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-rw-r--r--identity/version.go169
1 files changed, 113 insertions, 56 deletions
diff --git a/identity/version.go b/identity/version.go
index bbf93575..bbf0a3f5 100644
--- a/identity/version.go
+++ b/identity/version.go
@@ -2,9 +2,11 @@ package identity
import (
"crypto/rand"
+ "crypto/sha256"
"encoding/json"
"fmt"
"strings"
+ "time"
"github.com/pkg/errors"
@@ -15,76 +17,133 @@ import (
)
// 1: original format
-const formatVersion = 1
-
-// Version is a complete set of information about an Identity at a point in time.
-type Version struct {
- // The lamport time at which this version become effective
- // The reference time is the bug edition lamport clock
- // It must be the first field in this struct due to https://github.com/golang/go/issues/599
- //
- // TODO: BREAKING CHANGE - this need to actually be one edition lamport time **per entity**
- // This is not a problem right now but will be when more entities are added (pull-request, config ...)
- time lamport.Time
- unixTime int64
+// 2: Identity Ids are generated from the first version serialized data instead of from the first git commit
+const formatVersion = 2
+
+// TODO ^^
+// version is a complete set of information about an Identity at a point in time.
+type version struct {
name string
email string // as defined in git or from a bridge when importing the identity
login string // from a bridge when importing the identity
avatarURL string
+ // The lamport times of the other entities at which this version become effective
+ times map[string]lamport.Time
+ unixTime int64
+
// The set of keys valid at that time, from this version onward, until they get removed
// in a new version. This allow to have multiple key for the same identity (e.g. one per
// device) as well as revoke key.
keys []*Key
- // This optional array is here to ensure a better randomness of the identity id to avoid collisions.
+ // mandatory random bytes to ensure a better randomness of the data of the first
+ // version of a bug, used to later generate the ID
+ // len(Nonce) should be > 20 and < 64 bytes
// It has no functional purpose and should be ignored.
- // It is advised to fill this array if there is not enough entropy, e.g. if there is no keys.
+ // TODO: optional?
nonce []byte
// A set of arbitrary key/value to store metadata about a version or about an Identity in general.
metadata map[string]string
+ // Not serialized. Store the version's id in memory.
+ id entity.Id
// Not serialized
commitHash repository.Hash
}
-type VersionJSON struct {
+func newVersion(repo repository.RepoClock, name string, email string, login string, avatarURL string, keys []*Key) (*version, error) {
+ clocks, err := repo.AllClocks()
+ if err != nil {
+ return nil, err
+ }
+
+ times := make(map[string]lamport.Time)
+ for name, clock := range clocks {
+ times[name] = clock.Time()
+ }
+
+ return &version{
+ id: entity.UnsetId,
+ name: name,
+ email: email,
+ login: login,
+ avatarURL: avatarURL,
+ times: times,
+ unixTime: time.Now().Unix(),
+ keys: keys,
+ nonce: makeNonce(20),
+ }, nil
+}
+
+type versionJSON struct {
// Additional field to version the data
FormatVersion uint `json:"version"`
- Time lamport.Time `json:"time"`
- UnixTime int64 `json:"unix_time"`
- Name string `json:"name,omitempty"`
- Email string `json:"email,omitempty"`
- Login string `json:"login,omitempty"`
- AvatarUrl string `json:"avatar_url,omitempty"`
- Keys []*Key `json:"pub_keys,omitempty"`
- Nonce []byte `json:"nonce,omitempty"`
- Metadata map[string]string `json:"metadata,omitempty"`
+ Times map[string]lamport.Time `json:"times"`
+ UnixTime int64 `json:"unix_time"`
+ Name string `json:"name,omitempty"`
+ Email string `json:"email,omitempty"`
+ Login string `json:"login,omitempty"`
+ AvatarUrl string `json:"avatar_url,omitempty"`
+ Keys []*Key `json:"pub_keys,omitempty"`
+ Nonce []byte `json:"nonce"`
+ Metadata map[string]string `json:"metadata,omitempty"`
+}
+
+// Id return the identifier of the version
+func (v *version) Id() entity.Id {
+ if v.id == "" {
+ // something went really wrong
+ panic("version's id not set")
+ }
+ if v.id == entity.UnsetId {
+ // This means we are trying to get the version's Id *before* it has been stored.
+ // As the Id is computed based on the actual bytes written on the disk, we are going to predict
+ // those and then get the Id. This is safe as it will be the exact same code writing on disk later.
+ data, err := json.Marshal(v)
+ if err != nil {
+ panic(err)
+ }
+ v.id = deriveId(data)
+ }
+ return v.id
+}
+
+func deriveId(data []byte) entity.Id {
+ sum := sha256.Sum256(data)
+ return entity.Id(fmt.Sprintf("%x", sum))
}
// Make a deep copy
-func (v *Version) Clone() *Version {
- clone := &Version{
- name: v.name,
- email: v.email,
- avatarURL: v.avatarURL,
- keys: make([]*Key, len(v.keys)),
+func (v *version) Clone() *version {
+ // copy direct fields
+ clone := *v
+
+ clone.times = make(map[string]lamport.Time)
+ for name, t := range v.times {
+ clone.times[name] = t
}
+ clone.keys = make([]*Key, len(v.keys))
for i, key := range v.keys {
clone.keys[i] = key.Clone()
}
- return clone
+ clone.nonce = make([]byte, len(v.nonce))
+ copy(clone.nonce, v.nonce)
+
+ // not copying metadata
+
+ return &clone
}
-func (v *Version) MarshalJSON() ([]byte, error) {
- return json.Marshal(VersionJSON{
+func (v *version) MarshalJSON() ([]byte, error) {
+ return json.Marshal(versionJSON{
FormatVersion: formatVersion,
- Time: v.time,
+ Times: v.times,
UnixTime: v.unixTime,
Name: v.name,
Email: v.email,
@@ -96,8 +155,8 @@ func (v *Version) MarshalJSON() ([]byte, error) {
})
}
-func (v *Version) UnmarshalJSON(data []byte) error {
- var aux VersionJSON
+func (v *version) UnmarshalJSON(data []byte) error {
+ var aux versionJSON
if err := json.Unmarshal(data, &aux); err != nil {
return err
@@ -110,7 +169,8 @@ func (v *Version) UnmarshalJSON(data []byte) error {
return entity.NewErrNewFormatVersion(aux.FormatVersion)
}
- v.time = aux.Time
+ v.id = deriveId(data)
+ v.times = aux.Times
v.unixTime = aux.UnixTime
v.name = aux.Name
v.email = aux.Email
@@ -123,23 +183,18 @@ func (v *Version) UnmarshalJSON(data []byte) error {
return nil
}
-func (v *Version) Validate() error {
+func (v *version) Validate() error {
// time must be set after a commit
if v.commitHash != "" && v.unixTime == 0 {
return fmt.Errorf("unix time not set")
}
- if v.commitHash != "" && v.time == 0 {
- return fmt.Errorf("lamport time not set")
- }
if text.Empty(v.name) && text.Empty(v.login) {
return fmt.Errorf("either name or login should be set")
}
-
if strings.Contains(v.name, "\n") {
return fmt.Errorf("name should be a single line")
}
-
if !text.Safe(v.name) {
return fmt.Errorf("name is not fully printable")
}
@@ -147,7 +202,6 @@ func (v *Version) Validate() error {
if strings.Contains(v.login, "\n") {
return fmt.Errorf("login should be a single line")
}
-
if !text.Safe(v.login) {
return fmt.Errorf("login is not fully printable")
}
@@ -155,7 +209,6 @@ func (v *Version) Validate() error {
if strings.Contains(v.email, "\n") {
return fmt.Errorf("email should be a single line")
}
-
if !text.Safe(v.email) {
return fmt.Errorf("email is not fully printable")
}
@@ -167,6 +220,9 @@ func (v *Version) Validate() error {
if len(v.nonce) > 64 {
return fmt.Errorf("nonce is too big")
}
+ if len(v.nonce) < 20 {
+ return fmt.Errorf("nonce is too small")
+ }
for _, k := range v.keys {
if err := k.Validate(); err != nil {
@@ -177,9 +233,9 @@ func (v *Version) Validate() error {
return nil
}
-// Write will serialize and store the Version as a git blob and return
+// Write will serialize and store the version as a git blob and return
// its hash
-func (v *Version) Write(repo repository.Repo) (repository.Hash, error) {
+func (v *version) Write(repo repository.Repo) (repository.Hash, error) {
// make sure we don't write invalid data
err := v.Validate()
if err != nil {
@@ -187,17 +243,18 @@ func (v *Version) Write(repo repository.Repo) (repository.Hash, error) {
}
data, err := json.Marshal(v)
-
if err != nil {
return "", err
}
hash, err := repo.StoreData(data)
-
if err != nil {
return "", err
}
+ // make sure we set the Id when writing in the repo
+ v.id = deriveId(data)
+
return hash, nil
}
@@ -211,22 +268,22 @@ func makeNonce(len int) []byte {
}
// SetMetadata store arbitrary metadata about a version or an Identity in general
-// If the Version has been commit to git already, it won't be overwritten.
-func (v *Version) SetMetadata(key string, value string) {
+// If the version has been commit to git already, it won't be overwritten.
+// Beware: changing the metadata on a version will change it's ID
+func (v *version) SetMetadata(key string, value string) {
if v.metadata == nil {
v.metadata = make(map[string]string)
}
-
v.metadata[key] = value
}
-// GetMetadata retrieve arbitrary metadata about the Version
-func (v *Version) GetMetadata(key string) (string, bool) {
+// GetMetadata retrieve arbitrary metadata about the version
+func (v *version) GetMetadata(key string) (string, bool) {
val, ok := v.metadata[key]
return val, ok
}
-// AllMetadata return all metadata for this Version
-func (v *Version) AllMetadata() map[string]string {
+// AllMetadata return all metadata for this version
+func (v *version) AllMetadata() map[string]string {
return v.metadata
}
generated by cgit (git 2.34.1) at 2024-11-06 09:28:47 +0000