Daniel Legt
3b278642dc
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Implements dynamic Open Graph (OG) metadata and image generation for
single-file shared boxes to improve social media previews.
Changes include:
- Added a new route `/d/{boxID}/f/{fileID}/og-image.jpg` for file-specific OG images.
- Updated `DownloadPage` to dynamically set the page title, description, and OG image properties when a box contains only one file.
- Restricted raw media inline serving for social bots to images and videos.
- Added helper functions to format file share descriptions and determine appropriate social image URLs and types.
- Integrated basic font rendering to support dynamic OG image generation.
717 lines
22 KiB
JavaScript
717 lines
22 KiB
JavaScript
(function () {
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var preview = document.querySelector("[data-source-url][data-file-name][data-content-type]");
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if (!preview) {
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return;
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}
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var SMALL_TEXT_BYTES = 50 * 1024;
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var LARGE_PREVIEW_BYTES = 500 * 1024;
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var state = {
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fileName: preview.dataset.fileName || "",
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contentType: (preview.dataset.contentType || "").toLowerCase(),
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previewKind: preview.dataset.previewKind || "",
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sizeBytes: Number(preview.dataset.sizeBytes || 0),
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sizeLabel: preview.dataset.fileSize || "",
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sourceURL: preview.dataset.sourceUrl || "",
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downloadURL: preview.dataset.downloadUrl || "",
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iconURL: preview.dataset.iconUrl || "",
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activeMode: "",
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defaultMode: "default",
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pendingMode: "",
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textSource: "",
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textLoaded: false,
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rawLoaded: false,
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prismLoaded: false,
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renderLoaded: false,
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renderFullscreenFallback: false,
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confirmedLargeModes: {},
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tabs: []
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};
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var els = {
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tabs: preview.querySelector("[data-preview-tabs]"),
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modeLabel: preview.querySelector("[data-preview-mode-label]"),
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defaultPane: preview.querySelector("[data-default-preview]"),
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imagePane: preview.querySelector("[data-image-preview]"),
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videoPane: preview.querySelector("[data-video-preview]"),
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browserAudioPane: preview.querySelector("[data-browser-audio-preview]"),
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rawPane: preview.querySelector("[data-raw-preview]"),
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rawOutput: preview.querySelector("[data-raw-output]"),
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codePane: preview.querySelector("[data-code-preview]"),
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codeOutput: preview.querySelector("[data-code-output]"),
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renderPane: preview.querySelector("[data-render-preview]"),
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fullscreenButton: preview.querySelector("[data-render-fullscreen]"),
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gatePane: preview.querySelector("[data-large-preview-gate]"),
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gateConfirm: preview.querySelector("[data-large-preview-confirm]"),
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gateCancel: preview.querySelector("[data-large-preview-cancel]"),
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placeholder: preview.querySelector("[data-preview-placeholder]")
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};
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var fileType = detectFileType();
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state.tabs = buildTabs(fileType);
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state.defaultMode = chooseDefaultMode(fileType, state.tabs);
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bindLargeGate();
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bindThemeChanges();
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bindRenderFullscreen();
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renderTabs();
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selectMode(state.defaultMode);
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function detectFileType() {
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var extension = extensionFor(state.fileName);
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var baseType = state.contentType.split(";")[0].trim();
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var language = languageFor(extension, baseType);
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var isImage = state.previewKind === "image" || baseType.indexOf("image/") === 0 && baseType !== "image/svg+xml";
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var isVideo = state.previewKind === "video" || baseType.indexOf("video/") === 0;
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var isAudio = state.previewKind === "audio" || baseType.indexOf("audio/") === 0;
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return {
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extension: extension,
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baseType: baseType,
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language: language,
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isTextLike: Boolean(language),
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isHTML: language === "html",
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isMarkdown: language === "markdown",
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isImage: isImage,
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isVideo: isVideo,
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isAudio: isAudio,
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isMobile: window.matchMedia && window.matchMedia("(max-width: 720px), (pointer: coarse)").matches
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};
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}
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function buildTabs(type) {
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var tabs = [{ mode: "default", label: "Default" }];
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if (type.isImage) {
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tabs.push({ mode: "image", label: "Image Preview" });
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return tabs;
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}
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if (type.isVideo) {
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tabs.push({ mode: "video", label: "Video Preview" });
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return tabs;
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}
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if (type.isAudio) {
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tabs.push({ mode: "browser-audio", label: "Browser Preview" });
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return tabs;
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}
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if (type.isTextLike) {
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if (type.isHTML || type.isMarkdown) {
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tabs.push({ mode: "render", label: "Render Preview" });
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}
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tabs.push({ mode: "raw", label: "Raw Preview" });
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tabs.push({ mode: "code", label: "Code Preview" });
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}
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return tabs;
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}
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function chooseDefaultMode(type, tabs) {
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if (type.isImage) {
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return "image";
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}
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if (type.isVideo) {
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return "video";
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}
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if (state.sizeBytes > LARGE_PREVIEW_BYTES) {
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if (type.isAudio && hasMode(tabs, "browser-audio")) {
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return "browser-audio";
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}
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return "default";
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}
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if (type.isAudio) {
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return "browser-audio";
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}
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if (type.isTextLike && state.sizeBytes > SMALL_TEXT_BYTES) {
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return "raw";
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}
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if (type.isMarkdown) {
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return "render";
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}
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if (type.isTextLike) {
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return "code";
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}
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return "default";
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}
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function renderTabs() {
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if (!els.tabs) {
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return;
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}
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els.tabs.innerHTML = "";
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state.tabs.forEach(function (tab) {
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var button = document.createElement("button");
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button.className = "preview-tab";
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button.type = "button";
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button.dataset.previewTab = tab.mode;
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button.textContent = tab.label;
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button.addEventListener("click", function () {
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selectMode(tab.mode);
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});
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els.tabs.appendChild(button);
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});
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}
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function selectMode(mode) {
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if (!hasMode(state.tabs, mode)) {
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mode = "default";
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}
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if (mode !== "render") {
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exitRenderFullscreen();
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}
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if (requiresLargeConfirmation(mode)) {
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showLargeGate(mode);
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return;
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}
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state.activeMode = mode;
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updateTabs(mode);
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updateRenderFullscreenButton();
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hideAllPanes();
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setModeLabel(labelForMode(mode));
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if (mode === "default") {
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show(els.defaultPane);
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} else if (mode === "image") {
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show(els.imagePane);
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} else if (mode === "video") {
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show(els.videoPane);
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} else if (mode === "browser-audio") {
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show(els.browserAudioPane);
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} else if (mode === "raw") {
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show(els.rawPane);
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ensureRawPreview();
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} else if (mode === "code") {
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show(els.codePane);
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ensurePrismPreview();
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} else if (mode === "render") {
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show(els.renderPane);
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if (fileType.isMarkdown) {
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ensureMarkdownRenderPreview();
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} else {
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ensureHTMLRenderPreview();
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}
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}
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}
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function requiresLargeConfirmation(mode) {
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if (state.sizeBytes <= LARGE_PREVIEW_BYTES || state.confirmedLargeModes[mode]) {
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return false;
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}
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return mode === "raw" || mode === "code" || mode === "render";
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}
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function showLargeGate(mode) {
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state.pendingMode = mode;
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updateTabs(state.activeMode || state.defaultMode);
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updateRenderFullscreenButton(false);
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hideAllPanes();
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show(els.gatePane);
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setModeLabel("Large preview");
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}
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function bindLargeGate() {
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if (els.gateConfirm) {
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els.gateConfirm.addEventListener("click", function () {
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if (!state.pendingMode) {
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return;
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}
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state.confirmedLargeModes[state.pendingMode] = true;
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selectMode(state.pendingMode);
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});
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}
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if (els.gateCancel) {
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els.gateCancel.addEventListener("click", function () {
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state.pendingMode = "";
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selectMode(state.activeMode || state.defaultMode || "default");
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});
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}
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}
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function bindThemeChanges() {
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var themeSelect = document.querySelector("[data-theme-select]");
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if (!themeSelect) {
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return;
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}
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themeSelect.addEventListener("change", function () {
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window.setTimeout(function () {
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if (!fileType.isMarkdown || !state.renderLoaded) {
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return;
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}
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state.renderLoaded = false;
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if (state.activeMode === "render") {
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ensureMarkdownRenderPreview();
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}
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}, 0);
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});
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}
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function bindRenderFullscreen() {
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if (!els.fullscreenButton) {
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return;
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}
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els.fullscreenButton.addEventListener("click", function () {
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if (isRenderFullscreen()) {
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exitRenderFullscreen();
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return;
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}
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enterRenderFullscreen();
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});
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document.addEventListener("fullscreenchange", updateRenderFullscreenButton);
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}
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function ensureTextLoaded() {
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if (state.textLoaded) {
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return Promise.resolve(state.textSource);
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}
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showLoading("Loading preview...");
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return fetch(state.sourceURL, { credentials: "same-origin" })
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.then(function (response) {
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if (!response.ok) {
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throw new Error("Preview failed");
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}
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return response.text();
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})
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.then(function (source) {
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state.textSource = source;
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state.textLoaded = true;
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hide(els.placeholder);
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return source;
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})
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.catch(function (error) {
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showError("Preview unavailable");
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throw error;
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});
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}
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function ensureRawPreview() {
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if (state.rawLoaded) {
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return;
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}
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ensureTextLoaded().then(function (source) {
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els.rawOutput.textContent = source;
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state.rawLoaded = true;
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if (state.activeMode === "raw") {
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hide(els.placeholder);
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show(els.rawPane);
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}
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});
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}
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function ensurePrismPreview() {
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if (state.prismLoaded) {
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return;
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}
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showLoading("Loading syntax preview...");
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Promise.all([ensureTextLoaded(), loadPrism()])
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.then(function (results) {
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var source = results[0];
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var language = fileType.language;
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if (language === "json") {
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source = formatJSON(source);
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}
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els.codeOutput.className = "language-" + language;
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els.codeOutput.textContent = source;
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if (window.Prism) {
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window.Prism.highlightElement(els.codeOutput);
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}
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state.prismLoaded = true;
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if (state.activeMode === "code") {
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hide(els.placeholder);
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show(els.codePane);
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}
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})
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.catch(function () {
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showError("Syntax preview unavailable");
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});
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}
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function ensureHTMLRenderPreview() {
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if (state.renderLoaded) {
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return;
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}
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showLoading("Rendering preview...");
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ensureTextLoaded()
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.then(function (source) {
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els.renderPane.srcdoc = withBaseElement(source);
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state.renderLoaded = true;
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if (state.activeMode === "render") {
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hide(els.placeholder);
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show(els.renderPane);
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}
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})
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.catch(function () {
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showError("Render preview unavailable");
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});
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}
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function ensureMarkdownRenderPreview() {
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if (state.renderLoaded) {
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return;
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}
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showLoading("Rendering Markdown...");
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Promise.all([ensureTextLoaded(), loadMarkdownLibs()])
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.then(function (results) {
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var markdown = results[0];
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var html = parseMarkdown(markdown);
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var clean = window.DOMPurify.sanitize(html);
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els.renderPane.srcdoc = markdownDocument(clean);
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state.renderLoaded = true;
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if (state.activeMode === "render") {
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hide(els.placeholder);
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show(els.renderPane);
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}
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})
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.catch(function () {
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showError("Markdown preview unavailable");
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});
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}
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function showLoading(message) {
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if (!els.placeholder) {
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return;
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}
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var text = els.placeholder.querySelector("p");
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if (text) {
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text.textContent = message;
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}
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show(els.placeholder);
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}
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function showError(message) {
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hideAllPanes();
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var text = els.placeholder && els.placeholder.querySelector("p");
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if (text) {
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text.textContent = message;
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}
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show(els.placeholder);
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}
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function hideAllPanes() {
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hide(els.defaultPane);
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hide(els.imagePane);
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hide(els.videoPane);
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hide(els.browserAudioPane);
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hide(els.rawPane);
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hide(els.codePane);
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hide(els.renderPane);
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hide(els.gatePane);
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hide(els.placeholder);
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}
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function enterRenderFullscreen() {
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if (state.activeMode !== "render") {
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return;
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}
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if (preview.requestFullscreen) {
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var request = preview.requestFullscreen();
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if (request && typeof request.catch === "function") {
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request.catch(function () {
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state.renderFullscreenFallback = true;
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preview.classList.add("is-render-fullscreen");
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updateRenderFullscreenButton();
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});
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}
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return;
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}
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state.renderFullscreenFallback = true;
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preview.classList.add("is-render-fullscreen");
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updateRenderFullscreenButton();
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}
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function exitRenderFullscreen() {
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if (document.fullscreenElement === preview && document.exitFullscreen) {
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var exit = document.exitFullscreen();
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if (exit && typeof exit.catch === "function") {
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exit.catch(function () {});
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}
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}
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state.renderFullscreenFallback = false;
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preview.classList.remove("is-render-fullscreen");
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updateRenderFullscreenButton();
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}
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function isRenderFullscreen() {
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return document.fullscreenElement === preview || state.renderFullscreenFallback;
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}
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function updateRenderFullscreenButton(forceVisible) {
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if (!els.fullscreenButton) {
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return;
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}
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var visible = typeof forceVisible === "boolean" ? forceVisible : state.activeMode === "render";
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els.fullscreenButton.hidden = !visible;
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els.fullscreenButton.textContent = isRenderFullscreen() ? "Exit Full Screen" : "Full Screen";
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els.fullscreenButton.setAttribute("aria-pressed", isRenderFullscreen() ? "true" : "false");
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}
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function updateTabs(mode) {
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if (!els.tabs) {
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return;
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}
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Array.prototype.forEach.call(els.tabs.querySelectorAll("[data-preview-tab]"), function (button) {
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button.classList.toggle("is-active", button.dataset.previewTab === mode);
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});
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}
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function show(element) {
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if (element) {
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element.hidden = false;
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}
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}
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function hide(element) {
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if (element) {
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element.hidden = true;
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}
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}
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function setModeLabel(label) {
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if (els.modeLabel) {
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els.modeLabel.textContent = label;
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}
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}
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function hasMode(tabs, mode) {
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return tabs.some(function (tab) {
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return tab.mode === mode;
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});
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}
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function labelForMode(mode) {
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var labels = {
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"default": "Default",
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"image": "Image preview",
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"video": "Video preview",
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"browser-audio": "Browser preview",
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"raw": "Raw preview",
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"code": "Code preview",
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"render": "Render preview"
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};
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return labels[mode] || "Preview";
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}
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function loadPrism() {
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if (window.Prism) {
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return Promise.resolve();
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}
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window.Prism = window.Prism || {};
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window.Prism.manual = true;
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return Promise.all([
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loadStyle("/static/lib/prismjs/prism.css"),
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loadScript("/static/lib/prismjs/prism.js")
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]);
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}
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function loadMarkdownLibs() {
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if (window.marked && window.DOMPurify) {
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return Promise.resolve();
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}
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return Promise.all([
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loadScript("/static/lib/markdown/marked.umd.js"),
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loadScript("/static/lib/markdown/purify.min.js")
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]);
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}
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function loadScript(src) {
|
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return new Promise(function (resolve, reject) {
|
|
var existing = document.querySelector('script[src="' + src + '"]');
|
|
if (existing) {
|
|
if (existing.dataset.loaded === "true") {
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|
resolve();
|
|
return;
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}
|
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existing.addEventListener("load", resolve, { once: true });
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|
existing.addEventListener("error", reject, { once: true });
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return;
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}
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|
|
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var script = document.createElement("script");
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|
script.async = true;
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|
script.src = src;
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|
script.addEventListener("load", function () {
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script.dataset.loaded = "true";
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resolve();
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}, { once: true });
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|
script.addEventListener("error", reject, { once: true });
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|
document.head.appendChild(script);
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|
});
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}
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function loadStyle(href) {
|
|
if (document.querySelector('link[href="' + href + '"]')) {
|
|
return Promise.resolve();
|
|
}
|
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return new Promise(function (resolve, reject) {
|
|
var link = document.createElement("link");
|
|
link.rel = "stylesheet";
|
|
link.href = href;
|
|
link.addEventListener("load", resolve, { once: true });
|
|
link.addEventListener("error", reject, { once: true });
|
|
document.head.appendChild(link);
|
|
});
|
|
}
|
|
|
|
function parseMarkdown(source) {
|
|
if (window.marked && typeof window.marked.parse === "function") {
|
|
return window.marked.parse(source);
|
|
}
|
|
if (window.marked && window.marked.marked && typeof window.marked.marked.parse === "function") {
|
|
return window.marked.marked.parse(source);
|
|
}
|
|
throw new Error("Marked unavailable");
|
|
}
|
|
|
|
function markdownDocument(body) {
|
|
var theme = currentTheme();
|
|
var base = '<base href="' + escapeAttribute(new URL(state.sourceURL, window.location.href).href) + '">';
|
|
return '<!doctype html><html data-theme="' + escapeAttribute(theme) + '"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1">' +
|
|
base +
|
|
'<link rel="stylesheet" href="/static/css/80-markdown-preview.css">' +
|
|
'<style>' + markdownThemeStyle(theme) + '</style>' +
|
|
'</head><body><main>' + body + '</main></body></html>';
|
|
}
|
|
|
|
function markdownThemeStyle(theme) {
|
|
var themes = {
|
|
revamp: ["dark", "#0b0b16", "#f5f3ff", "#aaa4d6", "#17142d", "#211b3e", "rgba(168,150,255,0.24)", "#67e8f9", "#a78bfa", "#1b1724", "#0f111a", "#f8fafc", "rgba(248,250,252,0.16)", "rgba(0,0,0,0.28)", "Inter,system-ui,-apple-system,BlinkMacSystemFont,\"Segoe UI\",sans-serif", "Consolas,Monaco,\"Andale Mono\",\"Ubuntu Mono\",monospace"],
|
|
classic: ["dark", "#09090b", "#fafafa", "#a1a1aa", "#18181b", "#27272a", "rgba(255,255,255,0.13)", "#e4e4e7", "#d4d4d8", "#111113", "#09090b", "#fafafa", "rgba(250,250,250,0.15)", "rgba(0,0,0,0.3)", "Inter,system-ui,-apple-system,BlinkMacSystemFont,\"Segoe UI\",sans-serif", "Consolas,Monaco,\"Andale Mono\",\"Ubuntu Mono\",monospace"],
|
|
retro: ["light", "#c0c0c0", "#000000", "#404040", "#ffffff", "#dfdfdf", "#000000", "#000078", "#000078", "#ffffff", "#000000", "#f5f5f5", "#808080", "transparent", "\"PixeloidSans\",\"PixelOperator\",\"Microsoft Sans Serif\",Tahoma,sans-serif", "\"PixelOperatorMono\",Consolas,monospace"],
|
|
gruvbox: ["dark", "#1d2021", "#ebdbb2", "#bdae93", "#282828", "#32302f", "rgba(235,219,178,0.2)", "#fabd2f", "#d79921", "#1b1d1e", "#161819", "#fbf1c7", "rgba(251,241,199,0.18)", "rgba(0,0,0,0.26)", "Inter,system-ui,-apple-system,BlinkMacSystemFont,\"Segoe UI\",sans-serif", "Consolas,Monaco,\"Andale Mono\",\"Ubuntu Mono\",monospace"],
|
|
cyberpunk: ["dark", "#08070d", "#fff36f", "#9bfaff", "#16131f", "#251d34", "rgba(255,242,0,0.34)", "#00f0ff", "#ff2a6d", "#100d18", "#07060b", "#f8fafc", "rgba(0,240,255,0.26)", "rgba(255,42,109,0.14)", "Inter,system-ui,-apple-system,BlinkMacSystemFont,\"Segoe UI\",sans-serif", "Consolas,Monaco,\"Andale Mono\",\"Ubuntu Mono\",monospace"]
|
|
};
|
|
var t = themes[theme] || themes.revamp;
|
|
var vars = "color-scheme:" + t[0] + ";--md-bg:" + t[1] + ";--md-fg:" + t[2] + ";--md-muted:" + t[3] + ";--md-panel:" + t[4] + ";--md-panel-2:" + t[5] + ";--md-border:" + t[6] + ";--md-link:" + t[7] + ";--md-accent:" + t[8] + ";--md-code-bg:" + t[9] + ";--md-block-code-bg:" + t[10] + ";--md-block-code-fg:" + t[11] + ";--md-block-code-border:" + t[12] + ";--md-shadow:" + t[13] + ";--md-font:" + t[14] + ";--md-mono:" + t[15] + ";";
|
|
return ":root{" + vars + "}*{box-sizing:border-box}html,body{min-height:100%;margin:0;background:var(--md-bg);color:var(--md-fg);font-family:var(--md-font)}body{padding:clamp(1rem,4vw,2.25rem);font-size:16px;line-height:1.65}main{max-width:54rem;margin:0 auto;padding:clamp(1rem,3vw,2rem);border:1px solid var(--md-border);border-radius:10px;background:var(--md-panel);box-shadow:0 20px 60px var(--md-shadow)}a{color:var(--md-link)}h1,h2,h3,h4,h5,h6{color:var(--md-fg);line-height:1.2}code,kbd,pre{font-family:var(--md-mono)}pre{overflow:auto;padding:1rem;border:1px solid var(--md-block-code-border)!important;background:var(--md-block-code-bg)!important;color:var(--md-block-code-fg)!important}code{background:var(--md-code-bg);border-radius:4px;padding:.12rem .3rem}pre code,pre>code,pre code[class*=\"language-\"]{padding:0!important;background:transparent!important;color:inherit!important;border:0!important}blockquote{margin:1rem 0;padding:.2rem 1rem;border-left:3px solid var(--md-accent);color:var(--md-muted);background:var(--md-panel-2)}table{width:100%;border-collapse:collapse;display:block;overflow:auto}th,td{border:1px solid var(--md-border);padding:.5rem .7rem}hr{border:0;border-top:1px solid var(--md-border)}img,video{max-width:100%;height:auto}";
|
|
}
|
|
|
|
function currentTheme() {
|
|
var theme = document.documentElement.dataset.theme || "revamp";
|
|
return /^(revamp|classic|retro|gruvbox|cyberpunk)$/.test(theme) ? theme : "revamp";
|
|
}
|
|
|
|
function withBaseElement(source) {
|
|
var base = '<base href="' + escapeAttribute(new URL(state.sourceURL, window.location.href).href) + '">';
|
|
if (/<head[\s>]/i.test(source)) {
|
|
return source.replace(/<head([^>]*)>/i, "<head$1>" + base);
|
|
}
|
|
return base + source;
|
|
}
|
|
|
|
function escapeAttribute(value) {
|
|
return value.replace(/&/g, "&").replace(/"/g, """).replace(/</g, "<");
|
|
}
|
|
|
|
function formatJSON(source) {
|
|
try {
|
|
return JSON.stringify(JSON.parse(source), null, 2);
|
|
} catch (error) {
|
|
return source;
|
|
}
|
|
}
|
|
|
|
function extensionFor(name) {
|
|
var parts = name.toLowerCase().split(".");
|
|
return parts.length > 1 ? parts.pop() : "";
|
|
}
|
|
|
|
function languageFor(extension, baseType) {
|
|
var extensionMap = {
|
|
"c": "c",
|
|
"cc": "cpp",
|
|
"conf": "nginx",
|
|
"cpp": "cpp",
|
|
"cs": "csharp",
|
|
"css": "css",
|
|
"csv": "csv",
|
|
"diff": "diff",
|
|
"dockerfile": "docker",
|
|
"go": "go",
|
|
"h": "c",
|
|
"hpp": "cpp",
|
|
"htm": "html",
|
|
"html": "html",
|
|
"ini": "ini",
|
|
"java": "java",
|
|
"js": "javascript",
|
|
"json": "json",
|
|
"jsx": "jsx",
|
|
"kt": "kotlin",
|
|
"log": "log",
|
|
"lua": "lua",
|
|
"md": "markdown",
|
|
"mdown": "markdown",
|
|
"markdown": "markdown",
|
|
"php": "php",
|
|
"pl": "perl",
|
|
"properties": "properties",
|
|
"py": "python",
|
|
"rb": "ruby",
|
|
"rs": "rust",
|
|
"sh": "bash",
|
|
"sql": "sql",
|
|
"swift": "swift",
|
|
"toml": "toml",
|
|
"ts": "typescript",
|
|
"tsx": "tsx",
|
|
"txt": "text",
|
|
"xml": "xml",
|
|
"yaml": "yaml",
|
|
"yml": "yaml",
|
|
"zig": "zig"
|
|
};
|
|
var typeMap = {
|
|
"application/javascript": "javascript",
|
|
"application/json": "json",
|
|
"application/ld+json": "json",
|
|
"application/markdown": "markdown",
|
|
"application/xml": "xml",
|
|
"application/x-httpd-php": "php",
|
|
"application/x-sh": "bash",
|
|
"image/svg+xml": "xml",
|
|
"text/css": "css",
|
|
"text/csv": "csv",
|
|
"text/html": "html",
|
|
"text/javascript": "javascript",
|
|
"text/markdown": "markdown",
|
|
"text/plain": "text",
|
|
"text/x-go": "go",
|
|
"text/xml": "xml"
|
|
};
|
|
|
|
if (extensionMap[extension]) {
|
|
return extensionMap[extension];
|
|
}
|
|
if (typeMap[baseType]) {
|
|
return typeMap[baseType];
|
|
}
|
|
if (baseType.indexOf("+json") !== -1) {
|
|
return "json";
|
|
}
|
|
if (baseType.indexOf("+xml") !== -1) {
|
|
return "xml";
|
|
}
|
|
if (baseType.indexOf("text/") === 0) {
|
|
return "text";
|
|
}
|
|
return "";
|
|
}
|
|
})();
|