fileserver: Don't assume len(str) == len(ToLower(str)) (fix #3623)

We can't use a positional index on an original string that we got from
its lower-cased equivalent. Implement our own IndexFold() function b/c
the std lib does not have one.

1 files changed, 39 insertions, 24 deletions

diff --git a/modules/caddyhttp/fileserver/matcher_test.go b/modules/caddyhttp/fileserver/matcher_test.go
index aa84900..e3f2911 100644
--- a/modules/caddyhttp/fileserver/matcher_test.go
+++ b/modules/caddyhttp/fileserver/matcher_test.go
@@ -22,69 +22,84 @@ import (
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
 )
 
-func TestPhpFileMatcher(t *testing.T) {
-
+func TestPHPFileMatcher(t *testing.T) {
 	for i, tc := range []struct {
-		path string
+		path         string
 		expectedPath string
-		matched bool
+		matched      bool
 	}{
 		{
-			path: "/index.php",
+			path:         "/index.php",
 			expectedPath: "/index.php",
-			matched: true,
+			matched:      true,
 		},
 		{
-			path: "/index.php/somewhere",
+			path:         "/index.php/somewhere",
 			expectedPath: "/index.php",
-			matched: true,
+			matched:      true,
 		},
 		{
-			path: "/remote.php",
+			path:         "/remote.php",
 			expectedPath: "/remote.php",
-			matched: true,
+			matched:      true,
 		},
 		{
-			path: "/remote.php/somewhere",
+			path:         "/remote.php/somewhere",
 			expectedPath: "/remote.php",
-			matched: true,
+			matched:      true,
 		},
 		{
-			path: "/missingfile.php",
+			path:    "/missingfile.php",
 			matched: false,
 		},
 		{
-			path: "/notphp.php.txt",
+			path:         "/notphp.php.txt",
 			expectedPath: "/notphp.php.txt",
-			matched: true,
+			matched:      true,
 		},
 		{
-			path: "/notphp.php.txt/",
+			path:         "/notphp.php.txt/",
 			expectedPath: "/notphp.php.txt",
-			matched: true,
+			matched:      true,
 		},
 		{
-			path: "/notphp.php.txt.suffixed",
+			path:    "/notphp.php.txt.suffixed",
 			matched: false,
 		},
 		{
-			path: "/foo.php.php/index.php",
+			path:         "/foo.php.php/index.php",
 			expectedPath: "/foo.php.php/index.php",
-			matched: true,
+			matched:      true,
+		},
+		{
+			path:         "/foo.php.PHP/index.php",
+			expectedPath: "/foo.php.PHP/index.php",
+			matched:      true,
+		},
+		{
+			// See https://github.com/caddyserver/caddy/issues/3623
+			path:         "/%E2%C3",
+			expectedPath: "/%E2%C3",
+			matched:      false,
 		},
 	} {
 		m := &MatchFile{
 			Root:      "./testdata",
-			TryFiles:  []string{"{http.request.uri.path}"},
+			TryFiles:  []string{"{http.request.uri.path}", "{http.request.uri.path}/index.php"},
 			SplitPath: []string{".php"},
 		}
 
-		req := &http.Request{URL: &url.URL{Path: tc.path}}
+		u, err := url.Parse(tc.path)
+		if err != nil {
+			t.Fatalf("Test %d: parsing path: %v", i, err)
+		}
+
+		req := &http.Request{URL: u}
 		repl := caddyhttp.NewTestReplacer(req)
 
 		result := m.Match(req)
 		if result != tc.matched {
-			t.Fatalf("Test %d: match bool result: %v, expected: %v", i, result, tc.matched)
+			t.Fatalf("Test %d: expected match=%t, got %t", i, tc.matched, result)
 		}
 
 		rel, ok := repl.Get("http.matchers.file.relative")
@@ -99,4 +114,4 @@ func TestPhpFileMatcher(t *testing.T) {
 			t.Fatalf("Test %d: actual path: %v, expected: %v", i, rel, tc.expectedPath)
 		}
 	}
-}
\ No newline at end of file
+}