@jmcanterafonseca-iota/anchoring-channels
Version:
Powered by IOTA Streams, Anchor Channels is an easy to be used library that allows to anchor messages to the Tangle.
69 lines • 4.93 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const iota_streams_wasm_1 = require("@jmcanterafonseca-iota/iota_streams_wasm");
const anchoringChannelError_1 = __importDefault(require("../errors/anchoringChannelError"));
const anchoringChannelErrorNames_1 = __importDefault(require("../errors/anchoringChannelErrorNames"));
/**
* Service to interact with IOTA Streams Channels
*
*/
class ChannelService {
/**
* Creates a new Channel
* @param node The node on which the channel is created
* @param seed The channel's seed
*
* @returns The address of the channel created and the announce message ID
*
*/
static createChannel(node, seed) {
return __awaiter(this, void 0, void 0, function* () {
const options = new iota_streams_wasm_1.SendOptions(node, true);
const auth = new iota_streams_wasm_1.Author(seed, options.clone(), iota_streams_wasm_1.ChannelType.SingleBranch);
const response = yield auth.clone().send_announce();
const announceLink = response.get_link().copy();
return {
announceMsgID: announceLink.msg_id,
channelAddress: auth.channel_address()
};
});
}
/**
* Binds to a channel by creating the corresponding IOTA Streams Subscriber and reading
* the announce message
*
* @param request The channel details
*
* @returns IOTA Streams Subscriber object
*/
static bindToChannel(request) {
return __awaiter(this, void 0, void 0, function* () {
try {
const options = new iota_streams_wasm_1.SendOptions(request.node, true);
const subs = new iota_streams_wasm_1.Subscriber(request.seed, options.clone());
// Channel contains the channel address and the announce messageID
const channel = request.channelID;
const announceLink = iota_streams_wasm_1.Address.from_string(channel).copy();
yield subs.clone().receive_announcement(announceLink);
return subs;
}
catch (_a) {
throw new anchoringChannelError_1.default(anchoringChannelErrorNames_1.default.CHANNEL_BINDING_ERROR, `Cannot bind to channel ${request.channelID}`);
}
});
}
}
exports.default = ChannelService;
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