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94 lines
3.0 KiB
94 lines
3.0 KiB
package sigcred
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import (
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"dehub.dev/src/dehub.git/fs"
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"dehub.dev/src/dehub.git/typeobj"
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)
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// Signifier reprsents a single signing method being defined in the Config. Only
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// one field should be set on each Signifier.
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type Signifier struct {
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PGPPublicKey *SignifierPGP `type:"pgp_public_key"`
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// PGPPublicKeyFile is deprecated, only PGPPublicKey should be used
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PGPPublicKeyFile *SignifierPGPFile `type:"pgp_public_key_file"`
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}
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// MarshalYAML implements the yaml.Marshaler interface.
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func (s Signifier) MarshalYAML() (interface{}, error) {
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return typeobj.MarshalYAML(s)
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}
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// UnmarshalYAML implements the yaml.Unmarshaler interface.
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func (s *Signifier) UnmarshalYAML(unmarshal func(interface{}) error) error {
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if err := typeobj.UnmarshalYAML(s, unmarshal); err != nil {
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return err
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}
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// TODO deprecate PGPPublicKeyFile
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if s.PGPPublicKeyFile != nil {
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s.PGPPublicKey = &SignifierPGP{Path: s.PGPPublicKeyFile.Path}
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s.PGPPublicKeyFile = nil
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}
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return nil
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}
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// Interface returns the SignifierInterface instance encapsulated by this
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// Signifier object.
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//
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// accountID is given so as to automatically fill the AccountID field of
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// Credentials returned from Sign, since the underlying implementation doesn't
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// know what account it's signing for.
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func (s Signifier) Interface(accountID string) (SignifierInterface, error) {
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el, _, err := typeobj.Element(s)
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if err != nil {
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return nil, err
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}
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return accountSignifier(accountID, el.(SignifierInterface)), nil
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}
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// SignifierInterface describes the methods that all Signifiers must implement.
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type SignifierInterface interface {
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// Sign returns a Credential containing a signature of the given data.
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//
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// tree can be used to find the Signifier at a particular snapshot.
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Sign(fs fs.FS, data []byte) (Credential, error)
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// Signed returns true if the Signifier was used to sign the Credential.
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Signed(fs fs.FS, cred Credential) (bool, error)
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// Verify asserts that the Signifier produced the given Credential for the
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// given data set, or returns an error.
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//
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// tree can be used to find the Signifier at a particular snapshot.
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Verify(fs fs.FS, data []byte, cred Credential) error
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}
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type signifierMiddleware struct {
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SignifierInterface
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signCallback func(*Credential)
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}
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func (sm signifierMiddleware) Sign(fs fs.FS, data []byte) (Credential, error) {
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cred, err := sm.SignifierInterface.Sign(fs, data)
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if err != nil || sm.signCallback == nil {
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return cred, err
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}
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sm.signCallback(&cred)
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return cred, nil
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}
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// accountSignifier wraps a SignifierInterface to always set the accountID field
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// on Credentials it produces via the Sign method.
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//
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// TODO accountSignifier shouldn't be necessary, it's very ugly. Which indicates
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// that Credential probably shouldn't have AccountID on it, which makes sense.
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// Some refactoring is required here.
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func accountSignifier(accountID string, sigInt SignifierInterface) SignifierInterface {
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return signifierMiddleware{
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SignifierInterface: sigInt,
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signCallback: func(cred *Credential) {
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cred.AccountID = accountID
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},
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}
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}
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