Content server: Add support for link_maps

Only URLs of type http(s) are allowed

imgsrc/srv/external-link.svg

@@ -0,0 +1 @@
+<svg width="1792" height="1792" viewBox="0 0 1792 1792" xmlns="http://www.w3.org/2000/svg"><path d="M1408 928v-480q0-26-19-45t-45-19h-480q-42 0-59 39-17 41 14 70l144 144-534 534q-19 19-19 45t19 45l102 102q19 19 45 19t45-19l534-534 144 144q18 19 45 19 12 0 25-5 39-17 39-59zm256-512v960q0 119-84.5 203.5t-203.5 84.5h-960q-119 0-203.5-84.5t-84.5-203.5v-960q0-119 84.5-203.5t203.5-84.5h960q119 0 203.5 84.5t84.5 203.5z"/></svg>

src/calibre/db/cache.py

@@ -2386,9 +2386,9 @@ class Cache:
             return cached
         links = {}
         def add_links_for_field(f):
-            table = self.fields[f].table
             field_ids = self._field_ids_for(f, book_id)
             if field_ids:
+                table = self.fields[f].table
                 lm = table.link_map
                 id_link_map = {fid:lm.get(fid) for fid in field_ids}
                 vm = table.id_map

src/calibre/srv/metadata.py

@@ -87,6 +87,9 @@ def book_as_json(db, book_id):
         langs = ans.get('languages')
         if langs:
             ans['lang_names'] = {l:calibre_langcode_to_name(l) for l in langs}
+        link_maps = db.get_all_link_maps_for_book(book_id)
+        if link_maps:
+            ans['link_maps'] = link_maps
     return ans
 
 

src/pyj/book_list/book_details.pyj

@@ -190,6 +190,7 @@ def render_metadata(mi, table, book_id, iframe_css):  # {{{
     else:
         fields = filter(allowed_fields, fields)
     comments = v'[]'
+    link_maps = mi.link_maps or v'{}'
 
     def add_row(field, name, val, is_searchable=False, is_html=False, join=None, search_text=None, use_quotes=True):
         if val is undefined or val is None:
@@ -199,18 +200,25 @@ def render_metadata(mi, table, book_id, iframe_css):  # {{{
         def add_val(v):
             if not v.appendChild:
                 v += ''
+            parent = table.lastChild.lastChild
             if is_searchable:
                 text_rep = search_text or v
-                table.lastChild.lastChild.appendChild(E.a(
+                parent.appendChild(E.a(
                     v,
                     title=_('Click to see books with {0}: {1}').format(name, text_rep), class_='blue-link',
                     href=href_for_search(is_searchable, text_rep, use_quotes=use_quotes)
                 ))
+                if link_maps[field] and link_maps[field][text_rep]:
+                    url = link_maps[field][text_rep]
+                    if url.startswith('https://') or url.startswith('http://'):
+                        parent.appendChild(document.createTextNode(' '))
+                        parent.appendChild(E.a(
+                            svgicon('external-link'), title=_('Click to open') + ': ' + url, href=url, target='_new', class_='blue-link'))
             else:
                 if v.appendChild:
-                    table.lastChild.lastChild.appendChild(v)
+                    parent.appendChild(v)
                 else:
-                    table.lastChild.lastChild.appendChild(document.createTextNode(v))
+                    parent.appendChild(document.createTextNode(v))
 
         table.appendChild(E.tr(E.td(name + ':'), E.td()))
         if is_html and /[<>]/.test(val + ''):