fix crash on image with no data

src/lib/formatters.js

@@ -349,15 +349,21 @@ function quoteImage(data) {
   // Get the blob from the image data.
   if (data.val) {
     const blob = base64ToBlob(data.val, data.mime);
-    promise = blob ? Promise.resolve(blob) : Promise.reject(new Error("Invalid image"));
+    if (!blob) {
-  } else {
+      throw new Error("Invalid image");
-    promise = fetch(this.authorizeURL(sanitizeImageUrl(data.ref))).then(evt => {
+    }
+    promise = Promise.resolve(blob);
+  } else if (data.ref) {
+    promise = fetch(this.authorizeURL(sanitizeImageUrl(data.ref)))
+      .then(evt => {
         if (evt.ok) {
           return evt.blob();
         } else {
           throw new Error(`Image fetch unsuccessful: ${evt.status} ${evt.statusText}`);
         }
       });
+  } else {
+    throw new Error("Missing image data");
   }
 
   // Scale the blob.
@@ -392,7 +398,13 @@ function quoteImage(data) {
 export function replyFormatter(style, data, values, key, stack) {
   if (style == 'IM') {
     const attr = inlineImageAttr.call(this, {key: key}, data);
-    attr.whenDone = cancelablePromise(quoteImage.call(this, data));
+    let loadedPromise;
+    try {
+      loadedPromise = cancelablePromise(quoteImage.call(this, data));
+    } catch (error) {
+      loadedPromise = cancelablePromise(error);
+    }
+    attr.whenDone = loadedPromise;
     values = [React.createElement(LazyImage, attr, null), ' ', attr.alt];
     return React.createElement(React.Fragment, {key: key}, values);
   } else if (style == 'QQ') {

src/lib/utils.js

@@ -183,10 +183,14 @@ export function deliveryMarker(received) {
 }
 
 // Wraps a promise to make it cancelable.
+// The parameter can be either a promise or an error. If it's an error, the wrapped promise is
+// created in a rejected state.
 export function cancelablePromise(promise) {
   let hasCanceled = false;
 
-  const wrappedPromise = new Promise((resolve, reject) => {
+  const wrappedPromise = promise instanceof Error ?
+    Promise.reject(promise) :
+    new Promise((resolve, reject) => {
       promise.then(
         result => hasCanceled ? reject({isCanceled: true}) : resolve(result),
         error => hasCanceled ? reject({isCanceled: true}) : reject(error)
@@ -195,7 +199,7 @@ export function cancelablePromise(promise) {
 
   return {
     promise: wrappedPromise,
-    cancel( ) {
+    cancel() {
       hasCanceled = true;
     },
   };

src/widgets/image-preview.jsx

@@ -55,7 +55,7 @@ export default class ImagePreview extends React.PureComponent {
       <div id="image-preview">
         <div id="image-preview-caption-panel">
           {!this.props.onSendMessage ?
-            <a href={this.props.content.url} download={this.props.content.name}>
+            <a href={this.props.content.url} download={true}>
               <i className="material-icons">file_download</i> <FormattedMessage
                 id="download_action" defaultMessage="download" description="Call to action [download]" />
             </a>

src/widgets/lazy-image.jsx

@@ -31,6 +31,7 @@ export default class LazyImage extends React.PureComponent {
     if (prevProps.whenDone != this.props.whenDone) {
       this.setState({src: 'img/placeholder.png', style: {...this.state.style, padding: '4px'}});
       this.props.whenDone
+        .promise
         .then(data => this.setState({src: data.src, style: {...this.state.style, padding: 0}}))
         .catch(() => this.setState({src: 'img/broken_image.png'}));
     }

umd/index.dev.js

@@ -787,8 +787,13 @@ function quoteImage(data) {
 
   if (data.val) {
     const blob = (0,_blob_helpers_js__WEBPACK_IMPORTED_MODULE_6__.base64ToBlob)(data.val, data.mime);
-    promise = blob ? Promise.resolve(blob) : Promise.reject(new Error("Invalid image"));
+
-  } else {
+    if (!blob) {
+      throw new Error("Invalid image");
+    }
+
+    promise = Promise.resolve(blob);
+  } else if (data.ref) {
     promise = fetch(this.authorizeURL((0,_utils_js__WEBPACK_IMPORTED_MODULE_8__.sanitizeImageUrl)(data.ref))).then(evt => {
       if (evt.ok) {
         return evt.blob();
@@ -796,6 +801,8 @@ function quoteImage(data) {
         throw new Error("Image fetch unsuccessful: ".concat(evt.status, " ").concat(evt.statusText));
       }
     });
+  } else {
+    throw new Error("Missing image data");
   }
 
   return promise.then(blob => {
@@ -825,7 +832,15 @@ function replyFormatter(style, data, values, key, stack) {
     const attr = inlineImageAttr.call(this, {
       key: key
     }, data);
-    attr.whenDone = (0,_utils_js__WEBPACK_IMPORTED_MODULE_8__.cancelablePromise)(quoteImage.call(this, data));
+    let loadedPromise;
+
+    try {
+      loadedPromise = (0,_utils_js__WEBPACK_IMPORTED_MODULE_8__.cancelablePromise)(quoteImage.call(this, data));
+    } catch (error) {
+      loadedPromise = (0,_utils_js__WEBPACK_IMPORTED_MODULE_8__.cancelablePromise)(error);
+    }
+
+    attr.whenDone = loadedPromise;
     values = [react__WEBPACK_IMPORTED_MODULE_0___default().createElement(_widgets_lazy_image_jsx__WEBPACK_IMPORTED_MODULE_3__["default"], attr, null), ' ', attr.alt];
     return react__WEBPACK_IMPORTED_MODULE_0___default().createElement((react__WEBPACK_IMPORTED_MODULE_0___default().Fragment), {
       key: key
@@ -1312,7 +1327,7 @@ function deliveryMarker(received) {
 }
 function cancelablePromise(promise) {
   let hasCanceled = false;
-  const wrappedPromise = new Promise((resolve, reject) => {
+  const wrappedPromise = promise instanceof Error ? Promise.reject(promise) : new Promise((resolve, reject) => {
     promise.then(result => hasCanceled ? reject({
       isCanceled: true
     }) : resolve(result), error => hasCanceled ? reject({
@@ -10331,7 +10346,7 @@ class ImagePreview extends (react__WEBPACK_IMPORTED_MODULE_0___default().PureCom
       id: "image-preview-caption-panel"
     }, !this.props.onSendMessage ? react__WEBPACK_IMPORTED_MODULE_0___default().createElement("a", {
       href: this.props.content.url,
-      download: this.props.content.name
+      download: true
     }, react__WEBPACK_IMPORTED_MODULE_0___default().createElement("i", {
       className: "material-icons"
     }, "file_download"), " ", react__WEBPACK_IMPORTED_MODULE_0___default().createElement(react_intl__WEBPACK_IMPORTED_MODULE_1__.FormattedMessage, {
@@ -10684,7 +10699,7 @@ class LazyImage extends (react__WEBPACK_IMPORTED_MODULE_0___default().PureCompon
           padding: '4px'
         }
       });
-      this.props.whenDone.then(data => this.setState({
+      this.props.whenDone.promise.then(data => this.setState({
         src: data.src,
         style: { ...this.state.style,
           padding: 0