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/* vi:set et sw=2 sts=2 cin cino=t0,f0,(0,{s,>2s,n-s,^-s,e-s:
* Copyright © 2024 Red Hat, Inc
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Owen Taylor <otaylor@redhat.com>
*/
#include "flatpak-docker-reference-private.h"
#include "flatpak-utils-private.h"
struct _FlatpakDockerReference
{
char *uri;
char *repository;
char *tag;
char *digest;
};
/*
* Parsing here is loosely based off:
*
* https://github.com/containers/image/tree/main/docker/reference
*
* The major simplification is that we require a domain component, and
* don't have any default domain. This removes ambiguity between domains and paths
* and makes parsing much simpler. We also don't normalize single component
* paths (e.g. ubuntu => library/ubuntu.)
*/
#define TAG "[0-9A-Za-z_][0-9A-Za-z_-]{0,127}"
#define DIGEST "[A-Za-z][A-Za-z0-9]*(?:[-_+.][A-Za-z][A-Za-z0-9]*)*[:][[:xdigit:]]{32,}"
#define REMAINDER_TAG_AND_DIGEST_RE "^(.*?)(:" TAG ")?" "(@" DIGEST ")?$"
static GRegex *
get_remainder_tag_and_digest_regex (void)
{
static gsize regex = 0;
if (g_once_init_enter (®ex))
{
g_autoptr(GRegex) compiled = g_regex_new (REMAINDER_TAG_AND_DIGEST_RE,
G_REGEX_DEFAULT,
G_REGEX_MATCH_DEFAULT,
NULL);
g_once_init_leave (®ex, (gsize)g_steal_pointer (&compiled));
}
return (GRegex *)regex;
}
FlatpakDockerReference *
flatpak_docker_reference_parse (const char *reference_str,
GError **error)
{
g_autoptr(FlatpakDockerReference) reference = g_new0 (FlatpakDockerReference, 1);
GRegex *regex = get_remainder_tag_and_digest_regex ();
g_autoptr(GMatchInfo) match_info = NULL;
g_autofree char *tag_match = NULL;
g_autofree char *digest_match = NULL;
g_autofree char *remainder = NULL;
g_autofree char *domain = NULL;
gboolean matched;
const char *slash;
matched = g_regex_match (regex, reference_str, G_REGEX_MATCH_DEFAULT, &match_info);
g_assert (matched);
tag_match = g_match_info_fetch (match_info, 2);
if (tag_match[0] == '\0')
reference->tag = NULL;
else
reference->tag = g_strdup (tag_match + 1);
digest_match = g_match_info_fetch (match_info, 3);
if (digest_match[0] == '\0')
reference->digest = NULL;
else
reference->digest = g_strdup (digest_match + 1);
remainder = g_match_info_fetch (match_info, 1);
slash = strchr (remainder, '/');
if (slash == NULL || slash == reference_str || *slash == '\0')
{
flatpak_fail(error, "Can't parse %s into <domain>/<repository>", remainder);
return NULL;
}
domain = g_strndup (remainder, slash - remainder);
reference->uri = g_strconcat ("https://", domain, NULL);
reference->repository = g_strdup (slash + 1);
return g_steal_pointer (&reference);
}
const char *
flatpak_docker_reference_get_uri (FlatpakDockerReference *reference)
{
return reference->uri;
}
const char *
flatpak_docker_reference_get_repository (FlatpakDockerReference *reference)
{
return reference->repository;
}
const char *
flatpak_docker_reference_get_tag (FlatpakDockerReference *reference)
{
return reference->tag;
}
const char *
flatpak_docker_reference_get_digest (FlatpakDockerReference *reference)
{
return reference->digest;
}
void
flatpak_docker_reference_free (FlatpakDockerReference *reference)
{
g_clear_pointer (&reference->uri, g_free);
g_clear_pointer (&reference->repository, g_free);
g_clear_pointer (&reference->tag, g_free);
g_clear_pointer (&reference->digest, g_free);
g_free (reference);
}
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