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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, "{$1}");
let headers = Object.assign({}, options.headers);
let body;
let parameters = omit(options, [
"method",
"baseUrl",
"url",
"headers",
"request",
"mediaType",
]);
// extract variable names from URL to calculate remaining variables later
const urlVariableNames = extractUrlVariableNames(url);
url = parseUrl(url).expand(parameters);
if (!/^http/.test(url)) {
url = options.baseUrl + url;
}
const omittedParameters = Object.keys(options)
.filter((option) => urlVariableNames.includes(option))
.concat("baseUrl");
const remainingParameters = omit(parameters, omittedParameters);
const isBinaryRequest = /application\/octet-stream/i.test(headers.accept);
if (!isBinaryRequest) {
if (options.mediaType.format) {
// e.g. application/vnd.github.v3+json => application/vnd.github.v3.raw
headers.accept = headers.accept
.split(/,/)
.map((preview) => preview.replace(/application\/vnd(\.\w+)(\.v3)?(\.\w+)?(\+json)?$/, `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);
}