gosimplenpm/internal/handler/tar.go

package handler

import (
	"bytes"
	"fmt"
	"gosimplenpm/internal/config"
	"gosimplenpm/internal/storage"
	"io"
	"net/http"
	"net/url"
	"strconv"
	"strings"

	"github.com/gorilla/mux"
	"github.com/sirupsen/logrus"
)

func PackageTarGet(lg *logrus.Logger, cfg config.Config, stg storage.Storage) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// Sample  output of npm view
		// Public
		// dist
		// .tarball: https://registry.npmjs.org/react/-/react-18.2.0.tgz
		// LocalHost
		// dist
		// .tarball: http://localhost:4000/@ookusanya/package1/-/package1-0.2.0.tgz

		escapedName := mux.Vars(r)["name"]
		packageName, _ := url.PathUnescape(escapedName)
		lg.WithFields(logrus.Fields{
			"function": "get-tar",
		}).Debugf("Package name => %s\n", packageName)
		escapedName = mux.Vars(r)["tar"]
		tarFileNameWithScope, _ := url.PathUnescape(escapedName)
		lg.WithFields(logrus.Fields{
			"function": "get-tar",
		}).Debugf("Tarfile name => %s\n", tarFileNameWithScope)

		fmt.Printf("Tarfile name => %s\n", tarFileNameWithScope)

		fragments := strings.Split(tarFileNameWithScope, "/")
		tarFileName := fragments[len(fragments)-1]
		// fragments := strings.Split(urlFileFragment, "-")
		// versionFragment := fragments[len(fragments)-1]
		// versionName := strings.Split(versionFragment, ".tgz")[0]
		// fmt.Printf("Version name => %s\n", versionName)
		fileAsString, err := stg.GetTarFromStore(packageName, tarFileName, cfg.RepoDir, lg)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		// Sending the tar as a base64 string
		w.Header().Set("Content-Type", "application/octet-stream")
		w.Header().Set("Content-Length", strconv.Itoa(len([]byte(fileAsString))))
		io.Copy(w, bytes.NewReader([]byte(fileAsString)))
	}
}