asserts

package
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 Go to latest Published: May 14, 2016 License: GPL-3.0 Imports: 25 Imported by: 0

Documentation

Overview

Package asserts implements snappy assertions and a database abstraction for managing and holding them.

Index

Constants

View Source 
const (
	MaxBodySize      = 2 * 1024 * 1024
	MaxHeadersSize   = 128 * 1024
	MaxSignatureSize = 128 * 1024
)

Maximum assertion component sizes.

View Source 
const MediaType = "application/x.ubuntu.assertion"

MediaType is the media type for enconded assertions on the wire.

Variables

View Source 
var (
	AccountKeyType      = &AssertionType{"account-key", []string{"account-id", "public-key-id"}, assembleAccountKey}
	DeviceSerialType    = &AssertionType{"device-serial", []string{"brand-id", "model", "serial"}, assembleDeviceSerial}
	IdentityType        = &AssertionType{"identity", []string{"account-id"}, assembleIdentity}
	ModelType           = &AssertionType{"model", []string{"series", "brand-id", "model"}, assembleModel}
	SnapDeclarationType = &AssertionType{"snap-declaration", []string{"series", "snap-id"}, assembleSnapDeclaration}
	SnapBuildType       = &AssertionType{"snap-build", []string{"series", "snap-id", "snap-digest"}, assembleSnapBuild}
	SnapRevisionType    = &AssertionType{"snap-revision", []string{"series", "snap-id", "snap-digest"}, assembleSnapRevision}
)

Understood assertion types.

View Source 
var DefaultCheckers = []Checker{
	CheckSigningKeyIsNotExpired,
	CheckSignature,
	CheckTimestampVsSigningKeyValidity,
	CheckCrossConsistency,
}

DefaultCheckers lists the default and recommended assertion checkers used by Database if none are specified in the DatabaseConfig.Checkers.

View Source 
var (
	ErrNotFound = errors.New("assertion not found")
)

Well-known errors

Functions

func CheckCrossConsistency 

func CheckCrossConsistency(assert Assertion, signature Signature, signingKey *AccountKey, roDB RODatabase, checkTime time.Time) error

CheckCrossConsistency verifies that the assertion is consistent with the other statements in the database.

func CheckSignature 

func CheckSignature(assert Assertion, signature Signature, signingKey *AccountKey, roDB RODatabase, checkTime time.Time) error

CheckSignature checks that the signature is valid.

func CheckSigningKeyIsNotExpired 

func CheckSigningKeyIsNotExpired(assert Assertion, signature Signature, signingKey *AccountKey, roDB RODatabase, checkTime time.Time) error

CheckSigningKeyIsNotExpired checks that the signing key is not expired.

func CheckTimestampVsSigningKeyValidity 

func CheckTimestampVsSigningKeyValidity(assert Assertion, signature Signature, signingKey *AccountKey, roDB RODatabase, checkTime time.Time) error

CheckTimestampVsSigningKeyValidity verifies that the timestamp of the assertion is within the signing key validity.

func Encode 

func Encode(assert Assertion) []byte

Encode serializes an assertion.

func EncodeDigest 

func EncodeDigest(hash crypto.Hash, hashDigest []byte) (string, error)

EncodeDigest encodes a hash algorithm and a digest to be put in an assertion header.

func EncodePublicKey 

func EncodePublicKey(pubKey PublicKey) ([]byte, error)

EncodePublicKey serializes a public key, typically for embedding in an assertion.

Types

type AccountKey 

type AccountKey struct {
	// contains filtered or unexported fields
}

AccountKey holds an account-key assertion, asserting a public key belonging to the account.

func (*AccountKey) AccountID 

func (ak *AccountKey) AccountID() string

AccountID returns the account-id of this account-key.

func (*AccountKey) AuthorityID 

func (ab *AccountKey) AuthorityID() string

AuthorityID returns the authority-id a.k.a the signer id of the assertion.

func (*AccountKey) Body 

func (ab *AccountKey) Body() []byte

Body returns the body of the assertion.

func (*AccountKey) Header 

func (ab *AccountKey) Header(name string) string

Header returns the value of an header by name.

func (*AccountKey) Headers 

func (ab *AccountKey) Headers() map[string]string

Headers returns the complete headers.

func (*AccountKey) PublicKeyFingerprint 

func (ak *AccountKey) PublicKeyFingerprint() string

PublicKeyFingerprint returns the fingerprint of the account key.

func (*AccountKey) PublicKeyID 

func (ak *AccountKey) PublicKeyID() string

PublicKeyID returns the key id (as used to match signatures to signing keys) for the account key.

func (*AccountKey) Revision 

func (ab *AccountKey) Revision() int

Revision returns the assertion revision.

func (*AccountKey) Signature 

func (ab *AccountKey) Signature() (content, signature []byte)

Signature returns the signed content and its unprocessed signature.

func (*AccountKey) Since 

func (ak *AccountKey) Since() time.Time

Since returns the time when the account key starts being valid.

func (*AccountKey) Type 

func (ab *AccountKey) Type() *AssertionType

Type returns the assertion type.

func (*AccountKey) Until 

func (ak *AccountKey) Until() time.Time

Until returns the time when the account key stops being valid.

type Assertion 

type Assertion interface {
	// Type returns the type of this assertion
	Type() *AssertionType
	// Revision returns the revision of this assertion
	Revision() int
	// AuthorityID returns the authority that signed this assertion
	AuthorityID() string

	// Header retrieves the header with name
	Header(name string) string

	// Headers returns the complete headers
	Headers() map[string]string

	// Body returns the body of this assertion
	Body() []byte

	// Signature returns the signed content and its unprocessed signature
	Signature() (content, signature []byte)
}

Assertion represents an assertion through its general elements.

func Assemble 

func Assemble(headers map[string]string, body, content, signature []byte) (Assertion, error)

Assemble assembles an assertion from its components.

func Decode 

func Decode(serializedAssertion []byte) (Assertion, error)

Decode parses a serialized assertion.

The expected serialisation format looks like: 

HEADER ("\n\n" BODY?)? "\n\n" SIGNATURE

where: 

HEADER is a set of header entries separated by "\n"
BODY can be arbitrary,
SIGNATURE is the signature

A header entry for a single line value (no "\n" in it) looks like: 

NAME ": " VALUE

A header entry for a multiline value (a value with "\n"s in it) looks like: 

NAME ":\n"  1-space indented VALUE

The following headers are mandatory: 

type
authority-id (the signer id)

The following headers expect integer values and if omitted otherwise are assumed to be 0: 

revision (a positive int)
body-length (expected to be equal to the length of BODY)

type AssertionType 

type AssertionType struct {
	// Name of the type.
	Name string
	// PrimaryKey holds the names of the headers that constitute the
	// unique primary key for this assertion type.
	PrimaryKey []string
	// contains filtered or unexported fields
}

AssertionType describes a known assertion type with its name and metadata.

func Type 

func Type(name string) *AssertionType

Type returns the AssertionType with name or nil

type Backstore 

type Backstore interface {
	// Put stores an assertion.
	// It is responsible for checking that assert is newer than a
	// previously stored revision with the same primary key headers.
	Put(assertType *AssertionType, assert Assertion) error
	// Get returns the assertion with the given unique key for its primary key headers.
	// If none is present it returns ErrNotFound.
	Get(assertType *AssertionType, key []string) (Assertion, error)
	// Search returns assertions matching the given headers.
	// It invokes foundCb for each found assertion.
	Search(assertType *AssertionType, headers map[string]string, foundCb func(Assertion)) error
}

A Backstore stores assertions. It can store and retrieve assertions by type under unique primary key headers (whose names are available from assertType.PrimaryKey). Plus it supports searching by headers.

func NewMemoryBackstore 

func NewMemoryBackstore() Backstore

NewMemoryBackstore creates a memory backed assertions backstore.

func OpenFSBackstore 

func OpenFSBackstore(path string) (Backstore, error)

OpenFSBackstore opens a filesystem backed assertions backstore under path.

type Checker 

type Checker func(assert Assertion, signature Signature, signingKey *AccountKey, roDB RODatabase, checkTime time.Time) error

A Checker defines a check on an assertion considering aspects such as its signature, the signing key, and consistency with other assertions in the database.

type Database 

type Database struct {
	// contains filtered or unexported fields
}

Database holds assertions and can be used to sign or check further assertions.

func OpenDatabase 

func OpenDatabase(cfg *DatabaseConfig) (*Database, error)

OpenDatabase opens the assertion database based on the configuration.

func OpenSysDatabase 

func OpenSysDatabase(trustedAccountKey string) (*Database, error)

OpenSysDatabase opens the installation-wide assertion database. Uses the given trusted account key.

func (*Database) Add 

func (db *Database) Add(assert Assertion) error

Add persists the assertion after ensuring it is properly signed and consistent with all the stored knowledge. It will return an error when trying to add an older revision of the assertion than the one currently stored.

func (*Database) Check 

func (db *Database) Check(assert Assertion) error

Check tests whether the assertion is properly signed and consistent with all the stored knowledge.

func (*Database) Find 

func (db *Database) Find(assertionType *AssertionType, headers map[string]string) (Assertion, error)

Find an assertion based on arbitrary headers. Provided headers must contain the primary key for the assertion type. It returns ErrNotFound if the assertion cannot be found.

func (*Database) FindMany 

func (db *Database) FindMany(assertionType *AssertionType, headers map[string]string) ([]Assertion, error)

FindMany finds assertions based on arbitrary headers. It returns ErrNotFound if no assertion can be found.

func (*Database) GenerateKey 

func (db *Database) GenerateKey(authorityID string) (keyID string, err error)

GenerateKey generates a private/public key pair for identity and stores it returning its key id.

func (*Database) ImportKey 

func (db *Database) ImportKey(authorityID string, privKey PrivateKey) error

ImportKey stores the given private/public key pair for identity.

func (*Database) PublicKey 

func (db *Database) PublicKey(authorityID string, keyID string) (PublicKey, error)

PublicKey returns the public key owned by authorityID that has the given key id.

func (*Database) Sign 

func (db *Database) Sign(assertType *AssertionType, headers map[string]string, body []byte, keyID string) (Assertion, error)

Sign assembles an assertion with the provided information and signs it with the private key from `headers["authority-id"]` that has the provided key id.

type DatabaseConfig 

type DatabaseConfig struct {
	// trusted account keys
	TrustedKeys []*AccountKey
	// backstore for assertions, left unset storing assertions will error
	Backstore Backstore
	// manager/backstore for keypairs, mandatory
	KeypairManager KeypairManager
	// assertion checkers used by Database.Check, left unset DefaultCheckers will be used which is recommended
	Checkers []Checker
}

DatabaseConfig for an assertion database.

type Decoder 

type Decoder struct {
	// contains filtered or unexported fields
}

Decoder parses a stream of assertions bundled by separating them with double newlines.

func NewDecoder 

func NewDecoder(r io.Reader) *Decoder

NewDecoder returns a Decoder to parse the stream of assertions from the reader.

func (*Decoder) Decode 

func (d *Decoder) Decode() (Assertion, error)

Decode parses the next assertion from the stream. It returns the error io.EOF at the end of a well-formed stream.

type DeviceSerial 

type DeviceSerial struct {
	// contains filtered or unexported fields
}

DeviceSerial holds a device-serial assertion, which is a statement binding a device identity with the device public key.

func (*DeviceSerial) AuthorityID 

func (ab *DeviceSerial) AuthorityID() string

AuthorityID returns the authority-id a.k.a the signer id of the assertion.

func (*DeviceSerial) Body 

func (ab *DeviceSerial) Body() []byte

Body returns the body of the assertion.

func (*DeviceSerial) BrandID 

func (ds *DeviceSerial) BrandID() string

BrandID returns the brand identifier of the device.

func (*DeviceSerial) DeviceKey 

func (ds *DeviceSerial) DeviceKey() PublicKey

DeviceKey returns the public key of the device.

func (*DeviceSerial) Header 

func (ab *DeviceSerial) Header(name string) string

Header returns the value of an header by name.

func (*DeviceSerial) Headers 

func (ab *DeviceSerial) Headers() map[string]string

Headers returns the complete headers.

func (*DeviceSerial) Model 

func (ds *DeviceSerial) Model() string

Model returns the model name identifier of the device.

func (*DeviceSerial) Revision 

func (ab *DeviceSerial) Revision() int

Revision returns the assertion revision.

func (*DeviceSerial) Serial 

func (ds *DeviceSerial) Serial() string

Serial returns the serial of the device, together with brand id and model they form the unique identifier of the device.

func (*DeviceSerial) Signature 

func (ab *DeviceSerial) Signature() (content, signature []byte)

Signature returns the signed content and its unprocessed signature.

func (*DeviceSerial) Timestamp 

func (ds *DeviceSerial) Timestamp() time.Time

Timestamp returns the time when the device-serial assertion was issued.

func (*DeviceSerial) Type 

func (ab *DeviceSerial) Type() *AssertionType

Type returns the assertion type.

type Encoder 

type Encoder struct {
	// contains filtered or unexported fields
}

Encoder emits a stream of assertions bundled by separating them with double newlines.

func NewEncoder 

func NewEncoder(w io.Writer) *Encoder

NewEncoder returns a Encoder to emit a stream of assertions to a writer.

func (*Encoder) Encode 

func (enc *Encoder) Encode(assert Assertion) error

Encode emits the assertion into the stream with the required separator. Errors here are always about writing given that Encode() itself cannot error.

type Identity 

type Identity struct {
	// contains filtered or unexported fields
}

Identity holds an identity assertion, which provides a name for an account and the authority's confidence in the name's validity.

func (*Identity) AccountID 

func (id *Identity) AccountID() string

AccountID returns the account-id of the identit.

func (*Identity) AuthorityID 

func (ab *Identity) AuthorityID() string

AuthorityID returns the authority-id a.k.a the signer id of the assertion.

func (*Identity) Body 

func (ab *Identity) Body() []byte

Body returns the body of the assertion.

func (*Identity) DisplayName 

func (id *Identity) DisplayName() string

DisplayName returns the human-friendly name for the identity.

func (*Identity) Header 

func (ab *Identity) Header(name string) string

Header returns the value of an header by name.

func (*Identity) Headers 

func (ab *Identity) Headers() map[string]string

Headers returns the complete headers.

func (*Identity) IsCertified 

func (id *Identity) IsCertified() bool

IsCertified returns true if the authority has confidence in the identity's name.

func (*Identity) Revision 

func (ab *Identity) Revision() int

Revision returns the assertion revision.

func (*Identity) Signature 

func (ab *Identity) Signature() (content, signature []byte)

Signature returns the signed content and its unprocessed signature.

func (*Identity) Timestamp 

func (id *Identity) Timestamp() time.Time

Timestamp returns the time when the identity was issued.

func (*Identity) Type 

func (ab *Identity) Type() *AssertionType

Type returns the assertion type.

type KeypairManager 

type KeypairManager interface {
	// Put stores the given private/public key pair for identity,
	// making sure it can be later retrieved by authority-id and
	// key id with Get().
	// Trying to store a key with an already present key id should
	// result in an error.
	Put(authorityID string, privKey PrivateKey) error
	// Get returns the private/public key pair with the given key id.
	Get(authorityID, keyID string) (PrivateKey, error)
}

A KeypairManager is a manager and backstore for private/public key pairs.

func NewMemoryKeypairManager 

func NewMemoryKeypairManager() KeypairManager

NewMemoryKeypairManager creates a new key pair manager with a memory backstore.

func OpenFSKeypairManager 

func OpenFSKeypairManager(path string) (KeypairManager, error)

OpenFSKeypairManager opens a filesystem backed assertions backstore under path.

type Model 

type Model struct {
	// contains filtered or unexported fields
}

Model holds a model assertion, which is a statement by a brand about the properties of a device model.

func (*Model) AllowedModes 

func (mod *Model) AllowedModes() []string

AllowedModes returns which ones of the "classic" and "developer" modes are allowed for the model.

func (*Model) Architecture 

func (mod *Model) Architecture() string

Architecture returns the archicteture the model is based on.

func (*Model) AuthorityID 

func (ab *Model) AuthorityID() string

AuthorityID returns the authority-id a.k.a the signer id of the assertion.

func (*Model) Body 

func (ab *Model) Body() []byte

Body returns the body of the assertion.

func (*Model) BrandID 

func (mod *Model) BrandID() string

BrandID returns the brand identifier. Same as the authority id.

func (*Model) Class 

func (mod *Model) Class() string

Class returns which class the model belongs to defining policies for additional software installation.

func (*Model) Gadget 

func (mod *Model) Gadget() string

Gadget returns the gadget snap the model uses.

func (*Model) Header 

func (ab *Model) Header(name string) string

Header returns the value of an header by name.

func (*Model) Headers 

func (ab *Model) Headers() map[string]string

Headers returns the complete headers.

func (*Model) Kernel 

func (mod *Model) Kernel() string

Kernel returns the kernel snap the model uses.

func (*Model) Model 

func (mod *Model) Model() string

Model returns the model name identifier.

func (*Model) OS 

func (mod *Model) OS() string

OS returns the OS variant the model uses.

func (*Model) RequiredSnaps 

func (mod *Model) RequiredSnaps() []string

RequiredSnaps returns the snaps that must be installed at all times and cannot be removed for this model.

func (*Model) Revision 

func (ab *Model) Revision() int

Revision returns the assertion revision.

func (*Model) Series 

func (mod *Model) Series() string

Series returns the series of the core software the model uses.

func (*Model) Signature 

func (ab *Model) Signature() (content, signature []byte)

Signature returns the signed content and its unprocessed signature.

func (*Model) Store 

func (mod *Model) Store() string

Store returns the snap store the model uses.

func (*Model) Timestamp 

func (mod *Model) Timestamp() time.Time

Timestamp returns the time when the model assertion was issued.

func (*Model) Type 

func (ab *Model) Type() *AssertionType

Type returns the assertion type.

type PrivateKey 

type PrivateKey interface {
	// PublicKey returns the public part of the pair.
	PublicKey() PublicKey
	// contains filtered or unexported methods
}

PrivateKey is a cryptographic private/public key pair.

func OpenPGPPrivateKey 

func OpenPGPPrivateKey(privk *packet.PrivateKey) PrivateKey

OpenPGPPrivateKey returns a PrivateKey for database use out of a opengpg packet.PrivateKey.

type PublicKey 

type PublicKey interface {
	// Fingerprint returns the key fingerprint.
	Fingerprint() string
	// ID returns the id of the key as used to match signatures to their signing key.
	ID() string
	// contains filtered or unexported methods
}

PublicKey is the public part of a cryptographic private/public key pair.

func OpenPGPPublicKey 

func OpenPGPPublicKey(pubKey *packet.PublicKey) PublicKey

OpenPGPPublicKey returns a database useable public key out of a opengpg packet.PulicKey.

type RODatabase 

type RODatabase interface {
	// Find an assertion based on arbitrary headers.
	// Provided headers must contain the primary key for the assertion type.
	// It returns ErrNotFound if the assertion cannot be found.
	Find(assertionType *AssertionType, headers map[string]string) (Assertion, error)
	// FindMany finds assertions based on arbitrary headers.
	// It returns ErrNotFound if no assertion can be found.
	FindMany(assertionType *AssertionType, headers map[string]string) ([]Assertion, error)
}

A RODatabase exposes read-only access to an assertion database.

type RevisionError 

type RevisionError struct {
	Used, Current int
}

RevisionError indicates a revision improperly used for an operation.

func (*RevisionError) Error 

func (e *RevisionError) Error() string

type Signature 

type Signature interface {
	// KeyID() returns a suffix of the signing key fingerprint
	KeyID() string
}

Signature is a cryptographic signature.

type SnapBuild 

type SnapBuild struct {
	// contains filtered or unexported fields
}

SnapBuild holds a snap-build assertion, asserting the properties of a snap at the time it was built by the developer.

func (*SnapBuild) AuthorityID 

func (ab *SnapBuild) AuthorityID() string

AuthorityID returns the authority-id a.k.a the signer id of the assertion.

func (*SnapBuild) Body 

func (ab *SnapBuild) Body() []byte

Body returns the body of the assertion.

func (*SnapBuild) Grade 

func (snapbld *SnapBuild) Grade() string

Grade returns the grade of the snap: devel|stable

func (*SnapBuild) Header 

func (ab *SnapBuild) Header(name string) string

Header returns the value of an header by name.

func (*SnapBuild) Headers 

func (ab *SnapBuild) Headers() map[string]string

Headers returns the complete headers.

func (*SnapBuild) Revision 

func (ab *SnapBuild) Revision() int

Revision returns the assertion revision.

func (*SnapBuild) Series 

func (snapbld *SnapBuild) Series() string

Series returns the series for which the snap was built.

func (*SnapBuild) Signature 

func (ab *SnapBuild) Signature() (content, signature []byte)

Signature returns the signed content and its unprocessed signature.

func (*SnapBuild) SnapDigest 

func (snapbld *SnapBuild) SnapDigest() string

SnapDigest returns the digest of the snap. The digest is prefixed with the algorithm used to generate it.

func (*SnapBuild) SnapID 

func (snapbld *SnapBuild) SnapID() string

SnapID returns the snap id of the snap.

func (*SnapBuild) SnapSize 

func (snapbld *SnapBuild) SnapSize() uint64

SnapSize returns the size of the snap.

func (*SnapBuild) Timestamp 

func (snapbld *SnapBuild) Timestamp() time.Time

Timestamp returns the time when the snap-build assertion was created.

func (*SnapBuild) Type 

func (ab *SnapBuild) Type() *AssertionType

Type returns the assertion type.

type SnapDeclaration 

type SnapDeclaration struct {
	// contains filtered or unexported fields
}

SnapDeclaration holds a snap-declaration assertion, declaring a snap binding its identifying snap-id to a name, asserting its publisher and its other properties.

func (*SnapDeclaration) AuthorityID 

func (ab *SnapDeclaration) AuthorityID() string

AuthorityID returns the authority-id a.k.a the signer id of the assertion.

func (*SnapDeclaration) Body 

func (ab *SnapDeclaration) Body() []byte

Body returns the body of the assertion.

func (*SnapDeclaration) Gates 

func (snapdcl *SnapDeclaration) Gates() []string

Gates returns the list of snap-ids gated by this snap.

func (*SnapDeclaration) Header 

func (ab *SnapDeclaration) Header(name string) string

Header returns the value of an header by name.

func (*SnapDeclaration) Headers 

func (ab *SnapDeclaration) Headers() map[string]string

Headers returns the complete headers.

func (*SnapDeclaration) PublisherID 

func (snapdcl *SnapDeclaration) PublisherID() string

PublisherID returns the identifier of the publisher of the declared snap.

func (*SnapDeclaration) Revision 

func (ab *SnapDeclaration) Revision() int

Revision returns the assertion revision.

func (*SnapDeclaration) Series 

func (snapdcl *SnapDeclaration) Series() string

Series returns the series for which the snap is being declared.

func (*SnapDeclaration) Signature 

func (ab *SnapDeclaration) Signature() (content, signature []byte)

Signature returns the signed content and its unprocessed signature.

func (*SnapDeclaration) SnapID 

func (snapdcl *SnapDeclaration) SnapID() string

SnapID returns the snap id of the declared snap.

func (*SnapDeclaration) SnapName 

func (snapdcl *SnapDeclaration) SnapName() string

SnapName returns the declared snap name.

func (*SnapDeclaration) Timestamp 

func (snapdcl *SnapDeclaration) Timestamp() time.Time

Timestamp returns the time when the snap-declaration was issued.

func (*SnapDeclaration) Type 

func (ab *SnapDeclaration) Type() *AssertionType

Type returns the assertion type.

type SnapRevision 

type SnapRevision struct {
	// contains filtered or unexported fields
}

SnapRevision holds a snap-revision assertion, which is a statement by the store acknowledging the receipt of a build of a snap and labeling it with a snap revision.

func (*SnapRevision) AuthorityID 

func (ab *SnapRevision) AuthorityID() string

AuthorityID returns the authority-id a.k.a the signer id of the assertion.

func (*SnapRevision) Body 

func (ab *SnapRevision) Body() []byte

Body returns the body of the assertion.

func (*SnapRevision) DeveloperID 

func (snaprev *SnapRevision) DeveloperID() string

DeveloperID returns the id of the developer that submitted this build of the snap.

func (*SnapRevision) Header 

func (ab *SnapRevision) Header(name string) string

Header returns the value of an header by name.

func (*SnapRevision) Headers 

func (ab *SnapRevision) Headers() map[string]string

Headers returns the complete headers.

func (*SnapRevision) Revision 

func (ab *SnapRevision) Revision() int

Revision returns the assertion revision.

func (*SnapRevision) Series 

func (snaprev *SnapRevision) Series() string

Series returns the series of the snap submitted to and acknowledged by the store.

func (*SnapRevision) Signature 

func (ab *SnapRevision) Signature() (content, signature []byte)

Signature returns the signed content and its unprocessed signature.

func (*SnapRevision) SnapDigest 

func (snaprev *SnapRevision) SnapDigest() string

SnapDigest returns the digest of the snap submitted to and acknowledged by the store. The digest is prefixed with the algorithm used to generate it.

func (*SnapRevision) SnapID 

func (snaprev *SnapRevision) SnapID() string

SnapID returns the snap id of the snap.

func (*SnapRevision) SnapRevision 

func (snaprev *SnapRevision) SnapRevision() uint64

SnapRevision returns the revision assigned to this build of the snap.

func (*SnapRevision) SnapSize 

func (snaprev *SnapRevision) SnapSize() uint64

SnapSize returns the size in bytes of the snap submitted to the store.

func (*SnapRevision) Timestamp 

func (snaprev *SnapRevision) Timestamp() time.Time

Timestamp returns the time when the snap-revision was issued.

func (*SnapRevision) Type 

func (ab *SnapRevision) Type() *AssertionType

Type returns the assertion type.

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