From 2fd1c7efe81d843b8828916ff692364cca2cc1c1 Mon Sep 17 00:00:00 2001
From: Rasmus Dahlberg <rasmus.dahlberg@kau.se>
Date: Tue, 20 Oct 2020 17:36:49 +0200
Subject: added basic structure

An STFE server instance that dials the Trillian gRPC back-end, and which
listens on six different HTTP endpoints but without any actual processing.
---
 handler.go | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 handler.go

(limited to 'handler.go')

diff --git a/handler.go b/handler.go
new file mode 100644
index 0000000..90dbc27
--- /dev/null
+++ b/handler.go
@@ -0,0 +1,78 @@
+package stfe
+
+import (
+	"context"
+	"fmt"
+
+	"net/http"
+
+	"github.com/golang/glog"
+)
+
+// 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(), a.instance.timesource.Now().Add(a.instance.deadline))
+	defer cancel()
+
+	if r.Method != a.method {
+		glog.Warningf("%s: got HTTP %s, wanted HTTP %s", a.instance.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: %v", a.instance.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)
+}
+
+// addEntry adds an entry to the Trillian backend
+func addEntry(ctx context.Context, i *instance, w http.ResponseWriter, r *http.Request) (int, error) {
+	glog.Info("in addEntry")
+	return http.StatusOK, nil // TODO
+}
+
+// getEntries provides with 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")
+	return http.StatusOK, nil // TODO
+}
+
+// getAnchors provides a list of configured trust anchors
+func getAnchors(ctx context.Context, i *instance, w http.ResponseWriter, r *http.Request) (int, error) {
+	glog.Info("in getAnchors")
+	return http.StatusOK, nil // TODO
+}
+
+// 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")
+	return http.StatusOK, nil // TODO
+}
+
+// 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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