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/** * Vhost multiple JSGI apps. Optionally set a default app, and change the root * (`scriptName`) of an app. * * require('jsgi-vhoster').middleware( { * "site1.co.uk": jsgi_app, * "site2.co.uk": { app: jsgi_app, default: true } * } ) * * Keys are the host names to vhost on. The values must be either a function, * or an object with at least an `app` key. The full list of keys understood * is: * * - app (`Function`): the JSGI app to run on this host. * - default (`Boolean`): the default vhost if no host header is present, or * if it doesn't match anything * - scriptName (`String`): script name at which to root the app rather than * the default behaviour of `/` **/ exports.middleware = function vhoster( sites ) { var def, explicit_default_set = false; // Normalize and process sites. for ( var i in sites ) { if (typeof sites[ i ] == "function") sites[ i ] = { app: sites[ i ] } // No default yet - default to taking the first item if ( !def ) { def = i; if ( sites[ i ].default ) explicit_default_set = true; } else if ( sites[ i ].default ) { if ( explicit_default_set ) throw new Error("Explicit default already set to " + def); def = i; explicit_default_set = true; } if ( "scriptName" in sites ) { sites.scriptName = sites.scriptName.replace( /\/$/, '' ); } } var res_404 = { status: 404, headers: { "content-type": "text/html" }, body: [ "<h1>404 Not Found</h1>" ] } return function( req ) { var conf, host = "host" in req.headers ? req.headers.host.replace( /:\d+$/, '') : req.host; if ( host in sites ) conf = sites[ host ] else if ( def ) { conf = sites[ def ]; host = def; } else return res_404; // App has requested to live under a non '/' root. // TODO: might want some way of specifying multiple apps under a single // host. I don't need it now though. if ( conf.scriptName ) { var path = req.scriptName + req.pathInfo; if ( path.indexOf(conf.scriptName + "/") != 0 && path != conf.scriptName ) // No match - 404! return res_404; req.scriptName = conf.scriptName; req.pathInfo = path.substr( conf.scriptName.length ); } // Aaand finally, run the app return conf.app( req ); } }

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