Refactor packages to have more idiomatic code base

1 files changed, 748 insertions, 0 deletions

diff --git a/ui/static/js/app.js b/ui/static/js/app.js
new file mode 100644
index 0000000..4ec82e4
--- /dev/null
+++ b/ui/static/js/app.js
@@ -0,0 +1,748 @@
+/*jshint esversion: 6 */
+(function() {
+'use strict';
+
+class DomHelper {
+    static isVisible(element) {
+        return element.offsetParent !== null;
+    }
+
+    static openNewTab(url) {
+        let win = window.open(url, "_blank");
+        win.focus();
+    }
+
+    static scrollPageTo(element) {
+        let windowScrollPosition = window.pageYOffset;
+        let windowHeight = document.documentElement.clientHeight;
+        let viewportPosition = windowScrollPosition + windowHeight;
+        let itemBottomPosition = element.offsetTop + element.offsetHeight;
+
+        if (viewportPosition - itemBottomPosition < 0 || viewportPosition - element.offsetTop > windowHeight) {
+            window.scrollTo(0, element.offsetTop - 10);
+        }
+    }
+
+    static getVisibleElements(selector) {
+        let elements = document.querySelectorAll(selector);
+        let result = [];
+
+        for (let i = 0; i < elements.length; i++) {
+            if (this.isVisible(elements[i])) {
+                result.push(elements[i]);
+            }
+        }
+
+        return result;
+    }
+}
+
+class TouchHandler {
+    constructor() {
+        this.reset();
+    }
+
+    reset() {
+        this.touch = {
+            start: {x: -1, y: -1},
+            move: {x: -1, y: -1},
+            element: null
+        };
+    }
+
+    calculateDistance() {
+        if (this.touch.start.x >= -1 && this.touch.move.x >= -1) {
+            let horizontalDistance = Math.abs(this.touch.move.x - this.touch.start.x);
+            let verticalDistance = Math.abs(this.touch.move.y - this.touch.start.y);
+
+            if (horizontalDistance > 30 && verticalDistance < 70) {
+                return this.touch.move.x - this.touch.start.x;
+            }
+        }
+
+        return 0;
+    }
+
+    findElement(element) {
+        if (element.classList.contains("touch-item")) {
+            return element;
+        }
+
+        for (; element && element !== document; element = element.parentNode) {
+            if (element.classList.contains("touch-item")) {
+                return element;
+            }
+        }
+
+        return null;
+    }
+
+    onTouchStart(event) {
+        if (event.touches === undefined || event.touches.length !== 1) {
+            return;
+        }
+
+        this.reset();
+        this.touch.start.x = event.touches[0].clientX;
+        this.touch.start.y = event.touches[0].clientY;
+        this.touch.element = this.findElement(event.touches[0].target);
+    }
+
+    onTouchMove(event) {
+        if (event.touches === undefined || event.touches.length !== 1 || this.element === null) {
+            return;
+        }
+
+        this.touch.move.x = event.touches[0].clientX;
+        this.touch.move.y = event.touches[0].clientY;
+
+        let distance = this.calculateDistance();
+        let absDistance = Math.abs(distance);
+
+        if (absDistance > 0) {
+            let opacity = 1 - (absDistance > 75 ? 0.9 : absDistance / 75 * 0.9);
+            let tx = distance > 75 ? 75 : (distance < -75 ? -75 : distance);
+
+            this.touch.element.style.opacity = opacity;
+            this.touch.element.style.transform = "translateX(" + tx + "px)";
+        }
+    }
+
+    onTouchEnd(event) {
+        if (event.touches === undefined) {
+            return;
+        }
+
+        if (this.touch.element !== null) {
+            let distance = Math.abs(this.calculateDistance());
+
+            if (distance > 75) {
+                EntryHandler.toggleEntryStatus(this.touch.element);
+                this.touch.element.style.opacity = 1;
+                this.touch.element.style.transform = "none";
+            }
+        }
+
+        this.reset();
+    }
+
+    listen() {
+        let elements = document.querySelectorAll(".touch-item");
+
+        elements.forEach((element) => {
+            element.addEventListener("touchstart", (e) => this.onTouchStart(e), false);
+            element.addEventListener("touchmove", (e) => this.onTouchMove(e), false);
+            element.addEventListener("touchend", (e) => this.onTouchEnd(e), false);
+            element.addEventListener("touchcancel", () => this.reset(), false);
+        });
+    }
+}
+
+class KeyboardHandler {
+    constructor() {
+        this.queue = [];
+        this.shortcuts = {};
+    }
+
+    on(combination, callback) {
+        this.shortcuts[combination] = callback;
+    }
+
+    listen() {
+        document.onkeydown = (event) => {
+            if (this.isEventIgnored(event)) {
+                return;
+            }
+
+            let key = this.getKey(event);
+            this.queue.push(key);
+
+            for (let combination in this.shortcuts) {
+                let keys = combination.split(" ");
+
+                if (keys.every((value, index) => value === this.queue[index])) {
+                    this.queue = [];
+                    this.shortcuts[combination]();
+                    return;
+                }
+
+                if (keys.length === 1 && key === keys[0]) {
+                    this.queue = [];
+                    this.shortcuts[combination]();
+                    return;
+                }
+            }
+
+            if (this.queue.length >= 2) {
+                this.queue = [];
+            }
+        };
+    }
+
+    isEventIgnored(event) {
+        return event.target.tagName === "INPUT" || event.target.tagName === "TEXTAREA";
+    }
+
+    getKey(event) {
+        const mapping = {
+            'Esc': 'Escape',
+            'Up': 'ArrowUp',
+            'Down': 'ArrowDown',
+            'Left': 'ArrowLeft',
+            'Right': 'ArrowRight'
+        };
+
+        for (let key in mapping) {
+            if (mapping.hasOwnProperty(key) && key === event.key) {
+                return mapping[key];
+            }
+        }
+
+        return event.key;
+    }
+}
+
+class FormHandler {
+    static handleSubmitButtons() {
+        let elements = document.querySelectorAll("form");
+        elements.forEach((element) => {
+            element.onsubmit = () => {
+                let button = document.querySelector("button");
+
+                if (button) {
+                    button.innerHTML = button.dataset.labelLoading;
+                    button.disabled = true;
+                }
+            };
+        });
+    }
+}
+
+class MouseHandler {
+    onClick(selector, callback) {
+        let elements = document.querySelectorAll(selector);
+        elements.forEach((element) => {
+            element.onclick = (event) => {
+                event.preventDefault();
+                callback(event);
+            };
+        });
+    }
+}
+
+class RequestBuilder {
+    constructor(url) {
+        this.callback = null;
+        this.url = url;
+        this.options = {
+            method: "POST",
+            cache: "no-cache",
+            credentials: "include",
+            body: null,
+            headers: new Headers({
+                "Content-Type": "application/json",
+                "X-Csrf-Token": this.getCsrfToken()
+            })
+        };
+    }
+
+    withBody(body) {
+        this.options.body = JSON.stringify(body);
+        return this;
+    }
+
+    withCallback(callback) {
+        this.callback = callback;
+        return this;
+    }
+
+    getCsrfToken() {
+        let element = document.querySelector("meta[name=X-CSRF-Token]");
+        if (element !== null) {
+            return element.getAttribute("value");
+        }
+
+        return "";
+    }
+
+    execute() {
+        fetch(new Request(this.url, this.options)).then((response) => {
+            if (this.callback) {
+                this.callback(response);
+            }
+        });
+    }
+}
+
+class UnreadCounterHandler {
+    static decrement(n) {
+        this.updateValue((current) => {
+            return current - n;
+        });
+    }
+
+    static increment(n) {
+        this.updateValue((current) => {
+            return current + n;
+        });
+    }
+
+    static updateValue(callback) {
+        let counterElements = document.querySelectorAll("span.unread-counter");
+        counterElements.forEach((element) => {
+            let oldValue = parseInt(element.textContent, 10);
+            element.innerHTML = callback(oldValue);
+        });
+    }
+}
+
+class EntryHandler {
+    static updateEntriesStatus(entryIDs, status, callback) {
+        let url = document.body.dataset.entriesStatusUrl;
+        let request = new RequestBuilder(url);
+        request.withBody({entry_ids: entryIDs, status: status});
+        request.withCallback(callback);
+        request.execute();
+    }
+
+    static toggleEntryStatus(element) {
+        let entryID = parseInt(element.dataset.id, 10);
+        let statuses = {read: "unread", unread: "read"};
+
+        for (let currentStatus in statuses) {
+            let newStatus = statuses[currentStatus];
+
+            if (element.classList.contains("item-status-" + currentStatus)) {
+                element.classList.remove("item-status-" + currentStatus);
+                element.classList.add("item-status-" + newStatus);
+
+                this.updateEntriesStatus([entryID], newStatus);
+
+                if (newStatus === "read") {
+                    UnreadCounterHandler.decrement(1);
+                } else {
+                    UnreadCounterHandler.increment(1);
+                }
+
+                break;
+            }
+        }
+    }
+
+    static toggleBookmark(element) {
+        element.innerHTML = element.dataset.labelLoading;
+
+        let request = new RequestBuilder(element.dataset.bookmarkUrl);
+        request.withCallback(() => {
+            if (element.dataset.value === "star") {
+                element.innerHTML = element.dataset.labelStar;
+                element.dataset.value = "unstar";
+            } else {
+                element.innerHTML = element.dataset.labelUnstar;
+                element.dataset.value = "star";
+            }
+        });
+        request.execute();
+    }
+
+    static markEntryAsRead(element) {
+        if (element.classList.contains("item-status-unread")) {
+            element.classList.remove("item-status-unread");
+            element.classList.add("item-status-read");
+
+            let entryID = parseInt(element.dataset.id, 10);
+            this.updateEntriesStatus([entryID], "read");
+        }
+    }
+
+    static saveEntry(element) {
+        if (element.dataset.completed) {
+            return;
+        }
+
+        element.innerHTML = element.dataset.labelLoading;
+
+        let request = new RequestBuilder(element.dataset.saveUrl);
+        request.withCallback(() => {
+            element.innerHTML = element.dataset.labelDone;
+            element.dataset.completed = true;
+        });
+        request.execute();
+    }
+
+    static fetchOriginalContent(element) {
+        if (element.dataset.completed) {
+            return;
+        }
+
+        element.innerHTML = element.dataset.labelLoading;
+
+        let request = new RequestBuilder(element.dataset.fetchContentUrl);
+        request.withCallback((response) => {
+            element.innerHTML = element.dataset.labelDone;
+            element.dataset.completed = true;
+
+            response.json().then((data) => {
+                if (data.hasOwnProperty("content")) {
+                    document.querySelector(".entry-content").innerHTML = data.content;
+                }
+            });
+        });
+        request.execute();
+    }
+}
+
+class ConfirmHandler {
+    remove(url) {
+        let request = new RequestBuilder(url);
+        request.withCallback(() => window.location.reload());
+        request.execute();
+    }
+
+    handle(event) {
+        let questionElement = document.createElement("span");
+        let linkElement = event.target;
+        let containerElement = linkElement.parentNode;
+        linkElement.style.display = "none";
+
+        let yesElement = document.createElement("a");
+        yesElement.href = "#";
+        yesElement.appendChild(document.createTextNode(linkElement.dataset.labelYes));
+        yesElement.onclick = (event) => {
+            event.preventDefault();
+
+            let loadingElement = document.createElement("span");
+            loadingElement.className = "loading";
+            loadingElement.appendChild(document.createTextNode(linkElement.dataset.labelLoading));
+
+            questionElement.remove();
+            containerElement.appendChild(loadingElement);
+
+            this.remove(linkElement.dataset.url);
+        };
+
+        let noElement = document.createElement("a");
+        noElement.href = "#";
+        noElement.appendChild(document.createTextNode(linkElement.dataset.labelNo));
+        noElement.onclick = (event) => {
+            event.preventDefault();
+            linkElement.style.display = "inline";
+            questionElement.remove();
+        };
+
+        questionElement.className = "confirm";
+        questionElement.appendChild(document.createTextNode(linkElement.dataset.labelQuestion + " "));
+        questionElement.appendChild(yesElement);
+        questionElement.appendChild(document.createTextNode(", "));
+        questionElement.appendChild(noElement);
+
+        containerElement.appendChild(questionElement);
+    }
+}
+
+class MenuHandler {
+    clickMenuListItem(event) {
+        let element = event.target;
+
+        if (element.tagName === "A") {
+            window.location.href = element.getAttribute("href");
+        } else {
+            window.location.href = element.querySelector("a").getAttribute("href");
+        }
+    }
+
+    toggleMainMenu() {
+        let menu = document.querySelector(".header nav ul");
+        if (DomHelper.isVisible(menu)) {
+            menu.style.display = "none";
+        } else {
+            menu.style.display = "block";
+        }
+    }
+}
+
+class ModalHandler {
+    static exists() {
+        return document.getElementById("modal-container") !== null;
+    }
+
+    static open(fragment) {
+        if (ModalHandler.exists()) {
+            return;
+        }
+
+        let container = document.createElement("div");
+        container.id = "modal-container";
+        container.appendChild(document.importNode(fragment, true));
+        document.body.appendChild(container);
+
+        let closeButton = document.querySelector("a.btn-close-modal");
+        if (closeButton !== null) {
+            closeButton.onclick = (event) => {
+                event.preventDefault();
+                ModalHandler.close();
+            };
+        }
+    }
+
+    static close() {
+        let container = document.getElementById("modal-container");
+        if (container !== null) {
+            container.parentNode.removeChild(container);
+        }
+    }
+}
+
+class NavHandler {
+    showKeyboardShortcuts() {
+        let template = document.getElementById("keyboard-shortcuts");
+        if (template !== null) {
+            ModalHandler.open(template.content);
+        }
+    }
+
+    markPageAsRead() {
+        let items = DomHelper.getVisibleElements(".items .item");
+        let entryIDs = [];
+
+        items.forEach((element) => {
+            element.classList.add("item-status-read");
+            entryIDs.push(parseInt(element.dataset.id, 10));
+        });
+
+        if (entryIDs.length > 0) {
+            EntryHandler.updateEntriesStatus(entryIDs, "read", () => {
+                // This callback make sure the Ajax request reach the server before we reload the page.
+                this.goToPage("next", true);
+            });
+        }
+    }
+
+    saveEntry() {
+        if (this.isListView()) {
+            let currentItem = document.querySelector(".current-item");
+            if (currentItem !== null) {
+                let saveLink = currentItem.querySelector("a[data-save-entry]");
+                if (saveLink) {
+                    EntryHandler.saveEntry(saveLink);
+                }
+            }
+        } else {
+            let saveLink = document.querySelector("a[data-save-entry]");
+            if (saveLink) {
+                EntryHandler.saveEntry(saveLink);
+            }
+        }
+    }
+
+    fetchOriginalContent() {
+        if (! this.isListView()){
+            let link = document.querySelector("a[data-fetch-content-entry]");
+            if (link) {
+                EntryHandler.fetchOriginalContent(link);
+            }
+        }
+    }
+
+    toggleEntryStatus() {
+        let currentItem = document.querySelector(".current-item");
+        if (currentItem !== null) {
+            // The order is important here,
+            // On the unread page, the read item will be hidden.
+            this.goToNextListItem();
+            EntryHandler.toggleEntryStatus(currentItem);
+        }
+    }
+
+    toggleBookmark() {
+        if (! this.isListView()) {
+            this.toggleBookmarkLink(document.querySelector(".entry"));
+            return;
+        }
+
+        let currentItem = document.querySelector(".current-item");
+        if (currentItem !== null) {
+            this.toggleBookmarkLink(currentItem);
+        }
+    }
+
+    toggleBookmarkLink(parent) {
+        let bookmarkLink = parent.querySelector("a[data-toggle-bookmark]");
+        if (bookmarkLink) {
+            EntryHandler.toggleBookmark(bookmarkLink);
+        }
+    }
+
+    openOriginalLink() {
+        let entryLink = document.querySelector(".entry h1 a");
+        if (entryLink !== null) {
+            DomHelper.openNewTab(entryLink.getAttribute("href"));
+            return;
+        }
+
+        let currentItemOriginalLink = document.querySelector(".current-item a[data-original-link]");
+        if (currentItemOriginalLink !== null) {
+            DomHelper.openNewTab(currentItemOriginalLink.getAttribute("href"));
+
+            // Move to the next item and if we are on the unread page mark this item as read.
+            let currentItem = document.querySelector(".current-item");
+            this.goToNextListItem();
+            EntryHandler.markEntryAsRead(currentItem);
+        }
+    }
+
+    openSelectedItem() {
+        let currentItemLink = document.querySelector(".current-item .item-title a");
+        if (currentItemLink !== null) {
+            window.location.href = currentItemLink.getAttribute("href");
+        }
+    }
+
+    /**
+     * @param {string} page Page to redirect to.
+     * @param {boolean} fallbackSelf Refresh actual page if the page is not found.
+     */
+    goToPage(page, fallbackSelf) {
+        let element = document.querySelector("a[data-page=" + page + "]");
+
+        if (element) {
+            document.location.href = element.href;
+        } else if (fallbackSelf) {
+            window.location.reload();
+        }
+    }
+
+    goToPrevious() {
+        if (this.isListView()) {
+            this.goToPreviousListItem();
+        } else {
+            this.goToPage("previous");
+        }
+    }
+
+    goToNext() {
+        if (this.isListView()) {
+            this.goToNextListItem();
+        } else {
+            this.goToPage("next");
+        }
+    }
+
+    goToPreviousListItem() {
+        let items = DomHelper.getVisibleElements(".items .item");
+        if (items.length === 0) {
+            return;
+        }
+
+        if (document.querySelector(".current-item") === null) {
+            items[0].classList.add("current-item");
+            return;
+        }
+
+        for (let i = 0; i < items.length; i++) {
+            if (items[i].classList.contains("current-item")) {
+                items[i].classList.remove("current-item");
+
+                if (i - 1 >= 0) {
+                    items[i - 1].classList.add("current-item");
+                    DomHelper.scrollPageTo(items[i - 1]);
+                }
+
+                break;
+            }
+        }
+    }
+
+    goToNextListItem() {
+        let currentItem = document.querySelector(".current-item");
+        let items = DomHelper.getVisibleElements(".items .item");
+        if (items.length === 0) {
+            return;
+        }
+
+        if (currentItem === null) {
+            items[0].classList.add("current-item");
+            return;
+        }
+
+        for (let i = 0; i < items.length; i++) {
+            if (items[i].classList.contains("current-item")) {
+                items[i].classList.remove("current-item");
+
+                if (i + 1 < items.length) {
+                    items[i + 1].classList.add("current-item");
+                    DomHelper.scrollPageTo(items[i + 1]);
+                }
+
+                break;
+            }
+        }
+    }
+
+    isListView() {
+        return document.querySelector(".items") !== null;
+    }
+}
+
+document.addEventListener("DOMContentLoaded", function() {
+    FormHandler.handleSubmitButtons();
+
+    let touchHandler = new TouchHandler();
+    touchHandler.listen();
+
+    let navHandler = new NavHandler();
+    let keyboardHandler = new KeyboardHandler();
+    keyboardHandler.on("g u", () => navHandler.goToPage("unread"));
+    keyboardHandler.on("g b", () => navHandler.goToPage("starred"));
+    keyboardHandler.on("g h", () => navHandler.goToPage("history"));
+    keyboardHandler.on("g f", () => navHandler.goToPage("feeds"));
+    keyboardHandler.on("g c", () => navHandler.goToPage("categories"));
+    keyboardHandler.on("g s", () => navHandler.goToPage("settings"));
+    keyboardHandler.on("ArrowLeft", () => navHandler.goToPrevious());
+    keyboardHandler.on("ArrowRight", () => navHandler.goToNext());
+    keyboardHandler.on("j", () => navHandler.goToPrevious());
+    keyboardHandler.on("p", () => navHandler.goToPrevious());
+    keyboardHandler.on("k", () => navHandler.goToNext());
+    keyboardHandler.on("n", () => navHandler.goToNext());
+    keyboardHandler.on("h", () => navHandler.goToPage("previous"));
+    keyboardHandler.on("l", () => navHandler.goToPage("next"));
+    keyboardHandler.on("o", () => navHandler.openSelectedItem());
+    keyboardHandler.on("v", () => navHandler.openOriginalLink());
+    keyboardHandler.on("m", () => navHandler.toggleEntryStatus());
+    keyboardHandler.on("A", () => navHandler.markPageAsRead());
+    keyboardHandler.on("s", () => navHandler.saveEntry());
+    keyboardHandler.on("d", () => navHandler.fetchOriginalContent());
+    keyboardHandler.on("f", () => navHandler.toggleBookmark());
+    keyboardHandler.on("?", () => navHandler.showKeyboardShortcuts());
+    keyboardHandler.on("Escape", () => ModalHandler.close());
+    keyboardHandler.listen();
+
+    let mouseHandler = new MouseHandler();
+    mouseHandler.onClick("a[data-save-entry]", (event) => {
+        event.preventDefault();
+        EntryHandler.saveEntry(event.target);
+    });
+
+    mouseHandler.onClick("a[data-toggle-bookmark]", (event) => {
+        event.preventDefault();
+        EntryHandler.toggleBookmark(event.target);
+    });
+
+    mouseHandler.onClick("a[data-fetch-content-entry]", (event) => {
+        event.preventDefault();
+        EntryHandler.fetchOriginalContent(event.target);
+    });
+
+    mouseHandler.onClick("a[data-on-click=markPageAsRead]", () => navHandler.markPageAsRead());
+    mouseHandler.onClick("a[data-confirm]", (event) => {
+        (new ConfirmHandler()).handle(event);
+    });
+
+    if (document.documentElement.clientWidth < 600) {
+        let menuHandler = new MenuHandler();
+        mouseHandler.onClick(".logo", () => menuHandler.toggleMainMenu());
+        mouseHandler.onClick(".header nav li", (event) => menuHandler.clickMenuListItem(event));
+    }
+});
+
+})();