add dockerfile for isbn search

isbn-search/Dockerfile

@@ -0,0 +1,11 @@
+from ruby:3.0.2
+
+RUN mkdir /var/app
+
+WORKDIR /var/app
+
+COPY . .
+
+RUN bundle install
+
+CMD ["sh", "bin/http"]

isbn-search/Gemfile

@@ -1,4 +1,6 @@
 source 'https://rubygems.org'
 gem 'sinatra'
 gem 'rack', '~> 2.0.1'
-gem 'thin'
+gem 'thin'
+
+gem 'byebug'

isbn-search/Gemfile.lock

@@ -1,6 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    byebug (11.1.3)
     daemons (1.4.1)
     eventmachine (1.2.7)
     mustermann (1.1.1)
@@ -24,6 +25,7 @@ PLATFORMS
   arm64-darwin-20
 
 DEPENDENCIES
+  byebug
   rack (~> 2.0.1)
   sinatra
   thin

isbn-search/app.rb

@@ -1,6 +1,34 @@
 # app.rb
 require 'sinatra'
+require 'json'
+
+ISBNS = {
+  '2-7654-1005-4': {
+    title: 'Lucy',
+    author: 'Renard',
+    description: 'A book about stars.'
+  },
+  '2-7754-1105-4': {
+    title: 'Mountains',
+    author: 'John Smith',
+    description: 'A book about plains.'
+  },
+}
 
 get '/' do
   'Hello world!'
 end
+
+get '/isbn/:isbn' do
+  isbn = params[:isbn].to_sym
+
+  if ISBNS.keys.include?(isbn)
+    response = ISBNS[isbn].to_json
+    status 200
+    body response
+  else
+    response = { error: 'Not found' }.to_json
+    status 404
+    body response
+  end
+end