1 files changed, 68 insertions, 0 deletions
diff --git a/src/api/endpoints/posts/context.ts b/src/api/endpoints/posts/context.ts
new file mode 100644
index 0000000000..5b0a56f356
--- /dev/null
+++ b/src/api/endpoints/posts/context.ts
@@ -0,0 +1,68 @@
+'use strict';
+
+/**
+ * Module dependencies
+ */
+import it from '../../it';
+import Post from '../../models/post';
+import serialize from '../../serializers/post';
+
+/**
+ * Show a context 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] = it(params.post_id, 'id', true);
+	if (postIdErr) return rej('invalid post_id param');
+
+	// Get 'limit' parameter
+	const [limit, limitErr] = it(params.limit).expect.number().range(1, 100).default(10).qed();
+	if (limitErr) return rej('invalid limit param');
+
+	// Get 'offset' parameter
+	const [offset, offsetErr] = it(params.offset).expect.number().min(0).default(0).qed();
+	if (offsetErr) return rej('invalid offset param');
+
+	// Lookup post
+	const post = await Post.findOne({
+		_id: postId
+	});
+
+	if (post === null) {
+		return rej('post not found');
+	}
+
+	const context = [];
+	let i = 0;
+
+	async function get(id) {
+		i++;
+		const p = await Post.findOne({ _id: id });
+
+		if (i > offset) {
+			context.push(p);
+		}
+
+		if (context.length == limit) {
+			return;
+		}
+
+		if (p.reply_to_id) {
+			await get(p.reply_to_id);
+		}
+	}
+
+	if (post.reply_to_id) {
+		await get(post.reply_to_id);
+	}
+
+	// Serialize
+	res(await Promise.all(context.map(async post =>
+		await serialize(post, user))));
+});