☰

Greasy Fork is available in English.

hookFetch

only hookFetch

Fra og med 06.05.2023. Se den nyeste version.

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://update.greatest.deepsurf.us/scripts/465483/1186429/hookFetch.js 

(() => {
    var contextWindow = window.unsafeWindow || document.defaultView || window;
    if (contextWindow['__hookRequest__'] != null) {
        return;
    }
    var globalVariable = new Map();
    var FetchMapList = new Map();
    
    function deliveryTask(callbackList, _object, period) {
        let newObject = _object;
        for (let i = 0; i < callbackList.length; i++) {
            let tempObject = null;
            try {
                tempObject = callbackList[i](newObject, period);
            } catch (e) {
                new Error(e);
            }
            if (tempObject == null) {
                continue;
            }
            newObject = tempObject;
        }
        return newObject;
    }

    function hookFetch() {
        const originalFetch = contextWindow.fetch;
        globalVariable.set('Fetch', originalFetch);
        contextWindow.fetch = (...args) => {
            let U = args[0];
            if (U.indexOf('http') == -1) {
                if (U[0] !== '/') {
                    let pathname = new URL(location.href).pathname;
                    U = pathname + U;
                }
                U = location.origin + U;
            }
            let apply = null;
            (() => {
                let url = new URL(U),
                    pathname = url.pathname,
                    callback = FetchMapList.get(pathname);
                if (callback == null) return;
                if (callback.length === 0) return;
                let newObject = deliveryTask(callback, { args }, 'preRequest');
                if (newObject && newObject.args) {
                    args = newObject.args;
                }
                apply = originalFetch.apply(this, args);
                apply.then((response) => {
                    let originalGetReader = response.body.getReader;
                    response.body.getReader = function () {
                        let originalReader = originalGetReader.apply(this, arguments);
                        let originalRead = originalReader.read;
                        originalReader.read = function () {
                            return originalRead.apply(this, arguments).then(function (result) {
                                let tempObject = deliveryTask(callback, { result, args }, 'doing');
                                if (tempObject && tempObject.result) {
                                    result = tempObject.result;
                                }
                                return result;
                            });
                        };
                        return originalReader;
                    };
                    let text = response.text,
                        json = response.json;
                    response.text = () => {
                        return text.apply(response).then((text) => {
                            let _object = deliveryTask(callback, { text, args }, 'done');
                            if (_object && _object.text) {
                                text = _object.text;
                            }
                            return text;
                        });
                    };
                    response.json = () => {
                        return json.apply(response).then((json) => {
                            let text = JSON.stringify(json);
                            let _object = deliveryTask(callback, { text, args }, 'done');
                            if (_object && _object.text) {
                                text = _object.text;
                                return JSON.parse(text);
                            }
                            return json;
                        });
                    };
                });
            })();
            if (apply == null) {
                apply = originalFetch.apply(this, args);
            }
            return apply;
        };
    }

    hookFetch();

    contextWindow['__hookRequest__'] = {
        FetchCallback: {
            add: (pathname, callback) => {
                let list = FetchMapList.get(pathname) || (FetchMapList.set(pathname, []), FetchMapList.get(pathname));
                list.push(callback);
                let index = list.length;
                return index;
            },
            del: (pathname, index) => {
                try {
                    let list = FetchMapList.get(pathname);
                    if (list == null) return false;
                    list.splice(index - 1, 1);
                } catch (e) {
                    new Error(e);
                    return false;
                }
                return true;
            }
        },
        globalVariable: {
            get: (key) => {
                return globalVariable.get(key);
            },
            getAll: () => {
                return globalVariable.entries();
            },
            set: (key, value) => {
                globalVariable.set(key, value);
            },
            getOrDrfault: (key, defaultValue) => {
                return globalVariable.get(key) || defaultValue;
            }
        }
    };
})();