[change] Metric collection: added consent logic to admin UI #372

* Added info message to admin UI (only once and only for super users)
* Added a consent form to openwisp-info page
* Changed app name from "openwisp_utils.measurements" to "openwisp_utils.metric_collection"
* Refactored code to reduce verbosity

Closes #372

---------

Co-authored-by: Federico Capoano <f.capoano@openwisp.io>

README.rst

@@ -1674,7 +1674,7 @@ Collection of Usage Metrics
 ---------------------------
 
 The ``openwisp-utils`` module includes an optional
-sub-app ``openwisp_utils.measurements``.
+sub-app ``openwisp_utils.metric_collection``.
 
 This sub-app allows us to collect of the following information
 from OpenWISP instances:
@@ -1706,8 +1706,9 @@ means to make data-driven decisions while respecting our users' rights and trust
 We have taken great care to ensure no
 sensitive or personal data is being tracked.
 
-The collection of this data can be disabled at any time by removing
-the ``openwisp_utils.measurements`` app from ``INSTALLED_APPS``.
+You can opt-out from sharing this data any time from the "System Info" page.
+Alternatively, you can also remove the ``openwisp_utils.metric_collection`` app
+from ``INSTALLED_APPS``.
 
 Quality Assurance Checks
 ------------------------

openwisp_utils/admin_theme/admin.py

@@ -5,9 +5,9 @@
 from django.shortcuts import render
 from django.urls import path
 from django.utils.module_loading import import_string
-from django.utils.translation import gettext_lazy
 from django.utils.translation import gettext_lazy as _
 
+from ..metric_collection.helper import MetricCollectionAdminSiteHelper
 from . import settings as app_settings
 from .dashboard import get_dashboard_context
 from .system_info import (
@@ -25,16 +25,18 @@ class OpenwispAdminSite(admin.AdminSite):
     # h1 text
     site_header = getattr(settings, 'OPENWISP_ADMIN_SITE_HEADER', 'OpenWISP')
     # text at the top of the admin index page
-    index_title = gettext_lazy(
+    index_title = _(
         getattr(settings, 'OPENWISP_ADMIN_INDEX_TITLE', 'Network Administration')
     )
     enable_nav_sidebar = False
+    metric_collection = MetricCollectionAdminSiteHelper
 
     def index(self, request, extra_context=None):
         if app_settings.ADMIN_DASHBOARD_ENABLED:
             context = get_dashboard_context(request)
         else:
             context = {'dashboard_enabled': False}
+        self.metric_collection.show_consent_info(request)
         return super().index(request, extra_context=context)
 
     def openwisp_info(self, request, *args, **kwargs):
@@ -45,6 +47,7 @@ def openwisp_info(self, request, *args, **kwargs):
             'title': _('System Information'),
             'site_title': self.site_title,
         }
+        self.metric_collection.manage_form(request, context)
         return render(request, 'admin/openwisp_info.html', context)
 
     def get_urls(self):

openwisp_utils/admin_theme/static/admin/css/openwisp-info.css

@@ -0,0 +1,10 @@
+#id_user_consented {
+    float: left;
+    margin-right: 8px;
+    vertical-align: top;
+    margin-bottom: 0px;
+}
+#id_metric_collection_consent_form > span.helptext{
+    display: block;
+    margin-top: 8px;
+}

openwisp_utils/admin_theme/static/admin/css/openwisp.css

@@ -123,6 +123,7 @@ a.section:link,
 a.section:visited,
 .module th a,
 #main .help a,
+#main .helptext a,
 fieldset.collapsed a.collapse-toggle,
 fieldset a.collapse-toggle {
   color: #df5d43;
@@ -137,7 +138,9 @@ a.section:link:focus,
 a.section:visited:focus,
 .module th a:focus,
 #main .help a:hover,
-#main .help a:focus {
+#main .help a:focus,
+#main .helptext a:focus,
+#main .helptext a:focus {
   text-decoration: underline;
 }
 #main-content .module caption a {
@@ -182,7 +185,9 @@ a:focus {
   display: inline-block;
 }
 #main .form-row .help,
-#container #main-content .help {
+#main .form-row .helptext,
+#container #main-content .help,
+#container #main-content .helptext {
   font-size: 14px !important;
   line-height: 20px;
   color: rgba(0, 0, 0, 0.45);

openwisp_utils/admin_theme/templates/admin/openwisp_info.html

@@ -1,5 +1,10 @@
 {% extends "admin/base_site.html" %}
-{% load i18n %}
+{% load i18n static %}
+
+{% block extrastyle %}
+{{ block.super }}
+<link rel="stylesheet" type="text/css" href="{% static 'admin/css/openwisp-info.css' %}" />
+{% endblock extrastyle %}
 
 {% block content %}
 {% if openwisp_version %}
@@ -15,4 +20,30 @@ <h2>{% trans "OS Information" %}</h2>
 <p><strong>{% trans "OS version" %}:</strong> {{ system_info.os_version }}</p>
 <p><strong>{% trans "Kernel version" %}:</strong> {{ system_info.kernel_version }}</p>
 <p><strong>{% trans "Hardware platform" %}:</strong> {{ system_info.hardware_platform }}</p>
+
+{% block metric_collect_consent %}
+    {% if metric_collection_installed %}
+        <h2>Metric collection</h2>
+        <form method="POST" id="id_metric_collection_consent_form">
+            {% csrf_token %}
+            {{ metric_consent_form }}
+            <p><input type="submit" style="display:none;"></p>
+        </form>
+    {% endif %}
+{% endblock metric_collect_consent %}
 {% endblock content %}
+
+{% block extrahead %}
+  {{ block.super }}
+  {% if 'jquery' not in block.super and not media.js %}
+    <script type="text/javascript" src="{% static 'admin/js/vendor/jquery/jquery.min.js' %}"></script>
+    <script type="text/javascript" src="{% static 'admin/js/jquery.init.js' %}"></script>
+  {% endif %}
+{% endblock %}
+
+{% block footer %}
+    {{ block.super }}
+    {% if metric_collection_installed %}
+        <script src="{% static 'admin/js/metric-collection-consent.js' %}"></script>
+    {% endif %}
+{% endblock footer %}

openwisp_utils/metric_collection/admin.py

@@ -0,0 +1,42 @@
+from django import forms
+from django.forms.utils import ErrorList
+
+from .models import Consent
+
+
+class ConsentForm(forms.ModelForm):
+    # This required to override the default label_suffix.
+    # Otherwise, it will show a trailing colon (:) which we
+    # don't want here due to formatting of the form.
+    def __init__(
+        self,
+        data=None,
+        files=None,
+        auto_id="id_%s",
+        prefix=None,
+        initial=None,
+        error_class=ErrorList,
+        label_suffix='',
+        empty_permitted=False,
+        instance=None,
+        use_required_attribute=None,
+        renderer=None,
+    ):
+        super().__init__(
+            data,
+            files,
+            auto_id,
+            prefix,
+            initial,
+            error_class,
+            label_suffix,
+            empty_permitted,
+            instance,
+            use_required_attribute,
+            renderer,
+        )
+
+    class Meta:
+        model = Consent
+        widgets = {'user_consented': forms.CheckboxInput(attrs={'class': 'bold'})}
+        fields = ['user_consented']