path: root/cmd/swarm/download.go

// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package main

import (
    "fmt"
    "os"
    "path/filepath"
    "strings"

    "github.com/ethereum/go-ethereum/cmd/utils"
    "github.com/ethereum/go-ethereum/log"
    "github.com/ethereum/go-ethereum/swarm/api"
    swarm "github.com/ethereum/go-ethereum/swarm/api/client"
    "gopkg.in/urfave/cli.v1"
)

var downloadCommand = cli.Command{
    Action:      download,
    Name:        "down",
    Flags:       []cli.Flag{SwarmRecursiveFlag, SwarmAccessPasswordFlag},
    Usage:       "downloads a swarm manifest or a file inside a manifest",
    ArgsUsage:   " <uri> [<dir>]",
    Description: `Downloads a swarm bzz uri to the given dir. When no dir is provided, working directory is assumed. --recursive flag is expected when downloading a manifest with multiple entries.`,
}

func download(ctx *cli.Context) {
    log.Debug("downloading content using swarm down")
    args := ctx.Args()
    dest := "."

    switch len(args) {
    case 0:
        utils.Fatalf("Usage: swarm down [options] <bzz locator> [<destination path>]")
    case 1:
        log.Trace(fmt.Sprintf("swarm down: no destination path - assuming working dir"))
    default:
        log.Trace(fmt.Sprintf("destination path arg: %s", args[1]))
        if absDest, err := filepath.Abs(args[1]); err == nil {
            dest = absDest
        } else {
            utils.Fatalf("could not get download path: %v", err)
        }
    }

    var (
        bzzapi      = strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
        isRecursive = ctx.Bool(SwarmRecursiveFlag.Name)
        client      = swarm.NewClient(bzzapi)
    )

    if fi, err := os.Stat(dest); err == nil {
        if isRecursive && !fi.Mode().IsDir() {
            utils.Fatalf("destination path is not a directory!")
        }
    } else {
        if !os.IsNotExist(err) {
            utils.Fatalf("could not stat path: %v", err)
        }
    }

    uri, err := api.Parse(args[0])
    if err != nil {
        utils.Fatalf("could not parse uri argument: %v", err)
    }

    dl := func(credentials string) error {
        // assume behaviour according to --recursive switch
        if isRecursive {
            if err := client.DownloadDirectory(uri.Addr, uri.Path, dest, credentials); err != nil {
                if err == swarm.ErrUnauthorized {
                    return err
                }
                return fmt.Errorf("directory %s: %v", uri.Path, err)
            }
        } else {
            // we are downloading a file
            log.Debug("downloading file/path from a manifest", "uri.Addr", uri.Addr, "uri.Path", uri.Path)

            err := client.DownloadFile(uri.Addr, uri.Path, dest, credentials)
            if err != nil {
                if err == swarm.ErrUnauthorized {
                    return err
                }
                return fmt.Errorf("file %s from address: %s: %v", uri.Path, uri.Addr, err)
            }
        }
        return nil
    }
    if passwords := makePasswordList(ctx); passwords != nil {
        password := getPassPhrase(fmt.Sprintf("Downloading %s is restricted", uri), 0, passwords)
        err = dl(password)
    } else {
        err = dl("")
    }
    if err != nil {
        utils.Fatalf("download: %v", err)
    }
}