History: System Configuration

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            ! System configuration

^ Introduced in ((Tiki8)) ^

System configuration allows for system administrators to set some ((preferences)) using the file system rather than the Tiki database. By providing an INI file, administrators can have a central configuration for all of their Tiki installations. 

Preferences set via system configuration files cannot be set via Tiki. Preferences will not show in Tiki when they are set via system configuration, unless the "Unavailable" filter is checked.

New in ((Tiki10)): Option to load the modules from a static files ( in profile YAML format like http://profiles.tiki.org/Module+Handler ). Search for "Module file" in the admin panel

New in ((Tiki11)): A file db/preconfiguration.php can contain database credentials which are suggested at first Tiki installation. This allows providers of Virtual Servers to preconfigure mysql with different random passwords and usernames before the customers access the Tiki installer.

^New in ((Tiki15)): Due to changes in Zend libraries, it is no longer possible to have hierarchical setting of configurations as before.  In addition, configuration names can no longer contain dots. For example, [client1.example.com] will not work. Use [client1] instead. Old configurations may not be usable in Tiki 15 and have to be rewritten.^

New in ((Tiki20)): Hide classes of preferences that are disabled

New in ((Tiki20)): [https://sourceforge.net/p/tikiwiki/code/69625|Permit to hide preferences from admin panel]



!! Possible uses for Tiki Farms and hosting companies
* Connect to other services, such as BigBlueButton, without intervention from the users
* Configure advanced settings such as Memcache
* Disable features that are not part of the support plan
* Respond to security advisories  by globally disabling a feature
* provide tiki_p_admin but make some features inaccessible
* Hosting company may want to offer all-in-one hosting, but restrict usage of 
** experimental features
** feature that can be used to gain server access (which is OK for most setups, but not cool for a WikiFarm)
* Consulting company wants to make simpler admin panels for a customer
* Using Tiki as an application builder (((framework)))


!! Activate the system configuration
The system configuration must be enabled from the db/local.php file. Installations created from Tiki8 and beyond contain samples in the file created by default.

{CODE(caption=Sample configuration in db/local.php to an absolute path)}
$system_configuration_file = '/etc/tiki.ini';
$system_configuration_identifier = 'client1';
{CODE}

{CODE(caption=Another sample configuration in db/local.php, with a relative path)}
$system_configuration_file = 'db/tiki.ini';
$system_configuration_identifier = 'client1';
{CODE}
If you do this example, make sure .htaccess is active so the tiki.ini can't be read.

{CODE(caption=Another sample configuration in db/local.php, with a relative path pointing outside the web accessible directory)}
$system_configuration_file = '$system_configuration_file = 'db/../../tiki.ini';
$system_configuration_identifier = 'client1';
{CODE}
If you do this example, put tiki.ini above the web directory. Ex.: if your db/local is here:
/home/tiki/domains/dev.tiki.org/public_html/db/local.php
Your tiki.ini goes here:
/home/tiki/domains/dev.tiki.org/tiki.ini


When enabled, Tiki will read additional directives from the configuration file based on the selected identifier. The identifier is arbitrary, but can be used either to specify the site or the plan. In the configuration file, multiple configurations can be defined and inheritance can be used. (see sample of .ini file below for better understanding)

!!System configuration files contents

Configuration files are [https://en.wikipedia.org/wiki/INI_file|INI files]. The following example file defines the browser title to be "Test".
{CODE(caption=INI file example #1)}
preference.browsertitle = Test
{CODE}

Values can be quoted using double quotes. Quoted values can span several lines. Backslashes in values escape double quotes and backslashes.

{CODE(caption=Sample INI file)}
[global]
preference.feature_wysiwyg = "n"
preference.feature_sefurl = "y"
preference.helpurl = "http://support.example.com/"
; ... more settings ...

[basic : global]
; ... this hierarchical block no longer works from Tiki 15 onwards
preference.feature_wiki = "y"
preference.feature_forums = "n"
preference.feature_trackers = "n"
; ... more settings ...

[pro : global]
; ... this hierarchical block no longer works from Tiki 15 onwards
preference.feature_wiki = "y"
; BBB configured, but user can still toggle on/off
preference.bigbluebutton_server_location = "bbb.example.com"
preference.bigbluebutton_server_salt = "1234abcd1234abcd"
; ... more settings ...

[client1 : pro]
; ... this hierarchical block no longer works from Tiki 15 onwards, but [client1] will
preference.browsertitle = "Client #1 Intranet"
preference.sender_email = client1@example.com
{CODE}

In the example above, the following preferences would be set for using the identifier ''client1'':
* feature_wysiwyg = n
* feature_sefurl = y
* helpurl = http://support.example.com/
* feature_wiki = y
* bigbluebutton_server_location = bbb.example.com
* bigbluebutton_server_salt = 1234abcd1234abcd
* browsertitle = Client #1 Intranet
* sender_email = client1@example.com


Lines starting with semi-colons (";") are comments.

!!! Protecting ini file content when stored in a location accessible from the web

Some times, the system configuration files need to reside in a folder that potentially can be accessible from the web. In that case the system configuration file content may be accessible from the web, that is not desired.
Tiki supports also '.ini.php' files, that will work in the same way as the normal '.ini' files, but avoid the content to be downloaded from the internet, by using the right header in the '.ini.php' file.

{CODE(caption=Sample INI.PHP file. Eg. tiki.ini.php)}
<?php
// This script may only be included - so it is better to die if called directly.
// Keep this block to avoid the content to be read from the internet.
if (strpos($_SERVER['SCRIPT_NAME'], basename(__FILE__)) !== false) {
	header('location: index.php');
	exit;
}
?>
[global]
preference.feature_wysiwyg = "n"
preference.feature_sefurl = "y"
preference.helpurl = "http://support.example.com/"
; ... more settings ...
{CODE}

!!! Disable classes of preferences
Preferences can be disabled by setting a value to each of them individually. However, this process may be long and will require maintenance with the evolutions of Tiki. 

Tiki allows to set multiple rule priorities, each verification priority can allow or deny a preference. Rules can be specified at various levels, just like the preference overrides above.

{CODE(caption=Various rules)}
[global]
rules.0 = deny experimental new

[pro : global]
; ... this hierarchical block no longer works from Tiki 15 onwards
rules.5 = allow new
rules.10 = allow feature_wysiwyg
{CODE}

In the previous example, sites using the pro identifier would be allowed to use new features and wysiwyg (which is tagged as experimental), including new experimental features, but still be denied old experimental features. Higher priorities are evaluated first and the lookup stops once there is a match.

A draconian provider could use something like this:

{CODE(caption=Draconian provider configuration)}
[global]
rules.0 = deny all
rules.1 = allow basic
{CODE}

The preferences need to be tagged in the definitions using the 'tags' key containing an array. Unless specified otherwise, all preferences are considered 'advanced'.

!!!! Hide classes of preferences that are disabled

If additionally you want to hide from the admin interface preferences that you disabled, you can use the keyword 'hide' instead of 'deny' this act as if it was the normal 'deny' but additionally will avoid displaying the value in the admin interface.

{CODE(caption=Hide preferences rules)}
[global]
rules.0 = hide experimental new
{CODE}

!!! Array syntax
Instead of…
{CODE()}preference.flaggedrev_approval_categories = "40;41;97;231"
{CODE}

…the syntax to define preference.flaggedrev_approval_categories as an array of 4 elements would be…
{CODE(caption="How to set an array")}preference.flaggedrev_approval_categories.0 = "40"
preference.flaggedrev_approval_categories.1 = "41"
preference.flaggedrev_approval_categories.2 = "97"
preference.flaggedrev_approval_categories.3 = "231"{CODE}

…or…
{CODE(caption="How to set an array")}preference.flaggedrev_approval_categories[] = "40"
preference.flaggedrev_approval_categories[] = "41"
preference.flaggedrev_approval_categories[] = "97"
preference.flaggedrev_approval_categories[] = "231"{CODE}


! Preconfiguration file

When providing on-demand Virtual Machines with Tiki pre-loaded, hosting companies can provide mysql with a database and connection credentials which are different for each customer.
When accessing stage __Set the Database Connection__ of the installer, these values will be prefilled for the customer. This is more efficient than providing them by mail or other means.
These information can obviously not be contained in db/local.php since local.php does not yet exist.

All there is to do is uncomment the appropriate lines in file db/preconfiguration.php and fill the appropriate values:
{CODE(caption="db/preconfiguration.php" wrap="1" colors="php")}<?php
// This is Tiki's preconfiguration file.
// This holds values which can provide preconfiguration values in the installer, when local.php does not yet exist
// Uncomment and change values as appropriate
$host_tiki_preconfig='localhost';
$user_tiki_preconfig='tiki';
$pass_tiki_preconfig='password';
$dbs_tiki_preconfig='tiki_db';
{CODE}

! Environment variable configuration

Tiki will also read information about the database connection and system configuration through environment variables. These can be set through the web server's configuration.

{CODE(caption="Sample nginx configuration")}
fastcgi_pass unix:/var/run/php5-fpm.sock;
fastcgi_index route.php;
include fastcgi_params;
fastcgi_param MYSQLCONNSTR_Tiki "Database=client1;Data Source=localhost;User Id=client1;Password=secret";
fastcgi_param TIKI_INI_FILE "/etc/tiki.ini";
fastcgi_param TIKI_INI_IDENTIFIER "client1";
{CODE}

-=Related=-
* ((TRIM))
* ((Multitiki))

(alias(Tiki.ini File)) | (alias(Tiki.ini)) | (alias(INI))