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267 lines
9.8 KiB
C
267 lines
9.8 KiB
C
#ifndef LIGHTNING_COMMON_JSON_H
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#define LIGHTNING_COMMON_JSON_H
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#include "config.h"
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#include <ccan/crypto/sha256/sha256.h>
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#include <ccan/tal/tal.h>
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#include <common/errcode.h>
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#define JSMN_STRICT 1
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# include <external/jsmn/jsmn.h>
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struct json_escape;
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struct json_stream;
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struct timeabs;
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struct timespec;
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/* Include " if it's a string. */
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const char *json_tok_full(const char *buffer, const jsmntok_t *t);
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/* Include " if it's a string. */
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int json_tok_full_len(const jsmntok_t *t);
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/* Is this a string equal to str? */
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bool json_tok_streq(const char *buffer, const jsmntok_t *tok, const char *str);
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/* Is this a string equal to str of length len? */
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bool json_tok_strneq(const char *buffer, const jsmntok_t *tok,
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const char *str, size_t len);
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/* Does this string token start with prefix? */
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bool json_tok_startswith(const char *buffer, const jsmntok_t *tok,
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const char *prefix);
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/* Does this string token end with suffix? */
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bool json_tok_endswith(const char *buffer, const jsmntok_t *tok,
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const char *suffix);
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/* Allocate a tal string copy */
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char *json_strdup(const tal_t *ctx, const char *buffer, const jsmntok_t *tok);
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/* Decode a hex-encoded binary */
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u8 *json_tok_bin_from_hex(const tal_t *ctx, const char *buffer, const jsmntok_t *tok);
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/* Extract number from this (may be a string, or a number literal) */
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bool json_to_number(const char *buffer, const jsmntok_t *tok,
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unsigned int *num);
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/* Extract number from this (may be a string, or a number literal) */
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bool json_to_u64(const char *buffer, const jsmntok_t *tok,
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uint64_t *num);
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/* Extract signed 64 bit integer from this (may be a string, or a number literal) */
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bool json_to_s64(const char *buffer, const jsmntok_t *tok, s64 *num);
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/* Extract number from this (may be a string, or a number literal) */
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bool json_to_u32(const char *buffer, const jsmntok_t *tok,
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uint32_t *num);
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/* Extract number from this (may be a string, or a number literal) */
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bool json_to_u16(const char *buffer, const jsmntok_t *tok,
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uint16_t *num);
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bool json_to_sha256(const char *buffer, const jsmntok_t *tok, struct sha256 *dest);
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/*
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* Extract a non-negative (either 0 or positive) floating-point number from this
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* (must be a number literal), multiply it by 1 million and return it as an
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* integer. Any fraction smaller than 0.000001 is ignored.
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*/
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bool json_to_millionths(const char *buffer, const jsmntok_t *tok,
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u64 *millionths);
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/* Extract signed integer from this (may be a string, or a number literal) */
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bool json_to_int(const char *buffer, const jsmntok_t *tok, int *num);
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/* Extract an error code from this (may be a string, or a number literal) */
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bool json_to_errcode(const char *buffer, const jsmntok_t *tok, errcode_t *errcode);
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/* Extract boolean from this */
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bool json_to_bool(const char *buffer, const jsmntok_t *tok, bool *b);
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/* Is this a number? [0..9]+ */
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bool json_tok_is_num(const char *buffer, const jsmntok_t *tok);
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/* Is this the null primitive? */
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bool json_tok_is_null(const char *buffer, const jsmntok_t *tok);
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/* Returns next token with same parent (WARNING: slow!). */
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const jsmntok_t *json_next(const jsmntok_t *tok);
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/* Get top-level member. */
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const jsmntok_t *json_get_member(const char *buffer, const jsmntok_t tok[],
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const char *label);
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/* Get top-level member, with explicit label length */
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const jsmntok_t *json_get_membern(const char *buffer, const jsmntok_t tok[],
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const char *label, size_t len);
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/* Get index'th array member. */
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const jsmntok_t *json_get_arr(const jsmntok_t tok[], size_t index);
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/* Allocate a starter array of tokens for json_parse_input */
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jsmntok_t *toks_alloc(const tal_t *ctx);
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/* Reset a token array to reuse it. */
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void toks_reset(jsmntok_t *toks);
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/**
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* json_parse_input: parse and validate JSON.
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* @parser: parser initialized with jsmn_init.
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* @toks: tallocated array from toks_alloc()
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* @input, @len: input string.
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* @complete: set to true if the valid JSON is complete, or NULL if must be.
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*
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* This returns false if the JSON is invalid, true otherwise.
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* If it returns true, *@complete indicates that (*@toks)[0] points to a
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* valid, complete JSON element. If @complete is NULL, then incomplete
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* JSON returns false (i.e. is considered invalid).
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*
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* *@toks is resized to the complete set of tokens, with a dummy
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* terminator (type == -1) at the end.
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*
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* If it returns true, and *@complete is false, you can append more
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* data to @input and call it again (with the same perser) and the parser
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* will continue where it left off.
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*/
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bool json_parse_input(jsmn_parser *parser,
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jsmntok_t **toks,
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const char *input, int len,
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bool *complete);
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/* Simplified version of above which parses only a complete, valid
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* JSON string */
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jsmntok_t *json_parse_simple(const tal_t *ctx, const char *input, int len);
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/* Convert a jsmntype_t enum to a human readable string. */
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const char *jsmntype_to_string(jsmntype_t t);
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/* Print a json value for debugging purposes. */
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void json_tok_print(const char *buffer, const jsmntok_t *params);
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/* Return a copy of a json value as an array. */
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jsmntok_t *json_tok_copy(const tal_t *ctx, const jsmntok_t *tok);
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/*
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* Remove @num json values from a json array or object @obj. @tok points
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* to the first value to remove. The array @tokens will be resized.
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*/
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void json_tok_remove(jsmntok_t **tokens,
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jsmntok_t *obj_or_array, const jsmntok_t *tok, size_t num);
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/* Guide is % for a token: each must be followed by JSON_SCAN().
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* Returns NULL on error (asserts() on bad guide). */
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const char *json_scan(const tal_t *ctx,
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const char *buffer,
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const jsmntok_t *tok,
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const char *guide,
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...);
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/* eg. JSON_SCAN(json_to_bool, &boolvar) */
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#define JSON_SCAN(fmt, var) \
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json_scan, \
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stringify(fmt), \
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((var) + 0*sizeof(fmt((const char *)NULL, \
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(const jsmntok_t *)NULL, var) == true)), \
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(fmt)
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/* eg. JSON_SCAN_TAL(tmpctx, json_strdup, &charvar) */
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#define JSON_SCAN_TAL(ctx, fmt, var) \
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(ctx), \
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stringify(fmt), \
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((var) + 0*sizeof((*var) = fmt((ctx), \
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(const char *)NULL, \
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(const jsmntok_t *)NULL))), \
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(fmt)
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/* Already-have-varargs version */
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const char *json_scanv(const tal_t *ctx,
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const char *buffer,
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const jsmntok_t *tok,
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const char *guide,
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va_list ap);
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/* Iterator macro for array: i is counter, t is token ptr, arr is JSMN_ARRAY */
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#define json_for_each_arr(i, t, arr) \
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for (i = 0, t = (arr) + 1; i < (arr)->size; t = json_next(t), i++)
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/* Iterator macro for object: i is counter, t is token ptr (t+1 is
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* contents of obj member), obj is JSMN_OBJECT */
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#define json_for_each_obj(i, t, obj) \
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for (i = 0, t = (obj) + 1; i < (obj)->size; t = json_next(t+1), i++)
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/* '"fieldname" : "value"' or '"value"' if fieldname is NULL. Turns
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* any non-printable chars into JSON escapes, but leaves existing escapes alone.
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*/
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void json_add_string(struct json_stream *result, const char *fieldname, const char *value);
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/* '"fieldname" : "value[:value_len]"' or '"value[:value_len]"' if
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* fieldname is NULL. Turns any non-printable chars into JSON
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* escapes, but leaves existing escapes alone.
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*/
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void json_add_stringn(struct json_stream *result, const char *fieldname,
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const char *value TAKES, size_t value_len);
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/* '"fieldname" : "value"' or '"value"' if fieldname is NULL. String must
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* already be JSON escaped as necessary. */
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void json_add_escaped_string(struct json_stream *result,
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const char *fieldname,
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const struct json_escape *esc TAKES);
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/* '"fieldname" : literal' or 'literal' if fieldname is NULL*/
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void json_add_literal(struct json_stream *result, const char *fieldname,
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const char *literal, int len);
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/* '"fieldname" : value' or 'value' if fieldname is NULL */
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void json_add_num(struct json_stream *result, const char *fieldname,
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unsigned int value);
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/* '"fieldname" : value' or 'value' if fieldname is NULL */
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void json_add_u64(struct json_stream *result, const char *fieldname,
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uint64_t value);
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/* '"fieldname" : value' or 'value' if fieldname is NULL */
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void json_add_s64(struct json_stream *result, const char *fieldname,
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int64_t value);
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/* '"fieldname" : value' or 'value' if fieldname is NULL */
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void json_add_u32(struct json_stream *result, const char *fieldname,
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uint32_t value);
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/* '"fieldname" : value' or 'value' if fieldname is NULL */
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void json_add_s32(struct json_stream *result, const char *fieldname,
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int32_t value);
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/* '"fieldname" : true|false' or 'true|false' if fieldname is NULL */
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void json_add_bool(struct json_stream *result, const char *fieldname,
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bool value);
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/* '"fieldname" : null' or 'null' if fieldname is NULL */
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void json_add_null(struct json_stream *stream, const char *fieldname);
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/* '"fieldname" : "0189abcdef..."' or "0189abcdef..." if fieldname is NULL */
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void json_add_hex(struct json_stream *result, const char *fieldname,
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const void *data, size_t len);
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/* '"fieldname" : "0189abcdef..."' or "0189abcdef..." if fieldname is NULL */
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void json_add_hex_talarr(struct json_stream *result,
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const char *fieldname,
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const tal_t *data);
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void json_add_timeabs(struct json_stream *result, const char *fieldname,
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struct timeabs t);
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/* used in log.c and notification.c*/
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void json_add_time(struct json_stream *result, const char *fieldname,
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struct timespec ts);
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/* Add ISO_8601 timestamp string, i.e. "2019-09-07T15:50+01:00" */
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void json_add_timeiso(struct json_stream *result,
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const char *fieldname,
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struct timeabs *time);
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/* Add any json token */
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void json_add_tok(struct json_stream *result, const char *fieldname,
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const jsmntok_t *tok, const char *buffer);
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/* Add an error code */
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void json_add_errcode(struct json_stream *result, const char *fieldname,
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errcode_t code);
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/* Add "bolt11" or "bolt12" field, depending on invstring. */
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void json_add_invstring(struct json_stream *result, const char *invstring);
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#endif /* LIGHTNING_COMMON_JSON_H */
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