Major rewrite

* use dep for vendoring
* lets encrypt
* moved web to transfer.sh-web repo
* single command install
* added first tests

vendor/github.com/golang/gddo/log/http_handler.go

@@ -0,0 +1,59 @@
+package log
+
+import (
+	"encoding/hex"
+	"math/rand"
+	"net/http"
+	"time"
+
+	"github.com/inconshreveable/log15"
+)
+
+const (
+	gaeRequestIDHeader = "X-AppEngine-Request-Log-Id"
+)
+
+var random = rand.New(rand.NewSource(time.Now().UnixNano()))
+
+type httpContextHandler struct {
+	log         log15.Logger
+	next        http.Handler
+	onAppEngine bool
+}
+
+// NewHTTPContextHandler adds a context logger based on the given logger to
+// each request. After a request passes through this handler,
+// Error(req.Context(), "foo") will log to that logger and add useful context
+// to each log entry.
+func NewHTTPContextHandler(h http.Handler, l log15.Logger, onAppEngine bool) http.Handler {
+	if l == nil {
+		l = log15.Root()
+	}
+
+	return &httpContextHandler{
+		log:         l,
+		next:        h,
+		onAppEngine: onAppEngine,
+	}
+}
+
+func (h *httpContextHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	// We will accept an App Engine Request Header. If there isn't one, we will
+	// fallback to 16 random bytes (hex encoded).
+	reqID := r.Header.Get(gaeRequestIDHeader)
+	if !h.onAppEngine || reqID == "" {
+		buf := make([]byte, 16)
+		random.Read(buf)
+		reqID = hex.EncodeToString(buf)
+	}
+
+	requestLogger := h.log.New(log15.Ctx{
+		"request_id": reqID,
+	})
+
+	r = r.WithContext(NewContext(ctx, requestLogger))
+
+	h.next.ServeHTTP(w, r)
+}