# -*- coding: utf-8 -*-
#
# Copyright (C) 2005-2013 Edgewall Software
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://trac.edgewall.org/wiki/TracLicense.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://trac.edgewall.org/log/.

from __future__ import with_statement

import os
from StringIO import StringIO
import tempfile
import unittest

from trac.attachment import Attachment, AttachmentModule
from trac.core import Component, implements, TracError
from trac.perm import IPermissionPolicy, PermissionCache
from trac.resource import IResourceManager, Resource, resource_exists
from trac.test import EnvironmentStub, MockRequest
from trac.web.api import HTTPBadRequest


hashes = {
    '42': '92cfceb39d57d914ed8b14d0e37643de0797ae56',
    'Foo.Mp3': '95797b6eb253337ff2c54e0881e2b747ec394f51',
    'SomePage': 'd7e80bae461ca8568e794792f5520b603f540e06',
    'Teh bar.jpg': 'ed9102c4aa099e92baf1073f824d21c5e4be5944',
    'Teh foo.txt': 'ab97ba98d98fcf72b92e33a66b07077010171f70',
    'bar.7z': '6c9600ad4d59ac864e6f0d2030c1fc76b4b406cb',
    'bar.jpg': 'ae0faa593abf2b6f8871f6f32fe5b28d1c6572be',
    'foo.$$$': 'eefc6aa745dbe129e8067a4a57637883edd83a8a',
    'foo.2.txt': 'a8fcfcc2ef4e400ee09ae53c1aabd7f5a5fda0c7',
    'foo.txt': '9206ac42b532ef8e983470c251f4e1a365fd636c',
    u'bar.aäc': '70d0e3b813fdc756602d82748719a3ceb85cbf29',
    u'ÜberSicht': 'a16c6837f6d3d2cc3addd68976db1c55deb694c8',
}


class TicketOnlyViewsTicket(Component):
    implements(IPermissionPolicy)

    def check_permission(self, action, username, resource, perm):
        if action.startswith('TICKET_'):
            return resource.realm == 'ticket'
        else:
            return None


class AttachmentTestCase(unittest.TestCase):

    def setUp(self):
        self.env = EnvironmentStub()
        self.env.path = tempfile.mkdtemp(prefix='trac-tempenv-')
        self.attachments_dir = os.path.join(self.env.path, 'files',
                                            'attachments')
        self.env.config.set('trac', 'permission_policies',
                            'TicketOnlyViewsTicket, LegacyAttachmentPolicy')
        self.env.config.set('attachment', 'max_size', 512)

        self.perm = PermissionCache(self.env)
        with self.env.db_transaction as db:
            db("INSERT INTO wiki (name,version) VALUES ('WikiStart',1)")
            db("INSERT INTO wiki (name,version) VALUES ('SomePage',1)")
            db("INSERT INTO ticket (id) VALUES (42)")

    def tearDown(self):
        self.env.reset_db_and_disk()

    def test_get_path(self):
        attachment = Attachment(self.env, 'ticket', 42)
        attachment.filename = 'foo.txt'
        self.assertEqual(os.path.join(self.attachments_dir, 'ticket',
                                      hashes['42'][0:3], hashes['42'],
                                      hashes['foo.txt'] + '.txt'),
                         attachment.path)
        attachment = Attachment(self.env, 'wiki', 'SomePage')
        attachment.filename = 'bar.jpg'
        self.assertEqual(os.path.join(self.attachments_dir, 'wiki',
                                      hashes['SomePage'][0:3],
                                      hashes['SomePage'],
                                      hashes['bar.jpg'] + '.jpg'),
                         attachment.path)

    def test_path_extension(self):
        attachment = Attachment(self.env, 'ticket', 42)
        attachment.filename = 'Foo.Mp3'
        self.assertEqual(os.path.join(self.attachments_dir, 'ticket',
                                      hashes['42'][0:3], hashes['42'],
                                      hashes['Foo.Mp3'] + '.Mp3'),
                         attachment.path)
        attachment = Attachment(self.env, 'wiki', 'SomePage')
        attachment.filename = 'bar.7z'
        self.assertEqual(os.path.join(self.attachments_dir, 'wiki',
                                      hashes['SomePage'][0:3],
                                      hashes['SomePage'],
                                      hashes['bar.7z'] + '.7z'),
                         attachment.path)
        attachment = Attachment(self.env, 'ticket', 42)
        attachment.filename = 'foo.$$$'
        self.assertEqual(os.path.join(self.attachments_dir, 'ticket',
                                      hashes['42'][0:3], hashes['42'],
                                      hashes['foo.$$$']),
                         attachment.path)
        attachment = Attachment(self.env, 'wiki', 'SomePage')
        attachment.filename = u'bar.aäc'
        self.assertEqual(os.path.join(self.attachments_dir, 'wiki',
                                      hashes['SomePage'][0:3],
                                      hashes['SomePage'],
                                      hashes[u'bar.aäc']),
                         attachment.path)

    def test_get_path_encoded(self):
        attachment = Attachment(self.env, 'ticket', 42)
        attachment.filename = 'Teh foo.txt'
        self.assertEqual(os.path.join(self.attachments_dir, 'ticket',
                                      hashes['42'][0:3], hashes['42'],
                                      hashes['Teh foo.txt'] + '.txt'),
                         attachment.path)
        attachment = Attachment(self.env, 'wiki', u'ÜberSicht')
        attachment.filename = 'Teh bar.jpg'
        self.assertEqual(os.path.join(self.attachments_dir, 'wiki',
                                      hashes[u'ÜberSicht'][0:3],
                                      hashes[u'ÜberSicht'],
                                      hashes['Teh bar.jpg'] + '.jpg'),
                         attachment.path)

    def test_select_empty(self):
        self.assertRaises(StopIteration,
                          Attachment.select(self.env, 'ticket', 42).next)
        self.assertRaises(StopIteration,
                          Attachment.select(self.env, 'wiki', 'SomePage').next)

    def test_insert(self):
        attachment = Attachment(self.env, 'ticket', 42)
        attachment.insert('foo.txt', StringIO(''), 0, 1)
        attachment = Attachment(self.env, 'ticket', 42)
        attachment.insert('bar.jpg', StringIO(''), 0, 2)

        attachments = Attachment.select(self.env, 'ticket', 42)
        self.assertEqual('foo.txt', attachments.next().filename)
        self.assertEqual('bar.jpg', attachments.next().filename)
        self.assertRaises(StopIteration, attachments.next)

    def test_insert_unique(self):
        attachment = Attachment(self.env, 'ticket', 42)
        attachment.insert('foo.txt', StringIO(''), 0)
        self.assertEqual('foo.txt', attachment.filename)
        attachment = Attachment(self.env, 'ticket', 42)
        attachment.insert('foo.txt', StringIO(''), 0)
        self.assertEqual('foo.2.txt', attachment.filename)
        self.assertEqual(os.path.join(self.attachments_dir, 'ticket',
                                      hashes['42'][0:3], hashes['42'],
                                      hashes['foo.2.txt'] + '.txt'),
                         attachment.path)
        self.assertTrue(os.path.exists(attachment.path))

    def test_insert_outside_attachments_dir(self):
        attachment = Attachment(self.env, '../../../../../sth/private', 42)
        self.assertRaises(TracError, attachment.insert, 'foo.txt',
                          StringIO(''), 0)

    def test_delete(self):
        attachment1 = Attachment(self.env, 'wiki', 'SomePage')
        attachment1.insert('foo.txt', StringIO(''), 0)
        attachment2 = Attachment(self.env, 'wiki', 'SomePage')
        attachment2.insert('bar.jpg', StringIO(''), 0)

        attachments = Attachment.select(self.env, 'wiki', 'SomePage')
        self.assertEqual(2, len(list(attachments)))

        attachment1.delete()
        attachment2.delete()

        self.assertFalse(os.path.exists(attachment1.path))
        self.assertFalse(os.path.exists(attachment2.path))

        attachments = Attachment.select(self.env, 'wiki', 'SomePage')
        self.assertEqual(0, len(list(attachments)))

    def test_delete_file_gone(self):
        """
        Verify that deleting an attachment works even if the referenced file
        doesn't exist for some reason.
        """
        attachment = Attachment(self.env, 'wiki', 'SomePage')
        attachment.insert('foo.txt', StringIO(''), 0)
        os.unlink(attachment.path)

        attachment.delete()

    def test_reparent(self):
        attachment1 = Attachment(self.env, 'wiki', 'SomePage')
        attachment1.insert('foo.txt', StringIO(''), 0)
        path1 = attachment1.path
        attachment2 = Attachment(self.env, 'wiki', 'SomePage')
        attachment2.insert('bar.jpg', StringIO(''), 0)

        attachments = Attachment.select(self.env, 'wiki', 'SomePage')
        self.assertEqual(2, len(list(attachments)))
        attachments = Attachment.select(self.env, 'ticket', 123)
        self.assertEqual(0, len(list(attachments)))
        self.assertTrue(os.path.exists(path1) and os.path.exists(attachment2.path))

        attachment1.reparent('ticket', 123)
        self.assertEqual('ticket', attachment1.parent_realm)
        self.assertEqual('ticket', attachment1.resource.parent.realm)
        self.assertEqual('123', attachment1.parent_id)
        self.assertEqual('123', attachment1.resource.parent.id)

        attachments = Attachment.select(self.env, 'wiki', 'SomePage')
        self.assertEqual(1, len(list(attachments)))
        attachments = Attachment.select(self.env, 'ticket', 123)
        self.assertEqual(1, len(list(attachments)))
        self.assertFalse(os.path.exists(path1) and os.path.exists(attachment1.path))
        self.assertTrue(os.path.exists(attachment2.path))

    def test_legacy_permission_on_parent(self):
        """Ensure that legacy action tests are done on parent.  As
        `ATTACHMENT_VIEW` maps to `TICKET_VIEW`, the `TICKET_VIEW` is tested
        against the ticket's resource."""
        attachment = Attachment(self.env, 'ticket', 42)
        self.assertTrue('ATTACHMENT_VIEW' in self.perm(attachment.resource))

    def test_resource_exists(self):
        att = Attachment(self.env, 'wiki', 'WikiStart')
        att.insert('file.txt', StringIO(''), 1)
        self.assertTrue(resource_exists(self.env, att.resource))


class AttachmentModuleTestCase(unittest.TestCase):

    def setUp(self):
        self.env = EnvironmentStub()
        self.env.path = tempfile.mkdtemp(prefix='trac-tempenv-')

    def tearDown(self):
        self.env.reset_db_and_disk()

    class GenericResourceManager(Component):

        implements(IResourceManager)

        def get_resource_realms(self):
            yield 'parent_realm'

        def get_resource_url(self, resource, href, **kwargs):
            pass

        def get_resource_description(self, resource, format='default',
                                     context=None, **kwargs):
            pass

        def resource_exists(self, resource):
            return resource.id == 'parent_id'

    def test_invalid_post_request_raises_exception(self):

        path_info = '/attachment/parent_realm/parent_id/attachment_id'
        attachment = Attachment(self.env, 'parent_realm', 'parent_id')
        attachment.insert('attachment_id', StringIO(''), 0, 1)
        req = MockRequest(self.env, method='POST', action=None,
                          path_info=path_info)
        module = AttachmentModule(self.env)

        self.assertTrue(module.match_request(req))
        self.assertRaises(HTTPBadRequest, module.process_request, req)

    def test_post_request_without_attachment_raises_exception(self):
        """TracError is raised when a POST request is submitted
        without an attachment.
        """
        path_info = '/attachment/parent_realm/parent_id'
        req = MockRequest(self.env, path_info=path_info, method='POST',
                          args={'action': 'new'})
        module = AttachmentModule(self.env)

        self.assertTrue(module.match_request(req))
        self.assertRaises(TracError, module.process_request, req)

    def test_attachment_parent_realm_raises_exception(self):
        """TracError is raised when 'attachment' is the resource parent
        realm.
        """
        path_info = '/attachment/attachment/parent_id/attachment_id'
        req = MockRequest(self.env, path_info=path_info)
        module = AttachmentModule(self.env)

        self.assertTrue(module.match_request(req))
        self.assertRaises(TracError, module.process_request, req)

    def test_resource_doesnt_exist(self):
        """Non-existent resource returns False from resource_exists."""
        r = Resource('wiki', 'WikiStart').child('attachment', 'file.txt')
        self.assertFalse(AttachmentModule(self.env).resource_exists(r))


def suite():
    suite = unittest.TestSuite()
    suite.addTest(unittest.makeSuite(AttachmentTestCase))
    suite.addTest(unittest.makeSuite(AttachmentModuleTestCase))
    return suite

if __name__ == '__main__':
    unittest.main(defaultTest='suite')
