c611ace9a2
Update German localization
6 years ago
6d0b30d456
Fix bug where messages list was not updated after moving ALL messages ( #6310 )
6 years ago
3d0b2cd3ce
Pass PEAR errors to rcube::raise_error(), small CS improvements
6 years ago
12b1b54792
Fix bug where after "mark all folders as read" action message counters were not reset ( #6307 )
...
also fixed one PHP 7.2 warning
6 years ago
2275df3bca
Fix js error when flagging a message as unread
6 years ago
9e289982ac
Add "Disk usage: " prefix to the quota element title
6 years ago
6691756ea1
Fix bug where unicode contact names could have been broken/emptied or caused DB errors ( #6299 )
6 years ago
30ab2eec5f
Remove function_exists() checks for mbstring functions
6 years ago
01f331e303
Merge branch 'master' of github.com:roundcube/roundcubemail
6 years ago
3ede8e5404
Show message flagged status in message view ( #5080 )
...
for Larry and Elastic
6 years ago
9e129c93d7
Fix blankpage compat. with assets_path setting
6 years ago
199761ad12
Fix blankpage compat. with assets_path setting
6 years ago
13ad9e6593
Merge branch 'master' into dev/elastic
6 years ago
9d3d600a25
Display a dialog for mail import with supported format description and upload size hint
6 years ago
4b97f40af9
Get rid of debug_level ( #6298 )
6 years ago
5843d8cdcd
Elastic: Small improvements in message headers layout
6 years ago
b08a5e7873
Display a hint about max file size for contacts import
6 years ago
750827ad65
Merge branch 'master' into dev/elastic
6 years ago
71eec07d25
Fix regression where some non-inline attachments could be not listed ( #6291 )
6 years ago
647a7e91c6
Unify content frame (watermark) template objects ( #6285 )
...
* unify content frame (watermark) template objects
* several improvements, use existing env var for watermark url
* tighten up var parsing for contentframe template object
6 years ago
b6a10acfbe
Elastic: Fix popup initialization on cloned buttons
6 years ago
9746de23e8
Elastic: Small improvements in searchbar
6 years ago
0d62450efc
Add easy way to change skin via GET param, for developers only
6 years ago
211c5444e5
Merge branch 'master' into dev/elastic
6 years ago
34a280ef89
Fix regression where Edit identities link wasn't working
...
Extend switch-task command to accept argument in form of task/action.
6 years ago
da5080a980
Merge branch 'master' into dev/elastic
...
Conflicts:
skins/elastic/ui.js
6 years ago
b1ea91c161
Fix typo in English translations. ( #6287 )
6 years ago
fc88c5b1f6
Elastic: Use select.custom-select instead of select.form-control
...
It's just better looking.
6 years ago
430c000e32
Support skin localization ( #5853 )
6 years ago
66550f65ae
Support enabling checkbox selection on list after intialization and existing records
6 years ago
67b5ba67dd
Show confirm dialog when moving folders using drag and drop ( #6119 )
...
As it was very easy to accidentally move a folder tree by dragging & dropping
we now ask the user to confirm the action.
6 years ago
526f4ddbb4
Elastic: Fix interface "jump" after folder rename ( #6283 )
6 years ago
f0fc42b3c4
Elastic: Try a new design for some toolbars (work in progress)
6 years ago
1247a8dd7d
Fix bug where some forbidden characters on Cyrus-IMAP were not prevented from use in folder names
6 years ago
0716d499bc
Fix bug where some escape sequences in html styles could bypass security checks
6 years ago
c236c22c41
Parse all quotas from GETQUOTAROOT ( #6280 )
6 years ago
5caab079fa
Make settings list html more consistent ( #6204 )
6 years ago
8eebbbfba4
Use timer to differentiate touch or touch + hold events ( #6259 )
6 years ago
89715b040b
Pass an element index to the list_callback in entity_selector()
6 years ago
35a3abd3de
Fix skin extending for assets ( #5115 ) - take two
6 years ago
8355ba62fb
Revert "Fix skin extending for assets ( #5115 )"
6 years ago
c0b9025215
Remove sample PHP configuration from .htaccess and .user.ini files ( #5850 )
...
Moved to https://github.com/roundcube/roundcubemail/wiki/Installation#php-configuration
6 years ago
63d3ad11fb
Use Masterminds/HTML5 parser for HTML5 support ( #5761 )
6 years ago
2f7aaca342
Allow plugins to prevent multiple execution of getselection JS event ( #6256 )
6 years ago
3e241d728c
Remove IE7 hack
6 years ago
acfd335f14
Simplify code to set/change a skin
...
When changing skin in Preferences we do not use the new skin immediately,
we do this after redirect.
6 years ago
3e0e12227e
Use default skin on login page, also after logout
...
Before we stored user skin in session to keep user skin on logon after logout.
After more thinking... imho it's better to always present the same logon look.
6 years ago
e79838aaac
Enigma: Disable autofill for new keypair password
6 years ago
3f53acb64a
Fix regression in skin extending for assets (commit ecde98729b)
...
It could have been possible that core template loaded plugin files
by mistake (if file with the same name existed), we don't want that.
6 years ago
c1774b6e1d
Put additional footer content before "footer scripts" (for Elastic)
6 years ago
ecde98729b
Fix skin extending for assets ( #5115 )
...
Remove redundant is_file() calls.
6 years ago
dd3ea4ed2b
Fix extracting codepage
6 years ago
8a6a9e86ae
Fix handling of forwarded messages inside of a TNEF message ( #5632 )
6 years ago
a889f55c31
Fix PHP Warning: Use of undefined constant IDNA_DEFAULT on systems without php-intl ( #6244 )
6 years ago
3f985c35d1
Elastic: Small form fixes
6 years ago
418c72137e
Improve search_form() for external use
6 years ago
b2bebe531a
Fix bug where usernames without domain part could be malformed or converted to lower-case on logon ( #6224 )
6 years ago
8e543f843e
Fix check_request() bypass in places using get_uids() [CVE-2018-9846] ( #6238 )
6 years ago
431f89f9b7
Fix "Mark all as read" dialog ( #6235 )
6 years ago
8df6d7c3e4
Fix regression in compressMessageSet() ( #6235 )
6 years ago
5832eca405
RCMAIL_CHARSET -> RCUBE_CHARSET ( #6236 )
6 years ago
8b0540d402
Fix possible IMAP command injection and type juggling vulnerabilities ( #6229 )
6 years ago
df3878501c
Fix PHP 7.2: count(): Parameter must be an array in enchant-based spellchecker ( #6234 )
6 years ago
73ea8f94d0
Use htmlspecialchars() with charset argument, simplify some code
6 years ago
f36e23b778
Fix parsing date strings (e.g. from a Date: mail header) with comments ( #6216 )
6 years ago
2428be488e
Allow style tags in HTML editor on composed/reply messages ( #5751 )
6 years ago
c973f003e5
Synchronized localizations with Transifex
6 years ago
2196f50437
Support redis_debug in the redis session driver
6 years ago
0f3ad342f7
Fix bug where some unix timestamps were not handled correctly by rcube_utils::anytodatetime() ( #6212 )
6 years ago
a451ad6599
Fix handling encoding of HTML tags in "inline" JSON output ( #6207 )
6 years ago
981cd8726d
Remove holes in cache index keys - makes the serialized representation shorter
6 years ago
866bf959b7
Use document.body consistently
6 years ago
eb91daf00d
Added 9pt and 11pt to the list of font sizes in HTML editor
6 years ago
1058924e21
Move some framework classes to sub-directories
6 years ago
d07b032bcd
Refactor cache code with separate engine-specific classes
6 years ago
fa06d37901
Merge branch 'feature/add_redis_as_cache' of https://github.com/ledgr/roundcubemail into ledgr-feature/add_redis_as_cache
6 years ago
31ffef67ad
Skip _lang param if not set ( #6203 )
6 years ago
6bfebc5e32
Add sanity check when auto-unsubscribing non-existing folders
6 years ago
51cf1c5935
Fix setting contacts copy action state, CS fixes
6 years ago
b01e5ae192
Trigger getselection in get_single_selection() ( #6180 )
...
Make it so that the event getselection is triggered when either rcube_list_widget::get_selection() or rcube_list_widget::get_single_selection() is called
6 years ago
1556eb01c7
Use JSON_UNESCAPED_UNICODE only on PHP >= 7.1.0 ( #6187 )
6 years ago
3fe16de335
Code de-duplication
6 years ago
5f5f5f98e9
Merge branch 'movecopy' of https://github.com/johndoh/roundcubemail into johndoh-movecopy
6 years ago
672e57ea48
Patched bug where rcube_db::quote() was causing an infinite connection loop. ( #6175 )
...
As rcube_db::quote() checks to see if the connection is up before quoting, this would cause the class to try connect again, as rcube_db::$dbh was not being set until AFTER conn_configure was completed, causing a loop.
So updated rcube_db::$dbh in the rcube::conn_create() function instead allowing access to the new object straight away.
It's needed for edeb5d7
6 years ago
8c734977de
simplify execution of grop_delete
6 years ago
c9555506b3
Fix using display_message() with a localization label from inside an iframe
...
We have to localize the label before we redirect execution to parent window.
6 years ago
a1be62b19d
Remove redundant trim()
6 years ago
9d2b303b51
Fix bug in remote content blocking on HTML image and style tags ( #6178 )
6 years ago
b46cd5de1d
Fix PHP Warning: exif_read_data(...): Illegal IFD size ( #6169 )
6 years ago
e371469664
Add Redis as cache backend
7 years ago
dba7134201
small fix after last commit
7 years ago
15cf12db1d
Fallback to default compose action if addressbook is selected but has no members
7 years ago
9066ed4fa3
Add two labels, use consistent spacing
7 years ago
f3c7b979b0
Remove redundant code
...
A first input in a dialog is focused automatically, no need to add code for this
7 years ago
4f1da97af2
Merge branch 'master' into movecopy
7 years ago
dfc835eb38
Fix add-contact and contact-delete actions
7 years ago
edeb5d7ab4
Add support for PostgreSQL schemas in DSN ( #6150 )
...
If schema is set in the dsn, set search_path to the schema value.
Example:
$config['db_dsnw'] = 'pgsql://user:pass@localhost/dbname?schema=exampleschema';
7 years ago
59a63c95a4
Add possibility to scale/rotate image attachments for preview ( #6111 )
7 years ago
95298fa428
Add option to encrypt & sign with Mailvelope > 2.0
...
UI elements added to larry and classic skin
7 years ago
43dcb3bdd9
simplify execution of group_assign_selected JS
7 years ago
f15c2eb777
simplify execution of move+copy JS commands
7 years ago
a8b16031bd
add originalEvent param to actionafter event ( #6144 )
7 years ago
76933f1c07
Elastic: Bootstrap 4.0.0 compat.
7 years ago
3dcbc616a4
s/unicode/Unicode/
7 years ago
4f6079833a
Fix PHP 7.2 warning: count(): Parameter must be an array or an object that implements Countable
7 years ago
e457cff08b
Add space between buttons + trigger update event for skins
7 years ago
b9a68b516a
Make editity encryption view appear correctly in classic skin
7 years ago
1cb97c7efd
Add 'encryption' block to identity settings
...
If Mailvelope is installed, this box will become visible and offer
functions to generate a key pair for the selected identity or list
existing private keys.
7 years ago
1332d2e793
Add some localization messages for Elastic
7 years ago
b00d5c3836
Automatically localize data-label-* attributes of a template object
7 years ago
39a6c69a3d
Automatically localize the first argument of display_message()
7 years ago
f2b64779cc
Display confirmation message when inserting a response or signature
7 years ago
7a719d203d
Fix addressbook selector, show copy menu-item also when there's one readonly and one writeable addressbook
7 years ago
eb0228ba86
Merge branch 'move_addressbook' of https://github.com/johndoh/roundcubemail into johndoh-move_addressbook
7 years ago
ec25fa857b
Improve layout of contact import form
...
Move the file input to the .propform table.
7 years ago
4793ec753a
Remove double-quotes in filename* parameter of the Content-Disposition of downloads ( #5857 )
7 years ago
4548646410
small correction to label
7 years ago
55e99398e1
Fix possible information leak - add more strict sql error check on user creation ( #6125 )
7 years ago
04d371b88f
fix plugin compatibility in addressbook toolbar
7 years ago
a17c123903
Fix drop action (using jquery-ui draggable) on rcube_list_widget
7 years ago
d5071fedba
vcard_attachments: add link to contact actions menu
...
*) add 'forward vcard' link to contact actions manu
*) fix bug when a contact with a secondary email address is selected
*) improve support for multiple address books in contact list widget on compose screen
7 years ago
abbb832c6f
move qrcode link to new contact actions menu
7 years ago
489da28dab
add move/copy contact widget
7 years ago
ce338164e3
Fix bug where contacts search could skip some records ( #6130 )
7 years ago
83bd85677b
Remove x_frame_options env
7 years ago
8de9fa707b
Fix X-Frame-Options:ALLOW-FROM support, remove custom click-jacking protection ( #6057 )
7 years ago
59bbf6c081
Fix preg_match in guess_type function ( #6123 )
7 years ago
e4c7e8ac7c
Fix bug where attachment size wasn't visible when the filename was too long ( #6033 )
...
Uses flexbox, so works in recent browsers only. I don't plan to support olders.
7 years ago
af9550251e
Display an error when clicking disabled link to register protocol handler ( #6079 )
7 years ago
c2199c5101
Cleanup folder subscriptions "form"
7 years ago
0d8afd2b01
Fallback to document element if an event (maybe custom) has no target nor srcElement specified
7 years ago
946599acda
Close page selector when leaving the input with keyboard
7 years ago
230fc1203d
Disable tabIndex on selection checkboxes
7 years ago
b172fb505c
Improve trusted_host_patterns code
7 years ago
4a5ca74724
Merge branch 'trusted-host-patterns' of https://github.com/dsoares/roundcubemail into dsoares-trusted-host-patterns
7 years ago
a8d5547163
Update idn convertion methods ( #6115 )
...
* Add more test cases
* Update phpdoc
7 years ago
63a7d2313f
Improve SMTPUTF8 support and fix relaxed email validation issues
7 years ago
5665344673
Merge branch 'smtputf8' of https://github.com/jprjr/roundcubemail into jprjr-smtputf8
7 years ago
8b0109d81c
Add set_content() method to the editor widget
7 years ago
90b0cd814a
Add editor-load event and enable shift-click on links in HTML editor
7 years ago
52864ef885
Add some localization messages, remove one unused message
7 years ago
fbc4486881
Fix so Shift selection also works on list selection checkboxes
7 years ago
307d682ad2
Code simplification
7 years ago
5f26d9bf34
Prevent "calling draggable before initailization" errors
...
Elastic skin disables dragging on folders list, so we have to check
if it's still draggable before we call draggable() again. Otherwise
it will throw an error.
7 years ago
a2875cdda9
- Fix searching contacts by address in LDAP source ( #6084 )
7 years ago
dcbb4ec125
Add localization message for Elastic
7 years ago
55a1d6ef1b
Make search form's aria label to also support plugin localization (via label-domain property)
7 years ago
3e0edd98c9
Update changelog
7 years ago
ac13669de5
Fix PHP 7.2: count(): Parameter must be an array or an object that implements Countable ( #6098 )
7 years ago
77cc9688c8
Fix bug where contacts export by selection returned no more than 10 entries ( #6103 )
7 years ago
38d275445d
Plugin API: Add 'write' argument to 'render_page' hook
7 years ago
604f84e1fb
Execute clickjacking prevention code only when framed
7 years ago
c0959bd619
Sanity checks for header data length in FETCH ( #6087 )
...
Where we know what expected data length is we truncate the input.
7 years ago
3cdc8af297
Fix possible performance issue when parsing malformed and long Date header ( #6087 )
7 years ago
05d1b1947e
Check for minified CSS files ( #6089 )
7 years ago
0a3dbbb76f
Add 'list' argument to listupdate event, trigger listupdate also on contacts list in mail compose
7 years ago
6ccc8cc020
The "it is a draft" message is more an information than a warning
7 years ago
5dbe1f2a5e
A device can't be a tablet and a mobile ( #6086 )
7 years ago
4a5941c24b
Fix get_next() for case when the node is last in the tree branch
7 years ago
5d26de4467
Add 'datepicker' class also to dinamically generated date inputs
7 years ago
de544cc905
Add possibility to use localized date format as datepicker input placeholder
...
Need to be supported by skin. Elastic support is comming.
7 years ago
8e2f6275a4
Prevent from empty 'class' attribute in generated html
7 years ago
00cb440a07
Inline warnings can contain HTML code (regression fix)
7 years ago
db382fa19c
Change remote images to remote resources warning also in html attachment preview
7 years ago
3488531b26
Fix PHP Warning: Use of undefined constant INTL_IDNA_VARIANT_UTS46 on servers without php-intl extension
7 years ago
46e2e7e16c
CS fix
7 years ago
09c8b33439
Code deduplication
7 years ago
161038ee87
Support additional connect parameters in PostgreSQL database wrapper ( #6071 )
...
Most notably this change enables you to specify whether or with what
priority a secure SSL TCP/IP connection will be negotiated with the
database server.
7 years ago
78aa0efa15
Use confirmation (not notice) message for some successful actions
7 years ago
842d57e779
Fix setting height of a dialog without buttons pane
7 years ago
61a6666eee
Small CS fixes
7 years ago
d76f255c3b
Improve iPad/iPhone detection
...
Some devices do not set iPhone/Ipad string in User-Agent, so we
have to check also navigator.platform.
7 years ago
92d6673bb5
Add 'signature' identifier to signature element in sent HTML message ( #6073 )
7 years ago
ca39a4e093
Fix PHP warning "idn_to_utf8(): INTL_IDNA_VARIANT_2003 is deprecated" with PHP 7.2 ( #6075 )
7 years ago
489ad88617
Small code de-duplication
7 years ago
758044d69e
Add skin config options to dont_override list
...
... so e.g. options in user preferences will be hidden.
7 years ago
5a63e52380
Add class attribute to the pushgroup action button
7 years ago
52b252ea26
Also stop propagation on keyup event in dialogs
7 years ago
c5db84262e
Don't propagate keyboard events to the UI below the dialog ( #6055 )
7 years ago
6dbdf9dedd
Skip empty blocks in contact form
7 years ago
196ce5d251
Fix so clicking pushgroup link on contacts list does not load group information page
...
Added a general way to mark all such links with data-action-link attribute.
7 years ago
36638ec0c2
Fix untagged COPYUID responses handling - again ( #5982 )
7 years ago
9ce8948294
Get rid of the 2nd argument of include_stylesheet()
...
.. make the optional behavior default now.
7 years ago
1cf72fa2b6
Allow plugins to include Less files ( #6051 )
7 years ago
3ed6418d55
Use attributes of the template object
7 years ago
c6b2d8bead
Merge branch 'dev-elastic'
7 years ago
c6e6f50de1
Simplify confirm_dialog and alert_dialog code and use
7 years ago
43c210f04d
Merge branch 'pretty_confirms' of https://github.com/JohnDoh/roundcubemail into JohnDoh-pretty_confirms
7 years ago
8c250a27f8
improvements for plugins and frames
7 years ago
01e3cf23e0
Fix PHP Warning: Use of undefined constant 'href'
7 years ago
e7311e0e5e
more consistent function names
7 years ago
af52df68bf
use skinned alert and confirm boxes in plugins
7 years ago
4cb7713520
Fix checking table columns when there's more schemas/databases in postgres/mysql ( #6047 )
7 years ago
a6c37b7735
Fix broken long filenames when using imap4d server - workaround server bug ( #6048 )
7 years ago
f6733a5d9e
Add id attribute to the reply-intro para ( #6049 )
7 years ago
eed4be3ba6
Display value of the SMTP message size limit in the error message ( #6032 )
7 years ago
26f1b0770c
use skinned alert boxes
7 years ago
b897fe9349
use skined confirmation boxes where possible
7 years ago
e6398f8786
Assign attachment type classes also in print mode
7 years ago
828f73a4b9
Small improvements to .image-attachment contents strusture
7 years ago
96d3553c79
Add some labels for Elastic
7 years ago
adc9df803b
Fix var scope ( #6042 )
7 years ago
552a851d6c
Append "..." to draglayer as div, the same as other drag entries
7 years ago
8fcd014040
Small improvement to .cancelupload button
7 years ago
0385eca50e
Add tmplate option to place contact source inside the contact head element
7 years ago
ff1b994ece
More precise dialog height calculation - that works with various skins
7 years ago
4dc1f3b757
Use configured log_file_ext also for errors thrown by PHP ( #6035 )
7 years ago
910c735b87
Merge branch 'master' into dev-elastic
7 years ago
d7be2f1946
Merge branch 'dev-elastic' of github.com:roundcube/roundcubemail into dev-elastic
7 years ago
a0374f3c45
Fix mangled non-ASCII characters in links in HTML messages ( #6028 )
7 years ago
2a32f51c91
Fix file disclosure vulnerability caused by insuficient input validation in relation with attachment plugins ( #6026 )
7 years ago
7a7ef7b687
Don't treat .eml attachments to drafts as drafts
7 years ago
35a59b97a1
Add some labels for Elastic
7 years ago
23af0b7f36
Merge branch 'master' into dev-elastic
7 years ago
1b87ec3144
Don't stop propagation in folder-selector click handler
7 years ago
5282cbaff9
Check against trusted_host_patterns in rcube_utils::parse_host()
7 years ago
662cbfb805
Fix add_url() so it works properly with fragment identifier (#element) at the end of the original url
7 years ago
0f4f85e097
Skip redundant INSERT query on successful logon when using PHP7
...
Since PHP 7.0 session_regenerate_id() will cause the old session data update.
This is redundant INSERT query and also produces a record for the session
we don't need anymore.
7 years ago
80ea6ec3eb
Small improvements in error page content
7 years ago
29b8f600c4
Hide "loading" message also when iframe loading fails with the error page
7 years ago
ce594a4405
Support simple dialog's save button to be a label with domain
7 years ago
1f9ac5c18f
Style Archive folder (icon) also in folder selector
7 years ago
a61f2fdd3c
Fix decoding of mailto: links with + character in HTML messages ( #6020 )
7 years ago
342b049841
Update localization files from Transifex
7 years ago
6be122352d
Support short-legend-labels in contact search form
7 years ago
7195204865
Use input-group for default_font and default_font_size
7 years ago
b1d79900ed
Fix invalid/partial merge of 3196d656db
7 years ago
ef0982f1b8
Merge branch 'master' into dev-elastic
7 years ago
7a95b148f8
Add option to use "Personal" instead of "Personal Information" label in contact form
...
We want short labels so tabs aren't wrapped on mobile
7 years ago
a346eb9717
Add localization label for "Personal"
7 years ago
a8aa559fa1
Use action=add-folder when creating a new folder
7 years ago
25a7df7f4b
Use action=add-folder when creating a new folder
7 years ago
5031028d48
Elastic: Support more compact contact frame (info and form)
...
... plus some CS fixes
7 years ago
fe542437a8
Add field labels in Advanced search form, CS fixes
7 years ago
72a410503a
Use simple list instead of table for groups list in contact info
7 years ago
50a9c8f777
Add option trusted_host_patterns
7 years ago
515d496808
Replace display_version with display_product_info ( #5904 )
7 years ago
a8f0d35ebc
Extend disabled_actions config so it accepts also button names ( #5903 )
7 years ago
e21ab984bc
Skip <span> wrappers in html_table that is a <ul> list
7 years ago
d815525c6a
Merge branch 'master' into dev-elastic
7 years ago
5e671885e4
Prevent from ghost messages on list after fast delete of multiple messages one-by-one ( #5941 )
7 years ago
459cc7ab6d
Fix bug where removing the last subfolder did not hide toggle button on its parent record ( #6007 )
7 years ago
ce0592e1fc
Fix truncated folder name on messages list in multi-folder mode, for folders with non-ascii characters ( #6004 )
7 years ago
4574870adc
fix: unknown content-disposition type should be treated as attachment ( #6002 )
7 years ago
da15d55665
Fix regression in qsearch() that skipped execution when called with no args
...
Some plugins would like to do search without value,
so we keep value != '' check to allow that use-case.
7 years ago
1c4e5a585f
Support displaying all message headers in a dialog, use GET instead of POST
7 years ago
9d1c8aff83
Elastic skin support for managesieve (part II)
7 years ago
5e08a6ac59
Handle remote stylesheets the same as remote images, ask the user to allow them ( #5994 )
...
Fixes the issue where remote stylesheet could have been blocked
if the message contained no remote images and user have no way to
allow that content.
7 years ago
72aedd368b
Fix Edge encoding bug when pasting text into the HTML editor, update to TinyMCE 4.5.8 ( #5885 )
7 years ago
3196d656db
Fix css conflicts in user interface and e-mail content ( #5891 )
...
... by adding prefix to element/class identifiers
Also cleaned up some code and removed global variable use.
7 years ago
Aleksander Machniak