- add page existence check to prevent attempts to render metadata for non-existent pages (FS#1254)
- add key & subkey existence checks to avoid PHP warnings

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bool page_exists($id, $rev

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Wrapper around DokuWiki's mail_send() function.
For full details refer http://wiki.splitbrain.org/wiki:events_list#mail_message_send

Also see discussion at http://www.freelists.org/archives/dokuwiki/09-2007/msg00077.html

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The use of realpath() to clean up relative file names caused some
trouble in certain setups relying on symlinks or having restricitve
file structure setups.

This patch replaces all realpath() calls with a PHP only replacement
which should solve those problems.

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Media metadata update changes file permissions to default.
Should call chmod if needed.

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Creates another index file 'pagewords.idx' for the words in each page.
Words that are deleted from a page can then be removed from the word index.
The indexer version is incremented to force rebuilding of the index.
Also, a minor flaw in the regexp for asian words is fixed.

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    This adds a new event MEDIA_UPLOAD_FINISH which is triggered
    when a media file is uploaded via the mediamanager.
    (The event is preventable)

    Event data:
        data[0] temporary file name (read from $_FILES)
        data[1] file name of the file being uploaded
        data[2] future directory id of the file being uploaded
        data[3] the mime type of the file being uploaded

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If a Server supplies a Content-Length header we stop reading when the specified
number of bytes was read. This fixes problems with Servers not closing the
connection after sending the body.

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This patch adds a security token to all forms generated through the new
form class. However it is only checked for possible dangerous actions like
editing or profile changes.

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This patch adds a session based token to all form in the default action plugins.
The validity of the token is checked before any administrative function is
executed aiming to protect DokuWiki's admin functions from Cross-site request
forgery (CSRF) attacks.

Another patch will follow to add the same functionality on other, less critical
functions.

More details on CSRF attacks can be found at
http://en.wikipedia.org/wiki/Cross-site_request_forgery

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This is my patch for creating toolbar buttons with arbitrary button types,
tested with Firefox, Opera and IE7. If you want to create a new type of
button, you must have a function in the script.js file of your plugin. The
function name must begin with "addBtnAction", followed by the type name, for
example for the type "myType" the function must be called
"addBtnActionMyType" (bear in mind that the first char of the type must be
uppercased in the function name).

The function has four parameters:
"btn" is the HTML element for the button where you attach the onclick
handler
"props" is an associative array of the array properties that come from the
toolbar array that was created by toolbar.php
"edid" (optional) is the id of the editor textarea
"id" (optional) is a "unique" number for each button: the index variable of
the for loop where the buttons get created.

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Calls to p_get_first_heading() are most likely to expect to get the first heading even if it needs to be
generated, that is a $render value of true.  Only the metadata renderer itself needs a value of false in
order to prevent mutual dependency probelms.

This fix should finally complete FS#1010 & problems breadcrumbs have with use_first_headings when metadata
doesn't exist.  Also see, http://www.freelists.org/archives/dokuwiki/08-2007/msg00018.html &
http://www.freelists.org/archives/dokuwiki/08-2007/msg00132.html

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