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PHP SAPI module for Virtuoso

This is a SAPI module for PHP 5.x, implemented as a Virtuoso loadable module.

Building php

To build the plugin, you first need to build a libphp5.so configured with ZTS.

    Package	Version		From
    -------	-------		-----------------------------
    php		5.6.35		http://www.php.net/downloads/

In the php source directory, execute something similar to:

	./configure \
		--prefix=/usr/local/php-5.2.10 \
		--enable-maintainer-zts \
		--enable-embed=shared \
		--with-config-file-path=. \
		--with-tsrm-pthreads \
		--disable-static \
		--disable-cgi \
		--disable-ipv6 \
		--without-mysql \
		--without-pear \
		--enable-bcmath=shared \
		--enable-calendar \
		--enable-dbase=shared \
		--enable-dba=shared \
		--enable-dom=shared \
		--enable-exif=shared \
		--enable-ftp=shared \
		--enable-gd-native-ttf \
		--enable-mbstring=shared \
		--enable-pdo \
		--enable-shmop=shared \
		--enable-soap=shared \
		--enable-sockets=shared \
		--enable-sysvmsg=shared \
		--enable-sysvsem=shared \
		--enable-sysvshm=shared \
		--enable-wddx=shared \
		--enable-xmlreader=shared \
		--enable-xmlwriter=shared \
		--with-bz2=shared \
		--with-curl=shared \
		--with-gd=shared \
		--with-iodbc=/usr/local/iODBC \
		--with-ldap=shared \
		--with-mime-magic=shared \
		--with-openssl=shared \
		--with-pdo-odbc="generic,/usr/local/iODBC,iodbc,-L/usr/local/iODBC/lib,-I/usr/local/iODBC/include" \
		--with-sqlite=shared \
		--with-xmlrpc=shared \
		--with-xsl=shared \
		--with-xsl=shared \
		--with-zlib \
		...

NOTE: The options above require a number of other libraries to be installed prior to building PHP. On systems where these external libraries are not available as system libraries you may need additional configure options to point where certain libraries are installed.

Next build and install the php packages.

	make

	make install

In the Virtuoso Open Source directory, execute the following command:

	./configure .... --enable-php5=/usr/local/php-5.2.10 ......

or if you configured Virtuoso before in this directory:

	./config.nice --enable-php5=/usr/local/php-5.2.10

so the build process knows where to find the necessary PHP header files.

At the end of the configure step, the summary screen should indicate that the BUILD_OPTS includes "php5". If this is not the case the config.log file should contain information why configure was unable to locate your php5 installation.

Installation

  1. Copy the libphp5.so into same directory where virtuoso installs the hosting_php5.so plugin e.g.
PREFIX/hosting/libphp5.so.
  1. If you have build PHP with shared extensions, you can copy them in
PREFIX/hosting/php
  1. Copy the php.ini-recommended from the php distro to the same directory as your virtuoso.ini e.g.
PREFIX/database/php.ini.
  1. Edit your php.ini to change the extensions_dir setting to the directory where you put your extensions, e.g.:
extensions_dir = PREFIX/hosting/php
  1. Register the plugin in your virtuoso.ini:
    [Plugins]
    ..
    Load7 = attach, libphp5.so
    Load8 = Hosting, hosting_php.so

This will enable the hosting_php plugin to dynamically hook into the PHP library.

Virtuoso PHP Extensions

Settings

The Virtuoso php hosting plugin adds the following default settings to the php.ini file:

	[Virtuoso]
	virtuoso.logging = On
	virtuoso.local_dsn = Local Virtuoso
	virtuoso.allow_dba = 0

If virtuoso.logging is On, all php messages are passed back to the virtuoso logwriter.

The virtuoso.local_dsn is by default set to "Local Virtuoso" which is the DSN in your odbc.ini file normally associated with your local virtuoso database.

The virtuoso.allow_dba option rejects the use of the dba uid when using __virt_internal_dsn().

Functions

__virt_internal_dsn([optional dsn])

Normally when programming a PHP application you have to store datasource, username and password credentials for making ODBC connections back into the database. This can be a security risk and requires the administrator to fix scripts manually when he wants to run a hosted application under its own sql account.

The __virt_internal_dsn() function returns an ODBC connect string based on the VSP user that owns the Virtual Directory.

It starts by verifying that the Virtual Directory has been properly setup and that there is a valid user that has not been disabled and is allowed to make SQL connections, else it will log a message and return FALSE.

If the user is a system privileged user like dba or dav and the virtuoso.allow.dba setting is disabled, the function will log a message and return FALSE.

The function will return an ODBC SQLDriverConnect string using either the supplied optional_dsn or the virtuoso.local_dsn and the uid/pwd credentials of the virtual directory in the form:

DSN=use_dsn;UID=uid;PWD=pwd

This string can be used directly with the odbc_connect function in your script. If you want your PHP application also outside of the virtuoso hosting environment, you can use it like this:

  <?php
	//
	// ODBC Connection Variables
	//
	$o_DSN = 'ChangeMe';
	$o_UID = 'ChangeMe';
	$o_PWD = 'ChangeMe';

	if (function_exists ('__virt_internal_dsn')) {
		$db = odbc_connect (__virt_internal_dsn(), null, null);
	} else {
		$db = odbc_connect ($o_DSN, $o_UID, $o_PWD);
	}

	if (!$db)
		error_log ('odbc_connect failed');

	// .....

	odbc_disconnect ($db);
  ?>

Here is an example of a Virtuoso SQL script that creates a database schema and a table, a user that owns the schema and a vhost entry that can be used for a PHP application.

myapp.sql:

    --
    --  Sample script
    --

    --
    --  Create the MYAPP schema
    --
    use MYAPP
    ;

    --
    --  Create a user MYADMIN who owns the table in this schema
    --
    db.dba.user_create (
	'MYADMIN',				-- Account name
	uuid (),				-- Random UUID as password
        vector ('LOGIN_QUALIFIER', 'MYAPP',
                'SQL_ENABLE', 1,
                'DAV_ENABLE', 0,
                'FULL_NAME', 'MYAPP Administrator'))
    ;

    --
    --  Create the tables in this schema
    --
    create table MYTABLE (
	mt_id INTEGER NOT NULL PRIMARY KEY,
        mt_value VARCHAR (32)
    )
    ;

    --
    --  Insert some sample data
    --
    insert into MYAPP.DBA.MYTABLE VALUES (1, 'Apple');
    insert into MYAPP.DBA.MYTABLE VALUES (2, 'Pear');
    insert into MYAPP.DBA.MYTABLE VALUES (3, 'Banana');
    insert into MYAPP.DBA.MYTABLE VALUES (4, 'Pineapple');
  
    --
    --  Add permissions
    --
    grant all privileges on MYAPP.DBA.MYTABLE to MYADMIN
    ;

    --
    --  Create a new virtual path in Virtuoso
    --
    --  Point to $VIRTUOSO/vsp/testapp on filesystem
    --
    db.dba.vhost_remove (lpath=>'/myapp');
    db.dba.vhost_define (
	lpath=>'/myapp', 
	ppath=>'/testapp', 
	is_dav=>0, 
	is_brws=>0, 
	vsp_user=>'MYADMIN', 
	def_page=>'myapp.php')
    ;

    --
    --  End of sample
    --

And the $VIRTUOSO/vsp/testapp/myapp.php:

    <?php
	$db = odbc_connect (__virt_internal_dsn(), null, null);
	if (!$db)
		error_log ('odbc_connect failed');

        $rs = odbc_exec ($db, 'select * from MYAPP.DBA.MYTEST');

	odbc_result_all ($rs);

	odbc_close ($db);
    ?>