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package instance
import (
"context"
"fmt"
"net/http"
"time"
"git.sigsum.org/sigsum-go/pkg/types"
"github.com/golang/glog"
)
// Handler implements the http.Handler interface, and contains a reference
// to a sigsum server instance as well as a function that uses it.
type Handler struct {
Instance *Instance
Endpoint types.Endpoint
Method string
Handler func(context.Context, *Instance, http.ResponseWriter, *http.Request) (int, error)
}
// Path returns a path that should be configured for this handler
func (h Handler) Path() string {
if len(h.Instance.Prefix) == 0 {
return h.Endpoint.Path("", "sigsum", "v0")
}
return h.Endpoint.Path("", h.Instance.Prefix, "sigsum", "v0")
}
// ServeHTTP is part of the http.Handler interface
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
start := time.Now()
code := 0
defer func() {
end := time.Now().Sub(start).Seconds()
sc := fmt.Sprintf("%d", code)
rspcnt.Inc(h.Instance.LogID, string(h.Endpoint), sc)
latency.Observe(end, h.Instance.LogID, string(h.Endpoint), sc)
}()
reqcnt.Inc(h.Instance.LogID, string(h.Endpoint))
code = h.verifyMethod(w, r)
if code != 0 {
return
}
code = h.handle(w, r)
}
// verifyMethod checks that an appropriate HTTP method is used. Error handling
// is based on RFC 7231, see Sections 6.5.5 (Status 405) and 6.5.1 (Status 400).
func (h *Handler) verifyMethod(w http.ResponseWriter, r *http.Request) int {
if h.Method == r.Method {
return 0
}
code := http.StatusBadRequest
if ok := h.Instance.checkHTTPMethod(r.Method); ok {
w.Header().Set("Allow", h.Method)
code = http.StatusMethodNotAllowed
}
http.Error(w, fmt.Sprintf("error=%s", http.StatusText(code)), code)
return code
}
// handle handles an HTTP request for which the HTTP method is already verified
func (h Handler) handle(w http.ResponseWriter, r *http.Request) int {
deadline := time.Now().Add(h.Instance.Deadline)
ctx, cancel := context.WithDeadline(r.Context(), deadline)
defer cancel()
code, err := h.Handler(ctx, h.Instance, w, r)
if err != nil {
glog.V(3).Infof("%s/%s: %v", h.Instance.Prefix, h.Endpoint, err)
http.Error(w, fmt.Sprintf("error=%s", err.Error()), code)
}
return code
}
func addLeaf(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.V(3).Info("handling add-entry request")
req, err := i.leafRequestFromHTTP(ctx, r)
if err != nil {
return http.StatusBadRequest, err
}
if err := i.Client.AddLeaf(ctx, req); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func addCosignature(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.V(3).Info("handling add-cosignature request")
req, err := i.cosignatureRequestFromHTTP(r)
if err != nil {
return http.StatusBadRequest, err
}
vk := i.Witnesses[req.KeyHash]
if err := i.Stateman.AddCosignature(ctx, &vk, &req.Cosignature); err != nil {
return http.StatusBadRequest, err
}
return http.StatusOK, nil
}
func getTreeHeadToCosign(ctx context.Context, i *Instance, w http.ResponseWriter, _ *http.Request) (int, error) {
glog.V(3).Info("handling get-tree-head-to-sign request")
sth, err := i.Stateman.ToCosignTreeHead(ctx)
if err != nil {
return http.StatusInternalServerError, err
}
if err := sth.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func getTreeHeadCosigned(ctx context.Context, i *Instance, w http.ResponseWriter, _ *http.Request) (int, error) {
glog.V(3).Info("handling get-tree-head-cosigned request")
cth, err := i.Stateman.CosignedTreeHead(ctx)
if err != nil {
return http.StatusInternalServerError, err
}
if err := cth.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func getConsistencyProof(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.V(3).Info("handling get-consistency-proof request")
req, err := i.consistencyProofRequestFromHTTP(r)
if err != nil {
return http.StatusBadRequest, err
}
// XXX: check tree size of latest thing we signed?
proof, err := i.Client.GetConsistencyProof(ctx, req)
if err != nil {
return http.StatusInternalServerError, err
}
if err := proof.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func getInclusionProof(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.V(3).Info("handling get-proof-by-hash request")
req, err := i.inclusionProofRequestFromHTTP(r)
if err != nil {
return http.StatusBadRequest, err
}
// XXX: check tree size of latest thing we signed?
proof, err := i.Client.GetInclusionProof(ctx, req)
if err != nil {
return http.StatusInternalServerError, err
}
if err := proof.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func getLeaves(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
glog.V(3).Info("handling get-leaves request")
req, err := i.leavesRequestFromHTTP(r)
if err != nil {
return http.StatusBadRequest, err
}
// XXX: check tree size of latest thing we signed?
leaves, err := i.Client.GetLeaves(ctx, req)
if err != nil {
return http.StatusInternalServerError, err
}
for _, leaf := range *leaves {
if err := leaf.ToASCII(w); err != nil {
return http.StatusInternalServerError, err
}
}
return http.StatusOK, nil
}
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