API: Add label querying endpoint.

Labels can be associated with events and can have
display properties such as a description and colour,
this is why we need an endpoint for the client to
retrieve them.

lib/www/server/api/index.js

@@ -90,6 +90,10 @@ app.map({
 // 		get: [ mw.event.get ],
 // 		put: [ mw.event.put ],
 // 	},
+	'/project/:project/label/': {
+		get: [ mw.label.list ],
+// 		post: [ mw.label.post ],
+	},
 //
 // 	'/project/:id/permissions/:mode(read|write)?': {
 // 		get: [ mw.permissions.get ],

lib/www/server/api/middleware/index.js

@@ -5,5 +5,6 @@ module.exports = {
 	sequence: require('./sequence'),
 	user: require('./user'),
 	auth: require('./auth'),
-	gis: require('./gis')
+	gis: require('./gis'),
+	label: require('./label')
 };

lib/www/server/api/middleware/label/index.js

@@ -0,0 +1,8 @@
+
+module.exports = {
+	list: require('./list'),
+	get: require('./get'),
+	post: require('./post'),
+	put: require('./put'),
+	delete: require('./delete')
+}

lib/www/server/api/middleware/label/list.js

@@ -0,0 +1,9 @@
+
+const { label } = require('../../../lib/db');
+
+module.exports = async function (req, res, next) {
+
+	res.status(200).send(await label.list(req.params.project, req.query));
+	next();
+
+};

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

@@ -5,4 +5,5 @@ module.exports = {
 	sequence: require('./sequence'),
 	event: require('./event'),
 	gis: require('./gis'),
+	label: require('./label')
 };

lib/www/server/lib/db/label/index.js

@@ -0,0 +1,8 @@
+
+module.exports = {
+	list: require('./list'),
+	get: require('./get'),
+	post: require('./post'),
+	put: require('./put'),
+	delete: require('./delete')
+}

lib/www/server/lib/db/label/list.js

@@ -0,0 +1,16 @@
+const { pool } = require('../connection');
+
+async function list (projectId, opts = {}) {
+	await pool.query("CALL set_survey($1);", [projectId]);
+
+	const text = `
+		SELECT *
+		FROM labels
+		ORDER BY name;
+	`;
+
+	const res = await pool.query(text);
+	return res.rows;
+}
+
+module.exports = list;