Flask: Jinja doesn't support absolute file paths

[jyn514]

Docs

I was trying to run {% include <filepath> %} in templates/index.html. Unfortunately, jinja gives an error that the file doesn't exist even when it's there because it doesn't support arbitrary file paths. My current workaround is to put ln -s / root in templates and {% include 'root/' + <filepath> %}, which is hardly ideal.

The easiest way to fix this is just have snaps in the working directory, but I like the idea of having a global cache. Still considering how to implement this.

Traceback

Traceback (most recent call last):
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/joshua/Documents/Programming/Python/Colahacks/index.py", line 39, in main
    return render_template("index.html", **session)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/templating.py", line 134, in render_template
    context, ctx.app)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/templating.py", line 116, in _render
    rv = template.render(context)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/jinja2/asyncsupport.py", line 76, in render
    return original_render(self, *args, **kwargs)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/jinja2/environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "/home/joshua/Documents/Programming/Python/Colahacks/templates/index.html", line 1, in top-level template code
    {% extends "base.html" %}
  File "/home/joshua/Documents/Programming/Python/Colahacks/templates/base.html", line 17, in top-level template code
    {% block content %}No Content{% endblock %}
  File "/home/joshua/Documents/Programming/Python/Colahacks/templates/index.html", line 80, in block "content"
    <hr>{% include SAVE_ROOT + '/' + project + '/' + current + '/output.html' %}
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/templating.py", line 57, in get_source
    return self._get_source_fast(environment, template)
  File "/usr/local/lib/miniconda/lib/python3.6/site-packages/flask/templating.py", line 85, in _get_source_fast
    raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: /home/joshua/.cache/snap/Colahacks/08b0789c0db460d567d0fdb999a71d0a97f49da6/output.html

[hdamron17]

My fix was to just pass the file texts as a string. No code file should be so long that it’s a huge issue at least for now. (Since our purpose is instruction)

[jyn514]

This doesn't work for any sort of binary file. I know this is primarily for instruction, but it will crash on pictures, databases, anything that isn't valid unicode.

Traceback:

127.0.0.1 - - [19/May/2018 16:19:11] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [19/May/2018 16:19:13] "GET /?project=Colahacks HTTP/1.1" 200 -
127.0.0.1 - - [19/May/2018 16:19:14] "GET /?codefile=.backupzips%2Fcppdemo1.zip HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/app.py", line 2309, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/app.py", line 2295, in wsgi_app
    response = self.handle_exception(e)
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/app.py", line 1741, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/joshua/.local/lib/python3.6/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/joshua/Documents/Programming/Python/Colahacks/index.py", line 154, in main
    other_vars['code_file'] = cfile.read()
  File "/usr/lib64/python3.6/codecs.py", line 321, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x82 in position 11: invalid start byte