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 com.google.common.base.Verify.verify;
11 import static com.google.common.base.Verify.verifyNotNull;
12 import static java.util.Objects.requireNonNull;
14 import com.google.common.collect.ImmutableMap;
15 import java.text.ParseException;
16 import java.util.ArrayList;
17 import java.util.List;
18 import org.eclipse.jdt.annotation.NonNull;
19 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
20 import org.opendaylight.restconf.common.util.RestUtil;
21 import org.opendaylight.restconf.nb.rfc8040.ApiPath;
22 import org.opendaylight.restconf.nb.rfc8040.ApiPath.ListInstance;
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.QNameModule;
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.NodeIdentifierWithPredicates;
31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeWithValue;
32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
33 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
34 import org.opendaylight.yangtools.yang.model.api.ActionNodeContainer;
35 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
36 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
37 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
38 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
39 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
40 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
41 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
42 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
43 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
44 import org.opendaylight.yangtools.yang.model.api.stmt.IdentityEffectiveStatement;
45 import org.opendaylight.yangtools.yang.model.api.stmt.RpcEffectiveStatement;
46 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
47 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
48 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
49 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack;
52 * Deserializer for {@link String} to {@link YangInstanceIdentifier} for restconf.
54 public final class YangInstanceIdentifierDeserializer {
55 public static final class Result {
56 public final @NonNull YangInstanceIdentifier path;
57 public final @NonNull SchemaInferenceStack stack;
58 public final @NonNull SchemaNode node;
60 Result(final EffectiveModelContext context) {
61 path = YangInstanceIdentifier.empty();
62 node = requireNonNull(context);
63 stack = SchemaInferenceStack.of(context);
66 Result(final EffectiveModelContext context, final QName qname) {
67 // Legacy behavior: RPCs do not really have a YangInstanceIdentifier, but the rest of the code expects it
68 path = YangInstanceIdentifier.of(qname);
69 stack = SchemaInferenceStack.of(context);
71 final var stmt = stack.enterSchemaTree(qname);
72 verify(stmt instanceof RpcDefinition, "Unexpected statement %s", stmt);
73 node = (RpcDefinition) stmt;
76 Result(final List<PathArgument> steps, final SchemaInferenceStack stack, final SchemaNode node) {
77 path = YangInstanceIdentifier.create(steps);
78 this.stack = requireNonNull(stack);
79 this.node = requireNonNull(node);
83 private final @NonNull EffectiveModelContext schemaContext;
84 private final @NonNull ApiPath apiPath;
86 private YangInstanceIdentifierDeserializer(final EffectiveModelContext schemaContext, final ApiPath apiPath) {
87 this.schemaContext = requireNonNull(schemaContext);
88 this.apiPath = requireNonNull(apiPath);
92 * Method to create {@link List} from {@link PathArgument} which are parsing from data by {@link SchemaContext}.
94 * @param schemaContext for validate of parsing path arguments
95 * @param data path to data, in URL string form
96 * @return {@link Iterable} of {@link PathArgument}
97 * @throws RestconfDocumentedException the path is not valid
99 public static Result create(final EffectiveModelContext schemaContext, final String data) {
102 path = ApiPath.parse(requireNonNull(data));
103 } catch (ParseException e) {
104 throw new RestconfDocumentedException("Invalid path '" + data + "' at offset " + e.getErrorOffset(),
105 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE, e);
107 return create(schemaContext, path);
110 public static Result create(final EffectiveModelContext schemaContext, final ApiPath path) {
111 return new YangInstanceIdentifierDeserializer(schemaContext, path).parse();
114 // FIXME: NETCONF-818: this method really needs to report an Inference and optionally a YangInstanceIdentifier
115 // - we need the inference for discerning the correct context
116 // - RPCs do not have a YangInstanceIdentifier
117 // - Actions always have a YangInstanceIdentifier, but it points to their parent
118 // - we need to discern the cases RPC invocation, Action invocation and data tree access quickly
120 // All of this really is an utter mess because we end up calling into this code from various places which,
121 // for example, should not allow RPCs to be valid targets
122 private Result parse() {
123 final var it = apiPath.steps().iterator();
125 return new Result(schemaContext);
128 // First step is somewhat special:
129 // - it has to contain a module qualifier
130 // - it has to consider RPCs, for which we need SchemaContext
132 // We therefore peel that first iteration here and not worry about those details in further iterations
133 var step = it.next();
134 final var firstModule = RestconfDocumentedException.throwIfNull(step.module(),
135 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE,
136 "First member must use namespace-qualified form, '%s' does not", step.identifier());
137 var namespace = resolveNamespace(firstModule);
138 var qname = step.identifier().bindTo(namespace);
140 // We go through more modern APIs here to get this special out of the way quickly
141 final var optRpc = schemaContext.findModuleStatement(namespace).orElseThrow()
142 .findSchemaTreeNode(RpcEffectiveStatement.class, qname);
143 if (optRpc.isPresent()) {
144 // We have found an RPC match,
146 throw new RestconfDocumentedException("First step in the path resolves to RPC '" + qname + "' and "
147 + "therefore it must be the only step present", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
149 if (step instanceof ListInstance) {
150 throw new RestconfDocumentedException("First step in the path resolves to RPC '" + qname + "' and "
151 + "therefore it must not contain key values", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
154 return new Result(schemaContext, optRpc.orElseThrow().argument());
157 final var stack = SchemaInferenceStack.of(schemaContext);
158 final var path = new ArrayList<PathArgument>();
159 final SchemaNode node;
161 var parentNode = DataSchemaContextTree.from(schemaContext).getRoot();
163 final var parentSchema = parentNode.getDataSchemaNode();
164 if (parentSchema instanceof ActionNodeContainer) {
165 final var optAction = ((ActionNodeContainer) parentSchema).findAction(qname);
166 if (optAction.isPresent()) {
168 throw new RestconfDocumentedException("Request path resolves to action '" + qname + "' and "
169 + "therefore it must not continue past it", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
171 if (step instanceof ListInstance) {
172 throw new RestconfDocumentedException("Request path resolves to action '" + qname + "' and "
173 + "therefore it must not contain key values",
174 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
177 // Legacy behavior: Action's path should not include its path, but the rest of the code expects it
178 path.add(new NodeIdentifier(qname));
179 stack.enterSchemaTree(qname);
180 node = optAction.orElseThrow();
185 // Resolve the child step with respect to data schema tree
186 final var found = RestconfDocumentedException.throwIfNull(parentNode.enterChild(stack, qname),
187 ErrorType.PROTOCOL, ErrorTag.DATA_MISSING, "Schema for '%s' not found", qname);
189 // Now add all mixins encountered to the path
190 var childNode = found;
191 while (childNode.isMixin()) {
192 path.add(childNode.getIdentifier());
193 childNode = verifyNotNull(childNode.enterChild(stack, qname),
194 "Mixin %s is missing child for %s while resolving %s", childNode, qname, found);
197 final PathArgument pathArg;
198 if (step instanceof ListInstance) {
199 final var values = ((ListInstance) step).keyValues();
200 final var schema = childNode.getDataSchemaNode();
201 pathArg = schema instanceof ListSchemaNode
202 ? prepareNodeWithPredicates(stack, qname, (ListSchemaNode) schema, values)
203 : prepareNodeWithValue(stack, qname, schema, values);
205 RestconfDocumentedException.throwIf(childNode.isKeyedEntry(),
206 ErrorType.PROTOCOL, ErrorTag.MISSING_ATTRIBUTE,
207 "Entry '%s' requires key or value predicate to be present.", qname);
208 pathArg = childNode.getIdentifier();
214 node = childNode.getDataSchemaNode();
218 parentNode = childNode;
220 final var module = step.module();
221 if (module != null) {
222 namespace = resolveNamespace(module);
225 qname = step.identifier().bindTo(namespace);
228 return new Result(path, stack, node);
231 private NodeIdentifierWithPredicates prepareNodeWithPredicates(final SchemaInferenceStack stack, final QName qname,
232 final @NonNull ListSchemaNode schema, final List<@NonNull String> keyValues) {
233 final var keyDef = schema.getKeyDefinition();
234 final var keySize = keyDef.size();
235 final var varSize = keyValues.size();
236 if (keySize != varSize) {
237 throw new RestconfDocumentedException(
238 "Schema for " + qname + " requires " + keySize + " key values, " + varSize + " supplied",
239 ErrorType.PROTOCOL, keySize > varSize ? ErrorTag.MISSING_ATTRIBUTE : ErrorTag.UNKNOWN_ATTRIBUTE);
242 final var values = ImmutableMap.<QName, Object>builderWithExpectedSize(keySize);
243 final var tmp = stack.copy();
244 for (int i = 0; i < keySize; ++i) {
245 final QName keyName = keyDef.get(i);
246 final var child = schema.getDataChildByName(keyName);
247 tmp.enterSchemaTree(keyName);
248 values.put(keyName, prepareValueByType(tmp, child, keyValues.get(i)));
252 return NodeIdentifierWithPredicates.of(qname, values.build());
255 private Object prepareValueByType(final SchemaInferenceStack stack, final DataSchemaNode schemaNode,
256 final @NonNull String value) {
258 TypeDefinition<? extends TypeDefinition<?>> typedef;
259 if (schemaNode instanceof LeafListSchemaNode) {
260 typedef = ((LeafListSchemaNode) schemaNode).getType();
262 typedef = ((LeafSchemaNode) schemaNode).getType();
264 final TypeDefinition<?> baseType = RestUtil.resolveBaseTypeFrom(typedef);
265 if (baseType instanceof LeafrefTypeDefinition) {
266 typedef = stack.resolveLeafref((LeafrefTypeDefinition) baseType);
269 if (typedef instanceof IdentityrefTypeDefinition) {
270 return toIdentityrefQName(value, schemaNode);
274 if (typedef instanceof InstanceIdentifierTypeDefinition) {
275 return new StringModuleInstanceIdentifierCodec(schemaContext).deserialize(value);
278 return RestCodec.deserialize(schemaContext, typedef, value);
279 } catch (IllegalArgumentException e) {
280 throw new RestconfDocumentedException("Invalid value '" + value + "' for " + schemaNode.getQName(),
281 ErrorType.PROTOCOL, ErrorTag.INVALID_VALUE, e);
285 private NodeWithValue<?> prepareNodeWithValue(final SchemaInferenceStack stack, final QName qname,
286 final DataSchemaNode schema, final List<String> keyValues) {
287 // TODO: qname should be always equal to schema.getQName(), right?
288 return new NodeWithValue<>(qname, prepareValueByType(stack, schema,
289 // FIXME: ahem: we probably want to do something differently here
293 private QName toIdentityrefQName(final String value, final DataSchemaNode schemaNode) {
294 final QNameModule namespace;
295 final String localName;
296 final int firstColon = value.indexOf(':');
297 if (firstColon != -1) {
298 namespace = resolveNamespace(value.substring(0, firstColon));
299 localName = value.substring(firstColon + 1);
301 namespace = schemaNode.getQName().getModule();
305 return schemaContext.getModuleStatement(namespace)
306 .streamEffectiveSubstatements(IdentityEffectiveStatement.class)
307 .map(IdentityEffectiveStatement::argument)
308 .filter(qname -> localName.equals(qname.getLocalName()))
310 .orElseThrow(() -> new RestconfDocumentedException(
311 "No identity found for '" + localName + "' in namespace " + namespace,
312 ErrorType.PROTOCOL, ErrorTag.INVALID_VALUE));
315 private @NonNull QNameModule resolveNamespace(final String moduleName) {
316 final var modules = schemaContext.findModules(moduleName);
317 RestconfDocumentedException.throwIf(modules.isEmpty(), ErrorType.PROTOCOL, ErrorTag.UNKNOWN_ELEMENT,
318 "Failed to lookup for module with name '%s'.", moduleName);
319 return modules.iterator().next().getQNameModule();