build(backend): introduce generated OpenFGA code

Add OpenFGA implementation.

The code is generated following the same process included with the new just task
"compile-protobuf".

Every time there is a change in https://github.com/openfga/api/tree/main/openfga/v1,
we should make sure to check the generated code is up to date. In this case, the
commit used was `f153694`.

Signed-off-by: Damiano Mason <damiano.mason@secomind.com>

Author: Dam-99

backend/.gitignore

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2021-2023 SECO Mind Srl
+# SPDX-FileCopyrightText: 2021-2026 SECO Mind Srl
 # SPDX-License-Identifier: CC0-1.0
 
 # The directory Mix will write compiled artifacts to.
@@ -37,3 +37,9 @@ edgehog-*.tar
 
 # Ignore expert lsp files
 /.expert
+
+# ProtoBuf compilation dependencies
+/priv/api/
+/priv/googleapis/
+/priv/grpc-gateway/
+/priv/protoc-gen-validate/

backend/lib/openfga/v1/authzmodel.pb.ex

@@ -0,0 +1,326 @@
+# This file is part of Edgehog.
+#
+# Copyright 2026 SECO Mind Srl
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+defmodule Openfga.V1.ConditionParamTypeRef.TypeName do
+  use Protobuf,
+    enum: true,
+    full_name: "openfga.v1.ConditionParamTypeRef.TypeName",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :TYPE_NAME_UNSPECIFIED, 0
+  field :TYPE_NAME_ANY, 1
+  field :TYPE_NAME_BOOL, 2
+  field :TYPE_NAME_STRING, 3
+  field :TYPE_NAME_INT, 4
+  field :TYPE_NAME_UINT, 5
+  field :TYPE_NAME_DOUBLE, 6
+  field :TYPE_NAME_DURATION, 7
+  field :TYPE_NAME_TIMESTAMP, 8
+  field :TYPE_NAME_MAP, 9
+  field :TYPE_NAME_LIST, 10
+  field :TYPE_NAME_IPADDRESS, 11
+end
+
+defmodule Openfga.V1.AuthorizationModel.ConditionsEntry do
+  use Protobuf,
+    full_name: "openfga.v1.AuthorizationModel.ConditionsEntry",
+    map: true,
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :key, 1, type: :string
+  field :value, 2, type: Openfga.V1.Condition
+end
+
+defmodule Openfga.V1.AuthorizationModel do
+  use Protobuf,
+    full_name: "openfga.v1.AuthorizationModel",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :id, 1, type: :string, deprecated: false
+  field :schema_version, 2, type: :string, deprecated: false
+  field :type_definitions, 3, repeated: true, type: Openfga.V1.TypeDefinition, deprecated: false
+
+  field :conditions, 4,
+    repeated: true,
+    type: Openfga.V1.AuthorizationModel.ConditionsEntry,
+    map: true,
+    deprecated: false
+end
+
+defmodule Openfga.V1.TypeDefinition.RelationsEntry do
+  use Protobuf,
+    full_name: "openfga.v1.TypeDefinition.RelationsEntry",
+    map: true,
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :key, 1, type: :string
+  field :value, 2, type: Openfga.V1.Userset
+end
+
+defmodule Openfga.V1.TypeDefinition do
+  use Protobuf,
+    full_name: "openfga.v1.TypeDefinition",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :type, 1, type: :string, deprecated: false
+
+  field :relations, 2,
+    repeated: true,
+    type: Openfga.V1.TypeDefinition.RelationsEntry,
+    map: true,
+    deprecated: false
+
+  field :metadata, 3, type: Openfga.V1.Metadata
+end
+
+defmodule Openfga.V1.Relation do
+  use Protobuf,
+    full_name: "openfga.v1.Relation",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :name, 1, type: :string, deprecated: false
+  field :rewrite, 2, type: Openfga.V1.Userset, deprecated: false
+  field :type_info, 3, type: Openfga.V1.RelationTypeInfo, json_name: "typeInfo"
+end
+
+defmodule Openfga.V1.RelationTypeInfo do
+  use Protobuf,
+    full_name: "openfga.v1.RelationTypeInfo",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :directly_related_user_types, 1, repeated: true, type: Openfga.V1.RelationReference
+end
+
+defmodule Openfga.V1.Metadata.RelationsEntry do
+  use Protobuf,
+    full_name: "openfga.v1.Metadata.RelationsEntry",
+    map: true,
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :key, 1, type: :string
+  field :value, 2, type: Openfga.V1.RelationMetadata
+end
+
+defmodule Openfga.V1.Metadata do
+  use Protobuf,
+    full_name: "openfga.v1.Metadata",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :relations, 1, repeated: true, type: Openfga.V1.Metadata.RelationsEntry, map: true
+  field :module, 2, type: :string, deprecated: false
+  field :source_info, 3, type: Openfga.V1.SourceInfo
+end
+
+defmodule Openfga.V1.SourceInfo do
+  use Protobuf,
+    full_name: "openfga.v1.SourceInfo",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :file, 1, type: :string, deprecated: false
+end
+
+defmodule Openfga.V1.RelationMetadata do
+  use Protobuf,
+    full_name: "openfga.v1.RelationMetadata",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :directly_related_user_types, 1, repeated: true, type: Openfga.V1.RelationReference
+  field :module, 2, type: :string, deprecated: false
+  field :source_info, 3, type: Openfga.V1.SourceInfo
+end
+
+defmodule Openfga.V1.RelationReference do
+  @moduledoc """
+  RelationReference represents a relation of a particular object type (e.g. 'document#viewer').
+  """
+
+  use Protobuf,
+    full_name: "openfga.v1.RelationReference",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  oneof(:relation_or_wildcard, 0)
+
+  field :type, 1, type: :string, deprecated: false
+  field :relation, 2, type: :string, oneof: 0, deprecated: false
+  field :wildcard, 3, type: Openfga.V1.Wildcard, oneof: 0
+  field :condition, 4, type: :string, deprecated: false
+end
+
+defmodule Openfga.V1.Wildcard do
+  use Protobuf,
+    full_name: "openfga.v1.Wildcard",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+end
+
+defmodule Openfga.V1.Usersets do
+  use Protobuf,
+    full_name: "openfga.v1.Usersets",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :child, 1, repeated: true, type: Openfga.V1.Userset, deprecated: false
+end
+
+defmodule Openfga.V1.Difference do
+  use Protobuf,
+    full_name: "openfga.v1.Difference",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :base, 1, type: Openfga.V1.Userset, deprecated: false
+  field :subtract, 2, type: Openfga.V1.Userset, deprecated: false
+end
+
+defmodule Openfga.V1.Userset do
+  use Protobuf,
+    full_name: "openfga.v1.Userset",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  oneof(:userset, 0)
+
+  field :this, 1, type: Openfga.V1.DirectUserset, oneof: 0
+
+  field :computed_userset, 2,
+    type: Openfga.V1.ObjectRelation,
+    json_name: "computedUserset",
+    oneof: 0
+
+  field :tuple_to_userset, 3,
+    type: Openfga.V1.TupleToUserset,
+    json_name: "tupleToUserset",
+    oneof: 0
+
+  field :union, 4, type: Openfga.V1.Usersets, oneof: 0
+  field :intersection, 5, type: Openfga.V1.Usersets, oneof: 0
+  field :difference, 6, type: Openfga.V1.Difference, oneof: 0
+end
+
+defmodule Openfga.V1.DirectUserset do
+  @moduledoc """
+  A DirectUserset is a sentinel message for referencing
+  the direct members specified by an object/relation mapping.
+  """
+
+  use Protobuf,
+    full_name: "openfga.v1.DirectUserset",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+end
+
+defmodule Openfga.V1.ObjectRelation do
+  use Protobuf,
+    full_name: "openfga.v1.ObjectRelation",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :object, 1, type: :string, deprecated: false
+  field :relation, 2, type: :string, deprecated: false
+end
+
+defmodule Openfga.V1.ComputedUserset do
+  use Protobuf,
+    full_name: "openfga.v1.ComputedUserset",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :relation, 1, type: :string, deprecated: false
+end
+
+defmodule Openfga.V1.TupleToUserset do
+  use Protobuf,
+    full_name: "openfga.v1.TupleToUserset",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :tupleset, 1, type: Openfga.V1.ObjectRelation, deprecated: false
+
+  field :computed_userset, 2,
+    type: Openfga.V1.ObjectRelation,
+    json_name: "computedUserset",
+    deprecated: false
+end
+
+defmodule Openfga.V1.Condition.ParametersEntry do
+  use Protobuf,
+    full_name: "openfga.v1.Condition.ParametersEntry",
+    map: true,
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :key, 1, type: :string
+  field :value, 2, type: Openfga.V1.ConditionParamTypeRef
+end
+
+defmodule Openfga.V1.Condition do
+  use Protobuf,
+    full_name: "openfga.v1.Condition",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :name, 1, type: :string, deprecated: false
+  field :expression, 2, type: :string, deprecated: false
+
+  field :parameters, 3,
+    repeated: true,
+    type: Openfga.V1.Condition.ParametersEntry,
+    map: true,
+    deprecated: false
+
+  field :metadata, 4, type: Openfga.V1.ConditionMetadata
+end
+
+defmodule Openfga.V1.ConditionMetadata do
+  use Protobuf,
+    full_name: "openfga.v1.ConditionMetadata",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :module, 1, type: :string, deprecated: false
+  field :source_info, 2, type: Openfga.V1.SourceInfo
+end
+
+defmodule Openfga.V1.ConditionParamTypeRef do
+  use Protobuf,
+    full_name: "openfga.v1.ConditionParamTypeRef",
+    protoc_gen_elixir_version: "0.16.0",
+    syntax: :proto3
+
+  field :type_name, 1,
+    type: Openfga.V1.ConditionParamTypeRef.TypeName,
+    enum: true,
+    deprecated: false
+
+  field :generic_types, 2,
+    repeated: true,
+    type: Openfga.V1.ConditionParamTypeRef,
+    deprecated: false
+end