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manager.go
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manager.go
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// Package ipns enables interaction with InterPlanetary Name System.
package ipns
import (
"fmt"
"path"
"sync"
"time"
shell "github.com/ipfs/go-ipfs-api"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/multiformats/go-multibase"
)
type Manager interface {
UpdateIPNSEntry(string) error
GetIPNSAddr() string
}
type TestManagerResolver struct {
resolved string
mu sync.RWMutex
}
func NewTestManager() *TestManagerResolver {
return &TestManagerResolver{}
}
func (m *TestManagerResolver) UpdateIPNSEntry(commitCID string) error {
m.mu.Lock()
defer m.mu.Unlock()
m.resolved = commitCID
return nil
}
func (m *TestManagerResolver) GetIPNSAddr() string {
return ""
}
func (m *TestManagerResolver) ResolveIPNS(_ string) (string, error) {
m.mu.RLock()
defer m.mu.RUnlock()
return fmt.Sprintf("/ipfs/%s", m.resolved), nil
}
type IPNSManager struct {
shell *shell.Shell
ipnsAddr string
}
func getIPNSAddress(sh *shell.Shell) (string, error) {
// this implementation is extremely non-obvious
// because IPFS doesn't normally allow for finding IPNS address
// of given key unless some file is added to it.
resp, err := sh.ID()
if err != nil {
return "", fmt.Errorf("get IPFS ID: %w", err)
}
pid, err := peer.Decode(resp.ID)
if err != nil {
return "", fmt.Errorf("decode peer ID: %w", err)
}
ipnsAddr, err := peer.ToCid(pid).StringOfBase(multibase.Base36)
if err != nil {
return "", fmt.Errorf("encode ipns address: %w", err)
}
return ipnsAddr, nil
}
func NewIPNSManager(sh *shell.Shell) (*IPNSManager, error) {
ipnsAddress, err := getIPNSAddress(sh)
if err != nil {
return nil, fmt.Errorf("get IPNS address from IPFS node: %w", err)
}
return &IPNSManager{
shell: sh,
ipnsAddr: ipnsAddress,
}, nil
}
func (m *IPNSManager) UpdateIPNSEntry(commitCID string) error {
ipfsAddr := path.Join("/ipfs/", commitCID)
resp, err := m.shell.PublishWithDetails(ipfsAddr, "", 24*time.Hour, 10*time.Minute, false)
if err != nil {
return fmt.Errorf("publishing ipns update to ipfs daemon: %v", err)
}
m.ipnsAddr = resp.Name
return nil
}
func (m *IPNSManager) GetIPNSAddr() string {
return m.ipnsAddr
}