Add wiki audit logs (#52)

* Add wiki audit logs

* Flake8 issues

* Forgot to remove debug prints

* Removed print but forgot to remove `.text`

* Futile attempt to increase coverage

* Reading up on API docs asks us to send User-Agent with our info in it

* Add tests for wiki

* Well played, Travis

* Nothing in my local env is working on travis lol

* Why does it appear it can't decide between 200 & 302 :thinking:

* Flake8

* Post route

* Same issue with local env working differently from Travis env

* Add page to show page is being edited

* Lock page when it is being edited

* Add JS to keep refreshing lock on article

* Add compare route to render diff

* Add revision table to database

* Add revision storage

* Add revision list route

* JS for Revision list radio buttons

* Add revision comparison template

* Add revision list template

* flak8 my ass

* [Unit Tests] New unit tests for history routes :sparkles:

* Does this fix things?

* Address gdude's reviews

* Noticed a bug in the diff generation route which meant that empty posts could potentially error

* Flake 8

* Audit logs were logging after change, meaning it was comparing after & after, which didn't work

* Change table name

* Remove whitespace from line to fix flake8 issue

* Address reviews

* Git hook made me do something wrong, apologies

* Switch from werkzeug redirect to flask one

* Address Apertures reviews

4 files changed, 81 insertions, 1 deletions

diff --git a/templates/wiki/compare_revision.html b/templates/wiki/compare_revision.html
new file mode 100644
index 00000000..34ab61bc
--- /dev/null
+++ b/templates/wiki/compare_revision.html
@@ -0,0 +1,13 @@
+{% extends "wiki/base.html" %}
+{% block title %}Wiki | Comparing {{ title }}{% endblock %}
+{% block og_title %}Wiki | Comparing {{ title }}{% endblock %}
+{% block og_description %}{% endblock %}
+{% block content %}
+    <div class="uk-container uk-container-small">
+        <h2 class="uk-title">
+            Revision comparison for {{ title }}
+        </h2>
+
+        {{ diff | safe }}
+    </div>
+{% endblock %}
diff --git a/templates/wiki/page_edit.html b/templates/wiki/page_edit.html
index b59a8912..a2d709e2 100644
--- a/templates/wiki/page_edit.html
+++ b/templates/wiki/page_edit.html
@@ -99,5 +99,23 @@
         document.getElementById("title").oninput = function() {
             document.getElementById("preview-title").textContent = document.getElementById("title").value;
         }
+
+        function refreshLock(){
+            console.log("Refreshing lock")
+            let xhttp = new XMLHttpRequest();
+            xhttp.onreadystatechange = function() {
+                if (this.readyState === 4 && this.status === 204) {
+                    console.log("Lock refreshed")
+                } else if(this.readyState === 4 && this.status !== 204) {
+                    console.log("Could not refresh lock")
+                }
+            };
+
+            xhttp.open("PATCH", document.location.pathname, true);
+            xhttp.send();
+        }
+
+        // Lock refreshing
+        setInterval(refreshLock, (60 * 4) * 1000)
     </script>
-{% endblock %}
\ No newline at end of file
+{% endblock %}
diff --git a/templates/wiki/page_in_use.html b/templates/wiki/page_in_use.html
new file mode 100644
index 00000000..4110ee17
--- /dev/null
+++ b/templates/wiki/page_in_use.html
@@ -0,0 +1,13 @@
+{% extends "wiki/base.html" %}
+{% block title %}Wiki Error{% endblock %}
+{% block og_title %}Wiki Error{% endblock %}
+{% block og_description %}{% endblock %}
+{% block content %}
+    <div class="uk-container uk-container-small">
+        <div uk-alert class="uk-alert-warning">
+            <a class="uk-alert-close" uk-close></a>
+            <h3>The page you requested is currently being edited</h3>
+            <p>Please try again in a little bit when the lock has expired.</p>
+        </div>
+    </div>
+{% endblock %}
diff --git a/templates/wiki/revision_list.html b/templates/wiki/revision_list.html
new file mode 100644
index 00000000..6eb5b6a8
--- /dev/null
+++ b/templates/wiki/revision_list.html
@@ -0,0 +1,36 @@
+{% extends "wiki/base.html" %}
+{% block title %}Wiki | Revisions to {{ page }}{% endblock %}
+{% block og_title %}Wiki | Revisions to {{ page }}{% endblock %}
+{% block og_description %}{% endblock %}
+{% block content %}
+    <div class="uk-container">
+        <h2>Wiki page revisions</h2>
+        <table class="uk-table uk-table-hover">
+            <thead>
+            <tr>
+                <th>Page title</th>
+                <th>Date</th>
+                <th>User ID</th>
+                <th>Compare before</th>
+                <th>Compare after</th>
+            </tr>
+            </thead>
+            <tbody>
+            {% for revision in revisions %}
+                <tr>
+                    <td>{{ revision["post"]["title"] }}</td>
+                    <td>{{ revision["pretty_time"] }}</td>
+                    <td>{{ revision['user'] }}</td>
+                    <td><input type="radio" id="compare-before-{{ revision['id'] }}" class="uk-radio"></td>
+                    <td><input type="radio" id="compare-after-{{ revision['id'] }}" class="uk-radio"></td>
+                </tr>
+            {% endfor %}
+            </tbody>
+        </table>
+        <a href="#" id="compare-submit" class="uk-button uk-button-primary">Compare selections</a>
+    </div>
+    <script>
+        let revisions = {{ revisions | tojson }}
+    </script>
+    <script src="{{ static_file("js/revision_diff.js") }}"></script>
+{% endblock %}