Add map layer functions to database interface

lib/www/server/lib/db/gis/project/index.js

@@ -3,5 +3,6 @@ module.exports = {
 	bbox: require('./bbox'),
 	preplot: require('./preplot'),
 	raw: require('./raw'),
-	final: require('./final')
+	final: require('./final'),
+	layer: require('./layer')
 };

lib/www/server/lib/db/gis/project/layer/get.js

@@ -0,0 +1,28 @@
+
+const { setSurvey } = require('../../../connection');
+
+async function get (projectId, layerName, options = {}) {
+
+	const client = await setSurvey(projectId);
+
+	const text = `
+		SELECT (data->>'data')::json data
+		FROM file_data
+		WHERE data->>'type' = 'map_layer'
+			AND data->>'format' = 'geojson'
+			AND data->>'name' = $1;
+	`;
+
+	const values = [ layerName ];
+
+	const res = await client.query(text, values);
+	client.release();
+
+	if (res.rows && res.rows.length) {
+		return res.rows.map(row => row.data);
+	} else {
+		throw {status: 404};
+	}
+}
+
+module.exports = get;

lib/www/server/lib/db/gis/project/layer/index.js

@@ -0,0 +1,5 @@
+
+module.exports = {
+	list: require('./list'),
+	get: require('./get')
+};

lib/www/server/lib/db/gis/project/layer/list.js

@@ -0,0 +1,25 @@
+
+const { setSurvey } = require('../../../connection');
+
+async function list (projectId, options = {}) {
+
+	const client = await setSurvey(projectId);
+
+	const text = `
+		SELECT DISTINCT data->>'name' name
+		FROM file_data
+		WHERE data->>'type' = 'map_layer'
+			AND data->>'format' = 'geojson';
+	`;
+
+	const res = await client.query(text);
+	client.release();
+
+	if (res.rows && res.rows.length) {
+		return res.rows.map(row => row.name);
+	} else {
+		throw {status: 404};
+	}
+}
+
+module.exports = list;