Added proper alert messages and improved security of import file.

scripts/sessionManager.js

@@ -0,0 +1,187 @@
+const regexp    = /^[a-zA-Z0-9-_]+$/; // Alphanumeric, dash, underscore
+const storage   = browser.storage.local;
+const windowSys = browser.windows;
+
+
+const alertMessage = (type, message) => {
+    let msgTag    = document.getElementById("allertMessage");
+    let text      = document.createTextNode(message);
+    let fontColor = "rgba(255, 255, 255, 1)";
+    let bgColor   = "";
+
+    if (type === "success") {
+        bgColor   = "rgba(72, 125, 25, 1)";
+    } else if (type === "warning") {
+        bgColor   = "rgba(195, 123, 0, 1)";
+    } else if (type === "error") {
+        bgColor   = "rgba(125, 45, 25, 1)";
+    }
+
+    msgTag.style.backgroundColor = bgColor;
+    msgTag.style.color           = fontColor;
+    msgTag.style.display         = "block";
+    msgTag.append(text);
+
+    setTimeout(function () {
+        let msgTag           = document.getElementById("allertMessage");
+        msgTag.innerHTML     = "";
+        msgTag.style.display = "none";
+    }, 3000);
+}
+
+const saveSession = () => {
+    let enteryName = '';
+
+    do {
+        enteryName = prompt("What is this session's name? Allowed: a-z, A-Z, -, _",
+                            new Date().toLocaleString().split(',')[0].replace(/\//g, '-'));
+        if (enteryName == null) break
+    } while (enteryName.search(regexp) == -1);
+
+    if (enteryName) {
+        console.log("Saving session...");
+        windowSys.getAll({ populate: true, windowTypes: ["normal"] }).then((windows) => {
+            let sessionData = {};
+            for (let i = 0; i < windows.length; i++) {
+                let links = [];
+                for (var ii = 0; ii < windows[i].tabs.length; ii++) {
+                    if (!windows[i].tabs[ii].url.includes("about:")) {
+                        links.push(
+                            {"link" : windows[i].tabs[ii].url.trim()}
+                        );
+                    }
+
+                }
+                sessionData["WindowID:" + windows[i].id] = links;
+            }
+            saveToStorage(enteryName, JSON.stringify(sessionData));
+        }).then(() => {
+            if (document.getElementsByName(enteryName).length == 0) {
+                appendToSavedSessionsList(enteryName);
+            }
+        });
+    } else {
+        alertMessage("warning", "Canceled save...");
+    }
+}
+
+const saveToStorage = (name, data) => {
+    storage.set({[name]: data});
+    alertMessage("success", "Saved session...");
+}
+
+const importSession = () => {
+    browser.tabs.create({
+      url: browser.extension.getURL("../pages/import.html"),
+      active: true
+    });
+}
+
+const downloadSession = () => {
+    var dlAnchorElem = document.getElementById('downloadAnchorElem');
+    let id           = selectedItem.innerHTML;
+    fileName         = "session:" + id + ":" +
+                        new Date().toLocaleString().split(',')[0]
+                                                   .replace(/\//g, "-") + ".json";
+
+    storage.get(id).then((storageResults) => {
+        let json    = JSON.parse(storageResults[id]);
+        let dataStr = "data:text/json;charset=utf-8," + encodeURIComponent(JSON.stringify(json));
+        dlAnchorElem.setAttribute("href", dataStr);
+        dlAnchorElem.setAttribute("download", fileName);
+        dlAnchorElem.click();
+    });
+
+}
+
+const deleteFromStorage = () => {
+    let action =  confirm("Do you wish to delete session: " + selectedItem.innerHTML + "?");
+
+    if (action) {
+        storage.remove(selectedItem.innerHTML).then(() => {
+            selectedItem.parentElement.removeChild(selectedItem);
+        });
+        alertMessage("success", "Deleted session successfully...");
+    } else {
+        alertMessage("warning", "Canceled deletion...");
+    }
+}
+
+const editSession = () => {
+    let id      = selectedItem.innerHTML;
+    let newName = '';
+
+    do {
+        newName = prompt("Editing selected session... Allowed: a-z, A-Z, -, _", id);
+        if (newName == null) break
+    } while (newName.search(regexp) == -1);
+
+    if (newName) {
+        storage.get(id).then((storageResults) => {
+            storage.remove(id);
+            json = JSON.parse(storageResults[id]);
+            saveToStorage(newName, JSON.stringify(json));
+        });
+        selectedItem.textContent = newName;
+    } else {
+        alertMessage("warning", "Canceled edit...");
+    }
+}
+
+const loadSession = (id = null) => {
+    console.log("Loading session...");
+    try {
+        storage.get(id).then((storageResults) => {
+            let json = JSON.parse(storageResults[id]);
+            let keys = Object.keys(json);
+
+            browser.windows.getAll().then((windows) => {
+                windowSys.getCurrent({populate: true}).then((currentWindow) => {
+                    // Clear out windows
+                    for (var i = 0; i < windows.length; i++) {
+                        if (currentWindow.id != windows[i].id) {
+                            windowSys.remove(windows[i].id);
+                        }
+                    }
+                }, windows);
+            });
+
+            // Open windows and populate with proper tabs
+            keys.forEach((key) => {
+                let store = json[key];
+                let urls  = [];
+
+                for (var i = 0; i < store.length; i++) {
+                    urls.push(store[i].link);
+                }
+
+                windowSys.create({ url: urls });
+            });
+
+            // Finalize clear out windows
+            windowSys.getCurrent({populate: true}).then((currentWindow) => {
+                windowSys.remove(currentWindow.id);
+            });
+        });
+    } catch (e) { console.log(e); }
+}
+
+const getSavedSessionIDs = () => {
+    console.log("Getting saved sessions...");
+    storage.get(null).then((storageResults) => {
+        let keys = Object.keys(storageResults);
+        for (let key of keys) {
+            appendToSavedSessionsList(key);
+        }
+    });
+}
+
+const appendToSavedSessionsList = (enteryName) => {
+    let liTag = document.createElement("LI");
+    let text  = document.createTextNode(enteryName);
+    liTag.setAttribute("name", enteryName);
+    liTag.append(text);
+    document.getElementById("savedSessions").append(liTag);
+}
+
+getSavedSessionIDs();