mccl/internal/manifest/manifest.go

package manifest

import (
	"encoding/json"
	"fmt"
	"mccl/pkg/util"
	"path"
	"strings"
)

type Manifest struct {
	InheritsFrom string `json:"inheritsFrom"`
	Arguments    struct {
		Game []Argument `json:"game"`
		Jvm  []Argument `json:"jvm"`
	} `json:"arguments"`
	AssetIndex struct {
		util.File
		TotalSize int `json:"totalSize"`
	} `json:"assetIndex"`
	Assets          string               `json:"assets"`
	ComplianceLevel int                  `json:"complianceLevel"`
	Downloads       map[string]util.File `json:"downloads"`
	Id              string               `json:"id"`
	JavaVersion     struct {
		Component    string `json:"component"`
		MajorVersion int    `json:"majorVersion"`
	} `json:"javaVersion"`
	Libraries []Library `json:"libraries"`
	Logging   struct {
		Client struct {
			Argument string    `json:"argument"`
			File     util.File `json:"file"`
			Type     string    `json:"type"`
		} `json:"client"`
	} `json:"logging"`
	MainClass              string `json:"mainClass"`
	MinecraftArguments     string `json:"minecraftArguments"`
	MinimumLauncherVersion int    `json:"minimumLauncherVersion"`
	ReleaseTime            string `json:"releaseTime"`
	Time                   string `json:"time"`
	Type                   string `json:"type"`
}

// New returns a new Manifest for a specific Minecraft version.
func New(data []byte) (*Manifest, error) {
	m := &Manifest{}
	if err := json.Unmarshal(data, m); err != nil {
		return nil, err
	}

	return m, nil
}

func (m *Manifest) BuildCommandLine(properties map[string]string) (arguments []string) {
	if m.MinecraftArguments != "" {
		arguments = append(arguments, fmt.Sprintf("-Djava.library.path=%s", properties["natives_directory"]))
		arguments = append(arguments, "-cp")
		arguments = append(arguments, properties["classpath"])
		arguments = append(arguments, m.MainClass)
		args := strings.Split(m.MinecraftArguments, " ")
		for _, arg := range args {
			if strings.HasPrefix(arg, "${") {
				propName := arg[2 : len(arg)-1]
				arg = properties[propName]
			}
			arguments = append(arguments, arg)
		}
		return arguments
	}

	var allArgs []Argument

	allArgs = append(allArgs, m.Arguments.Jvm...)

	if m.Logging.Client.Argument != "" {
		logConf := strings.Split(m.Logging.Client.Argument, "${")[0]
		logConf += properties["logging_path"]
		allArgs = append(allArgs, Argument{Value: []string{logConf}})
	}

	allArgs = append(allArgs, Argument{Value: []string{m.MainClass}})
	allArgs = append(allArgs, m.Arguments.Game...)

	for _, arg := range allArgs {
		ok, feature := arg.CheckRules()
		if !ok {
			continue
		} else if feature != FeatureUnknown {
			if _, ok := properties[feature.String()]; !ok {
				continue
			}
		}

		for _, v := range arg.Value {
			if strings.Contains(v, "${library_directory}") {
				v = strings.ReplaceAll(v, "${library_directory}", properties["library_directory"])
				v = strings.ReplaceAll(v, "${classpath_separator}", properties["classpath_separator"])
			} else if i := strings.Index(v, "${"); i != -1 {
				j := strings.Index(v, "}")
				propName := v[i+2 : j]
				switch propName {
				case "version_name":
					if strings.Contains(m.Id, "forge") {
						v = strings.ReplaceAll(v, "${version_name}", m.InheritsFrom)
					} else {
						v = strings.ReplaceAll(v, "${version_name}", m.Id)
					}

				case "assets_index_name":
					v = m.Assets
				case "version_type":
					v = m.Type
				default:
					v = strings.Replace(v, v[i:j+1], properties[propName], 1)
				}
			}
			arguments = append(arguments, v)
		}
	}

	return arguments
}

func (m *Manifest) BuildClasspath(baseDir, clientPath string) string {
	var sb []string = make([]string, 0, len(m.Libraries))
	for _, lib := range m.Libraries {
		if lib.CheckRules() {
			sb = append(sb, path.Join(baseDir, "libraries", lib.Path()))
			if natives := lib.Natives(); natives != nil {
				sb = append(sb, path.Join(baseDir, "libraries", natives.Path))
			}
		}
	}

	if m.InheritsFrom != "" {
		sb = append(sb, path.Join(clientPath, m.InheritsFrom, m.InheritsFrom+".jar"))
	} else {
		sb = append(sb, path.Join(clientPath, m.Id, m.Id+".jar"))
	}

	return strings.Join(sb, util.PathSeparator())
}

func (m *Manifest) InheritFrom(parent *Manifest) error {
	if parent == nil {
		return nil
	}

	m.Arguments.Game = append(parent.Arguments.Game, m.Arguments.Game...)
	m.Arguments.Jvm = append(parent.Arguments.Jvm, m.Arguments.Jvm...)

	if m.AssetIndex.TotalSize == 0 {
		m.AssetIndex.File = parent.AssetIndex.File
		m.AssetIndex.TotalSize = parent.AssetIndex.TotalSize
	}

	if m.Assets == "" {
		m.Assets = parent.Assets
	}

	if m.ComplianceLevel == 0 {
		m.ComplianceLevel = parent.ComplianceLevel
	}

	if m.Downloads == nil {
		m.Downloads = make(map[string]util.File)
	}

	for k, v := range parent.Downloads {
		m.Downloads[k] = v
	}

	if m.Id == "" {
		m.Id = parent.Id
	}

	if m.JavaVersion.Component != "" {
		m.JavaVersion.Component = parent.JavaVersion.Component
		m.JavaVersion.MajorVersion = parent.JavaVersion.MajorVersion
	}

merge_libs:
	for _, plib := range parent.Libraries {
		plname := strings.Split(plib.Name, ":")
		for _, lib := range m.Libraries {
			lname := strings.Split(lib.Name, ":")
			if len(plname) == len(lname) {
				if lname[0]+":"+lname[1] == plname[0]+":"+plname[1] {
					continue merge_libs
				}
			}
		}
		m.Libraries = append(m.Libraries, plib)
	}

	if m.Logging.Client.Argument == "" {
		m.Logging.Client.Argument = parent.Logging.Client.Argument
		m.Logging.Client.Type = parent.Logging.Client.Type
		m.Logging.Client.File = parent.Logging.Client.File
	}

	if m.MainClass == "" {
		m.MainClass = parent.MainClass
	}

	if m.MinecraftArguments == "" {
		m.MinecraftArguments = parent.MinecraftArguments
	}

	return nil
}