remote ipfs support & automatic env

Signed-off-by: Ignacio Hagopian <jsign.uy@gmail.com>

lib/ipfsbstore/ipfsbstore.go

@@ -7,6 +7,7 @@ import (
 
 	"golang.org/x/xerrors"
 
+	"github.com/multiformats/go-multiaddr"
 	"github.com/multiformats/go-multihash"
 
 	blocks "github.com/ipfs/go-block-format"
@@ -35,6 +36,18 @@ func NewIpfsBstore(ctx context.Context) (*IpfsBstore, error) {
 	}, nil
 }
 
+func NewRemoteIpfsBstore(ctx context.Context, maddr multiaddr.Multiaddr) (*IpfsBstore, error) {
+	api, err := httpapi.NewApi(maddr)
+	if err != nil {
+		return nil, xerrors.Errorf("getting remote ipfs api: %w", err)
+	}
+
+	return &IpfsBstore{
+		ctx: ctx,
+		api: api,
+	}, nil
+}
+
 func (i *IpfsBstore) DeleteBlock(cid cid.Cid) error {
 	return xerrors.Errorf("not supported")
 }