import { addQueryParameters } from "./util/add-query-parameters"; import { extractUrlVariableNames } from "./util/extract-url-variable-names"; import { omit } from "./util/omit"; import { parseUrl } from "./util/url-template"; export function parse(options) { // https://fetch.spec.whatwg.org/#methods let method = options.method.toUpperCase(); // replace :varname with {varname} to make it RFC 6570 compatible let url = options.url.replace(/:([a-z]\w+)/g, "{+$1}"); let headers = Object.assign({}, options.headers); let body; let parameters = omit(options, [ "method", "baseUrl", "url", "headers", "request", "mediaType" ]); // extract variable names from URL to calculate remaining variables later const urlVariableNames = extractUrlVariableNames(url); url = parseUrl(url).expand(parameters); if (!/^http/.test(url)) { url = options.baseUrl + url; } const omittedParameters = Object.keys(options) .filter(option => urlVariableNames.includes(option)) .concat("baseUrl"); const remainingParameters = omit(parameters, omittedParameters); const isBinaryRequset = /application\/octet-stream/i.test(headers.accept); if (!isBinaryRequset) { if (options.mediaType.format) { // e.g. application/vnd.github.v3+json => application/vnd.github.v3.raw headers.accept = headers.accept .split(/,/) .map(preview => preview.replace(/application\/vnd(\.\w+)(\.v3)?(\.\w+)?(\+json)?$/, `application/vnd$1$2.${options.mediaType.format}`)) .join(","); } if (options.mediaType.previews.length) { const previewsFromAcceptHeader = headers.accept.match(/[\w-]+(?=-preview)/g) || []; headers.accept = previewsFromAcceptHeader .concat(options.mediaType.previews) .map(preview => { const format = options.mediaType.format ? `.${options.mediaType.format}` : "+json"; return `application/vnd.github.${preview}-preview${format}`; }) .join(","); } } // for GET/HEAD requests, set URL query parameters from remaining parameters // for PATCH/POST/PUT/DELETE requests, set request body from remaining parameters if (["GET", "HEAD"].includes(method)) { url = addQueryParameters(url, remainingParameters); } else { if ("data" in remainingParameters) { body = remainingParameters.data; } else { if (Object.keys(remainingParameters).length) { body = remainingParameters; } else { headers["content-length"] = 0; } } } // default content-type for JSON if body is set if (!headers["content-type"] && typeof body !== "undefined") { headers["content-type"] = "application/json; charset=utf-8"; } // GitHub expects 'content-length: 0' header for PUT/PATCH requests without body. // fetch does not allow to set `content-length` header, but we can set body to an empty string if (["PATCH", "PUT"].includes(method) && typeof body === "undefined") { body = ""; } // Only return body/request keys if present return Object.assign({ method, url, headers }, typeof body !== "undefined" ? { body } : null, options.request ? { request: options.request } : null); }