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mapping.go
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mapping.go
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package iam
import (
"errors"
"fmt"
)
var (
// ErrNeitherUserNorRole is the error returned when an identity is missing both UserARN
// and RoleARN.
ErrNeitherUserNorRole = errors.New("arn is neither user nor role")
// ErrNoKubernetesIdentity is the error returned when an identity has neither a Kubernetes
// username nor a list of groups.
ErrNoKubernetesIdentity = errors.New("neither username nor group are set for iam identity")
)
// Identity represents an IAM identity and its corresponding Kubernetes identity
type Identity interface {
ARN() string
Type() string
Username() string
Groups() []string
}
// KubernetesIdentity represents a kubernetes identity to be used in iam mappings
type KubernetesIdentity struct {
KubernetesUsername string `json:"username,omitempty"`
KubernetesGroups []string `json:"groups,omitempty"`
}
// UserIdentity represents a mapping from an IAM user to a kubernetes identity
type UserIdentity struct {
UserARN string `json:"userarn,omitempty"`
KubernetesIdentity
}
// RoleIdentity represents a mapping from an IAM role to a kubernetes identity
type RoleIdentity struct {
RoleARN string `json:"rolearn,omitempty"`
KubernetesIdentity
}
// Username returns the Kubernetes username
func (k KubernetesIdentity) Username() string {
return k.KubernetesUsername
}
// Groups returns the Kubernetes groups
func (k KubernetesIdentity) Groups() []string {
return k.KubernetesGroups
}
// ARN returns the ARN of the iam mapping
func (u UserIdentity) ARN() string {
return u.UserARN
}
// Type returns the resource type of the iam mapping
func (u UserIdentity) Type() string {
return ResourceTypeUser
}
// ARN returns the ARN of the iam mapping
func (r RoleIdentity) ARN() string {
return r.RoleARN
}
// Type returns the resource type of the iam mapping
func (r RoleIdentity) Type() string {
return ResourceTypeRole
}
// NewIdentity determines into which field the given arn goes and returns the new identity
// alongside any error resulting for checking its validity.
func NewIdentity(arn string, username string, groups []string) (Identity, error) {
if arn == "" {
return nil, fmt.Errorf("expected a valid arn but got empty string")
}
if username == "" && len(groups) == 0 {
return nil, ErrNoKubernetesIdentity
}
parsedARN, err := Parse(arn)
if err != nil {
return nil, err
}
switch {
case parsedARN.IsUser():
return &UserIdentity{
UserARN: arn,
KubernetesIdentity: KubernetesIdentity{
KubernetesUsername: username,
KubernetesGroups: groups,
},
}, nil
case parsedARN.IsRole():
return &RoleIdentity{
RoleARN: arn,
KubernetesIdentity: KubernetesIdentity{
KubernetesUsername: username,
KubernetesGroups: groups,
},
}, nil
default:
return nil, ErrNeitherUserNorRole
}
}