Linkifies all images in the Twitter Home stream. These links point to the :orig version while the stream content is modified to use the :small variant to increase performance. Thumbnail images in the stream are modified to display uncropped.
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// ==UserScript==
// @name Twitter - clickable links to images and show uncropped thumbnails
// @namespace twitter_linkify
// @version 1.1.0
// @license GNU AGPLv3
// @description Linkifies all images in the Twitter Home stream. These links point to the :orig version while the stream content is modified to use the :small variant to increase performance. Thumbnail images in the stream are modified to display uncropped.
// @author marp
// @homepageURL https://greasyfork.org/en/users/204542-marp
// @include https://twitter.com/
// @include https://twitter.com/*
// @include https://pbs.twimg.com/media/*
// @exclude https://twitter.com/settings
// @exclude https://twitter.com/settings/*
// @run-at document-end
// ==/UserScript==
function createImageLinks(myDoc, myContext) {
//console.info("createImageLinks: ", myContext);
if (myDoc===null) myDoc= myContext;
if (myDoc===null) return;
if (myContext===null) myContext= myDoc;
var matches;
var tmpstr;
matches=myDoc.evaluate("//div[contains(@class,'AdaptiveMedia-photoContainer')]/img",
myContext, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
for(var i=0, el; (i<matches.snapshotLength); i++) {
el=matches.snapshotItem(i);
if (el) {
try {
// console.info("matched-element: ", el);
tmpstr=getCleanImageURL(el.getAttribute("src"), false);
// console.info("cleanurl: ", tmpstr);
// only need ":small" variant for stream/thumbnail display (save bandwidth and increase performance)
el.setAttribute("src", tmpstr+":small");
// create correct link to ":orig" image - best way to access is by opening in new tab via "middle-click")
insertLinkElement(myDoc, el, tmpstr+":orig", getFilename(tmpstr));
// try to scale the thumbnail image so that it displays fully and uncropped within the available space
// This does not do a real aspect ratio calc but uses a "trick" by analysing how Twitter was positioning the cropped image
tmpstr=el.getAttribute("style").toLowerCase();
if (tmpstr.includes("top")) {
el.setAttribute("style", "height: 100%; width: auto");
}
else if (tmpstr.includes("left")) {
el.setAttribute("style", "height: auto; width: 100%");
}
} catch (e) { console.warn("error: ", e); }
}
}
}
function insertLinkElement(myDoc, wrapElement, linkTarget, downloadName) {
var newnode;
var parentnode;
newnode = myDoc.createElement("a");
newnode.setAttribute("href", linkTarget);
newnode.setAttribute("target", "_blank");
newnode.setAttribute("download", downloadName);
parentnode = wrapElement.parentNode;
parentnode.replaceChild(newnode, wrapElement);
newnode.appendChild(wrapElement);
}
function getCleanImageURL(imageurl) {
var pos = imageurl.toLowerCase().lastIndexOf(":");
var pos2 = imageurl.toLowerCase().indexOf("/");
if (pos >= 0 && pos > pos2) {
return imageurl.substring(0, pos);
} else {
return imageurl;
}
}
function getFilename(imageurl) {
return getCleanImageURL(imageurl).substring(imageurl.toLowerCase().lastIndexOf("/")+1);
}
// Two very different actions depending on if this is on twitter.com or twing.com
if (window.location.href.includes('pbs.twimg.com/media')){
var image = document.querySelector('img');
var url = image.src;
insertLinkElement(document, image, getCleanImageURL(url)+":orig", getFilename(url));
}
else
{
// create an observer instance and iterate through each individual new node
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
mutation.addedNodes.forEach(function(addedNode) {
createImageLinks(mutation.target.ownerDocument, addedNode);
});
});
});
// configuration of the observer
// NOTE: subtree is false as the wanted nodes are direct children of <ol id="posts"> -> notable performance improvement
var config = { attributes: false, childList: true, characterData: false, subtree: false };
// pass in the target node (<ol> element contains all stream posts), as well as the observer options
var postsmatch = document.evaluate("//ol[@id='stream-items-id']", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
var postsnode = postsmatch.singleNodeValue;
//process already loaded nodes (the initial posts before scrolling down for the first time)
createImageLinks(document, postsnode);
//start the observer for new nodes
observer.observe(postsnode, config);
// also observe the overlay node - this is the node used when opening an individsual post as overlay
// NOTE: subtree is true here as the wanted nodes are ancestors of the node used as observer root
var config2 = { attributes: false, childList: true, characterData: false, subtree: true };
// pass in the target node, as well as the observer options
var overlaymatch = document.evaluate("//div[contains(@class,'PermalinkOverlay-content')]", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
var overlaynode = overlaymatch.singleNodeValue;
//start the observer for overlays
observer.observe(overlaynode, config2);
}