msg_server_donate_fund.go

package keeper

import (
 "context"
 "github.com/cosmonaut/gofundme/x/gofundme/types"
 sdk "github.com/cosmos/cosmos-sdk/types"
 sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
)

func (k msgServer) DonateFund(goCtx context.Context, msg *types.MsgDonateFund) (*types.MsgDonateFundResponse, error) {
   ctx := sdk.UnwrapSDKContext(goCtx)
  
   //Find a gofundme campaign using its id
   gofundme, found := k.GetGofundme(ctx, msg.Id)
   if !found {
    return nil, sdkerrors.Wrapf(sdkerrors.ErrKeyNotFound, "gofundme campaign with id %s not found", msg.Id)
   }
  
   //Get the start date
   start, err := sdk.ParseTimeBytes([]byte(gofundme.Start))
   if err != nil {
    return nil, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, err.Error())
   }
  
   //Get the end date
   end, err := sdk.ParseTimeBytes([]byte(gofundme.End))
   if err != nil {
    return nil, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, err.Error())
   }
  
   //Check whether the current time is between the start and end date
   if ctx.BlockTime().Before(start) || ctx.BlockTime().After(end) {
    return nil, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "gofundme campaign is not active")
   }
  
   //Get the donor's address
   donor, err := sdk.AccAddressFromBech32(msg.Creator)
   if err != nil {
    return nil, sdkerrors.Wrapf(sdkerrors.ErrInvalidAddress, "invalid donor address (%s)", donor)
   }
  
   //Get the donation amount
   donation, _ := sdk.ParseCoinsNormalized(msg.Donation)
  
   //Ensure that the donation amount is greater than 0
   if donation.IsZero() {
    return nil, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "donation amount must be greater than 0")
   }
  
   //Update the gofundme status
   gofundme.Donor = append(gofundme.Donor, msg.Creator)
   gofundme.Donation = append(gofundme.Donation, msg.Donation)
   gofundme.Totaldonations += donation[0].Amount.Uint64()
  
   //Use the module account as an escrow account
   sdkError := k.bankKeeper.SendCoinsFromAccountToModule(ctx, donor, types.ModuleName, donation)
   if sdkError != nil {
    return nil, sdkError
   }
  
   k.SetGofundme(ctx, gofundme)
   return &types.MsgDonateFundResponse{}, nil
}