From e35ff9bcddd7819b5110cfeb9acf2e727063090e Mon Sep 17 00:00:00 2001
From: defanor <defanor@uberspace.net>
Date: Mon, 6 Jan 2020 04:00:52 +0300
Subject: Check web page headers

Don't try to render non-(X)HTML documents.
---
 src/browserbox.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/browserbox.c b/src/browserbox.c
index dd3a043..595afb3 100644
--- a/src/browserbox.c
+++ b/src/browserbox.c
@@ -1296,7 +1296,6 @@ void got_headers(SoupMessage *msg, gpointer ptr)
 {
   BrowserBox *bb = ptr;
   browser_box_set_status(bb, "Got headers");
-  /* todo: check content type, don't assume HTML */
   if (bb->builder_state != NULL) {
     if (bb->builder_state->docbox != NULL) {
       gtk_widget_destroy(GTK_WIDGET(bb->builder_state->docbox));
@@ -1308,6 +1307,18 @@ void got_headers(SoupMessage *msg, gpointer ptr)
   char *uri_str = soup_uri_to_string(bb->builder_state->uri, FALSE);
   gtk_entry_set_text(GTK_ENTRY(bb->address_bar), uri_str);
   free(uri_str);
+
+  SoupMessageHeaders *smh;
+  g_object_get(msg,
+               "response-headers", &smh,
+               NULL);
+  const char *ct = soup_message_headers_get_content_type(smh, NULL);
+  if (! (strcmp(ct, "text/html") == 0 ||
+         strcmp(ct, "application/xhtml+xml") == 0)) {
+    browser_box_set_status(bb, "Unsupported content type");
+    /* todo: offer to download a file */
+    bb->builder_state->active = FALSE;
+  }
 }
 
 void document_request_sm (BrowserBox *bb, SoupMessage *sm)
-- 
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