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#ifndef LIGHTNING_COMMON_BOLT11_H
#define LIGHTNING_COMMON_BOLT11_H
#include "config.h"
#include <bitcoin/pubkey.h>
#include <bitcoin/short_channel_id.h>
#include <ccan/list/list.h>
#include <ccan/short_types/short_types.h>
#include <common/hash_u5.h>
#include <secp256k1_recovery.h>
/* We only have 10 bits for the field length, meaning < 640 bytes */
#define BOLT11_FIELD_BYTE_LIMIT ((1 << 10) * 5 / 8)
struct bolt11_field {
struct list_node list;
char tag;
u5 *data;
};
/* BOLT #11:
* * `pubkey` (264 bits)
* * `short_channel_id` (64 bits)
* * `fee_base_msat` (32 bits, big-endian)
* * `fee_proportional_millionths` (32 bits, big-endian)
* * `cltv_expiry_delta` (16 bits, big-endian)
*/
struct route_info {
struct pubkey pubkey;
struct short_channel_id short_channel_id;
u32 fee_base_msat, fee_proportional_millionths;
u16 cltv_expiry_delta;
};
struct bolt11 {
const struct chainparams *chain;
u64 timestamp;
u64 *msatoshi; /* NULL if not specified. */
struct sha256 payment_hash;
struct pubkey receiver_id;
/* description_hash valid if and only if description is NULL. */
const char *description;
struct sha256 *description_hash;
/* How many seconds to pay from @timestamp above. */
u64 expiry;
/* How many blocks final hop requires. */
u32 min_final_cltv_expiry;
/* If non-NULL, indicates fallback addresses to pay to. */
const u8 **fallbacks;
/* If non-NULL: array of route arrays */
struct route_info **routes;
/* signature of sha256 of entire thing. */
secp256k1_ecdsa_signature sig;
struct list_head extra_fields;
};
/* Decodes and checks signature; returns NULL on error; description is
* (optional) out-of-band description of payment, for `h` field. */
struct bolt11 *bolt11_decode(const tal_t *ctx, const char *str,
const char *description, char **fail);
/* Initialize an empty bolt11 struct with optional amount */
struct bolt11 *new_bolt11(const tal_t *ctx, u64 *msatoshi);
/* Encodes and signs, even if it's nonsense. */
char *bolt11_encode_(const tal_t *ctx,
const struct bolt11 *b11, bool n_field,
bool (*sign)(const u5 *u5bytes,
const u8 *hrpu8,
secp256k1_ecdsa_recoverable_signature *rsig,
void *arg),
void *arg);
#define bolt11_encode(ctx, b11, n_field, sign, arg) \
bolt11_encode_((ctx), (b11), (n_field), \
typesafe_cb_preargs(bool, void *, (sign), (arg), \
const u5 *, \
const u8 *, \
secp256k1_ecdsa_recoverable_signature *rsig), \
(arg))
#endif /* LIGHTNING_COMMON_BOLT11_H */