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Diffstat (limited to 'browser/actors/PageInfoChild.sys.mjs')
| -rw-r--r-- | browser/actors/PageInfoChild.sys.mjs | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/browser/actors/PageInfoChild.sys.mjs b/browser/actors/PageInfoChild.sys.mjs new file mode 100644 index 0000000000..80a45fc817 --- /dev/null +++ b/browser/actors/PageInfoChild.sys.mjs @@ -0,0 +1,392 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +const lazy = {}; + +ChromeUtils.defineESModuleGetters(lazy, { + E10SUtils: "resource://gre/modules/E10SUtils.sys.mjs", + PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs", + setTimeout: "resource://gre/modules/Timer.sys.mjs", +}); + +export class PageInfoChild extends JSWindowActorChild { + async receiveMessage(message) { + let window = this.contentWindow; + let document = window.document; + + //Handles two different types of messages: one for general info (PageInfo:getData) + //and one for media info (PageInfo:getMediaData) + switch (message.name) { + case "PageInfo:getData": { + return Promise.resolve({ + metaViewRows: this.getMetaInfo(document), + docInfo: this.getDocumentInfo(document), + windowInfo: this.getWindowInfo(window), + }); + } + case "PageInfo:getMediaData": { + return Promise.resolve({ + mediaItems: await this.getDocumentMedia(document), + }); + } + } + + return undefined; + } + + getMetaInfo(document) { + let metaViewRows = []; + + // Get the meta tags from the page. + let metaNodes = document.getElementsByTagName("meta"); + + for (let metaNode of metaNodes) { + metaViewRows.push([ + metaNode.name || + metaNode.httpEquiv || + metaNode.getAttribute("property"), + metaNode.content, + ]); + } + + return metaViewRows; + } + + getWindowInfo(window) { + let windowInfo = {}; + windowInfo.isTopWindow = window == window.top; + + let hostName = null; + try { + hostName = Services.io.newURI(window.location.href).displayHost; + } catch (exception) {} + + windowInfo.hostName = hostName; + return windowInfo; + } + + getDocumentInfo(document) { + let docInfo = {}; + docInfo.title = document.title; + docInfo.location = document.location.toString(); + try { + docInfo.location = Services.io.newURI( + document.location.toString() + ).displaySpec; + } catch (exception) {} + docInfo.referrer = document.referrer; + try { + if (document.referrer) { + docInfo.referrer = Services.io.newURI(document.referrer).displaySpec; + } + } catch (exception) {} + docInfo.compatMode = document.compatMode; + docInfo.contentType = document.contentType; + docInfo.characterSet = document.characterSet; + docInfo.lastModified = document.lastModified; + docInfo.principal = document.nodePrincipal; + docInfo.cookieJarSettings = lazy.E10SUtils.serializeCookieJarSettings( + document.cookieJarSettings + ); + + let documentURIObject = {}; + documentURIObject.spec = document.documentURIObject.spec; + docInfo.documentURIObject = documentURIObject; + + docInfo.isContentWindowPrivate = + lazy.PrivateBrowsingUtils.isContentWindowPrivate(document.ownerGlobal); + + return docInfo; + } + + /** + * Returns an array that stores all mediaItems found in the document + * Calls getMediaItems for all nodes within the constructed tree walker and forms + * resulting array. + */ + async getDocumentMedia(document) { + let nodeCount = 0; + let content = document.ownerGlobal; + let iterator = document.createTreeWalker( + document, + content.NodeFilter.SHOW_ELEMENT + ); + + let totalMediaItems = []; + + while (iterator.nextNode()) { + let mediaItems = this.getMediaItems(document, iterator.currentNode); + + if (++nodeCount % 500 == 0) { + // setTimeout every 500 elements so we don't keep blocking the content process. + await new Promise(resolve => lazy.setTimeout(resolve, 10)); + } + totalMediaItems.push(...mediaItems); + } + + return totalMediaItems; + } + + getMediaItems(document, elem) { + // Check for images defined in CSS (e.g. background, borders) + let computedStyle = elem.ownerGlobal.getComputedStyle(elem); + // A node can have multiple media items associated with it - for example, + // multiple background images. + let mediaItems = []; + let content = document.ownerGlobal; + + let addMedia = (url, type, alt, el, isBg, altNotProvided = false) => { + let element = this.serializeElementInfo(document, url, el, isBg); + mediaItems.push({ + url, + type, + alt, + altNotProvided, + element, + isBg, + }); + }; + + if (computedStyle) { + let addImgFunc = (type, urls) => { + for (let url of urls) { + addMedia(url, type, "", elem, true, true); + } + }; + // FIXME: This is missing properties. See the implementation of + // getCSSImageURLs for a list of properties. + // + // If you don't care about the message you can also pass "all" here and + // get all the ones the browser knows about. + addImgFunc("bg-img", computedStyle.getCSSImageURLs("background-image")); + addImgFunc( + "border-img", + computedStyle.getCSSImageURLs("border-image-source") + ); + addImgFunc("list-img", computedStyle.getCSSImageURLs("list-style-image")); + addImgFunc("cursor", computedStyle.getCSSImageURLs("cursor")); + } + + // One swi^H^H^Hif-else to rule them all. + if (content.HTMLImageElement.isInstance(elem)) { + addMedia( + elem.src, + "img", + elem.getAttribute("alt"), + elem, + false, + !elem.hasAttribute("alt") + ); + } else if (content.SVGImageElement.isInstance(elem)) { + try { + // Note: makeURLAbsolute will throw if either the baseURI is not a valid URI + // or the URI formed from the baseURI and the URL is not a valid URI. + if (elem.href.baseVal) { + let href = Services.io.newURI( + elem.href.baseVal, + null, + Services.io.newURI(elem.baseURI) + ).spec; + addMedia(href, "img", "", elem, false); + } + } catch (e) {} + } else if (content.HTMLVideoElement.isInstance(elem)) { + addMedia(elem.currentSrc, "video", "", elem, false); + } else if (content.HTMLAudioElement.isInstance(elem)) { + addMedia(elem.currentSrc, "audio", "", elem, false); + } else if (content.HTMLLinkElement.isInstance(elem)) { + if (elem.rel && /\bicon\b/i.test(elem.rel)) { + addMedia(elem.href, "link", "", elem, false); + } + } else if ( + content.HTMLInputElement.isInstance(elem) || + content.HTMLButtonElement.isInstance(elem) + ) { + if (elem.type.toLowerCase() == "image") { + addMedia( + elem.src, + "input", + elem.getAttribute("alt"), + elem, + false, + !elem.hasAttribute("alt") + ); + } + } else if (content.HTMLObjectElement.isInstance(elem)) { + addMedia(elem.data, "object", this.getValueText(elem), elem, false); + } else if (content.HTMLEmbedElement.isInstance(elem)) { + addMedia(elem.src, "embed", "", elem, false); + } + + return mediaItems; + } + + /** + * Set up a JSON element object with all the instanceOf and other infomation that + * makePreview in pageInfo.js uses to figure out how to display the preview. + */ + + serializeElementInfo(document, url, item, isBG) { + let result = {}; + let content = document.ownerGlobal; + + let imageText; + if ( + !isBG && + !content.SVGImageElement.isInstance(item) && + !content.ImageDocument.isInstance(document) + ) { + imageText = item.title || item.alt; + + if (!imageText && !content.HTMLImageElement.isInstance(item)) { + imageText = this.getValueText(item); + } + } + + result.imageText = imageText; + result.longDesc = item.longDesc; + result.numFrames = 1; + + if ( + content.HTMLObjectElement.isInstance(item) || + content.HTMLEmbedElement.isInstance(item) || + content.HTMLLinkElement.isInstance(item) + ) { + result.mimeType = item.type; + } + + if ( + !result.mimeType && + !isBG && + item instanceof Ci.nsIImageLoadingContent + ) { + // Interface for image loading content. + let imageRequest = item.getRequest( + Ci.nsIImageLoadingContent.CURRENT_REQUEST + ); + if (imageRequest) { + result.mimeType = imageRequest.mimeType; + let image = + !(imageRequest.imageStatus & imageRequest.STATUS_ERROR) && + imageRequest.image; + if (image) { + result.numFrames = image.numFrames; + } + } + } + + // If we have a data url, get the MIME type from the url. + if (!result.mimeType && url.startsWith("data:")) { + let dataMimeType = /^data:(image\/[^;,]+)/i.exec(url); + if (dataMimeType) { + result.mimeType = dataMimeType[1].toLowerCase(); + } + } + + result.HTMLLinkElement = content.HTMLLinkElement.isInstance(item); + result.HTMLInputElement = content.HTMLInputElement.isInstance(item); + result.HTMLImageElement = content.HTMLImageElement.isInstance(item); + result.HTMLObjectElement = content.HTMLObjectElement.isInstance(item); + result.SVGImageElement = content.SVGImageElement.isInstance(item); + result.HTMLVideoElement = content.HTMLVideoElement.isInstance(item); + result.HTMLAudioElement = content.HTMLAudioElement.isInstance(item); + + if (isBG) { + // Items that are showing this image as a background + // image might not necessarily have a width or height, + // so we'll dynamically generate an image and send up the + // natural dimensions. + let img = content.document.createElement("img"); + img.src = url; + result.naturalWidth = img.naturalWidth; + result.naturalHeight = img.naturalHeight; + } else if (!content.SVGImageElement.isInstance(item)) { + // SVG items do not have integer values for height or width, + // so we must handle them differently in order to correctly + // serialize + + // Otherwise, we can use the current width and height + // of the image. + result.width = item.width; + result.height = item.height; + } + + if (content.SVGImageElement.isInstance(item)) { + result.SVGImageElementWidth = item.width.baseVal.value; + result.SVGImageElementHeight = item.height.baseVal.value; + } + + result.baseURI = item.baseURI; + + return result; + } + + // Other Misc Stuff + // Modified from the Links Panel v2.3, http://segment7.net/mozilla/links/links.html + // parse a node to extract the contents of the node + getValueText(node) { + let valueText = ""; + let content = node.ownerGlobal; + + // Form input elements don't generally contain information that is useful to our callers, so return nothing. + if ( + content.HTMLInputElement.isInstance(node) || + content.HTMLSelectElement.isInstance(node) || + content.HTMLTextAreaElement.isInstance(node) + ) { + return valueText; + } + + // Otherwise recurse for each child. + let length = node.childNodes.length; + + for (let i = 0; i < length; i++) { + let childNode = node.childNodes[i]; + let nodeType = childNode.nodeType; + + // Text nodes are where the goods are. + if (nodeType == content.Node.TEXT_NODE) { + valueText += " " + childNode.nodeValue; + } else if (nodeType == content.Node.ELEMENT_NODE) { + // And elements can have more text inside them. + // Images are special, we want to capture the alt text as if the image weren't there. + if (content.HTMLImageElement.isInstance(childNode)) { + valueText += " " + this.getAltText(childNode); + } else { + valueText += " " + this.getValueText(childNode); + } + } + } + + return this.stripWS(valueText); + } + + // Copied from the Links Panel v2.3, http://segment7.net/mozilla/links/links.html. + // Traverse the tree in search of an img or area element and grab its alt tag. + getAltText(node) { + let altText = ""; + + if (node.alt) { + return node.alt; + } + let length = node.childNodes.length; + for (let i = 0; i < length; i++) { + if ((altText = this.getAltText(node.childNodes[i]) != undefined)) { + // stupid js warning... + return altText; + } + } + return ""; + } + + // Copied from the Links Panel v2.3, http://segment7.net/mozilla/links/links.html. + // Strip leading and trailing whitespace, and replace multiple consecutive whitespace characters with a single space. + stripWS(text) { + let middleRE = /\s+/g; + let endRE = /(^\s+)|(\s+$)/g; + + text = text.replace(middleRE, " "); + return text.replace(endRE, ""); + } +} |