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caps: handle multiple data forms of extened service discovery information

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This commit is contained in:
Florian Schmaus 2020-04-18 22:56:24 +02:00
parent 5e921e6393
commit e79710840b
1 changed files with 36 additions and 40 deletions
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76
smack-extensions/src/main/java/org/jivesoftware/smackx/caps/EntityCapsManager.java
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@ -19,6 +19,7 @@ package org.jivesoftware.smackx.caps;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedList;
@ -664,8 +665,6 @@ public final class EntityCapsManager extends Manager {
// be "broken" implementation in the wild, so we *always* transform to lowercase.
hash = hash.toLowerCase(Locale.US);
DataForm extendedInfo = DataForm.from(discoverInfo);
// 1. Initialize an empty string S ('sb' in this method).
StringBuilder sb = new StringBuilder(); // Use StringBuilder as we don't
// need thread-safe StringBuffer
@ -705,50 +704,47 @@ public final class EntityCapsManager extends Manager {
sb.append('<');
}
// only use the data form for calculation is it has a hidden FORM_TYPE
// field
// see XEP-0115 5.4 step 3.6
if (extendedInfo != null && extendedInfo.hasHiddenFormTypeField()) {
synchronized (extendedInfo) {
// 6. If the service discovery information response includes
// XEP-0128 data forms, sort the forms by the FORM_TYPE (i.e.,
// by the XML character data of the <value/> element).
SortedSet<FormField> fs = new TreeSet<>(new Comparator<FormField>() {
@Override
public int compare(FormField f1, FormField f2) {
return f1.getVariable().compareTo(f2.getVariable());
}
});
List<DataForm> extendedInfos = discoverInfo.getExtensions(DataForm.class);
for (DataForm extendedInfo : extendedInfos) {
if (!extendedInfo.hasHiddenFormTypeField()) {
// Only use the data form for calculation is it has a hidden FORM_TYPE field.
// See XEP-0115 5.4 step 3.f
continue;
}
FormField ft = null;
for (FormField f : extendedInfo.getFields()) {
if (!f.getVariable().equals("FORM_TYPE")) {
fs.add(f);
} else {
ft = f;
}
// 6. If the service discovery information response includes
// XEP-0128 data forms, sort the forms by the FORM_TYPE (i.e.,
// by the XML character data of the <value/> element).
SortedSet<FormField> fs = new TreeSet<>(new Comparator<FormField>() {
@Override
public int compare(FormField f1, FormField f2) {
return f1.getVariable().compareTo(f2.getVariable());
}
});
// Add FORM_TYPE values
if (ft != null) {
formFieldValuesToCaps(ft.getValues(), sb);
}
// 7. 3. For each field other than FORM_TYPE:
// 1. Append the value of the "var" attribute, followed by the
// '<' character.
// 2. Sort values by the XML character data of the <value/>
// element.
// 3. For each <value/> element, append the XML character data,
// followed by the '<' character.
for (FormField f : fs) {
sb.append(f.getVariable());
sb.append('<');
formFieldValuesToCaps(f.getValues(), sb);
for (FormField f : extendedInfo.getFields()) {
if (!f.getVariable().equals("FORM_TYPE")) {
fs.add(f);
}
}
// Add FORM_TYPE values
formFieldValuesToCaps(Collections.singletonList(extendedInfo.getFormType()), sb);
// 7. 3. For each field other than FORM_TYPE:
// 1. Append the value of the "var" attribute, followed by the
// '<' character.
// 2. Sort values by the XML character data of the <value/>
// element.
// 3. For each <value/> element, append the XML character data,
// followed by the '<' character.
for (FormField f : fs) {
sb.append(f.getVariable());
sb.append('<');
formFieldValuesToCaps(f.getValues(), sb);
}
}
// 8. Ensure that S is encoded according to the UTF-8 encoding (RFC
// 3269).
// 9. Compute the verification string by hashing S using the algorithm