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fix(ui): intercept generated-file downloads so failures never wedge the SPA (#243)
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matevip
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@ -15,6 +15,7 @@ import zhCn from 'element-plus/es/locale/lang/zh-cn'
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import { currentLocale } from '@/i18n'
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import { currentLocale } from '@/i18n'
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import { useThemeStore } from '@/stores/useThemeStore'
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import { useThemeStore } from '@/stores/useThemeStore'
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import { useGlobalWikilinkClick } from '@/composables/useGlobalWikilinkClick'
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import { useGlobalWikilinkClick } from '@/composables/useGlobalWikilinkClick'
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import { useGlobalFileDownloadClick } from '@/composables/useGlobalFileDownloadClick'
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import McConfirmHost from '@/components/common/McConfirmHost.vue'
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import McConfirmHost from '@/components/common/McConfirmHost.vue'
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// Initialize theme — applies .dark class to <html> immediately
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// Initialize theme — applies .dark class to <html> immediately
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@ -25,6 +26,12 @@ useThemeStore()
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// clicks (those carry data-slug); this catches everything else.
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// clicks (those carry data-slug); this catches everything else.
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useGlobalWikilinkClick()
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useGlobalWikilinkClick()
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// Global click delegator for tool-generated file download links
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// (`/api/v1/files/...`). Downloads via authenticated fetch → blob so an
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// expired/missing file degrades to a toast instead of a full-page navigation
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// to the backend's 404 JSON, which would otherwise replace the whole SPA.
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useGlobalFileDownloadClick()
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const { t } = useI18n()
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const { t } = useI18n()
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watchEffect(() => {
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watchEffect(() => {
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96
mateclaw-ui/src/composables/useGlobalFileDownloadClick.ts
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96
mateclaw-ui/src/composables/useGlobalFileDownloadClick.ts
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@ -0,0 +1,96 @@
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// Global click delegator for tool-generated file download links.
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//
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// `useMarkdownRenderer.link()` turns a tool-returned download URL such as
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// `[报告.docx](/api/v1/files/generated/<id>)` into a plain same-origin
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// `<a href>`. With no consumer, clicking it lets the browser perform a
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// whole-window navigation to that URL. When the file has expired, was never
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// produced, or the backend restarted, the endpoint answers
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// `404 {"error":"File not found or expired"}` — and because it is a full-page
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// navigation, that JSON *replaces the entire SPA*. In the desktop shell there
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// is no back affordance, so the user is stuck and must restart the app.
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//
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// This composable closes that gap. It intercepts clicks on any same-origin
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// `/api/v1/files/...` anchor and downloads via an authenticated fetch → blob
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// instead of navigating:
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// - success → trigger a transient `<a download>`; the SPA never unmounts.
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// - failure (404 / expired / network) → an inline toast; the user stays in
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// the conversation with the chat intact.
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//
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// Mounted exactly once at app root (see App.vue). Because the root component
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// never unmounts, detaching the listener on unmount is a formality.
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import { onMounted, onBeforeUnmount } from 'vue'
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import { useI18n } from 'vue-i18n'
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import { fetchAuthenticatedBlob } from '@/api/index'
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import { mcToast } from '@/composables/useMcToast'
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// Matches every backend-served file path: in-memory generated files
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// (`/api/v1/files/generated/<id>`) and conversation-scoped media/attachments
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// (`/api/v1/files/...`, `/api/v1/chat/files/...`).
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const FILE_PATH_RE = /^\/api\/v1\/(files|chat\/files)\//
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function filenameFor(anchor: HTMLAnchorElement, pathname: string): string {
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const text = (anchor.textContent || '').trim()
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// The markdown link label is the human filename ("报告.docx"); prefer it
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// when it carries an extension, otherwise fall back to the URL's last segment.
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if (text && /\.[a-z0-9]{1,8}$/i.test(text)) return text
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const seg = decodeURIComponent(pathname.split('/').filter(Boolean).pop() || '')
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return seg || text || 'download'
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}
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export function useGlobalFileDownloadClick() {
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const { t } = useI18n()
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async function handleClick(e: MouseEvent) {
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// Honour modifier-clicks (open in new tab / window) and non-primary buttons.
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if (e.defaultPrevented || e.button !== 0 || e.metaKey || e.ctrlKey || e.shiftKey || e.altKey) return
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const target = e.target as HTMLElement | null
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if (!target) return
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const anchor = target.closest<HTMLAnchorElement>('a[href]')
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if (!anchor) return
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// Only same-origin file-API links; leave everything else to the browser.
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let url: URL
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try {
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url = new URL(anchor.href, window.location.href)
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} catch {
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return
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}
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if (url.origin !== window.location.origin || !FILE_PATH_RE.test(url.pathname)) return
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// From here the link is ours: never let it become a full-page navigation.
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e.preventDefault()
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e.stopPropagation()
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const name = filenameFor(anchor, url.pathname)
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try {
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const blob = await fetchAuthenticatedBlob(url.href)
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const objectUrl = URL.createObjectURL(blob)
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const a = document.createElement('a')
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a.href = objectUrl
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a.download = name
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document.body.appendChild(a)
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a.click()
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document.body.removeChild(a)
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setTimeout(() => URL.revokeObjectURL(objectUrl), 10000)
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mcToast.success(t('chat.downloadStarted', { name }))
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} catch (err: any) {
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// A cache-miss / expiry surfaces as a non-OK fetch ("Fetch failed: 404").
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const status = /(\d{3})/.exec(err?.message || '')?.[1]
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if (status === '404' || status === '410') {
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mcToast.error(t('chat.downloadExpired'))
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} else {
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mcToast.error(t('chat.downloadFailed', { reason: err?.message || 'unknown' }))
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}
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}
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}
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onMounted(() => {
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// Capture phase so we intercept before any descendant handler, and before
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// the browser's default navigation on the anchor.
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document.addEventListener('click', handleClick, { capture: true })
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})
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onBeforeUnmount(() => {
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document.removeEventListener('click', handleClick, { capture: true })
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})
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}
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@ -158,6 +158,9 @@ export default {
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},
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},
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copy: 'Copy',
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copy: 'Copy',
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copied: 'Copied',
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copied: 'Copied',
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downloadStarted: 'Downloading: {name}',
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downloadExpired: 'This file has expired or is no longer available. Ask the assistant to generate it again, then download.',
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downloadFailed: 'Download failed: {reason}',
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regenerate: 'Regenerate',
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regenerate: 'Regenerate',
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replyModel: 'Reply model: {model}',
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replyModel: 'Reply model: {model}',
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routing: {
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routing: {
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@ -158,6 +158,9 @@ export default {
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},
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},
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copy: '复制',
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copy: '复制',
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copied: '已复制',
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copied: '已复制',
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downloadStarted: '开始下载：{name}',
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downloadExpired: '文件已失效或过期，请重新让助手生成后再下载',
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downloadFailed: '下载失败：{reason}',
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regenerate: '重新生成',
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regenerate: '重新生成',
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replyModel: '本条回复模型: {model}',
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replyModel: '本条回复模型: {model}',
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routing: {
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routing: {
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