mirror of
https://github.com/DayuanJiang/next-ai-draw-io.git
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dayuan.jiang
b4c34c9361
requestExport(request, timeoutMs) runs one draw.io export with the request's own parameters (a PNG's pageId and width) and resolves with its answer (data, or xml for format "xml"); null when draw.io does not answer. showTransient(xml) puts a document on the canvas for an export only: it is not recorded, its autosaves are ignored, and the next loadDiagram brings the user back to the page they were on. The MCP's canvas shell answers the server's export requests with both.
616 lines
22 KiB
TypeScript
616 lines
22 KiB
TypeScript
"use client"
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import type React from "react"
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import {
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createContext,
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useCallback,
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useContext,
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useEffect,
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useRef,
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useState,
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} from "react"
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import { toast } from "sonner"
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import type {
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DrawioExportEvent,
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DrawioFrameHandle,
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} from "@/components/canvas/drawio-frame"
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import type { ExportFormat } from "@/components/save-dialog"
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import { getApiEndpoint } from "@/lib/base-path"
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import { withPageDefaults } from "@/lib/drawio/drawio-config"
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import {
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canReplaceDiagram,
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commitDiagram,
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previewDiagram,
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resetPreview,
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revertPreview,
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selectPage,
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} from "@/lib/drawio/editor-bridge"
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import {
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BLANK_MXFILE,
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normalizeToMxfile,
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} from "@/packages/mcp-server/src/pages.ts"
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import { validateAndFixXml } from "@/packages/mcp-server/src/xml-validation.ts"
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import { useCanvasStore } from "@/stores/canvas-store"
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import { extractDiagramXML, isRealDiagram } from "../lib/utils"
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/**
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* How a diagram reaches the canvas:
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* - load: replace the whole document and reset undo (sessions, new chat)
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* - preview: streaming AI output, not recorded in undo history
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* - commit: final AI result, one undo step; reported to commit listeners
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* - revert: drop the streaming preview and go back to the given diagram
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*
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* preview/commit/revert go through the draw.io editor when it is reachable
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* (same origin); otherwise they fall back to a full load.
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*/
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export type LoadMode = "load" | "preview" | "commit" | "revert"
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/** The document without where its view was scrolled to (dx, dy) */
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function withoutView(xml: string): string {
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return xml.replace(/<mxGraphModel\b[^>]*>/g, (tag) =>
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tag.replace(/\s(?:dx|dy)="[^"]*"/g, ""),
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)
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}
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export interface DiagramCommit {
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beforeXml: string
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afterXml: string
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toolCallId?: string
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/** The page the change was made on; null or absent: the first page */
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pageId?: string | null
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}
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/** An export as draw.io's export action takes it: the format, and for PNG
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* its scale, width cap and the page to render (pageId) */
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export interface ExportRequest {
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format: string
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[key: string]: unknown
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}
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/** What draw.io answered: the image (a data URL, or SVG text) in data; for
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* format "xml" the document in xml instead */
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export interface ExportResult {
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data?: string
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xml?: string
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}
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interface DiagramContextType {
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chartXML: string
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// chartXML right away, before the re-render (loadDiagram sets both)
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chartXMLRef: React.MutableRefObject<string>
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latestSvg: string
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loadDiagram: (
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chart: string,
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skipValidation?: boolean,
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mode?: LoadMode,
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meta?: { toolCallId?: string; pageId?: string | null },
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) => string | null
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// Returns the export's tag (empty when draw.io is not there yet)
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handleExport: () => string
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// Pending exports by tag; a plain export's resolver gets the XML of the
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// page on screen
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exportResolversRef: React.MutableRefObject<
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Record<string, (data: string, xml?: string) => void>
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>
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drawioRef: React.MutableRefObject<DrawioFrameHandle | null>
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handleDiagramExport: (data: DrawioExportEvent) => void
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handleDiagramAutoSave: (data: { xml?: string }) => void
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clearDiagram: () => void
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saveDiagramToFile: (
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filename: string,
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format: ExportFormat,
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sessionId?: string,
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successMessage?: string,
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) => void
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getThumbnailSvg: () => Promise<string | null>
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getVersionSvg: () => Promise<string | null>
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captureValidationPng: () => Promise<string | null>
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/** One export with its own result; null when draw.io does not answer
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* in time (the MCP shell answers the server's export requests with it) */
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requestExport: (
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request: ExportRequest,
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timeoutMs?: number,
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) => Promise<ExportResult | null>
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/** Show a document for an export only (the MCP's one-page projection of
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* another page): not recorded as the diagram, its autosaves ignored,
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* until the next loadDiagram puts the real document back */
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showTransient: (xml: string) => void
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isDrawioReady: boolean
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onDrawioLoad: () => void
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resetDrawioReady: () => void
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/** Register the handler told about every committed AI change */
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setCommitHandler: (
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handler: ((commit: DiagramCommit) => void) | null,
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) => void
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/** A new user turn starts: forget the streaming base */
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startTurn: () => void
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}
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const DiagramContext = createContext<DiagramContextType | undefined>(undefined)
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// Every export carries a tag in the request's `message` field. draw.io
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// echoes the request back in the export event, so each result reaches its
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// own caller. Tags end in a request number, so a late result never answers
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// a newer request.
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type ExportTag = "thumbnail" | "validation" | "version"
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export function DiagramProvider({ children }: { children: React.ReactNode }) {
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const [chartXML, setChartXML] = useState<string>("")
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const [latestSvg, setLatestSvg] = useState<string>("")
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const [isDrawioReady, setIsDrawioReady] = useState(false)
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const hasCalledOnLoadRef = useRef(false)
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const mountedRef = useRef(true)
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useEffect(() => {
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mountedRef.current = true
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return () => {
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mountedRef.current = false
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}
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}, [])
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const drawioRef = useRef<DrawioFrameHandle | null>(null)
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// Pending exports, keyed by their export tag
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const exportResolversRef = useRef<
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Record<string, (data: string, xml?: string) => void>
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>({})
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const exportSeqRef = useRef(0)
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// Track latest chartXML for restoration after remount
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const chartXMLRef = useRef<string>("")
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// Diagram before the current AI change started streaming
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const turnBaseRef = useRef<string | null>(null)
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// Full loads sent that draw.io has not reported done yet
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const pendingLoadsRef = useRef(0)
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const commitHandlerRef = useRef<((commit: DiagramCommit) => void) | null>(
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null,
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)
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// The page to show again once a full load is done: draw.io shows the
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// first page of a loaded document
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const pageAfterLoadRef = useRef<string | null>(null)
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// A transient document (showTransient) is on the canvas, and the page
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// the user was on before it
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const transientRef = useRef(false)
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const pageBeforeTransientRef = useRef<string | null>(null)
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// Sends a full load. draw.io runs it when its message arrives, and then
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// reports "load": until then the editor shows the diagram from before,
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// so later changes go the same way and keep their order
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const fullLoad = (
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xml: string,
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pageId: string | null = useCanvasStore.getState().currentPageId,
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) => {
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if (!drawioRef.current) return
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pageAfterLoadRef.current =
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pageId && xml.includes(`id="${pageId}"`) ? pageId : null
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pendingLoadsRef.current++
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drawioRef.current.load({ xml })
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}
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const onDrawioLoad = () => {
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pendingLoadsRef.current = Math.max(0, pendingLoadsRef.current - 1)
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// Back to the page the user was on
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const pageId = pageAfterLoadRef.current
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pageAfterLoadRef.current = null
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if (pageId) selectPage(pageId)
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// Only set ready state once to prevent infinite loops
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if (hasCalledOnLoadRef.current) return
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hasCalledOnLoadRef.current = true
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setIsDrawioReady(true)
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// draw.io's first load: loads sent before it went nowhere
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pendingLoadsRef.current = 0
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// Restore diagram after remount (e.g., theme/UI change), or a file
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// opened while draw.io loaded (its page settings count too)
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if (chartXMLRef.current) fullLoad(chartXMLRef.current)
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}
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const resetDrawioReady = () => {
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hasCalledOnLoadRef.current = false
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pendingLoadsRef.current = 0
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setIsDrawioReady(false)
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}
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// Update chartXML and its ref together, so callbacks that read the ref
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// (export handler, autosave) see the new value right away
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const updateChartXML = (xml: string) => {
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chartXMLRef.current = xml
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setChartXML(xml)
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}
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const handleExport = () => {
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if (!drawioRef.current) return ""
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// Export of the current state (for the chat and edit_diagram)
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const tag = `fetch-${++exportSeqRef.current}`
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drawioRef.current.exportDiagram({
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format: "xmlsvg",
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message: tag,
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})
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return tag
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}
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// Export with a tag in `message` (draw.io echoes it back in the export
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// event) and wait for that result. Resolves to null on timeout, which is
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// expected occasionally.
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// (Reads refs only, so it keeps one identity)
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const requestTaggedExport = useCallback(
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(tag: ExportTag, format: "xmlsvg" | "svg" | "png", timeoutMs: number) =>
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new Promise<string | null>((resolve) => {
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const id = `${tag}-${++exportSeqRef.current}`
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const finish = (value: string | null) => {
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clearTimeout(timer)
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delete exportResolversRef.current[id]
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resolve(value)
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}
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const timer = setTimeout(() => finish(null), timeoutMs)
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exportResolversRef.current[id] = finish
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drawioRef.current?.exportDiagram({ format, message: id })
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}),
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[],
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)
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// Get current diagram as SVG for thumbnail (used by session storage).
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// One identity: the chat's auto-save depends on it, and each thumbnail
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// renders this provider again (latestSvg), which would otherwise start
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// the next save
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const getThumbnailSvg = useCallback(async (): Promise<string | null> => {
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if (!drawioRef.current) return null
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// Don't export if diagram is empty
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if (!isRealDiagram(chartXMLRef.current)) return null
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// xmlsvg exports return an SVG data URL
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const svgData = await requestTaggedExport("thumbnail", "xmlsvg", 3000)
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if (svgData?.startsWith("data:image/svg")) {
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// Update latestSvg so it's available for future saves
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setLatestSvg(svgData)
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return svgData
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}
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return null
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}, [requestTaggedExport])
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// Plain SVG (no embedded diagram data) for version cards
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const getVersionSvg = async (): Promise<string | null> => {
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if (!drawioRef.current) return null
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const svgData = await requestTaggedExport("version", "svg", 4000)
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return svgData?.startsWith("data:image/svg") ? svgData : null
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}
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// Capture current diagram as PNG for VLM validation
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const captureValidationPng = async (): Promise<string | null> => {
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if (!drawioRef.current) return null
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// Don't export if diagram is empty
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if (!isRealDiagram(chartXMLRef.current)) return null
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const pngData = await requestTaggedExport("validation", "png", 5000)
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// PNG data should be a base64 data URL
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return pngData?.startsWith("data:image/png") ? pngData : null
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}
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// Like requestTaggedExport, with the request's other parameters (a PNG's
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// page and width) and both parts of the answer
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const requestExport = useCallback(
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(request: ExportRequest, timeoutMs = 10000) =>
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new Promise<ExportResult | null>((resolve) => {
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if (!drawioRef.current) {
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resolve(null)
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return
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}
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const id = `export-${++exportSeqRef.current}`
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const finish = (value: ExportResult | null) => {
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clearTimeout(timer)
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delete exportResolversRef.current[id]
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resolve(value)
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}
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const timer = setTimeout(() => finish(null), timeoutMs)
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exportResolversRef.current[id] = (data, xml) =>
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finish({ data, xml })
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drawioRef.current.exportDiagram({ ...request, message: id })
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}),
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[],
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)
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const showTransient = (xml: string) => {
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if (!transientRef.current) {
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pageBeforeTransientRef.current =
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useCanvasStore.getState().currentPageId
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}
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transientRef.current = true
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fullLoad(xml)
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}
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const loadDiagram = (
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chart: string,
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skipValidation?: boolean,
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mode: LoadMode = "load",
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meta?: { toolCallId?: string; pageId?: string | null },
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): string | null => {
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// The editor bridge is shared: a page that is gone (another language
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// mounted a new one) must not change the new page's canvas
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if (!mountedRef.current) return null
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// A real document ends a transient one; the user goes back to the
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// page they were on before it
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const pageBeforeTransient = transientRef.current
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? pageBeforeTransientRef.current
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: undefined
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transientRef.current = false
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let xmlToLoad = chart
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// Validate XML structure before loading (unless skipped for internal
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// use). Not strict: the XML may hold the user's own diagram, and the
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// tool handlers check model XML strictly before it gets here.
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if (!skipValidation) {
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const validation = validateAndFixXml(chart, { strict: false })
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if (!validation.valid) {
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console.warn(
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"[loadDiagram] Validation error:",
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validation.error,
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)
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return validation.error
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}
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// Use fixed XML if auto-fix was applied
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if (validation.fixed) {
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console.log(
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"[loadDiagram] Auto-fixed XML issues:",
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validation.fixes,
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)
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xmlToLoad = validation.fixed
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}
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}
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xmlToLoad = withPageDefaults(xmlToLoad)
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const previousXml = chartXMLRef.current
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if (mode === "preview" && turnBaseRef.current === null) {
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turnBaseRef.current = previousXml
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}
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const beforeXml = turnBaseRef.current ?? previousXml
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if (mode !== "preview") turnBaseRef.current = null
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// Keep chartXML in sync even when diagrams are injected (e.g., display_diagram tool)
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updateChartXML(xmlToLoad)
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let applied = false
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if (
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mode !== "load" &&
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pendingLoadsRef.current === 0 &&
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canReplaceDiagram(xmlToLoad)
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) {
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try {
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if (mode === "preview") previewDiagram(xmlToLoad)
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else if (mode === "commit") commitDiagram(xmlToLoad)
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else revertPreview(xmlToLoad)
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applied = true
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} catch (error) {
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console.warn("[loadDiagram] Editor update failed:", error)
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}
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}
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if (!applied) {
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// A full load replaces any preview, and its base is stale now
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resetPreview()
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fullLoad(xmlToLoad, pageBeforeTransient)
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}
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if (mode === "commit") {
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commitHandlerRef.current?.({
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beforeXml,
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afterXml: xmlToLoad,
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toolCallId: meta?.toolCallId,
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pageId: meta?.pageId,
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})
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}
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return null
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}
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const startTurn = () => {
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turnBaseRef.current = null
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resetPreview()
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}
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const handleDiagramExport = (data: DrawioExportEvent) => {
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// Thumbnail, version, validation PNG, file save and requestExport
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// exports go only to their own caller
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const tag = data.message?.message
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if (/^(thumbnail|validation|version|save|export)-/.test(tag ?? "")) {
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exportResolversRef.current[tag as string]?.(data.data, data.xml)
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return
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}
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// Don't write chartXML here: exports don't change the diagram, and
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// data.xml from xmlsvg exports has compressed <diagram> payloads that
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// would break edit_diagram/display_diagram. Autosave keeps chartXML
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// up to date with the full uncompressed multi-page document (#879).
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// The chat gets the page the user is viewing (the first one with
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// an external draw.io, which cannot tell us)
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const extractedXML = extractDiagramXML(
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data.data,
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useCanvasStore.getState().currentPageId,
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)
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setLatestSvg(data.data)
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// The chat's own export (onFetchChart), not another one in flight
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const resolve =
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tag !== undefined ? exportResolversRef.current[tag] : undefined
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if (resolve) {
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delete exportResolversRef.current[tag as string]
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resolve(extractedXML)
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}
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}
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// The frame registers this callback once per iframe mount, so it must
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// read refs: state captured in its closure would stay stale after a remount
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const handleDiagramAutoSave = (data: { xml?: string }) => {
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if (!data?.xml) return
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// An edit of a transient document is not the diagram's
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if (transientRef.current) return
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// Don't overwrite a pending restore - if we have a diagram but
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// DrawIO hasn't loaded yet, it means we're waiting to restore
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if (!hasCalledOnLoadRef.current && chartXMLRef.current) return
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// Only the view moved, or draw.io saved what it just loaded: nothing
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// changed, and a save would put a chat that was only opened first
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// in the list
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if (withoutView(data.xml) === withoutView(chartXMLRef.current)) return
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updateChartXML(data.xml)
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}
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const clearDiagram = () => {
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const emptyDiagram = BLANK_MXFILE
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// Skip validation for trusted internal template (loadDiagram also sets chartXML)
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loadDiagram(emptyDiagram, true)
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setLatestSvg("")
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}
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const saveDiagramToFile = (
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filename: string,
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format: ExportFormat,
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sessionId?: string,
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successMessage?: string,
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) => {
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if (!drawioRef.current) {
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console.warn("Draw.io editor not ready")
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return
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}
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// Map format to draw.io export format
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const drawioFormat =
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format === "drawio" || format === "xmlsvg" ? "xmlsvg" : format
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// Each save has its own tag, so two at once never swap results
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const tag = `save-${++exportSeqRef.current}`
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exportResolversRef.current[tag] = (
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exportData: string,
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fullDiagramXML?: string,
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) => {
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delete exportResolversRef.current[tag]
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let fileContent: string | Blob
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let mimeType: string
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let extension: string
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if (format === "drawio") {
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// Prefer the complete document from the export event so all pages are saved.
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const xml = fullDiagramXML?.trim()
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? fullDiagramXML
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: extractDiagramXML(exportData)
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fileContent =
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normalizeToMxfile(xml, {
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|
pageId: "page-1",
|
|
pageName: "Page-1",
|
|
}) ?? xml
|
|
mimeType = "application/xml"
|
|
extension = ".drawio"
|
|
} else if (format === "png") {
|
|
// PNG data comes as base64 data URL
|
|
fileContent = exportData
|
|
mimeType = "image/png"
|
|
extension = ".png"
|
|
} else if (format === "xmlsvg") {
|
|
// Editable SVG: pass data URL directly (like PNG)
|
|
fileContent = exportData
|
|
mimeType = "image/svg+xml"
|
|
extension = ".drawio.svg"
|
|
} else {
|
|
// SVG format (view-only)
|
|
fileContent = exportData
|
|
mimeType = "image/svg+xml"
|
|
extension = ".svg"
|
|
}
|
|
|
|
// Log save event to Langfuse (flags the trace)
|
|
logSaveToLangfuse(filename, format, sessionId)
|
|
|
|
// Handle download
|
|
let url: string
|
|
if (
|
|
typeof fileContent === "string" &&
|
|
fileContent.startsWith("data:")
|
|
) {
|
|
// Already a data URL (PNG)
|
|
url = fileContent
|
|
} else {
|
|
const blob = new Blob([fileContent], { type: mimeType })
|
|
url = URL.createObjectURL(blob)
|
|
}
|
|
|
|
const a = document.createElement("a")
|
|
a.href = url
|
|
a.download = `${filename}${extension}`
|
|
document.body.appendChild(a)
|
|
a.click()
|
|
document.body.removeChild(a)
|
|
|
|
// Show success toast after download is initiated
|
|
if (successMessage) {
|
|
toast.success(successMessage, { duration: 2500 })
|
|
}
|
|
|
|
// Delay URL revocation to ensure download completes
|
|
if (!url.startsWith("data:")) {
|
|
setTimeout(() => URL.revokeObjectURL(url), 100)
|
|
}
|
|
}
|
|
|
|
// Export diagram - callback will be handled in handleDiagramExport
|
|
drawioRef.current.exportDiagram({
|
|
format: drawioFormat,
|
|
message: tag,
|
|
})
|
|
}
|
|
|
|
// Log save event to Langfuse (just flags the trace, doesn't send content)
|
|
const logSaveToLangfuse = async (
|
|
filename: string,
|
|
format: string,
|
|
sessionId?: string,
|
|
) => {
|
|
try {
|
|
await fetch(getApiEndpoint("/api/log-save"), {
|
|
method: "POST",
|
|
headers: { "Content-Type": "application/json" },
|
|
body: JSON.stringify({ filename, format, sessionId }),
|
|
})
|
|
} catch (error) {
|
|
console.warn("Failed to log save to Langfuse:", error)
|
|
}
|
|
}
|
|
|
|
const setCommitHandler = (
|
|
handler: ((commit: DiagramCommit) => void) | null,
|
|
) => {
|
|
commitHandlerRef.current = handler
|
|
}
|
|
|
|
return (
|
|
<DiagramContext.Provider
|
|
value={{
|
|
chartXML,
|
|
chartXMLRef,
|
|
latestSvg,
|
|
loadDiagram,
|
|
handleExport,
|
|
exportResolversRef,
|
|
drawioRef,
|
|
handleDiagramExport,
|
|
handleDiagramAutoSave,
|
|
clearDiagram,
|
|
saveDiagramToFile,
|
|
getThumbnailSvg,
|
|
getVersionSvg,
|
|
captureValidationPng,
|
|
requestExport,
|
|
showTransient,
|
|
isDrawioReady,
|
|
onDrawioLoad,
|
|
resetDrawioReady,
|
|
setCommitHandler,
|
|
startTurn,
|
|
}}
|
|
>
|
|
{children}
|
|
</DiagramContext.Provider>
|
|
)
|
|
}
|
|
|
|
export function useDiagram() {
|
|
const context = useContext(DiagramContext)
|
|
if (context === undefined) {
|
|
throw new Error("useDiagram must be used within a DiagramProvider")
|
|
}
|
|
return context
|
|
}
|