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package stfe
import (
"context"
"fmt"
"time"
"net/http"
"github.com/golang/glog"
"github.com/google/trillian"
)
// appHandler implements the http.Handler interface, and contains a reference
// to an STFE server instance as well as a function that uses it.
type appHandler struct {
instance *Instance // STFE server instance
endpoint string // e.g., add-entry
method string // e.g., GET
handler func(context.Context, *Instance, http.ResponseWriter, *http.Request) (int, error)
}
// ServeHTTP docdoc
func (a appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithDeadline(r.Context(), time.Now().Add(a.instance.Deadline))
defer cancel()
if r.Method != a.method {
glog.Warningf("%s: got HTTP %s, wanted HTTP %s", a.instance.LogParameters.Prefix+a.endpoint, r.Method, a.method)
a.sendHTTPError(w, http.StatusMethodNotAllowed, fmt.Errorf("method not allowed: %s", r.Method))
return
}
statusCode, err := a.handler(ctx, a.instance, w, r)
if err != nil {
glog.Warningf("handler error %s/%s: %v", a.instance.LogParameters.Prefix, a.endpoint, err)
a.sendHTTPError(w, statusCode, err)
}
}
// sendHTTPError replies to a request with an error message and a status code.
func (a appHandler) sendHTTPError(w http.ResponseWriter, statusCode int, err error) {
http.Error(w, http.StatusText(statusCode), statusCode)
}
func addEntry(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.Info("in addEntry")
request, err := NewAddEntryRequest(r)
if err != nil {
return http.StatusBadRequest, err
} // request can be decoded
leaf, appendix, err := VerifyAddEntryRequest(i.LogParameters, request)
if err != nil {
return http.StatusBadRequest, err
} // valid add-entry request
trillianRequest := trillian.QueueLeafRequest{
LogId: i.LogParameters.TreeId,
Leaf: &trillian.LogLeaf{
LeafValue: leaf,
ExtraData: appendix,
},
}
trillianResponse, err := i.Client.QueueLeaf(ctx, &trillianRequest)
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("backend QueueLeaf request failed: %v", err)
} // note: more detail could be provided here, see addChainInternal in ctfe
glog.Infof("Queued leaf: %v", trillianResponse.QueuedLeaf.Leaf.LeafValue)
// TODO: respond with an SDI
return http.StatusOK, nil
}
// getEntries provides a list of entries from the Trillian backend
func getEntries(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.Info("in getEntries")
request, err := NewGetEntriesRequest(r)
if err != nil {
return http.StatusBadRequest, err
} // request can be decoded and is valid
trillianRequest := trillian.GetLeavesByRangeRequest{
LogId: i.LogParameters.TreeId,
StartIndex: request.Start,
Count: request.End - request.Start + 1,
}
trillianResponse, err := i.Client.GetLeavesByRange(ctx, &trillianRequest)
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("backend GetLeavesByRange request failed: %v", err)
}
// Santity check
if len(trillianResponse.Leaves) > int(request.End-request.Start+1) {
return http.StatusInternalServerError, fmt.Errorf("backend GetLeavesByRange returned too many leaves: %d for [%d,%d]", len(trillianResponse.Leaves), request.Start, request.End)
}
for i, leaf := range trillianResponse.Leaves {
if leaf.LeafIndex != request.Start+int64(i) {
return http.StatusInternalServerError, fmt.Errorf("backend GetLeavesByRange returned unexpected leaf index: wanted %d, got %d", request.Start+int64(i), leaf.LeafIndex)
}
glog.Infof("Leaf(%d) => %v", request.Start+int64(i), leaf.GetLeafValue())
}
// TODO: use the returned root for tree_size santity checking against start?
response, err := NewGetEntriesResponse(trillianResponse.Leaves)
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("failed creating GetEntriesResponse: %v", err)
}
if err := WriteJsonResponse(response, w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
// getAnchors provides a list of configured trust anchors
func getAnchors(_ context.Context, i *Instance, w http.ResponseWriter, _ *http.Request) (int, error) {
glog.Info("in getAnchors")
data := NewGetAnchorsResponse(i.LogParameters.AnchorList)
if err := WriteJsonResponse(data, w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
// getProofByHash provides an inclusion proof based on a given leaf hash
func getProofByHash(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.Info("in getProofByHash")
request, err := NewGetProofByHashRequest(r)
if err != nil {
return http.StatusBadRequest, err
} // request can be decoded and is valid
trillianRequest := trillian.GetInclusionProofByHashRequest{
LogId: i.LogParameters.TreeId,
LeafHash: request.Hash,
TreeSize: request.TreeSize,
OrderBySequence: true,
}
trillianResponse, err := i.Client.GetInclusionProofByHash(ctx, &trillianRequest)
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("failed fetching inclusion proof from Trillian backend: %v", err)
}
// TODO: check the returned tree size in response?
// Santity check
if len(trillianResponse.Proof) == 0 {
return http.StatusNotFound, fmt.Errorf("get-proof-by-hash backend returned no proof")
}
// TODO: verify that proof is valid?
response, err := NewGetProofByHashResponse(uint64(request.TreeSize), trillianResponse.Proof[0])
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("failed creating get-proof-by-hash response: %v", err)
}
if err := WriteJsonResponse(response, w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
// getConsistencyProof provides a consistency proof between two STHs
func getConsistencyProof(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.Info("in getConsistencyProof")
return http.StatusOK, nil // TODO
}
// getSth provides the most recent STH
func getSth(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.Info("in getSth")
return http.StatusOK, nil // TODO
}
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