mirror of
https://github.com/ceph/ceph-csi.git
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258 lines
10 KiB
Go
258 lines
10 KiB
Go
/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package common
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import (
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"time"
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"github.com/google/cel-go/cel"
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"github.com/google/cel-go/common/types"
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apiservercel "k8s.io/apiserver/pkg/cel"
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"k8s.io/kube-openapi/pkg/validation/spec"
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)
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const maxRequestSizeBytes = apiservercel.DefaultMaxRequestSizeBytes
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// SchemaDeclType converts the structural schema to a CEL declaration, or returns nil if the
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// structural schema should not be exposed in CEL expressions.
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// Set isResourceRoot to true for the root of a custom resource or embedded resource.
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//
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// Schemas with XPreserveUnknownFields not exposed unless they are objects. Array and "maps" schemas
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// are not exposed if their items or additionalProperties schemas are not exposed. Object Properties are not exposed
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// if their schema is not exposed.
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//
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// The CEL declaration for objects with XPreserveUnknownFields does not expose unknown fields.
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func SchemaDeclType(s Schema, isResourceRoot bool) *apiservercel.DeclType {
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if s == nil {
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return nil
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}
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if s.IsXIntOrString() {
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// schemas using XIntOrString are not required to have a type.
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// intOrStringType represents the x-kubernetes-int-or-string union type in CEL expressions.
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// In CEL, the type is represented as dynamic value, which can be thought of as a union type of all types.
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// All type checking for XIntOrString is deferred to runtime, so all access to values of this type must
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// be guarded with a type check, e.g.:
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//
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// To require that the string representation be a percentage:
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// `type(intOrStringField) == string && intOrStringField.matches(r'(\d+(\.\d+)?%)')`
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// To validate requirements on both the int and string representation:
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// `type(intOrStringField) == int ? intOrStringField < 5 : double(intOrStringField.replace('%', '')) < 0.5
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//
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dyn := apiservercel.NewSimpleTypeWithMinSize("dyn", cel.DynType, nil, 1) // smallest value for a serialized x-kubernetes-int-or-string is 0
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// handle x-kubernetes-int-or-string by returning the max length/min serialized size of the largest possible string
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dyn.MaxElements = maxRequestSizeBytes - 2
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return dyn
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}
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// We ignore XPreserveUnknownFields since we don't support validation rules on
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// data that we don't have schema information for.
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if isResourceRoot {
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// 'apiVersion', 'kind', 'metadata.name' and 'metadata.generateName' are always accessible to validator rules
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// at the root of resources, even if not specified in the schema.
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// This includes the root of a custom resource and the root of XEmbeddedResource objects.
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s = s.WithTypeAndObjectMeta()
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}
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switch s.Type() {
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case "array":
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if s.Items() != nil {
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itemsType := SchemaDeclType(s.Items(), s.Items().IsXEmbeddedResource())
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if itemsType == nil {
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return nil
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}
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var maxItems int64
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if s.MaxItems() != nil {
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maxItems = zeroIfNegative(*s.MaxItems())
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} else {
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maxItems = estimateMaxArrayItemsFromMinSize(itemsType.MinSerializedSize)
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}
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return apiservercel.NewListType(itemsType, maxItems)
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}
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return nil
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case "object":
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if s.AdditionalProperties() != nil && s.AdditionalProperties().Schema() != nil {
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propsType := SchemaDeclType(s.AdditionalProperties().Schema(), s.AdditionalProperties().Schema().IsXEmbeddedResource())
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if propsType != nil {
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var maxProperties int64
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if s.MaxProperties() != nil {
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maxProperties = zeroIfNegative(*s.MaxProperties())
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} else {
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maxProperties = estimateMaxAdditionalPropertiesFromMinSize(propsType.MinSerializedSize)
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}
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return apiservercel.NewMapType(apiservercel.StringType, propsType, maxProperties)
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}
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return nil
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}
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fields := make(map[string]*apiservercel.DeclField, len(s.Properties()))
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required := map[string]bool{}
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if s.Required() != nil {
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for _, f := range s.Required() {
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required[f] = true
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}
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}
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// an object will always be serialized at least as {}, so account for that
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minSerializedSize := int64(2)
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for name, prop := range s.Properties() {
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var enumValues []interface{}
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if prop.Enum() != nil {
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for _, e := range prop.Enum() {
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enumValues = append(enumValues, e)
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}
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}
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if fieldType := SchemaDeclType(prop, prop.IsXEmbeddedResource()); fieldType != nil {
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if propName, ok := apiservercel.Escape(name); ok {
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fields[propName] = apiservercel.NewDeclField(propName, fieldType, required[name], enumValues, prop.Default())
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}
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// the min serialized size for an object is 2 (for {}) plus the min size of all its required
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// properties
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// only include required properties without a default value; default values are filled in
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// server-side
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if required[name] && prop.Default() == nil {
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minSerializedSize += int64(len(name)) + fieldType.MinSerializedSize + 4
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}
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}
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}
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objType := apiservercel.NewObjectType("object", fields)
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objType.MinSerializedSize = minSerializedSize
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return objType
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case "string":
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switch s.Format() {
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case "byte":
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byteWithMaxLength := apiservercel.NewSimpleTypeWithMinSize("bytes", cel.BytesType, types.Bytes([]byte{}), apiservercel.MinStringSize)
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if s.MaxLength() != nil {
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byteWithMaxLength.MaxElements = zeroIfNegative(*s.MaxLength())
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} else {
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byteWithMaxLength.MaxElements = estimateMaxStringLengthPerRequest(s)
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}
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return byteWithMaxLength
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case "duration":
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durationWithMaxLength := apiservercel.NewSimpleTypeWithMinSize("duration", cel.DurationType, types.Duration{Duration: time.Duration(0)}, int64(apiservercel.MinDurationSizeJSON))
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durationWithMaxLength.MaxElements = estimateMaxStringLengthPerRequest(s)
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return durationWithMaxLength
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case "date":
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timestampWithMaxLength := apiservercel.NewSimpleTypeWithMinSize("timestamp", cel.TimestampType, types.Timestamp{Time: time.Time{}}, int64(apiservercel.JSONDateSize))
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timestampWithMaxLength.MaxElements = estimateMaxStringLengthPerRequest(s)
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return timestampWithMaxLength
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case "date-time":
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timestampWithMaxLength := apiservercel.NewSimpleTypeWithMinSize("timestamp", cel.TimestampType, types.Timestamp{Time: time.Time{}}, int64(apiservercel.MinDatetimeSizeJSON))
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timestampWithMaxLength.MaxElements = estimateMaxStringLengthPerRequest(s)
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return timestampWithMaxLength
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}
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strWithMaxLength := apiservercel.NewSimpleTypeWithMinSize("string", cel.StringType, types.String(""), apiservercel.MinStringSize)
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if s.MaxLength() != nil {
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// multiply the user-provided max length by 4 in the case of an otherwise-untyped string
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// we do this because the OpenAPIv3 spec indicates that maxLength is specified in runes/code points,
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// but we need to reason about length for things like request size, so we use bytes in this code (and an individual
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// unicode code point can be up to 4 bytes long)
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strWithMaxLength.MaxElements = zeroIfNegative(*s.MaxLength()) * 4
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} else {
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strWithMaxLength.MaxElements = estimateMaxStringLengthPerRequest(s)
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}
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return strWithMaxLength
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case "boolean":
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return apiservercel.BoolType
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case "number":
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return apiservercel.DoubleType
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case "integer":
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return apiservercel.IntType
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}
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return nil
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}
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func zeroIfNegative(v int64) int64 {
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if v < 0 {
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return 0
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}
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return v
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}
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// WithTypeAndObjectMeta ensures the kind, apiVersion and
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// metadata.name and metadata.generateName properties are specified, making a shallow copy of the provided schema if needed.
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func WithTypeAndObjectMeta(s *spec.Schema) *spec.Schema {
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if s.Properties != nil &&
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s.Properties["kind"].Type.Contains("string") &&
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s.Properties["apiVersion"].Type.Contains("string") &&
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s.Properties["metadata"].Type.Contains("object") &&
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s.Properties["metadata"].Properties != nil &&
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s.Properties["metadata"].Properties["name"].Type.Contains("string") &&
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s.Properties["metadata"].Properties["generateName"].Type.Contains("string") {
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return s
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}
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result := *s
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props := make(map[string]spec.Schema, len(s.Properties))
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for k, prop := range s.Properties {
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props[k] = prop
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}
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stringType := spec.StringProperty()
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props["kind"] = *stringType
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props["apiVersion"] = *stringType
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props["metadata"] = spec.Schema{
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SchemaProps: spec.SchemaProps{
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Type: []string{"object"},
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Properties: map[string]spec.Schema{
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"name": *stringType,
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"generateName": *stringType,
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},
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},
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}
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result.Properties = props
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return &result
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}
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// estimateMaxStringLengthPerRequest estimates the maximum string length (in characters)
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// of a string compatible with the format requirements in the provided schema.
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// must only be called on schemas of type "string" or x-kubernetes-int-or-string: true
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func estimateMaxStringLengthPerRequest(s Schema) int64 {
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if s.IsXIntOrString() {
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return maxRequestSizeBytes - 2
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}
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switch s.Format() {
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case "duration":
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return apiservercel.MaxDurationSizeJSON
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case "date":
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return apiservercel.JSONDateSize
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case "date-time":
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return apiservercel.MaxDatetimeSizeJSON
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default:
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// subtract 2 to account for ""
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return maxRequestSizeBytes - 2
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}
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}
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// estimateMaxArrayItemsPerRequest estimates the maximum number of array items with
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// the provided minimum serialized size that can fit into a single request.
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func estimateMaxArrayItemsFromMinSize(minSize int64) int64 {
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// subtract 2 to account for [ and ]
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return (maxRequestSizeBytes - 2) / (minSize + 1)
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}
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// estimateMaxAdditionalPropertiesPerRequest estimates the maximum number of additional properties
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// with the provided minimum serialized size that can fit into a single request.
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func estimateMaxAdditionalPropertiesFromMinSize(minSize int64) int64 {
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// 2 bytes for key + "" + colon + comma + smallest possible value, realistically the actual keys
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// will all vary in length
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keyValuePairSize := minSize + 6
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// subtract 2 to account for { and }
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return (maxRequestSizeBytes - 2) / keyValuePairSize
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}
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