BedrockFetch/bds/fetch.go

package bds

import (
	"regexp"

	"sirherobrine23.org/minecraft-server/bedrockfetch/internal/request"
)

var fileMatch = regexp.MustCompile(`(?m)bin-(?P<Platform>win|linux)-?(?P<isPreview>preview)?\/bedrock-server-(?P<Version>[0-9\.]+)\.zip$`)

// FindAllGroups returns a map with each match group. The map key corresponds to the match group name.
// A nil return value indicates no matches.
func FindAllGroups(re *regexp.Regexp, s string) map[string]string {
	matches := re.FindStringSubmatch(s)
	subnames := re.SubexpNames()
	if matches == nil || len(matches) != len(subnames) {
		return nil
	}

	matchMap := map[string]string{}
	for i := 1; i < len(matches); i++ {
		matchMap[subnames[i]] = matches[i]
	}

	return matchMap
}

type FileInfo struct {
	FileUrl   string // Zip file url
	Platform  string // Target
	IsPreview bool   // Is preview server release
}

func MinecraftFetch() (map[string][]FileInfo, error) {
	links, _, _, err := request.RequestHtmlLinks(request.RequestOptions{
		Url: "https://www.minecraft.net/en-us/download/server/bedrock",
		HttpError: true,
	})

	if err != nil {
		return nil, err
	}

	// Filter files
	zipFiles := map[string][]FileInfo{}

	for _, file := range links {
		if fileMatch.MatchString(file) {
			info := FindAllGroups(fileMatch, file)
			if _, existVer := zipFiles[info["Version"]]; !existVer {
				zipFiles[info["Version"]] = []FileInfo{}
			}

			zipFiles[info["Version"]] = append(zipFiles[info["Version"]], FileInfo{
				FileUrl: file,
				Platform: info["Platform"],
				IsPreview: info["isPreview"] != "",
			})
		}
	}

	return zipFiles, nil
}