Post --> Note

Closes #1411

src/server/api/endpoints/aggregation/notes/reaction.ts

@@ -0,0 +1,76 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import Note from '../../../../../models/note';
+import Reaction from '../../../../../models/note-reaction';
+
+/**
+ * Aggregate reaction of a note
+ *
+ * @param {any} params
+ * @return {Promise<any>}
+ */
+module.exports = (params) => new Promise(async (res, rej) => {
+	// Get 'noteId' parameter
+	const [noteId, noteIdErr] = $(params.noteId).id().$;
+	if (noteIdErr) return rej('invalid noteId param');
+
+	// Lookup note
+	const note = await Note.findOne({
+		_id: noteId
+	});
+
+	if (note === null) {
+		return rej('note not found');
+	}
+
+	const datas = await Reaction
+		.aggregate([
+			{ $match: { noteId: note._id } },
+			{ $project: {
+				createdAt: { $add: ['$createdAt', 9 * 60 * 60 * 1000] } // Convert into JST
+			}},
+			{ $project: {
+				date: {
+					year: { $year: '$createdAt' },
+					month: { $month: '$createdAt' },
+					day: { $dayOfMonth: '$createdAt' }
+				}
+			}},
+			{ $group: {
+				_id: '$date',
+				count: { $sum: 1 }
+			}}
+		]);
+
+	datas.forEach(data => {
+		data.date = data._id;
+		delete data._id;
+	});
+
+	const graph = [];
+
+	for (let i = 0; i < 30; i++) {
+		const day = new Date(new Date().setDate(new Date().getDate() - i));
+
+		const data = datas.filter(d =>
+			d.date.year == day.getFullYear() && d.date.month == day.getMonth() + 1 && d.date.day == day.getDate()
+		)[0];
+
+		if (data) {
+			graph.push(data);
+		} else {
+			graph.push({
+				date: {
+					year: day.getFullYear(),
+					month: day.getMonth() + 1, // In JavaScript, month is zero-based.
+					day: day.getDate()
+				},
+				count: 0
+			});
+		}
+	}
+
+	res(graph);
+});