use embed size in alternative link

src/app/core/data/dspace-rest-response-parsing.service.ts

@@ -15,7 +15,8 @@ import { Injectable } from '@angular/core';
 import { ResponseParsingService } from './parsing.service';
 import { ParsedResponse } from '../cache/response.models';
 import { RestRequestMethod } from './rest-request-method';
-import { getUrlWithoutEmbedParams } from '../index/index.selectors';
+import { getUrlWithoutEmbedParams, getEmbedSizeParams } from '../index/index.selectors';
+import { URLCombiner } from '../url-combiner/url-combiner';
 
 /* tslint:disable:max-classes-per-file */
 
@@ -86,6 +87,8 @@ export class DspaceRestResponseParsingService implements ResponseParsingService
   }
 
   public process<ObjectDomain>(data: any, request: RestRequest, alternativeURL?: string): any {
+    const embedSizeParams = getEmbedSizeParams(request.href);
+
     if (isNotEmpty(data)) {
       if (hasNoValue(data) || (typeof data !== 'object')) {
         return data;
@@ -100,7 +103,13 @@ export class DspaceRestResponseParsingService implements ResponseParsingService
             .keys(data._embedded)
             .filter((property) => data._embedded.hasOwnProperty(property))
             .forEach((property) => {
-              this.process<ObjectDomain>(data._embedded[property], request, data._links[property].href);
+              let embedAltUrl = data._links[property].href;
+              const match = embedSizeParams
+                .find((param: { name: string, size: number }) => param.name === property);
+              if (hasValue(match)) {
+                embedAltUrl = new URLCombiner(embedAltUrl, `?size=${match.size}`).toString();
+              }
+              this.process<ObjectDomain>(data._embedded[property], request, embedAltUrl);
             });
         }
 

src/app/core/index/index.selectors.ts

@@ -24,7 +24,7 @@ export const getUrlWithoutEmbedParams = (url: string): string => {
     if (isNotEmpty(parsed.query)) {
       const parts = parsed.query.split(/[?|&]/)
         .filter((part: string) => isNotEmpty(part))
-        .filter((part: string) => !part.startsWith('embed='));
+        .filter((part: string) => !(part.startsWith('embed=') || part.startsWith('embed.size=')));
       let args = '';
       if (isNotEmpty(parts)) {
         args = `?${parts.join('&')}`;
@@ -37,6 +37,27 @@ export const getUrlWithoutEmbedParams = (url: string): string => {
   return url;
 };
 
+/**
+ * Parse the embed size params from a url
+ * @param url The url to parse
+ */
+export const getEmbedSizeParams = (url: string): { name: string, size: number }[] => {
+  if (isNotEmpty(url)) {
+    const parsed = parse(url);
+    if (isNotEmpty(parsed.query)) {
+      return parsed.query.split(/[?|&]/)
+        .filter((part: string) => isNotEmpty(part))
+        .map((part: string) => part.match(/^embed.size=([^=]+)=(\d+)$/))
+        .filter((matches: RegExpMatchArray) => hasValue(matches) && hasValue(matches[1]) && hasValue(matches[2]))
+        .map((matches: RegExpMatchArray) => {
+          return { name: matches[1], size: Number(matches[2]) };
+        });
+    }
+  }
+
+  return [];
+};
+
 /**
  * Return the MetaIndexState based on the CoreSate
  *