webapi changes for MDMF

[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 22083a587ebb37aae4680417cf7cd32d3d7a0443..6e90554488bd81cafc140797e628305eaa9149af 100644 (file)
--- a/src/allmydata/web/common.py
+++ b/src/allmydata/web/common.py
@@ -9,7 +9,7 @@ from nevow.util import resource_filename
 from allmydata.interfaces import ExistingChildError, NoSuchChildError, \
      FileTooLargeError, NotEnoughSharesError, NoSharesError, \
      EmptyPathnameComponentError, MustBeDeepImmutableError, \
-     MustBeReadonlyError, MustNotBeUnknownRWError
+     MustBeReadonlyError, MustNotBeUnknownRWError, SDMF_VERSION, MDMF_VERSION
 from allmydata.mutable.common import UnrecoverableFileError
 from allmydata.util import abbreviate
 from allmydata.util.encodingutil import to_str, quote_output
@@ -32,6 +32,32 @@ def parse_replace_arg(replace):
     else:
         return boolean_of_arg(replace)
 
+
+def parse_mutable_type_arg(arg):
+    if not arg:
+        return None # interpreted by the caller as "let the nodemaker decide"
+
+    arg = arg.lower()
+    if arg == "mdmf":
+        return MDMF_VERSION
+    elif arg == "sdmf":
+        return SDMF_VERSION
+
+    return "invalid"
+
+
+def parse_offset_arg(offset):
+    # XXX: This will raise a ValueError when invoked on something that
+    # is not an integer. Is that okay? Or do we want a better error
+    # message? Since this call is going to be used by programmers and
+    # their tools rather than users (through the wui), it is not
+    # inconsistent to return that, I guess.
+    if offset is not None:
+        offset = int(offset)
+
+    return offset
+
+
 def get_root(ctx_or_req):
     req = IRequest(ctx_or_req)
     # the addSlash=True gives us one extra (empty) segment