JPlatform URL Media template JSP allowing any URL with a valid oEmbed provider to be inserted and displayed in Jalios JPlatform

jplatform-oembed.properties

# 1. Copy JSP in your JPlatform webapp
# 2. Declare this JPlatform URL media template with the following properties (adapte th JSP path) :

# oEmbed
media.template.default.URL.zzz-oEmbed.enabled:   true
media.template.default.URL.zzz-oEmbed.regex:     .*
media.template.default.URL.zzz-oEmbed.jsp:       /jcore/media/url/mediaTemplateOEmbed.jsp

mediaTemplateOEmbed.jsp

<%--
  @Summary: Very naive implementation to render URL using oEmbed endpoints 
  see https://oembed.com/
--%><%@ page import="com.fasterxml.jackson.databind.JsonNode" %><%
%><%@ page import="com.fasterxml.jackson.databind.ObjectMapper" %><%
%><%@ page import="java.util.regex.Matcher" %><%
%><%@ page import="java.util.regex.Pattern" %><%
%><%@ include file='/jcore/doInitPage.jspf' %><%
%><%@ include file='/jcore/media/mediaTemplateInit.jspf' %><%!

  final String OEMBED_PROVIDERS_JSON_URL = "https://oembed.com/providers.json";
  final ObjectMapper oEmbedMapper = new ObjectMapper();
  
  JsonNode oEmbedProviders = null;

%><%
  if (Util.isEmpty(url)){
    return;
  }

  // Lazy initialization of providers list
  if (oEmbedProviders == null) {
    try {
      oEmbedProviders = oEmbedMapper.readTree(new URL(OEMBED_PROVIDERS_JSON_URL));
    } catch (Exception ex) {
      logger.warn("Could not retrieve oEmbed providers list", ex);
    }
  }

  // 
  if (oEmbedProviders == null) {
    return;
  }
  String html = null;
  for (JsonNode provider : oEmbedProviders) {
    final String providerName = provider.get("provider_name").asText();
    final String providerUrl = provider.get("provider_url").asText();
    final JsonNode providerEndpoints = provider.get("endpoints");
    if (providerEndpoints != null) {
      for (JsonNode providerEndpoint : providerEndpoints) {
        final String endpointUrl = providerEndpoint.get("url").asText();
        final JsonNode endpointSchemes = providerEndpoint.get("schemes");
        boolean match = false;
        if (endpointSchemes != null) {
          for (JsonNode endpointScheme : endpointSchemes) {
            final String scheme = Util.getString(endpointScheme.asText(), "");
            final String schemeJavaRegex = "^" + scheme.replace(".", "\\.").replace("*", ".*") + "$"; // very naive impl
            if (url.matches(schemeJavaRegex)) {
              if (logger.isDebugEnabled()) {
                logger.debug("URL matches provider " + providerName + " at " + providerUrl + ". Use endpoint " + endpointUrl);
              }
              match = true;
              break;
            }
          }
        }
        if (match) {
          try {
            URL oembedURL = new URL(endpointUrl+"?url="+ServletUtil.encodeURL(url));
            JsonNode oembed = oEmbedMapper.readTree(oembedURL);
            html = oembed.get("html").asText();
          } catch (Exception ex) {
            logger.warn("Could not contact/parse oEmbed endpoint " + endpointUrl + " for URL" +url, ex);
          }
          break;
        }
      }
    }
    
    if (html != null) {
      break;
    }
  }
  if (html == null) {
    %><a href="<%= encodeForHTMLAttribute(url) %>"><%= encodeForHTML(url) %></a><%
    return;
  }
%><%= html %>