forked from cerc-io/ipld-eth-server
239 lines
8.2 KiB
Go
239 lines
8.2 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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// Command feed allows the user to create and update signed Swarm feeds
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package main
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import (
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"fmt"
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"strings"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/cmd/utils"
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swarm "github.com/ethereum/go-ethereum/swarm/api/client"
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"github.com/ethereum/go-ethereum/swarm/storage/feed"
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"gopkg.in/urfave/cli.v1"
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)
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var feedCommand = cli.Command{
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CustomHelpTemplate: helpTemplate,
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Name: "feed",
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Usage: "(Advanced) Create and update Swarm Feeds",
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ArgsUsage: "<create|update|info>",
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Description: "Works with Swarm Feeds",
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Subcommands: []cli.Command{
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{
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Action: feedCreateManifest,
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CustomHelpTemplate: helpTemplate,
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Name: "create",
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Usage: "creates and publishes a new feed manifest",
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Description: `creates and publishes a new feed manifest pointing to a specified user's updates about a particular topic.
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The feed topic can be built in the following ways:
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* use --topic to set the topic to an arbitrary binary hex string.
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* use --name to set the topic to a human-readable name.
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For example --name could be set to "profile-picture", meaning this feed allows to get this user's current profile picture.
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* use both --topic and --name to create named subtopics.
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For example, --topic could be set to an Ethereum contract address and --name could be set to "comments", meaning
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this feed tracks a discussion about that contract.
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The --user flag allows to have this manifest refer to a user other than yourself. If not specified,
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it will then default to your local account (--bzzaccount)`,
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Flags: []cli.Flag{SwarmFeedNameFlag, SwarmFeedTopicFlag, SwarmFeedUserFlag},
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},
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{
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Action: feedUpdate,
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CustomHelpTemplate: helpTemplate,
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Name: "update",
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Usage: "updates the content of an existing Swarm Feed",
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ArgsUsage: "<0x Hex data>",
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Description: `publishes a new update on the specified topic
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The feed topic can be built in the following ways:
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* use --topic to set the topic to an arbitrary binary hex string.
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* use --name to set the topic to a human-readable name.
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For example --name could be set to "profile-picture", meaning this feed allows to get this user's current profile picture.
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* use both --topic and --name to create named subtopics.
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For example, --topic could be set to an Ethereum contract address and --name could be set to "comments", meaning
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this feed tracks a discussion about that contract.
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If you have a manifest, you can specify it with --manifest to refer to the feed,
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instead of using --topic / --name
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`,
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Flags: []cli.Flag{SwarmFeedManifestFlag, SwarmFeedNameFlag, SwarmFeedTopicFlag},
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},
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{
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Action: feedInfo,
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CustomHelpTemplate: helpTemplate,
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Name: "info",
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Usage: "obtains information about an existing Swarm feed",
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Description: `obtains information about an existing Swarm feed
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The topic can be specified directly with the --topic flag as an hex string
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If no topic is specified, the default topic (zero) will be used
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The --name flag can be used to specify subtopics with a specific name.
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The --user flag allows to refer to a user other than yourself. If not specified,
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it will then default to your local account (--bzzaccount)
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If you have a manifest, you can specify it with --manifest instead of --topic / --name / ---user
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to refer to the feed`,
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Flags: []cli.Flag{SwarmFeedManifestFlag, SwarmFeedNameFlag, SwarmFeedTopicFlag, SwarmFeedUserFlag},
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},
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},
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}
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func NewGenericSigner(ctx *cli.Context) feed.Signer {
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return feed.NewGenericSigner(getPrivKey(ctx))
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}
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func getTopic(ctx *cli.Context) (topic feed.Topic) {
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var name = ctx.String(SwarmFeedNameFlag.Name)
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var relatedTopic = ctx.String(SwarmFeedTopicFlag.Name)
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var relatedTopicBytes []byte
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var err error
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if relatedTopic != "" {
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relatedTopicBytes, err = hexutil.Decode(relatedTopic)
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if err != nil {
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utils.Fatalf("Error parsing topic: %s", err)
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}
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}
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topic, err = feed.NewTopic(name, relatedTopicBytes)
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if err != nil {
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utils.Fatalf("Error parsing topic: %s", err)
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}
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return topic
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}
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// swarm feed create <frequency> [--name <name>] [--data <0x Hexdata> [--multihash=false]]
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// swarm feed update <Manifest Address or ENS domain> <0x Hexdata> [--multihash=false]
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// swarm feed info <Manifest Address or ENS domain>
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func feedCreateManifest(ctx *cli.Context) {
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var (
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bzzapi = strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
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client = swarm.NewClient(bzzapi)
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)
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newFeedUpdateRequest := feed.NewFirstRequest(getTopic(ctx))
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newFeedUpdateRequest.Feed.User = feedGetUser(ctx)
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manifestAddress, err := client.CreateFeedWithManifest(newFeedUpdateRequest)
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if err != nil {
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utils.Fatalf("Error creating feed manifest: %s", err.Error())
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return
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}
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fmt.Println(manifestAddress) // output manifest address to the user in a single line (useful for other commands to pick up)
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}
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func feedUpdate(ctx *cli.Context) {
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args := ctx.Args()
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var (
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bzzapi = strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
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client = swarm.NewClient(bzzapi)
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manifestAddressOrDomain = ctx.String(SwarmFeedManifestFlag.Name)
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)
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if len(args) < 1 {
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fmt.Println("Incorrect number of arguments")
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cli.ShowCommandHelpAndExit(ctx, "update", 1)
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return
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}
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signer := NewGenericSigner(ctx)
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data, err := hexutil.Decode(args[0])
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if err != nil {
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utils.Fatalf("Error parsing data: %s", err.Error())
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return
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}
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var updateRequest *feed.Request
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var query *feed.Query
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if manifestAddressOrDomain == "" {
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query = new(feed.Query)
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query.User = signer.Address()
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query.Topic = getTopic(ctx)
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}
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// Retrieve a feed update request
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updateRequest, err = client.GetFeedRequest(query, manifestAddressOrDomain)
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if err != nil {
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utils.Fatalf("Error retrieving feed status: %s", err.Error())
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}
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// Check that the provided signer matches the request to sign
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if updateRequest.User != signer.Address() {
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utils.Fatalf("Signer address does not match the update request")
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}
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// set the new data
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updateRequest.SetData(data)
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// sign update
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if err = updateRequest.Sign(signer); err != nil {
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utils.Fatalf("Error signing feed update: %s", err.Error())
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}
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// post update
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err = client.UpdateFeed(updateRequest)
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if err != nil {
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utils.Fatalf("Error updating feed: %s", err.Error())
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return
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}
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}
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func feedInfo(ctx *cli.Context) {
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var (
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bzzapi = strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
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client = swarm.NewClient(bzzapi)
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manifestAddressOrDomain = ctx.String(SwarmFeedManifestFlag.Name)
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)
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var query *feed.Query
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if manifestAddressOrDomain == "" {
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query = new(feed.Query)
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query.Topic = getTopic(ctx)
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query.User = feedGetUser(ctx)
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}
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metadata, err := client.GetFeedRequest(query, manifestAddressOrDomain)
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if err != nil {
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utils.Fatalf("Error retrieving feed metadata: %s", err.Error())
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return
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}
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encodedMetadata, err := metadata.MarshalJSON()
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if err != nil {
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utils.Fatalf("Error encoding metadata to JSON for display:%s", err)
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}
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fmt.Println(string(encodedMetadata))
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}
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func feedGetUser(ctx *cli.Context) common.Address {
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var user = ctx.String(SwarmFeedUserFlag.Name)
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if user != "" {
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return common.HexToAddress(user)
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}
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pk := getPrivKey(ctx)
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if pk == nil {
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utils.Fatalf("Cannot read private key. Must specify --user or --bzzaccount")
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}
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return crypto.PubkeyToAddress(pk.PublicKey)
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}
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