caddyhttp: Add {?query} placeholder (#6714)

* caddyhttp: Add `{prefixed_query}` placeholder

* fastcgi: Preserve query during canonical redirect

* Use orig_uri instead for the redirect, shorter Caddyfile shortcut

caddyconfig/httpcaddyfile/shorthands.go

@@ -52,19 +52,27 @@ func NewShorthandReplacer() ShorthandReplacer {
 // be used in the Caddyfile, and the right is the replacement.
 func placeholderShorthands() []string {
 	return []string{
-		"{dir}", "{http.request.uri.path.dir}",
-		"{file}", "{http.request.uri.path.file}",
 		"{host}", "{http.request.host}",
 		"{hostport}", "{http.request.hostport}",
 		"{port}", "{http.request.port}",
+		"{orig_method}", "{http.request.orig_method}",
+		"{orig_uri}", "{http.request.orig_uri}",
+		"{orig_path}", "{http.request.orig_uri.path}",
+		"{orig_dir}", "{http.request.orig_uri.path.dir}",
+		"{orig_file}", "{http.request.orig_uri.path.file}",
+		"{orig_query}", "{http.request.orig_uri.query}",
+		"{orig_?query}", "{http.request.orig_uri.prefixed_query}",
 		"{method}", "{http.request.method}",
+		"{uri}", "{http.request.uri}",
 		"{path}", "{http.request.uri.path}",
+		"{dir}", "{http.request.uri.path.dir}",
+		"{file}", "{http.request.uri.path.file}",
 		"{query}", "{http.request.uri.query}",
+		"{?query}", "{http.request.uri.prefixed_query}",
 		"{remote}", "{http.request.remote}",
 		"{remote_host}", "{http.request.remote.host}",
 		"{remote_port}", "{http.request.remote.port}",
 		"{scheme}", "{http.request.scheme}",
-		"{uri}", "{http.request.uri}",
 		"{uuid}", "{http.request.uuid}",
 		"{tls_cipher}", "{http.request.tls.cipher_suite}",
 		"{tls_version}", "{http.request.tls.version}",

caddytest/integration/caddyfile_adapt/php_fastcgi_expanded_form.caddyfiletest

@@ -8,7 +8,7 @@ route {
 		}
 		not path */
 	}
-	redir @canonicalPath {http.request.orig_uri.path}/ 308
+	redir @canonicalPath {orig_path}/{orig_?query} 308
 
 	# If the requested file does not exist, try index files
 	@indexFiles {
@@ -17,7 +17,7 @@ route {
 			split_path .php
 		}
 	}
-	rewrite @indexFiles {http.matchers.file.relative}
+	rewrite @indexFiles {file_match.relative}
 
 	# Proxy PHP files to the FastCGI responder
 	@phpFiles {
@@ -50,7 +50,7 @@ route {
 													"handler": "static_response",
 													"headers": {
 														"Location": [
-															"{http.request.orig_uri.path}/"
+															"{http.request.orig_uri.path}/{http.request.orig_uri.prefixed_query}"
 														]
 													},
 													"status_code": 308

caddytest/integration/caddyfile_adapt/php_fastcgi_handle_response.caddyfiletest

@@ -42,7 +42,7 @@
 									"handler": "static_response",
 									"headers": {
 										"Location": [
-											"{http.request.orig_uri.path}/"
+											"{http.request.orig_uri.path}/{http.request.orig_uri.prefixed_query}"
 										]
 									},
 									"status_code": 308

caddytest/integration/caddyfile_adapt/php_fastcgi_matcher.caddyfiletest

@@ -33,7 +33,7 @@ php_fastcgi @test localhost:9000
 																	"handler": "static_response",
 																	"headers": {
 																		"Location": [
-																			"{http.request.orig_uri.path}/"
+																			"{http.request.orig_uri.path}/{http.request.orig_uri.prefixed_query}"
 																		]
 																	},
 																	"status_code": 308

caddytest/integration/caddyfile_adapt/php_fastcgi_subdirectives.caddyfiletest

@@ -43,7 +43,7 @@ php_fastcgi localhost:9000 {
 									"handler": "static_response",
 									"headers": {
 										"Location": [
-											"{http.request.orig_uri.path}/"
+											"{http.request.orig_uri.path}/{http.request.orig_uri.prefixed_query}"
 										]
 									},
 									"status_code": 308

caddytest/integration/caddyfile_adapt/php_fastcgi_try_files_override.caddyfiletest

@@ -46,7 +46,7 @@ php_fastcgi localhost:9000 {
 									"handler": "static_response",
 									"headers": {
 										"Location": [
-											"{http.request.orig_uri.path}/"
+											"{http.request.orig_uri.path}/{http.request.orig_uri.prefixed_query}"
 										]
 									},
 									"status_code": 308

modules/caddyhttp/replacer.go

@@ -186,6 +186,11 @@ func addHTTPVarsToReplacer(repl *caddy.Replacer, req *http.Request, w http.Respo
 				return path.Ext(req.URL.Path), true
 			case "http.request.uri.query":
 				return req.URL.RawQuery, true
+			case "http.request.uri.prefixed_query":
+				if req.URL.RawQuery == "" {
+					return "", true
+				}
+				return "?" + req.URL.RawQuery, true
 			case "http.request.duration":
 				start := GetVar(req.Context(), "start_time").(time.Time)
 				return time.Since(start), true
@@ -239,6 +244,12 @@ func addHTTPVarsToReplacer(repl *caddy.Replacer, req *http.Request, w http.Respo
 			case "http.request.orig_uri.query":
 				or, _ := req.Context().Value(OriginalRequestCtxKey).(http.Request)
 				return or.URL.RawQuery, true
+			case "http.request.orig_uri.prefixed_query":
+				or, _ := req.Context().Value(OriginalRequestCtxKey).(http.Request)
+				if or.URL.RawQuery == "" {
+					return "", true
+				}
+				return "?" + or.URL.RawQuery, true
 			}
 
 			// remote IP range/prefix (e.g. keep top 24 bits of 1.2.3.4  => "1.2.3.0/24")

modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go

@@ -343,7 +343,7 @@ func parsePHPFastCGI(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error
 			}
 			redirHandler := caddyhttp.StaticResponse{
 				StatusCode: caddyhttp.WeakString(strconv.Itoa(http.StatusPermanentRedirect)),
-				Headers:    http.Header{"Location": []string{"{http.request.orig_uri.path}/"}},
+				Headers:    http.Header{"Location": []string{"{http.request.orig_uri.path}/{http.request.orig_uri.prefixed_query}"}},
 			}
 			redirRoute := caddyhttp.Route{
 				MatcherSetsRaw: []caddy.ModuleMap{redirMatcherSet},