LitCalMetadata.php

<?php

include_once( 'includes/enums/RomanMissal.php' );

$requestHeaders = getallheaders();
if( isset( $requestHeaders[ "Origin" ] ) ) {
    header( "Access-Control-Allow-Origin: {$requestHeaders[ "Origin" ]}" );
    header( 'Access-Control-Allow-Credentials: true' );
}
else {
    header( 'Access-Control-Allow-Origin: *' );
}
header( 'Access-Control-Max-Age: 86400' );    // cache for 1 day
header( 'Cache-Control: must-revalidate, max-age=259200' );
header( 'Content-Type: application/json' );

$widerRegionCalendars = [];
foreach (glob("nations/*.json") as $filename) {
    $widerRegionCalendars[] = strtoupper( basename($filename, ".json") );
}

$baseNationalCalendars = [ "VATICAN" ];
$directories = array_map('basename', glob( 'nations/*' , GLOB_ONLYDIR) );
foreach( $directories as $directory ) {
    if( file_exists( "nations/$directory/$directory.json" ) ) {
        $baseNationalCalendars[] = $directory;
    }
}

if( file_exists( 'nations/index.json' ) ) {
    $index = file_get_contents( 'nations/index.json' );
    if( $index !== false ) {
        $diocesanCalendars  = json_decode( $index, true );
        $nationalCalendars  = [];
        $diocesanGroups     = [];
        $nationalCalendarsMetadata = [];
        foreach( $diocesanCalendars as $key => $value ) {
            unset( $diocesanCalendars[$key]["path"] );
            if( array_key_exists( "group", $value ) && $value !== "" ) {
                if( !array_key_exists($value["group"], $diocesanGroups) ) {
                    $diocesanGroups[$value["group"]] = [];
                }
                $diocesanGroups[$value["group"]][] = $key;
            }
            if( !array_key_exists($diocesanCalendars[$key]["nation"], $nationalCalendars) ) {
                $nationalCalendars[$diocesanCalendars[$key]["nation"]] = [];
                $nationalCalendarsMetadata[$diocesanCalendars[$key]["nation"]] = [
                    "missals" => [],
                    "widerRegions" => [],
                    "dioceses" => [],
                    "settings" => []
                ];
            }
            $nationalCalendars[$diocesanCalendars[$key]["nation"]][] = $key;
            $nationalCalendarsMetadata[$diocesanCalendars[$key]["nation"]]["dioceses"][] = $key;
        }

        foreach( $baseNationalCalendars as $nation ) {
            if( !array_key_exists( $nation, $nationalCalendars ) ) {
                $nationalCalendars[$nation] = [];
            }
            if( file_exists( "nations/$nation/$nation.json" ) ) {
                $nationData = json_decode( file_get_contents( "nations/$nation/$nation.json" ) );
                $nationalCalendarsMetadata[$nation]["missals"] = $nationData->Metadata->Missals;
                $nationalCalendarsMetadata[$nation]["widerRegions"][] = $nationData->Metadata->WiderRegion->name;
                $nationalCalendarsMetadata[$nation]["settings"] = $nationData->Settings;
            }
        }
        $filterDirResults = ['..', '.', 'index.json'];
        $dirResults = array_diff( scandir('nations'), $filterDirResults );
        $widerRegionsFiles = array_values( array_filter( $dirResults, function($el) {
            return !is_dir('nations/' . $el) && pathinfo('nations/' . $el, PATHINFO_EXTENSION) === 'json';
        }) );
        $widerRegionsNames = array_map( function($el){
            return pathinfo('nations/' . $el, PATHINFO_FILENAME);
        }, $widerRegionsFiles );

        $response = json_encode( [
            "LitCalMetadata" => [
                "NationalCalendars" => $nationalCalendars,
                "NationalCalendarsMetadata" => $nationalCalendarsMetadata,
                "DiocesanCalendars" => $diocesanCalendars,
                "DiocesanGroups"    => $diocesanGroups,
                "WiderRegions"      => $widerRegionsNames,
                "RomanMissals"      => RomanMissal::produceMetadata()
            ]
        ], JSON_PRETTY_PRINT );
        $responseHash = md5( $response );
        header("Etag: \"{$responseHash}\"");
        if (!empty( $_SERVER['HTTP_IF_NONE_MATCH'] ) && $_SERVER['HTTP_IF_NONE_MATCH'] === $responseHash) {
            header( $_SERVER[ "SERVER_PROTOCOL" ] . " 304 Not Modified" );
            header('Content-Length: 0');
        } else {
            echo $response;
        }
    } else {
        http_response_code(503);
    }
} else {
    http_response_code(404);
}
die();
?>