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<h1>Test QR SVG Django</h1>
<p>date: 2021-04-19</p>
<h2 id="introduction"><strong>Introduction</strong></h2>
<p>I worked out a solution in django-testing, for testing a view that renders a qrcode
as an svg as an inline svg xml string.</p>
<p>In case you are not familiar with
<a href="https://en.wikipedia.org/wiki/Scalable_Vector_Graphics" target="_blank">svg</a>,
scalable vector graphics, it is an image that is
completely rendered from a
<a href="https://en.wikipedia.org/wiki/String_(computer_science)" target="_blank">string</a>
of text, or more accurately <a href="https://en.wikipedia.org/wiki/XML" target="_blank">XML</a>
text, unlike <a href="https://en.wikipedia.org/wiki/Portable_Network_Graphics" target="_blank">PNG</a>
or <a href="https://en.wikipedia.org/wiki/JPEG" target="_blank">JPG</a>, which are
<a href="https://en.wikipedia.org/wiki/Binary_file" target="_blank">binary file</a>s.</p>
<h3 id="python-libraries-used">Python Libraries Used</h3>
<ul>
<li><a href="https://pypi.org/project/beautifulsoup4/" target="_blank">BeautifulSoup</a>
to consume html</li>
<li><a href="https://pypi.org/project/CairoSVG/" target="_blank">CairoSVG</a>
to convert svg to png</li>
<li><a href="https://pypi.org/project/Pillow/" target="_blank">python-pillow</a>
to convert transparent png background to white</li>
<li><a href="https://pypi.org/project/opencv-python/" target="_blank">opencv-python</a>
to extract data from qrcode</li>
<li><a href="https://pypi.org/project/pyotp/" target="_blank">python-pyotp</a></li>
</ul>
<h2 id="form-screenshot"><strong>Form ScreenShot</strong></h2>
<p>This is the form we will be testing.</p>
<p>In real life you would confirm that you want to use
<a href="https://en.wikipedia.org/wiki/Multi-factor_authentication" target="_blank">two-factor-authentication</a>
by scanning the qrcode with an
<a href="https://play.google.com/store/apps/details?id=org.shadowice.flocke.andotp" target="_blank">authentication app</a>
on your smartphone, and then enter the
<a href="https://en.wikipedia.org/wiki/Time-based_One-Time_Password" target="_blank">time-based one-time password</a>.</p>
<p>totp codes are derived from two things and two things only. A secret key and a time such as the current time.
For instance, an authentication application can tell you what your totp code is, but of course
in this testing scenario we use
<a href="https://pypi.org/project/pyotp/" target="_blank">python-pyotp</a>, after extracting
the secret key from the qrcode.</p>
<div align="center">
<em>enable totp confirmation form</em>
</div>
<p><img alt="&quot;ScreenShot of a confirmation form for enabling totp (in a django app)&quot;" class="center" src="../../photos/IMG_screenshot_enable_totp_confirmation_form.jpg" /></p>
<h2 id="import-python-libraries"><strong>Import Python Libraries</strong></h2>
<div class="highlight"><pre><span></span><code><span class="c1"># tp/accounts/tests/test_enable_totp_view.py</span>
<span class="c1"># python manage.py test accounts.tests.test_enable_totp_view</span>
<span class="kn">from</span> <span class="nn">django.test</span> <span class="kn">import</span> <span class="n">TestCase</span>
<span class="kn">from</span> <span class="nn">django.contrib.auth.models</span> <span class="kn">import</span> <span class="n">User</span>
<span class="kn">from</span> <span class="nn">accounts.models</span> <span class="kn">import</span> <span class="n">Account</span>
<span class="kn">from</span> <span class="nn">django.urls</span> <span class="kn">import</span> <span class="n">reverse</span>
<span class="kn">from</span> <span class="nn">bs4</span> <span class="kn">import</span> <span class="n">BeautifulSoup</span>
<span class="kn">import</span> <span class="nn">cv2</span>
<span class="kn">from</span> <span class="nn">cairosvg</span> <span class="kn">import</span> <span class="n">svg2png</span>
<span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">Image</span>
<span class="kn">import</span> <span class="nn">pyotp</span>
<span class="kn">import</span> <span class="nn">pathlib</span>
</code></pre></div>
<p>The Account model has a one-to-one relationship with the Django built-in
User model. This is where we keep track of the totp secret key and
boolean value for having totp authentication enabled.</p>
<h2 id="setup-testcase"><strong>setUp TestCase</strong></h2>
<div class="highlight"><pre><span></span><code><span class="o">...</span>
<span class="kn">import</span> <span class="nn">pathlib</span>
<span class="k">class</span> <span class="nc">TestEnableTOTPViewTestCase</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">setUp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">user_a</span> <span class="o">=</span> <span class="n">User</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">create</span><span class="p">(</span>
<span class="n">username</span><span class="o">=</span><span class="s1">&#39;user_a&#39;</span><span class="p">)</span>
<span class="n">user_a</span><span class="o">.</span><span class="n">set_password</span><span class="p">(</span><span class="s1">&#39;password_user_a&#39;</span><span class="p">)</span>
<span class="n">user_a</span><span class="o">.</span><span class="n">save</span><span class="p">()</span>
<span class="n">Account</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">user</span><span class="o">=</span><span class="n">user_a</span><span class="p">)</span>
</code></pre></div>
<p>We create a test user and save that in the test database.</p>
<h2 id="get-form"><strong>GET Form</strong></h2>
<p><div class="highlight"><pre><span></span><code><span class="k">class</span> <span class="nc">TestEnableTOTPViewTestCase</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="o">...</span>
<span class="k">def</span> <span class="nf">test_enable_totp_view</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">login</span><span class="p">(</span>
<span class="n">username</span><span class="o">=</span><span class="s1">&#39;user_a&#39;</span><span class="p">,</span>
<span class="n">password</span><span class="o">=</span><span class="s1">&#39;password_user_a&#39;</span>
<span class="p">)</span>
<span class="n">get_response</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">get</span><span class="p">(</span>
<span class="n">reverse</span><span class="p">(</span><span class="s1">&#39;accounts:enable_totp&#39;</span><span class="p">)</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="n">get_response</span><span class="o">.</span><span class="n">status_code</span><span class="p">,</span> <span class="mi">200</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertTemplateUsed</span><span class="p">(</span>
<span class="n">get_response</span><span class="p">,</span> <span class="s1">&#39;accounts/totp_form.html&#39;</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="n">get_response</span><span class="o">.</span><span class="n">request</span><span class="p">[</span><span class="s1">&#39;PATH_INFO&#39;</span><span class="p">],</span>
<span class="s1">&#39;/accounts/enable-totp/&#39;</span>
<span class="p">)</span>
</code></pre></div>
The TestCase requires two requests. In the first request we GET the form
so that we can consume the qrcode.</p>
<h2 id="consume-svg-with-beautifulsoup"><strong>Consume SVG with BeautifulSoup</strong></h2>
<p><div class="highlight"><pre><span></span><code><span class="k">class</span> <span class="nc">TestEnableTOTPViewTestCase</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="o">...</span>
<span class="k">def</span> <span class="nf">test_enable_totp_view</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="o">...</span>
<span class="n">soup</span> <span class="o">=</span> <span class="n">BeautifulSoup</span><span class="p">(</span>
<span class="n">get_response</span><span class="o">.</span><span class="n">content</span><span class="p">,</span> <span class="n">features</span><span class="o">=</span><span class="s2">&quot;lxml&quot;</span>
<span class="p">)</span>
<span class="n">svg_container</span> <span class="o">=</span> <span class="n">soup</span><span class="o">.</span><span class="n">find</span><span class="p">(</span>
<span class="s2">&quot;div&quot;</span><span class="p">,</span> <span class="p">{</span><span class="s2">&quot;id&quot;</span><span class="p">:</span> <span class="s2">&quot;svgcontainer&quot;</span><span class="p">}</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertIsNotNone</span><span class="p">(</span><span class="n">svg_container</span><span class="p">)</span>
<span class="n">scsvg</span> <span class="o">=</span> <span class="n">svg_container</span><span class="o">.</span><span class="n">findChild</span><span class="p">(</span>
<span class="s2">&quot;svg&quot;</span><span class="p">,</span> <span class="n">recursive</span><span class="o">=</span><span class="kc">False</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertIsNotNone</span><span class="p">(</span><span class="n">scsvg</span><span class="p">)</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s1">&#39;qr.svg&#39;</span><span class="p">,</span> <span class="s1">&#39;w&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">x_string</span> <span class="o">=</span> <span class="s2">&quot;&lt;?xml version=&#39;1.0&#39;&quot;</span>
<span class="n">x_string</span> <span class="o">+=</span> <span class="s2">&quot; encoding=&#39;utf-8&#39;?&gt;</span><span class="se">\n</span><span class="s2">&quot;</span>
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">x_string</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">scsvg</span><span class="p">))</span>
</code></pre></div>
The inline xml for the svg comes to us as a child of a
<code>div</code> with an <code>id</code> of <em>svgcontainer</em>. We capture the xml of the svg in the variable
<code>scsvg</code>, and then write it out to disc.</p>
<h2 id="svg2png"><strong>svg2png</strong></h2>
<p><div class="highlight"><pre><span></span><code><span class="k">class</span> <span class="nc">TestEnableTOTPViewTestCase</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="o">...</span>
<span class="k">def</span> <span class="nf">test_enable_totp_view</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="o">...</span>
<span class="n">svg2png</span><span class="p">(</span>
<span class="n">url</span><span class="o">=</span><span class="s1">&#39;qr.svg&#39;</span><span class="p">,</span> <span class="n">write_to</span><span class="o">=</span><span class="s1">&#39;qr.png&#39;</span><span class="p">,</span>
<span class="n">scale</span><span class="o">=</span><span class="mi">8</span>
<span class="p">)</span>
</code></pre></div>
With svg2png from CairoSVG, we convert the svg to png format. Opencv seems
unable to consume the qrcode unless you scale it up.</p>
<h2 id="add-white-background"><strong>Add White Background</strong></h2>
<p><div class="highlight"><pre><span></span><code><span class="k">class</span> <span class="nc">TestEnableTOTPViewTestCase</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="o">...</span>
<span class="k">def</span> <span class="nf">test_enable_totp_view</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="o">...</span>
<span class="n">t_image</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s1">&#39;qr.png&#39;</span><span class="p">)</span>
<span class="n">t_image</span><span class="o">.</span><span class="n">load</span><span class="p">()</span>
<span class="n">background</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">new</span><span class="p">(</span>
<span class="s2">&quot;RGB&quot;</span><span class="p">,</span> <span class="n">t_image</span><span class="o">.</span><span class="n">size</span><span class="p">,</span>
<span class="p">(</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">)</span>
<span class="p">)</span>
<span class="n">background</span><span class="o">.</span><span class="n">paste</span><span class="p">(</span>
<span class="n">t_image</span><span class="p">,</span>
<span class="n">mask</span><span class="o">=</span><span class="n">t_image</span><span class="o">.</span><span class="n">split</span><span class="p">()[</span><span class="mi">3</span><span class="p">]</span>
<span class="p">)</span>
<span class="n">background</span><span class="o">.</span><span class="n">save</span><span class="p">(</span>
<span class="s1">&#39;qr.jpg&#39;</span><span class="p">,</span> <span class="s2">&quot;JPEG&quot;</span><span class="p">,</span>
<span class="n">quality</span><span class="o">=</span><span class="mi">100</span>
<span class="p">)</span>
</code></pre></div>
We use Image from python-pillow to change the background from transparent
to white. Opencv seems unable to consume the qrcode when it has a transparent
background.</p>
<h2 id="extract-data-from-qrcode"><strong>Extract Data From QRCODE</strong></h2>
<div class="highlight"><pre><span></span><code><span class="k">class</span> <span class="nc">TestEnableTOTPViewTestCase</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="o">...</span>
<span class="k">def</span> <span class="nf">test_enable_totp_view</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="o">...</span>
<span class="n">image</span> <span class="o">=</span> <span class="n">cv2</span><span class="o">.</span><span class="n">imread</span><span class="p">(</span><span class="s1">&#39;qr.jpg&#39;</span><span class="p">)</span>
<span class="n">qr_det</span> <span class="o">=</span> <span class="n">cv2</span><span class="o">.</span><span class="n">QRCodeDetector</span><span class="p">()</span>
<span class="n">qrdata</span> <span class="o">=</span> <span class="n">qr_det</span><span class="o">.</span><span class="n">detectAndDecode</span><span class="p">(</span><span class="n">image</span><span class="p">)</span>
<span class="n">totp_code</span> <span class="o">=</span> <span class="n">pyotp</span><span class="o">.</span><span class="n">TOTP</span><span class="p">(</span>
<span class="n">pyotp</span><span class="o">.</span><span class="n">parse_uri</span><span class="p">(</span><span class="n">qrdata</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span><span class="o">.</span><span class="n">secret</span>
<span class="p">)</span><span class="o">.</span><span class="n">now</span><span class="p">()</span>
</code></pre></div>
<ul>
<li><code>qrdata[0]</code> will be the <em>otpauth_uri</em>.</li>
<li><code>pyotp.parse_uri(qrdata[0]).secret</code> is the secret key.</li>
<li><code>totp_code</code> is the one-time password.</li>
</ul>
<h2 id="post-the-totp_code"><strong>POST the <code>totp_code</code></strong></h2>
<p><div class="highlight"><pre><span></span><code><span class="k">class</span> <span class="nc">TestEnableTOTPViewTestCase</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="o">...</span>
<span class="k">def</span> <span class="nf">test_enable_totp_view</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="o">...</span>
<span class="n">totp_code</span> <span class="o">=</span> <span class="n">pyotp</span><span class="o">.</span><span class="n">TOTP</span><span class="p">(</span>
<span class="n">pyotp</span><span class="o">.</span><span class="n">parse_uri</span><span class="p">(</span><span class="n">qrdata</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span><span class="o">.</span><span class="n">secret</span>
<span class="p">)</span><span class="o">.</span><span class="n">now</span><span class="p">()</span>
<span class="n">response</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">post</span><span class="p">(</span>
<span class="n">reverse</span><span class="p">(</span><span class="s1">&#39;accounts:enable_totp&#39;</span><span class="p">),</span>
<span class="p">{</span><span class="s1">&#39;totp_code&#39;</span><span class="p">:</span> <span class="n">totp_code</span><span class="p">},</span>
<span class="n">follow</span><span class="o">=</span><span class="kc">True</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="n">response</span><span class="o">.</span><span class="n">status_code</span><span class="p">,</span> <span class="mi">200</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertTemplateUsed</span><span class="p">(</span>
<span class="n">response</span><span class="p">,</span> <span class="s1">&#39;base_form.html&#39;</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="n">response</span><span class="o">.</span><span class="n">request</span><span class="p">[</span><span class="s1">&#39;PATH_INFO&#39;</span><span class="p">],</span>
<span class="s1">&#39;/accounts/edit-profile/&#39;</span>
<span class="p">)</span>
<span class="n">user_a</span> <span class="o">=</span> <span class="n">User</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">get</span><span class="p">(</span>
<span class="n">username</span><span class="o">=</span><span class="s1">&#39;user_a&#39;</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertTrue</span><span class="p">(</span><span class="n">user_a</span><span class="o">.</span><span class="n">account</span><span class="o">.</span><span class="n">use_totp</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="nb">len</span><span class="p">(</span><span class="n">user_a</span><span class="o">.</span><span class="n">account</span><span class="o">.</span><span class="n">totp_key</span><span class="p">),</span> <span class="mi">16</span>
<span class="p">)</span>
<span class="n">pathlib</span><span class="o">.</span><span class="n">Path</span><span class="p">(</span><span class="s1">&#39;qr.svg&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">unlink</span><span class="p">()</span>
<span class="n">pathlib</span><span class="o">.</span><span class="n">Path</span><span class="p">(</span><span class="s1">&#39;qr.png&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">unlink</span><span class="p">()</span>
<span class="n">pathlib</span><span class="o">.</span><span class="n">Path</span><span class="p">(</span><span class="s1">&#39;qr.jpg&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">unlink</span><span class="p">()</span>
</code></pre></div>
Post the <code>totp_code</code> back to the form, and then verify
that the database is updated, and then delete the image
files.</p>
<h2 id="complete-testcase"><strong>Complete TestCase</strong></h2>
<div class="highlight"><pre><span></span><code><span class="c1"># tp/accounts/tests/test_enable_totp_view.py</span>
<span class="c1"># python manage.py test accounts.tests.test_enable_totp_view</span>
<span class="kn">from</span> <span class="nn">django.test</span> <span class="kn">import</span> <span class="n">TestCase</span>
<span class="kn">from</span> <span class="nn">django.contrib.auth.models</span> <span class="kn">import</span> <span class="n">User</span>
<span class="kn">from</span> <span class="nn">accounts.models</span> <span class="kn">import</span> <span class="n">Account</span>
<span class="kn">from</span> <span class="nn">django.urls</span> <span class="kn">import</span> <span class="n">reverse</span>
<span class="kn">from</span> <span class="nn">bs4</span> <span class="kn">import</span> <span class="n">BeautifulSoup</span>
<span class="kn">import</span> <span class="nn">cv2</span>
<span class="kn">from</span> <span class="nn">cairosvg</span> <span class="kn">import</span> <span class="n">svg2png</span>
<span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">Image</span>
<span class="kn">import</span> <span class="nn">pyotp</span>
<span class="k">class</span> <span class="nc">TestEnableTOTPViewTestCase</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="c1"># setUP TestCase</span>
<span class="k">def</span> <span class="nf">setUp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">user_a</span> <span class="o">=</span> <span class="n">User</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">create</span><span class="p">(</span>
<span class="n">username</span><span class="o">=</span><span class="s1">&#39;user_a&#39;</span><span class="p">)</span>
<span class="n">user_a</span><span class="o">.</span><span class="n">set_password</span><span class="p">(</span><span class="s1">&#39;password_user_a&#39;</span><span class="p">)</span>
<span class="n">user_a</span><span class="o">.</span><span class="n">save</span><span class="p">()</span>
<span class="n">Account</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">user</span><span class="o">=</span><span class="n">user_a</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">test_enable_totp_view</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">login</span><span class="p">(</span>
<span class="n">username</span><span class="o">=</span><span class="s1">&#39;user_a&#39;</span><span class="p">,</span>
<span class="n">password</span><span class="o">=</span><span class="s1">&#39;password_user_a&#39;</span>
<span class="p">)</span>
<span class="c1"># GET Form</span>
<span class="n">get_response</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">get</span><span class="p">(</span>
<span class="n">reverse</span><span class="p">(</span><span class="s1">&#39;accounts:enable_totp&#39;</span><span class="p">)</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="n">get_response</span><span class="o">.</span><span class="n">status_code</span><span class="p">,</span> <span class="mi">200</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertTemplateUsed</span><span class="p">(</span>
<span class="n">get_response</span><span class="p">,</span> <span class="s1">&#39;accounts/totp_form.html&#39;</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="n">get_response</span><span class="o">.</span><span class="n">request</span><span class="p">[</span><span class="s1">&#39;PATH_INFO&#39;</span><span class="p">],</span>
<span class="s1">&#39;/accounts/enable-totp/&#39;</span>
<span class="p">)</span>
<span class="c1"># Consume SVG with BeautifulSoup</span>
<span class="n">soup</span> <span class="o">=</span> <span class="n">BeautifulSoup</span><span class="p">(</span>
<span class="n">get_response</span><span class="o">.</span><span class="n">content</span><span class="p">,</span> <span class="n">features</span><span class="o">=</span><span class="s2">&quot;lxml&quot;</span>
<span class="p">)</span>
<span class="n">svg_container</span> <span class="o">=</span> <span class="n">soup</span><span class="o">.</span><span class="n">find</span><span class="p">(</span>
<span class="s2">&quot;div&quot;</span><span class="p">,</span> <span class="p">{</span><span class="s2">&quot;id&quot;</span><span class="p">:</span> <span class="s2">&quot;svgcontainer&quot;</span><span class="p">}</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertIsNotNone</span><span class="p">(</span><span class="n">svg_container</span><span class="p">)</span>
<span class="n">scsvg</span> <span class="o">=</span> <span class="n">svg_container</span><span class="o">.</span><span class="n">findChild</span><span class="p">(</span>
<span class="s2">&quot;svg&quot;</span><span class="p">,</span> <span class="n">recursive</span><span class="o">=</span><span class="kc">False</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertIsNotNone</span><span class="p">(</span><span class="n">scsvg</span><span class="p">)</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s1">&#39;qr.svg&#39;</span><span class="p">,</span> <span class="s1">&#39;w&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">x_string</span> <span class="o">=</span> <span class="s2">&quot;&lt;?xml version=&#39;1.0&#39;&quot;</span>
<span class="n">x_string</span> <span class="o">+=</span> <span class="s2">&quot; encoding=&#39;utf-8&#39;?&gt;</span><span class="se">\n</span><span class="s2">&quot;</span>
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">x_string</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">scsvg</span><span class="p">))</span>
<span class="c1"># svg2png</span>
<span class="n">svg2png</span><span class="p">(</span>
<span class="n">url</span><span class="o">=</span><span class="s1">&#39;qr.svg&#39;</span><span class="p">,</span> <span class="n">write_to</span><span class="o">=</span><span class="s1">&#39;qr.png&#39;</span><span class="p">,</span>
<span class="n">scale</span><span class="o">=</span><span class="mi">8</span>
<span class="p">)</span>
<span class="c1"># add white background</span>
<span class="n">t_image</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s1">&#39;qr.png&#39;</span><span class="p">)</span>
<span class="n">t_image</span><span class="o">.</span><span class="n">load</span><span class="p">()</span>
<span class="n">background</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">new</span><span class="p">(</span>
<span class="s2">&quot;RGB&quot;</span><span class="p">,</span> <span class="n">t_image</span><span class="o">.</span><span class="n">size</span><span class="p">,</span>
<span class="p">(</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">)</span>
<span class="p">)</span>
<span class="n">background</span><span class="o">.</span><span class="n">paste</span><span class="p">(</span>
<span class="n">t_image</span><span class="p">,</span>
<span class="n">mask</span><span class="o">=</span><span class="n">t_image</span><span class="o">.</span><span class="n">split</span><span class="p">()[</span><span class="mi">3</span><span class="p">]</span>
<span class="p">)</span>
<span class="n">background</span><span class="o">.</span><span class="n">save</span><span class="p">(</span>
<span class="s1">&#39;qr.jpg&#39;</span><span class="p">,</span> <span class="s2">&quot;JPEG&quot;</span><span class="p">,</span>
<span class="n">quality</span><span class="o">=</span><span class="mi">100</span>
<span class="p">)</span>
<span class="c1"># extract data from qrcode</span>
<span class="n">image</span> <span class="o">=</span> <span class="n">cv2</span><span class="o">.</span><span class="n">imread</span><span class="p">(</span><span class="s1">&#39;qr.jpg&#39;</span><span class="p">)</span>
<span class="n">qr_det</span> <span class="o">=</span> <span class="n">cv2</span><span class="o">.</span><span class="n">QRCodeDetector</span><span class="p">()</span>
<span class="n">qrdata</span> <span class="o">=</span> <span class="n">qr_det</span><span class="o">.</span><span class="n">detectAndDecode</span><span class="p">(</span><span class="n">image</span><span class="p">)</span>
<span class="n">totp_code</span> <span class="o">=</span> <span class="n">pyotp</span><span class="o">.</span><span class="n">TOTP</span><span class="p">(</span>
<span class="n">pyotp</span><span class="o">.</span><span class="n">parse_uri</span><span class="p">(</span><span class="n">qrdata</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span><span class="o">.</span><span class="n">secret</span>
<span class="p">)</span><span class="o">.</span><span class="n">now</span><span class="p">()</span>
<span class="n">totp_code</span> <span class="o">=</span> <span class="n">pyotp</span><span class="o">.</span><span class="n">TOTP</span><span class="p">(</span>
<span class="n">pyotp</span><span class="o">.</span><span class="n">parse_uri</span><span class="p">(</span><span class="n">qrdata</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span><span class="o">.</span><span class="n">secret</span>
<span class="p">)</span><span class="o">.</span><span class="n">now</span><span class="p">()</span>
<span class="c1"># POST the `totp_code`</span>
<span class="n">response</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">post</span><span class="p">(</span>
<span class="n">reverse</span><span class="p">(</span><span class="s1">&#39;accounts:enable_totp&#39;</span><span class="p">),</span>
<span class="p">{</span><span class="s1">&#39;totp_code&#39;</span><span class="p">:</span> <span class="n">totp_code</span><span class="p">},</span>
<span class="n">follow</span><span class="o">=</span><span class="kc">True</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="n">response</span><span class="o">.</span><span class="n">status_code</span><span class="p">,</span> <span class="mi">200</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertTemplateUsed</span><span class="p">(</span>
<span class="n">response</span><span class="p">,</span> <span class="s1">&#39;base_form.html&#39;</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="n">response</span><span class="o">.</span><span class="n">request</span><span class="p">[</span><span class="s1">&#39;PATH_INFO&#39;</span><span class="p">],</span>
<span class="s1">&#39;/accounts/edit-profile/&#39;</span>
<span class="p">)</span>
<span class="n">user_a</span> <span class="o">=</span> <span class="n">User</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">get</span><span class="p">(</span>
<span class="n">username</span><span class="o">=</span><span class="s1">&#39;user_a&#39;</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertTrue</span><span class="p">(</span><span class="n">user_a</span><span class="o">.</span><span class="n">account</span><span class="o">.</span><span class="n">use_totp</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEquals</span><span class="p">(</span>
<span class="nb">len</span><span class="p">(</span><span class="n">user_a</span><span class="o">.</span><span class="n">account</span><span class="o">.</span><span class="n">totp_key</span><span class="p">),</span> <span class="mi">16</span>
<span class="p">)</span>
<span class="n">pathlib</span><span class="o">.</span><span class="n">Path</span><span class="p">(</span><span class="s1">&#39;qr.svg&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">unlink</span><span class="p">()</span>
<span class="n">pathlib</span><span class="o">.</span><span class="n">Path</span><span class="p">(</span><span class="s1">&#39;qr.png&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">unlink</span><span class="p">()</span>
<span class="n">pathlib</span><span class="o">.</span><span class="n">Path</span><span class="p">(</span><span class="s1">&#39;qr.jpg&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">unlink</span><span class="p">()</span>
</code></pre></div>
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