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0b56c1ebabd54c641f266404c631f258224c2911
heimdal/lib/base/json.c

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/*
* Copyright (c) 2010 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "baselocl.h"
#include <ctype.h>
#include <base64.h>
static heim_base_once_t heim_json_once = HEIM_BASE_ONCE_INIT;
static heim_string_t heim_tid_data_uuid_key = NULL;
static const char base64_chars[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static void
json_init_once(void *arg)
{
heim_tid_data_uuid_key = __heim_string_constant("heimdal-type-data-76d7fca2-d0da-4b20-a126-1a10f8a0eae6");
}
struct twojson {
void *ctx;
void (*out)(void *, const char *);
size_t indent;
heim_json_flags_t flags;
int ret;
int first;
};
struct heim_strbuf {
char *str;
size_t len;
size_t alloced;
int enomem;
heim_json_flags_t flags;
};
static int
base2json(heim_object_t, struct twojson *);
static void
indent(struct twojson *j)
{
size_t i = j->indent;
if (j->flags & HEIM_JSON_F_ONE_LINE)
return;
while (i--)
j->out(j->ctx, "\t");
}
static void
array2json(heim_object_t value, void *ctx, int *stop)
{
struct twojson *j = ctx;
if (j->ret)
return;
if (j->first) {
j->first = 0;
} else {
j->out(j->ctx, NULL); /* eat previous '\n' if possible */
j->out(j->ctx, ",\n");
}
j->ret = base2json(value, j);
}
static void
dict2json(heim_object_t key, heim_object_t value, void *ctx)
{
struct twojson *j = ctx;
if (j->ret)
return;
if (j->first) {
j->first = 0;
} else {
j->out(j->ctx, NULL); /* eat previous '\n' if possible */
j->out(j->ctx, ",\n");
}
j->ret = base2json(key, j);
if (j->ret)
return;
j->out(j->ctx, " : \n");
j->indent++;
j->ret = base2json(value, j);
if (j->ret)
return;
j->indent--;
}
static int
base2json(heim_object_t obj, struct twojson *j)
{
heim_tid_t type;
int first = 0;
if (obj == NULL) {
if (j->flags & HEIM_JSON_F_CNULL2JSNULL) {
obj = heim_null_create();
} else if (j->flags & HEIM_JSON_F_NO_C_NULL) {
return EINVAL;
} else {
indent(j);
j->out(j->ctx, "<NULL>\n"); /* This is NOT valid JSON! */
return 0;
}
}
type = heim_get_tid(obj);
switch (type) {
case HEIM_TID_ARRAY:
indent(j);
j->out(j->ctx, "[\n");
j->indent++;
first = j->first;
j->first = 1;
heim_array_iterate_f(obj, j, array2json);
j->indent--;
if (!j->first)
j->out(j->ctx, "\n");
indent(j);
j->out(j->ctx, "]\n");
j->first = first;
break;
case HEIM_TID_DICT:
indent(j);
j->out(j->ctx, "{\n");
j->indent++;
first = j->first;
j->first = 1;
heim_dict_iterate_f(obj, j, dict2json);
j->indent--;
if (!j->first)
j->out(j->ctx, "\n");
indent(j);
j->out(j->ctx, "}\n");
j->first = first;
break;
case HEIM_TID_STRING:
indent(j);
j->out(j->ctx, "\"");
j->out(j->ctx, heim_string_get_utf8(obj));
j->out(j->ctx, "\"");
break;
case HEIM_TID_DATA: {
heim_dict_t d;
heim_string_t v;
const heim_octet_string *data;
char *b64 = NULL;
int ret;
if (j->flags & HEIM_JSON_F_NO_DATA)
return EINVAL; /* JSON doesn't do binary */
data = heim_data_get_data(obj);
ret = base64_encode(data->data, data->length, &b64);
if (ret < 0 || b64 == NULL)
return ENOMEM;
if (j->flags & HEIM_JSON_F_NO_DATA_DICT) {
indent(j);
j->out(j->ctx, "\"");
j->out(j->ctx, b64); /* base64-encode; hope there's no aliasing */
j->out(j->ctx, "\"");
free(b64);
} else {
/*
* JSON has no way to represent binary data, therefore the
* following is a Heimdal-specific convention.
*
* We encode binary data as a dict with a single very magic
* key with a base64-encoded value. The magic key includes
* a uuid, so we're not likely to alias accidentally.
*/
d = heim_dict_create(2);
if (d == NULL) {
free(b64);
return ENOMEM;
}
v = heim_string_ref_create(b64, free);
if (v == NULL) {
free(b64);
heim_release(d);
return ENOMEM;
}
ret = heim_dict_set_value(d, heim_tid_data_uuid_key, v);
heim_release(v);
if (ret) {
heim_release(d);
return ENOMEM;
}
ret = base2json(d, j);
heim_release(d);
if (ret)
return ret;
}
break;
}
case HEIM_TID_NUMBER: {
char num[32];
indent(j);
snprintf(num, sizeof (num), "%d", heim_number_get_int(obj));
j->out(j->ctx, num);
break;
}
case HEIM_TID_NULL:
indent(j);
j->out(j->ctx, "null");
break;
case HEIM_TID_BOOL:
indent(j);
j->out(j->ctx, heim_bool_val(obj) ? "true" : "false");
break;
default:
return 1;
}
return 0;
}
static int
heim_base2json(heim_object_t obj, void *ctx, heim_json_flags_t flags,
void (*out)(void *, const char *))
{
struct twojson j;
if (flags & HEIM_JSON_F_STRICT_STRINGS)
return ENOTSUP; /* Sorry, not yet! */
heim_base_once_f(&heim_json_once, NULL, json_init_once);
j.indent = 0;
j.ctx = ctx;
j.out = out;
j.flags = flags;
j.ret = 0;
j.first = 1;
return base2json(obj, &j);
}
/*
*
*/
struct parse_ctx {
unsigned long lineno;
const uint8_t *p;
const uint8_t *pstart;
const uint8_t *pend;
heim_error_t error;
size_t depth;
heim_json_flags_t flags;
};
static heim_object_t
parse_value(struct parse_ctx *ctx);
/*
* This function eats whitespace, but, critically, it also succeeds
* only if there's anything left to parse.
*/
static int
white_spaces(struct parse_ctx *ctx)
{
while (ctx->p < ctx->pend) {
uint8_t c = *ctx->p;
if (c == ' ' || c == '\t' || c == '\r') {
} else if (c == '\n') {
ctx->lineno++;
} else
return 0;
(ctx->p)++;
}
return -1;
}
static int
is_number(uint8_t n)
{
return ('0' <= n && n <= '9');
}
static heim_number_t
parse_number(struct parse_ctx *ctx)
{
int number = 0, neg = 1;
if (ctx->p >= ctx->pend)
return NULL;
if (*ctx->p == '-') {
if (ctx->p + 1 >= ctx->pend)
return NULL;
neg = -1;
ctx->p += 1;
}
while (ctx->p < ctx->pend) {
if (is_number(*ctx->p)) {
number = (number * 10) + (*ctx->p - '0');
} else {
break;
}
ctx->p += 1;
}
return heim_number_create(number * neg);
}
static heim_string_t
parse_string(struct parse_ctx *ctx)
{
const uint8_t *start;
int quote = 0;
if (ctx->flags & HEIM_JSON_F_STRICT_STRINGS) {
ctx->error = heim_error_create(EINVAL, "Strict JSON string encoding "
"not yet supported");
return NULL;
}
if (*ctx->p != '"') {
ctx->error = heim_error_create(EINVAL, "Expected a JSON string but "
"found something else at line %lu",
ctx->lineno);
return NULL;
}
start = ++ctx->p;
while (ctx->p < ctx->pend) {
if (*ctx->p == '\n') {
ctx->lineno++;
} else if (*ctx->p == '\\') {
if (ctx->p + 1 == ctx->pend)
goto out;
ctx->p++;
quote = 1;
} else if (*ctx->p == '"') {
heim_object_t o;
if (quote) {
char *p0, *p;
p = p0 = malloc(ctx->p - start);
if (p == NULL)
goto out;
while (start < ctx->p) {
if (*start == '\\') {
start++;
/* XXX validate quoted char */
}
*p++ = *start++;
}
o = heim_string_create_with_bytes(p0, p - p0);
free(p0);
} else {
o = heim_string_create_with_bytes(start, ctx->p - start);
if (o == NULL) {
ctx->error = heim_error_create_enomem();
return NULL;
}
/* If we can decode as base64, then let's */
if (ctx->flags & HEIM_JSON_F_TRY_DECODE_DATA) {
void *buf;
size_t len;
const char *s;
s = heim_string_get_utf8(o);
len = strlen(s);
if (len >= 4 && strspn(s, base64_chars) >= len - 2) {
buf = malloc(len);
if (buf == NULL) {
heim_release(o);
ctx->error = heim_error_create_enomem();
return NULL;
}
len = base64_decode(s, buf);
if (len == -1) {
free(buf);
return o;
}
heim_release(o);
o = heim_data_ref_create(buf, len, free);
}
}
}
ctx->p += 1;
return o;
}
ctx->p += 1;
}
out:
ctx->error = heim_error_create(EINVAL, "ran out of string");
return NULL;
}
static int
parse_pair(heim_dict_t dict, struct parse_ctx *ctx)
{
heim_string_t key;
heim_object_t value;
if (white_spaces(ctx))
return -1;
if (*ctx->p == '}') {
ctx->p++;
return 0;
}
if (ctx->flags & HEIM_JSON_F_STRICT_DICT)
/* JSON allows only string keys */
key = parse_string(ctx);
else
/* heim_dict_t allows any heim_object_t as key */
key = parse_value(ctx);
if (key == NULL)
/* Even heim_dict_t does not allow C NULLs as keys though! */
return -1;
if (white_spaces(ctx)) {
heim_release(key);
return -1;
}
if (*ctx->p != ':') {
heim_release(key);
return -1;
}
ctx->p += 1; /* safe because we call white_spaces() next */
if (white_spaces(ctx)) {
heim_release(key);
return -1;
}
value = parse_value(ctx);
if (value == NULL &&
(ctx->error != NULL || (ctx->flags & HEIM_JSON_F_NO_C_NULL))) {
if (ctx->error == NULL)
ctx->error = heim_error_create(EINVAL, "Invalid JSON encoding");
heim_release(key);
return -1;
}
heim_dict_set_value(dict, key, value);
heim_release(key);
heim_release(value);
if (white_spaces(ctx))
return -1;
if (*ctx->p == '}') {
/*
* Return 1 but don't consume the '}' so we can count the one
* pair in a one-pair dict
*/
return 1;
} else if (*ctx->p == ',') {
ctx->p++;
return 1;
}
return -1;
}
static heim_dict_t
parse_dict(struct parse_ctx *ctx)
{
heim_dict_t dict;
size_t count = 0;
int ret;
heim_assert(*ctx->p == '{', "string doesn't start with {");
dict = heim_dict_create(11);
if (dict == NULL) {
ctx->error = heim_error_create_enomem();
return NULL;
}
ctx->p += 1; /* safe because parse_pair() calls white_spaces() first */
while ((ret = parse_pair(dict, ctx)) > 0)
count++;
if (ret < 0) {
heim_release(dict);
return NULL;
}
if (count == 1 && !(ctx->flags & HEIM_JSON_F_NO_DATA_DICT)) {
heim_object_t v = heim_dict_copy_value(dict, heim_tid_data_uuid_key);
/*
* Binary data encoded as a dict with a single magic key with
* base64-encoded value? Decode as heim_data_t.
*/
if (v != NULL && heim_get_tid(v) == HEIM_TID_STRING) {
void *buf;
size_t len;
buf = malloc(strlen(heim_string_get_utf8(v)));
if (buf == NULL) {
heim_release(dict);
heim_release(v);
ctx->error = heim_error_create_enomem();
return NULL;
}
len = base64_decode(heim_string_get_utf8(v), buf);
heim_release(v);
if (len == -1) {
free(buf);
return dict; /* assume aliasing accident */
}
heim_release(dict);
return (heim_dict_t)heim_data_ref_create(buf, len, free);
}
}
return dict;
}
static int
parse_item(heim_array_t array, struct parse_ctx *ctx)
{
heim_object_t value;
if (white_spaces(ctx))
return -1;
if (*ctx->p == ']') {
ctx->p++; /* safe because parse_value() calls white_spaces() first */
return 0;
}
value = parse_value(ctx);
if (value == NULL &&
(ctx->error || (ctx->flags & HEIM_JSON_F_NO_C_NULL)))
return -1;
heim_array_append_value(array, value);
heim_release(value);
if (white_spaces(ctx))
return -1;
if (*ctx->p == ']') {
ctx->p++;
return 0;
} else if (*ctx->p == ',') {
ctx->p++;
return 1;
}
return -1;
}
static heim_array_t
parse_array(struct parse_ctx *ctx)
{
heim_array_t array = heim_array_create();
int ret;
heim_assert(*ctx->p == '[', "array doesn't start with [");
ctx->p += 1;
while ((ret = parse_item(array, ctx)) > 0)
;
if (ret < 0) {
heim_release(array);
return NULL;
}
return array;
}
static heim_object_t
parse_value(struct parse_ctx *ctx)
{
size_t len;
heim_object_t o;
if (white_spaces(ctx))
return NULL;
if (*ctx->p == '"') {
return parse_string(ctx);
} else if (*ctx->p == '{') {
if (ctx->depth-- == 1) {
ctx->error = heim_error_create(EINVAL, "JSON object too deep");
return NULL;
}
o = parse_dict(ctx);
ctx->depth++;
return o;
} else if (*ctx->p == '[') {
if (ctx->depth-- == 1) {
ctx->error = heim_error_create(EINVAL, "JSON object too deep");
return NULL;
}
o = parse_array(ctx);
ctx->depth++;
return o;
} else if (is_number(*ctx->p) || *ctx->p == '-') {
return parse_number(ctx);
}
len = ctx->pend - ctx->p;
if ((ctx->flags & HEIM_JSON_F_NO_C_NULL) == 0 &&
len >= 6 && memcmp(ctx->p, "<NULL>", 6) == 0) {
ctx->p += 6;
return heim_null_create();
} else if (len >= 4 && memcmp(ctx->p, "null", 4) == 0) {
ctx->p += 4;
return heim_null_create();
} else if (len >= 4 && strncasecmp((char *)ctx->p, "true", 4) == 0) {
ctx->p += 4;
return heim_bool_create(1);
} else if (len >= 5 && strncasecmp((char *)ctx->p, "false", 5) == 0) {
ctx->p += 5;
return heim_bool_create(0);
}
ctx->error = heim_error_create(EINVAL, "unknown char %c at %lu line %lu",
(char)*ctx->p,
(unsigned long)(ctx->p - ctx->pstart),
ctx->lineno);
return NULL;
}
heim_object_t
heim_json_create(const char *string, size_t max_depth, heim_json_flags_t flags,
heim_error_t *error)
{
return heim_json_create_with_bytes(string, strlen(string), max_depth, flags,
error);
}
heim_object_t
heim_json_create_with_bytes(const void *data, size_t length, size_t max_depth,
heim_json_flags_t flags, heim_error_t *error)
{
struct parse_ctx ctx;
heim_object_t o;
heim_base_once_f(&heim_json_once, NULL, json_init_once);
ctx.lineno = 1;
ctx.p = data;
ctx.pstart = data;
ctx.pend = ((uint8_t *)data) + length;
ctx.error = NULL;
ctx.flags = flags;
ctx.depth = max_depth;
o = parse_value(&ctx);
if (o == NULL && error) {
*error = ctx.error;
} else if (ctx.error) {
heim_release(ctx.error);
}
return o;
}
static void
show_printf(void *ctx, const char *str)
{
if (str == NULL)
return;
fprintf(ctx, "%s", str);
}
/**
* Dump a heimbase object to stderr (useful from the debugger!)
*
* @param obj object to dump using JSON or JSON-like format
*
* @addtogroup heimbase
*/
void
heim_show(heim_object_t obj)
{
heim_base2json(obj, stderr, HEIM_JSON_F_NO_DATA_DICT, show_printf);
}
static void
strbuf_add(void *ctx, const char *str)
{
struct heim_strbuf *strbuf = ctx;
size_t len;
if (strbuf->enomem)
return;
if (str == NULL) {
/*
* Eat the last '\n'; this is used when formatting dict pairs
* and array items so that the ',' separating them is never
* preceded by a '\n'.
*/
if (strbuf->len > 0 && strbuf->str[strbuf->len - 1] == '\n')
strbuf->len--;
return;
}
len = strlen(str);
if ((len + 1) > (strbuf->alloced - strbuf->len)) {
size_t new_len = strbuf->alloced + (strbuf->alloced >> 2) + len + 1;
char *s;
s = realloc(strbuf->str, new_len);
if (s == NULL) {
strbuf->enomem = 1;
return;
}
strbuf->str = s;
strbuf->alloced = new_len;
}
/* +1 so we copy the NUL */
(void) memcpy(strbuf->str + strbuf->len, str, len + 1);
strbuf->len += len;
if (strbuf->str[strbuf->len - 1] == '\n' &&
strbuf->flags & HEIM_JSON_F_ONE_LINE)
strbuf->len--;
}
#define STRBUF_INIT_SZ 64
heim_string_t
heim_json_copy_serialize(heim_object_t obj, heim_json_flags_t flags, heim_error_t *error)
{
heim_string_t str;
struct heim_strbuf strbuf;
int ret;
if (error)
*error = NULL;
memset(&strbuf, 0, sizeof (strbuf));
strbuf.str = malloc(STRBUF_INIT_SZ);
if (strbuf.str == NULL) {
if (error)
*error = heim_error_create_enomem();
return NULL;
}
strbuf.len = 0;
strbuf.alloced = STRBUF_INIT_SZ;
strbuf.str[0] = '\0';
strbuf.flags = flags;
ret = heim_base2json(obj, &strbuf, flags, strbuf_add);
if (ret || strbuf.enomem) {
if (error) {
if (strbuf.enomem || ret == ENOMEM)
*error = heim_error_create_enomem();
else
*error = heim_error_create(1, "Impossible to JSON-encode "
"object");
}
free(strbuf.str);
return NULL;
}
if (flags & HEIM_JSON_F_ONE_LINE) {
strbuf.flags &= ~HEIM_JSON_F_ONE_LINE;
strbuf_add(&strbuf, "\n");
}
str = heim_string_ref_create(strbuf.str, free);
if (str == NULL) {
if (error)
*error = heim_error_create_enomem();
free(strbuf.str);
}
return str;
}
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