Add beginning of a metadata aggregation service.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@876 44740490-163a-0410-bde0-09ae8108e29a

modules/aggregator/config-template/aggregator.php

+<?php
+
+/* Configuration for the aggregator module. */
+$config = array(
+
+	/* List of aggregators. */
+	'aggragators' => array(
+		'example' => array(
+			array('type' => 'flatfile'),  /* Metadata from metadata-directory. */
+			array('type' => 'xml', 'url' => 'https://idp.example.org/Metadata'),
+			array('type' => 'xml', 'file' => 'static-metadata.xml'),
+		),
+	),
+
+);
+
+?>
\ No newline at end of file

modules/aggregator/www/index.php

+<?php
+
+/* Types of metadata. */
+$metadataSets = array(
+	'saml20-idp-remote',
+	'saml20-sp-remote',
+	'shib13-idp-remote',
+	'shib13-sp-remote',
+	);
+
+$globalConfig = SimpleSAML_Configuration::getInstance();
+$aggregatorConfig = $globalConfig->copyFromBase('aggregator', 'aggregator.php');
+
+$aggregators = $aggregatorConfig->getArray('aggragators');
+
+if (!array_key_exists('id', $_GET)) {
+	/* TODO: Show list. */
+	echo('TODO: Show list');
+	exit;
+}
+
+$id = $_GET['id'];
+if (!array_key_exists($id, $aggregators)) {
+	throw new SimpleSAML_Error_NotFound('No aggregator with id ' . var_export($id, TRUE) . ' found.');
+}
+
+
+/* Parse metadata sources. */
+$sources = $aggregators[$id];
+if (!is_array($sources)) {
+	throw new Exception('Invalid aggregator source configuration for aggregator ' .
+		var_export($id, TRUE) . ': Aggregator wasn\'t an array.');
+};
+
+try {
+	$sources = SimpleSAML_Metadata_MetaDataStorageSource::parseSources($sources);
+} catch (Exception $e) {
+	throw new Exception('Invalid aggregator source configuration for aggregator ' .
+		var_export($id, TRUE) . ': ' . $e->getMessage());
+}
+
+/* Find list of all available entities. */
+$entities = array();
+foreach ($sources as $source) {
+	foreach ($metadataSets as $set) {
+		foreach ($source->getMetadataSet($set) as $entityId => $metadata) {
+			if (!array_key_exists($entityId, $entities)) {
+				$entities[$entityId] = array();
+			}
+
+			if (array_key_exists($set, $entities[$entityId])) {
+				/* Entity already has metadata for the given set. */
+				continue;
+			}
+
+			$entities[$entityId][$set] = $metadata;
+		}
+	}
+}
+
+$xml = new DOMDocument();
+$entitiesDescriptor = $xml->createElementNS('urn:oasis:names:tc:SAML:2.0:metadata', 'EntitiesDescriptor');
+$xml->appendChild($entitiesDescriptor);
+
+/* Build EntityDescriptor elements for them. */
+foreach ($entities as $entity => $sets) {
+
+	$entityDescriptor = NULL;
+	foreach ($sets as $set => $metadata) {
+		if (!array_key_exists('entityDescriptor', $metadata)) {
+			/* One of the sets doesn't contain an EntityDescriptor element. */
+			$entityDescriptor = FALSE;
+			break;
+		}
+
+		if ($entityDescriptor == NULL) {
+			/* First EntityDescriptor elements. */
+			$entityDescriptor = $metadata['entityDescriptor'];
+			continue;
+		}
+
+		assert('is_string($entityDescriptor)');
+		if ($entityDescriptor !== $metadata['entityDescriptor']) {
+			/* Entity contains multiple different EntityDescriptor elements. */
+			$entityDescriptor = FALSE;
+			break;
+		}
+	}
+
+	if (is_string($entityDescriptor)) {
+		/* All metadata sets for the entity contain the same entity descriptor. Use that one. */
+		$tmp = new DOMDocument();
+		$tmp->loadXML(base64_decode($entityDescriptor));
+		$entityDescriptor = $tmp->documentElement;
+	} else {
+		$tmp = new SimpleSAML_Metadata_SAMLBuilder($entity);
+		foreach ($sets as $set => $metadata) {
+			$tmp->addMetadata($set, $metadata);
+		}
+		$entityDescriptor = $tmp->getEntityDescriptor();
+	}
+
+	$entitiesDescriptor->appendChild($xml->importNode($entityDescriptor, TRUE));
+}
+
+/* Show the metadata. */
+if(array_key_exists('mimetype', $_GET)) {
+	$mimeType = $_GET['mimetype'];
+} else {
+	$mimeType = 'application/samlmetadata+xml';
+}
+header('Content-Type: ' . $mimeType);
+
+echo($xml->saveXML());
+
+
+?>
\ No newline at end of file