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 if filenode.get_size() is not None:
34 metadata['size'] = filenode.get_size()
37 class IOpHandleTable(Interface):
41 return loaders.xmlfile(resource_filename('allmydata.web', '%s' % name))
43 def boolean_of_arg(arg):
45 if arg.lower() not in ("true", "t", "1", "false", "f", "0", "on", "off"):
46 raise WebError("invalid boolean argument: %r" % (arg,), http.BAD_REQUEST)
47 return arg.lower() in ("true", "t", "1", "on")
49 def parse_replace_arg(replace):
50 if replace.lower() == "only-files":
53 return boolean_of_arg(replace)
55 raise WebError("invalid replace= argument: %r" % (replace,), http.BAD_REQUEST)
58 def get_format(req, default="CHK"):
59 arg = get_arg(req, "format", None)
61 if boolean_of_arg(get_arg(req, "mutable", "false")):
64 if arg.upper() == "CHK":
66 elif arg.upper() == "SDMF":
68 elif arg.upper() == "MDMF":
71 raise WebError("Unknown format: %s, I know CHK, SDMF, MDMF" % arg,
74 def get_mutable_type(file_format): # accepts result of get_format()
75 if file_format == "SDMF":
77 elif file_format == "MDMF":
80 # this is also used to identify which formats are mutable. Use
81 # if get_mutable_type(file_format) is not None:
88 def parse_offset_arg(offset):
89 # XXX: This will raise a ValueError when invoked on something that
90 # is not an integer. Is that okay? Or do we want a better error
91 # message? Since this call is going to be used by programmers and
92 # their tools rather than users (through the wui), it is not
93 # inconsistent to return that, I guess.
94 if offset is not None:
100 def get_root(ctx_or_req):
101 req = IRequest(ctx_or_req)
102 # the addSlash=True gives us one extra (empty) segment
103 depth = len(req.prepath) + len(req.postpath) - 1
104 link = "/".join([".."] * depth)
107 def get_arg(ctx_or_req, argname, default=None, multiple=False):
108 """Extract an argument from either the query args (req.args) or the form
109 body fields (req.fields). If multiple=False, this returns a single value
110 (or the default, which defaults to None), and the query args take
111 precedence. If multiple=True, this returns a tuple of arguments (possibly
112 empty), starting with all those in the query args.
114 req = IRequest(ctx_or_req)
116 if argname in req.args:
117 results.extend(req.args[argname])
118 if req.fields and argname in req.fields:
119 results.append(req.fields[argname].value)
121 return tuple(results)
126 def convert_children_json(nodemaker, children_json):
127 """I convert the JSON output of GET?t=json into the dict-of-nodes input
128 to both dirnode.create_subdirectory() and
129 client.create_directory(initial_children=). This is used by
130 t=mkdir-with-children and t=mkdir-immutable"""
133 data = simplejson.loads(children_json)
134 for (namex, (ctype, propdict)) in data.iteritems():
135 namex = unicode(namex)
136 writecap = to_str(propdict.get("rw_uri"))
137 readcap = to_str(propdict.get("ro_uri"))
138 metadata = propdict.get("metadata", {})
139 # name= argument is just for error reporting
140 childnode = nodemaker.create_from_cap(writecap, readcap, name=namex)
141 children[namex] = (childnode, metadata)
144 def abbreviate_time(data):
145 # 1.23s, 790ms, 132us
150 return abbreviate.abbreviate_time(data)
154 return "%.0fms" % (1000*s)
156 return "%.1fms" % (1000*s)
157 return "%.0fus" % (1000000*s)
159 def compute_rate(bytes, seconds):
163 if seconds is None or seconds == 0:
166 # negative values don't make sense here
170 return 1.0 * bytes / seconds
172 def abbreviate_rate(data):
173 # 21.8kBps, 554.4kBps 4.37MBps
178 return "%1.2fMBps" % (r/1000000)
180 return "%.1fkBps" % (r/1000)
183 def abbreviate_size(data):
184 # 21.8kB, 554.4kB 4.37MB
189 return "%1.2fGB" % (r/1000000000)
191 return "%1.2fMB" % (r/1000000)
193 return "%.1fkB" % (r/1000)
196 def plural(sequence_or_length):
197 if isinstance(sequence_or_length, int):
198 length = sequence_or_length
200 length = len(sequence_or_length)
205 def text_plain(text, ctx):
207 req.setHeader("content-type", "text/plain")
208 req.setHeader("content-length", len(text))
211 class WebError(Exception):
212 def __init__(self, text, code=http.BAD_REQUEST):
216 # XXX: to make UnsupportedMethod return 501 NOT_IMPLEMENTED instead of 500
217 # Internal Server Error, we either need to do that ICanHandleException trick,
218 # or make sure that childFactory returns a WebErrorResource (and never an
219 # actual exception). The latter is growing increasingly annoying.
221 def should_create_intermediate_directories(req):
222 t = get_arg(req, "t", "").strip()
223 return bool(req.method in ("PUT", "POST") and
224 t not in ("delete", "rename", "rename-form", "check"))
226 def humanize_failure(f):
227 # return text, responsecode
228 if f.check(EmptyPathnameComponentError):
229 return ("The webapi does not allow empty pathname components, "
230 "i.e. a double slash", http.BAD_REQUEST)
231 if f.check(ExistingChildError):
232 return ("There was already a child by that name, and you asked me "
233 "to not replace it.", http.CONFLICT)
234 if f.check(NoSuchChildError):
235 quoted_name = quote_output(f.value.args[0], encoding="utf-8", quotemarks=False)
236 return ("No such child: %s" % quoted_name, http.NOT_FOUND)
237 if f.check(NotEnoughSharesError):
238 t = ("NotEnoughSharesError: This indicates that some "
239 "servers were unavailable, or that shares have been "
240 "lost to server departure, hard drive failure, or disk "
241 "corruption. You should perform a filecheck on "
242 "this object to learn more.\n\nThe full error message is:\n"
244 return (t, http.GONE)
245 if f.check(NoSharesError):
246 t = ("NoSharesError: no shares could be found. "
247 "Zero shares usually indicates a corrupt URI, or that "
248 "no servers were connected, but it might also indicate "
249 "severe corruption. You should perform a filecheck on "
250 "this object to learn more.\n\nThe full error message is:\n"
252 return (t, http.GONE)
253 if f.check(UnrecoverableFileError):
254 t = ("UnrecoverableFileError: the directory (or mutable file) could "
255 "not be retrieved, because there were insufficient good shares. "
256 "This might indicate that no servers were connected, "
257 "insufficient servers were connected, the URI was corrupt, or "
258 "that shares have been lost due to server departure, hard drive "
259 "failure, or disk corruption. You should perform a filecheck on "
260 "this object to learn more.")
261 return (t, http.GONE)
262 if f.check(MustNotBeUnknownRWError):
263 quoted_name = quote_output(f.value.args[1], encoding="utf-8")
264 immutable = f.value.args[2]
266 t = ("MustNotBeUnknownRWError: an operation to add a child named "
267 "%s to a directory was given an unknown cap in a write slot.\n"
268 "If the cap is actually an immutable readcap, then using a "
269 "webapi server that supports a later version of Tahoe may help.\n\n"
270 "If you are using the webapi directly, then specifying an immutable "
271 "readcap in the read slot (ro_uri) of the JSON PROPDICT, and "
272 "omitting the write slot (rw_uri), would also work in this "
273 "case.") % quoted_name
275 t = ("MustNotBeUnknownRWError: an operation to add a child named "
276 "%s to a directory was given an unknown cap in a write slot.\n"
277 "Using a webapi server that supports a later version of Tahoe "
279 "If you are using the webapi directly, specifying a readcap in "
280 "the read slot (ro_uri) of the JSON PROPDICT, as well as a "
281 "writecap in the write slot if desired, would also work in this "
282 "case.") % quoted_name
283 return (t, http.BAD_REQUEST)
284 if f.check(MustBeDeepImmutableError):
285 quoted_name = quote_output(f.value.args[1], encoding="utf-8")
286 t = ("MustBeDeepImmutableError: a cap passed to this operation for "
287 "the child named %s, needed to be immutable but was not. Either "
288 "the cap is being added to an immutable directory, or it was "
289 "originally retrieved from an immutable directory as an unknown "
290 "cap.") % quoted_name
291 return (t, http.BAD_REQUEST)
292 if f.check(MustBeReadonlyError):
293 quoted_name = quote_output(f.value.args[1], encoding="utf-8")
294 t = ("MustBeReadonlyError: a cap passed to this operation for "
295 "the child named '%s', needed to be read-only but was not. "
296 "The cap is being passed in a read slot (ro_uri), or was retrieved "
297 "from a read slot as an unknown cap.") % quoted_name
298 return (t, http.BAD_REQUEST)
299 if f.check(blacklist.FileProhibited):
300 t = "Access Prohibited: %s" % quote_output(f.value.reason, encoding="utf-8", quotemarks=False)
301 return (t, http.FORBIDDEN)
302 if f.check(WebError):
303 return (f.value.text, f.value.code)
304 if f.check(FileTooLargeError):
305 return (f.getTraceback(), http.REQUEST_ENTITY_TOO_LARGE)
306 return (str(f), None)
308 class MyExceptionHandler(appserver.DefaultExceptionHandler):
309 def simple(self, ctx, text, code=http.BAD_REQUEST):
311 req.setResponseCode(code)
312 #req.responseHeaders.setRawHeaders("content-encoding", [])
313 #req.responseHeaders.setRawHeaders("content-disposition", [])
314 req.setHeader("content-type", "text/plain;charset=utf-8")
315 if isinstance(text, unicode):
316 text = text.encode("utf-8")
317 req.setHeader("content-length", str(len(text)))
319 # TODO: consider putting the requested URL here
320 req.finishRequest(False)
322 def renderHTTP_exception(self, ctx, f):
324 text, code = humanize_failure(f)
326 log.msg("exception in humanize_failure")
327 log.msg("argument was %s" % (f,))
329 text, code = str(f), None
331 return self.simple(ctx, text, code)
332 if f.check(server.UnsupportedMethod):
333 # twisted.web.server.Request.render() has support for transforming
334 # this into an appropriate 501 NOT_IMPLEMENTED or 405 NOT_ALLOWED
335 # return code, but nevow does not.
338 return self.simple(ctx,
339 "I don't know how to treat a %s request." % method,
340 http.NOT_IMPLEMENTED)
342 accept = req.getHeader("accept")
345 if "*/*" in accept or "text/*" in accept or "text/html" in accept:
346 super = appserver.DefaultExceptionHandler
347 return super.renderHTTP_exception(self, ctx, f)
349 traceback = f.getTraceback()
350 return self.simple(ctx, traceback, http.INTERNAL_SERVER_ERROR)
352 class NeedOperationHandleError(WebError):
357 def renderHTTP(self, ctx):
358 request = IRequest(ctx)
360 # if we were using regular twisted.web Resources (and the regular
361 # twisted.web.server.Request object) then we could implement
362 # render_PUT and render_GET. But Nevow's request handler
363 # (NevowRequest.gotPageContext) goes directly to renderHTTP. Copy
364 # some code from the Resource.render method that Nevow bypasses, to
366 m = getattr(self, 'render_' + request.method, None)
368 from twisted.web.server import UnsupportedMethod
369 raise UnsupportedMethod(getattr(self, 'allowedMethods', ()))