Add new document signature app

2011-12-25 16:07:45 -04:00
parent 8c455fd42f
commit d9621dfb1f
6 changed files with 257 additions and 0 deletions
--- a/apps/document_signatures/views.py
+++ b/apps/document_signatures/views.py
@@ -0,0 +1,127 @@
+from __future__ import absolute_import
+
+from datetime import datetime
+import logging
+
+from django.utils.translation import ugettext_lazy as _
+from django.http import HttpResponseRedirect
+from django.shortcuts import render_to_response, get_object_or_404
+from django.template import RequestContext
+from django.contrib import messages
+from django.core.urlresolvers import reverse
+from django.utils.safestring import mark_safe
+from django.conf import settings
+from django.template.defaultfilters import force_escape
+
+from documents.models import Document, RecentDocument
+from permissions.api import check_permissions
+from common.utils import pretty_size, parse_range, urlquote, \
+    return_diff, encapsulate
+from filetransfers.api import serve_file
+   
+from django_gpg.api import Key, SIGNATURE_STATES
+from django_gpg.runtime import gpg
+from django_gpg.exceptions import (GPGVerificationError, KeyFetchingError,
+    KeyImportError)
+
+from . import (PERMISSION_DOCUMENT_VERIFY, PERMISSION_SIGNATURE_UPLOAD,
+    PERMISSION_SIGNATURE_DOWNLOAD)
+from .forms import DetachedSignatureForm
+from .models import DocumentVersionSignature
+
+logger = logging.getLogger(__name__)
+    
+
+def document_verify(request, document_pk):
+    check_permissions(request.user, [PERMISSION_DOCUMENT_VERIFY])
+    document = get_object_or_404(Document, pk=document_pk)
+
+    RecentDocument.objects.add_document_for_user(request.user, document)
+    
+    signature = document.verify_signature()
+    
+    signature_state = SIGNATURE_STATES.get(getattr(signature, 'status', None))
+    
+    widget = (u'<img style="vertical-align: middle;" src="%simages/icons/%s" />' % (settings.STATIC_URL, signature_state['icon']))
+    paragraphs = [
+        _(u'Signature status: %(widget)s %(text)s') % {
+            'widget': mark_safe(widget),
+            'text': signature_state['text']
+        },
+    ]
+
+    if document.signature_state:
+        signature_type = _(u'embedded')
+    else:
+        signature_type = _(u'detached')
+
+    if signature:
+        paragraphs.extend(
+            [
+                _(u'Signature ID: %s') % signature.signature_id,
+                _(u'Signature type: %s') % signature_type,
+                _(u'Key ID: %s') % signature.key_id,
+                _(u'Timestamp: %s') % datetime.fromtimestamp(int(signature.sig_timestamp)),
+                _(u'Signee: %s') % force_escape(getattr(signature, 'username', u'')),
+            ]
+        )
+    
+    return render_to_response('generic_template.html', {
+        'title': _(u'signature properties for: %s') % document,
+        'object': document,
+        'document': document,
+        'paragraphs': paragraphs,
+    }, context_instance=RequestContext(request))
+    
+    
+def document_signature_upload(request, document_pk):
+    check_permissions(request.user, [PERMISSION_SIGNATURE_UPLOAD])
+    document = get_object_or_404(Document, pk=document_pk)
+
+    RecentDocument.objects.add_document_for_user(request.user, document)
+        
+    post_action_redirect = None
+    previous = request.POST.get('previous', request.GET.get('previous', request.META.get('HTTP_REFERER', '/')))
+    next = request.POST.get('next', request.GET.get('next', post_action_redirect if post_action_redirect else request.META.get('HTTP_REFERER', '/')))
+
+    if request.method == 'POST':
+        form = DetachedSignatureForm(request.POST, request.FILES)
+        if form.is_valid():
+            try:
+                document.add_detached_signature(request.FILES['file'])
+                messages.success(request, _(u'Detached signature uploaded successfully.'))
+                return HttpResponseRedirect(next)
+            except Exception, msg:
+                messages.error(request, msg)
+                return HttpResponseRedirect(previous)
+    else:
+        form = DetachedSignatureForm()
+
+    return render_to_response('generic_form.html', {
+        'title': _(u'Upload detached signature for: %s') % document,
+        'form_icon': 'key_delete.png',
+        'next': next,
+        'form': form,
+        'previous': previous,
+        'object': document,
+    }, context_instance=RequestContext(request))
+    
+    
+def document_signature_download(request, document_pk):
+    check_permissions(request.user, [PERMISSION_SIGNATURE_DOWNLOAD])
+    document = get_object_or_404(Document, pk=document_pk)
+        
+    try:
+        if document.has_detached_signature():
+            signature = document.detached_signature()
+            return serve_file(
+                request,
+                signature,
+                save_as=u'"%s.sig"' % document.filename,
+                content_type=u'application/octet-stream'
+            )
+    except Exception, e:
+        messages.error(request, e)
+        return HttpResponseRedirect(request.META['HTTP_REFERER'])
+
+    return HttpResponseRedirect(request.META['HTTP_REFERER'])