bool hash_store_build_reply(struct hash_store* self, struct ndn_charbuf* reply, const uint8_t* hash, const uint8_t* payload, size_t payloadsz) {
ndnb_element_begin(reply, NDN_DTAG_ContentObject);
ndnb_element_begin(reply, NDN_DTAG_Signature);
ndnb_tagged_putf(reply, NDN_DTAG_DigestAlgorithm, "SHA256");
ndnb_append_tagged_blob(reply, NDN_DTAG_SignatureBits, hash, SEGMENT_HASHSZ);
ndnb_element_end(reply);//Signature
ndnb_element_begin(reply, NDN_DTAG_Name);
ndnb_append_tagged_blob(reply, NDN_DTAG_Component, REPO_SHA256, sizeof(REPO_SHA256)-1);
ndnb_append_tagged_blob(reply, NDN_DTAG_Component, hash, SEGMENT_HASHSZ);
ndnb_element_end(reply);//Name
ndnb_element_begin(reply, NDN_DTAG_SignedInfo);
ndnb_append_tagged_blob(reply, NDN_DTAG_PublisherPublicKeyDigest, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 32);
ndnb_element_begin(reply, NDN_DTAG_Timestamp);
ndnb_append_now_blob(reply, NDN_MARKER_NONE);
ndnb_element_end(reply);//Timestamp
ndnb_element_end(reply);//SignedInfo
ndnb_append_tagged_blob(reply, NDN_DTAG_Content, payload, payloadsz);
ndnb_element_end(reply);//ContentObject
return true;
}
/**
* Extend a Name with a new version stamp
* @param h is the the ndn handle.
* May be NULL. This procedure does not use the connection.
* @param name is a ndnb-encoded Name prefix. By default it gets extended
* in-place with one additional Component that conforms to the
* versioning profile and is based on the supplied time, unless a
* version component is already present.
* @param versioning_flags modifies the default behavior:
* NDN_V_REPLACE causes the last component to be replaced if it
* appears to be a version stamp. If NDN_V_HIGH is set as well, an
* attempt will be made to generate a new version stamp that is
* later than the existing one, or to return an error.
* NDN_V_NOW bases the version on the current time rather than the
* supplied time.
* NDN_V_NESTOK will allow the new version component to be appended
* even if there is one there (this makes no difference if NDN_V_REPLACE
* is also set).
* @param secs is the desired time, in seconds since epoch
* (ignored if NDN_V_NOW is set).
* @param nsecs is the number of nanoseconds.
* @returns -1 for error, 0 for success.
*/
int
ndn_create_version(struct ndn *h, struct ndn_charbuf *name,
int versioning_flags, intmax_t secs, int nsecs)
{
size_t i;
size_t j;
size_t lc = 0;
size_t oc = 0;
int n;
struct ndn_indexbuf *nix = NULL;
int myres = -1;
int already_versioned = 0;
int ok_flags = (NDN_V_REPLACE | NDN_V_HIGH | NDN_V_NOW | NDN_V_NESTOK);
// XXX - right now we ignore h, but in the future we may use it to try to avoid non-monotonicies in the versions.
nix = ndn_indexbuf_create();
n = ndn_name_split(name, nix);
if (n < 0)
goto Finish;
if ((versioning_flags & ~ok_flags) != 0)
goto Finish;
/* Check for existing version component */
if (n >= 1) {
oc = nix->buf[n-1];
lc = nix->buf[n] - oc;
if (lc <= 11 && lc >= 6 && name->buf[oc + 2] == NDN_MARKER_VERSION)
already_versioned = 1;
}
myres = 0;
if (already_versioned &&
(versioning_flags & (NDN_V_REPLACE | NDN_V_NESTOK)) == 0)
goto Finish;
name->length -= 1; /* Strip name closer */
i = name->length;
myres |= ndn_charbuf_append_tt(name, NDN_DTAG_Component, NDN_DTAG);
if ((versioning_flags & NDN_V_NOW) != 0)
myres |= ndnb_append_now_blob(name, NDN_MARKER_VERSION);
else {
myres |= ndnb_append_timestamp_blob(name, NDN_MARKER_VERSION, secs, nsecs);
}
myres |= ndn_charbuf_append_closer(name); /* </Component> */
if (myres < 0) {
name->length = i;
goto CloseName;
}
j = name->length;
if (already_versioned && (versioning_flags & NDN_V_REPLACE) != 0) {
oc = nix->buf[n-1];
lc = nix->buf[n] - oc;
if ((versioning_flags & NDN_V_HIGH) != 0 &&
memcmp(name->buf + oc, name->buf + i, j - i) > 0) {
/* Supplied version is in the future. */
name->length = i;
// XXX - we could try harder to make this work, for now just error out
myres = -1;
goto CloseName;
}
memmove(name->buf + oc, name->buf + i, j - i);
name->length -= lc;
}
CloseName:
myres |= ndn_charbuf_append_closer(name); /* </Name> */
Finish:
myres = (myres < 0) ? -1 : 0;
ndn_indexbuf_destroy(&nix);
return(myres);
}