Platform Explorer / Nuxeo Platform 2021.48

Component org.nuxeo.ecm.core.io.download.DownloadService

In bundle org.nuxeo.ecm.core.io

Documentation

Manages repositories.

Requirements

Resolution Order

148
The resolution order represents the order in which this component has been resolved by the Nuxeo Runtime framework.
You can influence this order by adding "require" tags in your component declaration, to make sure it is resolved after another component.

Start Order

820
The start order represents the order in which this component has been started by the Nuxeo Runtime framework.
This number is interesting to tweak if your Java component interacts with other components, and needs to be started before or after another one.
It can be changed by implementing the method "Component#getApplicationStartedOrder()" on your Java component: components are sorted according to this reference value, in increasing order.
The default value is 1000, and the repository initialization uses number 100. Negative values can also be used.

Implementation

Class: org.nuxeo.ecm.core.io.download.DownloadServiceImpl

Services

Extension Points

Contributions

XML Source

<?xml version="1.0"?>
<component name="org.nuxeo.ecm.core.io.download.DownloadService">

  <documentation>
    Manages repositories.
  </documentation>

  <require>org.nuxeo.ecm.core.transientstore.TransientStorageComponent</require>

  <implementation class="org.nuxeo.ecm.core.io.download.DownloadServiceImpl" />

  <service>
    <provide interface="org.nuxeo.ecm.core.io.download.DownloadService" />
  </service>

  <extension-point name="permissions">

    <documentation>
      Defines the permissions associated to blob download. Contributions are of the form:
      <code>
        <permission name="myperm">
          <script language="JavaScript">
            function run() {
              if (CurrentUser.getName() != "bob") {
                return false;
              }
              if (!CurrentUser.getGroups().contains("members")) {
                return false;
              }
              if (Document.getPropertyValue("dc:format") != "pdf") {
                return false;
              }
              if (Reason != "rendition") {
                return false;
              }
              if (Rendition != "myrendition") {
                return false;
              }
              if (Blob.getFilename() != "myfile.txt") {
                return false;
              }
              if (XPath == "file:content" || XPath == "blobholder:0") {
                return false;
              }
              return true;
          </script>
        </permission>
      </code>
      The language can be any JVM scripting language, the default is "JavaScript".

      The script must define a "run()" function that returns a boolean:
      - true means that downloading the blob is not disallowed by this permission.
      - false means that downloading the blob is forbidden.
      The method will get called with the following global context (some values may be null):
      Document (DocumentModel), XPath (String), Blob (Blob), CurrentUser (NuxeoPrincipal),
      Reason (String), Rendition (String), Infos (Map).

      If there are several permissions defined, a single one returning false is sufficient
      to forbid the blob download.
    </documentation>

    <object class="org.nuxeo.ecm.core.io.download.DownloadPermissionDescriptor"/>

  </extension-point>

  <extension-point name="redirectResolver">

    <documentation>
      Defines the redirect resolver associated to blob download. Contributions are of the form:
      <code>
        <redirectResolver class="org.nuxeo.ecm.core.io.download.DefaultRedirectResolver"></redirectResolver>
      </code>
      This allows you to redirect to a specific cache server or by default the blobManager redirect mechanism
    </documentation>

    <object class="org.nuxeo.ecm.core.io.download.RedirectResolverDescriptor"/>

  </extension-point>

  <extension target="org.nuxeo.runtime.ConfigurationService" point="configuration">
    <documentation>
      Property that enables returning blob URLs with redirections already taken into account.
      Only applies to code calling the DownloadService.getFullDownloadUrl API.
    </documentation>
    <property name="org.nuxeo.download.url.follow.redirect">${org.nuxeo.download.url.follow.redirect:=false}</property>
  </extension>

  <extension target="org.nuxeo.ecm.core.transientstore.TransientStorageComponent" point="store">
    <!-- Explicit declaration based on default configuration to enforce GC -->
    <store name="download" />
  </extension>

</component>