/* ui-clone.c: functions for http cloning, based on
 * git's http-backend.c by Shawn O. Pearce
 *
 * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
 *
 * Licensed under GNU General Public License v2
 *   (see COPYING for full license text)
 */

#include "cgit.h"
#include "ui-clone.h"
#include "html.h"
#include "ui-shared.h"

static int print_ref_info(const char *refname, const struct object_id *oid,
                          int flags, void *cb_data)
{
	struct object *obj;

	if (!(obj = parse_object(oid->hash)))
		return 0;

	htmlf("%s\t%s\n", oid_to_hex(oid), refname);
	if (obj->type == OBJ_TAG) {
		if (!(obj = deref_tag(obj, refname, 0)))
			return 0;
		htmlf("%s\t%s^{}\n", oid_to_hex(&obj->oid), refname);
	}
	return 0;
}

static void print_pack_info(void)
{
	struct packed_git *pack;
	char *offset;

	ctx.page.mimetype = "text/plain";
	ctx.page.filename = "objects/info/packs";
	cgit_print_http_headers();
	prepare_packed_git();
	for (pack = packed_git; pack; pack = pack->next) {
		if (pack->pack_local) {
			offset = strrchr(pack->pack_name, '/');
			if (offset && offset[1] != '\0')
				++offset;
			else
				offset = pack->pack_name;
			htmlf("P %s\n", offset);
		}
	}
}

static void send_file(const char *path)
{
	struct stat st;

	if (stat(path, &st)) {
		switch (errno) {
		case ENOENT:
			cgit_print_error_page(404, "Not found", "Not found");
			break;
		case EACCES:
			cgit_print_error_page(403, "Forbidden", "Forbidden");
			break;
		default:
			cgit_print_error_page(400, "Bad request", "Bad request");
		}
		return;
	}
	ctx.page.mimetype = "application/octet-stream";
	ctx.page.filename = path;
	skip_prefix(path, ctx.repo->path, &ctx.page.filename);
	skip_prefix(ctx.page.filename, "/", &ctx.page.filename);
	cgit_print_http_headers();
	html_include(path);
}

void cgit_clone_info(void)
{
	if (!ctx.qry.path || strcmp(ctx.qry.path, "refs")) {
		cgit_print_error_page(400, "Bad request", "Bad request");
		return;
	}

	ctx.page.mimetype = "text/plain";
	ctx.page.filename = "info/refs";
	cgit_print_http_headers();
	for_each_ref(print_ref_info, NULL);
	/* NOTE: we pass an empty prefix because we want to enumerate everything
	   not just all refs under $namespace/refs/ */
	cgit_for_each_namespaced_ref_in("", print_ref_info, NULL);
}

void cgit_clone_objects(void)
{
	if (!ctx.qry.path) {
		cgit_print_error_page(400, "Bad request", "Bad request");
		return;
	}

	if (!strcmp(ctx.qry.path, "info/packs")) {
		print_pack_info();
		return;
	}

	send_file(git_path("objects/%s", ctx.qry.path));
}

void cgit_clone_head(void)
{
	if (get_git_namespace()) {
		unsigned char unused[20];
		char *namespaced_head = NULL;
		const char *ref;
		namespaced_head = mkpathdup("%sHEAD", get_git_namespace());
		/* NOTE: RESOLVE_REF_NO_RECURSE is required to prevent it resolving HEAD
		   into a ref outside of the namespace. */
		ref = resolve_ref_unsafe(namespaced_head, RESOLVE_REF_NO_RECURSE, unused, NULL);
		if (!ref) {
			cgit_print_error_page(404, "Not found", "Not found");
			free(namespaced_head);
			return;
		}
		cgit_print_http_headers();
		htmlf("ref: %s\n", strip_namespace(ref));
		free(namespaced_head);
	} else {
		send_file(git_path("%s", "HEAD"));
	}
}