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middleware.go
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middleware.go
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/*
Copyright SecureKey Technologies Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package rfc0593
import (
"errors"
"fmt"
"github.com/hyperledger/aries-framework-go/pkg/didcomm/protocol/decorator"
"github.com/hyperledger/aries-framework-go/pkg/didcomm/protocol/issuecredential"
"github.com/hyperledger/aries-framework-go/spi/storage"
)
// Middleware is the RFC0593 issuecredential.Middleware that can be injected into the protocol service.
type Middleware issuecredential.Middleware
// RegisterMiddleware registers the Middleware in the IssueCredentialService looked up from the ServiceProvider.
//
// See also: NewMiddleware.
func RegisterMiddleware(mw Middleware, p ServiceProvider) error {
typelessSvc, err := p.Service(issuecredential.Name)
if err != nil {
return fmt.Errorf("failed to lookup issuecredential service: %w", err)
}
svc, ok := typelessSvc.(IssueCredentialService)
if !ok {
return errors.New("unable to cast the issuecredential service to the required interface type")
}
svc.AddMiddleware(issuecredential.Middleware(mw))
return nil
}
// NewMiddleware returns a new Middleware that can be used with the issuecredential protocol service
// in conjunction with AutoExecute when the protocol needs to be started with a request-credential
// message.
//
// Usage:
// framework, err := aries.New()
// if err != nil {
// panic(err)
// }
// ctx, err := framework.Context()
// if err != nil {
// panic(err)
// }
// mw, err := NewMiddleware(ctx)
// if err != nil {
// panic(err)
// }
// err = RegisterMiddleware(mw, ctx)
// if err != nil {
// panic(err)
// }
// client := issuecredential.Client = ...
// events = make(chan service.DIDCommAction)
// err := client.RegisterActionEvent(events)
// if err != nil {
// panic(err)
// }
// next := make(chan service.DIDCommAction)
// go AutoExecute(ctx, next)(events)
// for event := range next {
// // handle events from issue-credential that do not conform to RFC0593
// }
//
// See also: AutoExecute.
func NewMiddleware(p TransientStorage) (Middleware, error) {
s, err := p.ProtocolStateStorageProvider().OpenStore(StoreName)
if err != nil {
return nil, fmt.Errorf("rfc0593: failed to open store: %w", err)
}
return func(next issuecredential.Handler) issuecredential.Handler {
return &handler{
next: next,
store: s,
}
}, nil
}
type handler struct {
next issuecredential.Handler
store storage.Store
}
// Handle the issuecredential.Metadata.
func (h *handler) Handle(md issuecredential.Metadata) error {
var (
formats []issuecredential.Format
attachments []decorator.Attachment
err error
)
switch md.Message().Type() {
case issuecredential.RequestCredentialMsgTypeV2:
p := &issuecredential.RequestCredentialV2{}
err = md.Message().Decode(p)
formats = p.Formats
attachments = p.RequestsAttach
default:
return h.next.Handle(md)
}
if err != nil {
return fmt.Errorf("rfc0593: failed to decode msg type %s: %w", md.Message().Type(), err)
}
attachment, err := FindAttachment(ProofVCDetailFormat, formats, attachments)
if errors.Is(err, ErrRFC0593NotApplicable) {
return h.next.Handle(md)
}
if err != nil {
return fmt.Errorf("rfc0593: failed to fetch attachment: %w", err)
}
spec := &CredentialSpec{}
err = unmarshalAttachmentContents(attachment, spec)
if err != nil {
return fmt.Errorf("rfc0593: failed to unmarshal attachment contents: %w", err)
}
err = saveOptionsIfNoError(nil, h.store, md.Message(), spec.Options)
if err != nil {
return fmt.Errorf("rfc0593: failed to save credential spec options: %w", err)
}
return h.next.Handle(md)
}