signet-backend/endpoints/createrewardfund.go

package endpoints

import (
	"encoding/json"
	"fmt"
	"github.com/imosed/signet/auth"
	. "github.com/imosed/signet/data"
	"github.com/stellar/go/clients/horizonclient"
	"github.com/stellar/go/protocols/horizon"
	"net/http"
	"strconv"
)

type SuccessResponse struct {
	Success bool `json:"success"`
}

func CreateRewardFund(resp http.ResponseWriter, req *http.Request) {
	var fund RewardFund
	dec := json.NewDecoder(req.Body)
	err := dec.Decode(&fund)
	if err != nil {
		panic("Could not read submitted reward fund")
	}

	var bonuses []Bonus

	rewardFund := RewardFund{
		Asset:           fund.Asset,
		FundWallet:      fund.FundWallet,
		IssuerWallet:    fund.IssuerWallet,
		Memo:            fund.Memo,
		Price:           0,
		AmountGoal:      fund.AmountGoal,
		MinContribution: fund.MinContribution,
		Title:           fund.Title,
		Description:     fund.Description,
		Contributions:   nil,
	}

	offerReq := horizonclient.OfferRequest{
		Seller:  rewardFund.IssuerWallet,
		Selling: fmt.Sprintf("%s:%s", rewardFund.Asset, rewardFund.IssuerWallet),
		Buying:  fmt.Sprintf("XLM:%s", rewardFund.IssuerWallet),
		Order:   horizonclient.OrderDesc,
	}
	op, err := client.Offers(offerReq)
	if err != nil {
		panic("Could not get offers")
	}
	offers := op.Embedded.Records
	var price float64
	if len(offers) == 1 {
		price, err = strconv.ParseFloat(op.Embedded.Records[0].Price, 64)
		if err != nil {
			panic("Could not parse price to float")
		}
		rewardFund.Price = price
	} else {
		var maxOffers float64 = 0
		var correctOffer horizon.Offer
		for _, o := range op.Embedded.Records {
			parsedAmt, err := strconv.ParseFloat(o.Amount, 64)
			if err != nil {
				panic("Could not parse amount to float")
			}
			if parsedAmt > maxOffers {
				correctOffer = o
				maxOffers = parsedAmt
			}
		}
		price, err = strconv.ParseFloat(correctOffer.Price, 64)
		if err != nil {
			panic("Could not parse price to float")
		}
		rewardFund.Price = price
	}

	var claims *auth.Claims
	claims, err = auth.GetUserClaims(req)
	if err != nil {
		panic("Could not determine if user is authenticated")
	}

	if claims.Privileges <= Admin {
		Db.Create(&rewardFund)

		for _, bonus := range fund.Bonuses {
			bonus.RewardFundID = rewardFund.ID
			bonuses = append(bonuses, bonus)
		}
		Db.Create(&bonuses)

		err = json.NewEncoder(resp).Encode(&SuccessResponse{Success: true})
		if err != nil {
			panic("Could not create response for created reward fund")
		}
	} else {
		resp.WriteHeader(403)
	}
}