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errors.go
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errors.go
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package validation
import (
"encoding/json"
"fmt"
)
// VALIDATION ERRORS
// ErrValidation represents a general validation error
type ErrValidation struct {
Msg string
}
func (err ErrValidation) Error() string {
return fmt.Sprintf("An error occurred during validation: %s", err.Msg)
}
// ErrBadHierarchy represents missing metadata. Currently: a missing snapshot
// at this current time. When delegations are implemented it will also
// represent a missing delegation parent
type ErrBadHierarchy struct {
Missing string
Msg string
}
func (err ErrBadHierarchy) Error() string {
return fmt.Sprintf("Metadata hierarchy is incomplete: %s", err.Msg)
}
// ErrBadRoot represents a failure validating the root
type ErrBadRoot struct {
Msg string
}
func (err ErrBadRoot) Error() string {
return fmt.Sprintf("The root metadata is invalid: %s", err.Msg)
}
// ErrBadTargets represents a failure to validate a targets (incl delegations)
type ErrBadTargets struct {
Msg string
}
func (err ErrBadTargets) Error() string {
return fmt.Sprintf("The targets metadata is invalid: %s", err.Msg)
}
// ErrBadSnapshot represents a failure to validate the snapshot
type ErrBadSnapshot struct {
Msg string
}
func (err ErrBadSnapshot) Error() string {
return fmt.Sprintf("The snapshot metadata is invalid: %s", err.Msg)
}
// END VALIDATION ERRORS
// SerializableError is a struct that can be used to serialize an error as JSON
type SerializableError struct {
Name string
Error error
}
// UnmarshalJSON attempts to unmarshal the error into the right type
func (s *SerializableError) UnmarshalJSON(text []byte) (err error) {
var x struct{ Name string }
err = json.Unmarshal(text, &x)
if err != nil {
return
}
var theError error
switch x.Name {
case "ErrValidation":
var e struct{ Error ErrValidation }
err = json.Unmarshal(text, &e)
theError = e.Error
case "ErrBadHierarchy":
var e struct{ Error ErrBadHierarchy }
err = json.Unmarshal(text, &e)
theError = e.Error
case "ErrBadRoot":
var e struct{ Error ErrBadRoot }
err = json.Unmarshal(text, &e)
theError = e.Error
case "ErrBadTargets":
var e struct{ Error ErrBadTargets }
err = json.Unmarshal(text, &e)
theError = e.Error
case "ErrBadSnapshot":
var e struct{ Error ErrBadSnapshot }
err = json.Unmarshal(text, &e)
theError = e.Error
default:
err = fmt.Errorf("do not know how to unmarshal %s", x.Name)
return
}
if err != nil {
return
}
s.Name = x.Name
s.Error = theError
return nil
}
// NewSerializableError serializes one of the above errors into JSON
func NewSerializableError(err error) (*SerializableError, error) {
// make sure it's one of our errors
var name string
switch err.(type) {
case ErrValidation:
name = "ErrValidation"
case ErrBadHierarchy:
name = "ErrBadHierarchy"
case ErrBadRoot:
name = "ErrBadRoot"
case ErrBadTargets:
name = "ErrBadTargets"
case ErrBadSnapshot:
name = "ErrBadSnapshot"
default:
return nil, fmt.Errorf("does not support serializing non-validation errors")
}
return &SerializableError{Name: name, Error: err}, nil
}