feat: add fetch-based browser.js

browser.js

@@ -0,0 +1,201 @@
+'use strict';
+
+// `fetch` will be available for node and browsers as a global
+//var fetch = window.fetch;
+
+// https://developer.mozilla.org/en-US/docs/Web/API/fetch
+// https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
+let _fetchDefaults = {
+    method: 'GET', // *GET, POST, PATCH, PUT, DELETE, etc
+    headers: {},
+    body: undefined, // String, ArrayBuffer, FormData, etc
+    mode: 'cors', // no-cors, *cors, same-origin
+    credentials: 'same-origin', // omit, *same-origin, include
+    cache: 'default', // *default, no-store, reload, no-cache, force-cache, only-if-cached
+    redirect: 'follow', // *follow, error, manual,
+    referrer: undefined,
+    referrerPolicy: 'no-referrer-when-downgrade', // no-referrer, *no-referrer-when-downgrade, same-origin, origin, strict-origin, origin-when-cross-origin, strict-origin-when-cross-origin, unsafe-url
+    integrity: '',
+    keepalive: false,
+    signal: null //
+};
+
+let _optionKeys = Object.keys(_fetchDefaults).concat([
+    //'encoding', // N/A
+    //'stream', // TODO via getReader
+    //'json' // handled manually
+    //'form', // TODO
+    //'auth' // handled manually
+    //'formData', // TODO
+    //'FormData', // TODO
+    //'userAgent' // not allowed, non-standard for request.js
+]);
+
+function setDefaults(_defs) {
+    return async function request(opts) {
+        if ('string' === typeof opts) {
+            opts = { url: opts };
+        }
+        let reqOpts = { headers: {} };
+
+        if (
+            opts.body ||
+            (opts.json && true !== opts.json) ||
+            opts.form ||
+            opts.formData
+        ) {
+            // TODO this is probably a deviation from request's API
+            // need to check and probably eliminate it
+            reqOpts.method = (reqOpts.method || 'POST').toUpperCase();
+        } else {
+            reqOpts.method = (reqOpts.method || 'GET').toUpperCase();
+        }
+
+        _optionKeys.forEach(function (key) {
+            if (key in opts) {
+                if ('undefined' !== typeof opts[key]) {
+                    reqOpts[key] = opts[key];
+                }
+            } else if (key in _defs) {
+                reqOpts[key] = _defs[key];
+            }
+        });
+
+        if (opts.auth) {
+            // if opts.uri specifies auth it will be parsed by url.parse and passed directly to the http module
+            if ('string' !== typeof opts.auth) {
+                let u = opts.auth.user || opts.auth.username || '';
+                let p = opts.auth.pass || opts.auth.password || '';
+                reqOpts.headers.Authorization = encodeBasicAuth(`${u}:${p}`);
+            } else if ('string' === typeof opts.auth) {
+                reqOpts.headers.Authorization = encodeBasicAuth(`${opts.auth}`);
+            }
+
+            // [request-compat]
+            if (opts.auth.bearer) {
+                // having a shortcut for base64 encoding makes sense,
+                // but this? Eh, whatevs...
+                reqOpts.header.Authorization = `Bearer ${opts.auth.bearer}`;
+            }
+        }
+
+        let body;
+        if (opts.json && true !== opts.json) {
+            if (!opts.headers['content-type']) {
+                opts.headers['content-type'] = 'application/json';
+            }
+            body = JSON.stringify(opts.json);
+            if (!opts.method) {
+                opts.method = 'POST';
+            }
+        }
+
+        // The node version will send HTTP Auth by default, but not Cookies.
+        // We don't have an equivalent option for `fetch`. Furthermore,
+        // `fetch` caches HTTP Auth Basic across browser refreshes,
+        // which is not analogous to the node behavior.
+        //
+        // "In the face of ambiguity, refuse the temptation to guess"
+        //
+        //if (!('credentials' in opts)) {
+        //    opts.credentials = 'include';
+        //}
+
+        if (!('mode' in opts)) {
+            reqOpts.mode = 'cors';
+        }
+        if (!('body' in opts)) {
+            if (body) {
+                reqOpts.body = body;
+            }
+        }
+
+        let resp = await fetch(opts.url, reqOpts);
+
+        let result = {
+            ok: resp.ok,
+            headers: headersToObj(resp.headers),
+            body: undefined,
+            // swapped to match request.js
+            statusCode: resp.status,
+            status: resp.statusText,
+            request: reqOpts,
+            response: resp
+        };
+        result.toJSON = function () {
+            return {
+                ok: result.ok,
+                headers: result.headers,
+                body: result.body,
+                statusCode: result.statusCode,
+                status: result.status
+            };
+        };
+
+        // return early if there's no body
+        if (!result.headers['content-type']) {
+            return result;
+        }
+
+        // TODO blob, formData ?
+        if (null === opts.encoding) {
+            return await resp.arrayBuffer();
+        }
+
+        if (!opts.json) {
+            result.body = await resp.text();
+        } else {
+            result.body = await resp.json().catch(async function () {
+                return await resp.text();
+            });
+        }
+        return result;
+    };
+}
+
+/**
+ * @param {Iterable.<*>} rheaders
+ * @returns {Object.<String, String>}
+ */
+function headersToObj(rheaders) {
+    /*
+    Array.from(resp.headers.entries()).forEach(function (h) {
+        headers[h[0]] = h[1];
+    });
+    */
+    let headerNames = Array.from(rheaders.keys());
+    let resHeaders = {};
+    headerNames.forEach(function (k) {
+        resHeaders[k] = rheaders.get(k);
+    });
+    return resHeaders;
+}
+
+/**
+ * @param {String} utf8
+ * @returns {String}
+ */
+function encodeBasicAuth(utf8) {
+    let b64 = unicodeToBase64(utf8);
+    return `Basic ${b64}`;
+}
+
+/**
+ * @param {String} utf8
+ * @returns {String}
+ */
+function unicodeToBase64(utf8) {
+    let str = '';
+    let uint8 = new TextEncoder().encode(utf8);
+    uint8.forEach(function (b) {
+        str += String.fromCharCode(b);
+    });
+    let b64 = btoa(str);
+    return b64;
+}
+
+let defaultRequest = setDefaults({ mode: 'cors' });
+exports.request = defaultRequest;
+exports.defaults = setDefaults;
+module.exports = defaultRequest;
+module.exports.defaults = setDefaults;

package.json

@@ -3,6 +3,9 @@
     "version": "1.8.3",
     "description": "A lightweight, zero-dependency drop-in replacement for request",
     "main": "index.js",
+    "browser": {
+        "index.js": "browser.js"
+    },
     "files": [
         "lib"
     ],