// 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/>.
package client
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"mime"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/ethereum/go-ethereum/log"
)
var (
DefaultGateway = "http://localhost:8500"
DefaultClient = NewClient(DefaultGateway)
)
// Manifest represents a swarm manifest.
type Manifest struct {
Entries []ManifestEntry `json:"entries,omitempty"`
}
// ManifestEntry represents an entry in a swarm manifest.
type ManifestEntry struct {
Hash string `json:"hash,omitempty"`
ContentType string `json:"contentType,omitempty"`
Path string `json:"path,omitempty"`
}
func NewClient(gateway string) *Client {
return &Client{
Gateway: gateway,
}
}
// Client wraps interaction with a swarm HTTP gateway.
type Client struct {
Gateway string
}
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, mimetype_hint string) (ManifestEntry, error) {
var mimetype string
hash, err := c.uploadFileContent(file, fi)
if mimetype_hint != "" {
mimetype = mimetype_hint
log.Info("Mime type set by override", "mime", mimetype)
} else {
ext := filepath.Ext(file)
log.Info("Ext", "ext", ext, "file", file)
if ext != "" {
mimetype = mime.TypeByExtension(filepath.Ext(fi.Name()))
log.Info("Mime type set by fileextension", "mime", mimetype, "ext", filepath.Ext(file))
} else {
f, err := os.Open(file)
if err == nil {
first512 := make([]byte, 512)
fread, _ := f.ReadAt(first512, 0)
if fread > 0 {
mimetype = http.DetectContentType(first512[:fread])
log.Info("Mime type set by autodetection", "mime", mimetype)
}
}
f.Close()
}
}
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.Info("Uploading swarm content", "file", file, "bytes", 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.Info("Uploading swarm 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.Info("Uploading swarm content and path", "file", fpath, "bytes", fi.Size(), "path", path)
req, err := http.NewRequest("PUT", c.Gateway+"/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.Gateway+"/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
}
func (c *Client) DownloadManifest(mhash string) (Manifest, error) {
mroot := Manifest{}
req, err := http.NewRequest("GET", c.Gateway+"/bzzr:/"+mhash, nil)
if err != nil {
return mroot, err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return mroot, err
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return mroot, fmt.Errorf("bad status: %s", resp.Status)
}
content, err := ioutil.ReadAll(resp.Body)
err = json.Unmarshal(content, &mroot)
if err != nil {
return mroot, fmt.Errorf("Manifest %v is malformed: %v", mhash, err)
}
return mroot, err
}
// ManifestFileList downloads the manifest with the given hash and generates a
// list of files and directory prefixes which have the specified prefix.
//
// For example, if the manifest represents the following directory structure:
//
// file1.txt
// file2.txt
// dir1/file3.txt
// dir1/dir2/file4.txt
//
// Then:
//
// - a prefix of "" would return [dir1/, file1.txt, file2.txt]
// - a prefix of "file" would return [file1.txt, file2.txt]
// - a prefix of "dir1/" would return [dir1/dir2/, dir1/file3.txt]
func (c *Client) ManifestFileList(hash, prefix string) (entries []ManifestEntry, err error) {
manifest, err := c.DownloadManifest(hash)
if err != nil {
return nil, err
}
// handleFile handles a manifest entry which is a direct reference to a
// file (i.e. it is not a swarm manifest)
handleFile := func(entry ManifestEntry) {
// ignore the file if it doesn't have the specified prefix
if !strings.HasPrefix(entry.Path, prefix) {
return
}
// if the path after the prefix contains a directory separator,
// add a directory prefix to the entries, otherwise add the
// file
suffix := strings.TrimPrefix(entry.Path, prefix)
if sepIndex := strings.Index(suffix, "/"); sepIndex > -1 {
entries = append(entries, ManifestEntry{
Path: prefix + suffix[:sepIndex+1],
ContentType: "DIR",
})
} else {
if entry.Path == "" {
entry.Path = "/"
}
entries = append(entries, entry)
}
}
// handleManifest handles a manifest entry which is a reference to
// another swarm manifest.
handleManifest := func(entry ManifestEntry) error {
// if the manifest's path is a prefix of the specified prefix
// then just recurse into the manifest by stripping its path
// from the prefix
if strings.HasPrefix(prefix, entry.Path) {
subPrefix := strings.TrimPrefix(prefix, entry.Path)
subEntries, err := c.ManifestFileList(entry.Hash, subPrefix)
if err != nil {
return err
}
// prefix the manifest's path to the sub entries and
// add them to the returned entries
for i, subEntry := range subEntries {
subEntry.Path = entry.Path + subEntry.Path
subEntries[i] = subEntry
}
entries = append(entries, subEntries...)
return nil
}
// if the manifest's path has the specified prefix, then if the
// path after the prefix contains a directory separator, add a
// directory prefix to the entries, otherwise recurse into the
// manifest
if strings.HasPrefix(entry.Path, prefix) {
suffix := strings.TrimPrefix(entry.Path, prefix)
sepIndex := strings.Index(suffix, "/")
if sepIndex > -1 {
entries = append(entries, ManifestEntry{
Path: prefix + suffix[:sepIndex+1],
ContentType: "DIR",
})
return nil
}
subEntries, err := c.ManifestFileList(entry.Hash, "")
if err != nil {
return err
}
// prefix the manifest's path to the sub entries and
// add them to the returned entries
for i, subEntry := range subEntries {
subEntry.Path = entry.Path + subEntry.Path
subEntries[i] = subEntry
}
entries = append(entries, subEntries...)
return nil
}
return nil
}
for _, entry := range manifest.Entries {
if entry.ContentType == "application/bzz-manifest+json" {
if err := handleManifest(entry); err != nil {
return nil, err
}
} else {
handleFile(entry)
}
}
return
}
