hook up 'show pictures' button
Add 'show pictures' button for messages where the provider
claims it embeds external resources. In Gmail, this is true when
a message contains external image hotlinks. Inline image
attachments are not yet handled.
'always show' tells the provider to whitelist the message sender
to allow images in the future (works with Gmail provider).
Change-Id: I1b174d8fad9da481ec305caff06d109f9d215093
diff --git a/assets/script.js b/assets/script.js
index 1e9a2a8..e8a070e 100644
--- a/assets/script.js
+++ b/assets/script.js
@@ -15,6 +15,7 @@
* limitations under the License.
*/
+var BLOCKED_SRC_ATTR = "blocked-src";
/**
* Returns the page offset of an element.
@@ -87,6 +88,46 @@
}
}
+function hideUnsafeImages() {
+ var i, bodyCount;
+ var j, imgCount;
+ var body, image;
+ var images;
+ var showImages;
+ var bodies = document.getElementsByClassName("mail-message-content");
+ for (i = 0, bodyCount = bodies.length; i < bodyCount; i++) {
+ body = bodies[i];
+ showImages = body.classList.contains("mail-show-images");
+
+ images = body.getElementsByTagName("img");
+ for (j = 0, imgCount = images.length; j < imgCount; j++) {
+ image = images[j];
+ attachImageLoadListener(image);
+ // TODO: handle inline image attachments for all supported protocols
+ if (!showImages) {
+ blockImage(image);
+ }
+ }
+ }
+}
+
+function attachImageLoadListener(imageElement) {
+ // Reset the src attribute to the empty string because onload will only fire if the src
+ // attribute is set after the onload listener.
+ var originalSrc = imageElement.src;
+ imageElement.src = '';
+ imageElement.onload = measurePositions;
+ imageElement.src = originalSrc;
+}
+
+function blockImage(imageElement) {
+ var src = imageElement.src;
+ if (src.indexOf("http://") == 0 || src.indexOf("https://") == 0) {
+ imageElement.setAttribute(BLOCKED_SRC_ATTR, src);
+ imageElement.src = "data:";
+ }
+}
+
function measurePositions() {
var headerHeights;
var headerBottoms;
@@ -108,7 +149,28 @@
window.mail.onWebContentGeometryChange(headerBottoms, headerHeights);
}
+// BEGIN Java->JavaScript handlers
+function unblockImages(messageDomId) {
+ var i, images, imgCount, image, blockedSrc;
+ var msg = document.getElementById(messageDomId);
+ if (!msg) {
+ console.log("can't unblock, no matching message for id: " + messageDomId);
+ return;
+ }
+ images = msg.getElementsByTagName("img");
+ for (i = 0, imgCount = images.length; i < imgCount; i++) {
+ image = images[i];
+ blockedSrc = image.getAttribute(BLOCKED_SRC_ATTR);
+ if (blockedSrc) {
+ image.src = blockedSrc;
+ image.removeAttribute(BLOCKED_SRC_ATTR);
+ }
+ }
+}
+// END Java->JavaScript handlers
+
collapseQuotedText();
+hideUnsafeImages();
shrinkWideMessages();
measurePositions();