/*
* Copyright (C) 2009-2012 the libgit2 contributors
*
* 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"
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 const char *skip_leading_spaces(const char *buffer, const char *buffer_end)
{
while (*buffer == ' ' && buffer < buffer_end)
buffer++;
return buffer;
}
static const char *skip_trailing_spaces(const char *buffer_start, const char *buffer_end)
{
while (*buffer_end == ' ' && buffer_end > buffer_start)
buffer_end--;
return buffer_end;
}
static int signature_error(const char *msg)
{
giterr_set(GITERR_INVALID, "Failed to process signature - %s", msg);
return -1;
}
static int process_trimming(const char *input, char **storage, const char *input_end, int fail_when_empty)
{
const char *left, *right;
size_t trimmed_input_length;
assert(storage);
left = skip_leading_spaces(input, input_end);
right = skip_trailing_spaces(input, input_end - 1);
if (right < left) {
if (fail_when_empty)
return signature_error("input is either empty of contains only spaces");
right = left - 1;
}
trimmed_input_length = right - left + 1;
*storage = git__malloc(trimmed_input_length + 1);
GITERR_CHECK_ALLOC(*storage);
memcpy(*storage, left, trimmed_input_length);
(*storage)[trimmed_input_length] = 0;
return 0;
}
static bool contains_angle_brackets(const char *input)
{
if (strchr(input, '<') != NULL)
return true;
return strchr(input, '>') != NULL;
}
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;
p = git__calloc(1, sizeof(git_signature));
GITERR_CHECK_ALLOC(p);
if (process_trimming(name, &p->name, name + strlen(name), 1) < 0 ||
process_trimming(email, &p->email, email + strlen(email), 1) < 0)
{
git_signature_free(p);
return -1;
}
if (contains_angle_brackets(p->email) ||
contains_angle_brackets(p->name))
{
git_signature_free(p);
return signature_error("Neither `name` nor `email` should contain angle brackets chars.");
}
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;
if (git_signature_new(&new, sig->name, sig->email, sig->when.time, sig->when.offset) < 0)
return NULL;
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;
}
static int timezone_error(const char *msg)
{
giterr_set(GITERR_INVALID, "Failed to parse TZ offset - %s", msg);
return -1;
}
static int parse_timezone_offset(const char *buffer, int *offset_out)
{
int dec_offset;
int mins, hours, offset;
const char *offset_start;
const char *offset_end;
offset_start = buffer;
if (*offset_start == '\n') {
*offset_out = 0;
return 0;
}
if (offset_start[0] != '-' && offset_start[0] != '+')
return timezone_error("does not start with '+' or '-'");
if (offset_start[1] < '0' || offset_start[1] > '9')
return timezone_error("expected initial digit");
if (git__strtol32(&dec_offset, offset_start + 1, &offset_end, 10) < 0)
return timezone_error("not a valid number");
if (offset_end - offset_start != 5)
return timezone_error("invalid length");
if (dec_offset > 1400)
return timezone_error("value too large");
hours = dec_offset / 100;
mins = dec_offset % 100;
if (hours > 14) // see http://www.worldtimezone.com/faq.html
return timezone_error("hour value too large");
if (mins > 59)
return timezone_error("minutes value too large");
offset = (hours * 60) + mins;
if (offset_start[0] == '-')
offset *= -1;
*offset_out = offset;
return 0;
}
static int process_next_token(const char **buffer_out, char **storage,
const char *token_end, const char *right_boundary)
{
int error = process_trimming(*buffer_out, storage, token_end, 0);
if (error < 0)
return error;
*buffer_out = token_end + 1;
if (*buffer_out > right_boundary)
return signature_error("signature is too short");
return 0;
}
static const char *scan_for_previous_token(const char *buffer, const char *left_boundary)
{
const char *start;
if (buffer <= left_boundary)
return NULL;
start = skip_trailing_spaces(left_boundary, buffer);
/* Search for previous occurence of space */
while (start[-1] != ' ' && start > left_boundary)
start--;
return start;
}
static int parse_time(git_time_t *time_out, const char *buffer)
{
int time;
int error;
if (*buffer == '+' || *buffer == '-') {
giterr_set(GITERR_INVALID, "Failed while parsing time. '%s' actually looks like a timezone offset.", buffer);
return -1;
}
error = git__strtol32(&time, buffer, &buffer, 10);
if (!error)
*time_out = (git_time_t)time;
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 *line_end, *name_end, *email_end, *tz_start, *time_start;
int error = 0;
memset(sig, 0x0, sizeof(git_signature));
if ((line_end = memchr(buffer, ender, buffer_end - buffer)) == NULL)
return signature_error("no newline given");
if (header) {
const size_t header_len = strlen(header);
if (memcmp(buffer, header, header_len) != 0)
return signature_error("expected prefix doesn't match actual");
buffer += header_len;
}
if (buffer > line_end)
return signature_error("signature too short");
if ((name_end = strchr(buffer, '<')) == NULL)
return signature_error("character '<' not allowed in signature");
if ((email_end = strchr(name_end, '>')) == NULL)
return signature_error("character '>' not allowed in signature");
if (email_end < name_end)
return signature_error("malformed e-mail");
error = process_next_token(&buffer, &sig->name, name_end, line_end);
if (error < 0)
return error;
error = process_next_token(&buffer, &sig->email, email_end, line_end);
if (error < 0)
return error;
tz_start = scan_for_previous_token(line_end - 1, buffer);
if (tz_start == NULL)
goto clean_exit; /* No timezone nor date */
time_start = scan_for_previous_token(tz_start - 1, buffer);
if (time_start == NULL || parse_time(&sig->when.time, time_start) < 0) {
/* The tz_start might point at the time */
parse_time(&sig->when.time, tz_start);
goto clean_exit;
}
if (parse_timezone_offset(tz_start, &sig->when.offset) < 0) {
sig->when.time = 0; /* Bogus timezone, we reset the time */
}
clean_exit:
*buffer_out = line_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);
}
