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.server.spi;
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.util.ArrayList;
16 import java.util.List;
17 import org.eclipse.jdt.annotation.NonNull;
18 import org.opendaylight.restconf.api.ApiPath;
19 import org.opendaylight.restconf.api.ApiPath.ListInstance;
20 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
21 import org.opendaylight.restconf.nb.rfc8040.Insert.PointNormalizer;
22 import org.opendaylight.restconf.server.api.DatabindContext;
23 import org.opendaylight.yangtools.yang.common.ErrorTag;
24 import org.opendaylight.yangtools.yang.common.ErrorType;
25 import org.opendaylight.yangtools.yang.common.QName;
26 import org.opendaylight.yangtools.yang.common.QNameModule;
27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
29 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
30 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeWithValue;
31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
32 import org.opendaylight.yangtools.yang.data.impl.codec.TypeDefinitionAwareCodec;
33 import org.opendaylight.yangtools.yang.data.util.DataSchemaContext;
34 import org.opendaylight.yangtools.yang.data.util.DataSchemaContext.PathMixin;
35 import org.opendaylight.yangtools.yang.model.api.ActionNodeContainer;
36 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
37 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
38 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
39 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
40 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
41 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
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 ApiPathNormalizer implements PointNormalizer {
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 modelContext) {
61 path = YangInstanceIdentifier.of();
62 stack = SchemaInferenceStack.of(modelContext);
63 node = requireNonNull(modelContext);
66 Result(final EffectiveModelContext modelContext, 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(modelContext);
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.of(steps);
78 this.stack = requireNonNull(stack);
79 this.node = requireNonNull(node);
83 private final @NonNull ApiPathInstanceIdentifierCodec instanceIdentifierCodec;
84 private final @NonNull EffectiveModelContext modelContext;
85 private final @NonNull DatabindContext databind;
87 public ApiPathNormalizer(final DatabindContext databind) {
88 this.databind = requireNonNull(databind);
89 modelContext = databind.modelContext();
90 instanceIdentifierCodec = new ApiPathInstanceIdentifierCodec(databind);
94 public PathArgument normalizePoint(final ApiPath value) {
95 return normalizePath(value).path.getLastPathArgument();
98 // FIXME: NETCONF-818: this method really needs to report an Inference and optionally a YangInstanceIdentifier
99 // - we need the inference for discerning the correct context
100 // - RPCs do not have a YangInstanceIdentifier
101 // - Actions always have a YangInstanceIdentifier, but it points to their parent
102 // - we need to discern the cases RPC invocation, Action invocation and data tree access quickly
104 // All of this really is an utter mess because we end up calling into this code from various places which,
105 // for example, should not allow RPCs to be valid targets
106 public @NonNull Result normalizePath(final ApiPath apiPath) {
107 final var it = apiPath.steps().iterator();
109 return new Result(modelContext);
112 // First step is somewhat special:
113 // - it has to contain a module qualifier
114 // - it has to consider RPCs, for which we need SchemaContext
116 // We therefore peel that first iteration here and not worry about those details in further iterations
117 var step = it.next();
118 final var firstModule = step.module();
119 if (firstModule == null) {
120 throw new RestconfDocumentedException(
121 "First member must use namespace-qualified form, '" + step.identifier() + "' does not",
122 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
125 var namespace = resolveNamespace(firstModule);
126 var qname = step.identifier().bindTo(namespace);
128 // We go through more modern APIs here to get this special out of the way quickly
129 final var optRpc = modelContext.findModuleStatement(namespace).orElseThrow()
130 .findSchemaTreeNode(RpcEffectiveStatement.class, qname);
131 if (optRpc.isPresent()) {
132 // We have found an RPC match,
134 throw new RestconfDocumentedException("First step in the path resolves to RPC '" + qname + "' and "
135 + "therefore it must be the only step present", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
137 if (step instanceof ListInstance) {
138 throw new RestconfDocumentedException("First step in the path resolves to RPC '" + qname + "' and "
139 + "therefore it must not contain key values", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
142 return new Result(modelContext, optRpc.orElseThrow().argument());
145 final var stack = SchemaInferenceStack.of(modelContext);
146 final var path = new ArrayList<PathArgument>();
147 final SchemaNode node;
149 DataSchemaContext parentNode = databind.schemaTree().getRoot();
151 final var parentSchema = parentNode.dataSchemaNode();
152 if (parentSchema instanceof ActionNodeContainer actionParent) {
153 final var optAction = actionParent.findAction(qname);
154 if (optAction.isPresent()) {
156 throw new RestconfDocumentedException("Request path resolves to action '" + qname + "' and "
157 + "therefore it must not continue past it", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
159 if (step instanceof ListInstance) {
160 throw new RestconfDocumentedException("Request path resolves to action '" + qname + "' and "
161 + "therefore it must not contain key values",
162 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
165 // Legacy behavior: Action's path should not include its path, but the rest of the code expects it
166 path.add(new NodeIdentifier(qname));
167 stack.enterSchemaTree(qname);
168 node = optAction.orElseThrow();
173 // Resolve the child step with respect to data schema tree
174 final var found = parentNode instanceof DataSchemaContext.Composite composite
175 ? composite.enterChild(stack, qname) : null;
177 throw new RestconfDocumentedException("Schema for '" + qname + "' not found",
178 ErrorType.PROTOCOL, ErrorTag.DATA_MISSING);
181 // Now add all mixins encountered to the path
182 var childNode = found;
183 while (childNode instanceof PathMixin currentMixin) {
184 path.add(currentMixin.mixinPathStep());
185 childNode = verifyNotNull(currentMixin.enterChild(stack, qname),
186 "Mixin %s is missing child for %s while resolving %s", childNode, qname, found);
189 final PathArgument pathArg;
190 if (step instanceof ListInstance listStep) {
191 final var values = listStep.keyValues();
192 final var schema = childNode.dataSchemaNode();
193 pathArg = schema instanceof ListSchemaNode listSchema
194 ? prepareNodeWithPredicates(stack, qname, listSchema, values)
195 : prepareNodeWithValue(stack, qname, schema, values);
197 if (childNode.dataSchemaNode() instanceof ListSchemaNode list && !list.getKeyDefinition().isEmpty()) {
198 throw new RestconfDocumentedException(
199 "Entry '" + qname + "' requires key or value predicate to be present.",
200 ErrorType.PROTOCOL, ErrorTag.MISSING_ATTRIBUTE);
202 pathArg = childNode.getPathStep();
208 node = childNode.dataSchemaNode();
212 parentNode = childNode;
214 final var module = step.module();
215 if (module != null) {
216 namespace = resolveNamespace(module);
219 qname = step.identifier().bindTo(namespace);
222 return new Result(path, stack, node);
225 private NodeIdentifierWithPredicates prepareNodeWithPredicates(final SchemaInferenceStack stack, final QName qname,
226 final @NonNull ListSchemaNode schema, final List<@NonNull String> keyValues) {
227 final var keyDef = schema.getKeyDefinition();
228 final var keySize = keyDef.size();
229 final var varSize = keyValues.size();
230 if (keySize != varSize) {
231 throw new RestconfDocumentedException(
232 "Schema for " + qname + " requires " + keySize + " key values, " + varSize + " supplied",
233 ErrorType.PROTOCOL, keySize > varSize ? ErrorTag.MISSING_ATTRIBUTE : ErrorTag.UNKNOWN_ATTRIBUTE);
236 final var values = ImmutableMap.<QName, Object>builderWithExpectedSize(keySize);
237 final var tmp = stack.copy();
238 for (int i = 0; i < keySize; ++i) {
239 final QName keyName = keyDef.get(i);
240 final var child = schema.getDataChildByName(keyName);
241 tmp.enterSchemaTree(keyName);
242 values.put(keyName, prepareValueByType(tmp, child, keyValues.get(i)));
246 return NodeIdentifierWithPredicates.of(qname, values.build());
249 private Object prepareValueByType(final SchemaInferenceStack stack, final DataSchemaNode schemaNode,
250 final @NonNull String value) {
252 TypeDefinition<? extends TypeDefinition<?>> typedef;
253 if (schemaNode instanceof LeafListSchemaNode leafList) {
254 typedef = leafList.getType();
256 typedef = ((LeafSchemaNode) schemaNode).getType();
258 if (typedef instanceof LeafrefTypeDefinition leafref) {
259 typedef = stack.resolveLeafref(leafref);
262 if (typedef instanceof IdentityrefTypeDefinition) {
263 return toIdentityrefQName(value, schemaNode);
267 if (typedef instanceof InstanceIdentifierTypeDefinition) {
268 return instanceIdentifierCodec.deserialize(value);
271 return verifyNotNull(TypeDefinitionAwareCodec.from(typedef),
272 "Unhandled type %s decoding %s", typedef, value).deserialize(value);
273 } catch (IllegalArgumentException e) {
274 throw new RestconfDocumentedException("Invalid value '" + value + "' for " + schemaNode.getQName(),
275 ErrorType.PROTOCOL, ErrorTag.INVALID_VALUE, e);
279 private NodeWithValue<?> prepareNodeWithValue(final SchemaInferenceStack stack, final QName qname,
280 final DataSchemaNode schema, final List<String> keyValues) {
281 // TODO: qname should be always equal to schema.getQName(), right?
282 return new NodeWithValue<>(qname, prepareValueByType(stack, schema,
283 // FIXME: ahem: we probably want to do something differently here
287 private QName toIdentityrefQName(final String value, final DataSchemaNode schemaNode) {
288 final QNameModule namespace;
289 final String localName;
290 final int firstColon = value.indexOf(':');
291 if (firstColon != -1) {
292 namespace = resolveNamespace(value.substring(0, firstColon));
293 localName = value.substring(firstColon + 1);
295 namespace = schemaNode.getQName().getModule();
299 return modelContext.getModuleStatement(namespace)
300 .streamEffectiveSubstatements(IdentityEffectiveStatement.class)
301 .map(IdentityEffectiveStatement::argument)
302 .filter(qname -> localName.equals(qname.getLocalName()))
304 .orElseThrow(() -> new RestconfDocumentedException(
305 "No identity found for '" + localName + "' in namespace " + namespace,
306 ErrorType.PROTOCOL, ErrorTag.INVALID_VALUE));
309 private @NonNull QNameModule resolveNamespace(final String moduleName) {
310 final var it = modelContext.findModuleStatements(moduleName).iterator();
312 return it.next().localQNameModule();
314 throw new RestconfDocumentedException("Failed to lookup for module with name '" + moduleName + "'.",
315 ErrorType.PROTOCOL, ErrorTag.UNKNOWN_ELEMENT);