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package stfe
import (
"fmt"
"net/http"
"github.com/golang/glog"
"github.com/google/trillian"
"github.com/google/trillian/types"
"google.golang.org/grpc/codes"
)
func checkQueueLeaf(rsp *trillian.QueueLeafResponse) (int, error) {
if codes.Code(rsp.QueuedLeaf.GetStatus().GetCode()) == codes.AlreadyExists {
// no need to report this as an invalid request, just (re)issue sdi
glog.V(3).Infof("queued leaf is a duplicate => %X", rsp.QueuedLeaf.Leaf.LeafValue)
}
return 0, nil
}
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)
}
// Ensure that a bad start parameter results in an error
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.StatusNotFound, fmt.Errorf("invalid start(%d): tree size is %d", req.Start, lr.TreeSize)
}
// Ensure that we got and return expected leaf indices
for i, leaf := range rsp.Leaves {
if leaf.LeafIndex != req.Start+int64(i) {
return http.StatusInternalServerError, fmt.Errorf("invalid leaf index: wanted %d, got %d", req.Start+int64(i), leaf.LeafIndex)
}
}
return 0, nil
}
func checkGetInclusionProofByHash(rsp *trillian.GetInclusionProofByHashResponse, lp *LogParameters) (int, error) {
if rsp.Proof == nil || len(rsp.Proof) == 0 {
return http.StatusNotFound, fmt.Errorf("incomplete backend response")
} // maybe redundant, but better safe than sorry
return checkHashPath(lp.HashType.Size(), rsp.Proof[0].Hashes)
}
func checkGetConsistencyProofResponse(rsp *trillian.GetConsistencyProofResponse, lp *LogParameters) (int, error) {
if rsp.Proof == nil {
return http.StatusNotFound, fmt.Errorf("incomplete backend response")
} // not redundant, out-of-range parameters yield an empty proof w/o error
return checkHashPath(lp.HashType.Size(), rsp.Proof.Hashes)
}
func checkTrillianGetLatestSignedLogRoot(rsp *trillian.GetLatestSignedLogRootResponse, lp *LogParameters) (int, error) {
if rsp.SignedLogRoot == nil {
return http.StatusInternalServerError, fmt.Errorf("incomplete backend response")
} // maybe redundant
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 len(lr.RootHash) != lp.HashType.Size() {
return http.StatusInternalServerError, fmt.Errorf("invalid root hash: %v", lr.RootHash)
} // maybe redundant, but would not necessarily be caught by marshal error
return 0, nil
}
func checkHashPath(hashSize int, path [][]byte) (int, error) {
for _, hash := range path {
if len(hash) != hashSize {
return http.StatusInternalServerError, fmt.Errorf("invalid proof: %v", path)
}
} // maybe redundant, but would not necessarily be caught by marshal error
return 0, nil
}
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