90 lines
1.9 KiB
Go
90 lines
1.9 KiB
Go
package delegation
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import (
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"fmt"
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"time"
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"github.com/ipld/go-ipld-prime/datamodel"
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"github.com/ucan-wg/go-ucan/capability/command"
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"github.com/ucan-wg/go-ucan/capability/policy"
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"github.com/ucan-wg/go-ucan/did"
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)
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type View struct {
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// Issuer DID (sender)
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Issuer did.DID
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// Audience DID (receiver)
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Audience did.DID
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// Principal that the chain is about (the Subject)
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Subject did.DID
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// The Command to eventually invoke
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Command *command.Command
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// The delegation policy
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Policy policy.Policy
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// A unique, random nonce
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Nonce []byte
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// Arbitrary Metadata
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Meta map[string]datamodel.Node
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// "Not before" UTC Unix Timestamp in seconds (valid from), 53-bits integer
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NotBefore *time.Time
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// The timestamp at which the Invocation becomes invalid
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Expiration *time.Time
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}
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// ViewFromModel build a decoded view of the raw IPLD data.
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// This function also serves as validation.
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func ViewFromModel(m PayloadModel) (*View, error) {
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var view View
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var err error
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view.Issuer, err = did.Parse(m.Iss)
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if err != nil {
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return nil, fmt.Errorf("parse iss: %w", err)
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}
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view.Audience, err = did.Parse(m.Aud)
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if err != nil {
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return nil, fmt.Errorf("parse audience: %w", err)
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}
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if m.Sub != nil {
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view.Subject, err = did.Parse(*m.Sub)
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if err != nil {
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return nil, fmt.Errorf("parse subject: %w", err)
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}
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} else {
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view.Subject = did.Undef
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}
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view.Command, err = command.Parse(m.Cmd)
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if err != nil {
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return nil, fmt.Errorf("parse command: %w", err)
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}
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view.Policy, err = policy.FromIPLD(m.Pol)
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if err != nil {
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return nil, fmt.Errorf("parse policy: %w", err)
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}
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if len(m.Nonce) == 0 {
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return nil, fmt.Errorf("nonce is required")
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}
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view.Nonce = m.Nonce
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// TODO: copy?
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view.Meta = m.Meta.Values
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if m.Nbf != nil {
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t := time.Unix(*m.Nbf, 0)
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view.NotBefore = &t
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}
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if m.Exp != nil {
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t := time.Unix(*m.Exp, 0)
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view.Expiration = &t
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}
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return &view, nil
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}
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