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openspec/changes/enterprise-message-bridge/proposal.md
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openspec/changes/enterprise-message-bridge/proposal.md
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# OpenSpec Change: enterprise-message-bridge
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- **Change ID**: enterprise-message-bridge
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- **Package**: `@suaveplan/message-bridge`
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- **Category**: universal
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- **Target path**: `universal/social/message-bridge`
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- **Status**: IN PROGRESS
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- **Date**: 2026-04-24
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- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/message-bridge.md`
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---
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## Summary
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Deliver `@suaveplan/message-bridge` on the genesis branch from scratch at enterprise quality. The package provides a unified multi-platform message bridge: a `MessageBridge` facade that normalizes inbound and outbound messages across registered `MessageAdapter` implementations (Slack, Discord, Telegram, iMessage, SMS), a canonical `UnifiedMessage` model, platform-agnostic routing rules, deduplication of inbound messages by message ID, delivery confirmation tracking, and an event bus for inbound message propagation. This package defines the `MessageAdapter` interface that all platform adapters implement. Genesis adds structured errors, Zod schemas, OTel instrumentation, `AbortSignal` cancellation, and property-based tests.
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---
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## Current-state audit (genesis)
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The package does not exist on genesis yet — this is a fresh build.
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---
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## Available workspace deps on genesis
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| Package | Role |
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|---|---|
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| `@suaveplan/error` (`workspace:^`) | `MessageBridgeError`; `MSG_BRIDGE.*` error codes |
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| `@suaveplan/types` (`workspace:^`) | `LoggerLike`, `Clock`, `EventBusLike` |
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| `@suaveplan/events` (`workspace:^`) | Inbound message event propagation |
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| `@suaveplan/retry` (`workspace:^`) | Retry on send failures |
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| `zod` (`catalog:forms`) | Schema validation |
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| `@opentelemetry/api` (`catalog:observability`) | Spans + counters |
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Dev deps: `vitest`, `@vitest/coverage-istanbul`, `fast-check` (all `catalog:testing`).
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---
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## Public API surface
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### `UnifiedMessage`
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```ts
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interface UnifiedMessage {
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id: string
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platform: string // 'slack' | 'discord' | 'telegram' | 'imessage' | 'sms' | custom
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channelId?: string
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threadId?: string
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senderId: string
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senderName?: string
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text: string
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attachments: MessageAttachment[]
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timestamp: Date
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raw?: unknown // original platform payload
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metadata: Record<string, unknown>
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}
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interface MessageAttachment {
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id: string
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type: 'image' | 'video' | 'audio' | 'file'
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url?: string
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content?: Uint8Array
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mimeType?: string
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filename?: string
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size?: number
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}
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interface SendOptions {
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platform: string
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to: string // channel ID, chat ID, or phone number depending on platform
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threadId?: string
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attachments?: MessageAttachment[]
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signal?: AbortSignal
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}
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```
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### `MessageAdapter` interface
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```ts
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interface MessageAdapter {
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readonly platform: string
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start(signal?: AbortSignal): AsyncGenerator<UnifiedMessage>
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send(to: string, text: string, options?: AdapterSendOptions): Promise<void>
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isAvailable(): boolean
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}
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```
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### `MessageBridge`
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```ts
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class MessageBridge {
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constructor(options?: MessageBridgeOptions)
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register(adapter: MessageAdapter): void
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unregister(platform: string): void
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send(options: SendOptions, text: string): Promise<void>
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start(signal?: AbortSignal): void // starts all registered adapters
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stop(): void
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on(event: 'message', handler: (msg: UnifiedMessage) => void): () => void
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platforms(): string[]
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}
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interface MessageBridgeOptions {
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bus?: EventBusLike
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logger?: LoggerLike
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clock?: Clock
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deduplicationWindowMs?: number // default 60_000; 0 disables
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}
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```
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### Routing
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```ts
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interface RouteRule {
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fromPlatform?: string
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toPlatform: string
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transform?: (msg: UnifiedMessage) => Partial<UnifiedMessage>
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}
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function applyRoutes(bridge: MessageBridge, rules: RouteRule[]): () => void
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```
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### Error codes
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```ts
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type MessageBridgeErrorCode =
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| 'MSG_BRIDGE_ADAPTER_NOT_FOUND'
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| 'MSG_BRIDGE_SEND_FAILED'
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| 'MSG_BRIDGE_ADAPTER_UNAVAILABLE'
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| 'MSG_BRIDGE_DEDUP_CONFLICT'
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| 'MSG_BRIDGE_ROUTE_FAILED'
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| 'MSG_BRIDGE_ABORTED'
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```
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---
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## Genesis additions
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1. **`MessageBridgeError`** extends `SuaveplanError` with six stable codes.
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2. **Zod schemas** for `UnifiedMessage`, `MessageAttachment`, `SendOptions`, `RouteRule`, `MessageBridgeOptions`.
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3. **Message deduplication** — a sliding-window set keyed by `${platform}:${id}` prevents duplicate inbound delivery when multiple adapters or polling overlaps produce the same message.
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4. **Routing rules** — `applyRoutes` wires cross-platform message forwarding (e.g. Slack → Telegram bridge) with optional transform.
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5. **OTel instrumentation** — counter `message_bridge.inbound_total` with attribute `message_bridge.platform`; counter `message_bridge.outbound_total`; histogram `message_bridge.send_duration_ms`.
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6. **Property-based tests** — deduplication window correctly excludes duplicates and expires old entries for arbitrary sequences of message IDs.
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---
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## File layout
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```text
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universal/social/message-bridge/
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package.json
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tsconfig.json
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vitest.config.ts
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src/
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index.ts
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error-codes.ts
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constants/
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index.ts
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types/
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common.ts
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common.md
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core/
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message-bridge/
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message-bridge.ts
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message-bridge.md
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message-bridge.types.ts
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message-bridge.test.ts
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index.ts
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deduplicator/
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deduplicator.ts
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deduplicator.md
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deduplicator.test.ts
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index.ts
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routing/
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route-rules/
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route-rules.ts
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route-rules.md
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route-rules.test.ts
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index.ts
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__benchmarks__/
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message-bridge.bench.ts
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tests/
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integration.test.ts
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property.test.ts
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```
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---
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## Impact
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**Downstream consumers**: `@suaveplan/imessage-adapter`, `@suaveplan/slack-client` (adapter registration), `@suaveplan/discord-client`, `@suaveplan/telegram-client`, `@suaveplan/sms-providers`.
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**Note**: This package must be built before the adapter packages since it defines the `MessageAdapter` interface they implement.
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**Workspace dep prerequisites**: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`, `@suaveplan/retry`.
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