53 lines
2.3 KiB
JavaScript
53 lines
2.3 KiB
JavaScript
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import { NODE_REGION_CONFIG_OPTIONS } from "@aws-sdk/config-resolver";
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import { getInstanceMetadataEndpoint, httpRequest } from "@aws-sdk/credential-provider-imds";
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import { loadConfig } from "@aws-sdk/node-config-provider";
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import { memoize } from "@aws-sdk/property-provider";
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import { AWS_DEFAULT_REGION_ENV, AWS_EXECUTION_ENV, AWS_REGION_ENV, DEFAULTS_MODE_OPTIONS, ENV_IMDS_DISABLED, IMDS_REGION_PATH, } from "./constants";
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import { NODE_DEFAULTS_MODE_CONFIG_OPTIONS } from "./defaultsModeConfig";
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export const resolveDefaultsModeConfig = ({ region = loadConfig(NODE_REGION_CONFIG_OPTIONS), defaultsMode = loadConfig(NODE_DEFAULTS_MODE_CONFIG_OPTIONS), } = {}) => memoize(async () => {
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const mode = typeof defaultsMode === "function" ? await defaultsMode() : defaultsMode;
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switch (mode?.toLowerCase()) {
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case "auto":
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return resolveNodeDefaultsModeAuto(region);
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case "in-region":
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case "cross-region":
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case "mobile":
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case "standard":
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case "legacy":
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return Promise.resolve(mode?.toLocaleLowerCase());
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case undefined:
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return Promise.resolve("legacy");
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default:
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throw new Error(`Invalid parameter for "defaultsMode", expect ${DEFAULTS_MODE_OPTIONS.join(", ")}, got ${mode}`);
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}
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});
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const resolveNodeDefaultsModeAuto = async (clientRegion) => {
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if (clientRegion) {
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const resolvedRegion = typeof clientRegion === "function" ? await clientRegion() : clientRegion;
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const inferredRegion = await inferPhysicalRegion();
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if (!inferredRegion) {
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return "standard";
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}
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if (resolvedRegion === inferredRegion) {
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return "in-region";
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}
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else {
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return "cross-region";
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}
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}
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return "standard";
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};
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const inferPhysicalRegion = async () => {
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if (process.env[AWS_EXECUTION_ENV] && (process.env[AWS_REGION_ENV] || process.env[AWS_DEFAULT_REGION_ENV])) {
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return process.env[AWS_REGION_ENV] ?? process.env[AWS_DEFAULT_REGION_ENV];
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}
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if (!process.env[ENV_IMDS_DISABLED]) {
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try {
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const endpoint = await getInstanceMetadataEndpoint();
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return (await httpRequest({ ...endpoint, path: IMDS_REGION_PATH })).toString();
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}
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catch (e) {
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}
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}
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};
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