xhtml2pdf in django - issue link_callback - django-templates

Question

I am trying to generate a pdf from an html-template in django. Therefore i use pretty much the basic methods found in the web. The issue is that in can get it to generate the content of my template, but not the images from my media directory. I always get the following error:
SuspiciousFileOperation at /manager/createpdf/
The joined path is located outside of the base path component
Since i can get some result, i assume that nothing is wrong with my view. Here is my render_to_pdf
def render_to_pdf(template_src, context_dict):
template = get_template(template_src)
html = template.render(context_dict)
result = BytesIO()
pdf = pisa.pisaDocument(BytesIO(html.encode('UTF-8')), result, link_callback=link_callback)
if not pdf.err:
return HttpResponse(result.getvalue(), content_type='application/pdf')
return None
and the link_callback:
def link_callback(uri, rel):
result = finders.find(uri)
if result:
if not isinstance(result, (list, tuple)):
result = [result]
result = list(os.path.realpath(path) for path in result)
path=result[0]
else:
sUrl = settings.STATIC_URL
sRoot = settings.STATIC_ROOT
mUrl = settings.MEDIA_URL
mRoot = settings.MEDIA_ROOT
if uri.startswith(mUrl):
path = os.path.join(mRoot, uri.replace(mUrl, ""))
elif uri.startswith(sUrl):
path = os.path.join(sRoot, uri.replace(sUrl, ""))
else:
return uri
# make sure that file exists
if not os.path.isfile(path):
raise Exception( 'media URI must start with %s or %s' % (sUrl, mUrl))
return path
I am pretty much sure that the link_callback doesnt do it's purpose. But my knowledge is to little to patch it. I also assume that i configured the media directory correctly. I can access the media files in other views/templates.
Help is very appreciated, since i spend quiet some hours on this issue... A big thx to all the are going to contribute here!

Answer 1

OK, i found it! In the finders.py i checked the find-method. It turns out that the find method only looks for files in the static directory and disregards the media directory. i just deleted all the lins and it works now. Here is the code:
def link_callback(uri, rel):
sUrl = settings.STATIC_URL
sRoot = settings.STATIC_ROOT
mUrl = settings.MEDIA_URL
mRoot = settings.MEDIA_ROOT
if uri.startswith(mUrl):
path = os.path.join(mRoot, uri.replace(mUrl, ""))
elif uri.startswith(sUrl):
path = os.path.join(sRoot, uri.replace(sUrl, ""))
else:
return uri
if not os.path.isfile(path):
raise Exception( 'media URI must start with %s or %s' % (sUrl, mUrl))
return path