gfile: Strip query sections from file: URIs

According to https://url.spec.whatwg.org/#file-state
a file URI can have a fragment and query string, so just ignore them
and don't raise an invalid URI error.

Fixes: #3050

gio/glocalvfs.c

@@ -94,14 +94,24 @@ g_local_vfs_get_file_for_uri (GVfs       *vfs,
 {
   char *path;
   GFile *file;
-  char *stripped_uri, *hash;
+  char *stripped_uri, *hash, *question_mark;
 
+  /* As per https://url.spec.whatwg.org/#file-state, file: URIs can contain
+   * query and fragment sections. We ignore them in order to get only the file
+   * path. Compliance to this part of the WhatWG spec doesn’t necessarily mean
+   * we comply with the entire spec. */
   if (strchr (uri, '#') != NULL)
     {
       stripped_uri = g_strdup (uri);
       hash = strchr (stripped_uri, '#');
       *hash = 0;
     }
+  else if (strchr (uri, '?') != NULL)
+    {
+      stripped_uri = g_strdup (uri);
+      question_mark = strchr (stripped_uri, '?');
+      *question_mark = 0;
+    }
   else
     stripped_uri = (char *)uri;
       

gio/tests/file.c

@@ -3935,6 +3935,38 @@ test_enumerator_cancellation (void)
   g_object_unref (dir);
 }
 
+static void
+test_from_uri_ignores_fragment (void)
+{
+  GFile *file;
+  gchar *path;
+  file = g_file_new_for_uri ("file:///tmp/foo#bar");
+  path = g_file_get_path (file);
+#ifdef G_OS_WIN32
+  g_assert_cmpstr (path, ==, "\\tmp\\foo");
+#else
+  g_assert_cmpstr (path, ==, "/tmp/foo");
+#endif
+  g_free (path);
+  g_object_unref (file);
+}
+
+static void
+test_from_uri_ignores_query_string (void)
+{
+  GFile *file;
+  gchar *path;
+  file = g_file_new_for_uri ("file:///tmp/foo?bar");
+  path = g_file_get_path (file);
+#ifdef G_OS_WIN32
+  g_assert_cmpstr (path, ==, "\\tmp\\foo");
+#else
+  g_assert_cmpstr (path, ==, "/tmp/foo");
+#endif
+  g_free (path);
+  g_object_unref (file);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -3990,6 +4022,8 @@ main (int argc, char *argv[])
   g_test_add_func ("/file/query-default-handler-uri", test_query_default_handler_uri);
   g_test_add_func ("/file/query-default-handler-uri-async", test_query_default_handler_uri_async);
   g_test_add_func ("/file/enumerator-cancellation", test_enumerator_cancellation);
+  g_test_add_func ("/file/from-uri/ignores-query-string", test_from_uri_ignores_query_string);
+  g_test_add_func ("/file/from-uri/ignores-fragment", test_from_uri_ignores_fragment);
 
   return g_test_run ();
 }

glib/gconvert.c

@@ -1664,6 +1664,11 @@ hostname_validate (const char *hostname)
  * Converts an escaped ASCII-encoded URI to a local filename in the
  * encoding used for filenames.
  *
+ * Since GLib 2.78, the query string and fragment can be present in the URI,
+ * but are not part of the resulting filename.
+ * We take inspiration from https://url.spec.whatwg.org/#file-state,
+ * but we don't support the entire standard.
+ * 
  * Returns: (type filename): a newly-allocated string holding
  *               the resulting filename, or %NULL on an error.
  **/
@@ -1677,6 +1682,8 @@ g_filename_from_uri (const gchar *uri,
   char *unescaped_hostname;
   char *result;
   char *filename;
+  char *past_path;
+  char *temp_uri;
   int offs;
 #ifdef G_OS_WIN32
   char *p, *slash;
@@ -1693,15 +1700,17 @@ g_filename_from_uri (const gchar *uri,
       return NULL;
     }
 
-  past_scheme = uri + strlen ("file:");
+  temp_uri = g_strdup (uri);
 
-  if (strchr (past_scheme, '#') != NULL)
-    {
-      g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
-		   _("The local file URI “%s” may not include a “#”"),
-		   uri);
-      return NULL;
-    }
+  past_scheme = temp_uri + strlen ("file:");
+  
+  past_path = strchr (past_scheme, '?');
+  if (past_path != NULL)
+    *past_path = '\0';
+
+  past_path = strchr (past_scheme, '#');
+  if (past_path != NULL)
+    *past_path = '\0';
 
   if (has_case_prefix (past_scheme, "///"))
     past_scheme += 2;
@@ -1714,6 +1723,7 @@ g_filename_from_uri (const gchar *uri,
 
       if (past_scheme == NULL)
 	{
+          g_free (temp_uri);
 	  g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
 		       _("The URI “%s” is invalid"),
 		       uri);
@@ -1726,6 +1736,7 @@ g_filename_from_uri (const gchar *uri,
 	  !hostname_validate (unescaped_hostname))
 	{
 	  g_free (unescaped_hostname);
+          g_free (temp_uri);
 	  g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
 		       _("The hostname of the URI “%s” is invalid"),
 		       uri);
@@ -1742,6 +1753,7 @@ g_filename_from_uri (const gchar *uri,
 
   if (filename == NULL)
     {
+      g_free (temp_uri);
       g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
 		   _("The URI “%s” contains invalidly escaped characters"),
 		   uri);
@@ -1785,6 +1797,8 @@ g_filename_from_uri (const gchar *uri,
   result = g_strdup (filename + offs);
   g_free (filename);
 
+  g_free (temp_uri);
+
   return result;
 }
 

glib/tests/convert.c

@@ -949,6 +949,38 @@ test_no_conv (void)
   g_error_free (error);
 }
 
+static void
+test_filename_from_uri_query_is_ignored (void)
+{
+  gchar *filename;
+  GError *error = NULL;
+
+  filename = g_filename_from_uri ("file:///tmp/foo?bar", NULL, &error);
+  g_assert_no_error (error);
+#ifdef G_OS_WIN32
+  g_assert_cmpstr (filename, ==, "\\tmp\\foo");
+#else
+  g_assert_cmpstr (filename, ==, "/tmp/foo");
+#endif
+  g_free (filename);
+}
+
+static void
+test_filename_from_uri_fragment_is_ignored (void)
+{
+  gchar *filename;
+  GError *error = NULL;
+
+  filename = g_filename_from_uri ("file:///tmp/foo#bar", NULL, &error);
+  g_assert_no_error (error);
+#ifdef G_OS_WIN32
+  g_assert_cmpstr (filename, ==, "\\tmp\\foo");
+#else
+  g_assert_cmpstr (filename, ==, "/tmp/foo");
+#endif
+  g_free (filename);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -974,6 +1006,8 @@ main (int argc, char *argv[])
   g_test_add_func ("/conversion/filename-from-utf8/embedded-nul", test_filename_from_utf8_embedded_nul);
   g_test_add_func ("/conversion/filename-from-utf8/embedded-nul/subprocess/utf8", test_filename_from_utf8_embedded_nul_utf8);
   g_test_add_func ("/conversion/filename-from-utf8/embedded-nul/subprocess/iconv", test_filename_from_utf8_embedded_nul_iconv);
+  g_test_add_func ("/conversion/filename-from-uri/query-is-ignored", test_filename_from_uri_query_is_ignored);
+  g_test_add_func ("/conversion/filename-from-uri/fragment-is-ignored", test_filename_from_uri_fragment_is_ignored);
 
   return g_test_run ();
 }

glib/tests/uri.c

@@ -130,7 +130,8 @@ file_from_uri_tests[] = {
   { "file:////etc/%C3%B6%C3%C3%C3%A5", "//etc/\xc3\xb6\xc3\xc3\xc3\xa5", NULL, 0 },
   { "file://\xE5\xE4\xF6/etc", NULL, NULL, G_CONVERT_ERROR_BAD_URI},
   { "file://%E5%E4%F6/etc", NULL, NULL, G_CONVERT_ERROR_BAD_URI},
-  { "file:///some/file#bad", NULL, NULL, G_CONVERT_ERROR_BAD_URI},
+  { "file:///some/file?query", "/some/file", NULL, 0 },
+  { "file:///some/file#bad", "/some/file", NULL, 0 },
   { "file://some", NULL, NULL, G_CONVERT_ERROR_BAD_URI},
   { "", NULL, NULL, G_CONVERT_ERROR_BAD_URI},
   { "file:test", NULL, NULL, G_CONVERT_ERROR_BAD_URI},