Proposal: Middleware Config (#908)

* Prototype middleware Config

* Refactors

* Minor refactors

caddyhttp/httpserver/path.go

@@ -0,0 +1,29 @@
+package httpserver
+
+import (
+	"net/http"
+	"strings"
+)
+
+// Path represents a URI path.
+type Path string
+
+// Matches checks to see if other matches p.
+//
+// Path matching will probably not always be a direct
+// comparison; this method assures that paths can be
+// easily and consistently matched.
+func (p Path) Matches(other string) bool {
+	if CaseSensitivePath {
+		return strings.HasPrefix(string(p), other)
+	}
+	return strings.HasPrefix(strings.ToLower(string(p)), strings.ToLower(other))
+}
+
+// PathMatcher is a Path RequestMatcher.
+type PathMatcher string
+
+// Match satisfies RequestMatcher.
+func (p PathMatcher) Match(r *http.Request) bool {
+	return Path(r.URL.Path).Matches(string(p))
+}