// charge an object. Deduct from an object, create one or more objects and
// associated to one or more wallets
func (c *ObjectController) Charge(params martini.Params, res http.ResponseWriter, req services.AuxRequestContext, log *config.CustomLog, db *services.DB) {
// parse body
var body objectChargeBody
if err := c.ParseJsonBody(req, &body); err != nil {
services.Res(res).Error(400, "invalid_body", "request body is invalid or malformed. Expects valid json body")
return
}
// TODO: get client id from access token
clientID := "kl14zFDq4SHlmmmVNHgLtE0LqCo8BTjyShOH"
// get db transaction object
dbTx, err := db.GetPostgresHandleWithRepeatableReadTrans()
if err != nil {
c.log.Error(err.Error())
services.Res(res).Error(500, "", "server error")
return
}
// get service
service, _, _ := models.FindServiceByClientId(dbTx, clientID)
// ensure object ids is not empty
if len(body.IDS) == 0 {
services.Res(res).ErrParam("ids").Error(400, "invalid_parameter", "provide one or more object ids to charge")
return
}
// ensure object ids length is less than 100
if len(body.IDS) > 100 {
services.Res(res).ErrParam("ids").Error(400, "invalid_parameter", "only a maximum of 100 objects can be charge at a time")
return
}
// ensure destination wallet is provided
if c.validate.IsEmpty(body.DestinationWalletID) {
services.Res(res).ErrParam("wallet_id").Error(400, "invalid_parameter", "destination wallet id is reqired")
return
}
// ensure amount is provided
if body.Amount < MinimumObjectUnit {
services.Res(res).ErrParam("amount").Error(400, "invalid_parameter", fmt.Sprintf("amount is below the minimum charge limit. Mininum charge limit is %.8f", MinimumObjectUnit))
return
}
// if meta is provided, ensure it is not greater than the limit size
if !c.validate.IsEmpty(body.Meta) && len([]byte(body.Meta)) > MaxMetaSize {
services.Res(res).ErrParam("meta").Error(400, "invalid_parameter", fmt.Sprintf("Meta contains too much data. Max size is %d bytes", MaxMetaSize))
return
}
// ensure destination wallet exists
wallet, found, err := models.FindWalletByObjectID(dbTx, body.DestinationWalletID)
if err != nil {
dbTx.Rollback()
c.log.Error(err.Error())
services.Res(res).Error(500, "api_error", "api_error")
return
} else if !found {
dbTx.Rollback()
services.Res(res).ErrParam("wallet_id").Error(404, "not_found", "wallet_id not found")
return
}
// find all objects
objectsFound, err := models.FindAllObjectsByObjectID(dbTx, body.IDS)
if err != nil {
dbTx.Rollback()
c.log.Error(err.Error())
services.Res(res).Error(500, "api_error", "api_error")
return
}
// ensure all objects exists
if len(objectsFound) != len(body.IDS) {
dbTx.Rollback()
services.Res(res).ErrParam("ids").Error(404, "object_error", "one or more objects do not exist")
return
}
// sort object by balance in descending order
sort.Sort(services.ByObjectBalance(objectsFound))
// objects to charge
objectsToCharge := []models.Object{}
// validate each object
// check open status (timed and pin)
// collect the required objects to sufficiently
// complete a charge from the list of found objects
for _, object := range objectsFound {
// as long as the total balance of objects to be charged is not above charge amount
// keep setting aside objects to charge from.
// once we have the required objects to cover charge amount, stop processing other objects
if TotalBalance(objectsToCharge) < body.Amount {
objectsToCharge = append(objectsToCharge, object)
} else {
break
}
// ensure service is the issuer of object
if object.Service.ObjectID != service.ObjectID {
dbTx.Rollback()
services.Res(res).ErrParam("ids").Error(402, "object_error", fmt.Sprintf("%s: service cannot charge an object not issued by it", object.ObjectID))
return
}
// ensure object is open
if !object.Open {
dbTx.Rollback()
services.Res(res).ErrParam("ids").Error(402, "object_error", fmt.Sprintf("%s: object is not opened and cannot be charged", object.ObjectID))
return
} else {
// for object with open_timed open method, ensure time is not passed
if object.OpenMethod == models.ObjectOpenTimed {
objectOpenTime := services.UnixToTime(object.OpenTime).UTC()
now := time.Now().UTC()
if now.After(objectOpenTime) {
dbTx.Rollback()
services.Res(res).ErrParam("ids").Error(402, "object_error", fmt.Sprintf("%s: object open time period has expired", object.ObjectID))
return
}
}
// for object with open_pin open method, ensure pin is provided and
// it matches. Pin should be found in the optional pin object of the request body
if object.OpenMethod == models.ObjectOpenPin {
if pin, found := body.Pins[object.ObjectID]; found {
// ensure pin provided matches objects pin
if !services.BcryptCompare(object.OpenPin, strconv.Itoa(pin)) {
dbTx.Rollback()
services.Res(res).ErrParam("ids").Error(402, "object_error", fmt.Sprintf("%s: pin provided to open object is invalid", object.ObjectID))
return
}
} else {
dbTx.Rollback()
services.Res(res).ErrParam("ids").Error(402, "object_error", fmt.Sprintf("%s: object pin not found in pin parameter of request body", object.ObjectID))
return
}
}
}
}
totalObjectsBalance := TotalBalance(objectsToCharge)
// ensure total balance of objects to charge is sufficient for charge amount
if totalObjectsBalance < body.Amount {
dbTx.Rollback()
services.Res(res).ErrParam("amount").Error(402, "invalid_parameter", fmt.Sprintf("object%s total balance not sufficient to cover charge amount", services.SIfNotZero(len(body.IDS))))
return
}
lastObj := objectsToCharge[len(objectsToCharge)-1]
// if there is excess, the last object is always the supplement object.
// deduct from last object's balance, update object and remove it from the objectsToCharge list
if totalObjectsBalance > body.Amount {
lastObj.Balance = totalObjectsBalance - body.Amount
objectsToCharge = objectsToCharge[0 : len(objectsToCharge)-1]
dbTx.Save(&lastObj)
}
// delete the objects to charge
for _, object := range objectsToCharge {
dbTx.Delete(&object)
}
// create new object. set balance to charge balance
// generate a pin
countryCallCode := config.CurrencyCallCodes[strings.ToUpper(service.Identity.BaseCurrency)]
newPin, err := services.NewObjectPin(strconv.Itoa(countryCallCode))
if err != nil {
dbTx.Rollback()
c.log.Error(err.Error())
services.Res(res).Error(500, "api_error", "server error")
return
}
newObj := NewObject(newPin, models.ObjectValue, service, wallet, body.Amount, body.Meta)
err = models.CreateObject(dbTx, &newObj)
if err != nil {
dbTx.Rollback()
c.log.Error(err.Error())
services.Res(res).Error(500, "api_error", "server error")
return
}
dbTx.Save(&newObj).Commit()
services.Res(res).Json(newObj)
}
// merge two or more objects.
// Only a max of 100 identitcal objects can be merged.
// All objects to be merged must exists.
// Only similar objects can be merged.
// Meta is not retained. Optional "meta" parameter can be
// provided as new meta for the resulting object
// TODO: Needs wallet authorization with scode "obj_merge"
func (c *ObjectController) Merge(res http.ResponseWriter, req services.AuxRequestContext, log *config.CustomLog, db *services.DB) {
// authorizing wallet id
// TODO: get this from the access token
authWalletID := "55c679145fe09c74ed000001"
// parse body
var body objectMergeBody
if err := c.ParseJsonBody(req, &body); err != nil {
services.Res(res).Error(400, "invalid_body", "request body is invalid or malformed. Expects valid json body")
return
}
// objects field is required
if body.Objects == nil {
services.Res(res).Error(400, "missing_parameter", "Missing required field: objects")
return
}
// objects field must contain at least two objects
if len(body.Objects) < 2 {
services.Res(res).Error(400, "invalid_parameter", "objects: minimum of two objects required")
return
}
// objects field must not contain more than 100 objects
if len(body.Objects) > 100 {
services.Res(res).Error(400, "invalid_parameter", "objects: cannot merge more than 100 objects in a request")
return
}
// ensure objects contain no duplicates
if services.StringSliceHasDuplicates(body.Objects) {
services.Res(res).Error(400, "invalid_parameter", "objects: must not contain duplicate objects")
return
}
// if meta is provided, ensure it is not greater than the limit size
if !c.validate.IsEmpty(body.Meta) && len([]byte(body.Meta)) > MaxMetaSize {
services.Res(res).Error(400, "invalid_meta_size", fmt.Sprintf("Meta contains too much data. Max size is %d bytes", MaxMetaSize))
return
}
// get db transaction object
dbTx, err := db.GetPostgresHandleWithRepeatableReadTrans()
if err != nil {
c.log.Error(err.Error())
services.Res(res).Error(500, "", "server error")
return
}
// find all objects
objectsFound, err := models.FindAllObjectsByObjectID(dbTx, body.Objects)
if err != nil {
dbTx.Rollback()
c.log.Error(err.Error())
services.Res(res).Error(500, "", "server error")
return
}
// ensure all objects where found
if len(objectsFound) != len(body.Objects) {
dbTx.Rollback()
services.Res(res).Error(400, "unknown_merge_objects", "one or more objects does not exists")
return
}
totalBalance := 0.0
firstObj := objectsFound[0]
checkObjName := firstObj.Service.Identity.ObjectName
for _, object := range objectsFound {
// ensure all objects are valuable and also ensure object's
if object.Type == models.ObjectValueless {
dbTx.Rollback()
services.Res(res).Error(400, "invalid_parameter", "objects: only valuable objects (object_value) can be merged")
return
}
// wallet id match the authorizing wallet id
if object.Wallet.ObjectID != authWalletID {
dbTx.Rollback()
services.Res(res).Error(401, "unauthorized", "objects: one or more objects belongs to a different wallet")
return
}
// ensure all objects are similar by their name / same issuer.
// this also ensures all objects have the same base currency
if checkObjName != object.Service.Identity.ObjectName {
dbTx.Rollback()
services.Res(res).Error(400, "invalid_parameter", "objects: only similar (by name) objects can be merged")
return
}
// updated total balance
totalBalance += object.Balance
// delete object
dbTx.Delete(&object)
}
// create a new object
// generate a pin
countryCallCode := config.CurrencyCallCodes[strings.ToUpper(firstObj.Service.Identity.BaseCurrency)]
newPin, err := services.NewObjectPin(strconv.Itoa(countryCallCode))
if err != nil {
dbTx.Rollback()
c.log.Error(err.Error())
services.Res(res).Error(500, "", "server error")
return
}
newObj := NewObject(newPin, models.ObjectValue, firstObj.Service, firstObj.Wallet, totalBalance, body.Meta)
err = models.CreateObject(dbTx, &newObj)
if err != nil {
dbTx.Rollback()
c.log.Error(err.Error())
services.Res(res).Error(500, "", "server error")
return
}
dbTx.Commit()
services.Res(res).Json(newObj)
}
