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curl: add %{header_json} support in -w handling

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Outputs all response headers as a JSON object.
This commit is contained in:
Daniel Stenberg 2022-03-17 17:55:06 +01:00
parent 2d45137e1e
commit 4133a69f2d
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GPG key ID: 5CC908FDB71E12C2
6 changed files with 66 additions and 10 deletions
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56
src/tool_writeout_json.c
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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -29,12 +29,12 @@
#include "tool_writeout_json.h"
#include "tool_writeout.h"
void jsonWriteString(FILE *stream, const char *in)
{
const char *i = in;
const char *in_end = in + strlen(in);
fputc('\"', stream);
for(; i < in_end; i++) {
switch(*i) {
case '\\':
@ -68,6 +68,7 @@ void jsonWriteString(FILE *stream, const char *in)
break;
}
}
fputc('\"', stream);
}
void ourWriteOutJSON(FILE *stream, const struct writeoutvar mappings[],
@ -85,7 +86,54 @@ void ourWriteOutJSON(FILE *stream, const struct writeoutvar mappings[],
/* The variables are sorted in alphabetical order but as a special case
curl_version (which is not actually a --write-out variable) is last. */
fprintf(stream, "\"curl_version\":\"");
fprintf(stream, "\"curl_version\":");
jsonWriteString(stream, curl_version());
fprintf(stream, "\"}");
fprintf(stream, "}");
}
#ifdef _MSC_VER
/* warning C4706: assignment within conditional expression */
#pragma warning(disable:4706)
#endif
void headerJSON(FILE *stream, struct per_transfer *per)
{
struct curl_header *header;
struct curl_header *prev = NULL;
fputc('{', stream);
while((header = curl_easy_nextheader(per->curl, CURLH_HEADER, -1,
prev))) {
if(prev)
fputs(",\n", stream);
jsonWriteString(stream, header->name);
fputc(':', stream);
prev = header;
if(header->amount > 1) {
if(!header->index) {
/* act on the 0-index entry and pull the others in, then output in a
JSON list */
size_t a = header->amount;
size_t i = 0;
char *name = header->name;
fputc('[', stream);
do {
jsonWriteString(stream, header->value);
if(++i >= a)
break;
fputc(',', stream);
if(curl_easy_header(per->curl, name, i, CURLH_HEADER,
-1, &header))
break;
} while(1);
}
fputc(']', stream);
}
else {
fputc('[', stream);
jsonWriteString(stream, header->value);
fputc(']', stream);
}
}
fputs("\n}", stream);
}