dmitrygusev · October 14, 2013 18:51 · Oct 14, 2013
diff --git a/AppModule.java b/AppModule.java
@@ -0,0 +1,17 @@
+//  Here is how I use it in my AppModule.java, note there may be no any HTTP Request when this code executing:
+
+import xxx.web.pages.oauth.Callback;
+
+// ...
+
+    @Contribute(OAuthServiceCatalog.class)
+    public void contributeOAuthServices(MappedConfiguration<String, OAuthServiceConfig> configuration,
+            // ...
+            OfflineLinkSource offlineLinkSource)
+    {
+        //  ...
+        Link callback = offlineLinkSource.createPageRenderLink(Callback.class);
+        callback.addParameter(Button.SERVICE, XXX_EXTERNAL_SYSTEM);
+
+        String uri = callback.toAbsoluteURI();
+        // ...
diff --git a/OfflineLinkSource.java b/OfflineLinkSource.java
@@ -0,0 +1,62 @@
+package com.anjlab.tapestry5.services;
+
+import org.apache.tapestry5.Link;
+import org.apache.tapestry5.SymbolConstants;
+import org.apache.tapestry5.internal.services.LinkImpl;
+import org.apache.tapestry5.ioc.annotations.Inject;
+import org.apache.tapestry5.ioc.annotations.Symbol;
+import org.apache.tapestry5.services.BaseURLSource;
+import org.apache.tapestry5.services.ComponentClassResolver;
+
+public class OfflineLinkSource
+{
+    public static final String SERVICE_ID = "OfflineLinkSource";
+
+    private @Inject @Symbol(SymbolConstants.SECURE_ENABLED) boolean secureEnabled;
+
+    private @Inject BaseURLSource baseURLSource;
+
+    private @Inject ComponentClassResolver resolver;
+
+    public Link createPageRenderLink(final String pageName)
+    {
+        return new LinkImpl("/", false, null, null, null, null)
+        {
+            @Override
+            public String toAbsoluteURI()
+            {
+                StringBuilder builder = new StringBuilder(baseURLSource.getBaseURL(secureEnabled))
+                    .append('/')
+                    .append(resolver.canonicalizePageName(pageName).toLowerCase());
+
+                String sep = "?";
+
+                for (String name : getParameterNames())
+                {
+                    String[] values = getParameterValues(name);
+
+                    for (String value : values)
+                    {
+                        builder.append(sep);
+
+                        // We assume that the name is URL safe and that the value will already have been URL
+                        // encoded if it is not known to be URL safe.
+
+                        builder.append(name);
+                        builder.append("=");
+                        builder.append(value);
+
+                        sep = "&";
+                    }
+                }
+
+                return builder.toString();
+            }
+        };
+    }
+
+    public Link createPageRenderLink(Class<?> pageClass)
+    {
+        return createPageRenderLink(resolver.resolvePageClassNameToPageName(pageClass.getName()));
+    }
+}