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urlapi: add CURLU_GET_EMPTY for empty queries and fragments

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By default the API inhibits empty queries and fragments extracted.
Unless this new flag is set.

This also makes the behavior more consistent: without it set, zero
length queries and fragments are considered not present in the URL. With
the flag set, they are returned as a zero length strings if they were in
fact present in the URL.

This applies when extracting the individual query and fragment
components and for the full URL.

Closes #13396
This commit is contained in:
Daniel Stenberg 2024-04-17 11:39:25 +02:00
parent 5379dbc248
commit 3eac21d86b
No known key found for this signature in database
GPG key ID: 5CC908FDB71E12C2
6 changed files with 77 additions and 10 deletions
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37
lib/urlapi.c
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@ -79,7 +79,9 @@ struct Curl_URL {
char *path;
char *query;
char *fragment;
long portnum; /* the numerical version */
unsigned short portnum; /* the numerical version */
BIT(query_present); /* to support blank */
BIT(fragment_present); /* to support blank */
};
#define DEFAULT_SCHEME "https"
@ -561,7 +563,7 @@ UNITTEST CURLUcode Curl_parse_port(struct Curl_URL *u, struct dynbuf *host,
if(rest[0])
return CURLUE_BAD_PORT_NUMBER;
u->portnum = port;
u->portnum = (unsigned short) port;
/* generate a new port number string to get rid of leading zeroes etc */
free(u->port);
u->port = aprintf("%ld", port);
@ -1245,6 +1247,7 @@ static CURLUcode parseurl(const char *url, CURLU *u, unsigned int flags)
fragment = strchr(path, '#');
if(fragment) {
fraglen = pathlen - (fragment - path);
u->fragment_present = TRUE;
if(fraglen > 1) {
/* skip the leading '#' in the copy but include the terminating null */
if(flags & CURLU_URLENCODE) {
@ -1272,6 +1275,7 @@ static CURLUcode parseurl(const char *url, CURLU *u, unsigned int flags)
size_t qlen = fragment ? (size_t)(fragment - query) :
pathlen - (query - path);
pathlen -= qlen;
u->query_present = TRUE;
if(qlen > 1) {
if(flags & CURLU_URLENCODE) {
struct dynbuf enc;
@ -1407,6 +1411,8 @@ CURLU *curl_url_dup(const CURLU *in)
DUP(u, in, fragment);
DUP(u, in, zoneid);
u->portnum = in->portnum;
u->fragment_present = in->fragment_present;
u->query_present = in->query_present;
}
return u;
fail:
@ -1491,10 +1497,16 @@ CURLUcode curl_url_get(const CURLU *u, CURLUPart what,
ptr = u->query;
ifmissing = CURLUE_NO_QUERY;
plusdecode = urldecode;
if(ptr && !ptr[0] && !(flags & CURLU_GET_EMPTY))
/* there was a blank query and the user do not ask for it */
ptr = NULL;
break;
case CURLUPART_FRAGMENT:
ptr = u->fragment;
ifmissing = CURLUE_NO_FRAGMENT;
if(!ptr && u->fragment_present && flags & CURLU_GET_EMPTY)
/* there was a blank fragment and the user asks for it */
ptr = "";
break;
case CURLUPART_URL: {
char *url;
@ -1502,13 +1514,18 @@ CURLUcode curl_url_get(const CURLU *u, CURLUPart what,
char *options = u->options;
char *port = u->port;
char *allochost = NULL;
bool show_fragment =
u->fragment || (u->fragment_present && flags & CURLU_GET_EMPTY);
bool show_query =
(u->query && u->query[0]) ||
(u->query_present && flags & CURLU_GET_EMPTY);
punycode = (flags & CURLU_PUNYCODE)?1:0;
depunyfy = (flags & CURLU_PUNY2IDN)?1:0;
if(u->scheme && strcasecompare("file", u->scheme)) {
url = aprintf("file://%s%s%s",
u->path,
u->fragment? "#": "",
u->fragment? u->fragment : "");
show_fragment ? "#": "",
u->fragment ? u->fragment : "");
}
else if(!u->host)
return CURLUE_NO_HOST;
@ -1596,9 +1613,9 @@ CURLUcode curl_url_get(const CURLU *u, CURLUPart what,
port ? ":": "",
port ? port : "",
u->path ? u->path : "/",
(u->query && u->query[0]) ? "?": "",
(u->query && u->query[0]) ? u->query : "",
u->fragment? "#": "",
show_query ? "?": "",
u->query ? u->query : "",
show_fragment ? "#": "",
u->fragment? u->fragment : "");
free(allochost);
}
@ -1733,9 +1750,11 @@ CURLUcode curl_url_set(CURLU *u, CURLUPart what,
break;
case CURLUPART_QUERY:
storep = &u->query;
u->query_present = FALSE;
break;
case CURLUPART_FRAGMENT:
storep = &u->fragment;
u->fragment_present = FALSE;
break;
default:
return CURLUE_UNKNOWN_PART;
@ -1819,9 +1838,11 @@ CURLUcode curl_url_set(CURLU *u, CURLUPart what,
appendquery = (flags & CURLU_APPENDQUERY)?1:0;
equalsencode = appendquery;
storep = &u->query;
u->query_present = TRUE;
break;
case CURLUPART_FRAGMENT:
storep = &u->fragment;
u->fragment_present = TRUE;
break;
case CURLUPART_URL: {
/*
@ -1972,6 +1993,6 @@ nomem:
/* set after the string, to make it not assigned if the allocation above
fails */
if(port)
u->portnum = port;
u->portnum = (unsigned short)port;
return CURLUE_OK;
}