// Copyright Istio Authors
//
//   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.
// Modified by Higress Authors

syntax = "proto3";

import "google/protobuf/wrappers.proto";
import "google/protobuf/struct.proto";

// $schema: higress.extensions.v1alpha1.WasmPlugin
// $title: WasmPlugin
// $description: Extend the functionality provided by the envoy through WebAssembly filters.

package higress.extensions.v1alpha1;

option go_package="github.com/alibaba/higress/api/extensions/v1alpha1";

// <!-- crd generation tags
// +cue-gen:WasmPlugin:groupName:extensions.higress.io
// +cue-gen:WasmPlugin:version:v1alpha1
// +cue-gen:WasmPlugin:storageVersion
// +cue-gen:WasmPlugin:annotations:helm.sh/resource-policy=keep
// +cue-gen:WasmPlugin:subresource:status
// +cue-gen:WasmPlugin:scope:Namespaced
// +cue-gen:WasmPlugin:resource:categories=higress-io,extensions-higress-io
// +cue-gen:WasmPlugin:preserveUnknownFields:pluginConfig,defaultConfig,matchRules.[].config
// +cue-gen:WasmPlugin:printerColumn:name=Age,type=date,JSONPath=.metadata.creationTimestamp,description="CreationTimestamp is a timestamp
// representing the server time when this object was created. It is not guaranteed to be set in happens-before order across separate operations.
// Clients may not set this value. It is represented in RFC3339 form and is in UTC.
// Populated by the system. Read-only. Null for lists. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata"
// -->
//
// <!-- go code generation tags
// +kubetype-gen
// +kubetype-gen:groupVersion=extensions.higress.io/v1alpha1
// +genclient
// +k8s:deepcopy-gen=true
// -->
message WasmPlugin {
  // URL of a Wasm module or OCI container. If no scheme is present,
  // defaults to `oci://`, referencing an OCI image. Other valid schemes
  // are `file://` for referencing .wasm module files present locally
  // within the proxy container, and `http[s]://` for .wasm module files
  // hosted remotely.
  string url = 2;

  // SHA256 checksum that will be used to verify Wasm module or OCI container.
  // If the `url` field already references a SHA256 (using the `@sha256:`
  // notation), it must match the value of this field. If an OCI image is
  // referenced by tag and this field is set, its checksum will be verified
  // against the contents of this field after pulling.
  string sha256 = 3;

  // The pull behaviour to be applied when fetching an OCI image. Only
  // relevant when images are referenced by tag instead of SHA. Defaults
  // to IfNotPresent, except when an OCI image is referenced in the `url`
  // and the `latest` tag is used, in which case `Always` is the default,
  // mirroring K8s behaviour.
  // Setting is ignored if `url` field is referencing a Wasm module directly
  // using `file://` or `http[s]://`
  PullPolicy image_pull_policy = 4;

  // Credentials to use for OCI image pulling.
  // Name of a K8s Secret in the same namespace as the `WasmPlugin` that
  // contains a docker pull secret which is to be used to authenticate
  // against the registry when pulling the image.
  string image_pull_secret = 5;

  // Public key that will be used to verify signatures of signed OCI images
  // or Wasm modules. Must be supplied in PEM format.
  string verification_key = 6;

  // The configuration that will be passed on to the plugin.
  google.protobuf.Struct plugin_config = 7;

  // The plugin name to be used in the Envoy configuration (used to be called
  // `rootID`). Some .wasm modules might require this value to select the Wasm
  // plugin to execute.
  string plugin_name = 8;

  // Determines where in the filter chain this `WasmPlugin` is to be injected.
  PluginPhase phase = 9;

  // Determines ordering of `WasmPlugins` in the same `phase`.
  // When multiple `WasmPlugins` are applied to the same workload in the
  // same `phase`, they will be applied by priority, in descending order.
  // If `priority` is not set, or two `WasmPlugins` exist with the same
  // value, the ordering will be deterministically derived from name and
  // namespace of the `WasmPlugins`. Defaults to `0`.
  google.protobuf.Int32Value priority = 10;

  // Specifies the failure behavior for the plugin due to fatal errors.
  FailStrategy fail_strategy = 13;

  // Configuration for a Wasm VM.
  // more details can be found [here](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/wasm/v3/wasm.proto#extensions-wasm-v3-vmconfig).
  VmConfig vm_config = 11;

  // Extended by Higress, the default configuration takes effect globally
  google.protobuf.Struct default_config = 101;
  // Extended by Higress, matching rules take effect
  repeated MatchRule match_rules = 102;
  // disable the default config
  bool default_config_disable = 103;
}

// Extended by Higress
message MatchRule {
  repeated string ingress = 1;
  repeated string domain = 2;
  google.protobuf.Struct config = 3;
  bool config_disable = 4;
  repeated string service = 5;
}

// The phase in the filter chain where the plugin will be injected.
enum PluginPhase {
  // Control plane decides where to insert the plugin. This will generally
  // be at the end of the filter chain, right before the Router.
  // Do not specify `PluginPhase` if the plugin is independent of others.
  UNSPECIFIED_PHASE = 0;

  // Insert plugin before Istio authentication filters.
  AUTHN = 1;

  // Insert plugin before Istio authorization filters and after Istio authentication filters.
  AUTHZ = 2;

  // Insert plugin before Istio stats filters and after Istio authorization filters.
  STATS = 3;
}

// The pull behaviour to be applied when fetching an OCI image,
// mirroring K8s behaviour.
//
// <!--
// buf:lint:ignore ENUM_VALUE_UPPER_SNAKE_CASE
// -->
enum PullPolicy {
  // Defaults to IfNotPresent, except for OCI images with tag `latest`, for which
  // the default will be Always.
  UNSPECIFIED_POLICY = 0;

  // If an existing version of the image has been pulled before, that
  // will be used. If no version of the image is present locally, we
  // will pull the latest version.
  IfNotPresent = 1;

  // We will always pull the latest version of an image when applying
  // this plugin.
  Always = 2;
}

// Configuration for a Wasm VM.
// more details can be found [here](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/wasm/v3/wasm.proto#extensions-wasm-v3-vmconfig).
message VmConfig {
  // Specifies environment variables to be injected to this VM.
  // Note that if a key does not exist, it will be ignored.
  repeated EnvVar env = 1;
}

message EnvVar {
  // Required
  // Name of the environment variable. Must be a C_IDENTIFIER.
  string name = 1;

  // Required
  // Source for the environment variable's value.
  EnvValueSource value_from = 3;

  // Value for the environment variable.
  // Note that if `value_from` is `HOST`, it will be ignored.
  // Defaults to "".
  string value = 2;
}

enum EnvValueSource {
  // Explicitly given key-value pairs to be injected to this VM
  INLINE = 0;

  // *Istio-proxy's* environment variables exposed to this VM.
  HOST = 1;
}

enum FailStrategy {
  // A fatal error in the binary fetching or during the plugin execution causes
  // all subsequent requests to fail with 5xx.
  FAIL_CLOSE = 0;

  // Enables the fail open behavior for the Wasm plugin fatal errors to bypass
  // the plugin execution. A fatal error can be a failure to fetch the remote
  // binary, an exception, or abort() on the VM. This flag is not recommended
  // for the authentication or the authorization plugins.
  FAIL_OPEN = 1;
}