Variable substitution for service source URLs

[etdube]

A GeoPrisma configuration (be it an XML file or DB config) currently contains project-specific (i.e. layers, datasources, widget definitions, etc.) and instance-specific (i.e. service URLs) settings. To make the deployment of a GeoPrisma project to a specific environment (e.g. development, test and production systems), that can be setup with different service URLs, we wish to make the service URLs configurable by a mechanism external to the XML file or DB config.

This ticket proposes a new feature for service sources, which would provide variable substitution in the service URLs. The variable values are to be retrieved from the PHP session variables. It is proposed that variable placeholders will follow this syntax ${GP_VARIABLE_NAME} (the GP_ prefix is mandatory, and VARIABLE_NAME can be substituted by any: valid alphanumeric identifier, with underscores being an accepted character as well). GeoPrisma will then try to match any placeholder following this pattern within the <source> elements in service definitions, and lookup a PHP session variable with the exact same name (e.g. GP_VARIABLE_NAME), then if the match is found, substitute the placeholder with the variable value when constructing the Service objects. If no session variable matching the same name is found, the placeholder is left as is.

[etdube]

Change committed in r1400

[adube]

etdube,

Thanks for the fix. Could you please make the according updates :

• run the site/php/service/test/test_sniffer.php script and make the according changes to follow the coding standards
• document this now feature in docs/source/concepts/index.rst, under 'services'
• add an entry to HISTORY.txt with this ticket number.
• it would be nice to have an new sample added showing this in action. Users often rely on samples to see how things work.

After all that, you can close the ticket. Thanks again for your work.

[adube]

It appears that r1400 broke the server part. All samples on www.geoprisma.org return errors 500. There must be a small typo in the provided fix.

Please, make the according changes to make it work again. Thanks.

[etdube]

Fixed and updates (coding standards, documentation, HISTORY.txt and sample) done.