Add ir_ modifier (#759)

* rewrite: add 'ir_' mod to support header only url-rewriting with no content rewriting
* tests: add tests for ir_ to test that content is identical to id_, but Location headers are rewritten with ir_ modifier.

pywb/rewrite/content_rewriter.py

@@ -524,7 +524,7 @@ class RewriteInfo(object):
         if not self.text_type:
             return False
 
-        if self.url_rewriter.wburl.mod == 'id_':
+        if self.is_identity():
             return False
 
         if self.url_rewriter.rewrite_opts.get('is_ajax'):
@@ -537,9 +537,11 @@ class RewriteInfo(object):
 
         return True
 
+    def is_identity(self):
+        return self.url_rewriter.wburl.mod in ('id_', 'ir_')
+
     def is_url_rw(self):
         if self.url_rewriter.wburl.mod in ('id_', 'bn_', 'wkrf_'):
             return False
 
         return True
-

pywb/rewrite/default_rewriter.py

@@ -102,6 +102,7 @@ class DefaultRewriter(BaseContentRewriter):
         super(DefaultRewriter, self).__init__(rules_file, replay_mod)
         self.all_rewriters = copy.copy(self.DEFAULT_REWRITERS)
 
+        self.add_prefer_mod('raw', 'ir_')
         self.add_prefer_mod('raw', 'id_')
         self.add_prefer_mod('banner-only', 'bn_')
         self.add_prefer_mod('rewritten', replay_mod)

tests/test_integration.py

@@ -138,7 +138,19 @@ class TestWbIntegration(BaseConfigTest):
 
     def test_replay_redirect(self, fmod):
         resp = self.get('/pywb/2014{0}/http://www.iana.org/domains/example', fmod)
-        assert resp.headers['Location'].startswith('/pywb/2014{0}/'.format(fmod))
+        assert resp.headers['Location'] == '/pywb/2014{0}/http://www.iana.org/domains/reserved'.format(fmod)
+        assert resp.status_code == 302
+
+    def test_replay_redirect_id(self):
+        resp = self.get('/pywb/2014id_/http://www.iana.org/domains/example', fmod)
+        print(resp.headers['Location'])
+        assert resp.headers['Location'] == '/domains/reserved'
+        assert resp.status_code == 302
+
+    def test_replay_redirect_ir(self):
+        resp = self.get('/pywb/2014ir_/http://www.iana.org/domains/example', fmod)
+        print(resp.headers['Location'])
+        assert resp.headers['Location'] == '/pywb/2014ir_/http://www.iana.org/domains/reserved'
         assert resp.status_code == 302
 
     def test_replay_fuzzy_1(self, fmod):
@@ -224,6 +236,17 @@ class TestWbIntegration(BaseConfigTest):
         # original unrewritten url present
         assert '"http://www.iana.org/domains/example"' in resp.text
 
+    def test_replay_identity_1_ir(self):
+        resp = self.testapp.get('/pywb/20140127171251ir_/http://example.com/')
+
+        # no wb header insertion
+        assert 'wombat.js' not in resp.text
+
+        assert resp.content_length == 1270, resp.content_length
+
+        # original unrewritten url present
+        assert '"http://www.iana.org/domains/example"' in resp.text
+
     def test_replay_identity_2_arcgz(self):
         resp = self.testapp.get('/pywb/20140216050221id_/http://arc.gz.test.example.com/')