mirror of
https://github.com/safing/portmaster
synced 2025-04-21 19:39:09 +00:00
109 lines
3 KiB
Go
109 lines
3 KiB
Go
package updater
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"time"
|
|
)
|
|
|
|
const (
|
|
baseIndexExtension = ".json"
|
|
v2IndexExtension = ".v2.json"
|
|
)
|
|
|
|
// Index describes an index file pulled by the updater.
|
|
type Index struct {
|
|
// Path is the path to the index file
|
|
// on the update server.
|
|
Path string
|
|
|
|
// Channel holds the release channel name of the index.
|
|
// It must match the filename without extension.
|
|
Channel string
|
|
|
|
// PreRelease signifies that all versions of this index should be marked as
|
|
// pre-releases, no matter if the versions actually have a pre-release tag or
|
|
// not.
|
|
PreRelease bool
|
|
|
|
// AutoDownload specifies whether new versions should be automatically downloaded.
|
|
AutoDownload bool
|
|
|
|
// LastRelease holds the time of the last seen release of this index.
|
|
LastRelease time.Time
|
|
}
|
|
|
|
// IndexFile represents an index file.
|
|
type IndexFile struct {
|
|
Channel string
|
|
Published time.Time
|
|
|
|
Releases map[string]string
|
|
}
|
|
|
|
var (
|
|
// ErrIndexChecksumMismatch is returned when an index does not match its
|
|
// signed checksum.
|
|
ErrIndexChecksumMismatch = errors.New("index checksum does mot match signature")
|
|
|
|
// ErrIndexFromFuture is returned when an index is parsed with a
|
|
// Published timestamp that lies in the future.
|
|
ErrIndexFromFuture = errors.New("index is from the future")
|
|
|
|
// ErrIndexIsOlder is returned when an index is parsed with an older
|
|
// Published timestamp than the current Published timestamp.
|
|
ErrIndexIsOlder = errors.New("index is older than the current one")
|
|
|
|
// ErrIndexChannelMismatch is returned when an index is parsed with a
|
|
// different channel that the expected one.
|
|
ErrIndexChannelMismatch = errors.New("index does not match the expected channel")
|
|
)
|
|
|
|
// ParseIndexFile parses an index file and checks if it is valid.
|
|
func ParseIndexFile(indexData []byte, channel string, lastIndexRelease time.Time) (*IndexFile, error) {
|
|
// Load into struct.
|
|
indexFile := &IndexFile{}
|
|
err := json.Unmarshal(indexData, indexFile)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to parse signed index data: %w", err)
|
|
}
|
|
|
|
// Fallback to old format if there are no releases and no channel is defined.
|
|
// TODO: Remove in v1
|
|
if len(indexFile.Releases) == 0 && indexFile.Channel == "" {
|
|
return loadOldIndexFormat(indexData, channel)
|
|
}
|
|
|
|
// Check the index metadata.
|
|
switch {
|
|
case !indexFile.Published.IsZero() && time.Now().Before(indexFile.Published):
|
|
return indexFile, ErrIndexFromFuture
|
|
|
|
case !indexFile.Published.IsZero() &&
|
|
!lastIndexRelease.IsZero() &&
|
|
lastIndexRelease.After(indexFile.Published):
|
|
return indexFile, ErrIndexIsOlder
|
|
|
|
case channel != "" &&
|
|
indexFile.Channel != "" &&
|
|
channel != indexFile.Channel:
|
|
return indexFile, ErrIndexChannelMismatch
|
|
}
|
|
|
|
return indexFile, nil
|
|
}
|
|
|
|
func loadOldIndexFormat(indexData []byte, channel string) (*IndexFile, error) {
|
|
releases := make(map[string]string)
|
|
err := json.Unmarshal(indexData, &releases)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &IndexFile{
|
|
Channel: channel,
|
|
// Do NOT define `Published`, as this would break the "is newer" check.
|
|
Releases: releases,
|
|
}, nil
|
|
}
|