Try to prevent search queries from crashing

routes/search.js

@@ -9,6 +9,22 @@ const db = ds.db()
 
 const PER_PAGE = 100
 
+/**
+ * Wrap search queries that might crash FTS5 with double quotes.
+ * @param {String} q - search query
+ * @returns {String} a search query that probably won't crash SQLite's FTS5
+ */
+function safeQuery(q) {
+  let q2 = q.trim()
+  if (q2.match(/[-./]/)) {
+    q2 = `"${q2}"`
+  }
+  if (q2.match(/\+/)) {
+    q2 = q2.replace(/\+/g, ' ')
+  }
+  return q2
+}
+
 module.exports.GET = async (req, res) => {
   const url   = urlite.parse(req.url)
   const q = unescape(url.search.q)
@@ -22,8 +38,9 @@ module.exports.GET = async (req, res) => {
     // Search, if we have a query.
     const path = `/search?q=${url.search.q}&`
     const {limit, offset} = pagination.getValuesToPaginate({ currentPage: p, perPage: PER_PAGE })
-    const results = await ds.search(db, q, limit, offset)
-    const count = await ds.searchCount(db, q)
+    const q2 = safeQuery(q)
+    const results = await ds.search(db, q2, limit, offset)
+    const count = await ds.searchCount(db, q2)
     const totalPages = pagination.getTotalPages({ totalItems: count, perPage: PER_PAGE })
     const out = await page.render('search', { path, q, p, results, count, totalPages })
     return send(res, 200, out)