allow users to create bills

app/assets/javascripts/bills.js

+//= require qrbill.js

app/controllers/bills_controller.rb

+class BillsController < ApplicationController
+  include ApiBackend
+
+  def to_creditor_reference(key)
+    str = ""
+    key.split("").each do |d|
+      d = d.downcase.chr
+      if d >= '0' && d <= '9'
+        str << d
+      elsif d >= 'a' && d <= 'z'
+        str << (d.bytes.first-'a'.bytes.first+10).to_s
+      else
+        throw d
+        throw :invalid_char
+      end
+    end
+    str2 = "#{str}2715"
+    rem = str2.to_i % 97
+    diff = (rem-1) % 97
+    "RF#{'%02d' % diff}#{key}"
+  end
+
+  def show
+    begin
+      @year = (params[:year] || DateTime.now.year).to_i
+      res = api.get_user_transactions('bill', ["#{@year}-01-01", "#{@year+1}-01-01"])
+      res.each do |r|
+        paid = api.get_global_transaction('bill', r.first[:reference])
+        if paid
+          r.first[:paid] = paid
+        end
+        r.first[:reference] = to_creditor_reference(r.first[:reference])
+      end
+    rescue ApiBackend::ApiError
+      flash[:danger] = :failed
+      redirect_to root_path
+      return
+    end
+    @bills = res
+  end
+
+  def create
+    ttl = 6*365
+    amount = params[:amount].to_f
+    reference = api.get_fresh_global_transaction_key('bill', 20, ttl)
+    reference = reference['key']
+    if reference.length == 20
+      api.add_user_transaction('bill',
+          {reference: reference, amount: amount, currency: 'CHF'}, ttl)
+    end
+    redirect_to action: :show
+  rescue ApiError => e
+    flash[:danger] = e.api_msg
+    redirect_to bills_path
+  end
+end

app/controllers/concerns/api_backend.rb

@@ -399,6 +399,35 @@ module ApiBackend
     def release_reserved_identifier(kind, id)
       post(['users_admin', 'release_reserved_identifier'], {release: {kind => id}})
     end
+
+    def get_user_transactions(scope, timeframe = nil)
+      res = if timeframe
+        get(['user_transaction', 'get'], {scope: scope, from: timeframe.first, to: timeframe.second})
+      else
+        get(['user_transaction', 'get'], {scope: scope})
+      end
+      res['values'].map{|e| [YAML.load(e.first), DateTime.parse(e.second)] }
+    end
+
+    def add_user_transaction(scope, value, ttl)
+      post(['user_transaction', 'add'], {scope: scope, value: value.to_yaml, ttl: ttl})
+    end
+
+    def get_global_transaction(scope, key)
+      res = get(['global_transaction', 'get'], {scope: scope, key: key})
+      if res['notfound']
+        return nil
+      end
+      YAML.load(res['value'])
+    end
+
+    def get_fresh_global_transaction_key(scope, length, ttl)
+      post(['global_transaction', 'get_fresh_key'], {scope: scope, lenght: length, ttl: ttl})
+    end
+
+    def add_global_transaction(scope, key, value, ttl)
+      post(['global_transaction', 'add'], {scope: scope, key: key, value: value.to_yaml, ttl: ttl})
+    end
   end
 
   def api

app/views/application/_menu.html.erb

@@ -18,6 +18,7 @@
     mail_crypt:          {nudge: !mail_crypt_enabled?},
     app_passwords:       {},
     pgpkeys:             {},
+    bills:               ({}                          if feature_toggle?('bills')),
     invites:             ({}                          if allow_invites?),
     delete_account:      {},
     services:            ({divider: true}             if (any_resource_enabled? || any_resource_exists?)),

app/views/bills/show.html.erb

+<%= form_tag do %>
+  <div class="form-group">
+    <%= label_tag "CHF" %>
+    <%= text_field_tag('amount', "", class: 'form-control') %>
+  </div>
+
+  <%= submit_tag t(:create), name: 'create', class: "btn btn-primary" %>
+<% end %>
+
+<hr />
+
+<%= form_tag "", method: :get do %>
+  <div class="form-group">
+    <%= select_tag(:year,
+                   options_for_select([['----',nil]]+(0..5).map{|d| DateTime.now.year - d },
+                                      @year || '----'),
+                   onchange: 'submit()') %>
+  </div>
+<% end %>
+
+<% id = 0; sum = {} %>
+<% for e in @bills %>
+  <% bill, date = e
+     id = id+1
+     if bill[:paid]
+       p = bill[:paid]
+       sum[p[:currency]] ||= 0.0
+       sum[p[:currency]] += (p[:amount] || 0)
+     end %>
+  <%= "#{date.day}.#{date.month}.#{date.year}" %>:
+  <%= bill[:currency] %>
+  <% if bill[:amount] > 0.0 %>
+    <%= bill[:amount] %>
+  <% end %>
+  <% if bill[:paid] %>
+    <b><%= bill[:paid][:status] %></b>
+    <% if bill[:paid][:amount] != bill[:amount] ||
+        bill[:paid][:currency] != bill[:currency] %>
+      (<%= bill[:paid][:currency] %> <%= bill[:paid][:amount] %>)
+    <% end %>
+  <% end %>
+  <a href="#" onclick="this.style.display = 'none'; qrbill.createQRBill(
+            '<%= bill[:currency].upcase %>',
+            <%= if bill[:amount] > 0.0 then bill[:amount] else 'undefined' end %>,
+            '<%= bill[:reference] %>',
+            function(url){
+              var f = document.getElementById('bill-<%= id %>');
+              f.src = url;
+              f.style.display = 'block';
+            });" />
+            show</a> <br />
+  <iframe id="bill-<%= id %>" style="width:100%; height: 450px; display: none;">
+  </iframe>
+<% end %>
+
+<% unless sum.empty? %>
+  <hr />
+  Thank you very much for donating a total of <%= sum.to_a.map{|e| e.join(" ")}.join(", ") %>
+    to immerda in the year <%= @year %>.
+<% end %>

config/routes.rb

@@ -69,6 +69,9 @@ Rails.application.routes.draw do
     post  '/resources/:kind',      to: 'resources#update'
     get   '/new_resource',         to: 'resources#create'
     post  '/new_resource',         to: 'resources#do_create'
+
+    get   '/bills', to: 'bills#show'
+    post  '/bills', to: 'bills#create'
   else
 
     root to: 'admin#index'