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