2 This file is part of GNUnet.
3 Copyright (C) 2003--2014 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 * @brief Parses and produces uri strings.
22 * @author Igor Wronsky, Christian Grothoff
24 * GNUnet URIs are of the general form "gnunet://MODULE/IDENTIFIER".
25 * The specific structure of "IDENTIFIER" depends on the module and
26 * maybe differenciated into additional subcategories if applicable.
27 * This module only deals with fs identifiers (MODULE = "fs").
30 * This module only parses URIs for the AFS module. The FS URIs fall
31 * into four categories, "chk", "sks", "ksk" and "loc". The first three
32 * categories were named in analogy (!) to Freenet, but they do NOT
33 * work in exactly the same way. They are very similar from the user's
34 * point of view (unique file identifier, subspace, keyword), but the
35 * implementation is rather different in pretty much every detail.
36 * The concrete URI formats are:
40 * First, there are URIs that identify a file. They have the format
41 * "gnunet://fs/chk/HEX1.HEX2.SIZE". These URIs can be used to
42 * download the file. The description, filename, mime-type and other
43 * meta-data is NOT part of the file-URI since a URI uniquely
44 * identifies a resource (and the contents of the file would be the
45 * same even if it had a different description).
49 * The second category identifies entries in a namespace. The format
50 * is "gnunet://fs/sks/NAMESPACE/IDENTIFIER" where the namespace
51 * should be given in HEX. Applications may allow using a nickname
52 * for the namespace if the nickname is not ambiguous. The identifier
53 * can be either an ASCII sequence or a HEX-encoding. If the
54 * identifier is in ASCII but the format is ambiguous and could denote
55 * a HEX-string a "/" is appended to indicate ASCII encoding.
59 * The third category identifies ordinary searches. The format is
60 * "gnunet://fs/ksk/KEYWORD[+KEYWORD]*". Using the "+" syntax
61 * it is possible to encode searches with the boolean "AND" operator.
62 * "+" is used since it indicates a commutative 'and' operation and
63 * is unlikely to be used in a keyword by itself.
67 * The last category identifies a datum on a specific machine. The
68 * format is "gnunet://fs/loc/HEX1.HEX2.SIZE.PEER.SIG.EXPTIME". PEER is
69 * the BinName of the public key of the peer storing the datum. The
70 * signature (SIG) certifies that this peer has this content.
71 * HEX1, HEX2 and SIZE correspond to a 'chk' URI.
75 * The encoding for hexadecimal values is defined in the hashing.c
76 * module in the gnunetutil library and discussed there.
80 #include "gnunet_fs_service.h"
81 #include "gnunet_signatures.h"
92 * Get a unique key from a URI. This is for putting URIs
93 * into HashMaps. The key may change between FS implementations.
95 * @param uri uri to convert to a unique key
96 * @param key where to store the unique key
97 * @return #GNUNET_OK on success
100 GNUNET_FS_uri_to_key (const struct GNUNET_FS_Uri *uri,
101 struct GNUNET_HashCode *key)
105 case GNUNET_FS_URI_CHK:
106 *key = uri->data.chk.chk.query;
108 case GNUNET_FS_URI_SKS:
109 GNUNET_CRYPTO_hash (uri->data.sks.identifier,
110 strlen (uri->data.sks.identifier),
113 case GNUNET_FS_URI_KSK:
114 if (uri->data.ksk.keywordCount > 0)
116 GNUNET_CRYPTO_hash (uri->data.ksk.keywords[0],
117 strlen (uri->data.ksk.keywords[0]),
123 memset (key, 0, sizeof (struct GNUNET_HashCode));
124 return GNUNET_SYSERR;
127 case GNUNET_FS_URI_LOC:
128 GNUNET_CRYPTO_hash (&uri->data.loc.fi,
129 sizeof (struct FileIdentifier) +
130 sizeof (struct GNUNET_PeerIdentity),
134 memset (key, 0, sizeof (struct GNUNET_HashCode));
135 return GNUNET_SYSERR;
141 * Convert keyword URI to a human readable format
142 * (i.e. the search query that was used in the first place)
144 * @param uri ksk uri to convert to a string
145 * @return string with the keywords
148 GNUNET_FS_uri_ksk_to_string_fancy (const struct GNUNET_FS_Uri *uri)
155 unsigned int keywordCount;
157 if ((NULL == uri) || (GNUNET_FS_URI_KSK != uri->type))
162 keywords = uri->data.ksk.keywords;
163 keywordCount = uri->data.ksk.keywordCount;
164 n = keywordCount + 1;
165 for (i = 0; i < keywordCount; i++)
167 keyword = keywords[i];
168 n += strlen (keyword) - 1;
169 if (NULL != strstr (&keyword[1], " "))
171 if (keyword[0] == '+')
174 ret = GNUNET_malloc (n);
176 for (i = 0; i < keywordCount; i++)
178 keyword = keywords[i];
179 if (NULL != strstr (&keyword[1], " "))
182 if (keyword[0] == '+')
183 strcat (ret, keyword);
185 strcat (ret, &keyword[1]);
190 if (keyword[0] == '+')
191 strcat (ret, keyword);
193 strcat (ret, &keyword[1]);
202 * Given a keyword with %-encoding (and possibly quotes to protect
203 * spaces), return a copy of the keyword without %-encoding and
204 * without double-quotes (%22). Also, add a space at the beginning
205 * if there is not a '+'.
207 * @param in string with %-encoding
208 * @param emsg where to store the parser error message (if any)
209 * @return decodded string with leading space (or preserved plus)
212 percent_decode_keyword (const char *in,
221 out = GNUNET_strdup (in);
224 while (out[rpos] != '\0')
226 if (out[rpos] == '%')
228 if (1 != SSCANF (&out[rpos + 1], "%2X", &hx))
231 *emsg = GNUNET_strdup (_(/* xgettext:no-c-format */
232 "Malformed KSK URI (`%' must be followed by HEX number)"));
237 continue; /* skip double quote */
238 out[wpos++] = (char) hx;
242 out[wpos++] = out[rpos++];
248 ret = GNUNET_strdup (out);
252 /* need to prefix with space */
253 ret = GNUNET_malloc (strlen (out) + 2);
261 #define GNUNET_FS_URI_KSK_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_KSK_INFIX
266 * @param s an uri string
267 * @param emsg where to store the parser error message (if any)
268 * @return NULL on error, otherwise the KSK URI
270 static struct GNUNET_FS_Uri *
271 uri_ksk_parse (const char *s,
274 struct GNUNET_FS_Uri *ret;
285 pos = strlen (GNUNET_FS_URI_KSK_PREFIX);
286 if ((slen <= pos) || (0 != strncmp (s, GNUNET_FS_URI_KSK_PREFIX, pos)))
287 return NULL; /* not KSK URI */
288 if ((s[slen - 1] == '+') || (s[pos] == '+'))
291 GNUNET_strdup (_("Malformed KSK URI (must not begin or end with `+')"));
296 for (i = pos; i < slen; i++)
298 if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
300 saw_quote = (saw_quote + 1) % 2;
304 if ((s[i] == '+') && (saw_quote == 0))
309 *emsg = GNUNET_strdup (_("Malformed KSK URI (`++' not allowed)"));
316 *emsg = GNUNET_strdup (_("Malformed KSK URI (quotes not balanced)"));
320 dup = GNUNET_strdup (s);
321 keywords = GNUNET_new_array (max,
323 for (i = slen - 1; i >= (int) pos; i--)
325 if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
327 saw_quote = (saw_quote + 1) % 2;
330 if ((dup[i] == '+') && (saw_quote == 0))
332 keywords[--max] = percent_decode_keyword (&dup[i + 1], emsg);
333 if (NULL == keywords[max])
338 keywords[--max] = percent_decode_keyword (&dup[pos], emsg);
339 if (NULL == keywords[max])
341 GNUNET_assert (0 == max);
343 ret = GNUNET_new (struct GNUNET_FS_Uri);
344 ret->type = GNUNET_FS_URI_KSK;
345 ret->data.ksk.keywordCount = iret;
346 ret->data.ksk.keywords = keywords;
349 for (i = 0; i < max; i++)
350 GNUNET_free_non_null (keywords[i]);
351 GNUNET_free (keywords);
357 #define GNUNET_FS_URI_SKS_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_SKS_INFIX
362 * @param s an uri string
363 * @param emsg where to store the parser error message (if any)
364 * @return NULL on error, SKS URI otherwise
366 static struct GNUNET_FS_Uri *
367 uri_sks_parse (const char *s,
370 struct GNUNET_FS_Uri *ret;
371 struct GNUNET_CRYPTO_EcdsaPublicKey ns;
375 pos = strlen (GNUNET_FS_URI_SKS_PREFIX);
376 if ((strlen (s) <= pos) || (0 != strncmp (s, GNUNET_FS_URI_SKS_PREFIX, pos)))
377 return NULL; /* not an SKS URI */
378 end = strchr (&s[pos], '/');
379 if ( (NULL == end) ||
381 GNUNET_STRINGS_string_to_data (&s[pos],
386 *emsg = GNUNET_strdup (_("Malformed SKS URI (wrong syntax)"));
387 return NULL; /* malformed */
389 end++; /* skip over '/' */
390 ret = GNUNET_new (struct GNUNET_FS_Uri);
391 ret->type = GNUNET_FS_URI_SKS;
392 ret->data.sks.ns = ns;
393 ret->data.sks.identifier = GNUNET_strdup (end);
397 #define GNUNET_FS_URI_CHK_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX
403 * @param s an uri string
404 * @param emsg where to store the parser error message (if any)
405 * @return NULL on error, CHK URI otherwise
407 static struct GNUNET_FS_Uri *
408 uri_chk_parse (const char *s,
411 struct GNUNET_FS_Uri *ret;
412 struct FileIdentifier fi;
414 unsigned long long flen;
416 char h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
417 char h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
420 pos = strlen (GNUNET_FS_URI_CHK_PREFIX);
421 if ((slen < pos + 2 * sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
422 (0 != strncmp (s, GNUNET_FS_URI_CHK_PREFIX, pos)))
423 return NULL; /* not a CHK URI */
424 if ((s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
425 (s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
427 *emsg = GNUNET_strdup (_("Malformed CHK URI (wrong syntax)"));
430 GNUNET_memcpy (h1, &s[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
431 h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
432 GNUNET_memcpy (h2, &s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)],
433 sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
434 h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
436 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &fi.chk.key)) ||
437 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &fi.chk.query)) ||
439 SSCANF (&s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
442 *emsg = GNUNET_strdup (_("Malformed CHK URI (failed to decode CHK)"));
445 fi.file_length = GNUNET_htonll (flen);
446 ret = GNUNET_new (struct GNUNET_FS_Uri);
447 ret->type = GNUNET_FS_URI_CHK;
453 GNUNET_NETWORK_STRUCT_BEGIN
455 * Structure that defines how the contents of a location URI must be
456 * assembled in memory to create or verify the signature of a location
459 struct LocUriAssembly
462 * What is being signed (rest of this struct).
464 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
467 * Expiration time of the offer.
469 struct GNUNET_TIME_AbsoluteNBO exptime;
472 * File being offered.
474 struct FileIdentifier fi;
477 * Peer offering the file.
479 struct GNUNET_PeerIdentity peer;
482 GNUNET_NETWORK_STRUCT_END
485 #define GNUNET_FS_URI_LOC_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_LOC_INFIX
487 #define SIGNATURE_ASCII_LENGTH 103
491 * Also verifies validity of the location URI.
493 * @param s an uri string
494 * @param emsg where to store the parser error message (if any)
495 * @return NULL on error, valid LOC URI otherwise
497 static struct GNUNET_FS_Uri *
498 uri_loc_parse (const char *s,
501 struct GNUNET_FS_Uri *uri;
502 char h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
503 char h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
506 unsigned long long exptime;
507 unsigned long long flen;
508 struct GNUNET_TIME_Absolute et;
509 struct GNUNET_CRYPTO_EddsaSignature sig;
510 struct LocUriAssembly ass;
514 pos = strlen (GNUNET_FS_URI_LOC_PREFIX);
515 if ((slen < pos + 2 * sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
516 (0 != strncmp (s, GNUNET_FS_URI_LOC_PREFIX, pos)))
517 return NULL; /* not a LOC URI */
518 if ((s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
519 (s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
521 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax)"));
524 GNUNET_memcpy (h1, &s[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
525 h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
526 GNUNET_memcpy (h2, &s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)],
527 sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
528 h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
530 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &ass.fi.chk.key)) ||
531 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &ass.fi.chk.query)) ||
533 SSCANF (&s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
536 *emsg = GNUNET_strdup (_("LOC URI malformed (no CHK)"));
539 ass.fi.file_length = GNUNET_htonll (flen);
541 npos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2;
542 while ((s[npos] != '\0') && (s[npos] != '.'))
546 *emsg = GNUNET_strdup (_("LOC URI malformed (missing LOC)"));
550 if ( (strlen (&s[npos]) <= GNUNET_CRYPTO_PKEY_ASCII_LENGTH + 1) ||
551 ('.' != s[npos+GNUNET_CRYPTO_PKEY_ASCII_LENGTH]) )
554 GNUNET_strdup (_("LOC URI malformed (wrong syntax for public key)"));
557 GNUNET_CRYPTO_eddsa_public_key_from_string (&s[npos],
558 GNUNET_CRYPTO_PKEY_ASCII_LENGTH,
559 &ass.peer.public_key))
562 GNUNET_strdup (_("LOC URI malformed (could not decode public key)"));
565 npos += GNUNET_CRYPTO_PKEY_ASCII_LENGTH;
566 if (s[npos++] != '.')
568 *emsg = GNUNET_strdup (_("LOC URI malformed (could not find signature)"));
571 if ( (strlen (&s[npos]) <= SIGNATURE_ASCII_LENGTH + 1) ||
572 ('.' != s[npos + SIGNATURE_ASCII_LENGTH]) )
574 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax for signature)"));
578 GNUNET_STRINGS_string_to_data (&s[npos],
579 SIGNATURE_ASCII_LENGTH,
581 sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
583 *emsg = GNUNET_strdup (_("LOC URI malformed (could not decode signature)"));
586 npos += SIGNATURE_ASCII_LENGTH;
587 if (s[npos++] != '.')
589 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax for expiration time)"));
592 if (1 != SSCANF (&s[npos], "%llu", &exptime))
595 GNUNET_strdup (_("LOC URI malformed (could not parse expiration time)"));
598 ass.purpose.size = htonl (sizeof (struct LocUriAssembly));
599 ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
600 et.abs_value_us = exptime * 1000LL * 1000LL;
601 ass.exptime = GNUNET_TIME_absolute_hton (et);
603 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT,
604 &ass.purpose, &sig, &ass.peer.public_key))
607 GNUNET_strdup (_("LOC URI malformed (signature failed validation)"));
610 uri = GNUNET_new (struct GNUNET_FS_Uri);
611 uri->type = GNUNET_FS_URI_LOC;
612 uri->data.loc.fi = ass.fi;
613 uri->data.loc.peer = ass.peer;
614 uri->data.loc.expirationTime = et;
615 uri->data.loc.contentSignature = sig;
624 * Convert a UTF-8 String to a URI.
626 * @param uri string to parse
627 * @param emsg where to store the parser error message (if any)
628 * @return NULL on error
630 struct GNUNET_FS_Uri *
631 GNUNET_FS_uri_parse (const char *uri,
634 struct GNUNET_FS_Uri *ret;
641 *emsg = GNUNET_strdup (_("invalid argument"));
647 if ((NULL != (ret = uri_chk_parse (uri, emsg))) ||
648 (NULL != (ret = uri_ksk_parse (uri, emsg))) ||
649 (NULL != (ret = uri_sks_parse (uri, emsg))) ||
650 (NULL != (ret = uri_loc_parse (uri, emsg))))
653 *emsg = GNUNET_strdup (_("Unrecognized URI type"));
663 * @param uri uri to free
666 GNUNET_FS_uri_destroy (struct GNUNET_FS_Uri *uri)
672 case GNUNET_FS_URI_KSK:
673 for (i = 0; i < uri->data.ksk.keywordCount; i++)
674 GNUNET_free (uri->data.ksk.keywords[i]);
675 GNUNET_array_grow (uri->data.ksk.keywords, uri->data.ksk.keywordCount, 0);
677 case GNUNET_FS_URI_SKS:
678 GNUNET_free (uri->data.sks.identifier);
680 case GNUNET_FS_URI_LOC:
691 * How many keywords are ANDed in this keyword URI?
693 * @param uri ksk uri to get the number of keywords from
694 * @return 0 if this is not a keyword URI
697 GNUNET_FS_uri_ksk_get_keyword_count (const struct GNUNET_FS_Uri *uri)
699 if (uri->type != GNUNET_FS_URI_KSK)
701 return uri->data.ksk.keywordCount;
706 * Iterate over all keywords in this keyword URI.
708 * @param uri ksk uri to get the keywords from
709 * @param iterator function to call on each keyword
710 * @param iterator_cls closure for iterator
711 * @return -1 if this is not a keyword URI, otherwise number of
712 * keywords iterated over until iterator aborted
715 GNUNET_FS_uri_ksk_get_keywords (const struct GNUNET_FS_Uri *uri,
716 GNUNET_FS_KeywordIterator iterator,
722 if (uri->type != GNUNET_FS_URI_KSK)
724 if (NULL == iterator)
725 return uri->data.ksk.keywordCount;
726 for (i = 0; i < uri->data.ksk.keywordCount; i++)
728 keyword = uri->data.ksk.keywords[i];
729 /* first character of keyword indicates
730 * if it is mandatory or not */
731 if (GNUNET_OK != iterator (iterator_cls, &keyword[1], keyword[0] == '+'))
739 * Add the given keyword to the set of keywords represented by the URI.
740 * Does nothing if the keyword is already present.
742 * @param uri ksk uri to modify
743 * @param keyword keyword to add
744 * @param is_mandatory is this keyword mandatory?
747 GNUNET_FS_uri_ksk_add_keyword (struct GNUNET_FS_Uri *uri,
755 GNUNET_assert (uri->type == GNUNET_FS_URI_KSK);
756 for (i = 0; i < uri->data.ksk.keywordCount; i++)
758 old = uri->data.ksk.keywords[i];
759 if (0 == strcmp (&old[1], keyword))
762 GNUNET_asprintf (&n, is_mandatory ? "+%s" : " %s", keyword);
763 GNUNET_array_append (uri->data.ksk.keywords, uri->data.ksk.keywordCount, n);
768 * Remove the given keyword from the set of keywords represented by the URI.
769 * Does nothing if the keyword is not present.
771 * @param uri ksk uri to modify
772 * @param keyword keyword to add
775 GNUNET_FS_uri_ksk_remove_keyword (struct GNUNET_FS_Uri *uri,
781 GNUNET_assert (uri->type == GNUNET_FS_URI_KSK);
782 for (i = 0; i < uri->data.ksk.keywordCount; i++)
784 old = uri->data.ksk.keywords[i];
785 if (0 == strcmp (&old[1], keyword))
787 uri->data.ksk.keywords[i] =
788 uri->data.ksk.keywords[uri->data.ksk.keywordCount - 1];
789 GNUNET_array_grow (uri->data.ksk.keywords, uri->data.ksk.keywordCount,
790 uri->data.ksk.keywordCount - 1);
799 * Obtain the identity of the peer offering the data
801 * @param uri the location URI to inspect
802 * @param peer where to store the identify of the peer (presumably) offering the content
803 * @return #GNUNET_SYSERR if this is not a location URI, otherwise #GNUNET_OK
806 GNUNET_FS_uri_loc_get_peer_identity (const struct GNUNET_FS_Uri *uri,
807 struct GNUNET_PeerIdentity *peer)
809 if (uri->type != GNUNET_FS_URI_LOC)
810 return GNUNET_SYSERR;
811 *peer = uri->data.loc.peer;
817 * Obtain the expiration of the LOC URI.
819 * @param uri location URI to get the expiration from
820 * @return expiration time of the URI
822 struct GNUNET_TIME_Absolute
823 GNUNET_FS_uri_loc_get_expiration (const struct GNUNET_FS_Uri *uri)
825 GNUNET_assert (uri->type == GNUNET_FS_URI_LOC);
826 return uri->data.loc.expirationTime;
831 * Obtain the URI of the content itself.
833 * @param uri location URI to get the content URI from
834 * @return NULL if argument is not a location URI
836 struct GNUNET_FS_Uri *
837 GNUNET_FS_uri_loc_get_uri (const struct GNUNET_FS_Uri *uri)
839 struct GNUNET_FS_Uri *ret;
841 if (uri->type != GNUNET_FS_URI_LOC)
843 ret = GNUNET_new (struct GNUNET_FS_Uri);
844 ret->type = GNUNET_FS_URI_CHK;
845 ret->data.chk = uri->data.loc.fi;
851 * Construct a location URI (this peer will be used for the location).
852 * This function should only be called from within gnunet-service-fs,
853 * as it requires the peer's private key which is generally unavailable
854 * to processes directly under the user's control. However, for
855 * testing and as it logically fits under URIs, it is in this API.
857 * @param base_uri content offered by the sender
858 * @param sign_key private key of the peer
859 * @param expiration_time how long will the content be offered?
860 * @return the location URI, NULL on error
862 struct GNUNET_FS_Uri *
863 GNUNET_FS_uri_loc_create (const struct GNUNET_FS_Uri *base_uri,
864 const struct GNUNET_CRYPTO_EddsaPrivateKey *sign_key,
865 struct GNUNET_TIME_Absolute expiration_time)
867 struct GNUNET_FS_Uri *uri;
868 struct GNUNET_CRYPTO_EddsaPublicKey my_public_key;
869 struct LocUriAssembly ass;
870 struct GNUNET_TIME_Absolute et;
872 if (GNUNET_FS_URI_CHK != base_uri->type)
874 /* we round expiration time to full seconds for SKS URIs */
875 et.abs_value_us = (expiration_time.abs_value_us / 1000000LL) * 1000000LL;
876 GNUNET_CRYPTO_eddsa_key_get_public (sign_key,
878 ass.purpose.size = htonl (sizeof (struct LocUriAssembly));
879 ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
880 ass.exptime = GNUNET_TIME_absolute_hton (et);
881 ass.fi = base_uri->data.chk;
882 ass.peer.public_key = my_public_key;
883 uri = GNUNET_new (struct GNUNET_FS_Uri);
884 uri->type = GNUNET_FS_URI_LOC;
885 uri->data.loc.fi = base_uri->data.chk;
886 uri->data.loc.expirationTime = et;
887 uri->data.loc.peer.public_key = my_public_key;
888 GNUNET_assert (GNUNET_OK ==
889 GNUNET_CRYPTO_eddsa_sign (sign_key,
891 &uri->data.loc.contentSignature));
897 * Create an SKS URI from a namespace ID and an identifier.
899 * @param ns namespace ID
900 * @param id identifier
901 * @return an FS URI for the given namespace and identifier
903 struct GNUNET_FS_Uri *
904 GNUNET_FS_uri_sks_create (const struct GNUNET_CRYPTO_EcdsaPublicKey *ns,
907 struct GNUNET_FS_Uri *ns_uri;
909 ns_uri = GNUNET_new (struct GNUNET_FS_Uri);
910 ns_uri->type = GNUNET_FS_URI_SKS;
911 ns_uri->data.sks.ns = *ns;
912 ns_uri->data.sks.identifier = GNUNET_strdup (id);
918 * Merge the sets of keywords from two KSK URIs.
919 * (useful for merging the canonicalized keywords with
920 * the original keywords for sharing).
922 * @param u1 first uri
923 * @param u2 second uri
924 * @return merged URI, NULL on error
926 struct GNUNET_FS_Uri *
927 GNUNET_FS_uri_ksk_merge (const struct GNUNET_FS_Uri *u1,
928 const struct GNUNET_FS_Uri *u2)
930 struct GNUNET_FS_Uri *ret;
938 if ((u1 == NULL) && (u2 == NULL))
941 return GNUNET_FS_uri_dup (u2);
943 return GNUNET_FS_uri_dup (u1);
944 if ((u1->type != GNUNET_FS_URI_KSK) || (u2->type != GNUNET_FS_URI_KSK))
949 kc = u1->data.ksk.keywordCount;
950 kl = GNUNET_new_array (kc + u2->data.ksk.keywordCount,
952 for (i = 0; i < u1->data.ksk.keywordCount; i++)
953 kl[i] = GNUNET_strdup (u1->data.ksk.keywords[i]);
954 for (i = 0; i < u2->data.ksk.keywordCount; i++)
956 kp = u2->data.ksk.keywords[i];
958 for (j = 0; j < u1->data.ksk.keywordCount; j++)
959 if (0 == strcmp (kp + 1, kl[j] + 1))
967 kl[kc++] = GNUNET_strdup (kp);
969 ret = GNUNET_new (struct GNUNET_FS_Uri);
970 ret->type = GNUNET_FS_URI_KSK;
971 ret->data.ksk.keywordCount = kc;
972 ret->data.ksk.keywords = kl;
980 * @param uri the URI to duplicate
981 * @return copy of the URI
983 struct GNUNET_FS_Uri *
984 GNUNET_FS_uri_dup (const struct GNUNET_FS_Uri *uri)
986 struct GNUNET_FS_Uri *ret;
991 ret = GNUNET_new (struct GNUNET_FS_Uri);
992 GNUNET_memcpy (ret, uri, sizeof (struct GNUNET_FS_Uri));
995 case GNUNET_FS_URI_KSK:
996 if (ret->data.ksk.keywordCount >=
997 GNUNET_MAX_MALLOC_CHECKED / sizeof (char *))
1003 if (ret->data.ksk.keywordCount > 0)
1005 ret->data.ksk.keywords
1006 = GNUNET_new_array (ret->data.ksk.keywordCount,
1008 for (i = 0; i < ret->data.ksk.keywordCount; i++)
1009 ret->data.ksk.keywords[i] = GNUNET_strdup (uri->data.ksk.keywords[i]);
1012 ret->data.ksk.keywords = NULL; /* just to be sure */
1014 case GNUNET_FS_URI_SKS:
1015 ret->data.sks.identifier = GNUNET_strdup (uri->data.sks.identifier);
1017 case GNUNET_FS_URI_LOC:
1027 * Create an FS URI from a single user-supplied string of keywords.
1028 * The string is broken up at spaces into individual keywords.
1029 * Keywords that start with "+" are mandatory. Double-quotes can
1030 * be used to prevent breaking up strings at spaces (and also
1031 * to specify non-mandatory keywords starting with "+").
1033 * Keywords must contain a balanced number of double quotes and
1034 * double quotes can not be used in the actual keywords (for
1035 * example, the string '""foo bar""' will be turned into two
1036 * "OR"ed keywords 'foo' and 'bar', not into '"foo bar"'.
1038 * @param keywords the keyword string
1039 * @param emsg where to store an error message
1040 * @return an FS URI for the given keywords, NULL
1041 * if keywords is not legal (i.e. empty).
1043 struct GNUNET_FS_Uri *
1044 GNUNET_FS_uri_ksk_create (const char *keywords,
1048 unsigned int num_Words;
1051 struct GNUNET_FS_Uri *uri;
1055 if (keywords == NULL)
1057 *emsg = GNUNET_strdup (_("No keywords specified!\n"));
1061 searchString = GNUNET_strdup (keywords);
1066 while ('\0' != *pos)
1068 if ((saw_quote == 0) && (isspace ((unsigned char) *pos)))
1072 else if (0 == inWord)
1078 saw_quote = (saw_quote + 1) % 2;
1083 GNUNET_free (searchString);
1084 *emsg = GNUNET_strdup (_("No keywords specified!\n"));
1089 GNUNET_free (searchString);
1090 *emsg = GNUNET_strdup (_("Number of double-quotes not balanced!\n"));
1093 keywordarr = GNUNET_new_array (num_Words,
1098 while ('\0' != *pos)
1100 if ((saw_quote == 0) && (isspace ((unsigned char) *pos)))
1105 else if (0 == inWord)
1107 keywordarr[num_Words] = pos;
1112 saw_quote = (saw_quote + 1) % 2;
1116 GNUNET_FS_uri_ksk_create_from_args (num_Words,
1117 (const char **) keywordarr);
1118 GNUNET_free (keywordarr);
1119 GNUNET_free (searchString);
1125 * Create an FS URI from a user-supplied command line of keywords.
1126 * Arguments should start with "+" to indicate mandatory
1129 * @param argc number of keywords
1130 * @param argv keywords (double quotes are not required for
1131 * keywords containing spaces; however, double
1132 * quotes are required for keywords starting with
1133 * "+"); there is no mechanism for having double
1134 * quotes in the actual keywords (if the user
1135 * did specifically specify double quotes, the
1136 * caller should convert each double quote
1137 * into two single quotes).
1138 * @return an FS URI for the given keywords, NULL
1139 * if keywords is not legal (i.e. empty).
1141 struct GNUNET_FS_Uri *
1142 GNUNET_FS_uri_ksk_create_from_args (unsigned int argc,
1146 struct GNUNET_FS_Uri *uri;
1147 const char *keyword;
1155 /* allow URI to be given as one and only keyword and
1156 * handle accordingly */
1158 if ((argc == 1) && (strlen (argv[0]) > strlen (GNUNET_FS_URI_PREFIX)) &&
1160 strncmp (argv[0], GNUNET_FS_URI_PREFIX, strlen (GNUNET_FS_URI_PREFIX)))
1161 && (NULL != (uri = GNUNET_FS_uri_parse (argv[0], &emsg))))
1163 GNUNET_free_non_null (emsg);
1164 uri = GNUNET_new (struct GNUNET_FS_Uri);
1165 uri->type = GNUNET_FS_URI_KSK;
1166 uri->data.ksk.keywordCount = argc;
1167 uri->data.ksk.keywords = GNUNET_new_array (argc,
1169 for (i = 0; i < argc; i++)
1172 if (keyword[0] == '+')
1173 val = GNUNET_strdup (keyword);
1175 GNUNET_asprintf (&val, " %s", keyword);
1186 uri->data.ksk.keywords[i] = val;
1193 * Test if two URIs are equal.
1195 * @param u1 one of the URIs
1196 * @param u2 the other URI
1197 * @return #GNUNET_YES if the URIs are equal
1200 GNUNET_FS_uri_test_equal (const struct GNUNET_FS_Uri *u1,
1201 const struct GNUNET_FS_Uri *u2)
1207 GNUNET_assert (u1 != NULL);
1208 GNUNET_assert (u2 != NULL);
1209 if (u1->type != u2->type)
1213 case GNUNET_FS_URI_CHK:
1215 memcmp (&u1->data.chk, &u2->data.chk, sizeof (struct FileIdentifier)))
1218 case GNUNET_FS_URI_SKS:
1220 memcmp (&u1->data.sks.ns, &u2->data.sks.ns,
1221 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey))) &&
1222 (0 == strcmp (u1->data.sks.identifier, u2->data.sks.identifier)))
1226 case GNUNET_FS_URI_KSK:
1227 if (u1->data.ksk.keywordCount != u2->data.ksk.keywordCount)
1229 for (i = 0; i < u1->data.ksk.keywordCount; i++)
1232 for (j = 0; j < u2->data.ksk.keywordCount; j++)
1234 if (0 == strcmp (u1->data.ksk.keywords[i], u2->data.ksk.keywords[j]))
1240 if (ret == GNUNET_NO)
1244 case GNUNET_FS_URI_LOC:
1246 (&u1->data.loc, &u2->data.loc,
1247 sizeof (struct FileIdentifier) +
1248 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey) +
1249 sizeof (struct GNUNET_TIME_Absolute) + sizeof (unsigned short) +
1250 sizeof (unsigned short)) != 0)
1260 * Is this a namespace URI?
1262 * @param uri the uri to check
1263 * @return #GNUNET_YES if this is an SKS uri
1266 GNUNET_FS_uri_test_sks (const struct GNUNET_FS_Uri *uri)
1268 return uri->type == GNUNET_FS_URI_SKS;
1273 * Get the ID of a namespace from the given
1276 * @param uri the uri to get the namespace ID from
1277 * @param pseudonym where to store the ID of the namespace
1278 * @return #GNUNET_OK on success
1281 GNUNET_FS_uri_sks_get_namespace (const struct GNUNET_FS_Uri *uri,
1282 struct GNUNET_CRYPTO_EcdsaPublicKey *pseudonym)
1284 if (!GNUNET_FS_uri_test_sks (uri))
1287 return GNUNET_SYSERR;
1289 *pseudonym = uri->data.sks.ns;
1295 * Get the content identifier of an SKS URI.
1297 * @param uri the sks uri
1298 * @return NULL on error (not a valid SKS URI)
1301 GNUNET_FS_uri_sks_get_content_id (const struct GNUNET_FS_Uri *uri)
1303 if (!GNUNET_FS_uri_test_sks (uri))
1308 return GNUNET_strdup (uri->data.sks.identifier);
1313 * Is this a keyword URI?
1315 * @param uri the uri
1316 * @return #GNUNET_YES if this is a KSK uri
1319 GNUNET_FS_uri_test_ksk (const struct GNUNET_FS_Uri *uri)
1324 if (uri->type == GNUNET_FS_URI_KSK)
1326 for (i=0;i < uri->data.ksk.keywordCount; i++)
1327 GNUNET_assert (uri->data.ksk.keywords[i] != NULL);
1330 return uri->type == GNUNET_FS_URI_KSK;
1335 * Is this a file (or directory) URI?
1337 * @param uri the uri to check
1338 * @return #GNUNET_YES if this is a CHK uri
1341 GNUNET_FS_uri_test_chk (const struct GNUNET_FS_Uri *uri)
1343 return uri->type == GNUNET_FS_URI_CHK;
1348 * What is the size of the file that this URI
1351 * @param uri the CHK URI to inspect
1352 * @return size of the file as specified in the CHK URI
1355 GNUNET_FS_uri_chk_get_file_size (const struct GNUNET_FS_Uri * uri)
1359 case GNUNET_FS_URI_CHK:
1360 return GNUNET_ntohll (uri->data.chk.file_length);
1361 case GNUNET_FS_URI_LOC:
1362 return GNUNET_ntohll (uri->data.loc.fi.file_length);
1366 return 0; /* unreachable */
1371 * Is this a location URI?
1373 * @param uri the uri to check
1374 * @return #GNUNET_YES if this is a LOC uri
1377 GNUNET_FS_uri_test_loc (const struct GNUNET_FS_Uri *uri)
1379 return uri->type == GNUNET_FS_URI_LOC;
1384 * Add a keyword as non-mandatory (with ' '-prefix) to the
1385 * given keyword list at offset 'index'. The array is
1386 * guaranteed to be long enough.
1388 * @param s keyword to add
1389 * @param array array to add the keyword to
1390 * @param index offset where to add the keyword
1393 insert_non_mandatory_keyword (const char *s,
1399 GNUNET_asprintf (&nkword,
1400 " %s", /* space to mark as 'non mandatory' */
1402 array[index] = nkword;
1407 * Test if the given keyword @a s is already present in the
1408 * given array, ignoring the '+'-mandatory prefix in the array.
1410 * @param s keyword to test
1411 * @param array keywords to test against, with ' ' or '+' prefix to ignore
1412 * @param array_length length of the @a array
1413 * @return #GNUNET_YES if the keyword exists, #GNUNET_NO if not
1416 find_duplicate (const char *s,
1422 for (j = array_length - 1; j >= 0; j--)
1423 if (0 == strcmp (&array[j][1], s))
1433 normalize_metadata (enum EXTRACTOR_MetaFormat format,
1437 uint8_t *free_str = NULL;
1438 uint8_t *str_to_normalize = (uint8_t *) data;
1439 uint8_t *normalized;
1441 if (str_to_normalize == NULL)
1443 /* Don't trust libextractor */
1444 if (format == EXTRACTOR_METAFORMAT_UTF8)
1446 free_str = (uint8_t *) u8_check ((const uint8_t *) data, data_len);
1447 if (free_str == NULL)
1450 format = EXTRACTOR_METAFORMAT_C_STRING;
1452 if (format == EXTRACTOR_METAFORMAT_C_STRING)
1454 free_str = u8_strconv_from_encoding (data, locale_charset (), iconveh_escape_sequence);
1455 if (free_str == NULL)
1459 normalized = u8_tolower (str_to_normalize, strlen ((char *) str_to_normalize), NULL, UNINORM_NFD, NULL, &r_len);
1460 /* free_str is allocated by libunistring internally, use free() */
1461 if (free_str != NULL)
1463 if (normalized != NULL)
1465 /* u8_tolower allocates a non-NULL-terminated string! */
1466 free_str = GNUNET_malloc (r_len + 1);
1467 GNUNET_memcpy (free_str, normalized, r_len);
1468 free_str[r_len] = '\0';
1470 normalized = free_str;
1472 return (char *) normalized;
1477 * Counts the number of UTF-8 characters (not bytes) in the string,
1478 * returns that count.
1481 u8_strcount (const uint8_t *s)
1485 GNUNET_assert (s != NULL);
1488 for (count = 0; s != NULL; count++)
1489 s = u8_next (&c, s);
1495 * Break the filename up by matching [], () and {} pairs to make
1496 * keywords. In case of nesting parentheses only the inner pair counts.
1497 * You can't escape parentheses to scan something like "[blah\{foo]" to
1498 * make a "blah{foo" keyword, this function is only a heuristic!
1500 * @param s string to break down.
1501 * @param array array to fill with enclosed tokens. If NULL, then tokens
1503 * @param index index at which to start filling the array (entries prior
1504 * to it are used to check for duplicates). ignored if @a array == NULL.
1505 * @return number of tokens counted (including duplicates), or number of
1506 * tokens extracted (excluding duplicates). 0 if there are no
1507 * matching parens in the string (when counting), or when all tokens
1508 * were duplicates (when extracting).
1511 get_keywords_from_parens (const char *s,
1523 ss = GNUNET_strdup (s);
1524 open_paren = ss - 1;
1525 while (NULL != (open_paren = strpbrk (open_paren + 1, "[{(")))
1529 close_paren = strpbrk (open_paren + 1, "]})");
1530 if (NULL == close_paren)
1532 switch (open_paren[0])
1535 if (']' == close_paren[0])
1539 if ('}' == close_paren[0])
1543 if (')' == close_paren[0])
1549 if (match && (close_paren - open_paren > 1))
1551 tmp = close_paren[0];
1552 close_paren[0] = '\0';
1553 /* Keywords must be at least 3 characters long */
1554 if (u8_strcount ((const uint8_t *) &open_paren[1]) <= 2)
1556 close_paren[0] = tmp;
1562 if (GNUNET_NO == find_duplicate ((const char *) &open_paren[1],
1563 (const char **) array, index + count))
1565 insert_non_mandatory_keyword ((const char *) &open_paren[1], array,
1569 normalized = normalize_metadata (EXTRACTOR_METAFORMAT_UTF8,
1570 &open_paren[1], close_paren - &open_paren[1]);
1571 if (normalized != NULL)
1573 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1574 (const char **) array, index + count))
1576 insert_non_mandatory_keyword ((const char *) normalized, array,
1580 GNUNET_free (normalized);
1585 close_paren[0] = tmp;
1594 * Where to break up keywords
1596 #define TOKENS "_. /-!?#&+@\"\'\\;:,()[]{}$<>|"
1599 * Break the filename up by TOKENS to make
1602 * @param s string to break down.
1603 * @param array array to fill with tokens. If NULL, then tokens are only
1605 * @param index index at which to start filling the array (entries prior
1606 * to it are used to check for duplicates). ignored if @a array == NULL.
1607 * @return number of tokens (>1) counted (including duplicates), or number of
1608 * tokens extracted (excluding duplicates). 0 if there are no
1609 * separators in the string (when counting), or when all tokens were
1610 * duplicates (when extracting).
1613 get_keywords_from_tokens (const char *s,
1621 ss = GNUNET_strdup (s);
1622 for (p = strtok (ss, TOKENS); p != NULL; p = strtok (NULL, TOKENS))
1624 /* Keywords must be at least 3 characters long */
1625 if (u8_strcount ((const uint8_t *) p) <= 2)
1630 if (GNUNET_NO == find_duplicate (p, (const char **) array, index + seps))
1632 insert_non_mandatory_keyword (p, array,
1636 normalized = normalize_metadata (EXTRACTOR_METAFORMAT_UTF8,
1638 if (normalized != NULL)
1640 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1641 (const char **) array, index + seps))
1643 insert_non_mandatory_keyword ((const char *) normalized, array,
1647 GNUNET_free (normalized);
1660 * Function called on each value in the meta data.
1661 * Adds it to the URI.
1663 * @param cls URI to update
1664 * @param plugin_name name of the plugin that produced this value;
1665 * special values can be used (i.e. '<zlib>' for zlib being
1666 * used in the main libextractor library and yielding
1668 * @param type libextractor-type describing the meta data
1669 * @param format basic format information about data
1670 * @param data_mime_type mime-type of data (not of the original file);
1671 * can be NULL (if mime-type is not known)
1672 * @param data actual meta-data found
1673 * @param data_len number of bytes in @a data
1674 * @return 0 (always)
1677 gather_uri_data (void *cls, const char *plugin_name,
1678 enum EXTRACTOR_MetaType type,
1679 enum EXTRACTOR_MetaFormat format,
1680 const char *data_mime_type,
1684 struct GNUNET_FS_Uri *uri = cls;
1685 char *normalized_data;
1688 if ((format != EXTRACTOR_METAFORMAT_UTF8) &&
1689 (format != EXTRACTOR_METAFORMAT_C_STRING))
1691 /* Keywords must be at least 3 characters long
1692 * If given non-utf8 string it will, most likely, find it to be invalid,
1693 * and will return the length of its valid part, skipping the keyword.
1694 * If it does - fix the extractor, not this check!
1696 if (u8_strcount ((const uint8_t *) data) <= 2)
1698 if ( (EXTRACTOR_METATYPE_MIMETYPE == type) &&
1699 (NULL != (sep = memchr (data, '/', data_len))) &&
1704 GNUNET_asprintf (&xtra,
1708 if (! find_duplicate (xtra,
1709 (const char **) uri->data.ksk.keywords,
1710 uri->data.ksk.keywordCount))
1712 insert_non_mandatory_keyword (xtra,
1713 uri->data.ksk.keywords,
1714 uri->data.ksk.keywordCount);
1715 uri->data.ksk.keywordCount++;
1720 normalized_data = normalize_metadata (format, data, data_len);
1721 if (! find_duplicate (data,
1722 (const char **) uri->data.ksk.keywords,
1723 uri->data.ksk.keywordCount))
1725 insert_non_mandatory_keyword (data,
1726 uri->data.ksk.keywords, uri->data.ksk.keywordCount);
1727 uri->data.ksk.keywordCount++;
1729 if (NULL != normalized_data)
1731 if (! find_duplicate (normalized_data,
1732 (const char **) uri->data.ksk.keywords,
1733 uri->data.ksk.keywordCount))
1735 insert_non_mandatory_keyword (normalized_data,
1736 uri->data.ksk.keywords, uri->data.ksk.keywordCount);
1737 uri->data.ksk.keywordCount++;
1739 GNUNET_free (normalized_data);
1746 * Construct a keyword-URI from meta-data (take all entries
1747 * in the meta-data and construct one large keyword URI
1748 * that lists all keywords that can be found in the meta-data).
1750 * @param md metadata to use
1751 * @return NULL on error, otherwise a KSK URI
1753 struct GNUNET_FS_Uri *
1754 GNUNET_FS_uri_ksk_create_from_meta_data (const struct GNUNET_CONTAINER_MetaData *md)
1756 struct GNUNET_FS_Uri *ret;
1758 char *full_name = NULL;
1761 int tok_keywords = 0;
1762 int paren_keywords = 0;
1766 ret = GNUNET_new (struct GNUNET_FS_Uri);
1767 ret->type = GNUNET_FS_URI_KSK;
1768 ent = GNUNET_CONTAINER_meta_data_iterate (md, NULL, NULL);
1771 full_name = GNUNET_CONTAINER_meta_data_get_first_by_types (md,
1772 EXTRACTOR_METATYPE_GNUNET_ORIGINAL_FILENAME, -1);
1773 if (NULL != full_name)
1775 filename = full_name;
1776 while (NULL != (ss = strstr (filename, DIR_SEPARATOR_STR)))
1778 tok_keywords = get_keywords_from_tokens (filename, NULL, 0);
1779 paren_keywords = get_keywords_from_parens (filename, NULL, 0);
1781 /* x3 because there might be a normalized variant of every keyword,
1782 plus theoretically one more for mime... */
1783 ret->data.ksk.keywords
1784 = GNUNET_new_array ((ent + tok_keywords + paren_keywords) * 3,
1786 GNUNET_CONTAINER_meta_data_iterate (md, &gather_uri_data, ret);
1788 if (tok_keywords > 0)
1789 ret->data.ksk.keywordCount += get_keywords_from_tokens (filename,
1790 ret->data.ksk.keywords,
1791 ret->data.ksk.keywordCount);
1792 if (paren_keywords > 0)
1793 ret->data.ksk.keywordCount += get_keywords_from_parens (filename,
1794 ret->data.ksk.keywords,
1795 ret->data.ksk.keywordCount);
1797 GNUNET_free_non_null (full_name);
1803 * In URI-encoding, does the given character
1804 * need to be encoded using %-encoding?
1807 needs_percent (char c)
1810 ((isalnum ((unsigned char) c)) || (c == '-') || (c == '_') ||
1811 (c == '.') || (c == '~')));
1816 * Convert a KSK URI to a string.
1818 * @param uri the URI to convert
1819 * @return NULL on error (i.e. keywordCount == 0)
1822 uri_ksk_to_string (const struct GNUNET_FS_Uri *uri)
1825 unsigned int keywordCount;
1832 const char *keyword;
1834 if (uri->type != GNUNET_FS_URI_KSK)
1836 keywords = uri->data.ksk.keywords;
1837 keywordCount = uri->data.ksk.keywordCount;
1838 n = keywordCount + strlen (GNUNET_FS_URI_PREFIX) +
1839 strlen (GNUNET_FS_URI_KSK_INFIX) + 1;
1840 for (i = 0; i < keywordCount; i++)
1842 keyword = keywords[i];
1843 slen = strlen (keyword);
1845 for (j = 0; j < slen; j++)
1847 if ((j == 0) && (keyword[j] == ' '))
1850 continue; /* skip leading space */
1852 if (needs_percent (keyword[j]))
1853 n += 2; /* will use %-encoding */
1856 ret = GNUNET_malloc (n);
1857 strcpy (ret, GNUNET_FS_URI_PREFIX);
1858 strcat (ret, GNUNET_FS_URI_KSK_INFIX);
1859 wpos = strlen (ret);
1860 for (i = 0; i < keywordCount; i++)
1862 keyword = keywords[i];
1863 slen = strlen (keyword);
1864 for (j = 0; j < slen; j++)
1866 if ((j == 0) && (keyword[j] == ' '))
1867 continue; /* skip leading space */
1868 if (needs_percent (keyword[j]))
1870 sprintf (&ret[wpos], "%%%02X", (unsigned char) keyword[j]);
1875 ret[wpos++] = keyword[j];
1878 if (i != keywordCount - 1)
1886 * Convert SKS URI to a string.
1888 * @param uri sks uri to convert
1889 * @return NULL on error
1892 uri_sks_to_string (const struct GNUNET_FS_Uri *uri)
1897 if (GNUNET_FS_URI_SKS != uri->type)
1899 ret = GNUNET_STRINGS_data_to_string (&uri->data.sks.ns,
1900 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
1903 GNUNET_assert (NULL != ret);
1905 GNUNET_asprintf (&ret, "%s%s%s/%s", GNUNET_FS_URI_PREFIX,
1906 GNUNET_FS_URI_SKS_INFIX, buf,
1907 uri->data.sks.identifier);
1913 * Convert a CHK URI to a string.
1915 * @param uri chk uri to convert
1916 * @return NULL on error
1919 uri_chk_to_string (const struct GNUNET_FS_Uri *uri)
1921 const struct FileIdentifier *fi;
1923 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1924 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1926 if (uri->type != GNUNET_FS_URI_CHK)
1928 fi = &uri->data.chk;
1929 GNUNET_CRYPTO_hash_to_enc (&fi->chk.key, &keyhash);
1930 GNUNET_CRYPTO_hash_to_enc (&fi->chk.query, &queryhash);
1932 GNUNET_asprintf (&ret, "%s%s%s.%s.%llu", GNUNET_FS_URI_PREFIX,
1933 GNUNET_FS_URI_CHK_INFIX, (const char *) &keyhash,
1934 (const char *) &queryhash, GNUNET_ntohll (fi->file_length));
1940 * Convert a LOC URI to a string.
1942 * @param uri loc uri to convert
1943 * @return NULL on error
1946 uri_loc_to_string (const struct GNUNET_FS_Uri *uri)
1949 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1950 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1952 char peer_sig[SIGNATURE_ASCII_LENGTH + 1];
1954 GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.key, &keyhash);
1955 GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.query, &queryhash);
1957 GNUNET_CRYPTO_eddsa_public_key_to_string (&uri->data.loc.peer.public_key);
1958 GNUNET_assert (NULL !=
1959 GNUNET_STRINGS_data_to_string (&uri->data.loc.contentSignature,
1960 sizeof (struct GNUNET_CRYPTO_EddsaSignature),
1962 sizeof (peer_sig)));
1963 GNUNET_asprintf (&ret,
1964 "%s%s%s.%s.%llu.%s.%s.%llu", GNUNET_FS_URI_PREFIX,
1965 GNUNET_FS_URI_LOC_INFIX, (const char *) &keyhash,
1966 (const char *) &queryhash,
1967 (unsigned long long) GNUNET_ntohll (uri->data.loc.
1971 (unsigned long long) uri->data.loc.expirationTime.abs_value_us / 1000000LL);
1972 GNUNET_free (peer_id);
1978 * Convert a URI to a UTF-8 String.
1980 * @param uri uri to convert to a string
1981 * @return the UTF-8 string
1984 GNUNET_FS_uri_to_string (const struct GNUNET_FS_Uri *uri)
1993 case GNUNET_FS_URI_KSK:
1994 return uri_ksk_to_string (uri);
1995 case GNUNET_FS_URI_SKS:
1996 return uri_sks_to_string (uri);
1997 case GNUNET_FS_URI_CHK:
1998 return uri_chk_to_string (uri);
1999 case GNUNET_FS_URI_LOC:
2000 return uri_loc_to_string (uri);
2007 /* end of fs_uri.c */