mirror of https://github.com/knative/pkg.git
122 lines
3.9 KiB
Go
122 lines
3.9 KiB
Go
/*
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Copyright 2019 The Knative 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 v1
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import (
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"context"
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"crypto/x509"
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"encoding/pem"
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"knative.dev/pkg/apis"
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)
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// Destination represents a target of an invocation over HTTP.
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type Destination struct {
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// Ref points to an Addressable.
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// +optional
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Ref *KReference `json:"ref,omitempty"`
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// URI can be an absolute URL(non-empty scheme and non-empty host) pointing to the target or a relative URI. Relative URIs will be resolved using the base URI retrieved from Ref.
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// +optional
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URI *apis.URL `json:"uri,omitempty"`
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// CACerts are Certification Authority (CA) certificates in PEM format
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// according to https://www.rfc-editor.org/rfc/rfc7468.
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// If set, these CAs are appended to the set of CAs provided
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// by the Addressable target, if any.
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// +optional
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CACerts *string `json:"CACerts,omitempty"`
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// Audience is the OIDC audience.
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// This need only be set, if the target is not an Addressable
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// and thus the Audience can't be received from the Addressable itself.
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// In case the Addressable specifies an Audience too, the Destinations
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// Audience takes preference.
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// +optional
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Audience *string `json:"audience,omitempty"`
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}
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// Validate the Destination has all the necessary fields and check the
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// Namespace matches that of the parent object (using apis.ParentMeta).
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func (d *Destination) Validate(ctx context.Context) *apis.FieldError {
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if d == nil {
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return nil
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}
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return ValidateDestination(ctx, *d).ViaField(apis.CurrentField)
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}
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// ValidateDestination validates Destination.
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func ValidateDestination(ctx context.Context, dest Destination) *apis.FieldError {
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ref := dest.Ref
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uri := dest.URI
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caCerts := dest.CACerts
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if ref == nil && uri == nil {
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return apis.ErrGeneric("expected at least one, got none", "ref", "uri")
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}
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if ref != nil && uri != nil && uri.URL().IsAbs() {
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return apis.ErrGeneric("Absolute URI is not allowed when Ref or [apiVersion, kind, name] is present", "[apiVersion, kind, name]", "ref", "uri")
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}
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// IsAbs() check whether the URL has a non-empty scheme. Besides the non-empty scheme, we also require uri has a non-empty host
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if ref == nil && uri != nil && (!uri.URL().IsAbs() || uri.Host == "") {
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return apis.ErrInvalidValue("Relative URI is not allowed when Ref and [apiVersion, kind, name] is absent", "uri")
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}
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if ref != nil && uri == nil {
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return ref.Validate(ctx).ViaField("ref")
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}
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if caCerts != nil {
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return validateCACerts(caCerts)
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}
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return nil
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}
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// GetRef gets the KReference from this Destination, if one is present. If no ref is present,
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// then nil is returned.
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func (d *Destination) GetRef() *KReference {
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if d == nil {
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return nil
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}
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return d.Ref
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}
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func (d *Destination) SetDefaults(ctx context.Context) {
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if d == nil {
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return
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}
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if d.Ref != nil && d.Ref.Namespace == "" {
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d.Ref.Namespace = apis.ParentMeta(ctx).Namespace
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}
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}
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func validateCACerts(caCert *string) *apis.FieldError {
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// Check the object.
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var errs *apis.FieldError
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block, err := pem.Decode([]byte(*caCert))
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if err != nil && block == nil {
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errs = errs.Also(apis.ErrInvalidValue("CA Cert provided is invalid", "caCert"))
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return errs
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}
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if block.Type != "CERTIFICATE" {
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errs = errs.Also(apis.ErrInvalidValue("CA Cert provided is not a certificate", "caCert"))
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} else if _, err := x509.ParseCertificate(block.Bytes); err != nil {
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errs = errs.Also(apis.ErrInvalidValue("CA Cert provided is invalid", "caCert"))
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}
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return errs
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}
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