Introduce processor

src/server/api/endpoints/posts/reposts.ts

@@ -0,0 +1,73 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import Post, { pack } from '../../models/post';
+
+/**
+ * Show a reposts of a post
+ *
+ * @param {any} params
+ * @param {any} user
+ * @return {Promise<any>}
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	// Get 'post_id' parameter
+	const [postId, postIdErr] = $(params.post_id).id().$;
+	if (postIdErr) return rej('invalid post_id param');
+
+	// Get 'limit' parameter
+	const [limit = 10, limitErr] = $(params.limit).optional.number().range(1, 100).$;
+	if (limitErr) return rej('invalid limit param');
+
+	// Get 'since_id' parameter
+	const [sinceId, sinceIdErr] = $(params.since_id).optional.id().$;
+	if (sinceIdErr) return rej('invalid since_id param');
+
+	// Get 'until_id' parameter
+	const [untilId, untilIdErr] = $(params.until_id).optional.id().$;
+	if (untilIdErr) return rej('invalid until_id param');
+
+	// Check if both of since_id and until_id is specified
+	if (sinceId && untilId) {
+		return rej('cannot set since_id and until_id');
+	}
+
+	// Lookup post
+	const post = await Post.findOne({
+		_id: postId
+	});
+
+	if (post === null) {
+		return rej('post not found');
+	}
+
+	// Construct query
+	const sort = {
+		_id: -1
+	};
+	const query = {
+		repost_id: post._id
+	} as any;
+	if (sinceId) {
+		sort._id = 1;
+		query._id = {
+			$gt: sinceId
+		};
+	} else if (untilId) {
+		query._id = {
+			$lt: untilId
+		};
+	}
+
+	// Issue query
+	const reposts = await Post
+		.find(query, {
+			limit: limit,
+			sort: sort
+		});
+
+	// Serialize
+	res(await Promise.all(reposts.map(async post =>
+		await pack(post, user))));
+});