/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "signature.h"
#include "repository.h"
#include "git2/common.h"
#include "posix.h"
void git_signature_free(git_signature *sig)
{
if (sig == NULL)
return;
git__free(sig->name);
sig->name = NULL;
git__free(sig->email);
sig->email = NULL;
git__free(sig);
}
static int signature_error(const char *msg)
{
git_error_set(GIT_ERROR_INVALID, "failed to parse signature - %s", msg);
return -1;
}
static bool contains_angle_brackets(const char *input)
{
return strchr(input, '<') != NULL || strchr(input, '>') != NULL;
}
static bool is_crud(unsigned char c)
{
return c <= 32 ||
c == '.' ||
c == ',' ||
c == ':' ||
c == ';' ||
c == '<' ||
c == '>' ||
c == '"' ||
c == '\\' ||
c == '\'';
}
static char *extract_trimmed(const char *ptr, size_t len)
{
while (len && is_crud((unsigned char)ptr[0])) {
ptr++; len--;
}
while (len && is_crud((unsigned char)ptr[len - 1])) {
len--;
}
return git__substrdup(ptr, len);
}
int git_signature_new(git_signature **sig_out, const char *name, const char *email, git_time_t time, int offset)
{
git_signature *p = NULL;
GIT_ASSERT_ARG(name);
GIT_ASSERT_ARG(email);
*sig_out = NULL;
if (contains_angle_brackets(name) ||
contains_angle_brackets(email)) {
return signature_error(
"Neither `name` nor `email` should contain angle brackets chars.");
}
p = git__calloc(1, sizeof(git_signature));
GIT_ERROR_CHECK_ALLOC(p);
p->name = extract_trimmed(name, strlen(name));
GIT_ERROR_CHECK_ALLOC(p->name);
p->email = extract_trimmed(email, strlen(email));
GIT_ERROR_CHECK_ALLOC(p->email);
if (p->name[0] == '\0' || p->email[0] == '\0') {
git_signature_free(p);
return signature_error("Signature cannot have an empty name or email");
}
p->when.time = time;
p->when.offset = offset;
p->when.sign = (offset < 0) ? '-' : '+';
*sig_out = p;
return 0;
}
int git_signature_dup(git_signature **dest, const git_signature *source)
{
git_signature *signature;
if (source == NULL)
return 0;
signature = git__calloc(1, sizeof(git_signature));
GIT_ERROR_CHECK_ALLOC(signature);
signature->name = git__strdup(source->name);
GIT_ERROR_CHECK_ALLOC(signature->name);
signature->email = git__strdup(source->email);
GIT_ERROR_CHECK_ALLOC(signature->email);
signature->when.time = source->when.time;
signature->when.offset = source->when.offset;
signature->when.sign = source->when.sign;
*dest = signature;
return 0;
}
int git_signature__pdup(git_signature **dest, const git_signature *source, git_pool *pool)
{
git_signature *signature;
if (source == NULL)
return 0;
signature = git_pool_mallocz(pool, sizeof(git_signature));
GIT_ERROR_CHECK_ALLOC(signature);
signature->name = git_pool_strdup(pool, source->name);
GIT_ERROR_CHECK_ALLOC(signature->name);
signature->email = git_pool_strdup(pool, source->email);
GIT_ERROR_CHECK_ALLOC(signature->email);
signature->when.time = source->when.time;
signature->when.offset = source->when.offset;
signature->when.sign = source->when.sign;
*dest = signature;
return 0;
}
int git_signature_now(git_signature **sig_out, const char *name, const char *email)
{
time_t now;
time_t offset;
struct tm *utc_tm;
git_signature *sig;
struct tm _utc;
*sig_out = NULL;
/*
* Get the current time as seconds since the epoch and
* transform that into a tm struct containing the time at
* UTC. Give that to mktime which considers it a local time
* (tm_isdst = -1 asks it to take DST into account) and gives
* us that time as seconds since the epoch. The difference
* between its return value and 'now' is our offset to UTC.
*/
time(&now);
utc_tm = p_gmtime_r(&now, &_utc);
utc_tm->tm_isdst = -1;
offset = (time_t)difftime(now, mktime(utc_tm));
offset /= 60;
if (git_signature_new(&sig, name, email, now, (int)offset) < 0)
return -1;
*sig_out = sig;
return 0;
}
int git_signature_default(git_signature **out, git_repository *repo)
{
int error;
git_config *cfg;
const char *user_name, *user_email;
if ((error = git_repository_config_snapshot(&cfg, repo)) < 0)
return error;
if (!(error = git_config_get_string(&user_name, cfg, "user.name")) &&
!(error = git_config_get_string(&user_email, cfg, "user.email")))
error = git_signature_now(out, user_name, user_email);
git_config_free(cfg);
return error;
}
int git_signature__parse(git_signature *sig, const char **buffer_out,
const char *buffer_end, const char *header, char ender)
{
const char *buffer = *buffer_out;
const char *email_start, *email_end;
memset(sig, 0, sizeof(git_signature));
if (ender &&
(buffer_end = memchr(buffer, ender, buffer_end - buffer)) == NULL)
return signature_error("no newline given");
if (header) {
const size_t header_len = strlen(header);
if (buffer + header_len >= buffer_end || memcmp(buffer, header, header_len) != 0)
return signature_error("expected prefix doesn't match actual");
buffer += header_len;
}
email_start = git__memrchr(buffer, '<', buffer_end - buffer);
email_end = git__memrchr(buffer, '>', buffer_end - buffer);
if (!email_start || !email_end || email_end <= email_start)
return signature_error("malformed e-mail");
email_start += 1;
sig->name = extract_trimmed(buffer, email_start - buffer - 1);
sig->email = extract_trimmed(email_start, email_end - email_start);
/* Do we even have a time at the end of the signature? */
if (email_end + 2 < buffer_end) {
const char *time_start = email_end + 2;
const char *time_end;
if (git__strntol64(&sig->when.time, time_start,
buffer_end - time_start, &time_end, 10) < 0) {
git__free(sig->name);
git__free(sig->email);
sig->name = sig->email = NULL;
return signature_error("invalid Unix timestamp");
}
/* do we have a timezone? */
if (time_end + 1 < buffer_end) {
int offset, hours, mins;
const char *tz_start, *tz_end;
tz_start = time_end + 1;
if ((tz_start[0] != '-' && tz_start[0] != '+') ||
git__strntol32(&offset, tz_start + 1,
buffer_end - tz_start - 1, &tz_end, 10) < 0) {
/* malformed timezone, just assume it's zero */
offset = 0;
}
hours = offset / 100;
mins = offset % 100;
/*
* only store timezone if it's not overflowing;
* see http://www.worldtimezone.com/faq.html
*/
if (hours <= 14 && mins <= 59) {
sig->when.offset = (hours * 60) + mins;
sig->when.sign = tz_start[0];
if (tz_start[0] == '-')
sig->when.offset = -sig->when.offset;
}
}
}
*buffer_out = buffer_end + 1;
return 0;
}
int git_signature_from_buffer(git_signature **out, const char *buf)
{
git_signature *sig;
const char *buf_end;
int error;
GIT_ASSERT_ARG(out);
GIT_ASSERT_ARG(buf);
*out = NULL;
sig = git__calloc(1, sizeof(git_signature));
GIT_ERROR_CHECK_ALLOC(sig);
buf_end = buf + strlen(buf);
error = git_signature__parse(sig, &buf, buf_end, NULL, '\0');
if (error)
git__free(sig);
else
*out = sig;
return error;
}
void git_signature__writebuf(git_buf *buf, const char *header, const git_signature *sig)
{
int offset, hours, mins;
char sign;
offset = sig->when.offset;
sign = (sig->when.offset < 0 || sig->when.sign == '-') ? '-' : '+';
if (offset < 0)
offset = -offset;
hours = offset / 60;
mins = offset % 60;
git_buf_printf(buf, "%s%s <%s> %u %c%02d%02d\n",
header ? header : "", sig->name, sig->email,
(unsigned)sig->when.time, sign, hours, mins);
}
bool git_signature__equal(const git_signature *one, const git_signature *two)
{
GIT_ASSERT_ARG(one);
GIT_ASSERT_ARG(two);
return
git__strcmp(one->name, two->name) == 0 &&
git__strcmp(one->email, two->email) == 0 &&
one->when.time == two->when.time &&
one->when.offset == two->when.offset &&
one->when.sign == two->when.sign;
}
