2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.restconf.nb.rfc8040.utils.parser;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.base.CharMatcher;
13 import com.google.common.collect.ImmutableList;
14 import com.google.common.collect.ImmutableMap;
15 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
16 import java.util.ArrayList;
17 import java.util.Iterator;
18 import java.util.List;
19 import java.util.Optional;
20 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
21 import org.opendaylight.restconf.common.util.RestUtil;
22 import org.opendaylight.restconf.common.util.RestconfSchemaUtil;
23 import org.opendaylight.restconf.nb.rfc8040.codecs.RestCodec;
24 import org.opendaylight.yangtools.yang.common.ErrorTag;
25 import org.opendaylight.yangtools.yang.common.ErrorType;
26 import org.opendaylight.yangtools.yang.common.QName;
27 import org.opendaylight.yangtools.yang.common.YangNames;
28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
29 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
30 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
31 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextNode;
32 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
33 import org.opendaylight.yangtools.yang.model.api.ActionDefinition;
34 import org.opendaylight.yangtools.yang.model.api.ActionNodeContainer;
35 import org.opendaylight.yangtools.yang.model.api.ContainerLike;
36 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
37 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
38 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
39 import org.opendaylight.yangtools.yang.model.api.IdentitySchemaNode;
40 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
41 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
42 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
43 import org.opendaylight.yangtools.yang.model.api.Module;
44 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
45 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
46 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
47 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
48 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
49 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
50 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack;
53 * Deserializer for {@link String} to {@link YangInstanceIdentifier} for restconf.
55 public final class YangInstanceIdentifierDeserializer {
56 private static final CharMatcher IDENTIFIER_PREDICATE =
57 CharMatcher.noneOf(ParserConstants.RFC3986_RESERVED_CHARACTERS).precomputed();
58 private static final CharMatcher PERCENT_ENCODING = CharMatcher.is('%');
59 // position of the first encoded char after percent sign in percent encoded string
60 private static final int FIRST_ENCODED_CHAR = 1;
61 // position of the last encoded char after percent sign in percent encoded string
62 private static final int LAST_ENCODED_CHAR = 3;
63 // percent encoded radix for parsing integers
64 private static final int PERCENT_ENCODED_RADIX = 16;
66 private final EffectiveModelContext schemaContext;
67 private final String data;
69 private DataSchemaContextNode<?> current;
72 private YangInstanceIdentifierDeserializer(final EffectiveModelContext schemaContext, final String data) {
73 this.schemaContext = requireNonNull(schemaContext);
74 this.data = requireNonNull(data);
75 current = DataSchemaContextTree.from(schemaContext).getRoot();
79 * Method to create {@link Iterable} from {@link PathArgument} which are parsing from data by {@link SchemaContext}.
81 * @param schemaContext for validate of parsing path arguments
82 * @param data path to data, in URL string form
83 * @return {@link Iterable} of {@link PathArgument}
85 public static List<PathArgument> create(final EffectiveModelContext schemaContext, final String data) {
86 return new YangInstanceIdentifierDeserializer(schemaContext, data).parse();
89 private List<PathArgument> parse() {
90 final List<PathArgument> path = new ArrayList<>();
92 while (!allCharsConsumed()) {
94 final QName qname = prepareQName();
96 // this is the last identifier (input is consumed) or end of identifier (slash)
97 if (allCharsConsumed() || currentChar() == '/') {
98 prepareIdentifier(qname, path);
99 path.add(current == null ? NodeIdentifier.create(qname) : current.getIdentifier());
100 } else if (currentChar() == '=') {
101 if (nextContextNode(qname, path).getDataSchemaNode() instanceof ListSchemaNode) {
102 prepareNodeWithPredicates(qname, path, (ListSchemaNode) current.getDataSchemaNode());
104 prepareNodeWithValue(qname, path);
107 throw getParsingCharFailedException();
111 return ImmutableList.copyOf(path);
114 private void prepareNodeWithPredicates(final QName qname, final List<PathArgument> path,
115 final ListSchemaNode listSchemaNode) {
116 checkValid(listSchemaNode != null, ErrorTag.MALFORMED_MESSAGE, "Data schema node is null");
118 final Iterator<QName> keys = listSchemaNode.getKeyDefinition().iterator();
119 final ImmutableMap.Builder<QName, Object> values = ImmutableMap.builder();
121 // skip already expected equal sign
124 // read key value separated by comma
125 while (keys.hasNext() && !allCharsConsumed() && currentChar() != '/') {
128 if (currentChar() == ',') {
129 values.put(keys.next(), "");
134 // check if next value is parsable
135 checkValid(IDENTIFIER_PREDICATE.matches(currentChar()), ErrorTag.MALFORMED_MESSAGE,
136 "Value that starts with character %c is not parsable.", currentChar());
139 final QName key = keys.next();
140 Optional<DataSchemaNode> leafSchemaNode = listSchemaNode.findDataChildByName(key);
141 RestconfDocumentedException.throwIf(leafSchemaNode.isEmpty(), ErrorType.PROTOCOL, ErrorTag.BAD_ELEMENT,
142 "Schema not found for %s", key);
144 final String value = findAndParsePercentEncoded(nextIdentifierFromNextSequence(IDENTIFIER_PREDICATE));
145 final Object valueByType = prepareValueByType(leafSchemaNode.get(), value);
146 values.put(key, valueByType);
149 if (keys.hasNext() && !allCharsConsumed() && currentChar() == ',') {
154 // the last key is considered to be empty
155 if (keys.hasNext()) {
156 // at this point, it must be true that current char is '/' or all chars have already been consumed
157 values.put(keys.next(), "");
159 // there should be no more missing keys
160 RestconfDocumentedException.throwIf(keys.hasNext(), ErrorType.PROTOCOL, ErrorTag.MISSING_ATTRIBUTE,
161 "Cannot parse input identifier '%s'. Key value is missing for QName: %s", data, qname);
164 path.add(YangInstanceIdentifier.NodeIdentifierWithPredicates.of(qname, values.build()));
167 private Object prepareValueByType(final DataSchemaNode schemaNode, final String value) {
170 TypeDefinition<? extends TypeDefinition<?>> typedef;
171 if (schemaNode instanceof LeafListSchemaNode) {
172 typedef = ((LeafListSchemaNode) schemaNode).getType();
174 typedef = ((LeafSchemaNode) schemaNode).getType();
176 final TypeDefinition<?> baseType = RestUtil.resolveBaseTypeFrom(typedef);
177 if (baseType instanceof LeafrefTypeDefinition) {
178 typedef = SchemaInferenceStack.ofInstantiatedPath(schemaContext, schemaNode.getPath())
179 .resolveLeafref((LeafrefTypeDefinition) baseType);
181 decoded = RestCodec.from(typedef, null, schemaContext).deserialize(value);
182 if (decoded == null && typedef instanceof IdentityrefTypeDefinition) {
183 decoded = toIdentityrefQName(value, schemaNode);
188 private QName prepareQName() {
189 checkValidIdentifierStart();
190 final String preparedPrefix = nextIdentifierFromNextSequence(ParserConstants.YANG_IDENTIFIER_PART);
192 final String localName;
194 if (allCharsConsumed()) {
195 return getQNameOfDataSchemaNode(preparedPrefix);
198 switch (currentChar()) {
201 prefix = preparedPrefix;
202 return getQNameOfDataSchemaNode(prefix);
204 prefix = preparedPrefix;
206 checkValidIdentifierStart();
207 localName = nextIdentifierFromNextSequence(ParserConstants.YANG_IDENTIFIER_PART);
209 if (!allCharsConsumed() && currentChar() == '=') {
210 return getQNameOfDataSchemaNode(localName);
212 final Module module = moduleForPrefix(prefix);
213 RestconfDocumentedException.throwIf(module == null, ErrorType.PROTOCOL, ErrorTag.UNKNOWN_ELEMENT,
214 "Failed to lookup for module with name '%s'.", prefix);
215 return QName.create(module.getQNameModule(), localName);
218 throw getParsingCharFailedException();
222 private void prepareNodeWithValue(final QName qname, final List<PathArgument> path) {
224 final String value = nextIdentifierFromNextSequence(IDENTIFIER_PREDICATE);
226 // exception if value attribute is missing
227 RestconfDocumentedException.throwIf(value.isEmpty(), ErrorType.PROTOCOL, ErrorTag.MISSING_ATTRIBUTE,
228 "Cannot parse input identifier '%s' - value is missing for QName: %s.", data, qname);
229 final DataSchemaNode dataSchemaNode = current.getDataSchemaNode();
230 final Object valueByType = prepareValueByType(dataSchemaNode, findAndParsePercentEncoded(value));
231 path.add(new YangInstanceIdentifier.NodeWithValue<>(qname, valueByType));
234 private void prepareIdentifier(final QName qname, final List<PathArgument> path) {
235 final DataSchemaContextNode<?> currentNode = nextContextNode(qname, path);
236 if (currentNode != null) {
237 checkValid(!currentNode.isKeyedEntry(), ErrorTag.MISSING_ATTRIBUTE,
238 "Entry '%s' requires key or value predicate to be present.", qname);
242 @SuppressFBWarnings(value = "NP_NULL_ON_SOME_PATH",
243 justification = "code does check for null 'current' but FB doesn't recognize it")
244 private DataSchemaContextNode<?> nextContextNode(final QName qname, final List<PathArgument> path) {
245 final DataSchemaContextNode<?> initialContext = current;
246 final DataSchemaNode initialDataSchema = initialContext.getDataSchemaNode();
248 current = initialContext.getChild(qname);
250 if (current == null) {
251 final Optional<Module> module = schemaContext.findModule(qname.getModule());
252 if (module.isPresent()) {
253 for (final RpcDefinition rpcDefinition : module.get().getRpcs()) {
254 if (rpcDefinition.getQName().getLocalName().equals(qname.getLocalName())) {
259 if (findActionDefinition(initialDataSchema, qname.getLocalName()).isPresent()) {
263 checkValid(current != null, ErrorTag.MALFORMED_MESSAGE, "'%s' is not correct schema node identifier.", qname);
264 while (current.isMixin()) {
265 path.add(current.getIdentifier());
266 current = current.getChild(qname);
271 private Module moduleForPrefix(final String prefix) {
272 return schemaContext.findModules(prefix).stream().findFirst().orElse(null);
275 private boolean allCharsConsumed() {
276 return offset == data.length();
279 private void checkValid(final boolean condition, final ErrorTag errorTag, final String errorMsg) {
281 throw createParsingException(errorTag, errorMsg);
285 private void checkValid(final boolean condition, final ErrorTag errorTag, final String fmt, final Object arg) {
287 throw createParsingException(errorTag, String.format(fmt, arg));
291 private void checkValidIdentifierStart() {
292 checkValid(YangNames.IDENTIFIER_START.matches(currentChar()), ErrorTag.MALFORMED_MESSAGE,
293 "Identifier must start with character from set 'a-zA-Z_'");
296 private RestconfDocumentedException getParsingCharFailedException() {
297 return createParsingException(ErrorTag.MALFORMED_MESSAGE,
298 "Bad char '" + currentChar() + "' on the current position.");
301 private RestconfDocumentedException createParsingException(final ErrorTag errorTag, final String reason) {
302 return new RestconfDocumentedException(
303 "Could not parse Instance Identifier '" + data + "'. Offset: '" + offset + "' : Reason: " + reason,
304 ErrorType.PROTOCOL, errorTag);
307 private char currentChar() {
308 return data.charAt(offset);
311 private void skipCurrentChar() {
315 private String nextIdentifierFromNextSequence(final CharMatcher matcher) {
316 final int start = offset;
317 while (!allCharsConsumed() && matcher.matches(currentChar())) {
320 return data.substring(start, offset);
323 private void validArg() {
324 // every identifier except of the first MUST start with slash
326 checkValid('/' == currentChar(), ErrorTag.MALFORMED_MESSAGE, "Identifier must start with '/'.");
328 // skip consecutive slashes, users often assume restconf URLs behave just as HTTP does by squashing
329 // multiple slashes into a single one
330 while (!allCharsConsumed() && '/' == currentChar()) {
334 // check if slash is not also the last char in identifier
335 checkValid(!allCharsConsumed(), ErrorTag.MALFORMED_MESSAGE, "Identifier cannot end with '/'.");
339 private QName getQNameOfDataSchemaNode(final String nodeName) {
340 final DataSchemaNode dataSchemaNode = current.getDataSchemaNode();
341 if (dataSchemaNode instanceof ContainerLike) {
342 return getQNameOfDataSchemaNode((ContainerLike) dataSchemaNode, nodeName);
343 } else if (dataSchemaNode instanceof ListSchemaNode) {
344 return getQNameOfDataSchemaNode((ListSchemaNode) dataSchemaNode, nodeName);
347 throw new UnsupportedOperationException("Unsupported schema node " + dataSchemaNode);
350 private static <T extends DataNodeContainer & SchemaNode & ActionNodeContainer> QName getQNameOfDataSchemaNode(
351 final T parent, final String nodeName) {
352 final Optional<? extends ActionDefinition> actionDef = findActionDefinition(parent, nodeName);
353 final SchemaNode node;
354 if (actionDef.isPresent()) {
355 node = actionDef.get();
357 node = RestconfSchemaUtil.findSchemaNodeInCollection(parent.getChildNodes(), nodeName);
359 return node.getQName();
362 private static Optional<? extends ActionDefinition> findActionDefinition(final SchemaNode dataSchemaNode,
363 final String nodeName) {
364 requireNonNull(dataSchemaNode, "DataSchema Node must not be null.");
365 if (dataSchemaNode instanceof ActionNodeContainer) {
366 return ((ActionNodeContainer) dataSchemaNode).getActions().stream()
367 .filter(actionDef -> actionDef.getQName().getLocalName().equals(nodeName)).findFirst();
369 return Optional.empty();
372 private static String findAndParsePercentEncoded(final String preparedPrefix) {
373 if (preparedPrefix.indexOf('%') == -1) {
374 return preparedPrefix;
377 // FIXME: this is extremely inefficient: we should be converting ranges of characters, not driven by
378 // CharMatcher, but by String.indexOf()
379 final StringBuilder parsedPrefix = new StringBuilder(preparedPrefix);
380 while (PERCENT_ENCODING.matchesAnyOf(parsedPrefix)) {
381 final int percentCharPosition = PERCENT_ENCODING.indexIn(parsedPrefix);
382 parsedPrefix.replace(percentCharPosition, percentCharPosition + LAST_ENCODED_CHAR,
383 String.valueOf((char) Integer.parseInt(parsedPrefix.substring(
384 percentCharPosition + FIRST_ENCODED_CHAR, percentCharPosition + LAST_ENCODED_CHAR),
385 PERCENT_ENCODED_RADIX)));
388 return parsedPrefix.toString();
391 private QName toIdentityrefQName(final String value, final DataSchemaNode schemaNode) {
392 final String moduleName = toModuleName(value);
393 final String nodeName = toNodeName(value);
394 final Iterator<? extends Module> modulesIterator = schemaContext.findModules(moduleName).iterator();
395 if (!modulesIterator.hasNext()) {
396 throw new RestconfDocumentedException(String.format("Cannot decode value '%s' for identityref type "
397 + "in %s. Make sure reserved characters such as comma, single-quote, double-quote, colon,"
398 + " double-quote, space, and forward slash (,'\":\" /) are percent-encoded,"
399 + " for example ':' is '%%3A'", value, current.getIdentifier().getNodeType()),
400 ErrorType.PROTOCOL, ErrorTag.BAD_ELEMENT);
402 for (final IdentitySchemaNode identitySchemaNode : modulesIterator.next().getIdentities()) {
403 final QName qName = identitySchemaNode.getQName();
404 if (qName.getLocalName().equals(nodeName)) {
408 return QName.create(schemaNode.getQName().getNamespace(), schemaNode.getQName().getRevision(), nodeName);
411 private static String toNodeName(final String str) {
412 final int idx = str.indexOf(':');
417 if (str.indexOf(':', idx + 1) != -1) {
421 return str.substring(idx + 1);
424 private static String toModuleName(final String str) {
425 final int idx = str.indexOf(':');
430 if (str.indexOf(':', idx + 1) != -1) {
434 return str.substring(0, idx);