Initial implementation of namesys/publisher
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6b9d205ef2
commit
b17403b61a
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#ifndef IPFS_PUBLISHER_H
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#define IPFS_PUBLISHER_H
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char* ipns_entry_data_for_sig (struct ipns_entry *entry);
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int ipns_selector_func (int *idx, struct ipns_entry ***recs, char *k, char **vals);
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int ipns_select_record (int *idx, struct ipns_entry **recs, char **vals);
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// ipns_validate_ipns_record implements ValidatorFunc and verifies that the
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// given 'val' is an IpnsEntry and that that entry is valid.
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int ipns_validate_ipns_record (char *k, char *val);
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#endif // IPFS_PUBLISHER_H
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@ -1,362 +1,125 @@
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var PublishPutValTimeout = time.Minute
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#include <stdlib.h>
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#include <string.h>
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#include "ipfs/errs.h"
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#include "ipfs/util/time.h"
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#include "ipfs/namesys/pb.h"
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#include "ipfs/namesys/publisher.h"
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// ipnsPublisher is capable of publishing and resolving names to the IPFS
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// routing system.
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type ipnsPublisher struct {
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routing routing.ValueStore
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ds ds.Datastore
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char* ipns_entry_data_for_sig (struct ipns_entry *entry)
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{
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char *ret;
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if (!entry || !entry->value || !entry->validity) {
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return NULL;
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}
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ret = calloc (1, strlen(entry->value) + strlen (entry->validity) + sizeof(IpnsEntry_ValidityType) + 1);
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if (ret) {
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strcpy(ret, entry->value);
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strcat(ret, entry->validity);
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if (entry->validityType) {
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memcpy(ret+strlen(entry->value)+strlen(entry->validity), entry->validityType, sizeof(IpnsEntry_ValidityType));
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} else {
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memcpy(ret+strlen(entry->value)+strlen(entry->validity), &IpnsEntry_EOL, sizeof(IpnsEntry_ValidityType));
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}
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}
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return ret;
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}
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// NewRoutingPublisher constructs a publisher for the IPFS Routing name system.
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func NewRoutingPublisher(route routing.ValueStore, ds ds.Datastore) *ipnsPublisher {
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if ds == nil {
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panic("nil datastore")
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}
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return &ipnsPublisher{routing: route, ds: ds}
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int ipns_selector_func (int *idx, struct ipns_entry ***recs, char *k, char **vals)
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{
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int err, i, c;
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if (!idx || !recs || !k || !vals) {
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return ErrInvalidParam;
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}
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for (c = 0 ; vals[c] ; c++); // count array
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*recs = calloc(c+1, sizeof (void*)); // allocate return array.
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if (!*recs) {
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return ErrAllocFailed;
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}
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for (i = 0 ; i < c ; i++) {
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*recs[i] = calloc(1, sizeof (struct ipns_entry)); // alloc every record
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if (!*recs[i]) {
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return ErrAllocFailed;
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}
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//err = proto.Unmarshal(vals[i], *recs[i]); // and decode.
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if (err) {
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ipfs_namesys_ipnsentry_reset (*recs[i]); // make sure record is empty.
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}
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}
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return ipns_select_record(idx, *recs, vals);
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}
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// Publish implements Publisher. Accepts a keypair and a value,
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// and publishes it out to the routing system
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func (p *ipnsPublisher) Publish(ctx context.Context, k ci.PrivKey, value path.Path) error {
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log.Debugf("Publish %s", value)
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return p.PublishWithEOL(ctx, k, value, time.Now().Add(time.Hour*24))
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int ipns_select_record (int *idx, struct ipns_entry **recs, char **vals)
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{
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int err, i, best_i = -1, best_seq = 0;
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struct timespec rt, bestt;
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if (!idx || !recs || !vals) {
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return ErrInvalidParam;
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}
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for (i = 0 ; recs[i] ; i++) {
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if (!(recs[i]->sequence) || *(recs[i]->sequence) < best_seq) {
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continue;
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}
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if (best_i == -1 || *(recs[i]->sequence) > best_seq) {
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best_seq = *(recs[i]->sequence);
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best_i = i;
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} else if (*(recs[i]->sequence) == best_seq) {
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err = ipfs_util_time_parse_RFC3339 (&rt, ipfs_namesys_pb_get_validity (recs[i]));
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if (err) {
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continue;
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}
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err = ipfs_util_time_parse_RFC3339 (&bestt, ipfs_namesys_pb_get_validity (recs[best_i]));
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if (err) {
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continue;
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}
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if (rt.tv_sec > bestt.tv_sec || (rt.tv_sec == bestt.tv_sec && rt.tv_nsec > bestt.tv_nsec)) {
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best_i = i;
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} else if (rt.tv_sec == bestt.tv_sec && rt.tv_nsec == bestt.tv_nsec) {
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if (memcmp(vals[i], vals[best_i], strlen(vals[best_i])) > 0) { // FIXME: strlen?
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best_i = i;
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}
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}
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}
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}
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if (best_i == -1) {
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return ErrNoRecord;
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}
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*idx = best_i;
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return 0;
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}
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// PublishWithEOL is a temporary stand in for the ipns records implementation
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// see here for more details: https://github.com/ipfs/specs/tree/master/records
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func (p *ipnsPublisher) PublishWithEOL(ctx context.Context, k ci.PrivKey, value path.Path, eol time.Time) error {
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id, err := peer.IDFromPrivateKey(k)
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if err != nil {
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return err
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}
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_, ipnskey := IpnsKeysForID(id)
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// get previous records sequence number
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seqnum, err := p.getPreviousSeqNo(ctx, ipnskey)
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if err != nil {
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return err
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}
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// increment it
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seqnum++
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return PutRecordToRouting(ctx, k, value, seqnum, eol, p.routing, id)
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}
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func (p *ipnsPublisher) getPreviousSeqNo(ctx context.Context, ipnskey string) (uint64, error) {
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prevrec, err := p.ds.Get(dshelp.NewKeyFromBinary(ipnskey))
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if err != nil && err != ds.ErrNotFound {
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// None found, lets start at zero!
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return 0, err
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}
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var val []byte
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if err == nil {
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prbytes, ok := prevrec.([]byte)
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if !ok {
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return 0, fmt.Errorf("unexpected type returned from datastore: %#v", prevrec)
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}
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dhtrec := new(dhtpb.Record)
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err := proto.Unmarshal(prbytes, dhtrec)
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if err != nil {
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return 0, err
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}
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val = dhtrec.GetValue()
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} else {
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// try and check the dht for a record
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ctx, cancel := context.WithTimeout(ctx, time.Second*30)
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defer cancel()
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rv, err := p.routing.GetValue(ctx, ipnskey)
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if err != nil {
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// no such record found, start at zero!
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return 0, nil
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}
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val = rv
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}
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e := new(pb.IpnsEntry)
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err = proto.Unmarshal(val, e)
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if err != nil {
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return 0, err
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}
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return e.GetSequence(), nil
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}
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// setting the TTL on published records is an experimental feature.
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// as such, i'm using the context to wire it through to avoid changing too
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// much code along the way.
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func checkCtxTTL(ctx context.Context) (time.Duration, bool) {
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v := ctx.Value("ipns-publish-ttl")
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if v == nil {
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return 0, false
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}
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d, ok := v.(time.Duration)
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return d, ok
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}
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func PutRecordToRouting(ctx context.Context, k ci.PrivKey, value path.Path, seqnum uint64, eol time.Time, r routing.ValueStore, id peer.ID) error {
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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namekey, ipnskey := IpnsKeysForID(id)
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entry, err := CreateRoutingEntryData(k, value, seqnum, eol)
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if err != nil {
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return err
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}
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ttl, ok := checkCtxTTL(ctx)
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if ok {
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entry.Ttl = proto.Uint64(uint64(ttl.Nanoseconds()))
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}
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errs := make(chan error, 2)
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go func() {
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errs <- PublishEntry(ctx, r, ipnskey, entry)
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}()
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go func() {
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errs <- PublishPublicKey(ctx, r, namekey, k.GetPublic())
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}()
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err = waitOnErrChan(ctx, errs)
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if err != nil {
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return err
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}
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err = waitOnErrChan(ctx, errs)
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if err != nil {
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return err
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}
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return nil
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}
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func waitOnErrChan(ctx context.Context, errs chan error) error {
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select {
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case err := <-errs:
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return err
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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func PublishPublicKey(ctx context.Context, r routing.ValueStore, k string, pubk ci.PubKey) error {
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log.Debugf("Storing pubkey at: %s", k)
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pkbytes, err := pubk.Bytes()
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if err != nil {
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return err
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}
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// Store associated public key
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timectx, cancel := context.WithTimeout(ctx, PublishPutValTimeout)
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defer cancel()
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err = r.PutValue(timectx, k, pkbytes)
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if err != nil {
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return err
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}
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return nil
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}
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func PublishEntry(ctx context.Context, r routing.ValueStore, ipnskey string, rec *pb.IpnsEntry) error {
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timectx, cancel := context.WithTimeout(ctx, PublishPutValTimeout)
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defer cancel()
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data, err := proto.Marshal(rec)
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if err != nil {
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return err
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}
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log.Debugf("Storing ipns entry at: %s", ipnskey)
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// Store ipns entry at "/ipns/"+b58(h(pubkey))
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if err := r.PutValue(timectx, ipnskey, data); err != nil {
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return err
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}
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return nil
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}
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func CreateRoutingEntryData(pk ci.PrivKey, val path.Path, seq uint64, eol time.Time) (*pb.IpnsEntry, error) {
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entry := new(pb.IpnsEntry)
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entry.Value = []byte(val)
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typ := pb.IpnsEntry_EOL
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entry.ValidityType = &typ
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entry.Sequence = proto.Uint64(seq)
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entry.Validity = []byte(u.FormatRFC3339(eol))
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sig, err := pk.Sign(ipnsEntryDataForSig(entry))
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if err != nil {
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return nil, err
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}
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entry.Signature = sig
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return entry, nil
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}
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func ipnsEntryDataForSig(e *pb.IpnsEntry) []byte {
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return bytes.Join([][]byte{
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e.Value,
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e.Validity,
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[]byte(fmt.Sprint(e.GetValidityType())),
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},
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[]byte{})
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}
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var IpnsRecordValidator = &record.ValidChecker{
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Func: ValidateIpnsRecord,
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Sign: true,
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}
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func IpnsSelectorFunc(k string, vals [][]byte) (int, error) {
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var recs []*pb.IpnsEntry
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for _, v := range vals {
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e := new(pb.IpnsEntry)
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err := proto.Unmarshal(v, e)
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if err == nil {
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recs = append(recs, e)
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} else {
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recs = append(recs, nil)
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}
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}
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return selectRecord(recs, vals)
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}
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func selectRecord(recs []*pb.IpnsEntry, vals [][]byte) (int, error) {
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var best_seq uint64
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best_i := -1
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for i, r := range recs {
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if r == nil || r.GetSequence() < best_seq {
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continue
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}
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if best_i == -1 || r.GetSequence() > best_seq {
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best_seq = r.GetSequence()
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best_i = i
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} else if r.GetSequence() == best_seq {
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rt, err := u.ParseRFC3339(string(r.GetValidity()))
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if err != nil {
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continue
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}
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bestt, err := u.ParseRFC3339(string(recs[best_i].GetValidity()))
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if err != nil {
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continue
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}
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if rt.After(bestt) {
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best_i = i
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} else if rt == bestt {
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if bytes.Compare(vals[i], vals[best_i]) > 0 {
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best_i = i
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}
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}
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}
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}
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if best_i == -1 {
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return 0, errors.New("no usable records in given set")
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}
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return best_i, nil
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}
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// ValidateIpnsRecord implements ValidatorFunc and verifies that the
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// ipns_validate_ipns_record implements ValidatorFunc and verifies that the
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// given 'val' is an IpnsEntry and that that entry is valid.
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int ValidateIpnsRecord (char *k, char *val)
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int ipns_validate_ipns_record (char *k, char *val)
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{
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int err;
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struct ipns_entry *entry = ipfs_namesys_pb_new_ipns_entry();
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struct timespec ts, now;
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}
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func ValidateIpnsRecord(k string, val []byte) error {
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entry := new(pb.IpnsEntry)
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err := proto.Unmarshal(val, entry)
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if err != nil {
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return err
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}
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switch entry.GetValidityType() {
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case pb.IpnsEntry_EOL:
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t, err := u.ParseRFC3339(string(entry.GetValidity()))
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if err != nil {
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log.Debug("failed parsing time for ipns record EOL")
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return err
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}
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if time.Now().After(t) {
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return ErrExpiredRecord
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}
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default:
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return ErrUnrecognizedValidity
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}
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return nil
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}
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// InitializeKeyspace sets the ipns record for the given key to
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// point to an empty directory.
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// TODO: this doesnt feel like it belongs here
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int InitializeKeyspace (DAGService ds, Publisher pub, Pinner pins, ciPrivKey key)
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{
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int err;
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Node emptyDir;
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Cid nodek;
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err = ipfs_merkledag_add(ds, nodek, emptyDir);
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if (err) {
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return err;
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}
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// pin recursively because this might already be pinned
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// and doing a direct pin would throw an error in that case
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err = ipfs_pins_pin(emptyDir, TRUE);
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if (err) {
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return err;
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}
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err = ipfs_pins_flush();
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if (err) {
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return err;
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}
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err = ipfs_pub_publish(key, PathFromCid(nodek));
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if (err) {
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return err;
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}
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return 0;
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}
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int IpnsKeysForID (char **namekey, char **ipnskey, char *id)
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{
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char namekey_prefix[] = "/pk/";
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char ipnskey_prefix[] = "/ipns/";
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int i, n;
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n = sizeof(namekey_prefix) + strlen(id);
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*namekey = malloc(n);
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if (!*namekey) {
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if (!entry) {
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return ErrAllocFailed;
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}
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*ipnskey = malloc(i);
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if (!*ipnskey) {
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free (*namekey);
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*namekey = NULL;
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return ErrAllocFailed;
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//err = proto.Unmarshal(val, entry);
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if (err) {
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return err;
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}
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if (ipfs_namesys_pb_get_validity_type (entry) == IpnsEntry_EOL) {
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err = ipfs_util_time_parse_RFC3339 (&ts, ipfs_namesys_pb_get_validity (entry));
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if (err) {
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//log.Debug("failed parsing time for ipns record EOL")
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return err;
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}
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timespec_get (&now, TIME_UTC);
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if (now.tv_nsec > ts.tv_nsec || (now.tv_nsec == ts.tv_nsec && now.tv_nsec > ts.tv_nsec)) {
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return ErrExpiredRecord;
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}
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} else {
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return ErrUnrecognizedValidity;
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}
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namekey[--n] = '\0';
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strncpy (*namekey, namekey_prefix, n);
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strncat (*namekey, id, n - strlen (namekey));
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ipnskey[--i] = '\0';
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strncpy (*ipnskey, ipnskey_prefix, i);
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strncat (*ipnskey, id, i - strlen (ipnskey));
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return 0;
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}
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