solid-notification-client
Version:
Client library for Solid Notifications Protocol v0.2.0
117 lines (116 loc) • 7.05 kB
JavaScript
;
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Object.defineProperty(exports, "__esModule", { value: true });
exports.fetchSubscriptionUrl = exports.lookupStorageDescription = void 0;
var solid_client_authn_isomorphic_1 = require("@rubensworks/solid-client-authn-isomorphic");
var community_server_1 = require("@solid/community-server");
var Util_1 = require("./Util");
/**
* Looks up the storageDescription URL of a solid pod by looking for the `http://www.w3.org/ns/solid#storageDescription` Link value.
*
* @param url - the URL of the solid pod. (any resource in the pod is fine; all resources MUST advertise this Link header when the solid pod is a Resource Server. See 2.1 Discovery of the spec )
*/
function lookupStorageDescription(url, session) {
var _a;
if (session === void 0) { session = new solid_client_authn_isomorphic_1.Session(); }
return __awaiter(this, void 0, void 0, function () {
var response, linkHeaders, parsedLinkHeaders, storageDescription, _i, parsedLinkHeaders_1, _b, target, parameters;
return __generator(this, function (_c) {
switch (_c.label) {
case 0: return [4 /*yield*/, session.fetch(url, { method: 'HEAD' })
// parse link header and look for rel=`http://www.w3.org/ns/solid#storageDescription`
];
case 1:
response = _c.sent();
linkHeaders = (_a = response.headers.get('Link')) !== null && _a !== void 0 ? _a : "";
parsedLinkHeaders = (0, community_server_1.parseLinkHeader)(linkHeaders);
for (_i = 0, parsedLinkHeaders_1 = parsedLinkHeaders; _i < parsedLinkHeaders_1.length; _i++) {
_b = parsedLinkHeaders_1[_i], target = _b.target, parameters = _b.parameters;
if (parameters.rel === community_server_1.SOLID.storageDescription) {
storageDescription = target;
}
}
// throw error if not found
if (!storageDescription) {
throw Error("No storage description found in Link Header");
}
// return value if found
return [2 /*return*/, storageDescription];
}
});
});
}
exports.lookupStorageDescription = lookupStorageDescription;
/**
* Fetches the subscription URL of a Resource Server by first fetching the solid:StorageDescription URL and then extracting the WebSocketChannel2023 from the body.
* @param url - the Url of the solid pod.
* @returns
*/
function fetchSubscriptionUrl(url, type, session) {
if (session === void 0) { session = new solid_client_authn_isomorphic_1.Session(); }
return __awaiter(this, void 0, void 0, function () {
var storageDescriptionUrl, response, store, notificationChannels, webSocketChannel, _i, notificationChannels_1, notificationChannel;
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, lookupStorageDescription(url, session)];
case 1:
storageDescriptionUrl = _a.sent();
return [4 /*yield*/, session.fetch(storageDescriptionUrl)];
case 2:
response = _a.sent();
return [4 /*yield*/, (0, Util_1.parseResponse)(response)];
case 3:
store = _a.sent();
notificationChannels = store.getObjects(null, community_server_1.NOTIFY.terms.subscription, null);
for (_i = 0, notificationChannels_1 = notificationChannels; _i < notificationChannels_1.length; _i++) {
notificationChannel = notificationChannels_1[_i];
if (store.getQuads(notificationChannel, community_server_1.NOTIFY.channelType, type, null).length === 1) {
webSocketChannel = store.getQuads(notificationChannel, community_server_1.NOTIFY.channelType, type, null)[0].subject.value;
}
}
// throw error if not found
if (!webSocketChannel) {
throw Error("No WebSocketChannel found in the storage description resource.");
}
// return value if found
return [2 /*return*/, webSocketChannel];
}
});
});
}
exports.fetchSubscriptionUrl = fetchSubscriptionUrl;