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package instance
import (
"context"
"fmt"
"net/http"
"time"
"git.sigsum.org/sigsum-lib-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 (a Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// export prometheus metrics
var now time.Time = time.Now()
var statusCode int
defer func() {
rspcnt.Inc(a.Instance.LogID, string(a.Endpoint), fmt.Sprintf("%d", statusCode))
latency.Observe(time.Now().Sub(now).Seconds(), a.Instance.LogID, string(a.Endpoint), fmt.Sprintf("%d", statusCode))
}()
reqcnt.Inc(a.Instance.LogID, string(a.Endpoint))
ctx, cancel := context.WithDeadline(r.Context(), now.Add(a.Instance.Deadline))
defer cancel()
statusCode = a.verifyMethod(w, r)
if statusCode != 0 {
glog.Warningf("%s/%s: got HTTP %s, wanted HTTP %s", a.Instance.Prefix, string(a.Endpoint), r.Method, a.Method)
return
}
statusCode, err := a.Handler(ctx, a.Instance, w, r)
if err != nil {
glog.Warningf("handler error %s/%s: %v", a.Instance.Prefix, a.Endpoint, err)
http.Error(w, fmt.Sprintf("Error=%s\n", err.Error()), statusCode)
}
}
// 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
}
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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