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.
18 * @brief Parses and produces uri strings.
19 * @author Igor Wronsky, Christian Grothoff
21 * GNUnet URIs are of the general form "gnunet://MODULE/IDENTIFIER".
22 * The specific structure of "IDENTIFIER" depends on the module and
23 * maybe differenciated into additional subcategories if applicable.
24 * This module only deals with fs identifiers (MODULE = "fs").
27 * This module only parses URIs for the AFS module. The FS URIs fall
28 * into four categories, "chk", "sks", "ksk" and "loc". The first three
29 * categories were named in analogy (!) to Freenet, but they do NOT
30 * work in exactly the same way. They are very similar from the user's
31 * point of view (unique file identifier, subspace, keyword), but the
32 * implementation is rather different in pretty much every detail.
33 * The concrete URI formats are:
37 * First, there are URIs that identify a file. They have the format
38 * "gnunet://fs/chk/HEX1.HEX2.SIZE". These URIs can be used to
39 * download the file. The description, filename, mime-type and other
40 * meta-data is NOT part of the file-URI since a URI uniquely
41 * identifies a resource (and the contents of the file would be the
42 * same even if it had a different description).
46 * The second category identifies entries in a namespace. The format
47 * is "gnunet://fs/sks/NAMESPACE/IDENTIFIER" where the namespace
48 * should be given in HEX. Applications may allow using a nickname
49 * for the namespace if the nickname is not ambiguous. The identifier
50 * can be either an ASCII sequence or a HEX-encoding. If the
51 * identifier is in ASCII but the format is ambiguous and could denote
52 * a HEX-string a "/" is appended to indicate ASCII encoding.
56 * The third category identifies ordinary searches. The format is
57 * "gnunet://fs/ksk/KEYWORD[+KEYWORD]*". Using the "+" syntax
58 * it is possible to encode searches with the boolean "AND" operator.
59 * "+" is used since it indicates a commutative 'and' operation and
60 * is unlikely to be used in a keyword by itself.
64 * The last category identifies a datum on a specific machine. The
65 * format is "gnunet://fs/loc/HEX1.HEX2.SIZE.PEER.SIG.EXPTIME". PEER is
66 * the BinName of the public key of the peer storing the datum. The
67 * signature (SIG) certifies that this peer has this content.
68 * HEX1, HEX2 and SIZE correspond to a 'chk' URI.
72 * The encoding for hexadecimal values is defined in the hashing.c
73 * module in the gnunetutil library and discussed there.
77 #include "gnunet_fs_service.h"
78 #include "gnunet_signatures.h"
89 * Get a unique key from a URI. This is for putting URIs
90 * into HashMaps. The key may change between FS implementations.
92 * @param uri uri to convert to a unique key
93 * @param key where to store the unique key
94 * @return #GNUNET_OK on success
97 GNUNET_FS_uri_to_key (const struct GNUNET_FS_Uri *uri,
98 struct GNUNET_HashCode *key)
102 case GNUNET_FS_URI_CHK:
103 *key = uri->data.chk.chk.query;
105 case GNUNET_FS_URI_SKS:
106 GNUNET_CRYPTO_hash (uri->data.sks.identifier,
107 strlen (uri->data.sks.identifier),
110 case GNUNET_FS_URI_KSK:
111 if (uri->data.ksk.keywordCount > 0)
113 GNUNET_CRYPTO_hash (uri->data.ksk.keywords[0],
114 strlen (uri->data.ksk.keywords[0]),
120 memset (key, 0, sizeof (struct GNUNET_HashCode));
121 return GNUNET_SYSERR;
124 case GNUNET_FS_URI_LOC:
125 GNUNET_CRYPTO_hash (&uri->data.loc.fi,
126 sizeof (struct FileIdentifier) +
127 sizeof (struct GNUNET_PeerIdentity),
131 memset (key, 0, sizeof (struct GNUNET_HashCode));
132 return GNUNET_SYSERR;
138 * Convert keyword URI to a human readable format
139 * (i.e. the search query that was used in the first place)
141 * @param uri ksk uri to convert to a string
142 * @return string with the keywords
145 GNUNET_FS_uri_ksk_to_string_fancy (const struct GNUNET_FS_Uri *uri)
152 unsigned int keywordCount;
154 if ((NULL == uri) || (GNUNET_FS_URI_KSK != uri->type))
159 keywords = uri->data.ksk.keywords;
160 keywordCount = uri->data.ksk.keywordCount;
161 n = keywordCount + 1;
162 for (i = 0; i < keywordCount; i++)
164 keyword = keywords[i];
165 n += strlen (keyword) - 1;
166 if (NULL != strstr (&keyword[1], " "))
168 if (keyword[0] == '+')
171 ret = GNUNET_malloc (n);
173 for (i = 0; i < keywordCount; i++)
175 keyword = keywords[i];
176 if (NULL != strstr (&keyword[1], " "))
179 if (keyword[0] == '+')
180 strcat (ret, keyword);
182 strcat (ret, &keyword[1]);
187 if (keyword[0] == '+')
188 strcat (ret, keyword);
190 strcat (ret, &keyword[1]);
199 * Given a keyword with %-encoding (and possibly quotes to protect
200 * spaces), return a copy of the keyword without %-encoding and
201 * without double-quotes (%22). Also, add a space at the beginning
202 * if there is not a '+'.
204 * @param in string with %-encoding
205 * @param emsg where to store the parser error message (if any)
206 * @return decodded string with leading space (or preserved plus)
209 percent_decode_keyword (const char *in,
218 out = GNUNET_strdup (in);
221 while (out[rpos] != '\0')
223 if (out[rpos] == '%')
225 if (1 != SSCANF (&out[rpos + 1], "%2X", &hx))
228 *emsg = GNUNET_strdup (_(/* xgettext:no-c-format */
229 "Malformed KSK URI (`%' must be followed by HEX number)"));
234 continue; /* skip double quote */
235 out[wpos++] = (char) hx;
239 out[wpos++] = out[rpos++];
245 ret = GNUNET_strdup (out);
249 /* need to prefix with space */
250 ret = GNUNET_malloc (strlen (out) + 2);
258 #define GNUNET_FS_URI_KSK_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_KSK_INFIX
263 * @param s an uri string
264 * @param emsg where to store the parser error message (if any)
265 * @return NULL on error, otherwise the KSK URI
267 static struct GNUNET_FS_Uri *
268 uri_ksk_parse (const char *s,
271 struct GNUNET_FS_Uri *ret;
282 pos = strlen (GNUNET_FS_URI_KSK_PREFIX);
283 if ((slen <= pos) || (0 != strncmp (s, GNUNET_FS_URI_KSK_PREFIX, pos)))
284 return NULL; /* not KSK URI */
285 if ((s[slen - 1] == '+') || (s[pos] == '+'))
288 GNUNET_strdup (_("Malformed KSK URI (must not begin or end with `+')"));
293 for (i = pos; i < slen; i++)
295 if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
297 saw_quote = (saw_quote + 1) % 2;
301 if ((s[i] == '+') && (saw_quote == 0))
306 *emsg = GNUNET_strdup (_("Malformed KSK URI (`++' not allowed)"));
313 *emsg = GNUNET_strdup (_("Malformed KSK URI (quotes not balanced)"));
317 dup = GNUNET_strdup (s);
318 keywords = GNUNET_new_array (max,
320 for (i = slen - 1; i >= (int) pos; i--)
322 if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
324 saw_quote = (saw_quote + 1) % 2;
327 if ((dup[i] == '+') && (saw_quote == 0))
329 keywords[--max] = percent_decode_keyword (&dup[i + 1], emsg);
330 if (NULL == keywords[max])
335 keywords[--max] = percent_decode_keyword (&dup[pos], emsg);
336 if (NULL == keywords[max])
338 GNUNET_assert (0 == max);
340 ret = GNUNET_new (struct GNUNET_FS_Uri);
341 ret->type = GNUNET_FS_URI_KSK;
342 ret->data.ksk.keywordCount = iret;
343 ret->data.ksk.keywords = keywords;
346 for (i = 0; i < max; i++)
347 GNUNET_free_non_null (keywords[i]);
348 GNUNET_free (keywords);
354 #define GNUNET_FS_URI_SKS_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_SKS_INFIX
359 * @param s an uri string
360 * @param emsg where to store the parser error message (if any)
361 * @return NULL on error, SKS URI otherwise
363 static struct GNUNET_FS_Uri *
364 uri_sks_parse (const char *s,
367 struct GNUNET_FS_Uri *ret;
368 struct GNUNET_CRYPTO_EcdsaPublicKey ns;
372 pos = strlen (GNUNET_FS_URI_SKS_PREFIX);
373 if ((strlen (s) <= pos) || (0 != strncmp (s, GNUNET_FS_URI_SKS_PREFIX, pos)))
374 return NULL; /* not an SKS URI */
375 end = strchr (&s[pos], '/');
376 if ( (NULL == end) ||
378 GNUNET_STRINGS_string_to_data (&s[pos],
383 *emsg = GNUNET_strdup (_("Malformed SKS URI (wrong syntax)"));
384 return NULL; /* malformed */
386 end++; /* skip over '/' */
387 ret = GNUNET_new (struct GNUNET_FS_Uri);
388 ret->type = GNUNET_FS_URI_SKS;
389 ret->data.sks.ns = ns;
390 ret->data.sks.identifier = GNUNET_strdup (end);
394 #define GNUNET_FS_URI_CHK_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX
400 * @param s an uri string
401 * @param emsg where to store the parser error message (if any)
402 * @return NULL on error, CHK URI otherwise
404 static struct GNUNET_FS_Uri *
405 uri_chk_parse (const char *s,
408 struct GNUNET_FS_Uri *ret;
409 struct FileIdentifier fi;
411 unsigned long long flen;
413 char h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
414 char h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
417 pos = strlen (GNUNET_FS_URI_CHK_PREFIX);
418 if ((slen < pos + 2 * sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
419 (0 != strncmp (s, GNUNET_FS_URI_CHK_PREFIX, pos)))
420 return NULL; /* not a CHK URI */
421 if ((s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
422 (s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
424 *emsg = GNUNET_strdup (_("Malformed CHK URI (wrong syntax)"));
427 GNUNET_memcpy (h1, &s[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
428 h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
429 GNUNET_memcpy (h2, &s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)],
430 sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
431 h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
433 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &fi.chk.key)) ||
434 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &fi.chk.query)) ||
436 SSCANF (&s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
439 *emsg = GNUNET_strdup (_("Malformed CHK URI (failed to decode CHK)"));
442 fi.file_length = GNUNET_htonll (flen);
443 ret = GNUNET_new (struct GNUNET_FS_Uri);
444 ret->type = GNUNET_FS_URI_CHK;
450 GNUNET_NETWORK_STRUCT_BEGIN
452 * Structure that defines how the contents of a location URI must be
453 * assembled in memory to create or verify the signature of a location
456 struct LocUriAssembly
459 * What is being signed (rest of this struct).
461 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
464 * Expiration time of the offer.
466 struct GNUNET_TIME_AbsoluteNBO exptime;
469 * File being offered.
471 struct FileIdentifier fi;
474 * Peer offering the file.
476 struct GNUNET_PeerIdentity peer;
479 GNUNET_NETWORK_STRUCT_END
482 #define GNUNET_FS_URI_LOC_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_LOC_INFIX
484 #define SIGNATURE_ASCII_LENGTH 103
488 * Also verifies validity of the location URI.
490 * @param s an uri string
491 * @param emsg where to store the parser error message (if any)
492 * @return NULL on error, valid LOC URI otherwise
494 static struct GNUNET_FS_Uri *
495 uri_loc_parse (const char *s,
498 struct GNUNET_FS_Uri *uri;
499 char h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
500 char h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
503 unsigned long long exptime;
504 unsigned long long flen;
505 struct GNUNET_TIME_Absolute et;
506 struct GNUNET_CRYPTO_EddsaSignature sig;
507 struct LocUriAssembly ass;
511 pos = strlen (GNUNET_FS_URI_LOC_PREFIX);
512 if ((slen < pos + 2 * sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
513 (0 != strncmp (s, GNUNET_FS_URI_LOC_PREFIX, pos)))
514 return NULL; /* not a LOC URI */
515 if ((s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
516 (s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
518 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax)"));
521 GNUNET_memcpy (h1, &s[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
522 h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
523 GNUNET_memcpy (h2, &s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)],
524 sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
525 h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
527 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &ass.fi.chk.key)) ||
528 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &ass.fi.chk.query)) ||
530 SSCANF (&s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
533 *emsg = GNUNET_strdup (_("LOC URI malformed (no CHK)"));
536 ass.fi.file_length = GNUNET_htonll (flen);
538 npos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2;
539 while ((s[npos] != '\0') && (s[npos] != '.'))
543 *emsg = GNUNET_strdup (_("LOC URI malformed (missing LOC)"));
547 if ( (strlen (&s[npos]) <= GNUNET_CRYPTO_PKEY_ASCII_LENGTH + 1) ||
548 ('.' != s[npos+GNUNET_CRYPTO_PKEY_ASCII_LENGTH]) )
551 GNUNET_strdup (_("LOC URI malformed (wrong syntax for public key)"));
554 GNUNET_CRYPTO_eddsa_public_key_from_string (&s[npos],
555 GNUNET_CRYPTO_PKEY_ASCII_LENGTH,
556 &ass.peer.public_key))
559 GNUNET_strdup (_("LOC URI malformed (could not decode public key)"));
562 npos += GNUNET_CRYPTO_PKEY_ASCII_LENGTH;
563 if (s[npos++] != '.')
565 *emsg = GNUNET_strdup (_("LOC URI malformed (could not find signature)"));
568 if ( (strlen (&s[npos]) <= SIGNATURE_ASCII_LENGTH + 1) ||
569 ('.' != s[npos + SIGNATURE_ASCII_LENGTH]) )
571 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax for signature)"));
575 GNUNET_STRINGS_string_to_data (&s[npos],
576 SIGNATURE_ASCII_LENGTH,
578 sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
580 *emsg = GNUNET_strdup (_("LOC URI malformed (could not decode signature)"));
583 npos += SIGNATURE_ASCII_LENGTH;
584 if (s[npos++] != '.')
586 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax for expiration time)"));
589 if (1 != SSCANF (&s[npos], "%llu", &exptime))
592 GNUNET_strdup (_("LOC URI malformed (could not parse expiration time)"));
595 ass.purpose.size = htonl (sizeof (struct LocUriAssembly));
596 ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
597 et.abs_value_us = exptime * 1000LL * 1000LL;
598 ass.exptime = GNUNET_TIME_absolute_hton (et);
600 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT,
601 &ass.purpose, &sig, &ass.peer.public_key))
604 GNUNET_strdup (_("LOC URI malformed (signature failed validation)"));
607 uri = GNUNET_new (struct GNUNET_FS_Uri);
608 uri->type = GNUNET_FS_URI_LOC;
609 uri->data.loc.fi = ass.fi;
610 uri->data.loc.peer = ass.peer;
611 uri->data.loc.expirationTime = et;
612 uri->data.loc.contentSignature = sig;
621 * Convert a UTF-8 String to a URI.
623 * @param uri string to parse
624 * @param emsg where to store the parser error message (if any)
625 * @return NULL on error
627 struct GNUNET_FS_Uri *
628 GNUNET_FS_uri_parse (const char *uri,
631 struct GNUNET_FS_Uri *ret;
638 *emsg = GNUNET_strdup (_("invalid argument"));
644 if ((NULL != (ret = uri_chk_parse (uri, emsg))) ||
645 (NULL != (ret = uri_ksk_parse (uri, emsg))) ||
646 (NULL != (ret = uri_sks_parse (uri, emsg))) ||
647 (NULL != (ret = uri_loc_parse (uri, emsg))))
650 *emsg = GNUNET_strdup (_("Unrecognized URI type"));
660 * @param uri uri to free
663 GNUNET_FS_uri_destroy (struct GNUNET_FS_Uri *uri)
669 case GNUNET_FS_URI_KSK:
670 for (i = 0; i < uri->data.ksk.keywordCount; i++)
671 GNUNET_free (uri->data.ksk.keywords[i]);
672 GNUNET_array_grow (uri->data.ksk.keywords, uri->data.ksk.keywordCount, 0);
674 case GNUNET_FS_URI_SKS:
675 GNUNET_free (uri->data.sks.identifier);
677 case GNUNET_FS_URI_LOC:
688 * How many keywords are ANDed in this keyword URI?
690 * @param uri ksk uri to get the number of keywords from
691 * @return 0 if this is not a keyword URI
694 GNUNET_FS_uri_ksk_get_keyword_count (const struct GNUNET_FS_Uri *uri)
696 if (uri->type != GNUNET_FS_URI_KSK)
698 return uri->data.ksk.keywordCount;
703 * Iterate over all keywords in this keyword URI.
705 * @param uri ksk uri to get the keywords from
706 * @param iterator function to call on each keyword
707 * @param iterator_cls closure for iterator
708 * @return -1 if this is not a keyword URI, otherwise number of
709 * keywords iterated over until iterator aborted
712 GNUNET_FS_uri_ksk_get_keywords (const struct GNUNET_FS_Uri *uri,
713 GNUNET_FS_KeywordIterator iterator,
719 if (uri->type != GNUNET_FS_URI_KSK)
721 if (NULL == iterator)
722 return uri->data.ksk.keywordCount;
723 for (i = 0; i < uri->data.ksk.keywordCount; i++)
725 keyword = uri->data.ksk.keywords[i];
726 /* first character of keyword indicates
727 * if it is mandatory or not */
728 if (GNUNET_OK != iterator (iterator_cls, &keyword[1], keyword[0] == '+'))
736 * Add the given keyword to the set of keywords represented by the URI.
737 * Does nothing if the keyword is already present.
739 * @param uri ksk uri to modify
740 * @param keyword keyword to add
741 * @param is_mandatory is this keyword mandatory?
744 GNUNET_FS_uri_ksk_add_keyword (struct GNUNET_FS_Uri *uri,
752 GNUNET_assert (uri->type == GNUNET_FS_URI_KSK);
753 for (i = 0; i < uri->data.ksk.keywordCount; i++)
755 old = uri->data.ksk.keywords[i];
756 if (0 == strcmp (&old[1], keyword))
759 GNUNET_asprintf (&n, is_mandatory ? "+%s" : " %s", keyword);
760 GNUNET_array_append (uri->data.ksk.keywords, uri->data.ksk.keywordCount, n);
765 * Remove the given keyword from the set of keywords represented by the URI.
766 * Does nothing if the keyword is not present.
768 * @param uri ksk uri to modify
769 * @param keyword keyword to add
772 GNUNET_FS_uri_ksk_remove_keyword (struct GNUNET_FS_Uri *uri,
778 GNUNET_assert (uri->type == GNUNET_FS_URI_KSK);
779 for (i = 0; i < uri->data.ksk.keywordCount; i++)
781 old = uri->data.ksk.keywords[i];
782 if (0 == strcmp (&old[1], keyword))
784 uri->data.ksk.keywords[i] =
785 uri->data.ksk.keywords[uri->data.ksk.keywordCount - 1];
786 GNUNET_array_grow (uri->data.ksk.keywords, uri->data.ksk.keywordCount,
787 uri->data.ksk.keywordCount - 1);
796 * Obtain the identity of the peer offering the data
798 * @param uri the location URI to inspect
799 * @param peer where to store the identify of the peer (presumably) offering the content
800 * @return #GNUNET_SYSERR if this is not a location URI, otherwise #GNUNET_OK
803 GNUNET_FS_uri_loc_get_peer_identity (const struct GNUNET_FS_Uri *uri,
804 struct GNUNET_PeerIdentity *peer)
806 if (uri->type != GNUNET_FS_URI_LOC)
807 return GNUNET_SYSERR;
808 *peer = uri->data.loc.peer;
814 * Obtain the expiration of the LOC URI.
816 * @param uri location URI to get the expiration from
817 * @return expiration time of the URI
819 struct GNUNET_TIME_Absolute
820 GNUNET_FS_uri_loc_get_expiration (const struct GNUNET_FS_Uri *uri)
822 GNUNET_assert (uri->type == GNUNET_FS_URI_LOC);
823 return uri->data.loc.expirationTime;
828 * Obtain the URI of the content itself.
830 * @param uri location URI to get the content URI from
831 * @return NULL if argument is not a location URI
833 struct GNUNET_FS_Uri *
834 GNUNET_FS_uri_loc_get_uri (const struct GNUNET_FS_Uri *uri)
836 struct GNUNET_FS_Uri *ret;
838 if (uri->type != GNUNET_FS_URI_LOC)
840 ret = GNUNET_new (struct GNUNET_FS_Uri);
841 ret->type = GNUNET_FS_URI_CHK;
842 ret->data.chk = uri->data.loc.fi;
848 * Construct a location URI (this peer will be used for the location).
849 * This function should only be called from within gnunet-service-fs,
850 * as it requires the peer's private key which is generally unavailable
851 * to processes directly under the user's control. However, for
852 * testing and as it logically fits under URIs, it is in this API.
854 * @param base_uri content offered by the sender
855 * @param sign_key private key of the peer
856 * @param expiration_time how long will the content be offered?
857 * @return the location URI, NULL on error
859 struct GNUNET_FS_Uri *
860 GNUNET_FS_uri_loc_create (const struct GNUNET_FS_Uri *base_uri,
861 const struct GNUNET_CRYPTO_EddsaPrivateKey *sign_key,
862 struct GNUNET_TIME_Absolute expiration_time)
864 struct GNUNET_FS_Uri *uri;
865 struct GNUNET_CRYPTO_EddsaPublicKey my_public_key;
866 struct LocUriAssembly ass;
867 struct GNUNET_TIME_Absolute et;
869 if (GNUNET_FS_URI_CHK != base_uri->type)
871 /* we round expiration time to full seconds for SKS URIs */
872 et.abs_value_us = (expiration_time.abs_value_us / 1000000LL) * 1000000LL;
873 GNUNET_CRYPTO_eddsa_key_get_public (sign_key,
875 ass.purpose.size = htonl (sizeof (struct LocUriAssembly));
876 ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
877 ass.exptime = GNUNET_TIME_absolute_hton (et);
878 ass.fi = base_uri->data.chk;
879 ass.peer.public_key = my_public_key;
880 uri = GNUNET_new (struct GNUNET_FS_Uri);
881 uri->type = GNUNET_FS_URI_LOC;
882 uri->data.loc.fi = base_uri->data.chk;
883 uri->data.loc.expirationTime = et;
884 uri->data.loc.peer.public_key = my_public_key;
885 GNUNET_assert (GNUNET_OK ==
886 GNUNET_CRYPTO_eddsa_sign (sign_key,
888 &uri->data.loc.contentSignature));
894 * Create an SKS URI from a namespace ID and an identifier.
896 * @param ns namespace ID
897 * @param id identifier
898 * @return an FS URI for the given namespace and identifier
900 struct GNUNET_FS_Uri *
901 GNUNET_FS_uri_sks_create (const struct GNUNET_CRYPTO_EcdsaPublicKey *ns,
904 struct GNUNET_FS_Uri *ns_uri;
906 ns_uri = GNUNET_new (struct GNUNET_FS_Uri);
907 ns_uri->type = GNUNET_FS_URI_SKS;
908 ns_uri->data.sks.ns = *ns;
909 ns_uri->data.sks.identifier = GNUNET_strdup (id);
915 * Merge the sets of keywords from two KSK URIs.
916 * (useful for merging the canonicalized keywords with
917 * the original keywords for sharing).
919 * @param u1 first uri
920 * @param u2 second uri
921 * @return merged URI, NULL on error
923 struct GNUNET_FS_Uri *
924 GNUNET_FS_uri_ksk_merge (const struct GNUNET_FS_Uri *u1,
925 const struct GNUNET_FS_Uri *u2)
927 struct GNUNET_FS_Uri *ret;
935 if ((u1 == NULL) && (u2 == NULL))
938 return GNUNET_FS_uri_dup (u2);
940 return GNUNET_FS_uri_dup (u1);
941 if ((u1->type != GNUNET_FS_URI_KSK) || (u2->type != GNUNET_FS_URI_KSK))
946 kc = u1->data.ksk.keywordCount;
947 kl = GNUNET_new_array (kc + u2->data.ksk.keywordCount,
949 for (i = 0; i < u1->data.ksk.keywordCount; i++)
950 kl[i] = GNUNET_strdup (u1->data.ksk.keywords[i]);
951 for (i = 0; i < u2->data.ksk.keywordCount; i++)
953 kp = u2->data.ksk.keywords[i];
955 for (j = 0; j < u1->data.ksk.keywordCount; j++)
956 if (0 == strcmp (kp + 1, kl[j] + 1))
964 kl[kc++] = GNUNET_strdup (kp);
966 ret = GNUNET_new (struct GNUNET_FS_Uri);
967 ret->type = GNUNET_FS_URI_KSK;
968 ret->data.ksk.keywordCount = kc;
969 ret->data.ksk.keywords = kl;
977 * @param uri the URI to duplicate
978 * @return copy of the URI
980 struct GNUNET_FS_Uri *
981 GNUNET_FS_uri_dup (const struct GNUNET_FS_Uri *uri)
983 struct GNUNET_FS_Uri *ret;
988 ret = GNUNET_new (struct GNUNET_FS_Uri);
989 GNUNET_memcpy (ret, uri, sizeof (struct GNUNET_FS_Uri));
992 case GNUNET_FS_URI_KSK:
993 if (ret->data.ksk.keywordCount >=
994 GNUNET_MAX_MALLOC_CHECKED / sizeof (char *))
1000 if (ret->data.ksk.keywordCount > 0)
1002 ret->data.ksk.keywords
1003 = GNUNET_new_array (ret->data.ksk.keywordCount,
1005 for (i = 0; i < ret->data.ksk.keywordCount; i++)
1006 ret->data.ksk.keywords[i] = GNUNET_strdup (uri->data.ksk.keywords[i]);
1009 ret->data.ksk.keywords = NULL; /* just to be sure */
1011 case GNUNET_FS_URI_SKS:
1012 ret->data.sks.identifier = GNUNET_strdup (uri->data.sks.identifier);
1014 case GNUNET_FS_URI_LOC:
1024 * Create an FS URI from a single user-supplied string of keywords.
1025 * The string is broken up at spaces into individual keywords.
1026 * Keywords that start with "+" are mandatory. Double-quotes can
1027 * be used to prevent breaking up strings at spaces (and also
1028 * to specify non-mandatory keywords starting with "+").
1030 * Keywords must contain a balanced number of double quotes and
1031 * double quotes can not be used in the actual keywords (for
1032 * example, the string '""foo bar""' will be turned into two
1033 * "OR"ed keywords 'foo' and 'bar', not into '"foo bar"'.
1035 * @param keywords the keyword string
1036 * @param emsg where to store an error message
1037 * @return an FS URI for the given keywords, NULL
1038 * if keywords is not legal (i.e. empty).
1040 struct GNUNET_FS_Uri *
1041 GNUNET_FS_uri_ksk_create (const char *keywords,
1045 unsigned int num_Words;
1048 struct GNUNET_FS_Uri *uri;
1052 if (keywords == NULL)
1054 *emsg = GNUNET_strdup (_("No keywords specified!\n"));
1058 searchString = GNUNET_strdup (keywords);
1063 while ('\0' != *pos)
1065 if ((saw_quote == 0) && (isspace ((unsigned char) *pos)))
1069 else if (0 == inWord)
1075 saw_quote = (saw_quote + 1) % 2;
1080 GNUNET_free (searchString);
1081 *emsg = GNUNET_strdup (_("No keywords specified!\n"));
1086 GNUNET_free (searchString);
1087 *emsg = GNUNET_strdup (_("Number of double-quotes not balanced!\n"));
1090 keywordarr = GNUNET_new_array (num_Words,
1095 while ('\0' != *pos)
1097 if ((saw_quote == 0) && (isspace ((unsigned char) *pos)))
1102 else if (0 == inWord)
1104 keywordarr[num_Words] = pos;
1109 saw_quote = (saw_quote + 1) % 2;
1113 GNUNET_FS_uri_ksk_create_from_args (num_Words,
1114 (const char **) keywordarr);
1115 GNUNET_free (keywordarr);
1116 GNUNET_free (searchString);
1122 * Create an FS URI from a user-supplied command line of keywords.
1123 * Arguments should start with "+" to indicate mandatory
1126 * @param argc number of keywords
1127 * @param argv keywords (double quotes are not required for
1128 * keywords containing spaces; however, double
1129 * quotes are required for keywords starting with
1130 * "+"); there is no mechanism for having double
1131 * quotes in the actual keywords (if the user
1132 * did specifically specify double quotes, the
1133 * caller should convert each double quote
1134 * into two single quotes).
1135 * @return an FS URI for the given keywords, NULL
1136 * if keywords is not legal (i.e. empty).
1138 struct GNUNET_FS_Uri *
1139 GNUNET_FS_uri_ksk_create_from_args (unsigned int argc,
1143 struct GNUNET_FS_Uri *uri;
1144 const char *keyword;
1152 /* allow URI to be given as one and only keyword and
1153 * handle accordingly */
1155 if ((argc == 1) && (strlen (argv[0]) > strlen (GNUNET_FS_URI_PREFIX)) &&
1157 strncmp (argv[0], GNUNET_FS_URI_PREFIX, strlen (GNUNET_FS_URI_PREFIX)))
1158 && (NULL != (uri = GNUNET_FS_uri_parse (argv[0], &emsg))))
1160 GNUNET_free_non_null (emsg);
1161 uri = GNUNET_new (struct GNUNET_FS_Uri);
1162 uri->type = GNUNET_FS_URI_KSK;
1163 uri->data.ksk.keywordCount = argc;
1164 uri->data.ksk.keywords = GNUNET_new_array (argc,
1166 for (i = 0; i < argc; i++)
1169 if (keyword[0] == '+')
1170 val = GNUNET_strdup (keyword);
1172 GNUNET_asprintf (&val, " %s", keyword);
1183 uri->data.ksk.keywords[i] = val;
1190 * Test if two URIs are equal.
1192 * @param u1 one of the URIs
1193 * @param u2 the other URI
1194 * @return #GNUNET_YES if the URIs are equal
1197 GNUNET_FS_uri_test_equal (const struct GNUNET_FS_Uri *u1,
1198 const struct GNUNET_FS_Uri *u2)
1204 GNUNET_assert (u1 != NULL);
1205 GNUNET_assert (u2 != NULL);
1206 if (u1->type != u2->type)
1210 case GNUNET_FS_URI_CHK:
1212 memcmp (&u1->data.chk, &u2->data.chk, sizeof (struct FileIdentifier)))
1215 case GNUNET_FS_URI_SKS:
1217 memcmp (&u1->data.sks.ns, &u2->data.sks.ns,
1218 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey))) &&
1219 (0 == strcmp (u1->data.sks.identifier, u2->data.sks.identifier)))
1223 case GNUNET_FS_URI_KSK:
1224 if (u1->data.ksk.keywordCount != u2->data.ksk.keywordCount)
1226 for (i = 0; i < u1->data.ksk.keywordCount; i++)
1229 for (j = 0; j < u2->data.ksk.keywordCount; j++)
1231 if (0 == strcmp (u1->data.ksk.keywords[i], u2->data.ksk.keywords[j]))
1237 if (ret == GNUNET_NO)
1241 case GNUNET_FS_URI_LOC:
1243 (&u1->data.loc, &u2->data.loc,
1244 sizeof (struct FileIdentifier) +
1245 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey) +
1246 sizeof (struct GNUNET_TIME_Absolute) + sizeof (unsigned short) +
1247 sizeof (unsigned short)) != 0)
1257 * Is this a namespace URI?
1259 * @param uri the uri to check
1260 * @return #GNUNET_YES if this is an SKS uri
1263 GNUNET_FS_uri_test_sks (const struct GNUNET_FS_Uri *uri)
1265 return uri->type == GNUNET_FS_URI_SKS;
1270 * Get the ID of a namespace from the given
1273 * @param uri the uri to get the namespace ID from
1274 * @param pseudonym where to store the ID of the namespace
1275 * @return #GNUNET_OK on success
1278 GNUNET_FS_uri_sks_get_namespace (const struct GNUNET_FS_Uri *uri,
1279 struct GNUNET_CRYPTO_EcdsaPublicKey *pseudonym)
1281 if (!GNUNET_FS_uri_test_sks (uri))
1284 return GNUNET_SYSERR;
1286 *pseudonym = uri->data.sks.ns;
1292 * Get the content identifier of an SKS URI.
1294 * @param uri the sks uri
1295 * @return NULL on error (not a valid SKS URI)
1298 GNUNET_FS_uri_sks_get_content_id (const struct GNUNET_FS_Uri *uri)
1300 if (!GNUNET_FS_uri_test_sks (uri))
1305 return GNUNET_strdup (uri->data.sks.identifier);
1310 * Is this a keyword URI?
1312 * @param uri the uri
1313 * @return #GNUNET_YES if this is a KSK uri
1316 GNUNET_FS_uri_test_ksk (const struct GNUNET_FS_Uri *uri)
1321 if (uri->type == GNUNET_FS_URI_KSK)
1323 for (i=0;i < uri->data.ksk.keywordCount; i++)
1324 GNUNET_assert (uri->data.ksk.keywords[i] != NULL);
1327 return uri->type == GNUNET_FS_URI_KSK;
1332 * Is this a file (or directory) URI?
1334 * @param uri the uri to check
1335 * @return #GNUNET_YES if this is a CHK uri
1338 GNUNET_FS_uri_test_chk (const struct GNUNET_FS_Uri *uri)
1340 return uri->type == GNUNET_FS_URI_CHK;
1345 * What is the size of the file that this URI
1348 * @param uri the CHK URI to inspect
1349 * @return size of the file as specified in the CHK URI
1352 GNUNET_FS_uri_chk_get_file_size (const struct GNUNET_FS_Uri * uri)
1356 case GNUNET_FS_URI_CHK:
1357 return GNUNET_ntohll (uri->data.chk.file_length);
1358 case GNUNET_FS_URI_LOC:
1359 return GNUNET_ntohll (uri->data.loc.fi.file_length);
1363 return 0; /* unreachable */
1368 * Is this a location URI?
1370 * @param uri the uri to check
1371 * @return #GNUNET_YES if this is a LOC uri
1374 GNUNET_FS_uri_test_loc (const struct GNUNET_FS_Uri *uri)
1376 return uri->type == GNUNET_FS_URI_LOC;
1381 * Add a keyword as non-mandatory (with ' '-prefix) to the
1382 * given keyword list at offset 'index'. The array is
1383 * guaranteed to be long enough.
1385 * @param s keyword to add
1386 * @param array array to add the keyword to
1387 * @param index offset where to add the keyword
1390 insert_non_mandatory_keyword (const char *s,
1396 GNUNET_asprintf (&nkword,
1397 " %s", /* space to mark as 'non mandatory' */
1399 array[index] = nkword;
1404 * Test if the given keyword @a s is already present in the
1405 * given array, ignoring the '+'-mandatory prefix in the array.
1407 * @param s keyword to test
1408 * @param array keywords to test against, with ' ' or '+' prefix to ignore
1409 * @param array_length length of the @a array
1410 * @return #GNUNET_YES if the keyword exists, #GNUNET_NO if not
1413 find_duplicate (const char *s,
1419 for (j = array_length - 1; j >= 0; j--)
1420 if (0 == strcmp (&array[j][1], s))
1430 normalize_metadata (enum EXTRACTOR_MetaFormat format,
1434 uint8_t *free_str = NULL;
1435 uint8_t *str_to_normalize = (uint8_t *) data;
1436 uint8_t *normalized;
1438 if (str_to_normalize == NULL)
1440 /* Don't trust libextractor */
1441 if (format == EXTRACTOR_METAFORMAT_UTF8)
1443 free_str = (uint8_t *) u8_check ((const uint8_t *) data, data_len);
1444 if (free_str == NULL)
1447 format = EXTRACTOR_METAFORMAT_C_STRING;
1449 if (format == EXTRACTOR_METAFORMAT_C_STRING)
1451 free_str = u8_strconv_from_encoding (data, locale_charset (), iconveh_escape_sequence);
1452 if (free_str == NULL)
1456 normalized = u8_tolower (str_to_normalize, strlen ((char *) str_to_normalize), NULL, UNINORM_NFD, NULL, &r_len);
1457 /* free_str is allocated by libunistring internally, use free() */
1458 if (free_str != NULL)
1460 if (normalized != NULL)
1462 /* u8_tolower allocates a non-NULL-terminated string! */
1463 free_str = GNUNET_malloc (r_len + 1);
1464 GNUNET_memcpy (free_str, normalized, r_len);
1465 free_str[r_len] = '\0';
1467 normalized = free_str;
1469 return (char *) normalized;
1474 * Counts the number of UTF-8 characters (not bytes) in the string,
1475 * returns that count.
1478 u8_strcount (const uint8_t *s)
1482 GNUNET_assert (s != NULL);
1485 for (count = 0; s != NULL; count++)
1486 s = u8_next (&c, s);
1492 * Break the filename up by matching [], () and {} pairs to make
1493 * keywords. In case of nesting parentheses only the inner pair counts.
1494 * You can't escape parentheses to scan something like "[blah\{foo]" to
1495 * make a "blah{foo" keyword, this function is only a heuristic!
1497 * @param s string to break down.
1498 * @param array array to fill with enclosed tokens. If NULL, then tokens
1500 * @param index index at which to start filling the array (entries prior
1501 * to it are used to check for duplicates). ignored if @a array == NULL.
1502 * @return number of tokens counted (including duplicates), or number of
1503 * tokens extracted (excluding duplicates). 0 if there are no
1504 * matching parens in the string (when counting), or when all tokens
1505 * were duplicates (when extracting).
1508 get_keywords_from_parens (const char *s,
1520 ss = GNUNET_strdup (s);
1521 open_paren = ss - 1;
1522 while (NULL != (open_paren = strpbrk (open_paren + 1, "[{(")))
1526 close_paren = strpbrk (open_paren + 1, "]})");
1527 if (NULL == close_paren)
1529 switch (open_paren[0])
1532 if (']' == close_paren[0])
1536 if ('}' == close_paren[0])
1540 if (')' == close_paren[0])
1546 if (match && (close_paren - open_paren > 1))
1548 tmp = close_paren[0];
1549 close_paren[0] = '\0';
1550 /* Keywords must be at least 3 characters long */
1551 if (u8_strcount ((const uint8_t *) &open_paren[1]) <= 2)
1553 close_paren[0] = tmp;
1559 if (GNUNET_NO == find_duplicate ((const char *) &open_paren[1],
1560 (const char **) array, index + count))
1562 insert_non_mandatory_keyword ((const char *) &open_paren[1], array,
1566 normalized = normalize_metadata (EXTRACTOR_METAFORMAT_UTF8,
1567 &open_paren[1], close_paren - &open_paren[1]);
1568 if (normalized != NULL)
1570 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1571 (const char **) array, index + count))
1573 insert_non_mandatory_keyword ((const char *) normalized, array,
1577 GNUNET_free (normalized);
1582 close_paren[0] = tmp;
1591 * Where to break up keywords
1593 #define TOKENS "_. /-!?#&+@\"\'\\;:,()[]{}$<>|"
1596 * Break the filename up by TOKENS to make
1599 * @param s string to break down.
1600 * @param array array to fill with tokens. If NULL, then tokens are only
1602 * @param index index at which to start filling the array (entries prior
1603 * to it are used to check for duplicates). ignored if @a array == NULL.
1604 * @return number of tokens (>1) counted (including duplicates), or number of
1605 * tokens extracted (excluding duplicates). 0 if there are no
1606 * separators in the string (when counting), or when all tokens were
1607 * duplicates (when extracting).
1610 get_keywords_from_tokens (const char *s,
1618 ss = GNUNET_strdup (s);
1619 for (p = strtok (ss, TOKENS); p != NULL; p = strtok (NULL, TOKENS))
1621 /* Keywords must be at least 3 characters long */
1622 if (u8_strcount ((const uint8_t *) p) <= 2)
1627 if (GNUNET_NO == find_duplicate (p, (const char **) array, index + seps))
1629 insert_non_mandatory_keyword (p, array,
1633 normalized = normalize_metadata (EXTRACTOR_METAFORMAT_UTF8,
1635 if (normalized != NULL)
1637 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1638 (const char **) array, index + seps))
1640 insert_non_mandatory_keyword ((const char *) normalized, array,
1644 GNUNET_free (normalized);
1657 * Function called on each value in the meta data.
1658 * Adds it to the URI.
1660 * @param cls URI to update
1661 * @param plugin_name name of the plugin that produced this value;
1662 * special values can be used (i.e. '<zlib>' for zlib being
1663 * used in the main libextractor library and yielding
1665 * @param type libextractor-type describing the meta data
1666 * @param format basic format information about data
1667 * @param data_mime_type mime-type of data (not of the original file);
1668 * can be NULL (if mime-type is not known)
1669 * @param data actual meta-data found
1670 * @param data_len number of bytes in @a data
1671 * @return 0 (always)
1674 gather_uri_data (void *cls, const char *plugin_name,
1675 enum EXTRACTOR_MetaType type,
1676 enum EXTRACTOR_MetaFormat format,
1677 const char *data_mime_type,
1681 struct GNUNET_FS_Uri *uri = cls;
1682 char *normalized_data;
1685 if ((format != EXTRACTOR_METAFORMAT_UTF8) &&
1686 (format != EXTRACTOR_METAFORMAT_C_STRING))
1688 /* Keywords must be at least 3 characters long
1689 * If given non-utf8 string it will, most likely, find it to be invalid,
1690 * and will return the length of its valid part, skipping the keyword.
1691 * If it does - fix the extractor, not this check!
1693 if (u8_strcount ((const uint8_t *) data) <= 2)
1695 if ( (EXTRACTOR_METATYPE_MIMETYPE == type) &&
1696 (NULL != (sep = memchr (data, '/', data_len))) &&
1701 GNUNET_asprintf (&xtra,
1705 if (! find_duplicate (xtra,
1706 (const char **) uri->data.ksk.keywords,
1707 uri->data.ksk.keywordCount))
1709 insert_non_mandatory_keyword (xtra,
1710 uri->data.ksk.keywords,
1711 uri->data.ksk.keywordCount);
1712 uri->data.ksk.keywordCount++;
1717 normalized_data = normalize_metadata (format, data, data_len);
1718 if (! find_duplicate (data,
1719 (const char **) uri->data.ksk.keywords,
1720 uri->data.ksk.keywordCount))
1722 insert_non_mandatory_keyword (data,
1723 uri->data.ksk.keywords, uri->data.ksk.keywordCount);
1724 uri->data.ksk.keywordCount++;
1726 if (NULL != normalized_data)
1728 if (! find_duplicate (normalized_data,
1729 (const char **) uri->data.ksk.keywords,
1730 uri->data.ksk.keywordCount))
1732 insert_non_mandatory_keyword (normalized_data,
1733 uri->data.ksk.keywords, uri->data.ksk.keywordCount);
1734 uri->data.ksk.keywordCount++;
1736 GNUNET_free (normalized_data);
1743 * Construct a keyword-URI from meta-data (take all entries
1744 * in the meta-data and construct one large keyword URI
1745 * that lists all keywords that can be found in the meta-data).
1747 * @param md metadata to use
1748 * @return NULL on error, otherwise a KSK URI
1750 struct GNUNET_FS_Uri *
1751 GNUNET_FS_uri_ksk_create_from_meta_data (const struct GNUNET_CONTAINER_MetaData *md)
1753 struct GNUNET_FS_Uri *ret;
1755 char *full_name = NULL;
1758 int tok_keywords = 0;
1759 int paren_keywords = 0;
1763 ret = GNUNET_new (struct GNUNET_FS_Uri);
1764 ret->type = GNUNET_FS_URI_KSK;
1765 ent = GNUNET_CONTAINER_meta_data_iterate (md, NULL, NULL);
1768 full_name = GNUNET_CONTAINER_meta_data_get_first_by_types (md,
1769 EXTRACTOR_METATYPE_GNUNET_ORIGINAL_FILENAME, -1);
1770 if (NULL != full_name)
1772 filename = full_name;
1773 while (NULL != (ss = strstr (filename, DIR_SEPARATOR_STR)))
1775 tok_keywords = get_keywords_from_tokens (filename, NULL, 0);
1776 paren_keywords = get_keywords_from_parens (filename, NULL, 0);
1778 /* x3 because there might be a normalized variant of every keyword,
1779 plus theoretically one more for mime... */
1780 ret->data.ksk.keywords
1781 = GNUNET_new_array ((ent + tok_keywords + paren_keywords) * 3,
1783 GNUNET_CONTAINER_meta_data_iterate (md, &gather_uri_data, ret);
1785 if (tok_keywords > 0)
1786 ret->data.ksk.keywordCount += get_keywords_from_tokens (filename,
1787 ret->data.ksk.keywords,
1788 ret->data.ksk.keywordCount);
1789 if (paren_keywords > 0)
1790 ret->data.ksk.keywordCount += get_keywords_from_parens (filename,
1791 ret->data.ksk.keywords,
1792 ret->data.ksk.keywordCount);
1794 GNUNET_free_non_null (full_name);
1800 * In URI-encoding, does the given character
1801 * need to be encoded using %-encoding?
1804 needs_percent (char c)
1807 ((isalnum ((unsigned char) c)) || (c == '-') || (c == '_') ||
1808 (c == '.') || (c == '~')));
1813 * Convert a KSK URI to a string.
1815 * @param uri the URI to convert
1816 * @return NULL on error (i.e. keywordCount == 0)
1819 uri_ksk_to_string (const struct GNUNET_FS_Uri *uri)
1822 unsigned int keywordCount;
1829 const char *keyword;
1831 if (uri->type != GNUNET_FS_URI_KSK)
1833 keywords = uri->data.ksk.keywords;
1834 keywordCount = uri->data.ksk.keywordCount;
1835 n = keywordCount + strlen (GNUNET_FS_URI_PREFIX) +
1836 strlen (GNUNET_FS_URI_KSK_INFIX) + 1;
1837 for (i = 0; i < keywordCount; i++)
1839 keyword = keywords[i];
1840 slen = strlen (keyword);
1842 for (j = 0; j < slen; j++)
1844 if ((j == 0) && (keyword[j] == ' '))
1847 continue; /* skip leading space */
1849 if (needs_percent (keyword[j]))
1850 n += 2; /* will use %-encoding */
1853 ret = GNUNET_malloc (n);
1854 strcpy (ret, GNUNET_FS_URI_PREFIX);
1855 strcat (ret, GNUNET_FS_URI_KSK_INFIX);
1856 wpos = strlen (ret);
1857 for (i = 0; i < keywordCount; i++)
1859 keyword = keywords[i];
1860 slen = strlen (keyword);
1861 for (j = 0; j < slen; j++)
1863 if ((j == 0) && (keyword[j] == ' '))
1864 continue; /* skip leading space */
1865 if (needs_percent (keyword[j]))
1867 sprintf (&ret[wpos], "%%%02X", (unsigned char) keyword[j]);
1872 ret[wpos++] = keyword[j];
1875 if (i != keywordCount - 1)
1883 * Convert SKS URI to a string.
1885 * @param uri sks uri to convert
1886 * @return NULL on error
1889 uri_sks_to_string (const struct GNUNET_FS_Uri *uri)
1894 if (GNUNET_FS_URI_SKS != uri->type)
1896 ret = GNUNET_STRINGS_data_to_string (&uri->data.sks.ns,
1897 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
1900 GNUNET_assert (NULL != ret);
1902 GNUNET_asprintf (&ret, "%s%s%s/%s", GNUNET_FS_URI_PREFIX,
1903 GNUNET_FS_URI_SKS_INFIX, buf,
1904 uri->data.sks.identifier);
1910 * Convert a CHK URI to a string.
1912 * @param uri chk uri to convert
1913 * @return NULL on error
1916 uri_chk_to_string (const struct GNUNET_FS_Uri *uri)
1918 const struct FileIdentifier *fi;
1920 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1921 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1923 if (uri->type != GNUNET_FS_URI_CHK)
1925 fi = &uri->data.chk;
1926 GNUNET_CRYPTO_hash_to_enc (&fi->chk.key, &keyhash);
1927 GNUNET_CRYPTO_hash_to_enc (&fi->chk.query, &queryhash);
1929 GNUNET_asprintf (&ret, "%s%s%s.%s.%llu", GNUNET_FS_URI_PREFIX,
1930 GNUNET_FS_URI_CHK_INFIX, (const char *) &keyhash,
1931 (const char *) &queryhash, GNUNET_ntohll (fi->file_length));
1937 * Convert a LOC URI to a string.
1939 * @param uri loc uri to convert
1940 * @return NULL on error
1943 uri_loc_to_string (const struct GNUNET_FS_Uri *uri)
1946 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1947 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1949 char peer_sig[SIGNATURE_ASCII_LENGTH + 1];
1951 GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.key, &keyhash);
1952 GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.query, &queryhash);
1954 GNUNET_CRYPTO_eddsa_public_key_to_string (&uri->data.loc.peer.public_key);
1955 GNUNET_assert (NULL !=
1956 GNUNET_STRINGS_data_to_string (&uri->data.loc.contentSignature,
1957 sizeof (struct GNUNET_CRYPTO_EddsaSignature),
1959 sizeof (peer_sig)));
1960 GNUNET_asprintf (&ret,
1961 "%s%s%s.%s.%llu.%s.%s.%llu", GNUNET_FS_URI_PREFIX,
1962 GNUNET_FS_URI_LOC_INFIX, (const char *) &keyhash,
1963 (const char *) &queryhash,
1964 (unsigned long long) GNUNET_ntohll (uri->data.loc.
1968 (unsigned long long) uri->data.loc.expirationTime.abs_value_us / 1000000LL);
1969 GNUNET_free (peer_id);
1975 * Convert a URI to a UTF-8 String.
1977 * @param uri uri to convert to a string
1978 * @return the UTF-8 string
1981 GNUNET_FS_uri_to_string (const struct GNUNET_FS_Uri *uri)
1990 case GNUNET_FS_URI_KSK:
1991 return uri_ksk_to_string (uri);
1992 case GNUNET_FS_URI_SKS:
1993 return uri_sks_to_string (uri);
1994 case GNUNET_FS_URI_CHK:
1995 return uri_chk_to_string (uri);
1996 case GNUNET_FS_URI_LOC:
1997 return uri_loc_to_string (uri);
2004 /* end of fs_uri.c */