1 files changed, 319 insertions, 0 deletions
diff --git a/httpfs/__init__.py b/httpfs/__init__.py
new file mode 100644
index 0000000..f7d7ec3
--- /dev/null
+++ b/httpfs/__init__.py
@@ -0,0 +1,319 @@
+#!/usr/bin/env python3
+import os
+import sys
+import time
+import netrc
+import logging
+import logging.config
+from urllib.parse import quote, unquote
+from email.utils import parsedate
+from html.parser import HTMLParser
+from stat import S_IFDIR, S_IFREG
+from errno import EIO, ENOENT, EBADF, EHOSTUNREACH
+
+import fuse
+import requests
+
+
+class Config(object):
+    mountpoint = None
+    timeout = (5, 25)  # connect_timeout, read_timeout
+    verify = None
+
+
+class Path:
+    def __init__(self, parent, name):
+        self.parent = parent
+        self.name = name
+        self.initialized = False
+
+    def buildUrl(self):
+        return self.parent.buildUrl() + "/" + quote(self.name)
+
+    def getSession(self):
+        return self.parent.getSession()
+
+    def getAttr(self):
+        raise fuse.FuseOSError(ENOENT)
+
+    @classmethod
+    def fromPath(clazz, parent, pathElement):
+        p = clazz(parent, unquote(pathElement))
+        if (pathElement == ""):
+            raise SystemExit(1)
+        logging.info("created {} '{}' referencing {}".format(
+            clazz.__name__, p.name, p.buildUrl()))
+        return p
+
+
+class File(Path):
+    def __init__(self, parent, name):
+        super().__init__(parent, name)
+        self.lastModified = None
+        self.size = None
+
+    def init(self):
+        url = self.buildUrl()
+        logging.info("File url={} name={}".format(url, self.name))
+        r = self.getSession().head(url, timeout=Config.timeout)
+        r.close()
+        if r.status_code != 200:
+            error = "Status code != 200 for {}: {}".format(url, r.status_code)
+            raise Exception(error)
+        self.size = int(r.headers['content-length'])
+        self.lastModified = time.mktime(parsedate(r.headers['last-modified']))
+
+        logging.info("File initialized url={} name={}".format(url, self.name))
+        self.initialized = True
+
+    def get(self, size, offset):
+        if not self.initialized:
+            self.init()
+        url = self.buildUrl()
+        bytesRange = '{}-{}'.format(offset, min(self.size, offset+size-1))
+        headers = {'range': 'bytes=' + bytesRange}
+        logging.info("File.get url={} range={}".format(url, bytesRange))
+        r = self.getSession().get(url, headers=headers, timeout=Config.timeout)
+        r.close()
+        if r.status_code == 200 or r.status_code == 206:
+            d = r.content
+            logging.info("Received {} bytes".format(len(d)))
+            if len(d) > size:
+                errormsg = "size {} > than expected {}".format(len(d), size)
+                logging.error(errormsg)
+                raise fuse.FuseOSError(EIO)
+            return d
+        else:
+            raise fuse.FuseOSError(EIO)
+
+    def getAttr(self):
+        if not self.initialized:
+            self.init()
+        t = self.lastModified
+        return dict(st_mode=(S_IFREG | 0o444), st_nlink=1, st_size=self.size,
+                    st_ctime=t, st_mtime=t, st_atime=t)
+
+
+class Directory(Path):
+    def __init__(self, parent, name):
+        super().__init__(parent, name)
+        self.entries = {}
+
+    def init(self):
+        url = self.buildUrl()
+        logging.info("Directory url={} name={}".format(url, self.name))
+        r = self.getSession().get(url, stream=True, timeout=Config.timeout)
+        if r.status_code != 200:
+            raise Exception("Status code not 200 for {}: {}".format(
+                url, r.status_code))
+
+        if "text/html" not in r.headers['content-type']:
+            raise Exception("Is not text/html: {}".format(url))
+
+        parser = RelativeLinkCollector(self)
+        for line in r.iter_content(decode_unicode=True):
+            parser.feed(line)
+            self.entries.update(parser.entries)
+            parser.entries.clear()
+        parser.close()
+        self.entries.update(parser.entries)
+        r.close()
+
+        logging.info("Diretory loaded {}".format(url))
+        self.initialized = True
+
+    def getAttr(self):
+        t = time.time()
+        nentries = 1
+        if self.initialized:
+            nentries += len(self.entries)
+        return dict(st_mode=(S_IFDIR | 0o555), st_nlink=nentries,
+                    st_ctime=t, st_mtime=t, st_atime=t)
+
+
+class Server(Directory):
+    def __init__(self, parent, name):
+        super().__init__(parent, name)
+        self.session = requests.Session()
+        self.session.verify = Config.verify
+
+    def getSession(self):
+        return self.session
+
+    def buildUrl(self):
+        return self.parent.buildUrl() + "/" + self.name
+
+
+class Schema(Directory):
+    def __init__(self, parent, name):
+        super().__init__(parent, name)
+        self.initialized = True
+
+    def buildUrl(self):
+        return self.name + ":/"
+
+
+class Root(Directory):
+    def __init__(self):
+        super().__init__(None, "")
+        self.initialized = True
+
+    def buildUrl(self):
+        return ""
+
+
+class RelativeLinkCollector(HTMLParser):
+    def __init__(self, parent):
+        super().__init__(self, convert_charrefs=True)
+        self.parent = parent
+        self.entries = {}
+
+    def handle_starttag(self, tag, attrs):
+        if tag == "a":
+            attrs = dict(attrs)
+            if "href" in attrs:
+                href = attrs["href"]
+                if "/" in href[:-1] or href[0] == ".":
+                    return
+
+                if href[-1:] == "/":
+                    d = Directory.fromPath(self.parent, href[:-1])
+                    self.entries[unquote(href[:-1])] = d
+                else:
+                    f = File.fromPath(self.parent, href)
+                    self.entries[unquote(href)] = f
+
+
+class Httpfs(fuse.LoggingMixIn, fuse.Operations):
+    """A read only http/https/ftp filesystem using python-requests."""
+    def __init__(self):
+        self.root = Root()
+
+        https = Schema(self.root, 'https')
+        https.entries = dict(self._getDefaultEntries(https))
+        http = Schema(self.root, 'http')
+        http.entries = dict(self._getDefaultEntries(http))
+
+        self.root.entries = {'http': http, 'https': https}
+
+    def _getDefaultEntries(self, parent):
+        try:
+            for machine in netrc.netrc().hosts.keys():
+                yield (machine, Server(parent, machine))
+        except IOError as e:
+            logging.warn("No .netrc file found, no default machines")
+
+    def getattr(self, path, fh=None):
+        logging.info("getattr path={}".format(path))
+        try:
+            entry = self._getPath(path)
+            if entry:
+                return entry.getAttr()
+        except Exception as e:
+            logging.error("Error", e)
+            raise fuse.FuseOSError(EHOSTUNREACH)
+        raise fuse.FuseOSError(ENOENT)
+
+    def _getPath(self, path):
+        """ map path to self.root tree
+        a path is build like /<schema>/<server hostname>/<http-path>"""
+        logging.debug("getPath path={}".format(path))
+        if path == "/":
+            return self.root
+
+        if path[-1] == "/":
+            path = path[:-1]
+
+        schema, *p = path[1:].split("/")
+        if schema not in self.root.entries:
+            return None
+        prevEntry = self.root.entries[schema]
+        if p == []:
+            return prevEntry
+
+        server, *p = p
+        if server not in prevEntry.entries:
+            # create server if not exists
+            prevEntry.entries[server] = Server.fromPath(prevEntry, server)
+        prevEntry = prevEntry.entries[server]
+        if p == []:
+            return prevEntry
+
+        *pathElements, lastElement = p
+        for pathElement in pathElements:
+            if pathElement not in prevEntry.entries:
+                d = Directory.fromPath(prevEntry, pathElement)
+                prevEntry.entries[pathElement] = d
+            prevEntry = prevEntry.entries[pathElement]
+
+        if lastElement not in prevEntry.entries:
+            if not prevEntry.initialized:
+                prevEntry.init()
+            if lastElement not in prevEntry.entries:
+                # the server don't return it, then just create it
+                # assuming its an directory, if a HEAD is successful
+                d = Directory.fromPath(prevEntry, lastElement)
+                r = d.getSession().head(d.buildUrl(),
+                                        timeout=Config.timeout)
+                if r.status_code == 200:
+                    logging.info("Create directory for path which was not " +
+                                 "discovered by Index of: {}".format(path))
+                    prevEntry.entries[lastElement] = d
+                else:
+                    logging.info("Path not found: {}".format(path))
+                    return None
+        return prevEntry.entries[lastElement]
+
+    def readdir(self, path, fh):
+        logging.info("readdir path=%s", path)
+        entry = self._getPath(path)
+        if not entry:
+            raise fuse.FuseOSError(EBADF)
+        if not entry.initialized:
+            entry.init()
+        return [(".", entry.getAttr(), 0),
+                ("..", (entry.parent and entry.parent.getAttr() or None), 0)] \
+            + [(it.name, it.getAttr(), 0) for it in entry.entries.values()]
+
+    def read(self, path, size, offset, fh):
+        entry = self._getPath(path)
+        if isinstance(entry, File):
+            return entry.get(size, offset)
+        else:
+            raise fuse.FuseOSError(EIO)
+
+if __name__ == '__main__':
+    import argparse
+    FORMAT = "%(threadName)s %(asctime)-15s %(levelname)s:%(name)s %(message)s"
+    logging.basicConfig(level=logging.INFO, format=FORMAT)
+
+    p = argparse.ArgumentParser(
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+    p.add_argument("mountpoint", nargs=1, help="Target directory")
+    p.add_argument("--max_background", type=int, default=15,
+                   help="Maximum number of background threads")
+    p.add_argument("--no_foreground", action="store_true", default=False,
+                   help="Fork into background as a daemon")
+    p.add_argument("--debug", action="store_true", help="Enable fuse debug")
+    p.add_argument("--nothreads", action="store_true",
+                   help="Disable fuse threads")
+    p.add_argument("--connect_timeout", type=int, default=Config.timeout[0],
+                   help="HTTP connect timeout")
+    p.add_argument("--read_timeout", type=int, default=Config.timeout[1],
+                   help="HTTP read timeout")
+    p.add_argument("--no-verify", action="store_true",
+                   help="Disable ssl verify")
+
+    args = vars(p.parse_args(sys.argv[1:]))
+
+    Config.timeout = (args.pop("connect_timeout"), args.pop("read_timeout"))
+    Config.mountpoint = args.pop("mountpoint")[0]
+    Config.verify = not args.pop("no_verify")
+    kwargs = {}
+    if not args.pop("no_foreground"):
+        kwargs["foreground"] = True
+    if args.pop("debug"):
+        kwargs["debug"] = True
+    kwargs.update(args)
+
+    fuse = fuse.FUSE(Httpfs(), Config.mountpoint, **kwargs)