/**
* Block editor UUID synchronization for supported block types.
*
* Reads:
* wp.blocks.isUnmodifiedDefaultBlock - identifies Gutenberg's transient default block
* wp.data - block-editor store selectors, dispatch, and subscription
* wp.hooks.addFilter - block-type attribute registration
* window.mwpSfeEditorData.pristineDefaultBlocks - schema-declared transient default block types
*
* Exposes: SFE.BlockEditorUuid
*/
(function() {
'use strict';
window.MWP = window.MWP || {};
window.MWP.SFE = window.MWP.SFE || {};
const SFE = window.MWP.SFE;
SFE.ManagerData = SFE.ManagerData || {};
// Get data from PHP.
const { supportedMap, pristineDefaultBlocks, currentPostId } = window.mwpSfeEditorData || {};
if (!supportedMap || !pristineDefaultBlocks || !currentPostId) {
console.error('FrontEdit Manager: Missing editor data');
return;
}
const supportedBlocks = Object.keys(supportedMap);
const uuidAttr = { type: 'string', default: '' };
const { addFilter } = wp.hooks;
// --- A. Attribute Registration ---
/**
* Register the UUID attrs on supported block types.
*
* @param {Object} settings Gutenberg block settings.
* @param {string} name Block name.
* @returns {Object} Updated block settings.
*/
function addUuidAttribute(settings, name) {
if (supportedBlocks.includes(name)) {
// Hoist UUID attrs to the front of the schema object.
const { mwpSfeUuid: existingUuid, mwpSfeUuidShadow: existingShadow, ...restAttrs } =
settings.attributes || {};
const uuid = existingShadow !== undefined ? existingShadow :
existingUuid !== undefined ? existingUuid :
uuidAttr;
settings.attributes = {
mwpSfeUuid: uuid,
mwpSfeUuidShadow: uuid,
...restAttrs,
};
}
return settings;
}
addFilter('blocks.registerBlockType', 'mwp-sfe/add-uuid-attribute', addUuidAttribute);
// --- B. UUID Management (Strict Format Enforcement) ---
if (!SFE.blockEditorUuidRegistry) { SFE.blockEditorUuidRegistry = {}; }
if (!SFE.blockEditorListOwnershipRegistry) { SFE.blockEditorListOwnershipRegistry = {}; }
/**
* Return the block-editor selector when it is available.
*
* @returns {Object|null} Block editor selector, or null when unavailable.
*/
function getBlockEditorSelect() {
if (!wp?.data?.select) {
return null;
}
return wp.data.select('core/block-editor');
}
/**
* Return the current top-level editor blocks when the store is available.
*
* @returns {Array} Top-level block list.
*/
function getEditorBlocks() {
const select = getBlockEditorSelect();
if (!select || typeof select.getBlocks !== 'function') {
return [];
}
return select.getBlocks() || [];
}
/**
* Return the live client ID registered to a UUID, pruning stale entries.
*
* @param {string} uuid Candidate UUID.
* @returns {string} Live owning client ID, or an empty string.
*/
function getRegisteredClient(uuid) {
const candidate = typeof uuid === 'string' ? uuid.trim() : '';
if (!candidate) {
return '';
}
const registeredClient = SFE.blockEditorUuidRegistry[candidate];
if (!registeredClient) {
return '';
}
const select = getBlockEditorSelect();
if (!select || typeof select.getBlock !== 'function') {
return registeredClient;
}
if (select.getBlock(registeredClient)) {
return registeredClient;
}
delete SFE.blockEditorUuidRegistry[candidate];
return '';
}
/**
* Release a UUID registry entry only when it still belongs to this client.
*
* @param {string} uuid Candidate UUID to release.
* @param {string} clientId Gutenberg client ID expected to own the UUID.
* @returns {void}
*/
function releaseUuidOwnership(uuid, clientId) {
const candidate = typeof uuid === 'string' ? uuid.trim() : '';
if (!candidate) {
return;
}
if (SFE.blockEditorUuidRegistry[candidate] === clientId) {
delete SFE.blockEditorUuidRegistry[candidate];
}
}
/**
* Return true when a block is a nested core/list living under a list item.
*
* @param {string} clientId Gutenberg client ID for the current block.
* @param {string} name Block name.
* @returns {boolean} True when the block must remain non-owning.
*/
function isNonOwningNestedListBlock(clientId, name) {
if (name !== 'core/list') {
return false;
}
const select = getBlockEditorSelect();
if (!select || typeof select.getBlockParents !== 'function' || typeof select.getBlock !== 'function') {
return false;
}
const parentIds = select.getBlockParents(clientId) || [];
return parentIds.some(parentId => select.getBlock(parentId)?.name === 'core/list-item');
}
/**
* Remember the canonical owner UUID associated with a list client ID.
*
* @param {string} clientId Gutenberg client ID.
* @param {string} uuid Canonical owner UUID, or empty to clear.
* @returns {void}
*/
function rememberListOwner(clientId, uuid) {
const ownerUuid = typeof uuid === 'string' ? uuid.trim() : '';
if (!ownerUuid) {
delete SFE.blockEditorListOwnershipRegistry[clientId];
return;
}
SFE.blockEditorListOwnershipRegistry[clientId] = ownerUuid;
}
/**
* Find the owning root list UUID for a nested list block.
*
* @param {string} clientId Gutenberg client ID for the nested list block.
* @returns {string} Root list UUID for adoption, or empty.
*/
function getInheritedListOwnerUuid(clientId) {
const select = getBlockEditorSelect();
if (!select || typeof select.getBlockParents !== 'function' || typeof select.getBlock !== 'function') {
return SFE.blockEditorListOwnershipRegistry[clientId] || '';
}
const parentIds = select.getBlockParents(clientId) || [];
for (const parentId of parentIds) {
const parentBlock = select.getBlock(parentId);
if (!parentBlock || parentBlock.name !== 'core/list') {
continue;
}
const parentAttrs = parentBlock.attributes || {};
const ownerUuid = String(
parentAttrs.mwpSfeUuid
|| parentAttrs.mwpSfeUuidShadow
|| SFE.blockEditorListOwnershipRegistry[parentId]
|| ''
).trim();
if (ownerUuid) {
return ownerUuid;
}
}
return SFE.blockEditorListOwnershipRegistry[clientId] || '';
}
/**
* Return a previously inherited owner UUID when a nested list becomes root.
*
* @param {string} clientId Gutenberg client ID for the current block.
* @param {string} name Block name.
* @returns {string} Adoptable UUID, or empty.
*/
function getPromotedListOwnerUuid(clientId, name) {
if (name !== 'core/list' || isNonOwningNestedListBlock(clientId, name)) {
return '';
}
const ownerUuid = String(SFE.blockEditorListOwnershipRegistry[clientId] || '').trim();
if (!ownerUuid) {
return '';
}
const registeredClient = getRegisteredClient(ownerUuid);
if (registeredClient && registeredClient !== clientId) {
return '';
}
return ownerUuid;
}
/**
* Generate a UUID matching the PHP-side format exactly.
*
* @param {string} elementCode Handler element type code.
* @returns {string} Fresh UUID.
*/
function generateStrictUuid(elementCode) {
const chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
let random = '';
for (let i = 0; i < 16; i++) {
random += chars.charAt(Math.floor(Math.random() * 62));
}
return currentPostId + '-' + elementCode + '-' + random;
}
/**
* Return whether one schema-declared block is Gutenberg's unmodified default
* block and must remain transient until the author changes it.
*
* Gutenberg reuses its unmodified default block as the bottom-of-canvas
* writing surface. Adding a persisted UUID attribute makes that block real
* content, causing the editor to create another default block below it on
* every subsequent click. The eligible block type comes from its PHP schema;
* Gutenberg's generic predicate determines its current state.
*
* @param {Object} block Candidate editor block.
* @returns {boolean} True when UUID assignment must wait for a real edit.
*/
function shouldDeferDefaultBlockUuidAssignment(block) {
const attrs = block?.attributes || {};
return (
Object.prototype.hasOwnProperty.call(pristineDefaultBlocks, block?.name) &&
!String(attrs.mwpSfeUuid || '').trim() &&
!String(attrs.mwpSfeUuidShadow || '').trim() &&
wp.blocks.isUnmodifiedDefaultBlock(block)
);
}
/**
* Queue one attribute update only when the target values actually change.
*
* @param {Object} pendingUpdates Accumulator keyed by client ID.
* @param {Object} block Current block object.
* @param {Object} patch Partial attrs to apply.
* @returns {void}
*/
function queueAttributeUpdate(pendingUpdates, block, patch) {
if (!block?.clientId || !patch || typeof patch !== 'object') {
return;
}
const attrs = block.attributes || {};
const next = pendingUpdates[block.clientId] ? { ...pendingUpdates[block.clientId] } : {};
let changed = false;
Object.keys(patch).forEach(key => {
if (attrs[key] !== patch[key] || next[key] !== patch[key]) {
next[key] = patch[key];
changed = true;
}
});
if (changed) {
pendingUpdates[block.clientId] = next;
}
}
/**
* Apply queued block-attribute updates through the editor store.
*
* @param {Object} pendingUpdates Attr patches keyed by client ID.
* @returns {boolean} True when any update was dispatched.
*/
function applyPendingUpdates(pendingUpdates) {
const clientIds = Object.keys(pendingUpdates);
if (!clientIds.length || !wp?.data?.dispatch) {
return false;
}
const dispatcher = wp.data.dispatch('core/block-editor');
if (!dispatcher || typeof dispatcher.updateBlockAttributes !== 'function') {
return false;
}
clientIds.forEach(clientId => {
// UUID repair must not create its own undo level. The duplicate action
// should be the only persistent history entry; otherwise undo restores
// stale duplicate UUIDs and this reconciler keeps generating new ones.
if (typeof dispatcher.__unstableMarkNextChangeAsNotPersistent === 'function') {
dispatcher.__unstableMarkNextChangeAsNotPersistent();
}
dispatcher.updateBlockAttributes(clientId, pendingUpdates[clientId]);
});
return true;
}
/**
* Reconcile one block and its descendants against the canonical UUID rules.
*
* @param {Object} block Gutenberg block object.
* @param {Object} context Traversal context.
* @param {Object} context.pendingUpdates Pending attr patches keyed by client ID.
* @param {Object} context.seenUuids UUIDs already claimed in this pass.
* @param {Object} context.nextUuidRegistry Registry snapshot being rebuilt.
* @param {Object} context.nextListOwnerRegistry List-owner snapshot being rebuilt.
* @param {string} context.inheritedListOwnerUuid Canonical root-list UUID for descendants.
* @returns {string} Final UUID that descendants should inherit.
*/
function reconcileBlockTreeNode(block, context) {
if (!block || !block.clientId || !block.name) {
return context.inheritedListOwnerUuid || '';
}
const {
pendingUpdates,
seenUuids,
nextUuidRegistry,
nextListOwnerRegistry,
inheritedListOwnerUuid
} = context;
const attrs = block.attributes || {};
const currentUuid = typeof attrs.mwpSfeUuid === 'string' ? attrs.mwpSfeUuid.trim() : '';
const shadowUuid = typeof attrs.mwpSfeUuidShadow === 'string' ? attrs.mwpSfeUuidShadow.trim() : '';
const isSupported = supportedBlocks.includes(block.name);
let resolvedListOwnerUuid = inheritedListOwnerUuid || '';
if (!isSupported) {
(block.innerBlocks || []).forEach(innerBlock => {
reconcileBlockTreeNode(innerBlock, {
pendingUpdates,
seenUuids,
nextUuidRegistry,
nextListOwnerRegistry,
inheritedListOwnerUuid: resolvedListOwnerUuid
});
});
return resolvedListOwnerUuid;
}
const elementCode = supportedMap[block.name];
const expectedPrefix = currentPostId + '-' + elementCode + '-';
const deferDefaultBlockUuidAssignment = shouldDeferDefaultBlockUuidAssignment(block);
let effectiveUuid = currentUuid;
let effectiveShadowUuid = shadowUuid;
if (isNonOwningNestedListBlock(block.clientId, block.name)) {
const inheritedOwner = resolvedListOwnerUuid || getInheritedListOwnerUuid(block.clientId);
if (inheritedOwner) {
rememberListOwner(block.clientId, inheritedOwner);
nextListOwnerRegistry[block.clientId] = inheritedOwner;
}
if (currentUuid || shadowUuid) {
queueAttributeUpdate(pendingUpdates, block, {
mwpSfeUuid: '',
mwpSfeUuidShadow: ''
});
}
(block.innerBlocks || []).forEach(innerBlock => {
reconcileBlockTreeNode(innerBlock, {
pendingUpdates,
seenUuids,
nextUuidRegistry,
nextListOwnerRegistry,
inheritedListOwnerUuid: inheritedOwner
});
});
return inheritedOwner;
}
const promotedListOwnerUuid = getPromotedListOwnerUuid(block.clientId, block.name);
if (!effectiveUuid && !effectiveShadowUuid && promotedListOwnerUuid) {
effectiveUuid = promotedListOwnerUuid;
effectiveShadowUuid = promotedListOwnerUuid;
} else if (!effectiveUuid && !effectiveShadowUuid && !deferDefaultBlockUuidAssignment) {
effectiveUuid = generateStrictUuid(elementCode);
effectiveShadowUuid = effectiveUuid;
} else if (!effectiveUuid && effectiveShadowUuid) {
effectiveUuid = effectiveShadowUuid;
}
if (effectiveUuid && !effectiveUuid.startsWith(expectedPrefix)) {
releaseUuidOwnership(effectiveUuid, block.clientId);
effectiveUuid = generateStrictUuid(elementCode);
effectiveShadowUuid = effectiveUuid;
}
const existingOwnerClientId = effectiveUuid ? (seenUuids[effectiveUuid] || '') : '';
if (effectiveUuid && existingOwnerClientId && existingOwnerClientId !== block.clientId) {
effectiveUuid = generateStrictUuid(elementCode);
effectiveShadowUuid = effectiveUuid;
}
if (effectiveUuid && effectiveShadowUuid !== effectiveUuid) {
effectiveShadowUuid = effectiveUuid;
}
if (effectiveUuid) {
seenUuids[effectiveUuid] = block.clientId;
nextUuidRegistry[effectiveUuid] = block.clientId;
if (block.name === 'core/list') {
resolvedListOwnerUuid = effectiveUuid;
}
}
if (block.name === 'core/list' && resolvedListOwnerUuid) {
rememberListOwner(block.clientId, resolvedListOwnerUuid);
nextListOwnerRegistry[block.clientId] = resolvedListOwnerUuid;
}
if (effectiveUuid !== currentUuid || effectiveShadowUuid !== shadowUuid) {
queueAttributeUpdate(pendingUpdates, block, {
mwpSfeUuid: effectiveUuid,
mwpSfeUuidShadow: effectiveShadowUuid
});
}
(block.innerBlocks || []).forEach(innerBlock => {
reconcileBlockTreeNode(innerBlock, {
pendingUpdates,
seenUuids,
nextUuidRegistry,
nextListOwnerRegistry,
inheritedListOwnerUuid: resolvedListOwnerUuid
});
});
return resolvedListOwnerUuid;
}
/**
* Rebuild UUID ownership from the live editor tree and repair invalid attrs.
*
* @returns {boolean} True when any block attrs were updated.
*/
function reconcileEditorBlockTree() {
const blocks = getEditorBlocks();
if (!blocks.length) {
SFE.blockEditorUuidRegistry = {};
SFE.blockEditorListOwnershipRegistry = {};
return false;
}
const pendingUpdates = {};
const seenUuids = {};
const nextUuidRegistry = {};
const nextListOwnerRegistry = {};
blocks.forEach(block => {
reconcileBlockTreeNode(block, {
pendingUpdates,
seenUuids,
nextUuidRegistry,
nextListOwnerRegistry,
inheritedListOwnerUuid: ''
});
});
SFE.blockEditorUuidRegistry = nextUuidRegistry;
SFE.blockEditorListOwnershipRegistry = nextListOwnerRegistry;
return applyPendingUpdates(pendingUpdates);
}
/**
* Build one lightweight signature for UUID-relevant editor state.
*
* @param {Array} blocks Top-level editor blocks.
* @returns {string} Stable signature string.
*/
function buildUuidStateSignature(blocks) {
const parts = [];
(function walk(nodes) {
(nodes || []).forEach(block => {
if (!block?.clientId || !block?.name) {
return;
}
const attrs = block.attributes || {};
parts.push([
block.clientId,
block.name,
attrs.mwpSfeUuid || '',
attrs.mwpSfeUuidShadow || '',
shouldDeferDefaultBlockUuidAssignment(block) ? 'deferred-default' : ''
].join('|'));
if (block.innerBlocks?.length) {
walk(block.innerBlocks);
}
});
})(blocks);
return parts.join('||');
}
/**
* Start one shared store subscriber for UUID reconciliation.
*
* @returns {void}
*/
function bootUuidReconciler() {
if (!wp?.data?.subscribe) {
return;
}
let isReconciling = false;
let isReconcileScheduled = false;
let lastObservedSignature = '';
/**
* Execute one reconciliation pass against the live editor tree.
*
* @returns {void}
*/
function runReconcile() {
if (isReconciling) {
return;
}
isReconciling = true;
try {
reconcileEditorBlockTree();
lastObservedSignature = buildUuidStateSignature(getEditorBlocks());
} finally {
isReconciling = false;
}
}
/**
* Coalesce rapid store changes into one scheduled reconciliation pass.
*
* @returns {void}
*/
function scheduleReconcile() {
if (isReconcileScheduled) {
return;
}
isReconcileScheduled = true;
window.setTimeout(() => {
isReconcileScheduled = false;
runReconcile();
}, 0);
}
runReconcile();
wp.data.subscribe(() => {
if (isReconciling) {
return;
}
const nextSignature = buildUuidStateSignature(getEditorBlocks());
if (nextSignature === lastObservedSignature) {
return;
}
lastObservedSignature = nextSignature;
scheduleReconcile();
});
}
bootUuidReconciler();
SFE.BlockEditorUuid = {
supportedBlocks,
reconcileEditorBlockTree
};
})();
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The Founding of YouTube A Short History - a2gsolutions.com
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YouTube is one of the most influential platforms in modern media, but its origin story is surprisingly simple: a small team wanted an easier way to share video online. In the early 2000s, uploading and sending video files was slow, formats were inconsistent, and most websites weren’t built for smooth playback. YouTube’s founders focused on removing those barriers—making video sharing as easy as sending a link.
Who Founded YouTube?
YouTube was founded by three former PayPal employees: Chad Hurley , Steve Chen , and Jawed Karim . They combined product thinking, engineering skills, and a clear user goal: create a website where anyone could upload a video and watch it instantly in a browser.
Chad Hurley — product/design focus and early CEO role
Steve Chen — engineering and infrastructure
Jawed Karim — engineering and early concept support
The Problem YouTube Solved
At the time, sharing video often meant emailing huge files or dealing with complicated players and downloads. YouTube made video:
Uploadable by non-experts (simple interface)
Streamable in the browser (no special setup)
Sharable through links and embedding on other sites
Early Growth and the First Video
YouTube launched publicly in 2005. One of the most famous early moments was the first uploaded video, “Me at the zoo,” featuring co-founder Jawed Karim. The clip was short and casual—exactly the kind of everyday content that proved the platform’s big idea: ordinary people could publish video without needing a studio.
Key Milestones Timeline
Year/Date
Milestone
Why It Mattered
2005
YouTube is founded and launches
Introduced easy browser-based video sharing
2005
“Me at the zoo” is uploaded
Became a symbol of user-generated video culture
2006
Google acquires YouTube
Provided resources to scale hosting and global reach
Why Google Bought YouTube
By 2006, YouTube’s traffic was exploding. Video hosting is expensive—bandwidth and storage costs rise fast when millions of people watch content daily. Google’s acquisition gave YouTube the infrastructure and advertising ecosystem to grow into a sustainable business.
What YouTube’s Founding Changed
YouTube didn’t just create a popular website; it reshaped how people learn, entertain themselves, and build careers online. Its founding helped accelerate:
Creator-driven media and influencer culture
How-to education and free tutorials at massive scale
Music discovery, commentary, and global community trends
From a small startup idea to a global video powerhouse, YouTube’s founding is a classic example of a simple product solving a real problem—and changing the internet in the process.