src/allmydata/web/directory.py

   1
   2 import simplejson
   3 import urllib
   4 import time
   5
   6 from twisted.internet import defer
   7 from twisted.python.failure import Failure
   8 from twisted.web import http, html
   9 from nevow import url, rend, tags as T
  10 from nevow.inevow import IRequest
  11
  12 from foolscap.eventual import fireEventually
  13
  14 from allmydata.util import log, base32
  15 from allmydata.uri import from_string_verifier, from_string_dirnode, \
  16      CHKFileVerifierURI
  17 from allmydata.interfaces import IDirectoryNode, IFileNode, IMutableFileNode, \
  18      ExistingChildError
  19 from allmydata.web.common import text_plain, WebError, IClient, \
  20      boolean_of_arg, get_arg, should_create_intermediate_directories, \
  21      getxmlfile, RenderMixin
  22 from allmydata.web.filenode import ReplaceMeMixin, \
  23      FileNodeHandler, PlaceHolderNodeHandler
  24
  25 class BlockingFileError(Exception):
  26     # TODO: catch and transform
  27     """We cannot auto-create a parent directory, because there is a file in
  28     the way"""
  29
  30 def make_handler_for(node, parentnode=None, name=None):
  31     if parentnode:
  32         assert IDirectoryNode.providedBy(parentnode)
  33     if IFileNode.providedBy(node):
  34         return FileNodeHandler(node, parentnode, name)
  35     if IMutableFileNode.providedBy(node):
  36         return FileNodeHandler(node, parentnode, name)
  37     if IDirectoryNode.providedBy(node):
  38         return DirectoryNodeHandler(node, parentnode, name)
  39     raise WebError("Cannot provide handler for '%s'" % node)
  40
  41 class DirectoryNodeHandler(RenderMixin, rend.Page, ReplaceMeMixin):
  42     addSlash = True
  43
  44     def __init__(self, node, parentnode=None, name=None):
  45         rend.Page.__init__(self)
  46         assert node
  47         self.node = node
  48         self.parentnode = parentnode
  49         self.name = name
  50
  51     def childFactory(self, ctx, name):
  52         req = IRequest(ctx)
  53         name = name.decode("utf-8")
  54         d = self.node.get(name)
  55         d.addBoth(self.got_child, ctx, name)
  56         # got_child returns a handler resource: FileNodeHandler or
  57         # DirectoryNodeHandler
  58         return d
  59
  60     def got_child(self, node_or_failure, ctx, name):
  61         DEBUG = False
  62         if DEBUG: print "GOT_CHILD", name, node_or_failure
  63         req = IRequest(ctx)
  64         method = req.method
  65         nonterminal = len(req.postpath) > 1
  66         t = get_arg(req, "t", "").strip()
  67         if isinstance(node_or_failure, Failure):
  68             f = node_or_failure
  69             f.trap(KeyError)
  70             # No child by this name. What should we do about it?
  71             if DEBUG: print "no child", name
  72             if DEBUG: print "postpath", req.postpath
  73             if nonterminal:
  74                 if DEBUG: print " intermediate"
  75                 if should_create_intermediate_directories(req):
  76                     # create intermediate directories
  77                     if DEBUG: print " making intermediate directory"
  78                     d = self.node.create_empty_directory(name)
  79                     d.addCallback(make_handler_for, self.node, name)
  80                     return d
  81             else:
  82                 if DEBUG: print " terminal"
  83                 # terminal node
  84                 if (method,t) in [ ("POST","mkdir"), ("PUT","mkdir") ]:
  85                     if DEBUG: print " making final directory"
  86                     # final directory
  87                     d = self.node.create_empty_directory(name)
  88                     d.addCallback(make_handler_for, self.node, name)
  89                     return d
  90                 if (method,t) in ( ("PUT",""), ("PUT","uri"), ):
  91                     if DEBUG: print " PUT, making leaf placeholder"
  92                     # we were trying to find the leaf filenode (to put a new
  93                     # file in its place), and it didn't exist. That's ok,
  94                     # since that's the leaf node that we're about to create.
  95                     # We make a dummy one, which will respond to the PUT
  96                     # request by replacing itself.
  97                     return PlaceHolderNodeHandler(self.node, name)
  98             if DEBUG: print " 404"
  99             # otherwise, we just return a no-such-child error
 100             return rend.FourOhFour()
 101
 102         node = node_or_failure
 103         if nonterminal and should_create_intermediate_directories(req):
 104             if not IDirectoryNode.providedBy(node):
 105                 # we would have put a new directory here, but there was a
 106                 # file in the way.
 107                 if DEBUG: print "blocking"
 108                 raise WebError("Unable to create directory '%s': "
 109                                "a file was in the way" % name,
 110                                http.CONFLICT)
 111         if DEBUG: print "good child"
 112         return make_handler_for(node, self.node, name)
 113
 114     def render_DELETE(self, ctx):
 115         assert self.parentnode and self.name
 116         d = self.parentnode.delete(self.name)
 117         d.addCallback(lambda res: self.node.get_uri())
 118         return d
 119
 120     def render_GET(self, ctx):
 121         client = IClient(ctx)
 122         req = IRequest(ctx)
 123         # This is where all of the directory-related ?t=* code goes.
 124         t = get_arg(req, "t", "").strip()
 125         if not t:
 126             # render the directory as HTML, using the docFactory and Nevow's
 127             # whole templating thing.
 128             return DirectoryAsHTML(self.node)
 129
 130         if t == "json":
 131             return DirectoryJSONMetadata(ctx, self.node)
 132         if t == "uri":
 133             return DirectoryURI(ctx, self.node)
 134         if t == "readonly-uri":
 135             return DirectoryReadonlyURI(ctx, self.node)
 136         if t == "manifest":
 137             return Manifest(self.node)
 138         if t == "deep-size":
 139             return DeepSize(ctx, self.node)
 140         if t == "deep-stats":
 141             return DeepStats(ctx, self.node)
 142         if t == 'rename-form':
 143             return RenameForm(self.node)
 144
 145         raise WebError("GET directory: bad t=%s" % t)
 146
 147     def render_PUT(self, ctx):
 148         req = IRequest(ctx)
 149         t = get_arg(req, "t", "").strip()
 150         replace = boolean_of_arg(get_arg(req, "replace", "true"))
 151         if t == "mkdir":
 152             # our job was done by the traversal/create-intermediate-directory
 153             # process that got us here.
 154             return text_plain(self.node.get_uri(), ctx) # TODO: urlencode
 155         if t == "uri":
 156             if not replace:
 157                 # they're trying to set_uri and that name is already occupied
 158                 # (by us).
 159                 raise ExistingChildError()
 160             d = self.parentnode.replace_me_with_a_childcap(ctx, replace)
 161             # TODO: results
 162             return d
 163
 164         raise WebError("PUT to a directory")
 165
 166     def render_POST(self, ctx):
 167         req = IRequest(ctx)
 168         t = get_arg(req, "t", "").strip()
 169         if t == "mkdir":
 170             d = self._POST_mkdir(req)
 171         elif t == "mkdir-p":
 172             # TODO: docs, tests
 173             d = self._POST_mkdir_p(req)
 174         elif t == "upload":
 175             d = self._POST_upload(ctx) # this one needs the context
 176         elif t == "uri":
 177             d = self._POST_uri(req)
 178         elif t == "delete":
 179             d = self._POST_delete(req)
 180         elif t == "rename":
 181             d = self._POST_rename(req)
 182         elif t == "check":
 183             d = self._POST_check(req)
 184         elif t == "set_children":
 185             # TODO: docs
 186             d = self._POST_set_children(req)
 187         else:
 188             raise WebError("POST to a directory with bad t=%s" % t)
 189
 190         when_done = get_arg(req, "when_done", None)
 191         if when_done:
 192             d.addCallback(lambda res: url.URL.fromString(when_done))
 193         return d
 194
 195     def _POST_mkdir(self, req):
 196         name = get_arg(req, "name", "")
 197         if not name:
 198             # our job is done, it was handled by the code in got_child
 199             # which created the final directory (i.e. us)
 200             return defer.succeed(self.node.get_uri()) # TODO: urlencode
 201         name = name.decode("utf-8")
 202         replace = boolean_of_arg(get_arg(req, "replace", "true"))
 203         d = self.node.create_empty_directory(name, overwrite=replace)
 204         d.addCallback(lambda child: child.get_uri()) # TODO: urlencode
 205         return d
 206
 207     def _POST_mkdir_p(self, req):
 208         path = get_arg(req, "path")
 209         if not path:
 210             raise WebError("mkdir-p requires a path")
 211         path_ = tuple([seg.decode("utf-8") for seg in path.split('/') if seg ])
 212         # TODO: replace
 213         d = self._get_or_create_directories(self.node, path_)
 214         d.addCallback(lambda node: node.get_uri())
 215         return d
 216
 217     def _get_or_create_directories(self, node, path):
 218         if not IDirectoryNode.providedBy(node):
 219             # unfortunately it is too late to provide the name of the
 220             # blocking directory in the error message.
 221             raise BlockingFileError("cannot create directory because there "
 222                                     "is a file in the way")
 223         if not path:
 224             return defer.succeed(node)
 225         d = node.get(path[0])
 226         def _maybe_create(f):
 227             f.trap(KeyError)
 228             return node.create_empty_directory(path[0])
 229         d.addErrback(_maybe_create)
 230         d.addCallback(self._get_or_create_directories, path[1:])
 231         return d
 232
 233     def _POST_upload(self, ctx):
 234         req = IRequest(ctx)
 235         charset = get_arg(req, "_charset", "utf-8")
 236         contents = req.fields["file"]
 237         assert contents.filename is None or isinstance(contents.filename, str)
 238         name = get_arg(req, "name")
 239         name = name or contents.filename
 240         if name is not None:
 241             name = name.strip()
 242         if not name:
 243             # this prohibts empty, missing, and all-whitespace filenames
 244             raise WebError("upload requires a name")
 245         assert isinstance(name, str)
 246         name = name.decode(charset)
 247         if "/" in name:
 248             raise WebError("name= may not contain a slash", http.BAD_REQUEST)
 249         assert isinstance(name, unicode)
 250
 251         # since POST /uri/path/file?t=upload is equivalent to
 252         # POST /uri/path/dir?t=upload&name=foo, just do the same thing that
 253         # childFactory would do. Things are cleaner if we only do a subset of
 254         # them, though, so we don't do: d = self.childFactory(ctx, name)
 255
 256         d = self.node.get(name)
 257         def _maybe_got_node(node_or_failure):
 258             if isinstance(node_or_failure, Failure):
 259                 f = node_or_failure
 260                 f.trap(KeyError)
 261                 # create a placeholder which will see POST t=upload
 262                 return PlaceHolderNodeHandler(self.node, name)
 263             else:
 264                 node = node_or_failure
 265                 return make_handler_for(node, self.node, name)
 266         d.addBoth(_maybe_got_node)
 267         # now we have a placeholder or a filenodehandler, and we can just
 268         # delegate to it. We could return the resource back out of
 269         # DirectoryNodeHandler.renderHTTP, and nevow would recurse into it,
 270         # but the addCallback() that handles when_done= would break.
 271         d.addCallback(lambda child: child.renderHTTP(ctx))
 272         return d
 273
 274     def _POST_uri(self, req):
 275         childcap = get_arg(req, "uri")
 276         if not childcap:
 277             raise WebError("set-uri requires a uri")
 278         name = get_arg(req, "name")
 279         if not name:
 280             raise WebError("set-uri requires a name")
 281         charset = get_arg(req, "_charset", "utf-8")
 282         name = name.decode(charset)
 283         replace = boolean_of_arg(get_arg(req, "replace", "true"))
 284         d = self.node.set_uri(name, childcap, overwrite=replace)
 285         d.addCallback(lambda res: childcap)
 286         return d
 287
 288     def _POST_delete(self, req):
 289         name = get_arg(req, "name")
 290         if name is None:
 291             # apparently an <input type="hidden" name="name" value="">
 292             # won't show up in the resulting encoded form.. the 'name'
 293             # field is completely missing. So to allow deletion of an
 294             # empty file, we have to pretend that None means ''. The only
 295             # downide of this is a slightly confusing error message if
 296             # someone does a POST without a name= field. For our own HTML
 297             # thisn't a big deal, because we create the 'delete' POST
 298             # buttons ourselves.
 299             name = ''
 300         charset = get_arg(req, "_charset", "utf-8")
 301         name = name.decode(charset)
 302         d = self.node.delete(name)
 303         d.addCallback(lambda res: "thing deleted")
 304         return d
 305
 306     def _POST_rename(self, req):
 307         charset = get_arg(req, "_charset", "utf-8")
 308         from_name = get_arg(req, "from_name")
 309         if from_name is not None:
 310             from_name = from_name.strip()
 311             from_name = from_name.decode(charset)
 312             assert isinstance(from_name, unicode)
 313         to_name = get_arg(req, "to_name")
 314         if to_name is not None:
 315             to_name = to_name.strip()
 316             to_name = to_name.decode(charset)
 317             assert isinstance(to_name, unicode)
 318         if not from_name or not to_name:
 319             raise WebError("rename requires from_name and to_name")
 320         for k,v in [ ('from_name', from_name), ('to_name', to_name) ]:
 321             if v and "/" in v:
 322                 raise WebError("%s= may not contain a slash" % k,
 323                                http.BAD_REQUEST)
 324
 325         replace = boolean_of_arg(get_arg(req, "replace", "true"))
 326         d = self.node.move_child_to(from_name, self.node, to_name, replace)
 327         d.addCallback(lambda res: "thing renamed")
 328         return d
 329
 330     def _POST_check(self, req):
 331         # check this directory
 332         d = self.node.check()
 333         def _done(res):
 334             log.msg("checked %s, results %s" % (self.node, res),
 335                     facility="tahoe.webish", level=log.NOISY)
 336             return str(res)
 337         d.addCallback(_done)
 338         # TODO: results
 339         return d
 340
 341     def _POST_set_children(self, req):
 342         replace = boolean_of_arg(get_arg(req, "replace", "true"))
 343         req.content.seek(0)
 344         body = req.content.read()
 345         try:
 346             children = simplejson.loads(body)
 347         except ValueError, le:
 348             le.args = tuple(le.args + (body,))
 349             # TODO test handling of bad JSON
 350             raise
 351         cs = []
 352         for name, (file_or_dir, mddict) in children.iteritems():
 353             cap = str(mddict.get('rw_uri') or mddict.get('ro_uri'))
 354             cs.append((name, cap, mddict.get('metadata')))
 355         d = self.node.set_children(cs, replace)
 356         d.addCallback(lambda res: "Okay so I did it.")
 357         # TODO: results
 358         return d
 359
 360 def abbreviated_dirnode(dirnode):
 361     u = from_string_dirnode(dirnode.get_uri())
 362     si = u.get_filenode_uri().storage_index
 363     si_s = base32.b2a(si)
 364     return si_s[:6]
 365
 366 class DirectoryAsHTML(rend.Page):
 367     # The remainder of this class is to render the directory into
 368     # human+browser -oriented HTML.
 369     docFactory = getxmlfile("directory.xhtml")
 370     addSlash = True
 371
 372     def __init__(self, node):
 373         rend.Page.__init__(self)
 374         self.node = node
 375
 376     def render_title(self, ctx, data):
 377         si_s = abbreviated_dirnode(self.node)
 378         header = ["Directory SI=%s" % si_s]
 379         return ctx.tag[header]
 380
 381     def render_header(self, ctx, data):
 382         si_s = abbreviated_dirnode(self.node)
 383         header = ["Directory SI=%s" % si_s]
 384         if self.node.is_readonly():
 385             header.append(" (readonly)")
 386         return ctx.tag[header]
 387
 388     def get_root(self, ctx):
 389         req = IRequest(ctx)
 390         # the addSlash=True gives us one extra (empty) segment
 391         depth = len(req.prepath) + len(req.postpath) - 1
 392         link = "/".join([".."] * depth)
 393         return link
 394
 395     def render_welcome(self, ctx, data):
 396         link = self.get_root(ctx)
 397         return T.div[T.a(href=link)["Return to Welcome page"]]
 398
 399     def data_children(self, ctx, data):
 400         d = self.node.list()
 401         d.addCallback(lambda dict: sorted(dict.items()))
 402         def _stall_some(items):
 403             # Deferreds don't optimize out tail recursion, and the way
 404             # Nevow's flattener handles Deferreds doesn't take this into
 405             # account. As a result, large lists of Deferreds that fire in the
 406             # same turn (i.e. the output of defer.succeed) will cause a stack
 407             # overflow. To work around this, we insert a turn break after
 408             # every 100 items, using foolscap's fireEventually(). This gives
 409             # the stack a chance to be popped. It would also work to put
 410             # every item in its own turn, but that'd be a lot more
 411             # inefficient. This addresses ticket #237, for which I was never
 412             # able to create a failing unit test.
 413             output = []
 414             for i,item in enumerate(items):
 415                 if i % 100 == 0:
 416                     output.append(fireEventually(item))
 417                 else:
 418                     output.append(item)
 419             return output
 420         d.addCallback(_stall_some)
 421         return d
 422
 423     def render_row(self, ctx, data):
 424         name, (target, metadata) = data
 425         name = name.encode("utf-8")
 426         assert not isinstance(name, unicode)
 427
 428         root = self.get_root(ctx)
 429         here = "%s/uri/%s/" % (root, urllib.quote(self.node.get_uri()))
 430         if self.node.is_readonly():
 431             delete = "-"
 432             rename = "-"
 433         else:
 434             # this creates a button which will cause our child__delete method
 435             # to be invoked, which deletes the file and then redirects the
 436             # browser back to this directory
 437             delete = T.form(action=here, method="post")[
 438                 T.input(type='hidden', name='t', value='delete'),
 439                 T.input(type='hidden', name='name', value=name),
 440                 T.input(type='hidden', name='when_done', value="."),
 441                 T.input(type='submit', value='del', name="del"),
 442                 ]
 443
 444             rename = T.form(action=here, method="get")[
 445                 T.input(type='hidden', name='t', value='rename-form'),
 446                 T.input(type='hidden', name='name', value=name),
 447                 T.input(type='hidden', name='when_done', value="."),
 448                 T.input(type='submit', value='rename', name="rename"),
 449                 ]
 450
 451         ctx.fillSlots("delete", delete)
 452         ctx.fillSlots("rename", rename)
 453         if IDirectoryNode.providedBy(target):
 454             check_url = "%s/uri/%s/" % (root, urllib.quote(target.get_uri()))
 455             check_done_url = "../../uri/%s/" % urllib.quote(self.node.get_uri())
 456         else:
 457             check_url = "%s/uri/%s" % (root, urllib.quote(target.get_uri()))
 458             check_done_url = "../uri/%s/" % urllib.quote(self.node.get_uri())
 459         check = T.form(action=check_url, method="post")[
 460             T.input(type='hidden', name='t', value='check'),
 461             T.input(type='hidden', name='when_done', value=check_done_url),
 462             T.input(type='submit', value='check', name="check"),
 463             ]
 464         ctx.fillSlots("overwrite",
 465                       self.build_overwrite_form(ctx, name, target))
 466         ctx.fillSlots("check", check)
 467
 468         times = []
 469         TIME_FORMAT = "%H:%M:%S %d-%b-%Y"
 470         if "ctime" in metadata:
 471             ctime = time.strftime(TIME_FORMAT,
 472                                   time.localtime(metadata["ctime"]))
 473             times.append("c: " + ctime)
 474         if "mtime" in metadata:
 475             mtime = time.strftime(TIME_FORMAT,
 476                                   time.localtime(metadata["mtime"]))
 477             if times:
 478                 times.append(T.br())
 479                 times.append("m: " + mtime)
 480         ctx.fillSlots("times", times)
 481
 482         assert (IFileNode.providedBy(target)
 483                 or IDirectoryNode.providedBy(target)
 484                 or IMutableFileNode.providedBy(target)), target
 485
 486         quoted_uri = urllib.quote(target.get_uri())
 487
 488         if IMutableFileNode.providedBy(target):
 489             # to prevent javascript in displayed .html files from stealing a
 490             # secret directory URI from the URL, send the browser to a URI-based
 491             # page that doesn't know about the directory at all
 492             dlurl = "%s/file/%s/@@named=/%s" % (root, quoted_uri, urllib.quote(name))
 493
 494             ctx.fillSlots("filename",
 495                           T.a(href=dlurl)[html.escape(name)])
 496             ctx.fillSlots("type", "SSK")
 497
 498             ctx.fillSlots("size", "?")
 499
 500             text_plain_url = "%s/file/%s/@@named=/foo.txt" % (root, quoted_uri)
 501             text_plain_tag = T.a(href=text_plain_url)["text/plain"]
 502
 503         elif IFileNode.providedBy(target):
 504             dlurl = "%s/file/%s/@@named=/%s" % (root, quoted_uri, urllib.quote(name))
 505
 506             ctx.fillSlots("filename",
 507                           T.a(href=dlurl)[html.escape(name)])
 508             ctx.fillSlots("type", "FILE")
 509
 510             ctx.fillSlots("size", target.get_size())
 511
 512             text_plain_url = "%s/file/%s/@@named=/foo.txt" % (root, quoted_uri)
 513             text_plain_tag = T.a(href=text_plain_url)["text/plain"]
 514
 515
 516         elif IDirectoryNode.providedBy(target):
 517             # directory
 518             uri_link = "%s/uri/%s/" % (root, urllib.quote(target.get_uri()))
 519             ctx.fillSlots("filename",
 520                           T.a(href=uri_link)[html.escape(name)])
 521             if target.is_readonly():
 522                 dirtype = "DIR-RO"
 523             else:
 524                 dirtype = "DIR"
 525             ctx.fillSlots("type", dirtype)
 526             ctx.fillSlots("size", "-")
 527             text_plain_tag = None
 528
 529         childdata = [T.a(href="%s?t=json" % name)["JSON"], ", ",
 530                      T.a(href="%s?t=uri" % name)["URI"], ", ",
 531                      T.a(href="%s?t=readonly-uri" % name)["readonly-URI"],
 532                      ]
 533         if text_plain_tag:
 534             childdata.extend([", ", text_plain_tag])
 535
 536         ctx.fillSlots("data", childdata)
 537
 538         try:
 539             checker = IClient(ctx).getServiceNamed("checker")
 540         except KeyError:
 541             checker = None
 542         if checker:
 543             d = defer.maybeDeferred(checker.checker_results_for,
 544                                     target.get_verifier())
 545             def _got(checker_results):
 546                 recent_results = reversed(checker_results[-5:])
 547                 if IFileNode.providedBy(target):
 548                     results = ("[" +
 549                                ", ".join(["%d/%d" % (found, needed)
 550                                           for (when,
 551                                                (needed, total, found, sharemap))
 552                                           in recent_results]) +
 553                                "]")
 554                 elif IDirectoryNode.providedBy(target):
 555                     results = ("[" +
 556                                "".join([{True:"+",False:"-"}[res]
 557                                         for (when, res) in recent_results]) +
 558                                "]")
 559                 else:
 560                     results = "%d results" % len(checker_results)
 561                 return results
 562             d.addCallback(_got)
 563             results = d
 564         else:
 565             results = "--"
 566         # TODO: include a link to see more results, including timestamps
 567         # TODO: use a sparkline
 568         ctx.fillSlots("checker_results", results)
 569
 570         return ctx.tag
 571
 572     def render_forms(self, ctx, data):
 573         if self.node.is_readonly():
 574             return T.div["No upload forms: directory is read-only"]
 575         mkdir = T.form(action=".", method="post",
 576                        enctype="multipart/form-data")[
 577             T.fieldset[
 578             T.input(type="hidden", name="t", value="mkdir"),
 579             T.input(type="hidden", name="when_done", value="."),
 580             T.legend(class_="freeform-form-label")["Create a new directory"],
 581             "New directory name: ",
 582             T.input(type="text", name="name"), " ",
 583             T.input(type="submit", value="Create"),
 584             ]]
 585
 586         upload = T.form(action=".", method="post",
 587                         enctype="multipart/form-data")[
 588             T.fieldset[
 589             T.input(type="hidden", name="t", value="upload"),
 590             T.input(type="hidden", name="when_done", value="."),
 591             T.legend(class_="freeform-form-label")["Upload a file to this directory"],
 592             "Choose a file to upload: ",
 593             T.input(type="file", name="file", class_="freeform-input-file"),
 594             " ",
 595             T.input(type="submit", value="Upload"),
 596             " Mutable?:",
 597             T.input(type="checkbox", name="mutable"),
 598             ]]
 599
 600         mount = T.form(action=".", method="post",
 601                         enctype="multipart/form-data")[
 602             T.fieldset[
 603             T.input(type="hidden", name="t", value="uri"),
 604             T.input(type="hidden", name="when_done", value="."),
 605             T.legend(class_="freeform-form-label")["Attach a file or directory"
 606                                                    " (by URI) to this"
 607                                                    " directory"],
 608             "New child name: ",
 609             T.input(type="text", name="name"), " ",
 610             "URI of new child: ",
 611             T.input(type="text", name="uri"), " ",
 612             T.input(type="submit", value="Attach"),
 613             ]]
 614         return [T.div(class_="freeform-form")[mkdir],
 615                 T.div(class_="freeform-form")[upload],
 616                 T.div(class_="freeform-form")[mount],
 617                 ]
 618
 619     def build_overwrite_form(self, ctx, name, target):
 620         if IMutableFileNode.providedBy(target) and not target.is_readonly():
 621             root = self.get_root(ctx)
 622             action = "%s/uri/%s" % (root, urllib.quote(target.get_uri()))
 623             done_url = "../uri/%s/" % urllib.quote(self.node.get_uri())
 624             overwrite = T.form(action=action, method="post",
 625                                enctype="multipart/form-data")[
 626                 T.fieldset[
 627                 T.input(type="hidden", name="t", value="upload"),
 628                 T.input(type='hidden', name='when_done', value=done_url),
 629                 T.legend(class_="freeform-form-label")["Overwrite"],
 630                 "Choose new file: ",
 631                 T.input(type="file", name="file", class_="freeform-input-file"),
 632                 " ",
 633                 T.input(type="submit", value="Overwrite")
 634                 ]]
 635             return [T.div(class_="freeform-form")[overwrite],]
 636         else:
 637             return []
 638
 639     def render_results(self, ctx, data):
 640         req = IRequest(ctx)
 641         return get_arg(req, "results", "")
 642
 643
 644 def DirectoryJSONMetadata(ctx, dirnode):
 645     d = dirnode.list()
 646     def _got(children):
 647         kids = {}
 648         for name, (childnode, metadata) in children.iteritems():
 649             if childnode.is_readonly():
 650                 rw_uri = None
 651                 ro_uri = childnode.get_uri()
 652             else:
 653                 rw_uri = childnode.get_uri()
 654                 ro_uri = childnode.get_readonly_uri()
 655             if IFileNode.providedBy(childnode):
 656                 kiddata = ("filenode", {'size': childnode.get_size(),
 657                                         'metadata': metadata,
 658                                         })
 659             else:
 660                 assert IDirectoryNode.providedBy(childnode), (childnode,
 661                                                               children,)
 662                 kiddata = ("dirnode", {'metadata': metadata})
 663             if ro_uri:
 664                 kiddata[1]["ro_uri"] = ro_uri
 665             if rw_uri:
 666                 kiddata[1]["rw_uri"] = rw_uri
 667             kiddata[1]['mutable'] = childnode.is_mutable()
 668             kids[name] = kiddata
 669         if dirnode.is_readonly():
 670             drw_uri = None
 671             dro_uri = dirnode.get_uri()
 672         else:
 673             drw_uri = dirnode.get_uri()
 674             dro_uri = dirnode.get_readonly_uri()
 675         contents = { 'children': kids }
 676         if dro_uri:
 677             contents['ro_uri'] = dro_uri
 678         if drw_uri:
 679             contents['rw_uri'] = drw_uri
 680         contents['mutable'] = dirnode.is_mutable()
 681         data = ("dirnode", contents)
 682         return simplejson.dumps(data, indent=1)
 683     d.addCallback(_got)
 684     d.addCallback(text_plain, ctx)
 685     return d
 686
 687 def DirectoryURI(ctx, dirnode):
 688     return text_plain(dirnode.get_uri(), ctx)
 689
 690 def DirectoryReadonlyURI(ctx, dirnode):
 691     return text_plain(dirnode.get_readonly_uri(), ctx)
 692
 693 class RenameForm(rend.Page):
 694     addSlash = True
 695     docFactory = getxmlfile("rename-form.xhtml")
 696
 697     def render_title(self, ctx, data):
 698         return ctx.tag["Directory SI=%s" % abbreviated_dirnode(self.original)]
 699
 700     def render_header(self, ctx, data):
 701         header = ["Rename "
 702                   "in directory SI=%s" % abbreviated_dirnode(self.original),
 703                   ]
 704
 705         if self.original.is_readonly():
 706             header.append(" (readonly!)")
 707         header.append(":")
 708         return ctx.tag[header]
 709
 710     def render_when_done(self, ctx, data):
 711         return T.input(type="hidden", name="when_done", value=".")
 712
 713     def render_get_name(self, ctx, data):
 714         req = IRequest(ctx)
 715         name = get_arg(req, "name", "")
 716         ctx.tag.attributes['value'] = name
 717         return ctx.tag
 718
 719
 720 class Manifest(rend.Page):
 721     docFactory = getxmlfile("manifest.xhtml")
 722
 723     def render_title(self, ctx):
 724         return T.title["Manifest of SI=%s" % abbreviated_dirnode(self.original)]
 725
 726     def render_header(self, ctx):
 727         return T.p["Manifest of SI=%s" % abbreviated_dirnode(self.original)]
 728
 729     def data_items(self, ctx, data):
 730         return self.original.build_manifest()
 731
 732     def render_row(self, ctx, refresh_cap):
 733         ctx.fillSlots("refresh_capability", refresh_cap)
 734         return ctx.tag
 735
 736 def DeepSize(ctx, dirnode):
 737     d = dirnode.build_manifest()
 738     def _measure_size(manifest):
 739         total = 0
 740         for verifiercap in manifest:
 741             u = from_string_verifier(verifiercap)
 742             if isinstance(u, CHKFileVerifierURI):
 743                 total += u.size
 744         return str(total)
 745     d.addCallback(_measure_size)
 746     d.addCallback(text_plain, ctx)
 747     return d
 748
 749 def DeepStats(ctx, dirnode):
 750     d = dirnode.deep_stats()
 751     d.addCallback(simplejson.dumps, indent=1)
 752     d.addCallback(text_plain, ctx)
 753     return d