swarm: plan bee for content storage and distribution on web3

This change imports the Swarm protocol codebase. Compared to the 'swarm'
branch, a few mostly cosmetic changes had to be made:

* The various redundant log message prefixes are gone.
* All files now have LGPLv3 license headers.
* Minor code changes were needed to please go vet and make the tests
  pass on Windows.
* Further changes were required to adapt to the go-ethereum develop
  branch and its new Go APIs.

Some code has not (yet) been brought over:

* swarm/cmd/bzzhash: will reappear as cmd/bzzhash later
* swarm/cmd/bzzup.sh: will be reimplemented in cmd/bzzup
* swarm/cmd/makegenesis: will reappear somehow
* swarm/examples/album: will move to a separate repository
* swarm/examples/filemanager: ditto
* swarm/examples/files: will not be merged
* swarm/test/*: will not be merged
* swarm/services/swear: will reappear as contracts/swear when needed

1 files changed, 132 insertions, 0 deletions

diff --git a/swarm/api/config.go b/swarm/api/config.go
new file mode 100644
index 000000000..730755c43
--- /dev/null
+++ b/swarm/api/config.go
@@ -0,0 +1,132 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package api
+
+import (
+	"crypto/ecdsa"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/swarm/network"
+	"github.com/ethereum/go-ethereum/swarm/services/swap"
+	"github.com/ethereum/go-ethereum/swarm/storage"
+)
+
+const (
+	port = "8500"
+)
+
+//  by default ens root is  north internal
+var (
+	toyNetEnsRoot = common.HexToAddress("0xd344889e0be3e9ef6c26b0f60ef66a32e83c1b69")
+)
+
+// separate bzz directories
+// allow several bzz nodes running in parallel
+type Config struct {
+	// serialised/persisted fields
+	*storage.StoreParams
+	*storage.ChunkerParams
+	*network.HiveParams
+	Swap *swap.SwapParams
+	*network.SyncParams
+	Path      string
+	Port      string
+	PublicKey string
+	BzzKey    string
+	EnsRoot   common.Address
+}
+
+// config is agnostic to where private key is coming from
+// so managing accounts is outside swarm and left to wrappers
+func NewConfig(path string, contract common.Address, prvKey *ecdsa.PrivateKey) (self *Config, err error) {
+
+	address := crypto.PubkeyToAddress(prvKey.PublicKey) // default beneficiary address
+	dirpath := filepath.Join(path, common.Bytes2Hex(address.Bytes()))
+	err = os.MkdirAll(dirpath, os.ModePerm)
+	if err != nil {
+		return
+	}
+	confpath := filepath.Join(dirpath, "config.json")
+	var data []byte
+	pubkey := crypto.FromECDSAPub(&prvKey.PublicKey)
+	pubkeyhex := common.ToHex(pubkey)
+	keyhex := crypto.Sha3Hash(pubkey).Hex()
+
+	self = &Config{
+		SyncParams:    network.NewSyncParams(dirpath),
+		HiveParams:    network.NewHiveParams(dirpath),
+		ChunkerParams: storage.NewChunkerParams(),
+		StoreParams:   storage.NewStoreParams(dirpath),
+		Port:          port,
+		Path:          dirpath,
+		Swap:          swap.DefaultSwapParams(contract, prvKey),
+		PublicKey:     pubkeyhex,
+		BzzKey:        keyhex,
+		EnsRoot:       toyNetEnsRoot,
+	}
+	data, err = ioutil.ReadFile(confpath)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			return
+		}
+		// file does not exist
+		// write out config file
+		err = self.Save()
+		if err != nil {
+			err = fmt.Errorf("error writing config: %v", err)
+		}
+		return
+	}
+	// file exists, deserialise
+	err = json.Unmarshal(data, self)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse config: %v", err)
+	}
+	// check public key
+	if pubkeyhex != self.PublicKey {
+		return nil, fmt.Errorf("public key does not match the one in the config file %v != %v", pubkeyhex, self.PublicKey)
+	}
+	if keyhex != self.BzzKey {
+		return nil, fmt.Errorf("bzz key does not match the one in the config file %v != %v", keyhex, self.BzzKey)
+	}
+	self.Swap.SetKey(prvKey)
+
+	if (self.EnsRoot == common.Address{}) {
+		self.EnsRoot = toyNetEnsRoot
+	}
+
+	return
+}
+
+func (self *Config) Save() error {
+	data, err := json.MarshalIndent(self, "", "    ")
+	if err != nil {
+		return err
+	}
+	err = os.MkdirAll(self.Path, os.ModePerm)
+	if err != nil {
+		return err
+	}
+	confpath := filepath.Join(self.Path, "config.json")
+	return ioutil.WriteFile(confpath, data, os.ModePerm)
+}