Add default icons for FileAttachment annotations (bug 1230933)

*Please note:* This "borrows" the icons from Thunderbird.

According to the PDF specification, see https://web.archive.org/web/20220309040754if_/https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#G11.2096626, we should be providing default icons for FileAttachment annotations without appearances.

src/core/annotation.js

@@ -4274,10 +4274,15 @@ class FileAttachmentAnnotation extends MarkupAnnotation {
   constructor(params) {
     super(params);
 
-    const file = new FileSpec(params.dict.get("FS"), params.xref);
+    const { dict, xref } = params;
+    const file = new FileSpec(dict.get("FS"), xref);
 
     this.data.annotationType = AnnotationType.FILEATTACHMENT;
     this.data.file = file.serializable;
+
+    const name = dict.get("Name");
+    this.data.name =
+      name instanceof Name ? stringToPDFString(name.name) : "PushPin";
   }
 }
 

src/display/annotation_layer.js

@@ -2509,7 +2509,20 @@ class FileAttachmentAnnotationElement extends AnnotationElement {
   render() {
     this.container.className = "fileAttachmentAnnotation";
 
-    const trigger = document.createElement("div");
+    let trigger;
+    if (this.data.hasAppearance) {
+      trigger = document.createElement("div");
+    } else {
+      // Unfortunately it seems that it's not clearly specified exactly what
+      // names are actually valid, since Table 184 contains:
+      //   Conforming readers shall provide predefined icon appearances for at
+      //   least the following standard names: GraphPushPin, PaperclipTag.
+      //   Additional names may be supported as well. Default value: PushPin.
+      trigger = document.createElement("img");
+      trigger.src = `${this.imageResourcesPath}annotation-${
+        /paperclip/i.test(this.data.name) ? "paperclip" : "pushpin"
+      }.svg`;
+    }
     trigger.className = "popupTriggerArea";
     trigger.addEventListener("dblclick", this._download.bind(this));
 

test/pdfs/bug1230933.pdf.link

@@ -0,0 +1 @@
+https://bugzilla.mozilla.org/attachment.cgi?id=8696459

test/test_manifest.json

@@ -6064,6 +6064,14 @@
        "type": "eq",
        "annotations": true
     },
+    {  "id": "bug1230933",
+       "file": "pdfs/bug1230933.pdf",
+       "md5": "d8e7dce9ce79aa5a6121b21be8935429",
+       "link": true,
+       "rounds": 1,
+       "type": "eq",
+       "annotations": true
+    },
     {  "id": "issue14117",
        "file": "pdfs/issue14117.pdf",
        "md5": "9b1c33ad2f59f4e723c258e863149abf",