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/**
* This file is part of Haketilo.
*
* Function: Getting available content for site from remote repositories.
*
* Copyright (C) 2021 Wojtek Kosior
*
* 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 this code in a
* proprietary program, I am not going to enforce this in court.
*/
#IMPORT common/observables.js
#FROM common/ajax.js IMPORT make_ajax_request
#FROM common/stored_types.js IMPORT TYPE_PREFIX
#FROM common/sanitize_JSON.js IMPORT parse_json_with_schema
#FROM common/misc.js IMPORT matchers
const paths = {
[TYPE_PREFIX.PAGE]: "/pattern",
[TYPE_PREFIX.BAG]: "/bag",
[TYPE_PREFIX.SCRIPT]: "/script",
[TYPE_PREFIX.URL]: "/query"
};
const queried_items = new Map();
const observable = observables.make();
function repo_query(prefix, item, repo_urls)
{
const key = prefix + item;
const results = queried_items.get(key) || {};
queried_items.set(key, results);
for (const repo_url of repo_urls)
perform_query_against(key, repo_url, results);
}
#EXPORT repo_query AS query
const page_schema = {
pattern: matchers.nonempty_string,
payload: ["optional", matchers.component, "default", undefined]
};
const bag_schema = {
name: matchers.nonempty_string,
components: ["optional", [matchers.component, "repeat"], "default", []]
};
const script_schema = {
name: matchers.nonempty_string,
location: matchers.nonempty_string,
sha256: matchers.sha256,
};
const search_result_schema = [page_schema, "repeat"];
const schemas = {
[TYPE_PREFIX.PAGE]: page_schema,
[TYPE_PREFIX.BAG]: bag_schema,
[TYPE_PREFIX.SCRIPT]: script_schema,
[TYPE_PREFIX.URL]: search_result_schema
}
async function perform_query_against(key, repo_url, results)
{
if (results[repo_url] !== undefined)
return;
const prefix = key[0];
const item = key.substring(1);
const result = {state: "started"};
results[repo_url] = result;
const broadcast_msg = {prefix, item, results: {[repo_url]: result}};
observables.broadcast(observable, broadcast_msg);
let state = "connection_error";
const query_url =
`${repo_url}${paths[prefix]}?n=${encodeURIComponent(item)}`;
try {
let xhttp = await make_ajax_request("GET", query_url);
if (xhttp.status === 200) {
state = "parse_error";
result.response =
parse_json_with_schema(schemas[prefix], xhttp.responseText);
state = "completed";
}
} catch (e) {
console.log(e);
}
result.state = state;
observables.broadcast(observable, broadcast_msg);
}
function subscribe_results(cb)
{
observables.subscribe(observable, cb);
for (const [key, results] of queried_items.entries())
cb({prefix: key[0], item: key.substring(1), results});
}
#EXPORT subscribe_results
function unsubscribe_results(cb)
{
observables.unsubscribe(observable, cb);
}
#EXPORT unsubscribe_results
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