update: add the package page

lib/package.go

@@ -1,11 +1,17 @@
 package lib
 
 import (
+	"archive/tar"
+	"bufio"
+	"compress/gzip"
 	"fmt"
 	"io"
 	"net/url"
+	"os"
+	"path"
 	"strings"
 
+	"git.matterlinux.xyz/matter/tracker/log"
 	"github.com/bigkevmcd/go-configparser"
 )
 
@@ -16,6 +22,49 @@ type Package struct {
 	Depends []string `json:"depends"`
 	Size    string   `json:"size"`
 	Desc    string   `json:"desc"`
+	Archive string   `json:"archive"`
+}
+
+func (p *Package) Files() []string {
+	var (
+		gzip_reader io.Reader
+		header      *tar.Header
+		result      []string
+		file        *os.File
+		err         error
+	)
+
+	if file, err = os.Open(p.Archive); err != nil {
+		log.Error("Failed to open %s", p.Archive)
+		return result
+	}
+	defer file.Close()
+
+	if gzip_reader, err = gzip.NewReader(bufio.NewReader(file)); err != nil {
+		log.Error("Failed to create reader for %s", p.Archive)
+		return result
+	}
+
+	reader := tar.NewReader(gzip_reader)
+
+	for header, err = reader.Next(); err == nil; header, err = reader.Next() {
+		if header.Typeflag != tar.TypeReg {
+			continue
+		}
+
+		if path.Base(header.Name) != "files.tar.gz" {
+			continue
+		}
+
+		if result, err = GetFiles(reader); err == nil {
+			break
+		}
+
+		log.Error("Failed to get file list for %s: %s", p.Archive, err.Error())
+		return []string{}
+	}
+
+	return result
 }
 
 func (p *Package) URL() string {