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Viewing file:     index.js (13.45 KB)      -rw-r--r--

'use strict';

var types = require('@smithy/types');
var utilMiddleware = require('@smithy/util-middleware');
var middlewareSerde = require('@smithy/middleware-serde');
var protocolHttp = require('@smithy/protocol-http');
var protocols = require('@smithy/core/protocols');

const getSmithyContext = (context) => context[types.SMITHY_CONTEXT_KEY] || (context[types.SMITHY_CONTEXT_KEY] = {});

const resolveAuthOptions = (candidateAuthOptions, authSchemePreference) => {
    if (!authSchemePreference || authSchemePreference.length === 0) {
        return candidateAuthOptions;
    }
    const preferredAuthOptions = [];
    for (const preferredSchemeName of authSchemePreference) {
        for (const candidateAuthOption of candidateAuthOptions) {
            const candidateAuthSchemeName = candidateAuthOption.schemeId.split("#")[1];
            if (candidateAuthSchemeName === preferredSchemeName) {
                preferredAuthOptions.push(candidateAuthOption);
            }
        }
    }
    for (const candidateAuthOption of candidateAuthOptions) {
        if (!preferredAuthOptions.find(({ schemeId }) => schemeId === candidateAuthOption.schemeId)) {
            preferredAuthOptions.push(candidateAuthOption);
        }
    }
    return preferredAuthOptions;
};

function convertHttpAuthSchemesToMap(httpAuthSchemes) {
    const map = new Map();
    for (const scheme of httpAuthSchemes) {
        map.set(scheme.schemeId, scheme);
    }
    return map;
}
const httpAuthSchemeMiddleware = (config, mwOptions) => (next, context) => async (args) => {
    const options = config.httpAuthSchemeProvider(await mwOptions.httpAuthSchemeParametersProvider(config, context, args.input));
    const authSchemePreference = config.authSchemePreference ? await config.authSchemePreference() : [];
    const resolvedOptions = resolveAuthOptions(options, authSchemePreference);
    const authSchemes = convertHttpAuthSchemesToMap(config.httpAuthSchemes);
    const smithyContext = utilMiddleware.getSmithyContext(context);
    const failureReasons = [];
    for (const option of resolvedOptions) {
        const scheme = authSchemes.get(option.schemeId);
        if (!scheme) {
            failureReasons.push(`HttpAuthScheme \`${option.schemeId}\` was not enabled for this service.`);
            continue;
        }
        const identityProvider = scheme.identityProvider(await mwOptions.identityProviderConfigProvider(config));
        if (!identityProvider) {
            failureReasons.push(`HttpAuthScheme \`${option.schemeId}\` did not have an IdentityProvider configured.`);
            continue;
        }
        const { identityProperties = {}, signingProperties = {} } = option.propertiesExtractor?.(config, context) || {};
        option.identityProperties = Object.assign(option.identityProperties || {}, identityProperties);
        option.signingProperties = Object.assign(option.signingProperties || {}, signingProperties);
        smithyContext.selectedHttpAuthScheme = {
            httpAuthOption: option,
            identity: await identityProvider(option.identityProperties),
            signer: scheme.signer,
        };
        break;
    }
    if (!smithyContext.selectedHttpAuthScheme) {
        throw new Error(failureReasons.join("\n"));
    }
    return next(args);
};

const httpAuthSchemeEndpointRuleSetMiddlewareOptions = {
    step: "serialize",
    tags: ["HTTP_AUTH_SCHEME"],
    name: "httpAuthSchemeMiddleware",
    override: true,
    relation: "before",
    toMiddleware: "endpointV2Middleware",
};
const getHttpAuthSchemeEndpointRuleSetPlugin = (config, { httpAuthSchemeParametersProvider, identityProviderConfigProvider, }) => ({
    applyToStack: (clientStack) => {
        clientStack.addRelativeTo(httpAuthSchemeMiddleware(config, {
            httpAuthSchemeParametersProvider,
            identityProviderConfigProvider,
        }), httpAuthSchemeEndpointRuleSetMiddlewareOptions);
    },
});

const httpAuthSchemeMiddlewareOptions = {
    step: "serialize",
    tags: ["HTTP_AUTH_SCHEME"],
    name: "httpAuthSchemeMiddleware",
    override: true,
    relation: "before",
    toMiddleware: middlewareSerde.serializerMiddlewareOption.name,
};
const getHttpAuthSchemePlugin = (config, { httpAuthSchemeParametersProvider, identityProviderConfigProvider, }) => ({
    applyToStack: (clientStack) => {
        clientStack.addRelativeTo(httpAuthSchemeMiddleware(config, {
            httpAuthSchemeParametersProvider,
            identityProviderConfigProvider,
        }), httpAuthSchemeMiddlewareOptions);
    },
});

const defaultErrorHandler = (signingProperties) => (error) => {
    throw error;
};
const defaultSuccessHandler = (httpResponse, signingProperties) => { };
const httpSigningMiddleware = (config) => (next, context) => async (args) => {
    if (!protocolHttp.HttpRequest.isInstance(args.request)) {
        return next(args);
    }
    const smithyContext = utilMiddleware.getSmithyContext(context);
    const scheme = smithyContext.selectedHttpAuthScheme;
    if (!scheme) {
        throw new Error(`No HttpAuthScheme was selected: unable to sign request`);
    }
    const { httpAuthOption: { signingProperties = {} }, identity, signer, } = scheme;
    const output = await next({
        ...args,
        request: await signer.sign(args.request, identity, signingProperties),
    }).catch((signer.errorHandler || defaultErrorHandler)(signingProperties));
    (signer.successHandler || defaultSuccessHandler)(output.response, signingProperties);
    return output;
};

const httpSigningMiddlewareOptions = {
    step: "finalizeRequest",
    tags: ["HTTP_SIGNING"],
    name: "httpSigningMiddleware",
    aliases: ["apiKeyMiddleware", "tokenMiddleware", "awsAuthMiddleware"],
    override: true,
    relation: "after",
    toMiddleware: "retryMiddleware",
};
const getHttpSigningPlugin = (config) => ({
    applyToStack: (clientStack) => {
        clientStack.addRelativeTo(httpSigningMiddleware(), httpSigningMiddlewareOptions);
    },
});

const normalizeProvider = (input) => {
    if (typeof input === "function")
        return input;
    const promisified = Promise.resolve(input);
    return () => promisified;
};

const makePagedClientRequest = async (CommandCtor, client, input, withCommand = (_) => _, ...args) => {
    let command = new CommandCtor(input);
    command = withCommand(command) ?? command;
    return await client.send(command, ...args);
};
function createPaginator(ClientCtor, CommandCtor, inputTokenName, outputTokenName, pageSizeTokenName) {
    return async function* paginateOperation(config, input, ...additionalArguments) {
        const _input = input;
        let token = config.startingToken ?? _input[inputTokenName];
        let hasNext = true;
        let page;
        while (hasNext) {
            _input[inputTokenName] = token;
            if (pageSizeTokenName) {
                _input[pageSizeTokenName] = _input[pageSizeTokenName] ?? config.pageSize;
            }
            if (config.client instanceof ClientCtor) {
                page = await makePagedClientRequest(CommandCtor, config.client, input, config.withCommand, ...additionalArguments);
            }
            else {
                throw new Error(`Invalid client, expected instance of ${ClientCtor.name}`);
            }
            yield page;
            const prevToken = token;
            token = get(page, outputTokenName);
            hasNext = !!(token && (!config.stopOnSameToken || token !== prevToken));
        }
        return undefined;
    };
}
const get = (fromObject, path) => {
    let cursor = fromObject;
    const pathComponents = path.split(".");
    for (const step of pathComponents) {
        if (!cursor || typeof cursor !== "object") {
            return undefined;
        }
        cursor = cursor[step];
    }
    return cursor;
};

function setFeature(context, feature, value) {
    if (!context.__smithy_context) {
        context.__smithy_context = {
            features: {},
        };
    }
    else if (!context.__smithy_context.features) {
        context.__smithy_context.features = {};
    }
    context.__smithy_context.features[feature] = value;
}

class DefaultIdentityProviderConfig {
    authSchemes = new Map();
    constructor(config) {
        for (const [key, value] of Object.entries(config)) {
            if (value !== undefined) {
                this.authSchemes.set(key, value);
            }
        }
    }
    getIdentityProvider(schemeId) {
        return this.authSchemes.get(schemeId);
    }
}

class HttpApiKeyAuthSigner {
    async sign(httpRequest, identity, signingProperties) {
        if (!signingProperties) {
            throw new Error("request could not be signed with `apiKey` since the `name` and `in` signer properties are missing");
        }
        if (!signingProperties.name) {
            throw new Error("request could not be signed with `apiKey` since the `name` signer property is missing");
        }
        if (!signingProperties.in) {
            throw new Error("request could not be signed with `apiKey` since the `in` signer property is missing");
        }
        if (!identity.apiKey) {
            throw new Error("request could not be signed with `apiKey` since the `apiKey` is not defined");
        }
        const clonedRequest = protocolHttp.HttpRequest.clone(httpRequest);
        if (signingProperties.in === types.HttpApiKeyAuthLocation.QUERY) {
            clonedRequest.query[signingProperties.name] = identity.apiKey;
        }
        else if (signingProperties.in === types.HttpApiKeyAuthLocation.HEADER) {
            clonedRequest.headers[signingProperties.name] = signingProperties.scheme
                ? `${signingProperties.scheme} ${identity.apiKey}`
                : identity.apiKey;
        }
        else {
            throw new Error("request can only be signed with `apiKey` locations `query` or `header`, " +
                "but found: `" +
                signingProperties.in +
                "`");
        }
        return clonedRequest;
    }
}

class HttpBearerAuthSigner {
    async sign(httpRequest, identity, signingProperties) {
        const clonedRequest = protocolHttp.HttpRequest.clone(httpRequest);
        if (!identity.token) {
            throw new Error("request could not be signed with `token` since the `token` is not defined");
        }
        clonedRequest.headers["Authorization"] = `Bearer ${identity.token}`;
        return clonedRequest;
    }
}

class NoAuthSigner {
    async sign(httpRequest, identity, signingProperties) {
        return httpRequest;
    }
}

const createIsIdentityExpiredFunction = (expirationMs) => function isIdentityExpired(identity) {
    return doesIdentityRequireRefresh(identity) && identity.expiration.getTime() - Date.now() < expirationMs;
};
const EXPIRATION_MS = 300_000;
const isIdentityExpired = createIsIdentityExpiredFunction(EXPIRATION_MS);
const doesIdentityRequireRefresh = (identity) => identity.expiration !== undefined;
const memoizeIdentityProvider = (provider, isExpired, requiresRefresh) => {
    if (provider === undefined) {
        return undefined;
    }
    const normalizedProvider = typeof provider !== "function" ? async () => Promise.resolve(provider) : provider;
    let resolved;
    let pending;
    let hasResult;
    let isConstant = false;
    const coalesceProvider = async (options) => {
        if (!pending) {
            pending = normalizedProvider(options);
        }
        try {
            resolved = await pending;
            hasResult = true;
            isConstant = false;
        }
        finally {
            pending = undefined;
        }
        return resolved;
    };
    if (isExpired === undefined) {
        return async (options) => {
            if (!hasResult || options?.forceRefresh) {
                resolved = await coalesceProvider(options);
            }
            return resolved;
        };
    }
    return async (options) => {
        if (!hasResult || options?.forceRefresh) {
            resolved = await coalesceProvider(options);
        }
        if (isConstant) {
            return resolved;
        }
        if (!requiresRefresh(resolved)) {
            isConstant = true;
            return resolved;
        }
        if (isExpired(resolved)) {
            await coalesceProvider(options);
            return resolved;
        }
        return resolved;
    };
};

Object.defineProperty(exports, "requestBuilder", {
    enumerable: true,
    get: function () { return protocols.requestBuilder; }
});
exports.DefaultIdentityProviderConfig = DefaultIdentityProviderConfig;
exports.EXPIRATION_MS = EXPIRATION_MS;
exports.HttpApiKeyAuthSigner = HttpApiKeyAuthSigner;
exports.HttpBearerAuthSigner = HttpBearerAuthSigner;
exports.NoAuthSigner = NoAuthSigner;
exports.createIsIdentityExpiredFunction = createIsIdentityExpiredFunction;
exports.createPaginator = createPaginator;
exports.doesIdentityRequireRefresh = doesIdentityRequireRefresh;
exports.getHttpAuthSchemeEndpointRuleSetPlugin = getHttpAuthSchemeEndpointRuleSetPlugin;
exports.getHttpAuthSchemePlugin = getHttpAuthSchemePlugin;
exports.getHttpSigningPlugin = getHttpSigningPlugin;
exports.getSmithyContext = getSmithyContext;
exports.httpAuthSchemeEndpointRuleSetMiddlewareOptions = httpAuthSchemeEndpointRuleSetMiddlewareOptions;
exports.httpAuthSchemeMiddleware = httpAuthSchemeMiddleware;
exports.httpAuthSchemeMiddlewareOptions = httpAuthSchemeMiddlewareOptions;
exports.httpSigningMiddleware = httpSigningMiddleware;
exports.httpSigningMiddlewareOptions = httpSigningMiddlewareOptions;
exports.isIdentityExpired = isIdentityExpired;
exports.memoizeIdentityProvider = memoizeIdentityProvider;
exports.normalizeProvider = normalizeProvider;
exports.setFeature = setFeature;