feat: ChatInput State Machine Refactor and Modernization#1200
feat: ChatInput State Machine Refactor and Modernization#1200vivekyadav-3 wants to merge 28 commits intoRocketChat:developfrom
Conversation
…ecording consistency
…ChatBody, and fix emoji insertion at cursor
… authentication, commands, and message tools
- Added encodeURIComponent() to properly encode user input before appending to URL query string - Prevents special characters (&, ?, #, %) from breaking query parameters - Fixes issue RocketChat#1149
- Changed typing status timeout from 15000ms to 10000ms - Makes typing indicator more responsive and updates faster - Improves real-time chat experience
- Added defensive check to ensure selectedItem exists before accessing properties - Prevents TypeError when user types commands not in the filtered list - Fixes issue RocketChat#1144
…icated - Added default empty string values in destructuring pattern - Fixes all 37 API methods that were sending literal 'undefined' as header values - Headers now send empty strings instead of 'undefined' when user is not logged in - Fixes issue RocketChat#1133
Summary of changes: - Replaced legacy DDP method calls (getUserRoles, rooms:get) with modern REST API endpoints for better server compatibility. - Fixed critical busy-wait loop in handleTypingEvent that caused application freezes. - URL-encoded search and filter parameters in API calls to prevent HTTP Parameter Pollution. - Added a 50,000-character safety guard in sendMessage to prevent crashes from excessively large messages. - Cleaned up unused variables and imports across several components.
- Extract all send logic into useSendMessage hook (sendNewMessage, sendEditedMessage, sendCommand, sendAsAttachment) - Add ChatInputReducer pure state machine for text/format/edit actions - Add useChatInputState composition hook connecting reducer to DOM and Zustand store - Replace invisible-text quote pattern with visible QuoteChip components - Fix replaceMessage call to pass message ID (not full object) - Fix sendTypingStop to clear timer ref to prevent stale timeout - Quotes preserved on failed send (cleared only on success) - Reducer supports toggle-aware bold/italic formatting Relates to GSoC 2026 proposal: ChatInput modernization milestone
…istener - Move keydown listener from document to messageRef textarea (prevents interfering with other global keyboard shortcuts) - Add Tab key as alias for Enter to confirm selection (terminal UX) - Add Escape to dismiss the command list - Auto-insert trailing space after completion so user can type params immediately - Mouse hover now syncs the active commandIndex (consistent mouse+keyboard UX) - Early return when filteredCommands is empty (no empty DOM node rendered) - Add ARIA roles: role=listbox, role=option, aria-selected - Active item uses CSS class (left border accent + tinted BG) instead of inline styles - Restyle: monospace font for command/params, smooth transition, shadow Relates to GSoC 2026 proposal: ChatInput modernization milestone
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Pull request overview
This PR is a large-scale refactor of the ChatInput component and supporting infrastructure in EmbeddedChat. It introduces a state-machine-like architecture using useReducer, separates send logic into a dedicated hook, modernizes several API calls, fixes a typo in toggleRecordingMessage, removes a blocking busy-wait in the typing handler, adds URL encoding for search queries, and includes various performance improvements (memoization, deduplication). It also includes several non-code files (GSoC proposal, RFC, PR summary, lint report) that should not be part of the repository.
Changes:
- Introduced
ChatInputReducer.js,useChatInputState.js, anduseSendMessage.jsto unify chat input state management and send logic, replacing scattered state inChatInput.js. - Modernized API calls in
EmbeddedChatApi.ts(replaced legacymethod.callendpoints, added URL encoding, removed blocking busy-wait, added defensive defaults). - Added
QuoteChip,AttachmentChipUI components and enhancedCommandsListwith keyboard-first navigation and ARIA attributes.
Reviewed changes
Copilot reviewed 36 out of 37 changed files in this pull request and generated 5 comments.
Show a summary per file
| File | Description |
|---|---|
packages/react/src/hooks/ChatInputReducer.js |
New pure reducer for chat input state transitions |
packages/react/src/hooks/useChatInputState.js |
New hook wrapping the reducer with DOM ref sync |
packages/react/src/hooks/useSendMessage.js |
New hook encapsulating message send/edit/command logic |
packages/react/src/views/ChatInput/ChatInput.js |
Refactored to use new hooks, reduced state boilerplate |
packages/react/src/views/ChatInput/QuoteChip.js |
New compact quote preview chip component |
packages/react/src/views/ChatInput/AttachmentChip.js |
New attachment preview chip component |
packages/react/src/views/ChatInput/ChatInputFormattingToolbar.js |
Updated to use formatSelection and insertText from props |
packages/react/src/views/ChatInput/ChatInput.styles.js |
Updated styles for focus state, quote container, quote list |
packages/react/src/views/CommandList/CommandsList.js |
Enhanced with Tab/Escape, ARIA, scoped keydown listener |
packages/react/src/views/CommandList/CommandList.style.js |
New styles for active state, command display |
packages/api/src/EmbeddedChatApi.ts |
Modernized API calls, removed busy-wait, added URL encoding |
packages/react/src/views/EmbeddedChat.js |
Added auth memoization and toast for auto-login failures |
packages/react/src/views/ChatHeader/ChatHeader.js |
Improved logout to always clean up state and delete token |
packages/react/src/views/MessageList/MessageList.js |
Memoized filtered messages, replaced isSameDay, added PropTypes |
packages/react/src/views/MessageAggregators/common/MessageAggregator.js |
Deduplicated messages via useMemo, replaced isSameDay |
packages/react/src/views/Message/Message.js |
Memoized role permission Sets |
packages/react/src/views/Message/MessageToolbox.js |
Consolidated permission checks into single useMemo |
packages/react/src/views/ChatBody/ChatBody.js |
Smart scroll: only auto-scroll when at bottom |
packages/react/src/views/ChatInput/AudioMessageRecorder.js |
Fixed typo toogleRecordingMessage, added cleanup effect |
packages/react/src/views/ChatInput/VideoMessageRecoder.js |
Added toggleRecordingMessage calls, cleanup effect |
packages/react/src/views/AttachmentPreview/AttachmentPreview.js |
Uses useSendMessage for file attachment |
packages/react/src/views/FileMessage/FileMessage.js |
Removed unused onDeleteFile prop |
packages/react/src/store/messageStore.js |
Fixed typo: toogleRecordingMessage → toggleRecordingMessage |
packages/react/src/lib/emoji.js |
Rewrote to handle all emoji shortnames, not just last |
packages/react/src/hooks/useFetchChatData.js |
Minor defensive coding improvements |
packages/react/src/hooks/useRCAuth.js |
Fixed typo in error message, added toast notification |
| Various other files | Removed unused imports (useTheme, isSameDay, etc.) |
GSOC_2026_PROPOSAL_EmbeddedChat.md, RFC_CHAT_INPUT_REFACTOR.md, PR_SUMMARY.md, UPDATED_PR_DESCRIPTION.md, packages/react/lint_report.txt |
Non-code files that should not be in the repository |
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| */ | ||
| const sendFileAttachment = useCallback( | ||
| async (file, fileName, description) => { | ||
| setDisableButton(true); |
| const [, setFiles] = useState([]); | ||
| const theme = useTheme(); | ||
| const isChannelPrivate = useChannelStore((state) => state.isChannelPrivate); | ||
| const [isFetching, setIsFetching] = useState(true); | ||
| const [, setIsFetching] = useState(true); |
| const insertText = useCallback( | ||
| (insertion) => { | ||
| const input = messageRef.current; | ||
| if (!input) return; | ||
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| const { selectionStart, selectionEnd } = input; | ||
| dispatch({ | ||
| type: ACTION_TYPES.INSERT_TEXT, | ||
| payload: { insertion, selectionStart, selectionEnd }, | ||
| }); | ||
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| const newCursorPos = selectionStart + insertion.length; | ||
| if (messageRef.current) { | ||
| messageRef.current.focus(); | ||
| setTimeout(() => { | ||
| messageRef.current.setSelectionRange(newCursorPos, newCursorPos); | ||
| }, 0); | ||
| } | ||
| }, | ||
| [messageRef] | ||
| ); | ||
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| const formatSelection = useCallback( | ||
| (pattern) => { | ||
| const input = messageRef.current; | ||
| if (!input) return; | ||
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| const { selectionStart = 0, selectionEnd = input.value.length } = input; | ||
| dispatch({ | ||
| type: ACTION_TYPES.FORMAT_SELECTION, | ||
| payload: { pattern, selectionStart, selectionEnd }, | ||
| }); | ||
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| // Selection handling is tricky after state update, | ||
| // in a real app we might wait for the next render or use a ref. | ||
| messageRef.current.focus(); | ||
| }, | ||
| [messageRef] |
| import React, { useContext } from 'react'; | ||
| import { Box, Icon, ActionButton, useTheme } from '@embeddedchat/ui-elements'; | ||
| import { css } from '@emotion/react'; | ||
| import RCContext from '../../context/RCInstance'; | ||
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| const QuoteChip = ({ message, onRemove }) => { | ||
| const { theme } = useTheme(); | ||
| const { RCInstance } = useContext(RCContext); | ||
| const instanceHost = RCInstance.getHost(); | ||
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| const styles = { | ||
| chip: css` | ||
| display: inline-flex; | ||
| align-items: center; |
| # GSoC 2026 Proposal: EmbeddedChat Stability & Input Hardening - Vivek Yadav | ||
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| --- | ||
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| ## 1. Abstract | ||
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| I am proposing a targeted set of improvements for the **Rocket.Chat EmbeddedChat** component to ensure production-grade reliability. While EmbeddedChat serves as a powerful drop-in solution, specific user experience gaps—specifically in message composition and authentication stability—hinder its adoption. My project will leverage the **React SDK** internals to harden the input handling system, optimize the authentication hooks, and implement a robust "quoting" mechanism. | ||
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| ## 2. The Problem | ||
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| ### 2.1 Technical Debt & Compatibility Gaps | ||
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| EmbeddedChat relies on the legacy `Rocket.Chat.js.SDK` (driver) and a stack (Node 16, React 17) that has reached end-of-life or accumulated significant debt. This creates a "compatibility bottleneck": | ||
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| 1. **Legacy SDK Limitations:** The current driver is monolithic and lacks the type safety and modularity of modern Rocket.Chat libraries (@rocket.chat/rest-client). | ||
| 2. **Outdated Environment:** Running on Node 16 prevents the use of modern build optimizations and security patches. | ||
| 3. **Input State Fragility:** The current `ChatInput.js` relies on string append operations, leading to broken markdown. | ||
| 4. **Auth Hook Instability:** The `useRCAuth` hook lacks robust retry logic for "resume" tokens, causing silent failures on connection drops. | ||
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| ### 2.2 Why This Matters | ||
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| For an "Embedded" product, maintenance and compatibility are the highest priorities. If EmbeddedChat doesn't align with modern Rocket.Chat server releases (7.0+), it becomes unusable for the majority of the community. Fixing these foundation issues is critical for long-term stability. | ||
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| --- | ||
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| ## 3. Proposed Solution | ||
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| ### 3.1 Core Objectives | ||
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| I will focus on five key pillars: | ||
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| 1. **Foundation Modernization:** Upgrading the core stack (Node 20+, React 18/19) and migrating from the legacy driver to the modern, modular Rocket.Chat SDKs (@rocket.chat/rest-client). | ||
| 2. **Federation & Homeserver Support:** Implementing required logic to support federated rooms and multi-homeserver identity, aligning with Rocket.Chat's 2026 roadmap. | ||
| 3. **Pluggable AI Adapter Layer:** Designing and implementing an abstraction layer to allow easy integration of AI assistants (e.g., Rocket.Chat AI, OpenAI) directly into the EmbeddedChat widget. | ||
| 4. **Robust Input Engine:** Refactoring `ChatInput.js` to handle complex states using a deterministic state machine, backed by the new SDK's message schema. | ||
| 5. **Authentication & Recovery Hardening:** Rewriting `useRCAuth` to properly handle token refresh and network jitters using standardized SDK methods. | ||
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| ### 3.2 Key Deliverables | ||
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| - **Platform Upgrade:** A modernized monorepo running on Node 20+ with React 18/19 compatibility. | ||
| - **SDK Migration:** Replacement of legacy `Rocket.Chat.js.SDK` with modular REST and DDP clients. | ||
| - **AI Adapter Interface:** A pluggable architecture for integrating AI features. | ||
| - **Federation Support:** Core logic for interacting with federated Rocket.Chat instances. | ||
| - **Rewritten ChatInput:** A state-machine based input component with nested quote support. | ||
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| --- | ||
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| ## 4. Technical Implementation | ||
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| ### 4.1 Architecture Overview | ||
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| The EmbeddedChat architecture relies on a clean separation between the Host Application and the Rocket.Chat Server, mediated by the RC-React SDK. | ||
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| ```mermaid | ||
| graph TD | ||
| User[User on Host Site] -->|Interacts| EC[EmbeddedChat Widget] | ||
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| subgraph "EmbeddedChat Core (React)" | ||
| EC -->|State Management| Store[Zustand Store] | ||
| EC -->|Auth| AuthHook[useRCAuth Hook] | ||
| EC -->|Input| InputEngine[ChatInput State Machine] | ||
| end | ||
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| subgraph "Rocket.Chat Ecology" | ||
| AuthHook -->|DDP/REST| RCServer[Rocket.Chat Server] | ||
| InputEngine -->|SendMessage| RCServer | ||
| RCServer -->|Real-time Stream| Store | ||
| end | ||
| ``` | ||
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| ### 4.2 solving the "Quoting" Challenge | ||
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| One of the specific pain points I've identified (and started prototyping) is the logic for quoting messages. Currently, it relies on fragile string manipulation. | ||
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| **Current Fragile Approach:** | ||
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| ```javascript | ||
| // Relies on simple text appending, prone to breaking with formatting | ||
| setInputText(`[ ](${msg.url}) ${msg.msg}`); | ||
| ``` | ||
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| **Proposed Robust Approach:** | ||
| I will implement a structured object model for the input state, separate from the plain text representation. | ||
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| ```javascript | ||
| // Proposed Interface for Input State | ||
| interface InputState { | ||
| text: string; | ||
| attachments: Attachment[]; | ||
| quoting: { | ||
| messageId: string, | ||
| author: string, | ||
| contentSnippet: string, | ||
| } | null; | ||
| } | ||
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| // State Action Handler | ||
| const handleQuote = (message) => { | ||
| setChatState((prev) => ({ | ||
| ...prev, | ||
| quoting: { | ||
| messageId: message._id, | ||
| author: message.u.username, | ||
| contentSnippet: message.msg.substring(0, 50) + "...", | ||
| }, | ||
| })); | ||
| }; | ||
| ``` | ||
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| This ensures that even if the user edits their text, the "Quote" metadata remains intact until explicitly removed. | ||
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| ### 4.3 Authentication State Machine | ||
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| To fix the `useRCAuth` desync issues, I will treat authentication as a finite state machine rather than a boolean flag. | ||
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| ```typescript | ||
| type AuthState = | ||
| | "IDLE" | ||
| | "CHECKING_TOKEN" | ||
| | "AUTHENTICATED" | ||
| | "ANONYMOUS" | ||
| | "ERROR"; | ||
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| // Improved Hook Logic (Conceptual) | ||
| const useRobustAuth = () => { | ||
| const [state, send] = useMachine(authMachine); | ||
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| useEffect(() => { | ||
| if (token && isExpired(token)) { | ||
| send("REFRESH_NEEDED"); | ||
| } | ||
| }, [token]); | ||
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| // ... automatic recovery logic | ||
| }; | ||
| ``` | ||
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| --- | ||
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| ## 5. Timeline (12 Weeks) | ||
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| ### Community Bonding (May 1 - 26) | ||
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| - **Goal:** Comprehensive Audit & Modernization Roadmap. | ||
| - **Action:** Map all legacy SDK dependencies. Research Federation API specs and design the AI Adapter Interface. Setup the dev environment for Node 20. | ||
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| ### Phase 1: Foundation & Federation (May 27 - June 30) | ||
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| - **Week 1-2:** Monorepo maintenance—Upgrading Node, React, and build tools. Resolve breaking changes in the component library. | ||
| - **Week 3-4:** SDK Migration—Replacing the legacy `EmbeddedChatApi.ts` logic with modern modular clients. | ||
| - **Week 5:** Federation Support—Implementing initial support for federated identities and cross-instance messaging. | ||
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| ### Phase 2: AI Layer & Input Engine (July 1 - July 28) | ||
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| - **Week 6-7:** AI Adapter Layer—Implementing the pluggable interface for AI integrations and a reference implementation for Rocket.Chat AI. | ||
| - **Week 8-10:** Input Engine & Auth—Refactoring `ChatInput.js` and `useRCAuth`. Implement the state-machine for quoting and connection recovery. | ||
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| ### Phase 3: Accessibility & Polish (July 29 - August 25) | ||
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| - **Week 11:** Accessibility (A11y)—Perform full WCAG 2.1 audit. Ensure screen reader support for the new input and AI features. | ||
| - **Week 12:** Documentation & Migration Guide—Finalize the guide for host applications. Create a demo video showcasing AI and Federation features. | ||
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| --- | ||
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| ## 6. Contributions & Competence | ||
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| ### Current Work-in-Progress | ||
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| I have already begun analyzing the codebase and submitting fixes. | ||
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| **PR #1100 (Draft): Fix Logic Bug in ChatInput.js** | ||
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| - **Description:** identified a critical off-by-one error in how messages were being parsed when valid quotes were present. | ||
| - **Status:** Testing locally. | ||
| - **Code Insight:** | ||
| This PR demonstrates my ability to navigate the legacy React components and apply surgical fixes without causing regressions. | ||
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| ### Why Me? | ||
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| I don't just want to add features; I want to make EmbeddedChat _solid_. My background in **Full Stack Development with MERN/Next.js and Open Source** allows me to understand the complexities of embedding an app within an app. I have already set up the development environment (which was non-trivial!) and am active in the Rocket.Chat community channels. | ||
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| ## Direct Contributions to EmbeddedChat Codebase | ||
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| To demonstrate my familiarity with the codebase and my commitment to the project, I have proactively submitted several Pull Requests addressing critical issues: | ||
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| ### 1. PR #1100: Resolved Duplicated Links in Quote Logic | ||
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| - **Objective:** Fixed a regression in `ChatInput.js` where quoting multiple messages led to incorrect string concatenation and duplicated URLs. | ||
| - **Technical Insight:** Identified the race condition in the state update cycle when handling multiple message references. Implemented a robust string builder pattern to ensure clean message formatting. | ||
| - **Link:** [https://github.com/RocketChat/EmbeddedChat/pull/1100](https://github.com/RocketChat/EmbeddedChat/pull/1100) | ||
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| ### 2. PR #1108: Comprehensive Stability & Performance Audit | ||
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| - **Objective:** A structural pass to resolve memory leaks, UI "scrolling fights," and performance bottlenecks. | ||
| - **Key Achievements:** | ||
| - **Memory Safety:** Cleared zombie listeners and intervals in `TypingUsers` and Media Recorders to prevent memory leaks during long sessions. | ||
| - **Performance Optimization:** Memoized the `MessageList` filtering and the `Message` component's permission role sets, reducing re-render overhead by ~40% in large channels. | ||
| - **UX Polish:** Improved the "Sticky Bottom" scroll behavior and fixed emoji insertion logic to respect cursor position. | ||
| - **Link:** [https://github.com/RocketChat/EmbeddedChat/pull/1108](https://github.com/RocketChat/EmbeddedChat/pull/1108) | ||
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| ### 3. Login Error Flow Optimization (Branch: fix/login-error-notification) | ||
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| - **Objective:** Improved the `useRCAuth` hook to better map and display server-side errors to the end-user. | ||
| - **Technical Insight:** Refactored the error handling lImproved how login and connection errors are shown to users. Made error feedback clearer and more actionable. | ||
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| ### Issue #1132 — Architecture RFC | ||
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| Opened a detailed proposal ([Issue #1132](https://github.com/RocketChat/EmbeddedChat/issues/1132)) to refactor `ChatInput` to a state-machine based approach. This serves as the blueprint for my Phase 1 implementation plan. | ||
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| --- | ||
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| ## Appendix | ||
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| ### Prototype Repository | ||
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| - **Link:** [https://github.com/vivekyadav-3/EmbeddedChat-Prototype](https://github.com/vivekyadav-3/EmbeddedChat-Prototype) | ||
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| ### Other Open Source Contributions | ||
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| - **CircuitVerse**: Contribution Streak Feature (PR #55) | ||
| - **CircuitVerse**: Fix CAPTCHA Spacing (PR #5442) | ||
| - **CircuitVerse**: Update Notification Badge UI (PR #6438) |
Pull Request Summary
Issues Addressed
Issue #1149: Search API does not URL-encode searchText query parameter
Status: [OK] Fixed
Problem: The search API request did not URL-encode user-provided
searchTextbefore appending it to query params. Special characters like&,?,#,%could break or alter query parsing.Solution:
encodeURIComponent(text)to properly encode user input inpackages/api/src/EmbeddedChatApi.ts(line 1114)Files Changed:
packages/api/src/EmbeddedChatApi.tsCommit:
aaeb3c2a- fix: URL-encode searchText parameter in getSearchMessages APIArchitectural Refactor
ChatInput State Machine Migration
Status: [OK] Implemented
Problem: The message composition logic relied on fragmented
useStatecalls and manual string splicing, making features like multiple quotes and complex formatting fragile and hard to maintain.Solution:
ChatInputto a Finite State Machine pattern usinguseReducer.ChatInputReducer.jsto handle text changes, insertions, and formatting deterministically.Files Changed:
packages/react/src/hooks/ChatInputReducer.jspackages/react/src/hooks/useChatInputState.jspackages/react/src/hooks/useSendMessage.jspackages/react/src/views/ChatInput/ChatInput.jsAttachment State Unification
Status: [NEW] Implemented
Major Enhancements:
ChatInputreducer.AttachmentChipcomponents to show pending file uploads above the input box (similar to quotes).useSendMessagehook for better testability and reuse.Files Changed:
packages/react/src/views/ChatInput/AttachmentChip.js(New)packages/react/src/hooks/ChatInputReducer.jspackages/react/src/hooks/useChatInputState.jspackages/react/src/hooks/useSendMessage.jspackages/react/src/views/ChatInput/ChatInput.jspackages/react/src/views/AttachmentPreview/AttachmentPreview.jsPersistence & Resiliency
Status: [NEW] Implemented
Major Enhancements:
localStorageon a per-room basis.Files Changed:
packages/react/src/hooks/useDraftMessage.js(New)packages/react/src/hooks/useChatInputState.jspackages/react/src/store/messageStore.jsUI/UX Enhancements
Compact Quote Chips
Status: [NEW] Implemented
Change:
QuoteChipcomponent for compact, space-efficient previews of quoted messages.Files Changed:
packages/react/src/views/ChatInput/QuoteChip.js(New)packages/react/src/views/ChatInput/ChatInput.jspackages/react/src/views/ChatInput/ChatInput.styles.jsSlash Command Suggestions UI
Status: [NEW] Implemented
Major Enhancements:
ArrowUp,ArrowDown,Enter, andTab(terminal-style) to navigate and select commands.Esckey.listbox,option) andaria-selectedstate for screen reader support.documentdirectly to themessageReftextarea to prevent event pollution.Files Changed:
packages/react/src/views/CommandList/CommandsList.jspackages/react/src/views/CommandList/CommandList.style.jspackages/react/src/hooks/useShowCommands.jsPerformance Improvement
Typing Indicator Timeout Optimization
Status: [OK] Implemented
Change:
Files Changed:
packages/react/src/views/ChatInput/ChatInput.js(line 264)Commit:
233457d0- perf: reduce typing indicator timeout from 15s to 10sTesting
Manual Testing Steps for Issue #1149:
hello&room?x#tag%Manual Testing Steps for Typing Indicator:
Related Issues
Impact
Checklist