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netsurf/utils/nsurl/parse.c
Vincent Sanders 9100fcb409 improve nsurl query handling. 
Alter the handling of query values within nsurl to be like fragments.

This ensures callers never have to care about the query punctuation,
e.g. the question mark

This also means the strings generated will no longer have trailing
question marks which now conforms to behaviour in whatwg url spec
on url serializing in section 4.5
2018-09-26 17:21:33 +01:00

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/*
* Copyright 2011 Michael Drake <tlsa@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file
* NetSurf URL handling implementation.
*
* This is the common implementation of all URL handling within the
* browser. This implementation is based upon RFC3986 although this has
* been superceeded by https://url.spec.whatwg.org/ which is based on
* actual contemporary implementations.
*
* Care must be taken with character encodings within this module as
* the specifications work with specific ascii ranges and must not be
* affected by locale. Hence the c library character type functions
* are not used.
*/
#include <assert.h>
#include <libwapcaplet/libwapcaplet.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "netsurf/inttypes.h"
#include "utils/ascii.h"
#include "utils/corestrings.h"
#include "utils/errors.h"
#include "utils/idna.h"
#include "utils/log.h"
#include "utils/nsurl.h"
#include "utils/nsurl/private.h"
#include "utils/utils.h"
/** Marker set, indicating positions of sections within a URL string */
struct url_markers {
size_t start; /** start of URL */
size_t scheme_end;
size_t authority;
size_t colon_first;
size_t at;
size_t colon_last;
size_t path;
size_t query;
size_t fragment;
size_t end; /** end of URL */
enum nsurl_scheme_type scheme_type;
};
/** Sections of a URL */
enum url_sections {
URL_SCHEME,
URL_CREDENTIALS,
URL_HOST,
URL_PATH,
URL_QUERY,
URL_FRAGMENT
};
/**
* Return a hex digit for the given numerical value.
*
* \param digit the value to get the hex digit for.
* \return character in range 0-9A-F
*/
inline static char digit2uppercase_hex(unsigned char digit) {
assert(digit < 16);
return "0123456789ABCDEF"[digit];
}
/**
* determine if a character is unreserved
*
* \param c character to classify.
* \return true if the character is unreserved else false.
*/
static bool nsurl__is_unreserved(unsigned char c)
{
/* From RFC3986 section 2.3 (unreserved characters)
*
* unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
*
*/
static const bool unreserved[256] = {
false, false, false, false, false, false, false, false, /* 00 */
false, false, false, false, false, false, false, false, /* 08 */
false, false, false, false, false, false, false, false, /* 10 */
false, false, false, false, false, false, false, false, /* 18 */
false, false, false, false, false, false, false, false, /* 20 */
false, false, false, false, false, true, true, false, /* 28 */
true, true, true, true, true, true, true, true, /* 30 */
true, true, false, false, false, false, false, false, /* 38 */
false, true, true, true, true, true, true, true, /* 40 */
true, true, true, true, true, true, true, true, /* 48 */
true, true, true, true, true, true, true, true, /* 50 */
true, true, true, false, false, false, false, true, /* 58 */
false, true, true, true, true, true, true, true, /* 60 */
true, true, true, true, true, true, true, true, /* 68 */
true, true, true, true, true, true, true, true, /* 70 */
true, true, true, false, false, false, true, false, /* 78 */
false, false, false, false, false, false, false, false, /* 80 */
false, false, false, false, false, false, false, false, /* 88 */
false, false, false, false, false, false, false, false, /* 90 */
false, false, false, false, false, false, false, false, /* 98 */
false, false, false, false, false, false, false, false, /* A0 */
false, false, false, false, false, false, false, false, /* A8 */
false, false, false, false, false, false, false, false, /* B0 */
false, false, false, false, false, false, false, false, /* B8 */
false, false, false, false, false, false, false, false, /* C0 */
false, false, false, false, false, false, false, false, /* C8 */
false, false, false, false, false, false, false, false, /* D0 */
false, false, false, false, false, false, false, false, /* D8 */
false, false, false, false, false, false, false, false, /* E0 */
false, false, false, false, false, false, false, false, /* E8 */
false, false, false, false, false, false, false, false, /* F0 */
false, false, false, false, false, false, false, false /* F8 */
};
return unreserved[c];
}
/**
* determine if a character should be percent escaped.
*
* The ASCII codes which should not be percent escaped
*
* \param c character to classify.
* \return true if the character should not be escaped else false.
*/
static bool nsurl__is_no_escape(unsigned char c)
{
static const bool no_escape[256] = {
false, false, false, false, false, false, false, false, /* 00 */
false, false, false, false, false, false, false, false, /* 08 */
false, false, false, false, false, false, false, false, /* 10 */
false, false, false, false, false, false, false, false, /* 18 */
false, true, false, true, true, false, true, true, /* 20 */
true, true, true, true, true, true, true, true, /* 28 */
true, true, true, true, true, true, true, true, /* 30 */
true, true, true, true, false, true, false, true, /* 38 */
true, true, true, true, true, true, true, true, /* 40 */
true, true, true, true, true, true, true, true, /* 48 */
true, true, true, true, true, true, true, true, /* 50 */
true, true, true, true, false, true, false, true, /* 58 */
false, true, true, true, true, true, true, true, /* 60 */
true, true, true, true, true, true, true, true, /* 68 */
true, true, true, true, true, true, true, true, /* 70 */
true, true, true, false, true, false, true, false, /* 78 */
false, false, false, false, false, false, false, false, /* 80 */
false, false, false, false, false, false, false, false, /* 88 */
false, false, false, false, false, false, false, false, /* 90 */
false, false, false, false, false, false, false, false, /* 98 */
false, false, false, false, false, false, false, false, /* A0 */
false, false, false, false, false, false, false, false, /* A8 */
false, false, false, false, false, false, false, false, /* B0 */
false, false, false, false, false, false, false, false, /* B8 */
false, false, false, false, false, false, false, false, /* C0 */
false, false, false, false, false, false, false, false, /* C8 */
false, false, false, false, false, false, false, false, /* D0 */
false, false, false, false, false, false, false, false, /* D8 */
false, false, false, false, false, false, false, false, /* E0 */
false, false, false, false, false, false, false, false, /* E8 */
false, false, false, false, false, false, false, false, /* F0 */
false, false, false, false, false, false, false, false, /* F8 */
};
return no_escape[c];
}
/**
* Obtains a set of markers delimiting sections in a URL string
*
* \param url_s URL string
* \param markers Updated to mark sections in the URL string
* \param joining True iff URL string is a relative URL for joining
*/
static void nsurl__get_string_markers(const char * const url_s,
struct url_markers *markers, bool joining)
{
const char *pos = url_s; /** current position in url_s */
bool is_http = false;
bool trailing_whitespace = false;
/* Initialise marker set */
struct url_markers marker = { 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, NSURL_SCHEME_OTHER };
/* Skip any leading whitespace in url_s */
while (ascii_is_space(*pos))
pos++;
/* Record start point */
marker.start = pos - url_s;
marker.scheme_end = marker.authority = marker.colon_first = marker.at =
marker.colon_last = marker.path = marker.start;
if (*pos == '\0') {
/* Nothing but whitespace, early exit */
marker.query = marker.fragment = marker.end = marker.path;
*markers = marker;
return;
}
/* Get scheme */
if (ascii_is_alpha(*pos)) {
pos++;
while (*pos != ':' && *pos != '\0') {
if (!ascii_is_alphanumerical(*pos) && (*pos != '+') &&
(*pos != '-') && (*pos != '.')) {
/* This character is not valid in the
* scheme */
break;
}
pos++;
}
if (*pos == ':') {
/* This delimits the end of the scheme */
size_t off;
marker.scheme_end = pos - url_s;
off = marker.scheme_end - marker.start;
/* Detect http(s) and mailto for scheme specifc
* normalisation */
if (off == SLEN("http") &&
(((*(pos - off + 0) == 'h') ||
(*(pos - off + 0) == 'H')) &&
((*(pos - off + 1) == 't') ||
(*(pos - off + 1) == 'T')) &&
((*(pos - off + 2) == 't') ||
(*(pos - off + 2) == 'T')) &&
((*(pos - off + 3) == 'p') ||
(*(pos - off + 3) == 'P')))) {
marker.scheme_type = NSURL_SCHEME_HTTP;
is_http = true;
} else if (off == SLEN("https") &&
(((*(pos - off + 0) == 'h') ||
(*(pos - off + 0) == 'H')) &&
((*(pos - off + 1) == 't') ||
(*(pos - off + 1) == 'T')) &&
((*(pos - off + 2) == 't') ||
(*(pos - off + 2) == 'T')) &&
((*(pos - off + 3) == 'p') ||
(*(pos - off + 3) == 'P')) &&
((*(pos - off + 4) == 's') ||
(*(pos - off + 4) == 'S')))) {
marker.scheme_type = NSURL_SCHEME_HTTPS;
is_http = true;
} else if (off == SLEN("file") &&
(((*(pos - off + 0) == 'f') ||
(*(pos - off + 0) == 'F')) &&
((*(pos - off + 1) == 'i') ||
(*(pos - off + 1) == 'I')) &&
((*(pos - off + 2) == 'l') ||
(*(pos - off + 2) == 'L')) &&
((*(pos - off + 3) == 'e') ||
(*(pos - off + 3) == 'E')))) {
marker.scheme_type = NSURL_SCHEME_FILE;
} else if (off == SLEN("ftp") &&
(((*(pos - off + 0) == 'f') ||
(*(pos - off + 0) == 'F')) &&
((*(pos - off + 1) == 't') ||
(*(pos - off + 1) == 'T')) &&
((*(pos - off + 2) == 'p') ||
(*(pos - off + 2) == 'P')))) {
marker.scheme_type = NSURL_SCHEME_FTP;
} else if (off == SLEN("mailto") &&
(((*(pos - off + 0) == 'm') ||
(*(pos - off + 0) == 'M')) &&
((*(pos - off + 1) == 'a') ||
(*(pos - off + 1) == 'A')) &&
((*(pos - off + 2) == 'i') ||
(*(pos - off + 2) == 'I')) &&
((*(pos - off + 3) == 'l') ||
(*(pos - off + 3) == 'L')) &&
((*(pos - off + 4) == 't') ||
(*(pos - off + 4) == 'T')) &&
((*(pos - off + 5) == 'o') ||
(*(pos - off + 5) == 'O')))) {
marker.scheme_type = NSURL_SCHEME_MAILTO;
} else if (off == SLEN("data") &&
(((*(pos - off + 0) == 'd') ||
(*(pos - off + 0) == 'D')) &&
((*(pos - off + 1) == 'a') ||
(*(pos - off + 1) == 'A')) &&
((*(pos - off + 2) == 't') ||
(*(pos - off + 2) == 'T')) &&
((*(pos - off + 3) == 'a') ||
(*(pos - off + 3) == 'A')))) {
marker.scheme_type = NSURL_SCHEME_DATA;
}
/* Skip over colon */
pos++;
/* Mark place as start of authority */
marker.authority = marker.colon_first = marker.at =
marker.colon_last = marker.path =
pos - url_s;
} else {
/* Not found a scheme */
if (joining == false) {
/* Assuming no scheme == http */
marker.scheme_type = NSURL_SCHEME_HTTP;
is_http = true;
}
}
}
/* Get authority
*
* Two slashes always indicates the start of an authority.
*
* We are more relaxed in the case of http:
* a. when joining, one or more slashes indicates start of authority
* b. when not joining, we assume authority if no scheme was present
* and in the case of mailto: when we assume there is an authority.
*/
if ((*pos == '/' && *(pos + 1) == '/') ||
(is_http && ((joining && *pos == '/') ||
(joining == false &&
marker.scheme_end != marker.start))) ||
marker.scheme_type == NSURL_SCHEME_MAILTO) {
/* Skip over leading slashes */
if (*pos == '/') {
if (is_http == false) {
if (*pos == '/') pos++;
if (*pos == '/') pos++;
} else {
while (*pos == '/')
pos++;
}
marker.authority = marker.colon_first = marker.at =
marker.colon_last = marker.path =
pos - url_s;
}
/* Need to get (or complete) the authority */
while (*pos != '\0') {
if (*pos == '/' || *pos == '?' || *pos == '#') {
/* End of the authority */
break;
} else if (marker.scheme_type != NSURL_SCHEME_MAILTO &&
*pos == ':' && marker.colon_first ==
marker.authority) {
/* could be username:password or host:port
* separator */
marker.colon_first = pos - url_s;
} else if (marker.scheme_type != NSURL_SCHEME_MAILTO &&
*pos == ':' && marker.colon_first !=
marker.authority) {
/* could be host:port separator */
marker.colon_last = pos - url_s;
} else if (*pos == '@' && marker.at ==
marker.authority) {
/* Credentials @ host separator */
marker.at = pos - url_s;
}
pos++;
}
marker.path = pos - url_s;
} else if ((*pos == '\0' || *pos == '/') &&
joining == false && is_http == true) {
marker.path = pos - url_s;
}
/* Get path
*
* Needs to start with '/' if there's no authority
*/
if (*pos == '/' || ((marker.path == marker.authority) &&
(*pos != '?') && (*pos != '#') && (*pos != '\0'))) {
while (*(++pos) != '\0') {
if (*pos == '?' || *pos == '#') {
/* End of the path */
break;
}
}
}
marker.query = pos - url_s;
/* Get query */
if (*pos == '?') {
while (*(++pos) != '\0') {
if (*pos == '#') {
/* End of the query */
break;
}
}
}
marker.fragment = pos - url_s;
/* Get fragment */
if (*pos == '#') {
while (*(++pos) != '\0')
;
}
/* We got to the end of url_s.
* Need to skip back over trailing whitespace to find end of URL */
pos--;
if (pos >= url_s && ascii_is_space(*pos)) {
trailing_whitespace = true;
while (pos >= url_s && ascii_is_space(*pos))
pos--;
}
marker.end = pos + 1 - url_s;
if (trailing_whitespace == true) {
/* Ensure last url section doesn't pass end */
if (marker.fragment > marker.end)
marker.fragment = marker.end;
if (marker.query > marker.end)
marker.query = marker.end;
if (marker.path > marker.end)
marker.path = marker.end;
if (marker.colon_last > marker.end)
marker.colon_last = marker.end;
if (marker.at > marker.end)
marker.at = marker.end;
if (marker.colon_last > marker.end)
marker.colon_last = marker.end;
if (marker.fragment > marker.end)
marker.fragment = marker.end;
}
NSLOG(netsurf, DEEPDEBUG,
"marker.start: %"PRIsizet, marker.start);
NSLOG(netsurf, DEEPDEBUG,
"marker.scheme_end: %"PRIsizet, marker.scheme_end);
NSLOG(netsurf, DEEPDEBUG,
"marker.authority: %"PRIsizet, marker.authority);
NSLOG(netsurf, DEEPDEBUG,
"marker.colon_first: %"PRIsizet, marker.colon_first);
NSLOG(netsurf, DEEPDEBUG,
"marker.at: %"PRIsizet, marker.at);
NSLOG(netsurf, DEEPDEBUG,
"marker.colon_last: %"PRIsizet, marker.colon_last);
NSLOG(netsurf, DEEPDEBUG,
"marker.path: %"PRIsizet, marker.path);
NSLOG(netsurf, DEEPDEBUG,
"marker.query: %"PRIsizet, marker.query);
NSLOG(netsurf, DEEPDEBUG,
"marker.fragment: %"PRIsizet, marker.fragment);
NSLOG(netsurf, DEEPDEBUG,
"marker.end: %"PRIsizet, marker.end);
/* Got all the URL components pegged out now */
*markers = marker;
}
/**
* Remove dot segments from a path, as per rfc 3986, 5.2.4
*
* \param path path to remove dot segments from ('\0' terminated)
* \param output path with dot segments removed
* \return size of output
*/
static size_t nsurl__remove_dot_segments(char *path, char *output)
{
char *path_pos = path;
char *output_pos = output;
while (*path_pos != '\0') {
NSLOG(netsurf, DEEPDEBUG, " in:%s", path_pos);
NSLOG(netsurf, DEEPDEBUG, "out:%.*s",
(int)(output_pos - output), output);
if (*path_pos == '.') {
if (*(path_pos + 1) == '.' &&
*(path_pos + 2) == '/') {
/* Found prefix of "../" */
path_pos += SLEN("../");
continue;
} else if (*(path_pos + 1) == '/') {
/* Found prefix of "./" */
path_pos += SLEN("./");
continue;
}
} else if (*path_pos == '/' && *(path_pos + 1) == '.') {
if (*(path_pos + 2) == '/') {
/* Found prefix of "/./" */
path_pos += SLEN("/.");
continue;
} else if (*(path_pos + 2) == '\0') {
/* Found "/." at end of path */
*(output_pos++) = '/';
/* End of input path */
break;
} else if (*(path_pos + 2) == '.') {
if (*(path_pos + 3) == '/') {
/* Found prefix of "/../" */
path_pos += SLEN("/..");
if (output_pos > output)
output_pos--;
while (output_pos > output &&
*output_pos != '/')
output_pos--;
continue;
} else if (*(path_pos + 3) == '\0') {
/* Found "/.." at end of path */
while (output_pos > output &&
*(output_pos -1 ) !='/')
output_pos--;
/* End of input path */
break;
}
}
} else if (*path_pos == '.') {
if (*(path_pos + 1) == '\0') {
/* Found "." at end of path */
/* End of input path */
break;
} else if (*(path_pos + 1) == '.' &&
*(path_pos + 2) == '\0') {
/* Found ".." at end of path */
/* End of input path */
break;
}
}
/* Copy first character into output path */
*output_pos++ = *path_pos++;
/* Copy up to but not including next '/' */
while ((*path_pos != '/') && (*path_pos != '\0'))
*output_pos++ = *path_pos++;
}
return output_pos - output;
}
/**
* Get the length of the longest section
*
* \param m markers delimiting url sections in a string
* \return the length of the longest section
*/
static size_t nsurl__get_longest_section(struct url_markers *m)
{
size_t length = m->scheme_end - m->start; /* scheme */
if (length < m->at - m->authority) /* credentials */
length = m->at - m->authority;
if (length < m->path - m->at) /* host */
length = m->path - m->at;
if (length < m->query - m->path) /* path */
length = m->query - m->path;
if (length < m->fragment - m->query) /* query */
length = m->fragment - m->query;
if (length < m->end - m->fragment) /* fragment */
length = m->end - m->fragment;
return length;
}
/**
* Create the components of a NetSurf URL object for a section of a URL string
*
* \param url_s URL string
* \param section Sets which section of URL string is to be normalised
* \param pegs Set of markers delimiting the URL string's sections
* \param pos_norm A buffer large enough for the normalised string (*3 + 1)
* \param url A NetSurf URL object, to which components may be added
* \return NSERROR_OK on success, appropriate error otherwise
*
* The section of url_s is normalised appropriately.
*/
static nserror nsurl__create_from_section(const char * const url_s,
const enum url_sections section,
const struct url_markers *pegs,
char *pos_norm,
struct nsurl_components *url)
{
nserror ret;
int ascii_offset;
int start = 0;
int end = 0;
const char *pos;
const char *pos_url_s;
char *norm_start = pos_norm;
char *host;
size_t copy_len;
size_t length;
size_t host_len;
enum {
NSURL_F_NO_PORT = (1 << 0)
} flags = 0;
switch (section) {
case URL_SCHEME:
start = pegs->start;
end = pegs->scheme_end;
break;
case URL_CREDENTIALS:
start = pegs->authority;
end = pegs->at;
break;
case URL_HOST:
start = (pegs->at == pegs->authority &&
*(url_s + pegs->at) != '@') ?
pegs->at :
pegs->at + 1;
end = pegs->path;
break;
case URL_PATH:
start = pegs->path;
end = pegs->query;
break;
case URL_QUERY:
start = (*(url_s + pegs->query) != '?') ?
pegs->query :
pegs->query + 1;
end = pegs->fragment;
break;
case URL_FRAGMENT:
start = (*(url_s + pegs->fragment) != '#') ?
pegs->fragment :
pegs->fragment + 1;
end = pegs->end;
break;
}
if (end < start)
end = start;
length = end - start;
/* Stage 1: Normalise the required section */
pos = pos_url_s = url_s + start;
copy_len = 0;
for (; pos < url_s + end; pos++) {
if (*pos == '%' && (pos + 2 < url_s + end)) {
/* Might be an escaped character needing unescaped */
/* Find which character which was escaped */
ascii_offset = ascii_hex_to_value_2_chars(*(pos + 1),
*(pos + 2));
if (ascii_offset < 0) {
/* % with invalid hex digits. */
copy_len++;
continue;
}
if ((section != URL_SCHEME && section != URL_HOST) &&
(nsurl__is_unreserved(ascii_offset) == false)) {
/* This character should be escaped after all,
* just let it get copied */
copy_len += 3;
pos += 2;
continue;
}
if (copy_len > 0) {
/* Copy up to here */
memcpy(pos_norm, pos_url_s, copy_len);
pos_norm += copy_len;
copy_len = 0;
}
/* Put the unescaped character in the normalised URL */
*(pos_norm++) = (char)ascii_offset;
pos += 2;
pos_url_s = pos + 1;
length -= 2;
} else if ((section != URL_SCHEME && section != URL_HOST) &&
(nsurl__is_no_escape(*pos) == false)) {
/* This needs to be escaped */
if (copy_len > 0) {
/* Copy up to here */
memcpy(pos_norm, pos_url_s, copy_len);
pos_norm += copy_len;
copy_len = 0;
}
/* escape */
*(pos_norm++) = '%';
*(pos_norm++) = digit2uppercase_hex(
((unsigned char)*pos) >> 4);
*(pos_norm++) = digit2uppercase_hex(
((unsigned char)*pos) & 0xf);
pos_url_s = pos + 1;
length += 2;
} else if ((section == URL_SCHEME || section == URL_HOST) &&
ascii_is_alpha_upper(*pos)) {
/* Lower case this letter */
if (copy_len > 0) {
/* Copy up to here */
memcpy(pos_norm, pos_url_s, copy_len);
pos_norm += copy_len;
copy_len = 0;
}
/* Copy lower cased letter into normalised URL */
*(pos_norm++) = ascii_to_lower(*pos);
pos_url_s = pos + 1;
} else {
/* This character is safe in normalised URL */
copy_len++;
}
}
if (copy_len > 0) {
/* Copy up to here */
memcpy(pos_norm, pos_url_s, copy_len);
pos_norm += copy_len;
}
/* Mark end of section */
(*pos_norm) = '\0';
/* Stage 2: Create the URL components for the required section */
switch (section) {
case URL_SCHEME:
if (length == 0) {
/* No scheme, assuming http */
url->scheme = lwc_string_ref(corestring_lwc_http);
} else {
/* Add scheme to URL */
if (lwc_intern_string(norm_start, length,
&url->scheme) != lwc_error_ok) {
return NSERROR_NOMEM;
}
}
break;
case URL_CREDENTIALS:
url->username = NULL;
url->password = NULL;
/* file: URLs don't have credentials */
if (url->scheme_type == NSURL_SCHEME_FILE) {
break;
}
if (length != 0 && *norm_start != ':') {
char *sec_start = norm_start;
if (pegs->colon_first != pegs->authority &&
pegs->at > pegs->colon_first + 1) {
/* there's a password */
sec_start += pegs->colon_first -
pegs->authority + 1;
if (lwc_intern_string(sec_start,
pegs->at - pegs->colon_first -1,
&url->password) !=
lwc_error_ok) {
return NSERROR_NOMEM;
}
/* update start pos and length for username */
sec_start = norm_start;
length -= pegs->at - pegs->colon_first;
} else if (pegs->colon_first != pegs->authority &&
pegs->at == pegs->colon_first + 1) {
/* strip username colon */
length--;
}
/* Username */
if (lwc_intern_string(sec_start, length,
&url->username) != lwc_error_ok) {
return NSERROR_NOMEM;
}
}
break;
case URL_HOST:
url->host = NULL;
url->port = NULL;
/* file: URLs don't have a host */
if (url->scheme_type == NSURL_SCHEME_FILE) {
break;
}
if (length != 0) {
size_t colon = 0;
char *sec_start = norm_start;
if (pegs->at < pegs->colon_first &&
pegs->colon_last == pegs->authority) {
/* There's one colon and it's after @ marker */
colon = pegs->colon_first;
} else if (pegs->colon_last != pegs->authority) {
/* There's more than one colon */
colon = pegs->colon_last;
} else {
/* There's no colon that could be a port
* separator */
flags |= NSURL_F_NO_PORT;
}
if (!(flags & NSURL_F_NO_PORT)) {
/* Determine whether colon is a port separator
*/
sec_start += colon - pegs->at;
while (++sec_start < norm_start + length) {
if (!ascii_is_digit(*sec_start)) {
/* Character after port isn't a
* digit; not a port separator
*/
flags |= NSURL_F_NO_PORT;
break;
}
}
}
if (!(flags & NSURL_F_NO_PORT)) {
/* There's a port */
size_t skip = (pegs->at == pegs->authority) ?
1 : 0;
sec_start = norm_start + colon - pegs->at +
skip;
if (url->scheme != NULL &&
url->scheme_type ==
NSURL_SCHEME_HTTP &&
length -
(colon - pegs->at + skip) == 2 &&
*sec_start == '8' &&
*(sec_start + 1) == '0') {
/* Scheme is http, and port is default
* (80) */
flags |= NSURL_F_NO_PORT;
}
if (length <= (colon - pegs->at + skip)) {
/* No space for a port after the colon
*/
flags |= NSURL_F_NO_PORT;
}
/* Add non-redundant ports to NetSurf URL */
sec_start = norm_start + colon - pegs->at +
skip;
if (!(flags & NSURL_F_NO_PORT) &&
lwc_intern_string(sec_start,
length -
(colon - pegs->at + skip),
&url->port) != lwc_error_ok) {
return NSERROR_NOMEM;
}
/* update length for host */
skip = (pegs->at == pegs->authority) ? 0 : 1;
length = colon - pegs->at - skip;
}
/* host */
/* Encode host according to IDNA2008 */
ret = idna_encode(norm_start, length, &host, &host_len);
if (ret == NSERROR_OK) {
/* valid idna encoding */
if (lwc_intern_string(host, host_len,
&url->host) != lwc_error_ok) {
return NSERROR_NOMEM;
}
free(host);
} else {
/* fall back to straight interning */
if (lwc_intern_string(norm_start, length,
&url->host) != lwc_error_ok) {
return NSERROR_NOMEM;
}
}
}
break;
case URL_PATH:
if (length != 0) {
if (lwc_intern_string(norm_start, length,
&url->path) != lwc_error_ok) {
return NSERROR_NOMEM;
}
} else if ((url->host != NULL &&
url->scheme_type != NSURL_SCHEME_MAILTO) ||
url->scheme_type == NSURL_SCHEME_FILE) {
/* Set empty path to "/" if:
* - there's a host and its not a mailto: URL
* - its a file: URL
*/
if (lwc_intern_string("/", SLEN("/"),
&url->path) != lwc_error_ok) {
return NSERROR_NOMEM;
}
} else {
url->path = NULL;
}
break;
case URL_QUERY:
if (length != 0) {
if (lwc_intern_string(norm_start, length,
&url->query) != lwc_error_ok) {
return NSERROR_NOMEM;
}
} else {
url->query = NULL;
}
break;
case URL_FRAGMENT:
if (length != 0) {
if (lwc_intern_string(norm_start, length,
&url->fragment) != lwc_error_ok) {
return NSERROR_NOMEM;
}
} else {
url->fragment = NULL;
}
break;
}
return NSERROR_OK;
}
/**
* Get nsurl string info; total length, component lengths, & components present
*
* \param url NetSurf URL components
* \param parts Which parts of the URL are required in the string
* \param url_l Updated to total string length
* \param lengths Updated with individual component lengths
* \param pflags Updated to contain relevant string flags
*/
static void nsurl__get_string_data(const struct nsurl_components *url,
nsurl_component parts, size_t *url_l,
struct nsurl_component_lengths *lengths,
enum nsurl_string_flags *pflags)
{
enum nsurl_string_flags flags = *pflags;
*url_l = 0;
/* Intersection of required parts and available parts gives
* the output parts */
if (url->scheme && parts & NSURL_SCHEME) {
flags |= NSURL_F_SCHEME;
lengths->scheme = lwc_string_length(url->scheme);
*url_l += lengths->scheme;
}
if (url->username && parts & NSURL_USERNAME) {
flags |= NSURL_F_USERNAME;
lengths->username = lwc_string_length(url->username);
*url_l += lengths->username;
}
if (url->password && parts & NSURL_PASSWORD) {
flags |= NSURL_F_PASSWORD;
lengths->password = lwc_string_length(url->password);
*url_l += SLEN(":") + lengths->password;
}
if (url->host && parts & NSURL_HOST) {
flags |= NSURL_F_HOST;
lengths->host = lwc_string_length(url->host);
*url_l += lengths->host;
}
if (url->port && parts & NSURL_PORT) {
flags |= NSURL_F_PORT;
lengths->port = lwc_string_length(url->port);
*url_l += SLEN(":") + lengths->port;
}
if (url->path && parts & NSURL_PATH) {
flags |= NSURL_F_PATH;
lengths->path = lwc_string_length(url->path);
*url_l += lengths->path;
}
if (url->query && parts & NSURL_QUERY) {
flags |= NSURL_F_QUERY;
lengths->query = lwc_string_length(url->query);
*url_l += lengths->query;
}
if (url->fragment && parts & NSURL_FRAGMENT) {
flags |= NSURL_F_FRAGMENT;
lengths->fragment = lwc_string_length(url->fragment);
*url_l += lengths->fragment;
}
/* Turn on any spanned punctuation */
if ((flags & NSURL_F_SCHEME) && (parts > NSURL_SCHEME)) {
flags |= NSURL_F_SCHEME_PUNCTUATION;
*url_l += SLEN(":");
}
if ((flags & NSURL_F_SCHEME) && (flags > NSURL_F_SCHEME) &&
url->path && lwc_string_data(url->path)[0] == '/') {
flags |= NSURL_F_AUTHORITY_PUNCTUATION;
*url_l += SLEN("//");
}
if ((flags & (NSURL_F_USERNAME | NSURL_F_PASSWORD)) &&
flags & NSURL_F_HOST) {
flags |= NSURL_F_CREDENTIALS_PUNCTUATION;
*url_l += SLEN("@");
}
/* spanned query question mark */
if ((flags & ~(NSURL_F_QUERY | NSURL_F_FRAGMENT)) &&
(flags & NSURL_F_QUERY)) {
flags |= NSURL_F_QUERY_PUNCTUATION;
*url_l += SLEN("?");
}
/* spanned fragment hash mark */
if ((flags & ~NSURL_F_FRAGMENT) && (flags & NSURL_F_FRAGMENT)) {
flags |= NSURL_F_FRAGMENT_PUNCTUATION;
*url_l += SLEN("#");
}
*pflags = flags;
}
/**
* Copy url string into provided buffer
*
* \param url NetSurf URL components
* \param url_s Updated to contain the string
* \param l Individual component lengths
* \param flags String flags
*/
static void nsurl__get_string(const struct nsurl_components *url, char *url_s,
struct nsurl_component_lengths *l,
enum nsurl_string_flags flags)
{
char *pos;
/* Copy the required parts into the url string */
pos = url_s;
if (flags & NSURL_F_SCHEME) {
memcpy(pos, lwc_string_data(url->scheme), l->scheme);
pos += l->scheme;
}
if (flags & NSURL_F_SCHEME_PUNCTUATION) {
*(pos++) = ':';
}
if (flags & NSURL_F_AUTHORITY_PUNCTUATION) {
*(pos++) = '/';
*(pos++) = '/';
}
if (flags & NSURL_F_USERNAME) {
memcpy(pos, lwc_string_data(url->username), l->username);
pos += l->username;
}
if (flags & NSURL_F_PASSWORD) {
*(pos++) = ':';
memcpy(pos, lwc_string_data(url->password), l->password);
pos += l->password;
}
if (flags & NSURL_F_CREDENTIALS_PUNCTUATION) {
*(pos++) = '@';
}
if (flags & NSURL_F_HOST) {
memcpy(pos, lwc_string_data(url->host), l->host);
pos += l->host;
}
if (flags & NSURL_F_PORT) {
*(pos++) = ':';
memcpy(pos, lwc_string_data(url->port), l->port);
pos += l->port;
}
if (flags & NSURL_F_PATH) {
memcpy(pos, lwc_string_data(url->path), l->path);
pos += l->path;
}
if (flags & NSURL_F_QUERY) {
if (flags & NSURL_F_QUERY_PUNCTUATION)
*(pos++) = '?';
memcpy(pos, lwc_string_data(url->query), l->query);
pos += l->query;
}
if (flags & NSURL_F_FRAGMENT) {
if (flags & NSURL_F_FRAGMENT_PUNCTUATION)
*(pos++) = '#';
memcpy(pos, lwc_string_data(url->fragment), l->fragment);
pos += l->fragment;
}
*pos = '\0';
}
/* exported interface, documented in nsurl.h */
nserror nsurl__components_to_string(
const struct nsurl_components *components,
nsurl_component parts, size_t pre_padding,
char **url_s_out, size_t *url_l_out)
{
struct nsurl_component_lengths str_len = { 0, 0, 0, 0, 0, 0, 0, 0 };
enum nsurl_string_flags str_flags = 0;
size_t url_l;
char *url_s;
assert(components != NULL);
/* Get the string length and find which parts of url need copied */
nsurl__get_string_data(components, parts, &url_l,
&str_len, &str_flags);
if (url_l == 0) {
return NSERROR_BAD_URL;
}
/* Allocate memory for url string */
url_s = malloc(pre_padding + url_l + 1); /* adding 1 for '\0' */
if (url_s == NULL) {
return NSERROR_NOMEM;
}
/* Copy the required parts into the url string */
nsurl__get_string(components, url_s + pre_padding, &str_len, str_flags);
*url_s_out = url_s;
*url_l_out = url_l;
return NSERROR_OK;
}
/**
* Calculate hash value
*
* \param url NetSurf URL object to set hash value for
*/
void nsurl__calc_hash(nsurl *url)
{
uint32_t hash = 0;
if (url->components.scheme)
hash ^= lwc_string_hash_value(url->components.scheme);
if (url->components.username)
hash ^= lwc_string_hash_value(url->components.username);
if (url->components.password)
hash ^= lwc_string_hash_value(url->components.password);
if (url->components.host)
hash ^= lwc_string_hash_value(url->components.host);
if (url->components.port)
hash ^= lwc_string_hash_value(url->components.port);
if (url->components.path)
hash ^= lwc_string_hash_value(url->components.path);
if (url->components.query)
hash ^= lwc_string_hash_value(url->components.query);
url->hash = hash;
}
/******************************************************************************
* NetSurf URL Public API *
******************************************************************************/
/* exported interface, documented in nsurl.h */
nserror nsurl_create(const char * const url_s, nsurl **url)
{
struct url_markers m;
struct nsurl_components c;
size_t length;
char *buff;
nserror e = NSERROR_OK;
bool match;
assert(url_s != NULL);
/* Peg out the URL sections */
nsurl__get_string_markers(url_s, &m, false);
/* Get the length of the longest section */
length = nsurl__get_longest_section(&m);
/* Allocate enough memory to url escape the longest section */
buff = malloc(length * 3 + 1);
if (buff == NULL)
return NSERROR_NOMEM;
/* Set scheme type */
c.scheme_type = m.scheme_type;
/* Build NetSurf URL object from sections */
e |= nsurl__create_from_section(url_s, URL_SCHEME, &m, buff, &c);
e |= nsurl__create_from_section(url_s, URL_CREDENTIALS, &m, buff, &c);
e |= nsurl__create_from_section(url_s, URL_HOST, &m, buff, &c);
e |= nsurl__create_from_section(url_s, URL_PATH, &m, buff, &c);
e |= nsurl__create_from_section(url_s, URL_QUERY, &m, buff, &c);
e |= nsurl__create_from_section(url_s, URL_FRAGMENT, &m, buff, &c);
/* Finished with buffer */
free(buff);
if (e != NSERROR_OK) {
nsurl__components_destroy(&c);
return NSERROR_NOMEM;
}
/* Validate URL */
if ((lwc_string_isequal(c.scheme, corestring_lwc_http,
&match) == lwc_error_ok && match == true) ||
(lwc_string_isequal(c.scheme, corestring_lwc_https,
&match) == lwc_error_ok && match == true)) {
/* http, https must have host */
if (c.host == NULL) {
nsurl__components_destroy(&c);
return NSERROR_BAD_URL;
}
}
e = nsurl__components_to_string(&c, NSURL_WITH_FRAGMENT,
sizeof(nsurl), (char **)url, &length);
if (e != NSERROR_OK) {
return e;
}
(*url)->components = c;
(*url)->length = length;
/* Get the nsurl's hash */
nsurl__calc_hash(*url);
/* Give the URL a reference */
(*url)->count = 1;
return NSERROR_OK;
}
/* exported interface, documented in nsurl.h */
nserror nsurl_join(const nsurl *base, const char *rel, nsurl **joined)
{
struct url_markers m;
struct nsurl_components c;
size_t length;
char *buff;
char *buff_pos;
char *buff_start;
nserror error = 0;
enum {
NSURL_F_REL = 0,
NSURL_F_BASE_SCHEME = (1 << 0),
NSURL_F_BASE_AUTHORITY = (1 << 1),
NSURL_F_BASE_PATH = (1 << 2),
NSURL_F_MERGED_PATH = (1 << 3),
NSURL_F_BASE_QUERY = (1 << 4)
} joined_parts;
assert(base != NULL);
assert(rel != NULL);
NSLOG(netsurf, DEEPDEBUG, "base: \"%s\", rel: \"%s\"",
nsurl_access(base), rel);
/* Peg out the URL sections */
nsurl__get_string_markers(rel, &m, true);
/* Get the length of the longest section */
length = nsurl__get_longest_section(&m);
/* Initially assume that the joined URL can be formed entierly from
* the relative URL.
*/
joined_parts = NSURL_F_REL;
/* Update joined_compnents to indicate any required parts from the
* base URL.
*/
if (m.scheme_end - m.start <= 0) {
/* The relative url has no scheme.
* Use base URL's scheme. */
joined_parts |= NSURL_F_BASE_SCHEME;
if (m.path - m.authority <= 0) {
/* The relative URL has no authority.
* Use base URL's authority. */
joined_parts |= NSURL_F_BASE_AUTHORITY;
if (m.query - m.path <= 0) {
/* The relative URL has no path.
* Use base URL's path. */
joined_parts |= NSURL_F_BASE_PATH;
if (m.fragment - m.query <= 0) {
/* The relative URL has no query.
* Use base URL's query. */
joined_parts |= NSURL_F_BASE_QUERY;
}
} else if (*(rel + m.path) != '/') {
/* Relative URL has relative path */
joined_parts |= NSURL_F_MERGED_PATH;
}
}
}
/* Allocate enough memory to url escape the longest section, plus
* space for path merging (if required).
*/
if (joined_parts & NSURL_F_MERGED_PATH) {
/* Need to merge paths */
length += (base->components.path != NULL) ?
lwc_string_length(base->components.path) : 0;
}
length *= 4;
/* Plus space for removing dots from path */
length += (m.query - m.path) + ((base->components.path != NULL) ?
lwc_string_length(base->components.path) : 0);
buff = malloc(length + 5);
if (buff == NULL) {
return NSERROR_NOMEM;
}
buff_pos = buff;
/* Form joined URL from base or rel components, as appropriate */
if (joined_parts & NSURL_F_BASE_SCHEME) {
c.scheme_type = base->components.scheme_type;
c.scheme = nsurl__component_copy(base->components.scheme);
} else {
c.scheme_type = m.scheme_type;
error = nsurl__create_from_section(rel, URL_SCHEME, &m, buff, &c);
if (error != NSERROR_OK) {
free(buff);
return error;
}
}
if (joined_parts & NSURL_F_BASE_AUTHORITY) {
c.username = nsurl__component_copy(base->components.username);
c.password = nsurl__component_copy(base->components.password);
c.host = nsurl__component_copy(base->components.host);
c.port = nsurl__component_copy(base->components.port);
} else {
error = nsurl__create_from_section(rel, URL_CREDENTIALS, &m,
buff, &c);
if (error == NSERROR_OK) {
error = nsurl__create_from_section(rel, URL_HOST, &m,
buff, &c);
}
if (error != NSERROR_OK) {
free(buff);
return error;
}
}
if (joined_parts & NSURL_F_BASE_PATH) {
c.path = nsurl__component_copy(base->components.path);
} else if (joined_parts & NSURL_F_MERGED_PATH) {
struct url_markers m_path;
size_t new_length;
/* RFC3986 said to append relative path to "/" if the
* base path had no path and an authority.
*
* However, that specification is redundant, and base paths
* are normalised, so file, http, and https URLs will always
* have a non-empty path. (Empty paths become "/".)
*/
{
/* Append relative path to all but last segment of
* base path. */
size_t path_end = lwc_string_length(
base->components.path);
const char *path = lwc_string_data(
base->components.path);
while (*(path + path_end) != '/' &&
path_end != 0) {
path_end--;
}
if (*(path + path_end) == '/')
path_end++;
/* Copy the base part */
memcpy(buff_pos, path, path_end);
buff_pos += path_end;
/* Copy the relative part */
memcpy(buff_pos, rel + m.path, m.query - m.path);
buff_pos += m.query - m.path;
}
/* add termination to string */
*buff_pos++ = '\0';
new_length = nsurl__remove_dot_segments(buff, buff_pos);
m_path.path = 0;
m_path.query = new_length;
buff_start = buff_pos + new_length;
error = nsurl__create_from_section(buff_pos, URL_PATH, &m_path,
buff_start, &c);
if (error != NSERROR_OK) {
free(buff);
return error;
}
} else {
struct url_markers m_path;
size_t new_length;
memcpy(buff_pos, rel + m.path, m.query - m.path);
buff_pos += m.query - m.path;
*(buff_pos++) = '\0';
new_length = nsurl__remove_dot_segments(buff, buff_pos);
m_path.path = 0;
m_path.query = new_length;
buff_start = buff_pos + new_length;
error = nsurl__create_from_section(buff_pos, URL_PATH, &m_path,
buff_start, &c);
if (error != NSERROR_OK) {
free(buff);
return error;
}
}
if (joined_parts & NSURL_F_BASE_QUERY) {
c.query = nsurl__component_copy(base->components.query);
} else {
error = nsurl__create_from_section(rel, URL_QUERY, &m,
buff, &c);
if (error != NSERROR_OK) {
free(buff);
return error;
}
}
error = nsurl__create_from_section(rel, URL_FRAGMENT, &m, buff, &c);
/* Free temporary buffer */
free(buff);
if (error != NSERROR_OK) {
return error;
}
error = nsurl__components_to_string(&c, NSURL_WITH_FRAGMENT,
sizeof(nsurl), (char **)joined, &length);
if (error != NSERROR_OK) {
return error;
}
(*joined)->components = c;
(*joined)->length = length;
/* Get the nsurl's hash */
nsurl__calc_hash(*joined);
/* Give the URL a reference */
(*joined)->count = 1;
return NSERROR_OK;
}
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