webish: split out 'unlinked' operations

[tahoe-lafs/tahoe-lafs.git] / src / allmydata / web / common.py

diff --git a/src/allmydata/web/common.py b/src/allmydata/web/common.py
index 7a72d6acc58ea40bf0cff0176052825b6738d2bb..8f97dde50a16b42b31c86a9ec94c6747dfa44295 100644 (file)
--- a/src/allmydata/web/common.py
+++ b/src/allmydata/web/common.py
@@ -1,6 +1,33 @@
 
 from zope.interface import Interface
+from nevow import loaders
+from nevow.util import resource_filename
 
 class IClient(Interface):
     pass
 
+
+def getxmlfile(name):
+    return loaders.xmlfile(resource_filename('allmydata.web', '%s' % name))
+
+def boolean_of_arg(arg):
+    assert arg.lower() in ("true", "t", "1", "false", "f", "0", "on", "off")
+    return arg.lower() in ("true", "t", "1", "on")
+
+def get_arg(req, argname, default=None, multiple=False):
+    """Extract an argument from either the query args (req.args) or the form
+    body fields (req.fields). If multiple=False, this returns a single value
+    (or the default, which defaults to None), and the query args take
+    precedence. If multiple=True, this returns a tuple of arguments (possibly
+    empty), starting with all those in the query args.
+    """
+    results = []
+    if argname in req.args:
+        results.extend(req.args[argname])
+    if req.fields and argname in req.fields:
+        results.append(req.fields[argname].value)
+    if multiple:
+        return tuple(results)
+    if results:
+        return results[0]
+    return default