Display Terraform states

Add an index route, and a route to access a historical Terraform state
by index.

This also makes the ordering explicit, and fixes an issue with wrapped
parameters.

4 files changed, 240 insertions, 5 deletions

diff --git a/app/controllers/terraform_http_backend_controller.rb b/app/controllers/terraform_http_backend_controller.rb
index e4d8c54..4d11961 100644
--- a/app/controllers/terraform_http_backend_controller.rb
+++ b/app/controllers/terraform_http_backend_controller.rb
@@ -21,24 +21,47 @@
 class TerraformHttpBackendController < ApplicationController
   skip_before_action :verify_authenticity_token
 
+  def index
+    @all_states = TerraformState.all.group_by(&:state_id)
+  end
+
   def create
     TerraformState.create(
       state_id: state_id,
-      data: params
+      data: params[:terraform_http_backend]
     )
 
     render json: '{ "success": true }', status: 200
   end
 
   def show
-    state = TerraformState.where(
+    @state = TerraformState.where(
       state_id: state_id
-    ).last
+    ).order(:id).last
 
-    if state.nil?
+    if @state.nil?
       render json: '{}', status: 404
     else
-      render json: state.data, status: 200
+      render json: @state.data, status: 200
+    end
+  end
+
+  def show_by_index
+    @state = TerraformState.where(
+      state_id: state_id
+    ).order(:id).to_a[params[:index].to_i]
+
+    respond_to do |format|
+      format.html do
+        render :show
+      end
+      format.json do
+        if @state.nil?
+          render json: '{}', status: 404
+        else
+          render json: @state.data, status: 200
+        end
+      end
     end
   end
 
diff --git a/app/views/terraform_http_backend/index.html.erb b/app/views/terraform_http_backend/index.html.erb
new file mode 100644
index 0000000..b2e2f92
--- /dev/null
+++ b/app/views/terraform_http_backend/index.html.erb
@@ -0,0 +1,53 @@
+<%#
+
+GOV.UK Mini Environment Admin
+Copyright © 2018  Christopher Baines <mail@cbaines.net>
+
+This file is part of the GOV.UK Mini Environment Admin.
+
+The GOV.UK Mini Environment Admin is free software: you can
+redistribute it and/or modify it under the terms of the GNU Affero
+General Public License as published by the Free Software Foundation,
+either version 3 of the License, or (at your option) any later
+version.
+
+The GOV.UK Mini Environment Admin is distributed in the hope that it
+will be useful, but WITHOUT ANY WARRANTY; without even the implied
+warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+the GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public
+License along with the GOV.UK Mini Environment Admin.  If not, see
+<http://www.gnu.org/licenses/>.
+
+%>
+
+<h1>Terraform States</h1>
+
+<table class="table">
+  <thead>
+    <tr>
+      <th>State ID</th>
+      <th>Count</th>
+    </tr>
+  </thead>
+  <tbody>
+    <% @all_states.each do |(state_id, states)| %>
+      <tr>
+        <td style="font-family: monospace;">
+          <a href="<%= terraform_http_backend_show_by_index_path(
+                   state_id,
+                   states.count - 1
+                   )
+                   %>">
+
+            <%= state_id %>
+          </a>
+        </td>
+        <td>
+          <%= states.count %>
+        </td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>
diff --git a/app/views/terraform_http_backend/show.html.erb b/app/views/terraform_http_backend/show.html.erb
new file mode 100644
index 0000000..e167541
--- /dev/null
+++ b/app/views/terraform_http_backend/show.html.erb
@@ -0,0 +1,148 @@
+<%#
+
+GOV.UK Mini Environment Admin
+Copyright © 2018  Christopher Baines <mail@cbaines.net>
+
+This file is part of the GOV.UK Mini Environment Admin.
+
+The GOV.UK Mini Environment Admin is free software: you can
+redistribute it and/or modify it under the terms of the GNU Affero
+General Public License as published by the Free Software Foundation,
+either version 3 of the License, or (at your option) any later
+version.
+
+The GOV.UK Mini Environment Admin is distributed in the hope that it
+will be useful, but WITHOUT ANY WARRANTY; without even the implied
+warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+the GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public
+License along with the GOV.UK Mini Environment Admin.  If not, see
+<http://www.gnu.org/licenses/>.
+
+%>
+
+<a class="pull-right" href="<%= terraform_states_path %>">
+  View all terraform states
+</a>
+
+<div class="row">
+  <div class="col-md-8">
+    <h1>
+      Terraform state:
+      <span style="font-family: monospace;">
+        <%= @state.state_id %>
+      </span>
+    </h1>
+
+    <br>
+    <table class="table">
+      <tbody>
+        <tr>
+          <td>Created at</td>
+          <td><%= @state.created_at %></td>
+        </tr>
+        <tr>
+          <td>Terraform version</td>
+          <td><%= @state.data['terraform_version'] %></td>
+        </tr>
+      </tbody>
+    </table>
+
+  </div>
+
+  <div class="col-md-4" style="max-height: 400px; overflow-y: auto;">
+    <% historical_states = TerraformState
+                             .where(state_id: @state.state_id)
+                             .order(:id)
+                             .to_a
+    %>
+
+    <h3>History (<%= pluralize(historical_states.count, 'states') %>)</h3>
+
+    <table class="table">
+      <thead>
+        <tr>
+          <th>#</th>
+          <th>Created at</th>
+          <th></th>
+        </tr>
+      </thead>
+      <tbody>
+
+        <% historical_states.each_with_index do |historical_state, index| %>
+          <% current = (@state.id == historical_state.id) %>
+
+          <tr>
+            <td>
+              <%= index %>
+              <% if current %>
+                <strong>(current)</strong>
+              <% end %>
+            </td>
+            <td>
+              <%= historical_state.created_at %>
+            </td>
+            <td>
+              <% unless current %>
+                <a href="<%= terraform_http_backend_show_by_index_path(
+                         historical_state.state_id,
+                         index
+                         )
+                         %>">
+                  View
+                </a>
+              <% end %>
+            </td>
+          </tr>
+        <% end %>
+      </tbody>
+    </table>
+  </div>
+</div>
+
+<h2>Modules</h2>
+
+<% @state.data.fetch('modules', []).each do |module_data| %>
+
+  <h3>Path: <%= module_data['path'] %></h3>
+
+  <h3>Outputs</h3>
+  <table class="table">
+  <% module_data['outputs'].each do |(key, output)| %>
+    <tr>
+      <td><%= key %></td>
+      <td><%= output['value'] %></td>
+    </tr>
+  <% end %>
+  </table>
+
+  <h3>Resources</h3>
+  <table class="table">
+    <% module_data['resources'].each do |(name, resource)| %>
+    <tr>
+      <td><%= name.gsub('.', '.<wbr/>').html_safe %></td>
+      <td>
+        <table class="table" style="table-layout: fixed;">
+          <thead>
+            <tr>
+              <th>Key</th>
+              <th>Value</th>
+            </tr>
+          </thead>
+          <tbody>
+            <% resource['primary']['attributes'].each do |(name, value)| %>
+              <tr>
+                <td class="col-md-6"><strong><%= name %></strong></td>
+                <td class="col-md-6"
+                    style="white-space: pre-wrap; overflow-wrap: break-word; word-break: break-all;"
+                ><%= value %></td>
+              </tr>
+            <% end %>
+          </tbody>
+        </table>
+      </td>
+    </tr>
+  <% end %>
+  </table>
+<% end %>
diff --git a/config/routes.rb b/config/routes.rb
index f6ea63b..3c303bc 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -32,8 +32,19 @@ Rails.application.routes.draw do
     end
   end
 
+  get(
+    'terraform_states',
+    to: 'terraform_http_backend#index',
+    as: 'terraform_states'
+  )
   scope :terraform_http_backend do
     get(
+      '*state_id/history/*index',
+      to: 'terraform_http_backend#show_by_index',
+      as: 'terraform_http_backend_show_by_index'
+    )
+
+    get(
       '*state_id',
       to: 'terraform_http_backend#show',
       format: false,