _ := json.Marshal(itemObject.AES_Key)
fmt.Println(string(secret_key))
return shim.Success(secret_key)
}
func CreateItemObject(args []string) (ItemObject, error) {
var err error
var myItem ItemObject
// Check there are 13 Arguments provided as per the struct - two are computed
if len(args) != 13 {
fmt.Println("CreateItemObject(): Incorrect number of arguments. Expecting 13 ")
return myItem, errors.New("CreateItemObject(): Incorrect number of arguments. Expecting 13 ")
}
// Validate ItemID is an integer
_, err = strconv.Atoi(args[0])
if err != nil {
fmt.Println("CreateItemObject(): ART ID should be an integer create failed! ")
return myItem, errors.New("CreateItemObject(): ART ID should be an integer create failed!")
}
// Validate Picture File exists based on the name provided
// Looks for file in current directory of application and must be fixed for other locations
// Validate Picture File exists based on the name provided
// Looks for file in current directory of application and must be fixed for other locations
imagePath := args[9]
if _, err := os.Stat(imagePath); err == nil {
fmt.Println(imagePath, " exists!")
} else {
fmt.Println("CreateItemObject(): Cannot find or load Picture File = %s : %s\n", imagePath, err)
return myItem, errors.New("CreateItemObject(): ART Picture File not found " + imagePath)
}
// Get the Item Image and convert it to a byte array
imagebytes, fileType := ImageToByteArray(imagePath)
// Generate a new key and encrypt the image
AES_key, _ := GenAESKey()
AES_enc := Encrypt(AES_key, imagebytes)
// Append the AES Key, The Encrypted Image Byte Array and the file type
myItem = ItemObject{args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], AES_enc, AES_key, fileType, args[10], args[11], args[12]}
fmt.Println("CreateItemObject(): Item Object created: ", myItem.ItemID, myItem.AES_Key)
// Code to Validate the Item Object)
// If User presents Crypto Key then key is used to validate the picture that is stored as part of the title
// TODO
return myItem, nil
}
///////////////////////////////////////////////////////////////////////////////////
// Since the Owner Changes hands, a record has to be written for each
// Transaction with the updated Encryption Key of the new owner
// This function is internally invoked by PostTransaction and is not a Public API
///////////////////////////////////////////////////////////////////////////////////
func UpdateItemObject(stub shim.ChaincodeStubInterface, ar []byte, hammerPrice string, buyer string) pb.Response {
var err error
myItem, err := JSONtoAR(ar)
if err != nil {
fmt.Println("UpdateItemObject() : Failed to create Art Record Object from JSON ")
return shim.Error("UpdateItemObject() : Failed to create Art Record Object from JSON : Error : " + err.Error())
}
// Insert logic to re-encrypt image by first fetching the current Key
CurrentAES_Key := myItem.AES_Key
// Decrypt Image and Save Image in a file
image := Decrypt(CurrentAES_Key, myItem.ItemImage)
// Get a New Key & Encrypt Image with New Key
myItem.AES_Key, _ = GenAESKey()
myItem.ItemImage = Encrypt(myItem.AES_Key, image)
// Update the owner to the Buyer and update price to auction hammer price
myItem.ItemBasePrice = hammerPrice
myItem.CurrentOwnerID = buyer
ar, err = ARtoJSON(myItem)
// keys := []string{myItem.ItemID, myItem.CurrentOwnerID} // Was the original in v0.6
keys := []string{myItem.ItemID}
err = ReplaceObject(stub, "Item", keys, ar)
if err != nil {
fmt.Println("UpdateItemObject() : Failed ReplaceObject in ItemTable into Blockchain ")
return shim.Error("UpdateItemObject() : Failed ReplaceObject in ItemTable into Blockchain : Error : " + err.Error())
}
fmt.Println("UpdateItemObject() : ReplaceObject in Item successful ")
// Update entry in Item Category Table as it holds the Item object as wekk
keys = []string{"2016", myItem.ItemSubject, myItem.ItemID}
err = ReplaceObject(stub, "ItemCat", keys, ar)
if err != nil {
fmt.Println("UpdateItemObject() : Failed ReplaceObject in ItemCategory into Blockchain ")
return shim.Error("UpdateItemObject() : Failed ReplaceObject in ItemCategory into Blockchain : Error : " + err.Error())
}
fmt.Println("UpdateItemObject() : ReplaceObject in ItemCategory successful ")
return shim.Success(myItem.AES_Key)
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Obtain Asset Details and Validate Item
// Transfer Item to new owner - no change in price - In the example XFER is the recType
// ./peer chaincode invoke -l golang -n mycc -c '{"Function": "TransferItem", "Args": ["1000", "100", "tGEBaZuKUBmwTjzNEyd+nr/fPUASuVJAZ1u7gha5fJg=", "300", "XFER"]}'
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
func TransferItem(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
var err error
if len(args) < 6 {
fmt.Println("TransferItem() : Requires 6 arguments Item#, Owner#, Key#, newOwnerID#, XFER \n")
return shim.Error("TransferItem() : Requires 6 arguments Item#, Owner#, Key#, newOwnerID#, XFER")
}
// Let us make sure that the Item is not on Auction
err = VerifyIfItemIsOnAuction(stub, args[0])
if err != nil {
error_str := "TransferItem() : Failed Item is either initiated or opened for Auction " + args[0]
fmt.Println(error_str)
return shim.Error(error_str + ": Error : " + err.Error())
}
// Validate New Owner's ID
response := ValidateMember(stub, args[3])
if response.Status != shim.OK {
error_str := "TransferItem() : Failed transferee not Registered in Blockchain " + args[3]
fmt.Println(error_str)
return shim.Error(error_str + ": Error : " + response.Message)
}
// Validate Item or Asset Ownership
response = ValidateItemOwnership(stub, "ValidateItemOwnership", args[:3])
if response.Status != shim.OK {
error_str := "TransferItem() : ValidateItemOwnership() : Failed to authenticate item or asset ownership"
fmt.Println(error_str)
return shim.Error(error_str + ": Error : " + response.Message)
}
ar := response.Payload
myItem, err := JSONtoAR(ar)
if err != nil {
error_str := "TransferItem() : Failed to create item Object from JSON "
fmt.Println(error_str)
return shim.Error(error_str + ": Error : " + err.Error())
}
// Insert logic to re-encrypt image by first fetching the current Key
CurrentAES_Key := myItem.AES_Key
// Decrypt Image and Save Image in a file
image := Decrypt(CurrentAES_Key, myItem.ItemImage)
// Get a New Key & Encrypt Image with New Key
myItem.AES_Key, _ = GenAESKey()
myItem.ItemImage = Encrypt(myItem.AES_Key, image)
// Update the owner to the new owner transferred to
myItem.CurrentOwnerID = args[3]
ar, err = ARtoJSON(myItem)
keys := []string{myItem.ItemID}
err = ReplaceObject(stub, "Item", keys, ar)
if err != nil {
fmt.Println("TransferAsset() : Failed ReplaceObject in ItemTable into Blockchain ")
return shim.Error(err.Error())
}
fmt.Println("TransferAsset() : ReplaceObject in Item successful ")
// Update entry in Item Category Table as it holds the Item object as well
keys = []string{"2016", myItem.ItemSubject, myItem.ItemID}
err = ReplaceObject(stub, "ItemCat", keys, ar)
if err != nil {
fmt.Println("TransferAsset() : Failed ReplaceObject in ItemCategoryTable into Blockchain ")
return shim.Error(err.Error())
}
response = PostItemLog(stub, myItem, "Transfer", args[1], args[5])
if response.Status != shim.OK {
fmt.Println("TransferItem() : PostItemLog() write error while inserting record\n")
return shim.Error(err.Error())
}
fmt.Println("TransferAsset() : ReplaceObject in ItemCategory successful ")
return shim.Success(myItem.AES_Key)
}
////////////////////////////////////////////////////////////////////////////////////
// Validate Item Status - Is it currently on Auction, if so Reject Transfer Request
// This can be written better - will do so if things work
// The function return the Auction ID and the Status = OPEN or INIT
////////////////////////////////////////////////////////////////////////////////////
func VerifyIfItemIsOnAuction(stub shim.ChaincodeStubInterface, itemID string) error {
response := GetListOfOpenAucs(stub, "AucOpen", []string{"2016"})
if response.Status != shim.OK {
return fmt.Errorf("VerifyIfItemIsOnAuction() operation failed. Error retrieving values from AucOpen: %s", response.Message)
}
rows := response.Payload
tlist := make([]AuctionRequest, len(rows))
err := json.Unmarshal([]byte(rows), &tlist)
if err != nil {
fmt.Println("VerifyIfItemIsOnAuction: Unmarshal failed : ", err)
return fmt.Errorf("VerifyIfItemIsOnAuction: operation failed. Error un-marshaling JSON: %s", err)
}
for i := 0; i < len(tlist); i++ {
ar := tlist[i]
// Compare Auction IDs
if ar.ItemID == itemID {
fmt.Println("VerifyIfItemIsOnAuction() Failed : Ummarshall error")
return fmt.Errorf("VerifyIfItemIsOnAuction() operation failed. %s", itemID)
}
}
// Now Check if an Auction Has been inititiated
// If so , it has to be removed from Auction for a Transfer
response = GetListOfInitAucs(stub, "AucInit", []string{"2016"})
if response.Status != shim.OK {
return fmt.Errorf("VerifyIfItemIsOnAuction() operation failed. Error retrieving values from AucInit: %s", err)
}
rows = response.Payload
tlist = make([]AuctionRequest, len(rows))
err = json.Unmarshal([]byte(rows), &tlist)
if err != nil {
fmt.Println("VerifyIfItemIsOnAuction() Unmarshal failed : ", err)