validator.py

   1 import os, io
   2 from zeroinstall.injector import model, namespaces
   3 from zeroinstall.injector.reader import InvalidInterface, update
   4 from xml.dom import minidom, Node, XMLNS_NAMESPACE
   5 import tempfile
   6 from logging import warn, info
   7
   8 group_impl_attribs = ['version', 'version-modifier', 'released', 'main', 'stability', 'arch', 'license', 'doc-dir', 'self-test', 'langs', 'local-path']
   9
  10 known_elements = {
  11         'interface' : ['uri', 'min-injector-version', 'main'],  # (main is deprecated)
  12         'name' : [],
  13         'summary' : [],
  14         'description' : [],
  15         'needs-terminal' : [],
  16         'homepage' : [],
  17         'category' : ['type'],
  18         'icon' : ['type', 'href'],
  19         'feed' : ['src', 'arch'],
  20         'feed-for' : ['interface'],
  21         'replaced-by' : ['interface'],
  22
  23         'group' : group_impl_attribs,
  24         'implementation' : ['id'] + group_impl_attribs,
  25         'package-implementation' : ['package', 'main', 'distributions'],
  26         'manifest-digest' : ['sha1new', 'sha256', 'sha256new'],
  27         'command' : ['name', 'path', 'shell-command'],
  28         'arg' : [],
  29
  30         'archive' : ['href', 'size', 'extract', 'type', 'start-offset'],
  31         'recipe' : [],
  32         'requires' : ['interface', 'use', 'importance'],
  33         'runner' : ['interface', 'use', 'importance', 'command'],
  34         'version' : ['not-before', 'before'],
  35         'environment' : ['name', 'insert', 'value', 'default', 'mode'],
  36         'executable-in-var' : ['name', 'command'],
  37         'executable-in-path' : ['name', 'command'],
  38         #'overlay' : ['src', 'mount-point'],
  39 }
  40
  41 def checkElement(elem):
  42         if elem.namespaceURI != namespaces.XMLNS_IFACE:
  43                 info("Note: Skipping unknown (but namespaced) element <%s>", elem.localName)
  44                 return  # Namespaces elements are OK
  45
  46         if elem.localName not in known_elements:
  47                 warn("Unknown Zero Install element <%s>.\nNon Zero-Install elements should be namespaced.", elem.localName)
  48                 return
  49
  50         known_attrs = known_elements[elem.localName]
  51
  52         for (uri, name), value in elem.attributes.itemsNS():
  53                 if uri == XMLNS_NAMESPACE:
  54                         continue        # Namespace declarations are fine
  55
  56                 if uri:
  57                         info("Note: Skipping unknown (but namespaced) attribute '%s'", name)
  58                         continue
  59
  60                 if name not in known_attrs:
  61                         warn("Unknown Zero Install attribute '%s' on <%s>.\nNon Zero-Install attributes should be namespaced.",
  62                                         name, elem.localName)
  63
  64         for child in elem.childNodes:
  65                 if child.nodeType == Node.ELEMENT_NODE:
  66                         checkElement(child)
  67
  68 def check(data, warnings = True):
  69         assert type(data) == bytes, type(data)  # (must not be unicode)
  70         fd, tmp_name = tempfile.mkstemp(prefix = '0publish-validate-')
  71         os.close(fd)
  72         tmp_iface = model.Interface(tmp_name)
  73         try:
  74                 with io.open(tmp_name, 'wb') as stream:
  75                         stream.write(data)
  76                 try:
  77                         update(tmp_iface, tmp_name, local = True)
  78                 except InvalidInterface, ex:
  79                         raise
  80                 except Exception, ex:
  81                         warn("Internal error: %s", ex)
  82                         raise InvalidInterface(str(ex))
  83         finally:
  84                 os.unlink(tmp_name)
  85
  86         if warnings:
  87                 doc = minidom.parseString(data)
  88                 checkElement(doc.documentElement)