1 files changed, 71 insertions, 0 deletions
diff --git a/modules/caddyhttp/vars.go b/modules/caddyhttp/vars.go
new file mode 100644
index 0000000..f74556a
--- /dev/null
+++ b/modules/caddyhttp/vars.go
@@ -0,0 +1,71 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package caddyhttp
+
+import (
+	"net/http"
+
+	"github.com/caddyserver/caddy/v2"
+)
+
+func init() {
+	caddy.RegisterModule(caddy.Module{
+		Name: "http.handlers.vars",
+		New:  func() interface{} { return new(VarsMiddleware) },
+	})
+	caddy.RegisterModule(caddy.Module{
+		Name: "http.matchers.vars",
+		New:  func() interface{} { return new(VarsMiddleware) },
+	})
+}
+
+// VarsMiddleware is an HTTP middleware which sets variables
+// in the context, mainly for use by placeholders.
+type VarsMiddleware map[string]string
+
+func (t VarsMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request, next Handler) error {
+	vars := r.Context().Value(VarCtxKey).(map[string]interface{})
+	repl := r.Context().Value(caddy.ReplacerCtxKey).(caddy.Replacer)
+	for k, v := range t {
+		keyExpanded := repl.ReplaceAll(k, "")
+		valExpanded := repl.ReplaceAll(v, "")
+		vars[keyExpanded] = valExpanded
+	}
+	return next.ServeHTTP(w, r)
+}
+
+// VarsMatcher is an HTTP request matcher which can match
+// requests based on variables in the context.
+type VarsMatcher map[string]string
+
+// Match matches a request based on variables in the context.
+func (m VarsMatcher) Match(r *http.Request) bool {
+	vars := r.Context().Value(VarCtxKey).(map[string]string)
+	repl := r.Context().Value(caddy.ReplacerCtxKey).(caddy.Replacer)
+	for k, v := range m {
+		keyExpanded := repl.ReplaceAll(k, "")
+		valExpanded := repl.ReplaceAll(v, "")
+		if vars[keyExpanded] != valExpanded {
+			return false
+		}
+	}
+	return true
+}
+
+// Interface guards
+var (
+	_ MiddlewareHandler = (*VarsMiddleware)(nil)
+	_ RequestMatcher    = (*VarsMatcher)(nil)
+)