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 (
    "bytes"
    "encoding/json"
    "fmt"
    "io"
    "io/ioutil"
    "log"
    "mime"
    "net/http"
    "os"
    "os/user"
    "path"
    "path/filepath"
    "strings"

    "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)
    )
    if len(args) != 1 {
        log.Fatal("need filename as the first and only argument")
    }

    var (
        file   = args[0]
        client = &client{api: bzzapi}
    )
    fi, err := os.Stat(expandPath(file))
    if err != nil {
        log.Fatal(err)
    }
    if fi.IsDir() {
        if !recursive {
            log.Fatal("argument is a directory and recursive upload is disabled")
        }
        if !wantManifest {
            log.Fatal("manifest is required for directory uploads")
        }
        mhash, err := client.uploadDirectory(file, defaultPath)
        if err != nil {
            log.Fatal(err)
        }
        fmt.Println(mhash)
        return
    }
    entry, err := client.uploadFile(file, fi)
    if err != nil {
        log.Fatalln("upload failed:", err)
    }
    mroot := manifest{[]manifestEntry{entry}}
    if !wantManifest {
        // Print the manifest. This is the only output to stdout.
        mrootJSON, _ := json.MarshalIndent(mroot, "", "  ")
        fmt.Println(string(mrootJSON))
        return
    }
    hash, err := client.uploadManifest(mroot)
    if err != nil {
        log.Fatalln("manifest upload failed:", 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 ""
}

// client wraps interaction with the swarm HTTP gateway.
type client struct {
    api string
}

// manifest is the JSON representation of a swarm manifest.
type manifestEntry struct {
    Hash        string `json:"hash,omitempty"`
    ContentType string `json:"contentType,omitempty"`
    Path        string `json:"path,omitempty"`
}

// manifest is the JSON representation of a swarm manifest.
type manifest struct {
    Entries []manifestEntry `json:"entries,omitempty"`
}

func (c *client) uploadDirectory(dir string, defaultPath string) (string, error) {
    mhash, err := c.postRaw("application/json", 2, ioutil.NopCloser(bytes.NewReader([]byte("{}"))))
    if err != nil {
        return "", fmt.Errorf("failed to upload empty manifest")
    }
    if len(defaultPath) > 0 {
        fi, err := os.Stat(defaultPath)
        if err != nil {
            return "", err
        }
        mhash, err = c.uploadToManifest(mhash, "", defaultPath, fi)
        if err != nil {
            return "", err
        }
    }
    prefix := filepath.ToSlash(filepath.Clean(dir)) + "/"
    err = filepath.Walk(dir, func(path string, fi os.FileInfo, err error) error {
        if err != nil || fi.IsDir() {
            return err
        }
        if !strings.HasPrefix(path, dir) {
            return fmt.Errorf("path %s outside directory %s", path, dir)
        }
        uripath := strings.TrimPrefix(filepath.ToSlash(filepath.Clean(path)), prefix)
        mhash, err = c.uploadToManifest(mhash, uripath, path, fi)
        return err
    })
    return mhash, err
}

func (c *client) uploadFile(file string, fi os.FileInfo) (manifestEntry, error) {
    hash, err := c.uploadFileContent(file, fi)
    m := manifestEntry{
        Hash:        hash,
        ContentType: mime.TypeByExtension(filepath.Ext(fi.Name())),
    }
    return m, err
}

func (c *client) uploadFileContent(file string, fi os.FileInfo) (string, error) {
    fd, err := os.Open(file)
    if err != nil {
        return "", err
    }
    defer fd.Close()
    log.Printf("uploading file %s (%d bytes)", file, fi.Size())
    return c.postRaw("application/octet-stream", fi.Size(), fd)
}

func (c *client) uploadManifest(m manifest) (string, error) {
    jsm, err := json.Marshal(m)
    if err != nil {
        panic(err)
    }
    log.Println("uploading manifest")
    return c.postRaw("application/json", int64(len(jsm)), ioutil.NopCloser(bytes.NewReader(jsm)))
}

func (c *client) uploadToManifest(mhash string, path string, fpath string, fi os.FileInfo) (string, error) {
    fd, err := os.Open(fpath)
    if err != nil {
        return "", err
    }
    defer fd.Close()
    log.Printf("uploading file %s (%d bytes) and adding path %v", fpath, fi.Size(), path)
    req, err := http.NewRequest("PUT", c.api+"/bzz:/"+mhash+"/"+path, fd)
    if err != nil {
        return "", err
    }
    req.Header.Set("content-type", mime.TypeByExtension(filepath.Ext(fi.Name())))
    req.ContentLength = fi.Size()
    resp, err := http.DefaultClient.Do(req)
    if err != nil {
        return "", err
    }
    defer resp.Body.Close()
    if resp.StatusCode >= 400 {
        return "", fmt.Errorf("bad status: %s", resp.Status)
    }
    content, err := ioutil.ReadAll(resp.Body)
    return string(content), err
}

func (c *client) postRaw(mimetype string, size int64, body io.ReadCloser) (string, error) {
    req, err := http.NewRequest("POST", c.api+"/bzzr:/", body)
    if err != nil {
        return "", err
    }
    req.Header.Set("content-type", mimetype)
    req.ContentLength = size
    resp, err := http.DefaultClient.Do(req)
    if err != nil {
        return "", err
    }
    defer resp.Body.Close()
    if resp.StatusCode >= 400 {
        return "", fmt.Errorf("bad status: %s", resp.Status)
    }
    content, err := ioutil.ReadAll(resp.Body)
    return string(content), err
}