added the min-search-term-length site setting

app/assets/javascripts/discourse/views/search/search_view.js

@@ -36,9 +36,10 @@ Discourse.SearchView = Discourse.View.extend({
   // If we need to perform another search
   newSearchNeeded: (function() {
     this.set('noResults', false);
-    if (this.present('term')) {
+    var term = this.get('term');
+    if (term && term.length >= Discourse.SiteSettings.min_search_term_length) {
       this.set('loading', true);
-      this.searchTerm(this.get('term'), this.get('typeFilter'));
+      this.searchTerm(term, this.get('typeFilter'));
     } else {
       this.set('results', null);
     }

app/controllers/search_controller.rb

@@ -3,7 +3,8 @@ require_dependency 'search'
 class SearchController < ApplicationController
 
   def query
-    render_json_dump(Search.query(params[:term], params[:type_filter]).as_json)
+    search_result = Search.query(params[:term], params[:type_filter], SiteSetting.min_search_term_length)
+    render_json_dump(search_result.as_json)
   end
 
 end

app/models/site_setting.rb

@@ -29,6 +29,7 @@ class SiteSetting < ActiveRecord::Base
   client_setting(:max_post_length, 16000)
   client_setting(:min_topic_title_length, 5)
   client_setting(:max_topic_title_length, 255)
+  client_setting(:min_search_term_length, 3)
   client_setting(:flush_timings_secs, 5)
   client_setting(:supress_reply_directly_below, true)
   client_setting(:email_domains_blacklist, 'mailinator.com')

config/locales/server.en.yml

@@ -254,6 +254,7 @@ en:
     max_post_length: "Maximum post length in characters"
     min_topic_title_length: "Minimum topic title length in characters"
     max_topic_title_length: "Maximum topic title length in characters"
+    min_search_term_length: "Minimum search term length in characters"
     allow_duplicate_topic_titles: "Allow topics with identical titles"
     unique_posts_mins: "How many minutes before a user can make a post with the same content again"
     enforce_global_nicknames: "Enforce global nickname uniqueness (WARNING: only change this during initial setup)"

config/locales/server.fr.yml

@@ -261,6 +261,7 @@ fr:
     max_post_length: "longueur maximale des messages"
     min_topic_title_length: "longueur minimale des titres de discussion"
     max_topic_title_length: "longueur maximale des titres de discussion"
+    min_search_term_length: "longueur mimimale du texte saisie avant de lancer une recherche"
     allow_duplicate_topic_titles: "deux utilisateurs peuvent-ils créer des discussions avec le même titre"
     unique_posts_mins: "Combien de temps avant qu'un utilisateur puisse poster le même contenu à nouveau"
     enforce_global_nicknames: "Imposer un pseudo global. Note: fonctionne uniquement pendant la phase initiale de paramétrage."

lib/search.rb

@@ -1,9 +1,5 @@
 module Search
 
-  def self.min_search_term_length
-    3
-  end
-
   def self.per_facet
     5
   end
@@ -97,15 +93,15 @@ module Search
     end
   end
 
-  def self.query(term, type_filter=nil)
+  def self.query(term, type_filter=nil, min_search_term_length=3)
 
     return nil if term.blank?
-    sanitized_term = PG::Connection.escape_string(term.gsub(/[:()&!]/,'')) # Instead of original term.gsub(/[^0-9a-zA-Z_ ]/, '')
 
     # We are stripping only symbols taking place in FTS and simply sanitizing the rest.
+    sanitized_term = PG::Connection.escape_string(term.gsub(/[:()&!]/,'')) 
 
     # really short terms are totally pointless
-    return nil if sanitized_term.blank? || sanitized_term.length < self.min_search_term_length
+    return nil if sanitized_term.blank? || sanitized_term.length < min_search_term_length
 
     terms = sanitized_term.split
     terms.map! {|t| "#{t}:*"}
@@ -176,12 +172,14 @@ module Search
     result = grouped.map do |type, results|
       more = type_filter.blank? && (results.size > Search.per_facet)
       results = results[0..([results.length, Search.per_facet].min - 1)] if type_filter.blank?
-
-      {type: type,
-       name: I18n.t("search.types.#{type}"),
-       more: more,
-       results: results}
+      {
+        type: type,
+        name: I18n.t("search.types.#{type}"),
+        more: more,
+        results: results
+      }
     end
+
     result
   end
 

spec/components/search_spec.rb

@@ -71,6 +71,11 @@ describe Search do
     Search.query(nil).should be_blank
   end
 
+  it 'does not search when the search term is too small' do
+    ActiveRecord::Base.expects(:exec_sql).never
+    Search.query('evil', nil, 5).should be_blank
+  end
+
   it 'escapes non alphanumeric characters' do
     Search.query('foo :!$);}]>@\#\"\'').should be_blank # There are at least three levels of sanitation for Search.query!
   end

spec/controllers/search_controller_spec.rb

@@ -3,14 +3,13 @@ require 'spec_helper'
 describe SearchController do
 
   it 'performs the query' do
-    Search.expects(:query).with('test', nil)
+    Search.expects(:query).with('test', nil, 3)
     xhr :get, :query, term: 'test'
   end
 
   it 'performs the query with a filter' do
-    Search.expects(:query).with('test', 'topic')
+    Search.expects(:query).with('test', 'topic', 3)
     xhr :get, :query, term: 'test', type_filter: 'topic'
   end
 
-
 end