/**
* Loop over a signer tag looking for seinfo, package and cert tags. A {@link Policy} instance
* will be created and returned in the process. During the pass all other tag elements will be
* skipped.
*
* @param parser an XmlPullParser object representing a signer element.
* @return the constructed {@link Policy} instance
* @throws IOException
* @throws XmlPullParserException
* @throws IllegalArgumentException if any of the validation checks fail while parsing tag values.
* @throws IllegalStateException if any of the invariants fail when constructing the {@link
* Policy} instance.
*/
private static Policy readSignerOrThrow(XmlPullParser parser)
throws IOException, XmlPullParserException {
parser.require(XmlPullParser.START_TAG, null, "signer");
Policy.PolicyBuilder pb = new Policy.PolicyBuilder();
// Check for a cert attached to the signer tag. We allow a signature
// to appear as an attribute as well as those attached to cert tags.
String cert = parser.getAttributeValue(null, "signature");
if (cert != null) {
pb.addSignature(cert);
}
while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
String tagName = parser.getName();
if ("seinfo".equals(tagName)) {
String seinfo = parser.getAttributeValue(null, "value");
pb.setGlobalSeinfoOrThrow(seinfo);
readSeinfo(parser);
} else if ("package".equals(tagName)) {
readPackageOrThrow(parser, pb);
} else if ("cert".equals(tagName)) {
String sig = parser.getAttributeValue(null, "signature");
pb.addSignature(sig);
readCert(parser);
} else {
skip(parser);
}
}
return pb.build();
}
/**
* Loop over a package element looking for seinfo child tags. If found return the value attribute
* of the seinfo tag, otherwise return null. All other tags encountered will be skipped.
*
* @param parser an XmlPullParser object representing a package element.
* @param pb a Policy.PolicyBuilder instance to build
* @throws IOException
* @throws XmlPullParserException
* @throws IllegalArgumentException if any of the validation checks fail while parsing tag values.
* @throws IllegalStateException if there is a duplicate seinfo tag for the current package tag.
*/
private static void readPackageOrThrow(XmlPullParser parser, Policy.PolicyBuilder pb)
throws IOException, XmlPullParserException {
parser.require(XmlPullParser.START_TAG, null, "package");
String pkgName = parser.getAttributeValue(null, "name");
while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
String tagName = parser.getName();
if ("seinfo".equals(tagName)) {
String seinfo = parser.getAttributeValue(null, "value");
pb.addInnerPackageMapOrThrow(pkgName, seinfo);
readSeinfo(parser);
} else {
skip(parser);
}
}
}
