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Initial Commit
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Tim
commit
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378
lib/cherrypy/lib/static.py
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378
lib/cherrypy/lib/static.py
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import os
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import re
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import stat
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import mimetypes
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try:
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from io import UnsupportedOperation
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except ImportError:
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UnsupportedOperation = object()
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import cherrypy
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from cherrypy._cpcompat import ntob, unquote
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from cherrypy.lib import cptools, httputil, file_generator_limited
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mimetypes.init()
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mimetypes.types_map['.dwg'] = 'image/x-dwg'
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mimetypes.types_map['.ico'] = 'image/x-icon'
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mimetypes.types_map['.bz2'] = 'application/x-bzip2'
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mimetypes.types_map['.gz'] = 'application/x-gzip'
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def serve_file(path, content_type=None, disposition=None, name=None,
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debug=False):
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"""Set status, headers, and body in order to serve the given path.
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The Content-Type header will be set to the content_type arg, if provided.
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If not provided, the Content-Type will be guessed by the file extension
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of the 'path' argument.
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If disposition is not None, the Content-Disposition header will be set
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to "<disposition>; filename=<name>". If name is None, it will be set
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to the basename of path. If disposition is None, no Content-Disposition
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header will be written.
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"""
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response = cherrypy.serving.response
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# If path is relative, users should fix it by making path absolute.
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# That is, CherryPy should not guess where the application root is.
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# It certainly should *not* use cwd (since CP may be invoked from a
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# variety of paths). If using tools.staticdir, you can make your relative
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# paths become absolute by supplying a value for "tools.staticdir.root".
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if not os.path.isabs(path):
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msg = "'%s' is not an absolute path." % path
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if debug:
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cherrypy.log(msg, 'TOOLS.STATICFILE')
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raise ValueError(msg)
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try:
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st = os.stat(path)
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except OSError:
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if debug:
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cherrypy.log('os.stat(%r) failed' % path, 'TOOLS.STATIC')
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raise cherrypy.NotFound()
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# Check if path is a directory.
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if stat.S_ISDIR(st.st_mode):
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# Let the caller deal with it as they like.
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if debug:
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cherrypy.log('%r is a directory' % path, 'TOOLS.STATIC')
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raise cherrypy.NotFound()
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# Set the Last-Modified response header, so that
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# modified-since validation code can work.
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response.headers['Last-Modified'] = httputil.HTTPDate(st.st_mtime)
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cptools.validate_since()
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if content_type is None:
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# Set content-type based on filename extension
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ext = ""
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i = path.rfind('.')
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if i != -1:
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ext = path[i:].lower()
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content_type = mimetypes.types_map.get(ext, None)
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if content_type is not None:
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response.headers['Content-Type'] = content_type
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if debug:
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cherrypy.log('Content-Type: %r' % content_type, 'TOOLS.STATIC')
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cd = None
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if disposition is not None:
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if name is None:
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name = os.path.basename(path)
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cd = '%s; filename="%s"' % (disposition, name)
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response.headers["Content-Disposition"] = cd
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if debug:
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cherrypy.log('Content-Disposition: %r' % cd, 'TOOLS.STATIC')
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# Set Content-Length and use an iterable (file object)
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# this way CP won't load the whole file in memory
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content_length = st.st_size
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fileobj = open(path, 'rb')
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return _serve_fileobj(fileobj, content_type, content_length, debug=debug)
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def serve_fileobj(fileobj, content_type=None, disposition=None, name=None,
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debug=False):
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"""Set status, headers, and body in order to serve the given file object.
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The Content-Type header will be set to the content_type arg, if provided.
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If disposition is not None, the Content-Disposition header will be set
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to "<disposition>; filename=<name>". If name is None, 'filename' will
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not be set. If disposition is None, no Content-Disposition header will
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be written.
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CAUTION: If the request contains a 'Range' header, one or more seek()s will
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be performed on the file object. This may cause undesired behavior if
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the file object is not seekable. It could also produce undesired results
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if the caller set the read position of the file object prior to calling
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serve_fileobj(), expecting that the data would be served starting from that
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position.
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"""
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response = cherrypy.serving.response
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try:
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st = os.fstat(fileobj.fileno())
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except AttributeError:
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if debug:
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cherrypy.log('os has no fstat attribute', 'TOOLS.STATIC')
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content_length = None
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except UnsupportedOperation:
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content_length = None
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else:
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# Set the Last-Modified response header, so that
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# modified-since validation code can work.
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response.headers['Last-Modified'] = httputil.HTTPDate(st.st_mtime)
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cptools.validate_since()
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content_length = st.st_size
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if content_type is not None:
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response.headers['Content-Type'] = content_type
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if debug:
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cherrypy.log('Content-Type: %r' % content_type, 'TOOLS.STATIC')
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cd = None
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if disposition is not None:
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if name is None:
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cd = disposition
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else:
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cd = '%s; filename="%s"' % (disposition, name)
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response.headers["Content-Disposition"] = cd
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if debug:
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cherrypy.log('Content-Disposition: %r' % cd, 'TOOLS.STATIC')
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return _serve_fileobj(fileobj, content_type, content_length, debug=debug)
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def _serve_fileobj(fileobj, content_type, content_length, debug=False):
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"""Internal. Set response.body to the given file object, perhaps ranged."""
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response = cherrypy.serving.response
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# HTTP/1.0 didn't have Range/Accept-Ranges headers, or the 206 code
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request = cherrypy.serving.request
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if request.protocol >= (1, 1):
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response.headers["Accept-Ranges"] = "bytes"
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r = httputil.get_ranges(request.headers.get('Range'), content_length)
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if r == []:
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response.headers['Content-Range'] = "bytes */%s" % content_length
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message = ("Invalid Range (first-byte-pos greater than "
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"Content-Length)")
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if debug:
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cherrypy.log(message, 'TOOLS.STATIC')
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raise cherrypy.HTTPError(416, message)
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if r:
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if len(r) == 1:
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# Return a single-part response.
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start, stop = r[0]
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if stop > content_length:
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stop = content_length
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r_len = stop - start
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if debug:
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cherrypy.log(
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'Single part; start: %r, stop: %r' % (start, stop),
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'TOOLS.STATIC')
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response.status = "206 Partial Content"
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response.headers['Content-Range'] = (
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"bytes %s-%s/%s" % (start, stop - 1, content_length))
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response.headers['Content-Length'] = r_len
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fileobj.seek(start)
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response.body = file_generator_limited(fileobj, r_len)
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else:
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# Return a multipart/byteranges response.
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response.status = "206 Partial Content"
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try:
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# Python 3
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from email.generator import _make_boundary as make_boundary
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except ImportError:
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# Python 2
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from mimetools import choose_boundary as make_boundary
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boundary = make_boundary()
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ct = "multipart/byteranges; boundary=%s" % boundary
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response.headers['Content-Type'] = ct
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if "Content-Length" in response.headers:
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# Delete Content-Length header so finalize() recalcs it.
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del response.headers["Content-Length"]
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def file_ranges():
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# Apache compatibility:
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yield ntob("\r\n")
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for start, stop in r:
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if debug:
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cherrypy.log(
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'Multipart; start: %r, stop: %r' % (
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start, stop),
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'TOOLS.STATIC')
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yield ntob("--" + boundary, 'ascii')
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yield ntob("\r\nContent-type: %s" % content_type,
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'ascii')
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yield ntob(
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"\r\nContent-range: bytes %s-%s/%s\r\n\r\n" % (
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start, stop - 1, content_length),
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'ascii')
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fileobj.seek(start)
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gen = file_generator_limited(fileobj, stop - start)
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for chunk in gen:
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yield chunk
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yield ntob("\r\n")
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# Final boundary
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yield ntob("--" + boundary + "--", 'ascii')
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# Apache compatibility:
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yield ntob("\r\n")
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response.body = file_ranges()
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return response.body
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else:
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if debug:
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cherrypy.log('No byteranges requested', 'TOOLS.STATIC')
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# Set Content-Length and use an iterable (file object)
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# this way CP won't load the whole file in memory
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response.headers['Content-Length'] = content_length
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response.body = fileobj
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return response.body
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def serve_download(path, name=None):
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"""Serve 'path' as an application/x-download attachment."""
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# This is such a common idiom I felt it deserved its own wrapper.
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return serve_file(path, "application/x-download", "attachment", name)
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def _attempt(filename, content_types, debug=False):
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if debug:
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cherrypy.log('Attempting %r (content_types %r)' %
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(filename, content_types), 'TOOLS.STATICDIR')
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try:
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# you can set the content types for a
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# complete directory per extension
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content_type = None
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if content_types:
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r, ext = os.path.splitext(filename)
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content_type = content_types.get(ext[1:], None)
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serve_file(filename, content_type=content_type, debug=debug)
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return True
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except cherrypy.NotFound:
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# If we didn't find the static file, continue handling the
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# request. We might find a dynamic handler instead.
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if debug:
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cherrypy.log('NotFound', 'TOOLS.STATICFILE')
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return False
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def staticdir(section, dir, root="", match="", content_types=None, index="",
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debug=False):
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"""Serve a static resource from the given (root +) dir.
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match
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If given, request.path_info will be searched for the given
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regular expression before attempting to serve static content.
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content_types
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If given, it should be a Python dictionary of
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{file-extension: content-type} pairs, where 'file-extension' is
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a string (e.g. "gif") and 'content-type' is the value to write
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out in the Content-Type response header (e.g. "image/gif").
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index
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If provided, it should be the (relative) name of a file to
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serve for directory requests. For example, if the dir argument is
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'/home/me', the Request-URI is 'myapp', and the index arg is
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'index.html', the file '/home/me/myapp/index.html' will be sought.
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"""
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request = cherrypy.serving.request
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if request.method not in ('GET', 'HEAD'):
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if debug:
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cherrypy.log('request.method not GET or HEAD', 'TOOLS.STATICDIR')
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return False
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if match and not re.search(match, request.path_info):
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if debug:
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cherrypy.log('request.path_info %r does not match pattern %r' %
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(request.path_info, match), 'TOOLS.STATICDIR')
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return False
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# Allow the use of '~' to refer to a user's home directory.
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dir = os.path.expanduser(dir)
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# If dir is relative, make absolute using "root".
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if not os.path.isabs(dir):
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if not root:
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msg = "Static dir requires an absolute dir (or root)."
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if debug:
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cherrypy.log(msg, 'TOOLS.STATICDIR')
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raise ValueError(msg)
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dir = os.path.join(root, dir)
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# Determine where we are in the object tree relative to 'section'
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# (where the static tool was defined).
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if section == 'global':
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section = "/"
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section = section.rstrip(r"\/")
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branch = request.path_info[len(section) + 1:]
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branch = unquote(branch.lstrip(r"\/"))
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# If branch is "", filename will end in a slash
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filename = os.path.join(dir, branch)
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if debug:
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cherrypy.log('Checking file %r to fulfill %r' %
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(filename, request.path_info), 'TOOLS.STATICDIR')
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# There's a chance that the branch pulled from the URL might
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# have ".." or similar uplevel attacks in it. Check that the final
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# filename is a child of dir.
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if not os.path.normpath(filename).startswith(os.path.normpath(dir)):
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raise cherrypy.HTTPError(403) # Forbidden
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handled = _attempt(filename, content_types)
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if not handled:
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# Check for an index file if a folder was requested.
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if index:
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handled = _attempt(os.path.join(filename, index), content_types)
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if handled:
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request.is_index = filename[-1] in (r"\/")
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return handled
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def staticfile(filename, root=None, match="", content_types=None, debug=False):
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"""Serve a static resource from the given (root +) filename.
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match
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If given, request.path_info will be searched for the given
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regular expression before attempting to serve static content.
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content_types
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If given, it should be a Python dictionary of
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{file-extension: content-type} pairs, where 'file-extension' is
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a string (e.g. "gif") and 'content-type' is the value to write
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out in the Content-Type response header (e.g. "image/gif").
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"""
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request = cherrypy.serving.request
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if request.method not in ('GET', 'HEAD'):
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if debug:
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cherrypy.log('request.method not GET or HEAD', 'TOOLS.STATICFILE')
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return False
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if match and not re.search(match, request.path_info):
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if debug:
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cherrypy.log('request.path_info %r does not match pattern %r' %
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(request.path_info, match), 'TOOLS.STATICFILE')
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return False
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# If filename is relative, make absolute using "root".
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if not os.path.isabs(filename):
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if not root:
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msg = "Static tool requires an absolute filename (got '%s')." % (
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filename,)
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if debug:
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cherrypy.log(msg, 'TOOLS.STATICFILE')
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raise ValueError(msg)
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filename = os.path.join(root, filename)
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return _attempt(filename, content_types, debug=debug)
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