Synnefo

# Copyright 2011-2012 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from dbworker import DBWorker

from pithos.backends.random_word import get_word

class Public(DBWorker):

    """Paths can be marked as public."""

    def __init__(self, **params):

        DBWorker.__init__(self, **params)

        execute = self.execute

        execute(""" create table if not exists public

                          ( public_id integer primary key autoincrement,

                            path      text not null,

                            active    boolean not null default 1,

                            url       text) """)

        execute(""" create unique index if not exists idx_public_path

                    on public(path) """)

        execute(""" create unique index if not exists idx_public_url

                    on public(url) """)

    def get_unique_url(self, serial, public_url_min_length, public_url_alphabet):

        l = public_url_min_length

        while 1:

            candidate = get_word(serial, length=l, alphabet=public_url_alphabet)

            if self.public_path(candidate) is None:

                return candidate

            l +=1

    def public_set(self, path, public_url_min_length, public_url_alphabet):

        q = "select public_id from public where path = ?"

        self.execute(q, (path,))

        row = self.fetchone()

        if not row:

            q = "insert into public(path, active) values(?, ?)"

            serial = self.execute(q, (path, active)).lastrowid

            url = self.get_unique_url(

                serial, public_url_min_length, public_url_alphabet

            )

            q = "update public set url=url where public_id = ?"

            self.execute(q, (serial,))

    def public_unset(self, path):

        q = "delete from public where path = ?"

        self.execute(q, (path,))

    def public_unset_bulk(self, paths):

        placeholders = ','.join('?' for path in paths)

        q = "delete from public where path in (%s)"

        self.execute(q, paths)

    def public_get(self, path):

        q = "select url from public where path = ? and active = 1"

        self.execute(q, (path,))

        row = self.fetchone()

        if row:

            return row[0]

        return None

    def public_list(self, prefix):

        q = "select path, url from public where path like ? escape '\\' and active = 1"

        self.execute(q, (self.escape_like(prefix) + '%',))

        return self.fetchall()

    def public_path(self, public):

        q = "select path from public where url = ? and active = 1"

        self.execute(q, (public,))

        row = self.fetchone()

        if row:

            return row[0]

        return None