mccl/internal/version_manifest/version_manifest.go

75 lines
2.2 KiB
Go
Executable File

package version_manifest
import (
"encoding/json"
"fmt"
"time"
)
// VersionManifestUrl is a URL to a version manifest JSON file of version 2.
const VersionManifestUrl = "https://launchermeta.mojang.com/mc/game/version_manifest_v2.json"
// VersionType is telling if it is a stable release or an intermedialry snapshot.
type VersionType string
const (
// VersionTypeSnapshot is an unstable intermediary version of a game.
VersionTypeSnapshot VersionType = "snapshot"
// VersionTypeRelease is a stable release version of a game.
VersionTypeRelease VersionType = "release"
)
// Version holds an information about a particular version.
type Version struct {
Id string `json:"id"`
Type VersionType `json:"type"`
Url string `json:"url"`
Time time.Time `json:"time"`
ReleaseTime time.Time `json:"releaseTime"`
Sha1 string `json:"sha1"`
}
// VersionManifest holds an array of all game versions, also a latest metadata
// that holds the latest release and snapshot.
type VersionManifest struct {
Latest struct {
Release string `json:"release"`
Snapshot string `json:"snapshot"`
} `json:"latest"`
Versions []Version `json:"versions"`
}
// New returns a new VersionManifest that holds info on every
// known Minecraft version.
func New(data []byte) (*VersionManifest, error) {
vm := &VersionManifest{}
if err := json.Unmarshal(data, vm); err != nil {
return nil, err
}
return vm, nil
}
// GetLatest returns a latest release or snapshot depending on a type provided.
func (vm *VersionManifest) GetLatest(typ VersionType) (Version, error) {
var version string
switch typ {
case VersionTypeSnapshot:
version = vm.Latest.Snapshot
case VersionTypeRelease:
version = vm.Latest.Release
default:
return Version{}, fmt.Errorf("version type %s doesn't exist", typ)
}
return vm.Get(version)
}
// Get returns a specific version of Minecraft.
func (vm *VersionManifest) Get(version string) (Version, error) {
for _, v := range vm.Versions {
if v.Id == version {
return v, nil
}
}
return Version{}, fmt.Errorf("version %s not found", version)
}