@nativescript/core/fetch/index.js

(function () {
    "use strict";

    var support = {
        searchParams: "URLSearchParams" in global,
        iterable: "Symbol" in global && "iterator" in Symbol,
        blob:
            "FileReader" in global &&
            "Blob" in global &&
            (function () {
                try {
                    new Blob();
                    return true;
                } catch (e) {
                    return false;
                }
            })(),
        formData: "FormData" in global,
        arrayBuffer: "ArrayBuffer" in global
    };

    function isDataView(obj) {
        return obj && DataView.prototype.isPrototypeOf(obj);
    }

    if (support.arrayBuffer) {
        var viewClasses = [
            "[object Int8Array]",
            "[object Uint8Array]",
            "[object Uint8ClampedArray]",
            "[object Int16Array]",
            "[object Uint16Array]",
            "[object Int32Array]",
            "[object Uint32Array]",
            "[object Float32Array]",
            "[object Float64Array]"
        ];

        var isArrayBufferView =
            ArrayBuffer.isView ||
            function (obj) {
                return (
                    obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1
                );
            };
    }

    function normalizeName(name) {
        if (typeof name !== "string") {
            name = String(name);
        }
        if (/[^a-z0-9\-#$%&'*+.^_`|~]/i.test(name)) {
            throw new TypeError("Invalid character in header field name");
        }
        return name.toLowerCase();
    }

    function normalizeValue(value) {
        if (typeof value !== "string") {
            value = String(value);
        }
        return value;
    }

    // Build a destructive iterator for the value list
    function iteratorFor(items) {
        var iterator = {
            next: function () {
                var value = items.shift();
                return { done: value === undefined, value: value };
            }
        };

        if (support.iterable) {
            iterator[Symbol.iterator] = function () {
                return iterator;
            };
        }

        return iterator;
    }

    function Headers(headers) {
        this.map = {};

        if (headers instanceof Headers) {
            headers.forEach(function (value, name) {
                this.append(name, value);
            }, this);
        } else if (Array.isArray(headers)) {
            headers.forEach(function (header) {
                this.append(header[0], header[1]);
            }, this);
        } else if (headers) {
            Object.getOwnPropertyNames(headers).forEach(function (name) {
                this.append(name, headers[name]);
            }, this);
        }
    }

    Headers.prototype.append = function (name, value) {
        name = normalizeName(name);
        value = normalizeValue(value);
        var oldValue = this.map[name];
        this.map[name] = oldValue ? oldValue + ", " + value : value;
    };

    Headers.prototype["delete"] = function (name) {
        delete this.map[normalizeName(name)];
    };

    Headers.prototype.get = function (name) {
        name = normalizeName(name);
        return this.has(name) ? this.map[name] : null;
    };

    Headers.prototype.has = function (name) {
        return this.map.hasOwnProperty(normalizeName(name));
    };

    Headers.prototype.set = function (name, value) {
        this.map[normalizeName(name)] = normalizeValue(value);
    };

    Headers.prototype.forEach = function (callback, thisArg) {
        for (var name in this.map) {
            if (this.map.hasOwnProperty(name)) {
                callback.call(thisArg, this.map[name], name, this);
            }
        }
    };

    Headers.prototype.keys = function () {
        var items = [];
        this.forEach(function (value, name) {
            items.push(name);
        });
        return iteratorFor(items);
    };

    Headers.prototype.values = function () {
        var items = [];
        this.forEach(function (value) {
            items.push(value);
        });
        return iteratorFor(items);
    };

    Headers.prototype.entries = function () {
        var items = [];
        this.forEach(function (value, name) {
            items.push([name, value]);
        });
        return iteratorFor(items);
    };

    if (support.iterable) {
        Headers.prototype[Symbol.iterator] = Headers.prototype.entries;
    }

    function consumed(body) {
        if (body.bodyUsed) {
            return Promise.reject(new TypeError("Already read"));
        }
        body.bodyUsed = true;
    }

    function fileReaderReady(reader) {
        return new Promise(function (resolve, reject) {
            reader.onload = function () {
                resolve(reader.result);
            };
            reader.onerror = function () {
                reject(reader.error);
            };
        });
    }

    function readBlobAsArrayBuffer(blob) {
        var reader = new FileReader();
        var promise = fileReaderReady(reader);
        reader.readAsArrayBuffer(blob);
        return promise;
    }

    function readBlobAsText(blob) {
        var reader = new FileReader();
        var promise = fileReaderReady(reader);
        reader.readAsText(blob);
        return promise;
    }

    function readArrayBufferAsText(buf) {
        var view = new Uint8Array(buf);
        var chars = new Array(view.length);

        for (var i = 0; i < view.length; i++) {
            chars[i] = String.fromCharCode(view[i]);
        }
        return chars.join("");
    }

    function bufferClone(buf) {
        if (buf.slice) {
            return buf.slice(0);
        } else {
            var view = new Uint8Array(buf.byteLength);
            view.set(new Uint8Array(buf));
            return view.buffer;
        }
    }

    function Body() {
        this.bodyUsed = false;

        this._initBody = function (body) {
            this._bodyInit = body;
            if (!body) {
                this._bodyText = "";
            } else if (typeof body === "string") {
                this._bodyText = body;
            } else if (support.blob && Blob.prototype.isPrototypeOf(body)) {
                this._bodyBlob = body;
            } else if (support.formData && FormData.prototype.isPrototypeOf(body)) {
                this._bodyFormData = body;
            } else if (
                support.searchParams &&
                URLSearchParams.prototype.isPrototypeOf(body)
            ) {
                this._bodyText = body.toString();
            } else if (support.arrayBuffer && support.blob && isDataView(body)) {
                this._bodyArrayBuffer = bufferClone(body.buffer);
                // IE 10-11 can't handle a DataView body.
                this._bodyInit = new Blob([this._bodyArrayBuffer]);
            } else if (
                support.arrayBuffer &&
                (ArrayBuffer.prototype.isPrototypeOf(body) || isArrayBufferView(body))
            ) {
                this._bodyArrayBuffer = bufferClone(body);
            } else {
                this._bodyText = body = Object.prototype.toString.call(body);
            }

            if (!this.headers.get("content-type")) {
                if (typeof body === "string") {
                    this.headers.set("content-type", "text/plain;charset=UTF-8");
                } else if (this._bodyBlob && this._bodyBlob.type) {
                    this.headers.set("content-type", this._bodyBlob.type);
                } else if (
                    support.searchParams &&
                    URLSearchParams.prototype.isPrototypeOf(body)
                ) {
                    this.headers.set(
                        "content-type",
                        "application/x-www-form-urlencoded;charset=UTF-8"
                    );
                }
            }
        };

        if (support.blob) {
            this.blob = function () {
                var rejected = consumed(this);
                if (rejected) {
                    return rejected;
                }

                if (this._bodyBlob) {
                    return Promise.resolve(this._bodyBlob);
                } else if (this._bodyArrayBuffer) {
                    return Promise.resolve(new Blob([this._bodyArrayBuffer]));
                } else if (this._bodyFormData) {
                    throw new Error("could not read FormData body as blob");
                } else {
                    return Promise.resolve(new Blob([this._bodyText]));
                }
            };

            this.arrayBuffer = function () {
                if (this._bodyArrayBuffer) {
                    return consumed(this) || Promise.resolve(this._bodyArrayBuffer);
                } else {
                    return this.blob().then(readBlobAsArrayBuffer);
                }
            };
        }

        this.text = function () {
            var rejected = consumed(this);
            if (rejected) {
                return rejected;
            }

            if (this._bodyBlob) {
                return readBlobAsText(this._bodyBlob);
            } else if (this._bodyArrayBuffer) {
                return Promise.resolve(readArrayBufferAsText(this._bodyArrayBuffer));
            } else if (this._bodyFormData) {
                throw new Error("could not read FormData body as text");
            } else {
                return Promise.resolve(this._bodyText);
            }
        };

        if (support.formData) {
            this.formData = function () {
                return this.text().then(decode);
            };
        }

        this.json = function () {
            return this.text().then(JSON.parse);
        };

        return this;
    }

    // HTTP methods whose capitalization should be normalized
    var methods = ["DELETE", "GET", "HEAD", "OPTIONS", "POST", "PUT"];

    function normalizeMethod(method) {
        var upcased = method.toUpperCase();
        return methods.indexOf(upcased) > -1 ? upcased : method;
    }

    function Request(input, options) {
        options = options || {};
        var body = options.body;

        if (input instanceof Request) {
            if (input.bodyUsed) {
                throw new TypeError("Already read");
            }
            this.url = input.url;
            this.credentials = input.credentials;
            if (!options.headers) {
                this.headers = new Headers(input.headers);
            }
            this.method = input.method;
            this.mode = input.mode;
            this.signal = input.signal;
            if (!body && input._bodyInit != null) {
                body = input._bodyInit;
                input.bodyUsed = true;
            }
        } else {
            this.url = String(input);
        }

        this.credentials = options.credentials || this.credentials || "same-origin";
        if (options.headers || !this.headers) {
            this.headers = new Headers(options.headers);
        }
        this.method = normalizeMethod(options.method || this.method || "GET");
        this.mode = options.mode || this.mode || null;
        this.signal = options.signal || this.signal;
        this.referrer = null;

        if ((this.method === "GET" || this.method === "HEAD") && body) {
            throw new TypeError("Body not allowed for GET or HEAD requests");
        }
        this._initBody(body);
    }

    Request.prototype.clone = function () {
        return new Request(this, { body: this._bodyInit });
    };

    function decode(body) {
        var form = new FormData();
        body
            .trim()
            .split("&")
            .forEach(function (bytes) {
                if (bytes) {
                    var split = bytes.split("=");
                    var name = split.shift().replace(/\+/g, " ");
                    var value = split.join("=").replace(/\+/g, " ");
                    form.append(decodeURIComponent(name), decodeURIComponent(value));
                }
            });
        return form;
    }

    function parseHeaders(rawHeaders) {
        var headers = new Headers();
        // Replace instances of \r\n and \n followed by at least one space or horizontal tab with a space
        // https://tools.ietf.org/html/rfc7230#section-3.2
        var preProcessedHeaders = rawHeaders.replace(/\r?\n[\t ]+/g, " ");
        preProcessedHeaders.split(/\r?\n/).forEach(function (line) {
            var parts = line.split(":");
            var key = parts.shift().trim();
            if (key) {
                var value = parts.join(":").trim();
                headers.append(key, value);
            }
        });
        return headers;
    }

    Body.call(Request.prototype);

    function Response(bodyInit, options) {
        if (!options) {
            options = {};
        }

        this.type = "default";
        this.status = options.status === undefined ? 200 : options.status;
        this.ok = this.status >= 200 && this.status < 300;
        this.statusText = "statusText" in options ? options.statusText : "OK";
        this.headers = new Headers(options.headers);
        this.url = options.url || "";
        this._initBody(bodyInit);
    }

    Body.call(Response.prototype);

    Response.prototype.clone = function () {
        return new Response(this._bodyInit, {
            status: this.status,
            statusText: this.statusText,
            headers: new Headers(this.headers),
            url: this.url
        });
    };

    Response.error = function () {
        var response = new Response(null, { status: 0, statusText: "" });
        response.type = "error";
        return response;
    };

    var redirectStatuses = [301, 302, 303, 307, 308];

    Response.redirect = function (url, status) {
        if (redirectStatuses.indexOf(status) === -1) {
            throw new RangeError("Invalid status code");
        }

        return new Response(null, { status: status, headers: { location: url } });
    };

    exports.DOMException = global.DOMException;
    try {
        new exports.DOMException();
    } catch (err) {
        exports.DOMException = function (message, name) {
            this.message = message;
            this.name = name;
            var error = Error(message);
            this.stack = error.stack;
        };
        exports.DOMException.prototype = Object.create(Error.prototype);
        exports.DOMException.prototype.constructor = exports.DOMException;
    }

    function fetch(input, init) {
        return new Promise(function (resolve, reject) {
            var request = new Request(input, init);

            if (request.signal && request.signal.aborted) {
                return reject(new exports.DOMException("Aborted", "AbortError"));
            }

            var xhr = new XMLHttpRequest();

            function abortXhr() {
                xhr.abort();
            }

            xhr.onload = function () {
                var options = {
                    status: xhr.status,
                    statusText: xhr.statusText,
                    headers: parseHeaders(xhr.getAllResponseHeaders() || "")
                };
                options.url =
                    "responseURL" in xhr
                        ? xhr.responseURL
                        : options.headers.get("X-Request-URL");
                var body = "response" in xhr ? xhr.response : xhr.responseText;
                resolve(new Response(body, options));
            };

            xhr.onerror = function () {
                reject(new TypeError("Network request failed"));
            };

            xhr.ontimeout = function () {
                reject(new TypeError("Network request failed"));
            };

            xhr.onabort = function () {
                reject(new exports.DOMException("Aborted", "AbortError"));
            };

            xhr.open(request.method, request.url, true);

            if (request.credentials === "include") {
                xhr.withCredentials = true;
            } else if (request.credentials === "omit") {
                xhr.withCredentials = false;
            }

            if ("responseType" in xhr && support.blob) {
                xhr.responseType = "blob";
            }

            request.headers.forEach(function (value, name) {
                xhr.setRequestHeader(name, value);
            });

            if (request.signal) {
                request.signal.addEventListener("abort", abortXhr);

                xhr.onreadystatechange = function () {
                    // DONE (success or failure)
                    if (xhr.readyState === 4) {
                        request.signal.removeEventListener("abort", abortXhr);
                    }
                };
            }

            xhr.send(
                typeof request._bodyInit === "undefined" ? null : request._bodyInit
            );
        });
    }

    fetch.polyfill = true;

    exports.Headers = Headers;
    exports.Request = Request;
    exports.Response = Response;
    exports.fetch = fetch;

    Object.defineProperty(exports, "__esModule", { value: true });
})();