mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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132 lines
3.5 KiB
Go
132 lines
3.5 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package api
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import (
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"fmt"
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"net/url"
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"regexp"
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"strings"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/swarm/storage"
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)
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//matches hex swarm hashes
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// TODO: this is bad, it should not be hardcoded how long is a hash
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var hashMatcher = regexp.MustCompile("^([0-9A-Fa-f]{64})([0-9A-Fa-f]{64})?$")
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// URI is a reference to content stored in swarm.
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type URI struct {
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// Scheme has one of the following values:
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//
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// * bzz - an entry in a swarm manifest
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// * bzz-raw - raw swarm content
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// * bzz-immutable - immutable URI of an entry in a swarm manifest
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// (address is not resolved)
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// * bzz-list - list of all files contained in a swarm manifest
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//
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Scheme string
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// Addr is either a hexadecimal storage address or it an address which
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// resolves to a storage address
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Addr string
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// addr stores the parsed storage address
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addr storage.Address
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// Path is the path to the content within a swarm manifest
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Path string
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}
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// Parse parses rawuri into a URI struct, where rawuri is expected to have one
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// of the following formats:
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//
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// * <scheme>:/
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// * <scheme>:/<addr>
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// * <scheme>:/<addr>/<path>
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// * <scheme>://
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// * <scheme>://<addr>
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// * <scheme>://<addr>/<path>
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//
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// with scheme one of bzz, bzz-raw, bzz-immutable, bzz-list or bzz-hash
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func Parse(rawuri string) (*URI, error) {
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u, err := url.Parse(rawuri)
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if err != nil {
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return nil, err
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}
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uri := &URI{Scheme: u.Scheme}
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// check the scheme is valid
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switch uri.Scheme {
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case "bzz", "bzz-raw", "bzz-immutable", "bzz-list", "bzz-hash", "bzz-resource":
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default:
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return nil, fmt.Errorf("unknown scheme %q", u.Scheme)
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}
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// handle URIs like bzz://<addr>/<path> where the addr and path
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// have already been split by url.Parse
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if u.Host != "" {
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uri.Addr = u.Host
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uri.Path = strings.TrimLeft(u.Path, "/")
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return uri, nil
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}
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// URI is like bzz:/<addr>/<path> so split the addr and path from
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// the raw path (which will be /<addr>/<path>)
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parts := strings.SplitN(strings.TrimLeft(u.Path, "/"), "/", 2)
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uri.Addr = parts[0]
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if len(parts) == 2 {
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uri.Path = parts[1]
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}
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return uri, nil
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}
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func (u *URI) Resource() bool {
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return u.Scheme == "bzz-resource"
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}
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func (u *URI) Raw() bool {
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return u.Scheme == "bzz-raw"
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}
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func (u *URI) Immutable() bool {
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return u.Scheme == "bzz-immutable"
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}
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func (u *URI) List() bool {
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return u.Scheme == "bzz-list"
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}
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func (u *URI) Hash() bool {
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return u.Scheme == "bzz-hash"
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}
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func (u *URI) String() string {
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return u.Scheme + ":/" + u.Addr + "/" + u.Path
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}
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func (u *URI) Address() storage.Address {
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if u.addr != nil {
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return u.addr
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}
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if hashMatcher.MatchString(u.Addr) {
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u.addr = common.Hex2Bytes(u.Addr)
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return u.addr
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}
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return nil
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}
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