Revert file unrelevant to this work

Author: K8Sewell

src/content-handlers/iiif/modules/uv-mediaelementcenterpanel-module/MediaElementCenterPanel.ts

@@ -27,17 +27,6 @@ type TextTrackDescriptor = {
   id: string;
 };
 
-const captionTypes = new Set<String>(["text/vtt", "text/srt"]);
-
-// A label in raw annotation JSON may be a plain string or a language map.
-const captionLabel = (label: any): string | undefined => {
-  if (!label || typeof label === "string") {
-    return label || undefined;
-  }
-  const values = label[Object.keys(label)[0]];
-  return Array.isArray(values) ? values[0] : undefined;
-};
-
 type MediaSourceDescriptor = {
   label: string;
   type: string;
@@ -217,23 +206,7 @@ export class MediaElementCenterPanel extends CenterPanel<
       }
     }
 
-    // Captions may also be supplied as supplementing annotations on the
-    // canvas (IIIF cookbook recipe 0219).
-    const supplementing = await this.getSupplementingCaptions(canvas);
-    for (const caption of supplementing) {
-      if (!subtitles.some((subtitle) => subtitle.id === caption.id)) {
-        subtitles.push(caption);
-      }
-    }
-
     if (subtitles.length > 0) {
-      // Resolve caption URLs to ones the player's XHR will be able to read.
-      for (const subtitle of subtitles) {
-        if (subtitle.id) {
-          subtitle.id = await this.resolveCaptionSource(subtitle.id);
-        }
-      }
-
       // Show captions options popover for better interface feedback
       subtitles.unshift({ id: "none" });
     }
@@ -419,96 +392,6 @@ export class MediaElementCenterPanel extends CenterPanel<
     this.extensionHost.publish(Events.LOAD);
   }
 
-  // Captions/transcriptions supplied as supplementing annotations in the
-  // canvas' annotations pages (IIIF cookbook recipe 0219). Inline
-  // annotation pages are read directly; pages referenced by id alone are
-  // fetched.
-  async getSupplementingCaptions(
-    canvas: Canvas
-  ): Promise<TextTrackDescriptor[]> {
-    const captions: TextTrackDescriptor[] = [];
-    const pages: any[] = canvas.getProperty("annotations") || [];
-
-    for (const page of pages) {
-      let items: any[] = page.items;
-
-      if (!items && page.id) {
-        try {
-          const response = await fetch(page.id);
-          if (response.ok) {
-            items = (await response.json()).items;
-          }
-        } catch {
-          console.warn(
-            `Annotation page ${page.id} could not be read (CORS headers are required); any captions it contains will be unavailable.`
-          );
-        }
-      }
-
-      if (!items) {
-        continue;
-      }
-
-      for (const annotation of items) {
-        const motivations = Array.isArray(annotation.motivation)
-          ? annotation.motivation
-          : [annotation.motivation];
-
-        if (!motivations.includes("supplementing")) {
-          continue;
-        }
-
-        const bodies = Array.isArray(annotation.body)
-          ? annotation.body
-          : [annotation.body];
-
-        for (const body of bodies) {
-          if (body && body.id && captionTypes.has(body.format)) {
-            captions.push({
-              id: body.id,
-              label: captionLabel(body.label),
-              language: body.language,
-            });
-          }
-        }
-      }
-    }
-
-    return captions;
-  }
-
-  // Captions are fetched with XHR by the player, so a cross-origin URL is
-  // only readable when every response hop carries CORS headers. Follow any
-  // CORS-friendly redirect to its final URL, and retry plain-http sources
-  // over https — an http -> https upgrade redirect whose 301 response lacks
-  // CORS headers is blocked by the browser even though its destination is
-  // readable.
-  async resolveCaptionSource(src: string): Promise<string> {
-    const attempts: string[] = [src];
-
-    if (src.startsWith("http://")) {
-      attempts.push(src.replace(/^http:\/\//, "https://"));
-    }
-
-    for (const attempt of attempts) {
-      try {
-        const response = await fetch(attempt);
-        if (response.ok) {
-          return response.url;
-        }
-      } catch {
-        // expected when the attempt is blocked by CORS or mixed content;
-        // fall through to the next candidate
-      }
-    }
-
-    console.warn(
-      `Captions at ${src} could not be read (CORS headers are required on every response, including redirects); the player will omit this track.`
-    );
-
-    return src;
-  }
-
   appendTextTracks(subtitles: Array<TextTrackDescriptor>) {
     for (const subtitle of subtitles) {
       this.$media.append(
@@ -546,14 +429,16 @@ export class MediaElementCenterPanel extends CenterPanel<
     return typeGroup === "audio" || typeGroup === "video";
   }
 
-  // vtt, srt
+  // vtt, srt, csv
   isTypeCaption(element: Rendering | AnnotationBody) {
     const type: RenderingFormat | MediaType | null = element.getFormat();
 
     if (type === null) {
       return false;
     }
 
+    const captionTypes = new Set<String>(["text/vtt", "text/srt"]);
+
     return captionTypes.has(type.toString());
   }