Line data Source code
1 : /*
2 : * Copyright (c) 2024 Project CHIP Authors
3 : * All rights reserved.
4 : *
5 : * Licensed under the Apache License, Version 2.0 (the "License");
6 : * you may not use this file except in compliance with the License.
7 : * You may obtain a copy of the License at
8 : *
9 : * http://www.apache.org/licenses/LICENSE-2.0
10 : *
11 : * Unless required by applicable law or agreed to in writing, software
12 : * distributed under the License is distributed on an "AS IS" BASIS,
13 : * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 : * See the License for the specific language governing permissions and
15 : * limitations under the License.
16 : */
17 : #include <data-model-providers/codegen/CodegenDataModelProvider.h>
18 :
19 : #include <access/AccessControl.h>
20 : #include <app-common/zap-generated/attribute-type.h>
21 : #include <app/AttributeAccessInterface.h>
22 : #include <app/AttributeAccessInterfaceRegistry.h>
23 : #include <app/ConcreteAttributePath.h>
24 : #include <app/GlobalAttributes.h>
25 : #include <app/RequiredPrivilege.h>
26 : #include <app/data-model/FabricScoped.h>
27 : #include <app/reporting/reporting.h>
28 : #include <app/util/af-types.h>
29 : #include <app/util/attribute-metadata.h>
30 : #include <app/util/attribute-storage-detail.h>
31 : #include <app/util/attribute-storage.h>
32 : #include <app/util/attribute-table-detail.h>
33 : #include <app/util/attribute-table.h>
34 : #include <app/util/ember-io-storage.h>
35 : #include <app/util/ember-strings.h>
36 : #include <data-model-providers/codegen/EmberAttributeDataBuffer.h>
37 : #include <lib/core/CHIPError.h>
38 : #include <lib/support/CodeUtils.h>
39 : #include <lib/support/odd-sized-integers.h>
40 :
41 : #include <zap-generated/endpoint_config.h>
42 :
43 : namespace chip {
44 : namespace app {
45 : namespace {
46 :
47 : using namespace chip::app::Compatibility::Internal;
48 : using Protocols::InteractionModel::Status;
49 :
50 : /// Attempts to write via an attribute access interface (AAI)
51 : ///
52 : /// If it returns a CHIP_ERROR, then this is a FINAL result (i.e. either failure or success)
53 : ///
54 : /// If it returns std::nullopt, then there is no AAI to handle the given path
55 : /// and processing should figure out the value otherwise (generally from other ember data)
56 5302 : std::optional<CHIP_ERROR> TryWriteViaAccessInterface(const ConcreteDataAttributePath & path, AttributeAccessInterface * aai,
57 : AttributeValueDecoder & decoder)
58 : {
59 : // Processing can happen only if an attribute access interface actually exists..
60 5302 : if (aai == nullptr)
61 : {
62 137 : return std::nullopt;
63 : }
64 :
65 5165 : CHIP_ERROR err = aai->Write(path, decoder);
66 :
67 10330 : if (err != CHIP_NO_ERROR)
68 : {
69 14 : return std::make_optional(err);
70 : }
71 :
72 : // If the decoder tried to decode, then a value should have been read for processing.
73 : // - if decoding was done, assume DONE (i.e. final CHIP_NO_ERROR)
74 : // - otherwise, if no decoding done, return that processing must continue via nullopt
75 10302 : return decoder.TriedDecode() ? std::make_optional(CHIP_NO_ERROR) : std::nullopt;
76 : }
77 :
78 : } // namespace
79 :
80 5306 : DataModel::ActionReturnStatus CodegenDataModelProvider::WriteAttribute(const DataModel::WriteAttributeRequest & request,
81 : AttributeValueDecoder & decoder)
82 : {
83 : // we must be started up to accept writes (we make use of the context below)
84 5306 : VerifyOrReturnError(mContext.has_value(), CHIP_ERROR_INCORRECT_STATE);
85 :
86 : const EmberAfAttributeMetadata * attributeMetadata =
87 5306 : emberAfLocateAttributeMetadata(request.path.mEndpointId, request.path.mClusterId, request.path.mAttributeId);
88 :
89 5306 : if (attributeMetadata != nullptr)
90 : {
91 : // AAI is only allowed on ember-attributes
92 : AttributeAccessInterface * aai =
93 5302 : AttributeAccessInterfaceRegistry::Instance().Get(request.path.mEndpointId, request.path.mClusterId);
94 5302 : std::optional<CHIP_ERROR> aai_result = TryWriteViaAccessInterface(request.path, aai, decoder);
95 5302 : if (aai_result.has_value())
96 : {
97 10322 : if (*aai_result == CHIP_NO_ERROR)
98 : {
99 : // AAI write was successful. We still need to bump the version and notify our listeners.
100 : // ember attribute changed will increase version and call back the global codegen provider (which should be `this`)
101 5147 : emberAfAttributeChanged(request.path.mEndpointId, request.path.mClusterId, request.path.mAttributeId);
102 : }
103 5161 : return *aai_result;
104 : }
105 : }
106 :
107 : // If ServerClusterInterface is available, it provides the final answer
108 145 : if (auto * cluster = mRegistry.Get(request.path); cluster != nullptr)
109 : {
110 5 : return cluster->WriteAttribute(request, decoder);
111 : }
112 :
113 : // WriteAttribute requirement is that request.path is a VALID path inside the provider
114 : // metadata tree. Clients are supposed to validate this (and data version and other flags)
115 : // This SHOULD NEVER HAPPEN hence the general return code (seemed preferable to VerifyOrDie)
116 140 : VerifyOrReturnError(attributeMetadata != nullptr, Status::Failure);
117 :
118 140 : MutableByteSpan dataBuffer = gEmberAttributeIOBufferSpan;
119 : {
120 140 : Ember::EmberAttributeDataBuffer emberData(attributeMetadata, dataBuffer);
121 140 : ReturnErrorOnFailure(decoder.Decode(emberData));
122 : }
123 :
124 : Protocols::InteractionModel::Status status;
125 :
126 116 : if (dataBuffer.size() > attributeMetadata->size)
127 : {
128 1 : ChipLogDetail(Zcl, "Data to write exceeds the attribute size claimed.");
129 1 : return Status::InvalidValue;
130 : }
131 :
132 115 : EmberAfWriteDataInput dataInput(dataBuffer.data(), attributeMetadata->attributeType);
133 :
134 : // TODO: dataInput.SetMarkDirty() should be according to `ChangesOmmited`
135 :
136 115 : if (request.subjectDescriptor.authMode == Access::AuthMode::kInternalDeviceAccess)
137 : {
138 : // Internal requests use the non-External interface that has less enforcement
139 : // than the external version (e.g. does not check/enforce writable settings, does not
140 : // validate attribute types) - see attribute-table.h documentation for details.
141 0 : status = emberAfWriteAttribute(request.path, dataInput);
142 : }
143 : else
144 : {
145 115 : status = emAfWriteAttributeExternal(request.path, dataInput);
146 : }
147 :
148 115 : if (status != Protocols::InteractionModel::Status::Success)
149 : {
150 2 : return status;
151 : }
152 :
153 113 : return CHIP_NO_ERROR;
154 : }
155 :
156 1879 : void CodegenDataModelProvider::ListAttributeWriteNotification(const ConcreteAttributePath & aPath,
157 : DataModel::ListWriteOperation opType, FabricIndex accessingFabric)
158 : {
159 : // NOTE: for backwards compatibility, we process AAI logic BEFORE Server Cluster Interface
160 : // so that AttributeAccessInterface logic works if one was installed before Server Cluster Interface
161 : // support was introduced in the SDK.
162 1879 : AttributeAccessInterface * aai = AttributeAccessInterfaceRegistry::Instance().Get(aPath.mEndpointId, aPath.mClusterId);
163 1879 : if (aai != nullptr)
164 : {
165 1874 : switch (opType)
166 : {
167 937 : case DataModel::ListWriteOperation::kListWriteBegin:
168 937 : aai->OnListWriteBegin(aPath);
169 937 : break;
170 12 : case DataModel::ListWriteOperation::kListWriteFailure:
171 12 : aai->OnListWriteEnd(aPath, false);
172 12 : break;
173 925 : case DataModel::ListWriteOperation::kListWriteSuccess:
174 925 : aai->OnListWriteEnd(aPath, true);
175 925 : break;
176 : }
177 :
178 : // We fall through here and will notify any ServerClusterInterface as well.
179 : // This is NOT ideal because AAI may or may not fully intercept the write,
180 : // So we do not know which of the ::Write behavior AAI uses:
181 : // - write succeeds (so SCI should not be notified)
182 : // - AAI falls-through (so SCI should process the request)
183 : //
184 : // for now we err on the side of notifying both.
185 : }
186 :
187 1879 : if (auto * cluster = mRegistry.Get(aPath); cluster != nullptr)
188 : {
189 0 : cluster->ListAttributeWriteNotification(aPath, opType, accessingFabric);
190 0 : return;
191 : }
192 : }
193 :
194 : } // namespace app
195 : } // namespace chip
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