Cloud Subnet Sizing (#11)

* Feature/cloud (#8)

* calc for cloud platforms

* updates after further testing

* remove debugging statements

---------

Co-authored-by: Caesar Kabalan <caesar.kabalan@gmail.com>
Co-authored-by: Byron Collins <byron_collins@hotmail.com>

* refactor cloud subnet sizes based on feedback

* added missing integrity SRI Hashes

* update set_popover_content

* Modify description to highlight  AWS and Azure capabilities.

---------

Co-authored-by: Caesar Kabalan <caesar.kabalan@gmail.com>
Co-authored-by: Byron Collins <byron_collins@hotmail.com>

.gitignore

@@ -1,2 +1,3 @@
 .idea/*
 **/node_modules/*
+**/certs/*

.nvmrc

@@ -1 +1 @@
-v18.16.0
+v20.12.2

README.md

@@ -45,8 +45,59 @@ Compile from source:
 > npm start
 ```
 
+
+
 The full application should then be available within `./dist/`, open `./dist/index.html` in a browser.
 
+### Run with certificates (Optional)
+
+***NB:*** *required for testing clipboard.writeText() in the browser. Feature is only available in secure (https) mode.*
+
+```shell
+
+#Install mkcert
+> brew install mkcert
+# generate CA Certs to be trusted by local browsers
+> mkcert install
+# generate certs for local development
+> cd visualsubnetcalc/src
+# generate certs for local development
+> npm run setup:certs
+# run the local webserver with https
+> npm run local-secure-start
+````
+
+# Cloud Subnet Notes
+
+- [AWS reserves 3 additional IPs](https://docs.aws.amazon.com/vpc/latest/userguide/subnet-sizing.html)
+
+- [Azure reserves 3 additional IPs](https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#are-there-any-restrictions-on-using-ip-addresses-within-these-subnets)
+
+
+## Standard mode:
+   - Smallest subnet: /32
+   - Two reserved addresses per subnet of size <= 30:
+     - Network Address (network + 0)
+     - Broadcast Address (last network address)
+##  AWS mode :
+   - Smallest subnet: /28
+   - Five reserved addresses per subnet:
+     - Network Address (network + 0)
+     - AWS Reserved - VPC Router
+     - AWS Reserved - VPC DNS
+     - AWS Reserved - Future Use
+     - Broadcast Address (last network address)
+## Azure mode :
+   - Smallest subnet: /29
+   - Five reserved addresses per subnet:
+     - Network Address (network + 0)
+     - Azure Reserved - Default Gateway
+     - Azure Reserved - DNS Mapping
+     - Azure Reserved - DNS Mapping
+     - Broadcast Address (last network address)
+
+
+
 ## Credits
 
 Split icon made by [Freepik](https://www.flaticon.com/authors/freepik) from [Flaticon](https://www.flaticon.com/).

dist/css/main.css

@@ -255,3 +255,8 @@
     white-space: nowrap;
     padding-top: 0.25rem;
 }
+
+.active-mode {
+    color: #4091C9;
+    font-weight: bold;
+}

dist/index.html

@@ -6,7 +6,7 @@
     <title>Visual Subnet Calculator - Split/Join</title>
     <link rel="stylesheet" href="css/bootstrap.min.css">
     <link href="css/main.css" rel="stylesheet">
-    <meta name="description" content="Quickly and easily design network layouts. Split and join subnets, add notes and color, then collaborate with others by sharing a custom link to your design.">
+    <meta name="description" content="Quickly and easily design network layouts. Split and join subnets, add notes and color, then collaborate with others by sharing a custom link to your design. Switch to AWS or Azure Mode to calculate compliant subnets for those Cloud Platforms">
     <meta name="robots" content="index, follow" />
     <link rel="apple-touch-icon" sizes="180x180" href="icon/apple-touch-icon.png">
     <link rel="icon" type="image/png" sizes="32x32" href="icon/favicon-32x32.png">
@@ -36,11 +36,10 @@
         <p class="mb-0">Enter the network you wish to subnet and use the Split/Join buttons on the right to start designing!</p>
         <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
     </div>
-
+    <form id="input_form" class="row g-2 mb-3">
-    <form id="input_form" class="row g-2 mb-3" novalidate>
         <div class="font-monospace col-lg-2 col-md-3 col-4">
             <div><label for="network" class="form-label mb-0 ms-1">Network Address</label></div>
-            <div><input id="network" type="text" class="form-control" value="10.0.0.0" aria-label="Network Address" pattern="^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" required></div>
+            <div><input name="network" id="network" type="text" class="form-control" value="10.0.0.0" aria-label="Network Address" pattern="^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" required></div>
         </div>
         <div class="font-monospace col-auto">
             <div style="height:2rem"></div>
@@ -48,7 +47,7 @@
         </div>
         <div class="font-monospace col-lg-2 col-md-3 col-4">
             <div><label for="netsize" class="form-label mb-0 ms-1">Network Size</label></div>
-            <div><input id="netsize" type="text" class="form-control w-10" value="16" aria-label="Network Size" pattern="^(\d|[12]\d|30)$" required></div>
+            <div><input name="netsize" id="netsize" type="text" class="form-control w-10" value="16" aria-label="Network Size" pattern="^([0-9]|[12][0-9]|3[0-2])$" required></div>
         </div>
         <div class="col-lg-2 col-md-3 col-3 font-">
             <div style="height:1.5rem"></div>
@@ -60,6 +59,11 @@
                     </button>
                     <ul class="dropdown-menu">
                         <li><a class="dropdown-item" href="#" data-bs-toggle="modal" data-bs-target="#importExportModal" id="btn_import_export">Import / Export</a></li>
+                        <li><hr class="dropdown-divider"></li>
+                        <li><h6 class="dropdown-header">Mode</h6></li>
+                        <li><a class="dropdown-item active-mode" href="#" data-bs-toggle="operatingMode" data-bs-target="#operatingMode" id="dropdown_standard">Standard</a></li>
+                        <li><a class="dropdown-item" href="#" data-bs-toggle="operatingMode" data-bs-target="#operatingMode" id="dropdown_azure">Azure</a></li>
+                        <li><a class="dropdown-item" href="#" data-bs-toggle="operatingMode" data-bs-target="#operatingMode" id="dropdown_aws">AWS</a></li>
                     </ul>
                 </div>
                 </div>
@@ -67,17 +71,18 @@
     </form>
 
 
+
     <table id="calc" class="table table-bordered font-monospace">
         <thead>
             <tr>
                 <th id="subnetHeader" style="display: table-cell;">Subnet address</th>
                 <th id="netmaskHeader" style="display: none;">Netmask</th>
                 <th id="rangeHeader" style="display: table-cell;">Range of addresses</th>
-                <th id="useableHeader" style="display: table-cell;">Usable IPs</th>
+                <th id="useableHeader" style="display: table-cell;" data-bs-toggle="popover" title="Usable IPs" data-bs-content="This column shows the number of usable IP addresses in each subnet." data-bs-trigger="hover focus" data-bs-placement="top">Usable IPs</th>
                 <th id="hostsHeader" style="display: table-cell;">Hosts</th>
                 <th id="noteHeader" colspan="100%" style="display: table-cell;">
                     Note
-                    <div style="display:inline-block; float:right;"><span class="split">Split</span>/<span class="join">Join</span></div>
+                    <div style="float:right;"><span class="split">Split</span>/<span class="join">Join</span></div>
                 </th>
                 <!--
                 <th id="joinHeader" colspan="100%" style="display: table-cell;"><span class="split">Split</span>/<span class="join">Join</span></th>
@@ -191,14 +196,26 @@
             </div>
         </div>
     </div>
-    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"
-            integrity="sha384-ENjdO4Dr2bkBIFxQpeoTz1HIcje39Wm4jDKdf19U8gI4ddQ3GYNS7NTKfAdVQSZe"
+            integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL"
             crossorigin="anonymous"></script>
     <script src="https://code.jquery.com/jquery-3.7.0.min.js"
             integrity="sha256-2Pmvv0kuTBOenSvLm6bvfBSSHrUJ+3A7x6P5Ebd07/g="
             crossorigin="anonymous"></script>
+    <script src="https://cdn.jsdelivr.net/npm/jquery-validation@1.19.5/dist/jquery.validate.min.js" 
+            integrity="sha384-aEDtD4n2FLrMdE9psop0SHdNyy/W9cBjH22rSRp+3wPHd62Y32uijc0H2eLmgaSn" 
+            crossorigin="anonymous"></script>    
+    <script src="https://cdn.jsdelivr.net/npm/jquery-validation@1.19.5/dist/additional-methods.min.js" 
+            integrity="sha384-kxI94MBt6egf2HqINJ9x8sPSfqxudviPxgttYjlTFaPREJb/gmAOgTr/GYie5ung" 
+            crossorigin="anonymous"></script>
     <script src="js/lz-string.min.js"></script>
     <script src="js/main.js"></script>
+    <script>
+        var popoverTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="popover"]'))
+        var popoverList = popoverTriggerList.map(function (popoverTriggerEl) {
+          return new bootstrap.Popover(popoverTriggerEl)
+        })
+      </script>    
 </div>
 </body>
 </html>

dist/js/main.js

@@ -7,7 +7,7 @@ let infoColumnCount = 5
 //   - Two reserved addresses per subnet of size <= 30:
 //     - Network Address (network + 0)
 //     - Broadcast Address (last network address)
-// AWS mode (future):
+// AWS mode :
 //   - Smallest subnet: /28
 //   - Two reserved addresses per subnet:
 //     - Network Address (network + 0)
@@ -15,17 +15,39 @@ let infoColumnCount = 5
 //     - AWS Reserved - VPC DNS
 //     - AWS Reserved - Future Use
 //     - Broadcast Address (last network address)
-let operatingMode = 'NORMAL'
+// Azure mode :
+//   - Smallest subnet: /29
+//   - Two reserved addresses per subnet:
+//     - Network Address (network + 0)
+//     - Azure Reserved - Default Gateway
+//     - Azure Reserved - DNS Mapping
+//     - Azure Reserved - DNS Mapping
+//     - Broadcast Address (last network address)
 let noteTimeout;
-let minSubnetSize = 32
+let operatingMode = 'Standard'
+let previousOperatingMode = 'Standard'
 let inflightColor = 'NONE'
-let urlVersion = '1'
+let urlVersion = '2'
-let configVersion = '1'
+let configVersion = '2'
+
+const netsizePatterns = {
+    Standard: '^([0-9]|[12][0-9]|3[0-2])$',
+    AZURE: '^([0-9]|[12][0-9])$',
+    AWS: '^([0-9]|[12][0-8])$',
+};
+
+const minSubnetSizes = {
+    Standard: 32,
+    AZURE: 29,
+    AWS: 28,
+};
+
 
 $('input#network,input#netsize').on('input', function() {
     $('#input_form')[0].classList.add('was-validated');
 })
 
+
 $('#color_palette div').on('click', function() {
     // We don't really NEED to convert this to hex, but it's really low overhead to do the
     // conversion here and saves us space in the export/save
@@ -42,9 +64,51 @@ $('#calcbody').on('click', '.row_address, .row_range, .row_usable, .row_hosts, .
 })
 
 $('#btn_go').on('click', function() {
+    $('#input_form').removeClass('was-validated');
+    $('#input_form').validate();
+    if ($('#input_form').valid()) {
+        $('#input_form')[0].classList.add('was-validated');
         reset();
+        // Additional actions upon validation can be added here
+    } else {
+        show_warning_modal('<div>Please correct the errors in the form!</div>');
+    }
+
 })
 
+$('#dropdown_standard').click(function() {
+    previousOperatingMode = operatingMode;
+    operatingMode = 'Standard';
+
+    if(!switchMode(operatingMode)) {
+        operatingMode = previousOperatingMode;
+        $('#dropdown_'+ operatingMode.toLowerCase()).addClass('active-mode');
+    }
+
+});
+
+$('#dropdown_azure').click(function() {
+    previousOperatingMode = operatingMode;
+    operatingMode = 'AZURE';
+
+    if(!switchMode(operatingMode)) {
+        operatingMode = previousOperatingMode;
+        $('#dropdown_'+ operatingMode.toLowerCase()).addClass('active-mode');
+    }
+
+});
+
+$('#dropdown_aws').click(function() {
+    previousOperatingMode = operatingMode;
+    operatingMode = 'AWS';
+
+    if(!switchMode(operatingMode)) {
+        operatingMode = previousOperatingMode;
+        $('#dropdown_'+ operatingMode.toLowerCase()).addClass('active-mode');
+    }
+});
+
+
 $('#importBtn').on('click', function() {
     importConfig(JSON.parse($('#importExportArea').val()))
 })
@@ -73,17 +137,14 @@ $('#bottom_nav #copy_url').on('click', function() {
     }, 2000)
 })
 
-
 $('#btn_import_export').on('click', function() {
     $('#importExportArea').val(JSON.stringify(exportConfig(), null, 2))
 })
 
 function reset() {
-    if (operatingMode === 'AWS') {
+ 
-        minSubnetSize = 28
+    set_popover_content(operatingMode);
-    } else {
+  
-        minSubnetSize = 32
-    }
     let cidrInput = $('#network').val() + '/' + $('#netsize').val()
     let rootNetwork = get_network($('#network').val(), $('#netsize').val())
     let rootCidr = rootNetwork + '/' + $('#netsize').val()
@@ -94,13 +155,13 @@ function reset() {
     subnetMap = {}
     subnetMap[rootCidr] = {}
     maxNetSize = parseInt($('#netsize').val())
-    renderTable();
+    renderTable(operatingMode);
 }
 
 $('#calcbody').on('click', 'td.split,td.join', function(event) {
     // HTML DOM Data elements! Yay! See the `data-*` attributes of the HTML tags
     mutate_subnet_map(this.dataset.mutateVerb, this.dataset.subnet, '')
-    renderTable();
+    renderTable(operatingMode);
 })
 
 $('#calcbody').on('keyup', 'td.note input', function(event) {
@@ -119,18 +180,18 @@ $('#calcbody').on('focusout', 'td.note input', function(event) {
 })
 
 
-function renderTable() {
+function renderTable(operatingMode) {
     // TODO: Validation Code
     $('#calcbody').empty();
     let maxDepth = get_dict_max_depth(subnetMap, 0)
-    addRowTree(subnetMap, 0, maxDepth)
+    addRowTree(subnetMap, 0, maxDepth, operatingMode)
 }
 
-function addRowTree(subnetTree, depth, maxDepth) {
+function addRowTree(subnetTree, depth, maxDepth,operatingMode) {
     for (let mapKey in subnetTree) {
         if (mapKey.startsWith('_')) { continue; }
         if (has_network_sub_keys(subnetTree[mapKey])) {
-            addRowTree(subnetTree[mapKey], depth + 1, maxDepth)
+            addRowTree(subnetTree[mapKey], depth + 1, maxDepth,operatingMode)
         } else {
             let subnet_split = mapKey.split('/')
             let notesWidth = '30%';
@@ -143,12 +204,12 @@ function addRowTree(subnetTree, depth, maxDepth) {
             } else if (maxDepth > 20) {
                 notesWidth = '10%';
             }
-            addRow(subnet_split[0], parseInt(subnet_split[1]), (infoColumnCount + maxDepth - depth), (subnetTree[mapKey]['_note'] || ''), notesWidth, (subnetTree[mapKey]['_color'] || ''))
+            addRow(subnet_split[0], parseInt(subnet_split[1]), (infoColumnCount + maxDepth - depth), (subnetTree[mapKey]['_note'] || ''), notesWidth, (subnetTree[mapKey]['_color'] || ''),operatingMode)
         }
     }
 }
 
-function addRow(network, netSize, colspan, note, notesWidth, color) {
+function addRow(network, netSize, colspan, note, notesWidth, color, operatingMode) {
     let addressFirst = ip2int(network)
     let addressLast = subnet_last_address(addressFirst, netSize)
     let usableFirst = subnet_usable_first(addressFirst, netSize, operatingMode)
@@ -216,7 +277,9 @@ function subnet_usable_first(network, netSize, operatingMode) {
     if (netSize < 31) {
         // https://docs.aws.amazon.com/vpc/latest/userguide/subnet-sizing.html
         // AWS reserves 3 additional IPs
-        return network + (operatingMode === 'AWS' ? 4 : 1);
+        // https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#are-there-any-restrictions-on-using-ip-addresses-within-these-subnets
+        // Azure reserves 3 additional IPs
+        return network + (operatingMode == 'Standard' ? 1 : 4);
     } else {
         return network;
     }
@@ -362,7 +425,7 @@ function mutate_subnet_map(verb, network, subnetTree, propValue = '') {
             let netSplit = mapKey.split('/')
             let netSize = parseInt(netSplit[1])
             if (verb === 'split') {
-                if (netSize < minSubnetSize) {
+                if (netSize < minSubnetSizes[operatingMode]) {
                     let new_networks = split_network(netSplit[0], netSize)
                     // Could maybe optimize this for readability with some null coalescing
                     subnetTree[mapKey][new_networks[0]] = {}
@@ -380,6 +443,16 @@ function mutate_subnet_map(verb, network, subnetTree, propValue = '') {
                         subnetTree[mapKey][new_networks[1]]['_color'] = subnetTree[mapKey]['_color']
                     }
                     delete subnetTree[mapKey]['_color']
+                } else {
+                    switch (operatingMode) {
+                        case 'AWS':
+                        case 'AZURE':
+                            show_warning_modal('<div>Minimum subnet size for ' + operatingMode + ' is ' + minSubnetSizes[operatingMode] + '</div>')
+                            break;
+                        default:
+                            show_warning_modal('<div>Minimum subnet size is ' + minSubnetSizes[operatingMode] + '</div>')
+                            break;
+                    }                                    
                 }
             } else if (verb === 'join') {
                 // Options:
@@ -402,6 +475,112 @@ function mutate_subnet_map(verb, network, subnetTree, propValue = '') {
     }
 }
 
+function switchMode(operatingMode) {
+
+    let isSwitched = true;
+
+    if (subnetMap !== null) {
+        if (validateSubnetSizes(subnetMap, minSubnetSizes[operatingMode])) {
+            
+            renderTable(operatingMode);
+            set_popover_content(operatingMode);
+
+            $('#netsize').attr("pattern",netsizePatterns[operatingMode]);
+            $('#input_form').removeClass('was-validated');
+            $('#input_form').rules("remove", "netsize");   
+
+            switch (operatingMode) {
+                case 'AWS':
+                case 'AZURE':
+                    var message = "("+operatingMode+") Smallest size is " + minSubnetSizes[operatingMode]
+                    break;
+                default:
+                    var message = "Smallest size is " + minSubnetSizes[operatingMode]
+                    break;
+            }
+
+
+            // Modify jquery validation rule
+            $('#input_form #netsize').rules("add", {
+                required: true,
+                pattern: netsizePatterns[operatingMode],
+                messages: {
+                    required: "Please enter a network size",
+                    pattern: message
+                }
+            });
+            // Remove active class from all buttons if needed
+            $('#dropdown_standard, #dropdown_azure, #dropdown_aws').removeClass('active-mode');
+            $('#dropdown_' + operatingMode.toLowerCase()).addClass('active-mode');    
+            isSwitched = true;
+        } else {
+            show_warning_modal('<div>Some subnets have a netmask size smaller than the minimum allowed for ' + operatingMode +'.</div><div>The smallest size allowed is ' + minSubnetSizes[operatingMode] + '</div>');
+            isSwitched = false;
+        }
+    } else {
+        //unlikely to get here.
+        reset();
+    }
+
+    return isSwitched;
+
+
+}
+
+function validateSubnetSizes(subnetMap, minSubnetSize) {
+    let isValid = true;
+    const validate = (subnetTree) => {
+        for (let key in subnetTree) {
+            if (key.startsWith('_')) continue; // Skip special keys
+            let [_, size] = key.split('/');
+            if (parseInt(size) > minSubnetSize) {
+                isValid = false;
+                return; // Early exit if any subnet is invalid
+            }
+            if (typeof subnetTree[key] === 'object') {
+                validate(subnetTree[key]); // Recursively validate subnets
+            }
+        }
+    };
+    validate(subnetMap);
+    return isValid;
+}
+
+
+function set_popover_content(operatingMode) {
+    var popoverContent = "This column shows the number of usable IP addresses in each subnet.";
+    var popoverTitle = "Usable IPs"
+
+    switch (operatingMode) {
+        case 'AWS':
+        case 'AZURE':
+            var popoverTitle = "Usable IPs (" + operatingMode + ")";
+            var popoverContent = "This column shows the number of usable IP addresses in each subnet. " + operatingMode + " reserves 5 IP Addresses"
+            break;
+        default:
+            var popoverContent = "This column shows the number of usable IP addresses in each subnet.";
+            var popoverTitle = "Usable IPs"
+            break;
+    }
+
+    // Ensure the popover is properly disposed
+    $('#useableHeader').popover('dispose');
+
+    // Reinitialize the popover with direct options for title and content
+    $('#useableHeader').popover({
+        trigger: 'hover',
+        html: true,
+        title: function() {
+            // You can compute or fetch the title dynamically here
+            return popoverTitle;
+        },
+        content: function() {
+            // You can compute or fetch the content dynamically here
+            return popoverContent;
+        }
+    });
+
+}
 
 function show_warning_modal(message) {
     var notifyModal = new bootstrap.Modal(document.getElementById("notifyModal"), {});
@@ -410,6 +589,39 @@ function show_warning_modal(message) {
 }
 
 $( document ).ready(function() {
+
+    // Initialize the jQuery Validation on the form
+    var validator = $('#input_form').validate({
+        rules: {
+            network: {
+                required: true,
+                pattern: "^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)"
+            },
+            netsize: {
+                required: true,
+                pattern: "^([0-9]|[12][0-9]|3[0-2])$"
+            }
+        },
+        messages: {
+            network: {
+                required: "Please enter a network",
+                pattern: "Must be a valid IP Address"
+            },
+            netsize: {
+                required: "Please enter a network size",
+                pattern: "Smallest size is 32"
+            }
+        },
+        errorPlacement: function(error, element) {
+            error.insertAfter(element);
+        },
+        // When the form is valid, add the 'was-validated' class
+        submitHandler: function(form) {
+            form.classList.add('was-validated');
+            form.submit(); // Submit the form
+        }
+    });
+
     let autoConfigResult = processConfigUrl();
     if (!autoConfigResult) { 
         reset();
@@ -421,6 +633,7 @@ $( document ).ready(function() {
 function exportConfig() {
     return {
         'config_version': configVersion,
+        'operating_mode': operatingMode,
         'subnets': subnetMap,
     }
 }
@@ -428,6 +641,7 @@ function exportConfig() {
 function getConfigUrl() {
     let defaultExport = JSON.parse(JSON.stringify(exportConfig()));
     renameKey(defaultExport, 'config_version', 'v')
+    renameKey(defaultExport, 'operating_mode', 'm')
     renameKey(defaultExport, 'subnets', 's')
     shortenKeys(defaultExport['s'])
     return '/index.html?c=' + urlVersion + LZString.compressToEncodedURIComponent(JSON.stringify(defaultExport))
@@ -441,14 +655,18 @@ function processConfigUrl() {
         // First character is the version of the URL string, in case the mechanism of encoding changes
         let urlVersion = params['c'].substring(0, 1)
         let urlData = params['c'].substring(1)
-        if (urlVersion === '1') {
         let urlConfig = JSON.parse(LZString.decompressFromEncodedURIComponent(params['c'].substring(1)))
+
+        if (urlVersion === '2') {
+            renameKey(urlConfig, 'm','operating_mode')
+        }
+
         renameKey(urlConfig, 'v', 'config_version')
         renameKey(urlConfig, 's', 'subnets')
         expandKeys(urlConfig['subnets'])
         importConfig(urlConfig)
         return true
-        }
+
     }
 }
 
@@ -500,14 +718,25 @@ function renameKey(obj, oldKey, newKey) {
 }
 
 function importConfig(text) {
-    // TODO: Probably need error checking here
+    switch (text['config_version']) {
-    if (text['config_version'] === '1') {
+        case '1':
+            operatingMode = 'Standard';
+            break;
+        case '2':
+            operatingMode = text['operating_mode'];
+            break;
+        default:
+            // Optionally handle unexpected config_version values
+            show_warning_modal('<div>Invalid operating_mode</div>');
+            reset();
+            break;
+    }
+
     let subnet_split = Object.keys(text['subnets'])[0].split('/')
     $('#network').val(subnet_split[0])
     $('#netsize').val(subnet_split[1])
     subnetMap = text['subnets'];
-        renderTable()
+    switchMode(operatingMode);    
-    }
 }
 
 const rgba2hex = (rgba) => `#${rgba.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+\.{0,1}\d*))?\)$/).slice(1).map((n, i) => (i === 3 ? Math.round(parseFloat(n) * 255) : parseFloat(n)).toString(16).padStart(2, '0').replace('NaN', '')).join('')}`

package-lock.json

@@ -0,0 +1,6 @@
+{
+  "name": "visualsubnetcalc",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}

src/package.json

@@ -1,12 +1,14 @@
 {
 	"dependencies": {
 		"bootstrap": "^5.3.2",
-		"lz-string": "^1.5.0",
+		"http-server": "^14.1.1",
-		"http-server": "^14.1.1"
+		"lz-string": "^1.5.0"
 	},
 	"scripts": {
-		"postinstall": "npm install -g sass",
+		"postinstall": "sudo npm install -g sass",
 		"build": "sass --style compressed scss/custom.scss:../dist/css/bootstrap.min.css && cp node_modules/lz-string/libs/lz-string.min.js ../dist/js/lz-string.min.js",
-		"start": "node node_modules/http-server/bin/http-server ../dist -c-1"
+		"setup:certs": "mkdir -p certs; mkcert -cert-file certs/cert.pem -key-file certs/cert.key localhost 127.0.0.1",
+		"start": "node node_modules/http-server/bin/http-server ../dist -c-1",
+		"local-secure-start": "node node_modules/http-server/bin/http-server ../dist -c-1 -C certs/cert.pem -K certs/cert.key -S -p 8443"
 	}
 }