Fix the discrepancy between SendBaseModeWeb and Web objects' separate cur_history_id attibutes, ensuring that when we call web.error404() we send a new history_id integer for communicating back to the frontend. Add tests for this

onionshare/web/send_base_mode.py

@@ -29,6 +29,9 @@ class SendBaseModeWeb:
         # one download at a time.
         self.download_in_progress = False
 
+        # This tracks the history id
+        self.cur_history_id = 0
+
         self.define_routes()
         self.init()
 
@@ -264,4 +267,4 @@ class SendBaseModeWeb:
         """
         Inherited class will implement this.
         """
-        pass
+        pass

onionshare/web/share_mode.py

@@ -207,11 +207,15 @@ class ShareModeWeb(SendBaseModeWeb):
                 if self.download_individual_files:
                     return self.stream_individual_file(filesystem_path)
                 else:
-                    return self.web.error404()
+                    history_id = self.cur_history_id
+                    self.cur_history_id += 1
+                    return self.web.error404(history_id)
 
             # If it's not a directory or file, throw a 404
             else:
-                return self.web.error404()
+                history_id = self.cur_history_id
+                self.cur_history_id += 1
+                return self.web.error404(history_id)
         else:
             # Special case loading /
 
@@ -223,7 +227,9 @@ class ShareModeWeb(SendBaseModeWeb):
 
             else:
                 # If the path isn't found, throw a 404
-                return self.web.error404()
+                history_id = self.cur_history_id
+                self.cur_history_id += 1
+                return self.web.error404(history_id)
 
     def build_zipfile_list(self, filenames, processed_size_callback=None):
         self.common.log("ShareModeWeb", "build_zipfile_list")

onionshare/web/web.py

@@ -63,9 +63,6 @@ class Web:
         self.auth = HTTPBasicAuth()
         self.auth.error_handler(self.error401)
 
-        # This tracks the history id
-        self.cur_history_id = 0
-
         # Verbose mode?
         if self.common.verbose:
             self.verbose_mode()
@@ -204,9 +201,7 @@ class Web:
         r = make_response(render_template('403.html', static_url_path=self.static_url_path), 403)
         return self.add_security_headers(r)
 
-    def error404(self):
-        history_id = self.cur_history_id
-        self.cur_history_id += 1
+    def error404(self, history_id):
         self.add_request(self.REQUEST_INDIVIDUAL_FILE_STARTED, '{}'.format(request.path), {
             'id': history_id,
             'status_code': 404