// Copyright 2017 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 MANIFEST update
package main
import (
"fmt"
"os"
"strings"
"github.com/dexon-foundation/dexon/cmd/utils"
"github.com/dexon-foundation/dexon/swarm/api"
swarm "github.com/dexon-foundation/dexon/swarm/api/client"
"gopkg.in/urfave/cli.v1"
)
var manifestCommand = cli.Command{
Name: "manifest",
CustomHelpTemplate: helpTemplate,
Usage: "perform operations on swarm manifests",
ArgsUsage: "COMMAND",
Description: "Updates a MANIFEST by adding/removing/updating the hash of a path.\nCOMMAND could be: add, update, remove",
Subcommands: []cli.Command{
{
Action: manifestAdd,
CustomHelpTemplate: helpTemplate,
Name: "add",
Usage: "add a new path to the manifest",
ArgsUsage: "<MANIFEST> <path> <hash>",
Description: "Adds a new path to the manifest",
},
{
Action: manifestUpdate,
CustomHelpTemplate: helpTemplate,
Name: "update",
Usage: "update the hash for an already existing path in the manifest",
ArgsUsage: "<MANIFEST> <path> <newhash>",
Description: "Update the hash for an already existing path in the manifest",
},
{
Action: manifestRemove,
CustomHelpTemplate: helpTemplate,
Name: "remove",
Usage: "removes a path from the manifest",
ArgsUsage: "<MANIFEST> <path>",
Description: "Removes a path from the manifest",
},
},
}
// manifestAdd adds a new entry to the manifest at the given path.
// New entry hash, the last argument, must be the hash of a manifest
// with only one entry, which meta-data will be added to the original manifest.
// On success, this function will print new (updated) manifest's hash.
func manifestAdd(ctx *cli.Context) {
args := ctx.Args()
if len(args) != 3 {
utils.Fatalf("Need exactly three arguments <MHASH> <path> <HASH>")
}
var (
mhash = args[0]
path = args[1]
hash = args[2]
)
bzzapi := strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
client := swarm.NewClient(bzzapi)
m, _, err := client.DownloadManifest(hash)
if err != nil {
utils.Fatalf("Error downloading manifest to add: %v", err)
}
l := len(m.Entries)
if l == 0 {
utils.Fatalf("No entries in manifest %s", hash)
} else if l > 1 {
utils.Fatalf("Too many entries in manifest %s", hash)
}
newManifest := addEntryToManifest(client, mhash, path, m.Entries[0])
fmt.Println(newManifest)
}
// manifestUpdate replaces an existing entry of the manifest at the given path.
// New entry hash, the last argument, must be the hash of a manifest
// with only one entry, which meta-data will be added to the original manifest.
// On success, this function will print hash of the updated manifest.
func manifestUpdate(ctx *cli.Context) {
args := ctx.Args()
if len(args) != 3 {
utils.Fatalf("Need exactly three arguments <MHASH> <path> <HASH>")
}
var (
mhash = args[0]
path = args[1]
hash = args[2]
)
bzzapi := strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
client := swarm.NewClient(bzzapi)
m, _, err := client.DownloadManifest(hash)
if err != nil {
utils.Fatalf("Error downloading manifest to update: %v", err)
}
l := len(m.Entries)
if l == 0 {
utils.Fatalf("No entries in manifest %s", hash)
} else if l > 1 {
utils.Fatalf("Too many entries in manifest %s", hash)
}
newManifest, _, defaultEntryUpdated := updateEntryInManifest(client, mhash, path, m.Entries[0], true)
if defaultEntryUpdated {
// Print informational message to stderr
// allowing the user to get the new manifest hash from stdout
// without the need to parse the complete output.
fmt.Fprintln(os.Stderr, "Manifest default entry is updated, too")
}
fmt.Println(newManifest)
}
// manifestRemove removes an existing entry of the manifest at the given path.
// On success, this function will print hash of the manifest which does not
// contain the path.
func manifestRemove(ctx *cli.Context) {
args := ctx.Args()
if len(args) != 2 {
utils.Fatalf("Need exactly two arguments <MHASH> <path>")
}
var (
mhash = args[0]
path = args[1]
)
bzzapi := strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
client := swarm.NewClient(bzzapi)
newManifest := removeEntryFromManifest(client, mhash, path)
fmt.Println(newManifest)
}
func addEntryToManifest(client *swarm.Client, mhash, path string, entry api.ManifestEntry) string {
var longestPathEntry = api.ManifestEntry{}
mroot, isEncrypted, err := client.DownloadManifest(mhash)
if err != nil {
utils.Fatalf("Manifest download failed: %v", err)
}
// See if we path is in this Manifest or do we have to dig deeper
for _, e := range mroot.Entries {
if path == e.Path {
utils.Fatalf("Path %s already present, not adding anything", path)
} else {
if e.ContentType == api.ManifestType {
prfxlen := strings.HasPrefix(path, e.Path)
if prfxlen && len(path) > len(longestPathEntry.Path) {
longestPathEntry = e
}
}
}
}
if longestPathEntry.Path != "" {
// Load the child Manifest add the entry there
newPath := path[len(longestPathEntry.Path):]
newHash := addEntryToManifest(client, longestPathEntry.Hash, newPath, entry)
// Replace the hash for parent Manifests
newMRoot := &api.Manifest{}
for _, e := range mroot.Entries {
if longestPathEntry.Path == e.Path {
e.Hash = newHash
}
newMRoot.Entries = append(newMRoot.Entries, e)
}
mroot = newMRoot
} else {
// Add the entry in the leaf Manifest
entry.Path = path
mroot.Entries = append(mroot.Entries, entry)
}
newManifestHash, err := client.UploadManifest(mroot, isEncrypted)
if err != nil {
utils.Fatalf("Manifest upload failed: %v", err)
}
return newManifestHash
}
// updateEntryInManifest updates an existing entry o path with a new one in the manifest with provided mhash
// finding the path recursively through all nested manifests. Argument isRoot is used for default
// entry update detection. If the updated entry has the same hash as the default entry, then the
// default entry in root manifest will be updated too.
// Returned values are the new manifest hash, hash of the entry that was replaced by the new entry and
// a a bool that is true if default entry is updated.
func updateEntryInManifest(client *swarm.Client, mhash, path string, entry api.ManifestEntry, isRoot bool) (newManifestHash, oldHash string, defaultEntryUpdated bool) {
var (
newEntry = api.ManifestEntry{}
longestPathEntry = api.ManifestEntry{}
)
mroot, isEncrypted, err := client.DownloadManifest(mhash)
if err != nil {
utils.Fatalf("Manifest download failed: %v", err)
}
// See if we path is in this Manifest or do we have to dig deeper
for _, e := range mroot.Entries {
if path == e.Path {
newEntry = e
// keep the reference of the hash of the entry that should be replaced
// for default entry detection
oldHash = e.Hash
} else {
if e.ContentType == api.ManifestType {
prfxlen := strings.HasPrefix(path, e.Path)
if prfxlen && len(path) > len(longestPathEntry.Path) {
longestPathEntry = e
}
}
}
}
if longestPathEntry.Path == "" && newEntry.Path == "" {
utils.Fatalf("Path %s not present in the Manifest, not setting anything", path)
}
if longestPathEntry.Path != "" {
// Load the child Manifest add the entry there
newPath := path[len(longestPathEntry.Path):]
var newHash string
newHash, oldHash, _ = updateEntryInManifest(client, longestPathEntry.Hash, newPath, entry, false)
// Replace the hash for parent Manifests
newMRoot := &api.Manifest{}
for _, e := range mroot.Entries {
if longestPathEntry.Path == e.Path {
e.Hash = newHash
}
newMRoot.Entries = append(newMRoot.Entries, e)
}
mroot = newMRoot
}
// update the manifest if the new entry is found and
// check if default entry should be updated
if newEntry.Path != "" || isRoot {
// Replace the hash for leaf Manifest
newMRoot := &api.Manifest{}
for _, e := range mroot.Entries {
if newEntry.Path == e.Path {
entry.Path = e.Path
newMRoot.Entries = append(newMRoot.Entries, entry)
} else if isRoot && e.Path == "" && e.Hash == oldHash {
entry.Path = e.Path
newMRoot.Entries = append(newMRoot.Entries, entry)
defaultEntryUpdated = true
} else {
newMRoot.Entries = append(newMRoot.Entries, e)
}
}
mroot = newMRoot
}
newManifestHash, err = client.UploadManifest(mroot, isEncrypted)
if err != nil {
utils.Fatalf("Manifest upload failed: %v", err)
}
return newManifestHash, oldHash, defaultEntryUpdated
}
func removeEntryFromManifest(client *swarm.Client, mhash, path string) string {
var (
entryToRemove = api.ManifestEntry{}
longestPathEntry = api.ManifestEntry{}
)
mroot, isEncrypted, err := client.DownloadManifest(mhash)
if err != nil {
utils.Fatalf("Manifest download failed: %v", err)
}
// See if we path is in this Manifest or do we have to dig deeper
for _, entry := range mroot.Entries {
if path == entry.Path {
entryToRemove = entry
} else {
if entry.ContentType == api.ManifestType {
prfxlen := strings.HasPrefix(path, entry.Path)
if prfxlen && len(path) > len(longestPathEntry.Path) {
longestPathEntry = entry
}
}
}
}
if longestPathEntry.Path == "" && entryToRemove.Path == "" {
utils.Fatalf("Path %s not present in the Manifest, not removing anything", path)
}
if longestPathEntry.Path != "" {
// Load the child Manifest remove the entry there
newPath := path[len(longestPathEntry.Path):]
newHash := removeEntryFromManifest(client, longestPathEntry.Hash, newPath)
// Replace the hash for parent Manifests
newMRoot := &api.Manifest{}
for _, entry := range mroot.Entries {
if longestPathEntry.Path == entry.Path {
entry.Hash = newHash
}
newMRoot.Entries = append(newMRoot.Entries, entry)
}
mroot = newMRoot
}
if entryToRemove.Path != "" {
// remove the entry in this Manifest
newMRoot := &api.Manifest{}
for _, entry := range mroot.Entries {
if entryToRemove.Path != entry.Path {
newMRoot.Entries = append(newMRoot.Entries, entry)
}
}
mroot = newMRoot
}
newManifestHash, err := client.UploadManifest(mroot, isEncrypted)
if err != nil {
utils.Fatalf("Manifest upload failed: %v", err)
}
return newManifestHash
}
