From 65195a726d9ceff4bbf870b7baa7eff20cf35381 Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Mon, 20 May 2019 23:48:43 -0600
Subject: Implement rewrite middleware; fix middleware stack bugs

---
 modules/caddyhttp/rewrite/rewrite.go | 71 ++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 modules/caddyhttp/rewrite/rewrite.go

(limited to 'modules/caddyhttp/rewrite')

diff --git a/modules/caddyhttp/rewrite/rewrite.go b/modules/caddyhttp/rewrite/rewrite.go
new file mode 100644
index 0000000..1afb8a4
--- /dev/null
+++ b/modules/caddyhttp/rewrite/rewrite.go
@@ -0,0 +1,71 @@
+package headers
+
+import (
+	"net/http"
+	"net/url"
+	"strings"
+
+	"bitbucket.org/lightcodelabs/caddy2"
+	"bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp"
+)
+
+func init() {
+	caddy2.RegisterModule(caddy2.Module{
+		Name: "http.middleware.rewrite",
+		New:  func() (interface{}, error) { return new(Rewrite), nil },
+	})
+}
+
+// Rewrite is a middleware which can rewrite HTTP requests.
+type Rewrite struct {
+	Method   string `json:"method"`
+	URI      string `json:"uri"`
+	Rehandle bool   `json:"rehandle"`
+}
+
+func (rewr Rewrite) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
+	repl := r.Context().Value(caddy2.ReplacerCtxKey).(caddy2.Replacer)
+	var rehandleNeeded bool
+
+	if rewr.Method != "" {
+		method := r.Method
+		r.Method = strings.ToUpper(repl.ReplaceAll(rewr.Method, ""))
+		if r.Method != method {
+			rehandleNeeded = true
+		}
+	}
+
+	if rewr.URI != "" {
+		// TODO: clean this all up, I don't think it's right
+
+		oldURI := r.RequestURI
+		newURI := repl.ReplaceAll(rewr.URI, "")
+		u, err := url.Parse(newURI)
+		if err != nil {
+			return caddyhttp.Error(http.StatusInternalServerError, err)
+		}
+
+		r.RequestURI = newURI
+
+		r.URL.Path = u.Path
+		if u.RawQuery != "" {
+			r.URL.RawQuery = u.RawQuery
+		}
+		if u.Fragment != "" {
+			r.URL.Fragment = u.Fragment
+		}
+
+		if newURI != oldURI {
+			rehandleNeeded = true
+		}
+	}
+
+	if rehandleNeeded && rewr.Rehandle {
+		return caddyhttp.ErrRehandle
+	}
+
+	return next.ServeHTTP(w, r)
+}
+
+// Interface guard
+var _ caddyhttp.MiddlewareHandler = (*Rewrite)(nil)
-- 
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