/*
 *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the License); you may
 *  not use this file except in compliance with the License.
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 */


#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <gmssl/pem.h>
#include <gmssl/x509.h>
#include <gmssl/x509_ext.h>
#include <gmssl/x509_crl.h>
#include <gmssl/file.h>


static const char *usage = "-in revoked_certs.der -key pem -pass str -cacert pem [-next_update time] "
	"[-gen_authority_key_id] [-crl_num num] [-delta_crl_indicator num] [-ca_issuers_uri uri] [-ocsp_uri uri] [-out crl.der]";

static void print_options(const char *prog)
{
	printf("Options\n");
	printf("\n");
	printf("    -in revoked_certs.der             To be revoked certificate list\n");
	printf("                                      This input file format is DER-encoding of SEQUENCE OF RevokedCertificate\n");
	printf("                                      revoked_certs.der can be generated by `gmssl certrevoke`\n");
	printf("\n");
	printf("    -key pkcs8.pem                    The issuer private key.\n");
	printf("\n");
	printf("    -cacert cert.pem                  The issuer certificate.\n");
	printf("\n");
	printf("    -next_update time                 Optional CRL attribute.\n");
	printf("\n");
	printf("    -out crl.der                      Output CRL in DER-encoding\n");
}


int crlgen_main(int argc, char **argv)
{
	int ret = 1;
	char *prog = argv[0];
	char *infile = NULL;
	uint8_t *revoked_certs = NULL;
	size_t revoked_certs_len = 0;
	char *outfile = NULL;
	FILE *outfp = stdout;
	char *keyfile = NULL;
	char *pass = NULL;
	FILE *keyfp = NULL;
	SM2_KEY sign_key;
	char *cacertfile = NULL;
	uint8_t *cacert = NULL;
	size_t cacert_len = 0;
	const uint8_t *issuer;
	size_t issuer_len;
	time_t next_update = -1;

	uint8_t exts[512];
	size_t extslen = 0;
	int gen_authority_key_id = 0;
	int crl_num = -1;
	int delta_crl_indicator = -1;
	char *http_uri = NULL;
	char *ldap_uri = NULL;
	char *ca_issuers_uri = NULL;
	char *ocsp_uri = NULL;

	uint8_t outbuf[64 * 1024];
	uint8_t *out = outbuf;
	size_t outlen = 0;

	argc--;
	argv++;

	while (argc > 0) {
		if (!strcmp(*argv, "-help")) {
			printf("usage: %s %s\n", prog, usage);
			printf("\n");
			print_options(prog);
			goto end;

		} else if (!strcmp(*argv, "-in")) {
			if (--argc < 1) goto bad;
			infile = *(++argv);
			if (file_read_all(infile, &revoked_certs, &revoked_certs_len) != 1) {
				fprintf(stderr, "%s: read input file failed\n", prog);
				goto end;
			}
		} else if (!strcmp(*argv, "-out")) {
			if (--argc < 1) goto bad;
			outfile = *(++argv);
			if (!(outfp = fopen(outfile, "wb"))) {
				fprintf(stderr, "%s: open '%s' failure : %s\n", prog, outfile, strerror(errno));
				goto end;
			}
		} else if (!strcmp(*argv, "-key")) {
			if (--argc < 1) goto bad;
			keyfile = *(++argv);
			if (!(keyfp = fopen(keyfile, "rb"))) {
				fprintf(stderr, "%s: open '%s' failure : %s\n", prog, keyfile, strerror(errno));
				goto end;
			}
		} else if (!strcmp(*argv, "-pass")) {
			if (--argc < 1) goto bad;
		} else if (!strcmp(*argv, "-cacert")) {
			if (--argc < 1) goto bad;
			cacertfile = *(++argv);
			if (x509_cert_new_from_file(&cacert, &cacert_len, cacertfile) != 1) {
				goto end;
			}
		} else if (!strcmp(*argv, "-next_update")) {
			if (--argc < 1) goto bad;
			if (asn1_time_from_str(0, &next_update, *(++argv)) != 1) {
				fprintf(stderr, "%s: invalid time format for '-next_update', should be 'YYYYMMDDHHMMSSZ'\n", prog);
				goto bad;
			}
		} else if (!strcmp(*argv, "-gen_authority_key_id")) {
			gen_authority_key_id = 1;
		} else if (!strcmp(*argv, "-crl_num")) {
			if (--argc < 1) goto bad;
			crl_num = atoi(*(++argv));
		} else if (!strcmp(*argv, "-delta_crl_indicator")) {
			if (--argc < 1) goto bad;
			delta_crl_indicator = atoi(*(++argv));
		} else if (!strcmp(*argv, "-http_uri")) {
			if (--argc < 1) goto bad;
			http_uri = *(++argv);
		} else if (!strcmp(*argv, "-ldap_uri")) {
			if (--argc < 1) goto bad;
			ldap_uri = *(++argv);
		} else if (!strcmp(*argv, "-ca_issuers_uri")) {
			ca_issuers_uri = *(++argv);
		} else if (!strcmp(*argv, "-ocsp_uri")) {
			if (--argc < 1) goto bad;
			ocsp_uri = *(++argv);
		} else {
			fprintf(stderr, "%s: illegal option '%s'\n", prog, *argv);
			goto end;
bad:
			fprintf(stderr, "%s: '%s' option value missing\n", prog, *argv);
			goto end;
		}

		argc--;
		argv++;
	}

	if (!infile) {
		fprintf(stderr, "%s: '-in' option required\n", prog);
		goto end;
	}

	if (!cacertfile) {
		fprintf(stderr, "%s: '-cacert' option required\n", prog);
		goto end;
	}

	if (!keyfile) {
		fprintf(stderr, "%s: '-key' option required\n", prog);
		goto end;
	}
	if (!pass) {
		fprintf(stderr, "%s: '-pass' option required\n", prog);
		goto end;
	}


	if (!revoked_certs || !revoked_certs_len) {
		fprintf(stderr, "usage: %s %s\n", prog, usage);
		goto end;
	}

	if (x509_cert_get_subject(cacert, cacert_len, &issuer, &issuer_len) != 1) {
		fprintf(stderr, "%s: parse CA certificate failure\n", prog);
		goto end;
	}
	if (sm2_private_key_info_decrypt_from_pem(&sign_key, pass, keyfp) != 1) {
		fprintf(stderr, "%s: load private key failure\n", prog);
		goto end;
	}

	if (gen_authority_key_id) {
		if (x509_crl_exts_add_default_authority_key_identifier(exts, &extslen, sizeof(exts), &sign_key) != 1) {
			fprintf(stderr, "%s: inner error\n", prog);
			goto end;
		}
	}
	if (x509_crl_exts_add_crl_number(exts, &extslen, sizeof(exts), -1, crl_num) < 0
		|| x509_crl_exts_add_delta_crl_indicator(exts, &extslen, sizeof(exts), X509_critical, delta_crl_indicator) < 0) {
		fprintf(stderr, "%s: inner error\n", prog);
		goto end;
	}
	if (ca_issuers_uri || ocsp_uri) {
		if (x509_crl_exts_add_authority_info_acess(exts, &extslen, sizeof(exts), -1,
			ca_issuers_uri, ca_issuers_uri ? strlen(ca_issuers_uri) : 0,
			ocsp_uri, ocsp_uri ? strlen(ocsp_uri) : 0) != 1) {
			fprintf(stderr, "%s: inner error\n", prog);
			goto end;
		}
	}
	if (http_uri || ldap_uri) {
		if (x509_crl_exts_add_freshest_crl(exts, &extslen, sizeof(exts), -1,
			http_uri, http_uri ? strlen(http_uri) : 0,
			ldap_uri, ldap_uri ? strlen(ldap_uri) : 0) != 1) {
			fprintf(stderr, "%s: inner error\n", prog);
			goto end;
		}
	}

	if (x509_crl_sign_to_der(
		X509_version_v2,
		OID_sm2sign_with_sm3,
		issuer, issuer_len,
		time(NULL), next_update,
		revoked_certs, revoked_certs_len,
		extslen ? exts : NULL, extslen,
		&sign_key, SM2_DEFAULT_ID, SM2_DEFAULT_ID_LENGTH,
		&out, &outlen) != 1) {

	//	error_print();
		return -1;
	}

	if (fwrite(outbuf, 1, outlen, outfp) != outlen) {
		fprintf(stderr, "%s: output failure\n", prog);
		return -1;
	}
	ret = 0;

end:
	//if (cert) free(cert);
	if (outfile && outfp) fclose(outfp);
	return ret;
}