cmd/swarm: manifest manipulation commands (#3645)

3 files changed, 423 insertions, 0 deletions

diff --git a/cmd/swarm/main.go b/cmd/swarm/main.go
index 34b3f71c4..546c646f1 100644
--- a/cmd/swarm/main.go
+++ b/cmd/swarm/main.go
@@ -154,6 +154,43 @@ The output of this command is supposed to be machine-readable.
 Prints the swarm hash of file or directory.
 `,
 		},
+		{
+			Name:      "manifest",
+			Usage:     "update a MANIFEST",
+			ArgsUsage: "manifest COMMAND",
+			Description: `
+Updates a MANIFEST by adding/removing/updating the hash of a path.
+`,
+			Subcommands: []cli.Command{
+				{
+					Action:    add,
+					Name:      "add",
+					Usage:     "add a new path to the manifest",
+					ArgsUsage: "<MANIFEST> <path> <hash> [<content-type>]",
+					Description: `
+Adds a new path to the manifest
+`,
+				},
+				{
+					Action:    update,
+					Name:      "update",
+					Usage:     "update the hash for an already existing path in the manifest",
+					ArgsUsage: "<MANIFEST> <path> <newhash> [<newcontent-type>]",
+					Description: `
+Update the hash for an already existing path in the manifest
+`,
+				},
+				{
+					Action:    remove,
+					Name:      "remove",
+					Usage:     "removes a path from the manifest",
+					ArgsUsage: "<MANIFEST> <path>",
+					Description: `
+Removes a path from the manifest
+`,
+				},
+			},
+		},
 	}
 
 	app.Flags = []cli.Flag{
diff --git a/cmd/swarm/manifest.go b/cmd/swarm/manifest.go
new file mode 100644
index 000000000..0de0d69bb
--- /dev/null
+++ b/cmd/swarm/manifest.go
@@ -0,0 +1,360 @@
+// 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  MANIFEST update
+package main
+
+import (
+	"gopkg.in/urfave/cli.v1"
+	"log"
+	"mime"
+	"path/filepath"
+	"strings"
+	"fmt"
+	"encoding/json"
+)
+
+func add(ctx *cli.Context) {
+
+	args := ctx.Args()
+	if len(args) < 3 {
+		log.Fatal("need atleast three arguments <MHASH> <path> <HASH> [<content-type>]")
+	}
+
+	var (
+		mhash  = args[0]
+		path   = args[1]
+		hash   = args[2]
+
+		ctype  string
+		wantManifest = ctx.GlobalBoolT(SwarmWantManifestFlag.Name)
+		mroot  manifest
+	)
+
+
+	if len(args) > 3 {
+		ctype = args[3]
+	} else {
+		ctype = mime.TypeByExtension(filepath.Ext(path))
+	}
+
+	newManifest := addEntryToManifest (ctx, mhash, path, hash, ctype)
+	fmt.Println(newManifest)
+
+	if !wantManifest {
+		// Print the manifest. This is the only output to stdout.
+		mrootJSON, _ := json.MarshalIndent(mroot, "", "  ")
+		fmt.Println(string(mrootJSON))
+		return
+	}
+}
+
+func update(ctx *cli.Context) {
+
+	args := ctx.Args()
+	if len(args) < 3 {
+		log.Fatal("need atleast three arguments <MHASH> <path> <HASH>")
+	}
+
+	var (
+		mhash  = args[0]
+		path   = args[1]
+		hash   = args[2]
+
+		ctype  string
+		wantManifest = ctx.GlobalBoolT(SwarmWantManifestFlag.Name)
+		mroot  manifest
+	)
+	if len(args) > 3 {
+		ctype = args[3]
+	} else {
+		ctype = mime.TypeByExtension(filepath.Ext(path))
+	}
+
+	newManifest := updateEntryInManifest (ctx, mhash, path, hash, ctype)
+	fmt.Println(newManifest)
+
+	if !wantManifest {
+		// Print the manifest. This is the only output to stdout.
+		mrootJSON, _ := json.MarshalIndent(mroot, "", "  ")
+		fmt.Println(string(mrootJSON))
+		return
+	}
+}
+
+func remove(ctx *cli.Context) {
+	args := ctx.Args()
+	if len(args) < 2 {
+		log.Fatal("need atleast two arguments <MHASH> <path>")
+	}
+
+	var (
+		mhash  = args[0]
+		path   = args[1]
+
+		wantManifest = ctx.GlobalBoolT(SwarmWantManifestFlag.Name)
+		mroot  manifest
+	)
+
+	newManifest := removeEntryFromManifest (ctx, mhash, path)
+	fmt.Println(newManifest)
+
+	if !wantManifest {
+		// Print the manifest. This is the only output to stdout.
+		mrootJSON, _ := json.MarshalIndent(mroot, "", "  ")
+		fmt.Println(string(mrootJSON))
+		return
+	}
+}
+
+func addEntryToManifest(ctx *cli.Context, mhash , path, hash , ctype string)  string {
+
+	var (
+		bzzapi = strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
+		client = &client{api: bzzapi}
+		longestPathEntry = manifestEntry{
+			Path:        "",
+			Hash:        "",
+			ContentType:  "",
+		}
+	)
+
+	mroot, err := client.downloadManifest(mhash)
+	if err != nil {
+		log.Fatalln("manifest download failed:", err)
+	}
+
+	//TODO: check if the "hash" to add is valid and present in swarm
+	_, err = client.downloadManifest(hash)
+	if err != nil {
+		log.Fatalln("hash to add is not present:", 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 {
+			log.Fatal(path, "Already present, not adding anything")
+		}else {
+			if entry.ContentType == "application/bzz-manifest+json" {
+				prfxlen := strings.HasPrefix(path, entry.Path)
+				if prfxlen && len(path) > len(longestPathEntry.Path) {
+					longestPathEntry = entry
+				}
+			}
+		}
+	}
+
+	if longestPathEntry.Path != "" {
+		// Load the child Manifest add the entry there
+		newPath := path[len(longestPathEntry.Path):]
+		newHash := addEntryToManifest (ctx, longestPathEntry.Hash, newPath, hash, ctype)
+
+		// Replace the hash for parent Manifests
+		newMRoot := manifest{}
+		for _, entry := range mroot.Entries {
+			if longestPathEntry.Path == entry.Path {
+				entry.Hash = newHash
+			}
+			newMRoot.Entries = append(newMRoot.Entries, entry)
+		}
+		mroot = newMRoot
+	} else {
+		// Add the entry in the leaf Manifest
+		newEntry := manifestEntry{
+			Path:        path,
+			Hash:        hash,
+			ContentType: ctype,
+		}
+		mroot.Entries = append(mroot.Entries, newEntry)
+	}
+
+
+	newManifestHash, err := client.uploadManifest(mroot)
+	if err != nil {
+		log.Fatalln("manifest upload failed:", err)
+	}
+	return newManifestHash
+
+
+
+}
+
+func updateEntryInManifest(ctx *cli.Context, mhash , path, hash , ctype string) string {
+
+	var (
+		bzzapi = strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
+		client = &client{api: bzzapi}
+		newEntry = manifestEntry{
+			Path:        "",
+			Hash:        "",
+			ContentType:  "",
+		}
+		longestPathEntry = manifestEntry{
+			Path:        "",
+			Hash:        "",
+			ContentType:  "",
+		}
+	)
+
+	mroot, err := client.downloadManifest(mhash)
+	if err != nil {
+		log.Fatalln("manifest download failed:", err)
+	}
+
+	//TODO: check if the "hash" with which to update is valid and present in swarm
+
+
+	// See if we path is in this Manifest or do we have to dig deeper
+	for _, entry := range mroot.Entries {
+		if path == entry.Path {
+			newEntry = entry
+		}else {
+			if entry.ContentType == "application/bzz-manifest+json" {
+				prfxlen := strings.HasPrefix(path, entry.Path)
+				if prfxlen && len(path) > len(longestPathEntry.Path) {
+					longestPathEntry = entry
+				}
+			}
+		}
+	}
+
+	if longestPathEntry.Path == "" && newEntry.Path == "" {
+		log.Fatal(path, " Path not present in the Manifest, not setting anything")
+	}
+
+	if longestPathEntry.Path != "" {
+		// Load the child Manifest add the entry there
+		newPath := path[len(longestPathEntry.Path):]
+		newHash := updateEntryInManifest (ctx, longestPathEntry.Hash, newPath, hash, ctype)
+
+		// Replace the hash for parent Manifests
+		newMRoot := manifest{}
+		for _, entry := range mroot.Entries {
+			if longestPathEntry.Path == entry.Path {
+				entry.Hash = newHash
+			}
+			newMRoot.Entries = append(newMRoot.Entries, entry)
+
+		}
+		mroot = newMRoot
+	}
+
+	if newEntry.Path != "" {
+		// Replace the hash for leaf Manifest
+		newMRoot := manifest{}
+		for _, entry := range mroot.Entries {
+			if newEntry.Path == entry.Path {
+				myEntry := manifestEntry{
+					Path:        entry.Path,
+					Hash:        hash,
+					ContentType: ctype,
+				}
+				newMRoot.Entries = append(newMRoot.Entries, myEntry)
+			} else {
+				newMRoot.Entries = append(newMRoot.Entries, entry)
+			}
+		}
+		mroot = newMRoot
+	}
+
+
+	newManifestHash, err := client.uploadManifest(mroot)
+	if err != nil {
+		log.Fatalln("manifest upload failed:", err)
+	}
+	return newManifestHash
+}
+
+func removeEntryFromManifest(ctx *cli.Context, mhash , path string) string {
+
+	var (
+		bzzapi = strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
+		client = &client{api: bzzapi}
+		entryToRemove = manifestEntry{
+			Path:        "",
+			Hash:        "",
+			ContentType:  "",
+		}
+		longestPathEntry = manifestEntry{
+			Path:        "",
+			Hash:        "",
+			ContentType:  "",
+		}
+	)
+
+	mroot, err := client.downloadManifest(mhash)
+	if err != nil {
+		log.Fatalln("manifest download failed:", 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 == "application/bzz-manifest+json" {
+				prfxlen := strings.HasPrefix(path, entry.Path)
+				if prfxlen && len(path) > len(longestPathEntry.Path) {
+					longestPathEntry = entry
+				}
+			}
+		}
+	}
+
+	if longestPathEntry.Path == "" && entryToRemove.Path == "" {
+		log.Fatal(path, "Path not present in the Manifest, not removing anything")
+	}
+
+	if longestPathEntry.Path != "" {
+		// Load the child Manifest remove the entry there
+		newPath := path[len(longestPathEntry.Path):]
+		newHash := removeEntryFromManifest (ctx, longestPathEntry.Hash, newPath)
+
+		// Replace the hash for parent Manifests
+		newMRoot := 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 := manifest{}
+		for _, entry := range mroot.Entries {
+			if entryToRemove.Path != entry.Path {
+				newMRoot.Entries = append(newMRoot.Entries, entry)
+			}
+		}
+		mroot = newMRoot
+	}
+
+
+	newManifestHash, err := client.uploadManifest(mroot)
+	if err != nil {
+		log.Fatalln("manifest upload failed:", err)
+	}
+	return newManifestHash
+
+
+}
+
diff --git a/cmd/swarm/upload.go b/cmd/swarm/upload.go
index d8039d45b..871713b2d 100644
--- a/cmd/swarm/upload.go
+++ b/cmd/swarm/upload.go
@@ -229,3 +229,29 @@ func (c *client) postRaw(mimetype string, size int64, body io.ReadCloser) (strin
 	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.api + "/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
+}
\ No newline at end of file