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127 lines
3.3 KiB
JavaScript
127 lines
3.3 KiB
JavaScript
var Meta = module.exports;
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var deduplicate = require("./deduplicate");
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/* Metadata fields:
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* channel <STRING>
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* validateKey <STRING>
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* owners <ARRAY>
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* ADD_OWNERS
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* RM_OWNERS
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* expire <NUMBER>
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*/
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var commands = {};
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// ["ADD_OWNERS", ["7eEqelGso3EBr5jHlei6av4r9w2B9XZiGGwA1EgZ-5I="], 1561623438989]
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commands.ADD_OWNERS = function (meta, args) {
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// bail out if args isn't an array
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if (!Array.isArray(args)) {
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throw new Error('METADATA_INVALID_OWNERS');
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}
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// you shouldn't be able to get here if there are no owners
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// because only an owner should be able to change the owners
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if (!Array.isArray(meta.owners)) {
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throw new Error("METADATA_NONSENSE_OWNERS");
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}
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args.forEach(function (owner) {
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if (meta.owners.indexOf(owner) >= 0) { return; }
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meta.owners.push(owner);
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});
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};
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// ["RM_OWNERS", ["CrufexqXcY-z+eKJlEbNELVy5Sb7E-EAAEFI8GnEtZ0="], 1561623439989]
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commands.RM_OWNERS = function (meta, args) {
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// what are you doing if you don't have owners to remove?
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if (!Array.isArray(args)) {
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throw new Error('METADATA_INVALID_OWNERS');
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}
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// if there aren't any owners to start, this is also pointless
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if (!Array.isArray(meta.owners)) {
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throw new Error("METADATA_NONSENSE_OWNERS");
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}
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// remove owners one by one
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// we assume there are no duplicates
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args.forEach(function (owner) {
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var index = meta.owners.indexOf(owner);
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if (index < 0) { return; }
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meta.owners.splice(index, 1);
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});
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};
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// ["RESET_OWNERS", ["7eEqelGso3EBr5jHlei6av4r9w2B9XZiGGwA1EgZ-5I="], 1561623439989]
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commands.RESET_OWNERS = function (meta, args) {
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// expect a new array, even if it's empty
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if (!Array.isArray(args)) {
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throw new Error('METADATA_INVALID_OWNERS');
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}
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// assume there are owners to start
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if (!Array.isArray(meta.owners)) {
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throw new Error("METADATA_NONSENSE_OWNERS");
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}
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// overwrite the existing owners with the new one
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meta.owners = deduplicate(args);
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};
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commands.UPDATE_EXPIRATION = function () {
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};
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var handleCommand = function (meta, line) {
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var command = line[0];
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var args = line[1];
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//var time = line[2];
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if (typeof(commands[command]) !== 'function') {
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throw new Error("METADATA_UNSUPPORTED_COMMAND");
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}
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commands[command](meta, args);
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};
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Meta.createLineHandler = function (ref, errorHandler) {
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ref.meta = {};
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ref.index = 0;
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return function (err, line) {
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if (err) {
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return void errorHandler('METADATA_HANDLER_LINE_ERR', {
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error: err,
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index: ref.index,
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line: JSON.stringify(line),
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});
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}
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if (Array.isArray(line)) {
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ref.index++;
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try {
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handleCommand(ref.meta, line);
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} catch (err2) {
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errorHandler("METADATA_COMMAND_ERR", {
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error: err2.stack,
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line: line,
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});
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}
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return;
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}
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if (ref.index === 0 && typeof(line) === 'object') {
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ref.index++;
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// special case!
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ref.meta = line;
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return;
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}
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errorHandler("METADATA_HANDLER_WEIRDLINE", {
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line: line,
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index: ref.index++,
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});
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};
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};
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