| 1 | import { BrowserWindow } from 'electron' |
| 2 | import fs from 'fs' |
| 3 | import path from 'path' |
| 4 | import { pathToFileURL } from 'url' |
| 5 | import log from 'electron-log/main.js' |
| 6 | import type { PPTDatabase } from '../../db/database' |
| 7 | import { FREEZE_PAGE_FOR_EXPORT_SCRIPT } from '../../io/html-pptx/browser-scripts' |
| 8 | import { sleep } from '../utils' |
| 9 | import type { RuntimeLocalFiles } from './local-files' |
| 10 | import type { SessionProjectResolver } from './session-project' |
| 11 | |
| 12 | export type SessionPageFile = { |
| 13 | id: string |
| 14 | pageNumber: number |
| 15 | pageId: string |
| 16 | title: string |
| 17 | htmlPath: string |
| 18 | } |
| 19 | |
| 20 | export type PageExport = { |
| 21 | PRINT_READY_PREFIX: string |
| 22 | EXPORT_PAGE_READY_TIMEOUT_MS: number |
| 23 | EXPORT_CAPTURE_SETTLE_MS: number |
| 24 | resolveSessionPageFiles(sessionId: string): Promise<{ |
| 25 | session: Record<string, unknown> |
| 26 | pages: SessionPageFile[] |
| 27 | projectDir: string |
| 28 | }> |
| 29 | waitForPrintReadySignal(args: { |
| 30 | win: BrowserWindow |
| 31 | pageId: string |
| 32 | timeoutMs: number |
| 33 | }): Promise<{ timedOut: boolean; reportedPageId?: string }> |
| 34 | renderPageToPdfBuffer(args: { |
| 35 | page: SessionPageFile |
| 36 | timeoutMs: number |
| 37 | slideSize: import('@shared/slide-size').SlideSizePreset |
| 38 | }): Promise<{ pngBuffer: Buffer; warning?: string }> |
| 39 | } |
| 40 | |
| 41 | const PRINT_READY_PREFIX = '__PPT_PRINT_READY__' |
| 42 | const EXPORT_PAGE_READY_TIMEOUT_MS = 4000 |
| 43 | const EXPORT_CAPTURE_SETTLE_MS = 120 |
| 44 | |
| 45 | export function createPageExport(args: { |
| 46 | db: PPTDatabase |
| 47 | localFiles: RuntimeLocalFiles |
| 48 | sessionProject: SessionProjectResolver |
| 49 | }): PageExport { |
| 50 | const { db, localFiles, sessionProject } = args |
| 51 | |
| 52 | const resolveSessionPageFiles = async ( |
| 53 | sessionId: string |
| 54 | ): Promise<{ |
| 55 | session: Record<string, unknown> |
| 56 | pages: SessionPageFile[] |
| 57 | projectDir: string |
| 58 | }> => { |
| 59 | const session = await db.getSession(sessionId) |
| 60 | if (!session) throw new Error('Session not found') |
| 61 | const sessionRecord = session as unknown as Record<string, unknown> |
| 62 | const projectDir = await sessionProject.resolveSessionProjectDir(sessionId) |
| 63 | const sessionPages = await db.listSessionPages(sessionId) |
| 64 | if (sessionPages.length === 0) { |
| 65 | throw new Error( |
| 66 | 'session_pages is empty after migration; export path requires session_pages as source of truth' |
| 67 | ) |
| 68 | } |
| 69 | const pages = sessionPages.map((page) => ({ |
| 70 | id: page.id, |
| 71 | pageNumber: page.page_number, |
| 72 | pageId: page.file_slug, |
| 73 | title: page.title, |
| 74 | htmlPath: sessionProject.resolveProjectPageHtmlPath( |
| 75 | projectDir, |
| 76 | page.file_slug, |
| 77 | page.html_path |
| 78 | ) |
| 79 | })) |
| 80 | |
| 81 | const missingPages: string[] = [] |
| 82 | const safePages: SessionPageFile[] = [] |
| 83 | for (const page of pages) { |
| 84 | try { |
| 85 | const safePath = await localFiles.assertPathInAllowedRoots({ |
| 86 | filePath: page.htmlPath, |
| 87 | mode: 'read', |
| 88 | sessionId, |
| 89 | htmlOnly: true |
| 90 | }) |
| 91 | safePages.push({ ...page, htmlPath: safePath }) |
| 92 | } catch { |
| 93 | missingPages.push(page.pageId) |
| 94 | } |
| 95 | } |
| 96 | if (missingPages.length > 0) { |
| 97 | throw new Error(`页面文件缺失：${missingPages.join(', ')}`) |
| 98 | } |
| 99 | return { session: sessionRecord, pages: safePages, projectDir } |
| 100 | } |
| 101 | |
| 102 | const waitForPrintReadySignal = async (args: { |
| 103 | win: BrowserWindow |
| 104 | pageId: string |
| 105 | timeoutMs: number |
| 106 | }): Promise<{ timedOut: boolean; reportedPageId?: string }> => { |
| 107 | const { win, pageId, timeoutMs } = args |
| 108 | return new Promise((resolve) => { |
| 109 | let done = false |
| 110 | let timeoutRef: NodeJS.Timeout | null = null |
| 111 | let closedListenerBound = false |
| 112 | |
| 113 | const finalize = (timedOut: boolean, reportedPageId?: string): void => { |
| 114 | if (done) return |
| 115 | done = true |
| 116 | if (timeoutRef) clearTimeout(timeoutRef) |
| 117 | win.webContents.removeListener('console-message', onConsoleMessage) |
| 118 | if (closedListenerBound) win.removeListener('closed', onClosed) |
| 119 | resolve({ timedOut, reportedPageId }) |
| 120 | } |
| 121 | |
| 122 | const resolveConsoleMessageText = (...rawArgs: unknown[]): string => { |
| 123 | if (rawArgs.length >= 3 && typeof rawArgs[2] === 'string') return rawArgs[2] |
| 124 | const firstArg = rawArgs[0] as |
| 125 | | { message?: unknown; params?: { message?: unknown } } |
| 126 | | undefined |
| 127 | if (firstArg && typeof firstArg === 'object') { |
| 128 | if (typeof firstArg.message === 'string') return firstArg.message |
| 129 | if (firstArg.params && typeof firstArg.params.message === 'string') { |
| 130 | return firstArg.params.message |
| 131 | } |
| 132 | } |
| 133 | return '' |
| 134 | } |
| 135 | |
| 136 | const extractReportedPageId = (message: string): string | null => { |
| 137 | if (typeof message !== 'string') return null |
| 138 | const prefixIndex = message.indexOf(PRINT_READY_PREFIX) |
| 139 | if (prefixIndex < 0) return null |
| 140 | const suffix = message.slice(prefixIndex + PRINT_READY_PREFIX.length) |
| 141 | const colonIndex = suffix.indexOf(':') |
| 142 | if (colonIndex < 0) return null |
| 143 | return suffix.slice(colonIndex + 1).trim() || null |
| 144 | } |
| 145 | |
| 146 | const onConsoleMessage = (...rawArgs: unknown[]): void => { |
| 147 | const reported = extractReportedPageId(resolveConsoleMessageText(...rawArgs)) |
| 148 | if (reported === pageId || reported === 'page-unknown') finalize(false, reported) |
| 149 | } |
| 150 | const onClosed = (): void => finalize(true) |
| 151 | |
| 152 | timeoutRef = setTimeout(() => finalize(true), Math.max(500, timeoutMs)) |
| 153 | win.webContents.on('console-message', onConsoleMessage as (...args: unknown[]) => void) |
| 154 | win.on('closed', onClosed) |
| 155 | closedListenerBound = true |
| 156 | }) |
| 157 | } |
| 158 | |
| 159 | const renderPageToPdfBuffer = async (args: { |
| 160 | page: SessionPageFile |
| 161 | timeoutMs: number |
| 162 | slideSize: import('@shared/slide-size').SlideSizePreset |
| 163 | }): Promise<{ pngBuffer: Buffer; warning?: string }> => { |
| 164 | const { page, timeoutMs, slideSize } = args |
| 165 | const captureWidth = slideSize.width |
| 166 | const captureHeight = slideSize.height |
| 167 | const win = new BrowserWindow({ |
| 168 | show: false, |
| 169 | width: captureWidth, |
| 170 | height: captureHeight, |
| 171 | backgroundColor: '#ffffff', |
| 172 | webPreferences: { |
| 173 | contextIsolation: true, |
| 174 | sandbox: false, |
| 175 | nodeIntegration: false, |
| 176 | backgroundThrottling: false, |
| 177 | offscreen: false |
| 178 | } |
| 179 | }) |
| 180 | |
| 181 | try { |
| 182 | win.webContents.setZoomFactor(1) |
| 183 | win.setContentSize(captureWidth, captureHeight) |
| 184 | const pageUrl = new URL(pathToFileURL(page.htmlPath).toString()) |
| 185 | pageUrl.searchParams.set('fit', 'off') |
| 186 | pageUrl.searchParams.set('print', '1') |
| 187 | pageUrl.searchParams.set('export', '1') |
| 188 | pageUrl.searchParams.set('pageId', page.pageId) |
| 189 | pageUrl.searchParams.set('printTimeoutMs', String(timeoutMs)) |
| 190 | pageUrl.searchParams.set( |
| 191 | '_pptMasterExpected', |
| 192 | fs.existsSync(path.join(path.dirname(page.htmlPath), 'master', 'master.css')) ? '1' : '0' |
| 193 | ) |
| 194 | pageUrl.searchParams.set( |
| 195 | '_pptMasterElementsExpected', |
| 196 | fs.existsSync(path.join(path.dirname(page.htmlPath), 'master', 'master.html')) ? '1' : '0' |
| 197 | ) |
| 198 | pageUrl.searchParams.set('_ts', String(Date.now())) |
| 199 | |
| 200 | const readyWaitPromise = waitForPrintReadySignal({ win, pageId: page.pageId, timeoutMs }) |
| 201 | await win.loadURL(pageUrl.toString()) |
| 202 | await win.webContents.executeJavaScript(FREEZE_PAGE_FOR_EXPORT_SCRIPT, true) |
| 203 | const readyResult = await readyWaitPromise |
| 204 | if (readyResult.timedOut) { |
| 205 | log.warn('[export:pdf] print ready timeout', { |
| 206 | pageId: page.pageId, |
| 207 | htmlPath: page.htmlPath, |
| 208 | timeoutMs |
| 209 | }) |
| 210 | } |
| 211 | await sleep(EXPORT_CAPTURE_SETTLE_MS) |
| 212 | await win.webContents.executeJavaScript(FREEZE_PAGE_FOR_EXPORT_SCRIPT, true) |
| 213 | await sleep(450) |
| 214 | await win.webContents.executeJavaScript(FREEZE_PAGE_FOR_EXPORT_SCRIPT, true) |
| 215 | await sleep(80) |
| 216 | const pngBuffer = (await win.webContents.capturePage({ |
| 217 | x: 0, |
| 218 | y: 0, |
| 219 | width: captureWidth, |
| 220 | height: captureHeight |
| 221 | })).toPNG() |
| 222 | |
| 223 | return { |
| 224 | pngBuffer, |
| 225 | warning: readyResult.timedOut |
| 226 | ? `页面 ${page.pageId} 未收到打印就绪信号，已按当前状态导出` |
| 227 | : undefined |
| 228 | } |
| 229 | } finally { |
| 230 | if (!win.isDestroyed()) win.destroy() |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | return { |
| 235 | PRINT_READY_PREFIX, |
| 236 | EXPORT_PAGE_READY_TIMEOUT_MS, |
| 237 | EXPORT_CAPTURE_SETTLE_MS, |
| 238 | resolveSessionPageFiles, |
| 239 | waitForPrintReadySignal, |
| 240 | renderPageToPdfBuffer |
| 241 | } |
| 242 | } |
| 243 |