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/**
* This file is part of Haketilo.
*
* Function: Allow content scripts to query IndexedDB through messages to
* background script.
*
* Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use of this code in a
* proprietary program, I am not going to enforce this in court.
*/
#IMPORT common/indexeddb.js AS haketilodb
#FROM common/browser.js IMPORT browser
async function get_resource_files(getting, id) {
if (getting.defs_by_res_id.has(id))
return;
getting.defs_by_res_id.set(id, null);
const definition = await haketilodb.idb_get(getting.tx, "resource", id);
if (!definition)
throw {haketilo_error_type: "missing", id};
getting.defs_by_res_id.set(id, definition);
const file_proms = (definition.scripts || [])
.map(s => haketilodb.idb_get(getting.tx, "file", s.sha256));
const deps_proms = (definition.dependencies || [])
.map(res_ref => get_resource_files(getting, res_ref.identifier));
const files = (await Promise.all(file_proms)).map(f => f.contents);
getting.files_by_res_id.set(id, files);
await Promise.all(deps_proms);
}
function get_files_list(defs_by_res_id, files_by_res_id, root_id) {
const processed = new Set(), to_process = [["start", root_id]],
trace = new Set(), files = [];
while (to_process.length > 0) {
const [what, id] = to_process.pop();
if (what === "end") {
trace.delete(id);
files.push(...files_by_res_id.get(id));
continue;
}
if (trace.has(id))
throw {haketilo_error_type: "circular", id};
if (processed.has(id))
continue;
trace.add(id);
to_process.push(["end", id]);
processed.add(id);
const ds = (defs_by_res_id.get(id).dependencies || []).reverse();
ds.forEach(res_ref => to_process.push(["start", res_ref.identifier]));
}
return files;
}
async function send_resource_files(root_resource_id, send_cb) {
const db = await haketilodb.get();
const getting = {
defs_by_res_id: new Map(),
files_by_res_id: new Map(),
tx: db.transaction(["file", "resource"])
};
let prom_cbs, prom = new Promise((...cbs) => prom_cbs = cbs);
getting.tx.onerror = e => prom_cbs[1]({haketilo_error_type: "db", e});
get_resource_files(getting, root_resource_id, new Set()).then(...prom_cbs);
try {
await prom;
const files = get_files_list(
getting.defs_by_res_id,
getting.files_by_res_id,
root_resource_id
);
var to_send = {files};
} catch(e) {
if (typeof e === "object" && "haketilo_error_type" in e) {
if (e.haketilo_error_type === "db") {
console.error(e.e);
delete e.e;
}
var to_send = {error: e};
} else {
console.error(e);
var to_send = {error: {haketilo_error_type: "other"}};
}
}
send_cb(to_send);
}
function on_indexeddb_files_request([type, resource_id], sender, respond_cb) {
if (type !== "indexeddb_files")
return;
send_resource_files(resource_id, respond_cb);
return true;
}
function start() {
browser.runtime.onMessage.addListener(on_indexeddb_files_request);
}
#EXPORT start
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