3 from twisted.web import http, server
4 from twisted.python import log
5 from zope.interface import Interface
6 from nevow import loaders, appserver
7 from nevow.inevow import IRequest
8 from nevow.util import resource_filename
9 from allmydata import blacklist
10 from allmydata.interfaces import ExistingChildError, NoSuchChildError, \
11 FileTooLargeError, NotEnoughSharesError, NoSharesError, \
12 EmptyPathnameComponentError, MustBeDeepImmutableError, \
13 MustBeReadonlyError, MustNotBeUnknownRWError, SDMF_VERSION, MDMF_VERSION
14 from allmydata.mutable.common import UnrecoverableFileError
15 from allmydata.util import abbreviate
16 from allmydata.util.encodingutil import to_str, quote_output
19 TIME_FORMAT = "%H:%M:%S %d-%b-%Y"
21 def get_filenode_metadata(filenode):
22 metadata = {'mutable': filenode.is_mutable()}
23 if metadata['mutable']:
24 mutable_type = filenode.get_version()
25 assert mutable_type in (SDMF_VERSION, MDMF_VERSION)
26 if mutable_type == MDMF_VERSION:
32 metadata['format'] = file_format
33 size = filenode.get_size()
35 metadata['size'] = size
38 class IOpHandleTable(Interface):
42 return loaders.xmlfile(resource_filename('allmydata.web', '%s' % name))
44 def boolean_of_arg(arg):
46 if arg.lower() not in ("true", "t", "1", "false", "f", "0", "on", "off"):
47 raise WebError("invalid boolean argument: %r" % (arg,), http.BAD_REQUEST)
48 return arg.lower() in ("true", "t", "1", "on")
50 def parse_replace_arg(replace):
51 if replace.lower() == "only-files":
54 return boolean_of_arg(replace)
56 raise WebError("invalid replace= argument: %r" % (replace,), http.BAD_REQUEST)
59 def get_format(req, default="CHK"):
60 arg = get_arg(req, "format", None)
62 if boolean_of_arg(get_arg(req, "mutable", "false")):
65 if arg.upper() == "CHK":
67 elif arg.upper() == "SDMF":
69 elif arg.upper() == "MDMF":
72 raise WebError("Unknown format: %s, I know CHK, SDMF, MDMF" % arg,
75 def get_mutable_type(file_format): # accepts result of get_format()
76 if file_format == "SDMF":
78 elif file_format == "MDMF":
81 # this is also used to identify which formats are mutable. Use
82 # if get_mutable_type(file_format) is not None:
89 def parse_offset_arg(offset):
90 # XXX: This will raise a ValueError when invoked on something that
91 # is not an integer. Is that okay? Or do we want a better error
92 # message? Since this call is going to be used by programmers and
93 # their tools rather than users (through the wui), it is not
94 # inconsistent to return that, I guess.
95 if offset is not None:
101 def get_root(ctx_or_req):
102 req = IRequest(ctx_or_req)
103 # the addSlash=True gives us one extra (empty) segment
104 depth = len(req.prepath) + len(req.postpath) - 1
105 link = "/".join([".."] * depth)
108 def get_arg(ctx_or_req, argname, default=None, multiple=False):
109 """Extract an argument from either the query args (req.args) or the form
110 body fields (req.fields). If multiple=False, this returns a single value
111 (or the default, which defaults to None), and the query args take
112 precedence. If multiple=True, this returns a tuple of arguments (possibly
113 empty), starting with all those in the query args.
115 req = IRequest(ctx_or_req)
117 if argname in req.args:
118 results.extend(req.args[argname])
119 if req.fields and argname in req.fields:
120 results.append(req.fields[argname].value)
122 return tuple(results)
127 def convert_children_json(nodemaker, children_json):
128 """I convert the JSON output of GET?t=json into the dict-of-nodes input
129 to both dirnode.create_subdirectory() and
130 client.create_directory(initial_children=). This is used by
131 t=mkdir-with-children and t=mkdir-immutable"""
134 data = simplejson.loads(children_json)
135 for (namex, (ctype, propdict)) in data.iteritems():
136 namex = unicode(namex)
137 writecap = to_str(propdict.get("rw_uri"))
138 readcap = to_str(propdict.get("ro_uri"))
139 metadata = propdict.get("metadata", {})
140 # name= argument is just for error reporting
141 childnode = nodemaker.create_from_cap(writecap, readcap, name=namex)
142 children[namex] = (childnode, metadata)
145 def abbreviate_time(data):
146 # 1.23s, 790ms, 132us
151 return abbreviate.abbreviate_time(data)
155 return "%.0fms" % (1000*s)
157 return "%.1fms" % (1000*s)
158 return "%.0fus" % (1000000*s)
160 def compute_rate(bytes, seconds):
164 if seconds is None or seconds == 0:
167 # negative values don't make sense here
171 return 1.0 * bytes / seconds
173 def abbreviate_rate(data):
174 # 21.8kBps, 554.4kBps 4.37MBps
179 return "%1.2fMBps" % (r/1000000)
181 return "%.1fkBps" % (r/1000)
184 def abbreviate_size(data):
185 # 21.8kB, 554.4kB 4.37MB
190 return "%1.2fGB" % (r/1000000000)
192 return "%1.2fMB" % (r/1000000)
194 return "%.1fkB" % (r/1000)
197 def plural(sequence_or_length):
198 if isinstance(sequence_or_length, int):
199 length = sequence_or_length
201 length = len(sequence_or_length)
206 def text_plain(text, ctx):
208 req.setHeader("content-type", "text/plain")
209 req.setHeader("content-length", b"%d" % len(text))
212 class WebError(Exception):
213 def __init__(self, text, code=http.BAD_REQUEST):
217 # XXX: to make UnsupportedMethod return 501 NOT_IMPLEMENTED instead of 500
218 # Internal Server Error, we either need to do that ICanHandleException trick,
219 # or make sure that childFactory returns a WebErrorResource (and never an
220 # actual exception). The latter is growing increasingly annoying.
222 def should_create_intermediate_directories(req):
223 t = get_arg(req, "t", "").strip()
224 return bool(req.method in ("PUT", "POST") and
225 t not in ("delete", "rename", "rename-form", "check"))
227 def humanize_failure(f):
228 # return text, responsecode
229 if f.check(EmptyPathnameComponentError):
230 return ("The webapi does not allow empty pathname components, "
231 "i.e. a double slash", http.BAD_REQUEST)
232 if f.check(ExistingChildError):
233 return ("There was already a child by that name, and you asked me "
234 "to not replace it.", http.CONFLICT)
235 if f.check(NoSuchChildError):
236 quoted_name = quote_output(f.value.args[0], encoding="utf-8", quotemarks=False)
237 return ("No such child: %s" % quoted_name, http.NOT_FOUND)
238 if f.check(NotEnoughSharesError):
239 t = ("NotEnoughSharesError: This indicates that some "
240 "servers were unavailable, or that shares have been "
241 "lost to server departure, hard drive failure, or disk "
242 "corruption. You should perform a filecheck on "
243 "this object to learn more.\n\nThe full error message is:\n"
245 return (t, http.GONE)
246 if f.check(NoSharesError):
247 t = ("NoSharesError: no shares could be found. "
248 "Zero shares usually indicates a corrupt URI, or that "
249 "no servers were connected, but it might also indicate "
250 "severe corruption. You should perform a filecheck on "
251 "this object to learn more.\n\nThe full error message is:\n"
253 return (t, http.GONE)
254 if f.check(UnrecoverableFileError):
255 t = ("UnrecoverableFileError: the directory (or mutable file) could "
256 "not be retrieved, because there were insufficient good shares. "
257 "This might indicate that no servers were connected, "
258 "insufficient servers were connected, the URI was corrupt, or "
259 "that shares have been lost due to server departure, hard drive "
260 "failure, or disk corruption. You should perform a filecheck on "
261 "this object to learn more.")
262 return (t, http.GONE)
263 if f.check(MustNotBeUnknownRWError):
264 quoted_name = quote_output(f.value.args[1], encoding="utf-8")
265 immutable = f.value.args[2]
267 t = ("MustNotBeUnknownRWError: an operation to add a child named "
268 "%s to a directory was given an unknown cap in a write slot.\n"
269 "If the cap is actually an immutable readcap, then using a "
270 "webapi server that supports a later version of Tahoe may help.\n\n"
271 "If you are using the webapi directly, then specifying an immutable "
272 "readcap in the read slot (ro_uri) of the JSON PROPDICT, and "
273 "omitting the write slot (rw_uri), would also work in this "
274 "case.") % quoted_name
276 t = ("MustNotBeUnknownRWError: an operation to add a child named "
277 "%s to a directory was given an unknown cap in a write slot.\n"
278 "Using a webapi server that supports a later version of Tahoe "
280 "If you are using the webapi directly, specifying a readcap in "
281 "the read slot (ro_uri) of the JSON PROPDICT, as well as a "
282 "writecap in the write slot if desired, would also work in this "
283 "case.") % quoted_name
284 return (t, http.BAD_REQUEST)
285 if f.check(MustBeDeepImmutableError):
286 quoted_name = quote_output(f.value.args[1], encoding="utf-8")
287 t = ("MustBeDeepImmutableError: a cap passed to this operation for "
288 "the child named %s, needed to be immutable but was not. Either "
289 "the cap is being added to an immutable directory, or it was "
290 "originally retrieved from an immutable directory as an unknown "
291 "cap.") % quoted_name
292 return (t, http.BAD_REQUEST)
293 if f.check(MustBeReadonlyError):
294 quoted_name = quote_output(f.value.args[1], encoding="utf-8")
295 t = ("MustBeReadonlyError: a cap passed to this operation for "
296 "the child named '%s', needed to be read-only but was not. "
297 "The cap is being passed in a read slot (ro_uri), or was retrieved "
298 "from a read slot as an unknown cap.") % quoted_name
299 return (t, http.BAD_REQUEST)
300 if f.check(blacklist.FileProhibited):
301 t = "Access Prohibited: %s" % quote_output(f.value.reason, encoding="utf-8", quotemarks=False)
302 return (t, http.FORBIDDEN)
303 if f.check(WebError):
304 return (f.value.text, f.value.code)
305 if f.check(FileTooLargeError):
306 return (f.getTraceback(), http.REQUEST_ENTITY_TOO_LARGE)
307 return (str(f), None)
309 class MyExceptionHandler(appserver.DefaultExceptionHandler):
310 def simple(self, ctx, text, code=http.BAD_REQUEST):
312 req.setResponseCode(code)
313 #req.responseHeaders.setRawHeaders("content-encoding", [])
314 #req.responseHeaders.setRawHeaders("content-disposition", [])
315 req.setHeader("content-type", "text/plain;charset=utf-8")
316 if isinstance(text, unicode):
317 text = text.encode("utf-8")
318 req.setHeader("content-length", b"%d" % len(text))
320 # TODO: consider putting the requested URL here
321 req.finishRequest(False)
323 def renderHTTP_exception(self, ctx, f):
325 text, code = humanize_failure(f)
327 log.msg("exception in humanize_failure")
328 log.msg("argument was %s" % (f,))
330 text, code = str(f), None
332 return self.simple(ctx, text, code)
333 if f.check(server.UnsupportedMethod):
334 # twisted.web.server.Request.render() has support for transforming
335 # this into an appropriate 501 NOT_IMPLEMENTED or 405 NOT_ALLOWED
336 # return code, but nevow does not.
339 return self.simple(ctx,
340 "I don't know how to treat a %s request." % method,
341 http.NOT_IMPLEMENTED)
343 accept = req.getHeader("accept")
346 if "*/*" in accept or "text/*" in accept or "text/html" in accept:
347 super = appserver.DefaultExceptionHandler
348 return super.renderHTTP_exception(self, ctx, f)
350 traceback = f.getTraceback()
351 return self.simple(ctx, traceback, http.INTERNAL_SERVER_ERROR)
353 class NeedOperationHandleError(WebError):
358 def renderHTTP(self, ctx):
359 request = IRequest(ctx)
361 # if we were using regular twisted.web Resources (and the regular
362 # twisted.web.server.Request object) then we could implement
363 # render_PUT and render_GET. But Nevow's request handler
364 # (NevowRequest.gotPageContext) goes directly to renderHTTP. Copy
365 # some code from the Resource.render method that Nevow bypasses, to
367 m = getattr(self, 'render_' + request.method, None)
369 from twisted.web.server import UnsupportedMethod
370 raise UnsupportedMethod(getattr(self, 'allowedMethods', ()))