Add example app for Sinatra sanitized routes (#124)

* Add example app for Sinatra sanitized routes

Add test route to Sinatra app to test the sanitized routes / route
definition to be set as the `path` metadata to avoid storing PII and
other sensitive data.

Related PR appsignal/appsignal-ruby#972

* Update config option to filter_metadata

Added in PR appsignal/appsignal-ruby#973 in
favor of the `sinatra_sanitized_routes` option.

ruby/sinatra/app/Gemfile.lock

@@ -0,0 +1,111 @@
+PATH
+  remote: /integration
+  specs:
+    appsignal (3.4.4)
+      rack
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actionmailer (5.2.0)
+      actionpack (= 5.2.0)
+      actionview (= 5.2.0)
+      activejob (= 5.2.0)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (5.2.0)
+      actionview (= 5.2.0)
+      activesupport (= 5.2.0)
+      rack (~> 2.0)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    actionview (5.2.0)
+      activesupport (= 5.2.0)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activejob (5.2.0)
+      activesupport (= 5.2.0)
+      globalid (>= 0.3.6)
+    activesupport (5.2.0)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    builder (3.2.4)
+    coderay (1.1.3)
+    concurrent-ruby (1.2.2)
+    crass (1.0.6)
+    date (3.3.3)
+    erubi (1.12.0)
+    globalid (1.1.0)
+      activesupport (>= 5.0)
+    i18n (1.14.1)
+      concurrent-ruby (~> 1.0)
+    loofah (2.21.3)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
+    mail (2.8.1)
+      mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
+    method_source (1.0.0)
+    mini_mime (1.1.2)
+    minitest (5.18.1)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
+    net-imap (0.3.6)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.1)
+      timeout
+    net-smtp (0.3.3)
+      net-protocol
+    nokogiri (1.15.2-aarch64-linux)
+      racc (~> 1.4)
+    pry (0.14.2)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
+    racc (1.7.1)
+    rack (2.2.7)
+    rack-protection (3.0.6)
+      rack
+    rack-test (2.1.0)
+      rack (>= 1.3)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.6.0)
+      loofah (~> 2.21)
+      nokogiri (~> 1.14)
+    ruby2_keywords (0.0.5)
+    sinatra (3.0.6)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.6)
+      tilt (~> 2.0)
+    thread_safe (0.3.6)
+    tilt (2.2.0)
+    timeout (0.4.0)
+    tzinfo (1.2.11)
+      thread_safe (~> 0.1)
+    webrick (1.8.1)
+
+PLATFORMS
+  aarch64-linux
+
+DEPENDENCIES
+  actionmailer (= 5.2.0)
+  activesupport (= 5.2.0)
+  appsignal!
+  pry
+  sinatra
+  webrick
+
+BUNDLED WITH
+   2.2.33

ruby/sinatra/app/app.rb

@@ -12,6 +12,7 @@
     <ul>
       <li><a href="/slow?time=#{time}">Slow request</a></li>
       <li><a href="/error?time=#{time}">Error request</a></li>
+      <li><a href="/item/123?time=#{time}">Route with param request</a></li>
     </ul>
   HTML
 end
@@ -26,3 +27,7 @@
   Appsignal.add_breadcrumb("category", "action", "message", { "metadata_key" => "some value" })
   raise "error"
 end
+
+get "/item/:id" do
+  "Item with id #{params[:id]}"
+end

ruby/sinatra/app/config/appsignal.yml

@@ -1,4 +1,5 @@
 default: &defaults
+  filter_metadata: ["path"]
 
 test:
   <<: *defaults