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[xdata] Use extra registry for fields in clark notation

Browse source 
If a field name is in clark notation, then lookup the field's type via
an extra registry.
This commit is contained in:
Florian Schmaus 2021-02-21 13:01:43 +01:00
parent ce4f85acf8
commit 1c262471e5
3 changed files with 69 additions and 88 deletions
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9
smack-core/src/main/java/org/jivesoftware/smack/util/XmlUtil.java
View file

@ -64,4 +64,13 @@ public class XmlUtil {
return stringWriter.toString();
}
public static boolean isClarkNotation(String text) {
if (text.isEmpty()) {
return false;
}
// TODO: This is currently a mediocre heuristic to check for clark notation.
return text.charAt(0) == '{';
}
}

127
smack-extensions/src/main/java/org/jivesoftware/smackx/formtypes/FormFieldRegistry.java
View file

@ -1,6 +1,6 @@
/**
*
* Copyright 2020 Florian Schmaus
* Copyright 2020-2021 Florian Schmaus
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -18,27 +18,26 @@ package org.jivesoftware.smackx.formtypes;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;
import org.jivesoftware.smack.util.Objects;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smack.util.XmlUtil;
import org.jivesoftware.smackx.xdata.FormField;
import org.jivesoftware.smackx.xdata.TextSingleFormField;
import org.jivesoftware.smackx.xdata.packet.DataForm;
public class FormFieldRegistry {
private static final Logger LOGGER = Logger.getLogger(FormFieldRegistry.class.getName());
private static final Map<String, Map<String, FormField.Type>> REGISTRY = new HashMap<>();
private static final Map<String, FormField.Type> LOOKASIDE_REGISTRY = new HashMap<>();
private static final Map<String, String> FIELD_NAME_TO_FORM_TYPE = new HashMap<>();
static {
register(FormField.FORM_TYPE, FormField.Type.hidden);
}
private static final Map<String, FormField.Type> CLARK_NOTATION_FIELD_REGISTRY = new ConcurrentHashMap<>();
@SuppressWarnings("ReferenceEquality")
public static synchronized void register(DataForm dataForm) {
public static void register(DataForm dataForm) {
// TODO: Also allow forms of type 'result'?
if (dataForm.getType() != DataForm.Type.form) {
throw new IllegalArgumentException();
@ -56,64 +55,57 @@ public class FormFieldRegistry {
continue;
}
String fieldName = formField.getFieldName();
FormField.Type type = formField.getType();
if (type == FormField.Type.fixed) {
continue;
}
String fieldName = formField.getFieldName();
register(formType, fieldName, type);
}
}
public static synchronized void register(String formType, String fieldName, FormField.Type type) {
public static void register(String formType, String fieldName, FormField.Type fieldType) {
StringUtils.requireNotNullNorEmpty(fieldName, "fieldName must be provided");
Objects.requireNonNull(fieldType);
if (formType == null) {
FormFieldInformation formFieldInformation = lookup(fieldName);
if (formFieldInformation != null) {
if (Objects.equals(formType, formFieldInformation.formType)
&& type.equals(formFieldInformation.formFieldType)) {
// The field is already registered, nothing to do here.
return;
}
String message = "There is already a field with the name'" + fieldName
+ "' registered with the field type '" + formFieldInformation.formFieldType
+ "', while this tries to register the field with the type '" + type + '\'';
throw new IllegalArgumentException(message);
if (XmlUtil.isClarkNotation(fieldName)) {
CLARK_NOTATION_FIELD_REGISTRY.put(fieldName, fieldType);
}
LOOKASIDE_REGISTRY.put(fieldName, type);
return;
}
Map<String, FormField.Type> fieldNameToType = REGISTRY.get(formType);
if (fieldNameToType == null) {
fieldNameToType = new HashMap<>();
REGISTRY.put(formType, fieldNameToType);
} else {
FormField.Type previousType = fieldNameToType.get(fieldName);
if (previousType != null && previousType != type) {
throw new IllegalArgumentException();
FormField.Type previousType;
synchronized (REGISTRY) {
Map<String, FormField.Type> fieldNameToType = REGISTRY.get(formType);
if (fieldNameToType == null) {
fieldNameToType = new HashMap<>();
REGISTRY.put(formType, fieldNameToType);
} else {
previousType = fieldNameToType.get(fieldName);
if (previousType != null && previousType != fieldType) {
throw new IllegalArgumentException();
}
}
previousType = fieldNameToType.put(fieldName, fieldType);
}
fieldNameToType.put(fieldName, type);
FIELD_NAME_TO_FORM_TYPE.put(fieldName, formType);
}
public static synchronized void register(String fieldName, FormField.Type type) {
FormField.Type previousType = LOOKASIDE_REGISTRY.get(fieldName);
if (previousType != null) {
if (previousType == type) {
// Nothing to do here.
return;
}
throw new IllegalArgumentException("There is already a field with the name '" + fieldName
+ "' registered with type " + previousType
+ ", while trying to register this field with type '" + type + "'");
if (previousType != null && fieldType != previousType) {
LOGGER.warning("Form field registry inconsitency detected: Registered field '" + fieldName + "' of type " + fieldType + " but previous type was " + previousType);
}
LOOKASIDE_REGISTRY.put(fieldName, type);
}
public static synchronized FormField.Type lookup(String formType, String fieldName) {
if (formType != null) {
public static FormField.Type lookup(String formType, String fieldName) {
if (formType == null) {
if (!XmlUtil.isClarkNotation(fieldName)) {
return null;
}
return CLARK_NOTATION_FIELD_REGISTRY.get(fieldName);
}
synchronized (REGISTRY) {
Map<String, FormField.Type> fieldNameToTypeMap = REGISTRY.get(formType);
if (fieldNameToTypeMap != null) {
FormField.Type type = fieldNameToTypeMap.get(fieldName);
@ -121,38 +113,13 @@ public class FormFieldRegistry {
return type;
}
}
} else {
formType = FIELD_NAME_TO_FORM_TYPE.get(fieldName);
if (formType != null) {
FormField.Type type = lookup(formType, fieldName);
if (type != null) {
return type;
}
}
}
// Fallback to lookaside registry.
return LOOKASIDE_REGISTRY.get(fieldName);
return null;
}
public static synchronized FormFieldInformation lookup(String fieldName) {
String formType = FIELD_NAME_TO_FORM_TYPE.get(fieldName);
FormField.Type type = lookup(formType, fieldName);
if (type == null) {
return null;
}
return new FormFieldInformation(type, formType);
public static synchronized FormField.Type lookup(String fieldName) {
return lookup(null, fieldName);
}
public static final class FormFieldInformation {
public final FormField.Type formFieldType;
public final String formType;
private FormFieldInformation(FormField.Type formFieldType, String formType) {
this.formFieldType = formFieldType;
this.formType = formType;
}
}
}

21
smack-extensions/src/main/java/org/jivesoftware/smackx/xdata/provider/DataFormProvider.java
View file

@ -207,14 +207,19 @@ public class DataFormProvider extends ExtensionElementProvider<DataForm> {
}
if (type == null) {
// If no field type was explicitly provided, then we need to lookup the
// field's type in the registry.
type = FormFieldRegistry.lookup(formType, fieldName);
if (type == null) {
LOGGER.warning("The Field '" + fieldName + "' from FORM_TYPE '" + formType
+ "' is not registered. Field type is unknown, assuming text-single.");
// As per XEP-0004, text-single is the default form field type, which we use as emergency fallback here.
type = FormField.Type.text_single;
// The field name 'FORM_TYPE' is magic.
if (fieldName.equals(FormField.FORM_TYPE)) {
type = FormField.Type.hidden;
} else {
// If no field type was explicitly provided, then we need to lookup the
// field's type in the registry.
type = FormFieldRegistry.lookup(formType, fieldName);
if (type == null) {
LOGGER.warning("The Field '" + fieldName + "' from FORM_TYPE '" + formType
+ "' is not registered. Field type is unknown, assuming text-single.");
// As per XEP-0004, text-single is the default form field type, which we use as emergency fallback here.
type = FormField.Type.text_single;
}
}
}