From ca09caa15dd34e0cb3e6c3419dd2db8d90c9c2ad Mon Sep 17 00:00:00 2001
From: Ben Kurtovic <ben.kurtovic@gmail.com>
Date: Mon, 14 Jul 2014 01:44:50 -0400
Subject: [PATCH] Give an error when no text could be found inside a URL.

---
 copyvios/checker.py  | 6 +++++-
 templates/index.mako | 4 ++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/copyvios/checker.py b/copyvios/checker.py
index fe27f86..5f8c169 100644
--- a/copyvios/checker.py
+++ b/copyvios/checker.py
@@ -41,7 +41,11 @@ def _get_results(query):
         if urlparse(query.url).scheme not in ["http", "https"]:
             query.error = "bad URI"
             return
-        query.result = page.copyvio_compare(query.url)
+        result = page.copyvio_compare(query.url)
+        if result.source_chain is page.EMPTY:
+            query.error = "no data"
+            return
+        query.result = result
         query.result.cached = False
     else:
         conn = get_cache_db()
diff --git a/templates/index.mako b/templates/index.mako
index 150d839..bd7d2fe 100644
--- a/templates/index.mako
+++ b/templates/index.mako
@@ -7,6 +7,10 @@
         <div id="info-box" class="red-box">
             <p>Unsupported URI scheme: <a href="${query.url | h}">${query.url | h}</a>.</p>
         </div>
+    % elif query.error == "no data":
+        <div id="info-box" class="red-box">
+            <p>Couldn't find any text in <a href="${query.url | h}">${query.url | h}</a>. <i>Note:</i> only HTML and plain text pages are supported, and content generated by JavaScript or found inside iframes is ignored.</p>
+        </div>
     % elif not query.site:
         <div id="info-box" class="red-box">
             <p>The given site (project=<b><span class="mono">${query.project | h}</span></b>, language=<b><span class="mono">${query.lang | h}</span></b>) doesn't seem to exist. It may also be closed or private. <a href="//${query.lang | h}.${query.project | h}.org/">Confirm its URL.</a></p>