/**
* appends memento timegate link to all resources, that are accessed via GET on resource
* webservice
*
* @param servletRequest
* @param servletResponse
* @param filterChain
* @throws IOException
* @throws ServletException
*/
@Override
public void doFilter(
ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
if (servletRequest instanceof HttpServletRequest) {
HttpServletRequest request = (HttpServletRequest) servletRequest;
// memento is only for reading
if (request.getMethod().equals("GET") || request.getMethod().equals("HEAD")) {
HttpServletResponse response = (HttpServletResponse) servletResponse;
URL resource = getResourceURL(request);
// build timegate link
if (resource != null) {
response.addHeader(
"Link",
"<"
+ MementoUtils.timegateURI(resource.toString(), configurationService.getBaseUri())
+ ">; rel=\"timegate\","
+ "<"
+ MementoUtils.timemapURI(resource.toString(), configurationService.getBaseUri())
+ ">; rel=\"timemap\"");
}
filterChain.doFilter(servletRequest, response);
return;
}
}
filterChain.doFilter(servletRequest, servletResponse);
}
/**
* writes serialized version list (text/html) to output stream
*
* @param original the original (current) resource
* @param versions a list of versions in ascending order
* @param out an output stream
*/
@Override
public void write(Resource original, RepositoryResult<Version> versions, OutputStream out)
throws IOException {
try {
// write data to map
Map<String, Object> data = new HashMap<String, Object>();
data.put("original", original.toString());
List<Map<String, String>> vs = new ArrayList<Map<String, String>>();
while (versions.hasNext()) {
Version v = versions.next();
Map<String, String> m = new HashMap<String, String>();
m.put("date", v.getCommitTime().toString());
m.put(
"uri",
MementoUtils.resourceURI(
original.toString(), v.getCommitTime(), configurationService.getBaseUri())
.toString());
m.put("tstamp", TSTAMP.format(v.getCommitTime()));
vs.add(m);
}
data.put("versions", vs);
// put generic data
String project = configurationService.getStringConfiguration("kiwi.pages.project", "lmf");
data.put(
"LOGO",
configurationService.getStringConfiguration(
"kiwi.pages.project." + project + ".logo", "logo.png"));
data.put(
"FOOTER",
configurationService.getStringConfiguration(
"kiwi.pages.project." + project + ".footer", "a footer"));
data.put("SERVER_URL", configurationService.getServerUri());
data.put("baseUri", configurationService.getServerUri());
// create writer
OutputStreamWriter writer = new OutputStreamWriter(out);
// process
templatingService.process(this.getClass(), TEMPLATE, data, writer);
// flush and close writer
writer.flush();
writer.close();
} catch (RepositoryException e) {
throw new IOException("cannot serialize versions in text/html format");
} catch (TemplateException e) {
throw new IOException("cannot finish templating");
}
}
