path: root/cmd/swarm/upload.go

// Copyright 2016 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/>.

// Command bzzup uploads files to the swarm HTTP API.
package main

import (
    "errors"
    "fmt"
    "io"
    "io/ioutil"
    "mime"
    "net/http"
    "os"
    "os/user"
    "path"
    "path/filepath"
    "strings"

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

func upload(ctx *cli.Context) {

    args := ctx.Args()
    var (
        bzzapi       = strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
        recursive    = ctx.GlobalBool(SwarmRecursiveUploadFlag.Name)
        wantManifest = ctx.GlobalBoolT(SwarmWantManifestFlag.Name)
        defaultPath  = ctx.GlobalString(SwarmUploadDefaultPath.Name)
        fromStdin    = ctx.GlobalBool(SwarmUpFromStdinFlag.Name)
        mimeType     = ctx.GlobalString(SwarmUploadMimeType.Name)
        client       = swarm.NewClient(bzzapi)
        file         string
    )

    if len(args) != 1 {
        if fromStdin {
            tmp, err := ioutil.TempFile("", "swarm-stdin")
            if err != nil {
                utils.Fatalf("error create tempfile: %s", err)
            }
            defer os.Remove(tmp.Name())
            n, err := io.Copy(tmp, os.Stdin)
            if err != nil {
                utils.Fatalf("error copying stdin to tempfile: %s", err)
            } else if n == 0 {
                utils.Fatalf("error reading from stdin: zero length")
            }
            file = tmp.Name()
        } else {
            utils.Fatalf("Need filename as the first and only argument")
        }
    } else {
        file = expandPath(args[0])
    }

    if !wantManifest {
        f, err := swarm.Open(file)
        if err != nil {
            utils.Fatalf("Error opening file: %s", err)
        }
        defer f.Close()
        hash, err := client.UploadRaw(f, f.Size)
        if err != nil {
            utils.Fatalf("Upload failed: %s", err)
        }
        fmt.Println(hash)
        return
    }

    stat, err := os.Stat(file)
    if err != nil {
        utils.Fatalf("Error opening file: %s", err)
    }

    // define a function which either uploads a directory or single file
    // based on the type of the file being uploaded
    var doUpload func() (hash string, err error)
    if stat.IsDir() {
        doUpload = func() (string, error) {
            if !recursive {
                return "", errors.New("Argument is a directory and recursive upload is disabled")
            }
            return client.UploadDirectory(file, defaultPath, "")
        }
    } else {
        doUpload = func() (string, error) {
            f, err := swarm.Open(file)
            if err != nil {
                return "", fmt.Errorf("error opening file: %s", err)
            }
            defer f.Close()
            if mimeType == "" {
                mimeType = detectMimeType(file)
            }
            f.ContentType = mimeType
            return client.Upload(f, "")
        }
    }
    hash, err := doUpload()
    if err != nil {
        utils.Fatalf("Upload failed: %s", err)
    }
    fmt.Println(hash)
}

// Expands a file path
// 1. replace tilde with users home dir
// 2. expands embedded environment variables
// 3. cleans the path, e.g. /a/b/../c -> /a/c
// Note, it has limitations, e.g. ~someuser/tmp will not be expanded
func expandPath(p string) string {
    if strings.HasPrefix(p, "~/") || strings.HasPrefix(p, "~\\") {
        if home := homeDir(); home != "" {
            p = home + p[1:]
        }
    }
    return path.Clean(os.ExpandEnv(p))
}

func homeDir() string {
    if home := os.Getenv("HOME"); home != "" {
        return home
    }
    if usr, err := user.Current(); err == nil {
        return usr.HomeDir
    }
    return ""
}

func detectMimeType(file string) string {
    if ext := filepath.Ext(file); ext != "" {
        return mime.TypeByExtension(ext)
    }
    f, err := os.Open(file)
    if err != nil {
        return ""
    }
    defer f.Close()
    buf := make([]byte, 512)
    if n, _ := f.Read(buf); n > 0 {
        return http.DetectContentType(buf)
    }
    return ""
}