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resolver.go
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resolver.go
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package key
import (
"fmt"
"github.com/Comcast/webpa-common/resource"
)
// Resolver loads and parses keys associated with key identifiers.
type Resolver interface {
// ResolveKey returns a key Pair associated with the given identifier. The exact mechanics of resolving
// a keyId into a Pair are implementation-specific. Implementations are free
// to ignore the keyId parameter altogether.
ResolveKey(keyId string) (Pair, error)
}
// basicResolver contains common items for all resolvers.
type basicResolver struct {
parser Parser
purpose Purpose
}
func (b *basicResolver) parseKey(data []byte) (Pair, error) {
return b.parser.ParseKey(b.purpose, data)
}
// singleResolver is a Resolver which expects only (1) key for all key ids.
type singleResolver struct {
basicResolver
loader resource.Loader
}
func (r *singleResolver) String() string {
return fmt.Sprintf(
"singleResolver{parser: %v, purpose: %v, loader: %v}",
r.parser,
r.purpose,
r.loader,
)
}
func (r *singleResolver) ResolveKey(keyId string) (Pair, error) {
data, err := resource.ReadAll(r.loader)
if err != nil {
return nil, err
}
return r.parseKey(data)
}
// multiResolver is a Resolver which uses the key id and will most likely return
// different keys for each key id value.
type multiResolver struct {
basicResolver
expander resource.Expander
}
func (r *multiResolver) String() string {
return fmt.Sprintf(
"multiResolver{parser: %v, purpose: %v, expander: %v}",
r.parser,
r.purpose,
r.expander,
)
}
func (r *multiResolver) ResolveKey(keyId string) (Pair, error) {
values := map[string]interface{}{
KeyIdParameterName: keyId,
}
loader, err := r.expander.Expand(values)
if err != nil {
return nil, err
}
data, err := resource.ReadAll(loader)
if err != nil {
return nil, err
}
return r.parseKey(data)
}