Fix #1255 (support webp in comic viewer)

cps/static/js/kthoom.js

@@ -141,9 +141,24 @@ var createURLFromArray = function(array, mimeType) {
 kthoom.ImageFile = function(file) {
     this.filename = file.filename;
     var fileExtension = file.filename.split(".").pop().toLowerCase();
-    this.mimeType = fileExtension === "png" ? "image/png" :
-        (fileExtension === "jpg" || fileExtension === "jpeg") ? "image/jpeg" :
-            fileExtension === "gif" ? "image/gif" : fileExtension === "svg" ? "image/xml+svg" : undefined;
+    switch (fileExtension) {
+        case "jpg":
+        case "jpeg":
+            this.mimeType = "image/jpeg";
+            break;
+        case "gif":
+            this.mimeType = "iamge/gif";
+            break;
+        case "svg":
+            this.mimeType = "image/svg+xml";
+            break;
+        case "webp":
+            this.mimeType = "image/webp";
+            break;
+        default:
+            this.mimeType = undefined;
+            break;
+    }
     if ( this.mimeType !== undefined) {
         this.dataURI = createURLFromArray(file.fileData, this.mimeType);
         this.data = file;
@@ -336,7 +351,7 @@ function setImage(url) {
                         $("#mainText").innerHTML("<iframe style=\"width:100%;height:700px;border:0\" src=\"data:text/html," + escape(xhr.responseText) + "\"></iframe>");
                     };
                     xhr.send(null);
-                } else if (!/(jpg|jpeg|png|gif)$/.test(imageFiles[currentImage].filename) && imageFiles[currentImage].data.uncompressedSize < 10 * 1024) {
+                } else if (!/(jpg|jpeg|png|gif|webp)$/.test(imageFiles[currentImage].filename) && imageFiles[currentImage].data.uncompressedSize < 10 * 1024) {
                     xhr.open("GET", url, true);
                     xhr.onload = function() {
                         $("#mainText").css("display", "");

cps/web.py

@@ -560,7 +560,7 @@ def get_comic_book(book_id, book_format, page):
                 else:
                     b64 = extract(page).encode('base64')
                 ext = names[page].rpartition('.')[-1]
-                if ext not in ('png', 'gif', 'jpg', 'jpeg'):
+                if ext not in ('png', 'gif', 'jpg', 'jpeg', 'webp'):
                     ext = 'png'
                 extractedfile="data:image/" + ext + ";base64," + b64
                 fileData={"name": names[page], "page":page, "last":len(names)-1, "content": extractedfile}