@microsoft/useragent-sdk/dist/src/resolvers/HttpResolver.js

SDK for building decentralized identity wallets and enterprise agents.

"use strict";
/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
Object.defineProperty(exports, "__esModule", { value: true });
require('es6-promise').polyfill();
require("isomorphic-fetch");
const IdentifierDocument_1 = require("../IdentifierDocument");
const UserAgentError_1 = require("../UserAgentError");
/**
 * Fetches DID Documents from remote resolvers over http
 * @class
 * @implements Resolver
 */
class HttpResolver {
    /**
     * Constructs an instance of the HttpResolver class.
     * @param url of the remote resolver.
     * @param [options] for configuring the resolver.
     */
    constructor(url, options) {
        this.url = url;
        this.options = options;
        // Format the url
        const slash = url.endsWith('/') ? '' : '/';
        this.url = `${url}${slash}1.0/identifiers/`;
        this.timeoutInMilliseconds =
            1000 *
                (!this.options || !this.options.timeoutInSeconds
                    ? 30
                    : this.options.timeoutInSeconds);
    }
    /**
     * Sends a fetch request to the resolver URL including the
     * specified identifier.
     * @param identifier to resolve.
     */
    async resolve(identifier) {
        const query = `${this.url}${identifier.id}`;
        return new Promise(async (resolve, reject) => {
            const timer = setTimeout(() => reject(new UserAgentError_1.default('Fetch timed out.')), this.timeoutInMilliseconds);
            // Now call the actual fetch with the updated options
            const response = await fetch(query);
            // Got a response so clear the timer
            clearTimeout(timer);
            // Check if the response was OK, and
            // if not return the appropriate error
            if (!response.ok) {
                let error;
                switch (response.status) {
                    case 404:
                        error = new UserAgentError_1.default(`Identifier document not found for '${identifier.id}'`);
                        break;
                    default:
                        error = new UserAgentError_1.default(`Resolver at '${this.url}' returned an error with '${response.statusText}'`);
                }
                // Reject the promise
                reject(error);
                return;
            }
            const responseJson = await response.json();
            const identifierDocument = IdentifierDocument_1.default.fromJSON(responseJson.document || responseJson);
            resolve(identifierDocument);
        });
    }
}
exports.default = HttpResolver;
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