Initial commit :four_leaf_clover:

1 files changed, 83 insertions, 0 deletions

diff --git a/src/api/endpoints/posts/context.js b/src/api/endpoints/posts/context.js
new file mode 100644
index 0000000000..5f040b8505
--- /dev/null
+++ b/src/api/endpoints/posts/context.js
@@ -0,0 +1,83 @@
+'use strict';
+
+/**
+ * Module dependencies
+ */
+import * as mongo from 'mongodb';
+import Post from '../../models/post';
+import serialize from '../../serializers/post';
+
+/**
+ * Show a context of a post
+ *
+ * @param {Object} params
+ * @param {Object} user
+ * @return {Promise<object>}
+ */
+module.exports = (params, user) =>
+	new Promise(async (res, rej) =>
+{
+	// Get 'post_id' parameter
+	const postId = params.post_id;
+	if (postId === undefined || postId === null) {
+		return rej('post_id is required');
+	}
+
+	// Get 'limit' parameter
+	let limit = params.limit;
+	if (limit !== undefined && limit !== null) {
+		limit = parseInt(limit, 10);
+
+		// From 1 to 100
+		if (!(1 <= limit && limit <= 100)) {
+			return rej('invalid limit range');
+		}
+	} else {
+		limit = 10;
+	}
+
+	// Get 'offset' parameter
+	let offset = params.offset;
+	if (offset !== undefined && offset !== null) {
+		offset = parseInt(offset, 10);
+	} else {
+		offset = 0;
+	}
+
+	// Lookup post
+	const post = await Post.findOne({
+		_id: new mongo.ObjectID(postId)
+	});
+
+	if (post === null) {
+		return rej('post not found', '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))));
+});