Initial commit 🍀

src/api/endpoints/posts/search.js

@@ -0,0 +1,138 @@
+'use strict';
+
+/**
+ * Module dependencies
+ */
+import * as mongo from 'mongodb';
+import Post from '../../models/post';
+import serialize from '../../serializers/post';
+const escapeRegexp = require('escape-regexp');
+
+/**
+ * Search a post
+ *
+ * @param {Object} params
+ * @param {Object} me
+ * @return {Promise<object>}
+ */
+module.exports = (params, me) =>
+	new Promise(async (res, rej) =>
+{
+	// Get 'query' parameter
+	let query = params.query;
+	if (query === undefined || query === null || query.trim() === '') {
+		return rej('query is required');
+	}
+
+	// Get 'offset' parameter
+	let offset = params.offset;
+	if (offset !== undefined && offset !== null) {
+		offset = parseInt(offset, 10);
+	} else {
+		offset = 0;
+	}
+
+	// Get 'max' parameter
+	let max = params.max;
+	if (max !== undefined && max !== null) {
+		max = parseInt(max, 10);
+
+		// From 1 to 30
+		if (!(1 <= max && max <= 30)) {
+			return rej('invalid max range');
+		}
+	} else {
+		max = 10;
+	}
+
+	// If Elasticsearch is available, search by it
+	// If not, search by MongoDB
+	(config.elasticsearch.enable ? byElasticsearch : byNative)
+		(res, rej, me, query, offset, max);
+});
+
+// Search by MongoDB
+async function byNative(res, rej, me, query, offset, max) {
+	const escapedQuery = escapeRegexp(query);
+
+	// Search posts
+	const posts = await Post
+		.find({
+			text: new RegExp(escapedQuery)
+		}, {
+			sort: {
+				_id: -1
+			},
+			limit: max,
+			skip: offset
+		})
+		.toArray();
+
+	// Serialize
+	res(await Promise.all(posts.map(async post =>
+		await serialize(post, me))));
+}
+
+// Search by Elasticsearch
+async function byElasticsearch(res, rej, me, query, offset, max) {
+	const es = require('../../db/elasticsearch');
+
+	es.search({
+		index: 'misskey',
+		type: 'post',
+		body: {
+			size: max,
+			from: offset,
+			query: {
+				simple_query_string: {
+					fields: ['text'],
+					query: query,
+					default_operator: 'and'
+				}
+			},
+			sort: [
+				{ _doc: 'desc' }
+			],
+			highlight: {
+				pre_tags: ['<mark>'],
+				post_tags: ['</mark>'],
+				encoder: 'html',
+				fields: {
+					text: {}
+				}
+			}
+		}
+	}, async (error, response) => {
+		if (error) {
+			console.error(error);
+			return res(500);
+		}
+
+		if (response.hits.total === 0) {
+			return res([]);
+		}
+
+		const hits = response.hits.hits.map(hit => new mongo.ObjectID(hit._id));
+
+		// Fetxh found posts
+		const posts = await Post
+			.find({
+				_id: {
+					$in: hits
+				}
+			}, {}, {
+				sort: {
+					_id: -1
+				}
+			})
+			.toArray();
+
+		posts.map(post => {
+			post._highlight = response.hits.hits.filter(hit => post._id.equals(hit._id))[0].highlight.text[0];
+		});
+
+		// Serialize
+		res(await Promise.all(posts.map(async post =>
+			await serialize(post, me))));
+	});
+}