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@ -2,23 +2,169 @@ var Meta = module.exports;
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var deduplicate = require("./common-util").deduplicateString;
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/* Metadata fields:
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/* Metadata fields and the commands that can modify them
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we assume that these commands can only be performed
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by owners or in some cases pending owners. Thus
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the owners field is guaranteed to exist.
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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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* RESET_OWNERS
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* pending_owners <ARRAY>
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* ADD_PENDING_OWNERS
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* RM_PENDING_OWNERS
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* expire <NUMBER>
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* UPDATE_EXPIRATION (NOT_IMPLEMENTED)
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* restricted <BOOLEAN>
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* RESTRICT_ACCESS
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* allowed <ARRAY>
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* ADD_ALLOWED
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* RM_ALLOWED
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* RESET_ALLOWED
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* ADD_OWNERS
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* RESET_OWNERS
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* mailbox <STRING|MAP>
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* ADD_MAILBOX
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* RM_MAILBOX
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*/
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var commands = {};
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var isValidOwner = function (owner) {
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var isValidPublicKey = function (owner) {
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return typeof(owner) === 'string' && owner.length === 44;
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};
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// isValidPublicKey is a better indication of what the above function does
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// I'm preserving this function name in case we ever want to expand its
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// criteria at a later time...
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var isValidOwner = isValidPublicKey;
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// ["RESTRICT_ACCESS", [true], 1561623438989]
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// ["RESTRICT_ACCESS", [false], 1561623438989]
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commands.RESTRICT_ACCESS = function (meta, args) {
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if (!Array.isArray(args) || typeof(args[0]) !== 'boolean') {
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throw new Error('INVALID_STATE');
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}
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var bool = args[0];
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// reject the proposed command if there is no change in state
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if (meta.restricted === bool) { return false; }
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// apply the new state
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meta.restricted = args[0];
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// if you're disabling access restrictions then you can assume
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// then there is nothing more to do. Leave the existing list as-is
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if (!bool) { return true; }
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// you're all set if an allow list already exists
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if (Array.isArray(meta.allowed)) { return true; }
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// otherwise define it
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meta.allowed = [];
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return true;
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};
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// ["ADD_ALLOWED", ["7eEqelGso3EBr5jHlei6av4r9w2B9XZiGGwA1EgZ-5I=", ...], 1561623438989]
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commands.ADD_ALLOWED = function (meta, args) {
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if (!Array.isArray(args)) {
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throw new Error("INVALID_ARGS");
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}
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var allowed = meta.allowed || [];
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var changed = false;
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args.forEach(function (arg) {
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// don't add invalid public keys
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if (!isValidPublicKey(arg)) { return; }
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// don't add owners to the allow list
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if (meta.owners.indexOf(arg) >= 0) { return; }
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// don't duplicate entries in the allow list
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if (allowed.indexOf(arg) >= 0) { return; }
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allowed.push(arg);
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changed = true;
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});
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if (changed) {
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meta.allowed = meta.allowed || allowed;
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}
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return changed;
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};
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// ["RM_ALLOWED", ["7eEqelGso3EBr5jHlei6av4r9w2B9XZiGGwA1EgZ-5I=", ...], 1561623438989]
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commands.RM_ALLOWED = function (meta, args) {
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if (!Array.isArray(args)) {
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throw new Error("INVALID_ARGS");
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}
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// there may not be anything to remove
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if (!meta.allowed) { return false; }
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var changed = false;
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args.forEach(function (arg) {
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var index = meta.allowed.indexOf(arg);
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if (index < 0) { return; }
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meta.allowed.splice(index, 1);
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changed = true;
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});
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return changed;
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};
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var arrayHasChanged = function (A, B) {
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var changed;
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A.some(function (a) {
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if (B.indexOf(a) < 0) { return (changed = true); }
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});
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if (changed) { return true; }
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B.some(function (b) {
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if (A.indexOf(b) < 0) { return (changed = true); }
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});
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return changed;
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};
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var filterInPlace = function (A, f) {
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for (var i = A.length - 1; i >= 0; i--) {
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if (f(A[i], i, A)) { A.splice(i, 1); }
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}
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};
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// ["RESET_ALLOWED", ["7eEqelGso3EBr5jHlei6av4r9w2B9XZiGGwA1EgZ-5I=", ...], 1561623438989]
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commands.RESET_ALLOWED = function (meta, args) {
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if (!Array.isArray(args)) { throw new Error("INVALID_ARGS"); }
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var updated = args.filter(function (arg) {
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// don't allow invalid public keys
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if (!isValidPublicKey(arg)) { return false; }
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// don't ever add owners to the allow list
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if (meta.owners.indexOf(arg)) { return false; }
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return true;
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});
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// this is strictly an optimization...
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// a change in length is a clear indicator of a functional change
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if (meta.allowed && meta.allowed.length !== updated.length) {
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meta.allowed = updated;
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return true;
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}
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// otherwise we must check that the arrays contain distinct elements
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// if there is no functional change, then return false
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if (!arrayHasChanged(meta.allowed, updated)) { return false; }
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// otherwise overwrite the in-memory data and indicate that there was a change
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meta.allowed = updated;
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return true;
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};
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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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@ -40,6 +186,13 @@ commands.ADD_OWNERS = function (meta, args) {
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changed = true;
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});
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if (changed && Array.isArray(meta.allowed)) {
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// make sure owners are not included in the allow list
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filterInPlace(meta.allowed, function (member) {
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return meta.owners.indexOf(member) !== -1;
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});
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}
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return changed;
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};
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@ -141,6 +294,14 @@ commands.RESET_OWNERS = function (meta, args) {
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// overwrite the existing owners with the new one
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meta.owners = deduplicate(args.filter(isValidOwner));
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if (Array.isArray(meta.allowed)) {
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// make sure owners are not included in the allow list
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filterInPlace(meta.allowed, function (member) {
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return meta.owners.indexOf(member) !== -1;
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});
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}
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return true;
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};
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@ -178,6 +339,25 @@ commands.ADD_MAILBOX = function (meta, args) {
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return changed;
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};
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commands.RM_MAILBOX = function (meta, args) {
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if (!Array.isArray(args)) { throw new Error("INVALID_ARGS"); }
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if (!meta.mailbox || typeof(meta.mailbox) === 'undefined') {
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return false;
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}
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if (typeof(meta.mailbox) === 'string' && args.length === 0) {
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delete meta.mailbox;
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return true;
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}
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var changed = false;
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args.forEach(function (arg) {
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if (meta.mailbox[arg] === 'undefined') { return; }
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delete meta.mailbox[arg];
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changed = true;
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});
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return changed;
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};
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commands.UPDATE_EXPIRATION = function () {
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throw new Error("E_NOT_IMPLEMENTED");
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};
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yflory
5 years ago