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package stfe
import (
"fmt"
"net/http"
"github.com/google/trillian"
"github.com/google/trillian/types"
)
// checkGetLeavesByRange does santity-checking on a Trillian response
func checkGetLeavesByRange(rsp *trillian.GetLeavesByRangeResponse, req GetEntriesRequest) (int, error) {
if len(rsp.Leaves) > int(req.End-req.Start+1) {
return http.StatusInternalServerError, fmt.Errorf("backend GetLeavesByRange returned too many leaves: %d for [%d,%d]", len(rsp.Leaves), req.Start, req.End)
}
var lr types.LogRootV1
if err := lr.UnmarshalBinary(rsp.GetSignedLogRoot().GetLogRoot()); err != nil {
return http.StatusInternalServerError, fmt.Errorf("failed unmarshaling log root: %v", err)
}
if uint64(req.Start) >= lr.TreeSize {
return http.StatusBadRequest, fmt.Errorf("invalid start(%d): tree size is %d", req.Start, lr.TreeSize)
}
for i, leaf := range rsp.Leaves {
if leaf.LeafIndex != req.Start+int64(i) {
return http.StatusInternalServerError, fmt.Errorf("backend GetLeavesByRange returned unexpected leaf index: wanted %d, got %d", req.Start+int64(i), leaf.LeafIndex)
}
}
return 0, nil
}
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