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package plcresolver
import (
"context"
"errors"
"fmt"
"net"
"net/http"
"strings"
"github.com/bluesky-social/indigo/atproto/identity"
"github.com/bluesky-social/indigo/atproto/syntax"
"github.com/johnandersen777/socialweb-computer-kcp/internal/revocation"
)
type Options struct {
URL string
Client *http.Client
}
type Resolver struct {
dir *identity.BaseDirectory
}
type nxdomainIsAnOutage struct{ inner http.RoundTripper }
func (t nxdomainIsAnOutage) RoundTrip(r *http.Request) (*http.Response, error) {
resp, err := t.inner.RoundTrip(r)
var dnsErr *net.DNSError
if errors.As(err, &dnsErr) && dnsErr.IsNotFound {
return nil, fmt.Errorf(
"the name does not resolve, which is an outage and not an absence: %s", err)
}
return resp, err
}
func New(opts Options) (*Resolver, error) {
if opts.URL == "" {
return nil, errors.New("plcresolver: URL is required")
}
if opts.Client == nil {
return nil, errors.New("plcresolver: Client is required")
}
client := *opts.Client
transport := client.Transport
if transport == nil {
transport = http.DefaultTransport
}
client.Transport = nxdomainIsAnOutage{inner: transport}
return &Resolver{dir: &identity.BaseDirectory{
PLCURL: strings.TrimSuffix(opts.URL, "/"),
PLCClient: &client,
HTTPClient: client,
}}, nil
}
func (r *Resolver) Resolve(ctx context.Context, did string) (revocation.PLCResolution, error) {
parsed, err := syntax.ParseDID(did)
if err != nil {
return unknown(fmt.Errorf("plcresolver: %q is not a DID: %w", did, err))
}
switch parsed.Method() {
case "plc", "web":
default:
return unknown(fmt.Errorf(
"plcresolver: %s is a did:%s, and this package resolves only a method with a "+
"document somewhere: a did:key's key IS its identity, so there is nothing to "+
"resolve and nothing that could ever be found gone", did, parsed.Method()))
}
doc, err := r.dir.ResolveDID(ctx, parsed)
switch {
case errors.Is(err, identity.ErrDIDNotFound):
return revocation.PLCResolution{Found: false}, nil
case err != nil:
return unknown(fmt.Errorf("plcresolver: resolve %s: %w", did, err))
}
keys := make([]string, 0, len(doc.VerificationMethod))
for _, vm := range doc.VerificationMethod {
keys = append(keys, vm.ID)
}
return revocation.PLCResolution{Found: true, Keys: keys}, nil
}
func unknown(err error) (revocation.PLCResolution, error) {
return revocation.PLCResolution{Err: err}, err
}
