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/*
* 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 "common.h"
#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)
{
giterr_set(GITERR_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 char *extract_trimmed(const char *ptr, size_t len)
{
while (len && git__isspace(ptr[0])) {
ptr++; len--;
}
while (len && git__isspace(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;
assert(name && 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));
GITERR_CHECK_ALLOC(p);
p->name = extract_trimmed(name, strlen(name));
p->email = extract_trimmed(email, strlen(email));
if (p->name == NULL || p->email == NULL)
return -1; /* oom */
if (p->name[0] == '\0') {
git_signature_free(p);
return signature_error("Signature cannot have an empty name");
}
p->when.time = time;
p->when.offset = offset;
*sig_out = p;
return 0;
}
git_signature *git_signature_dup(const git_signature *sig)
{
git_signature *new = git__calloc(1, sizeof(git_signature));
if (new == NULL)
return NULL;
new->name = git__strdup(sig->name);
new->email = git__strdup(sig->email);
new->when.time = sig->when.time;
new->when.offset = sig->when.offset;
return new;
}
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__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 ((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__strtol64(&sig->when.time, time_start, &time_end, 10) < 0)
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__strtol32(&offset, 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;
if (tz_start[0] == '-')
sig->when.offset = -sig->when.offset;
}
}
}
*buffer_out = buffer_end + 1;
return 0;
}
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) ? '-' : '+';
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);
}
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