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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package freemarker.ext.servlet;
import java.io.IOException;
import java.io.Writer;
import java.nio.charset.Charset;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Enumeration;
import java.util.GregorianCalendar;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.regex.Pattern;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import freemarker.cache.ClassTemplateLoader;
import freemarker.cache.FileTemplateLoader;
import freemarker.cache.MultiTemplateLoader;
import freemarker.cache.TemplateLoader;
import freemarker.cache.WebappTemplateLoader;
import freemarker.core.Configurable;
import freemarker.core.Environment;
import freemarker.core.OutputFormat;
import freemarker.core.UndefinedOutputFormat;
import freemarker.ext.jsp.TaglibFactory;
import freemarker.ext.jsp.TaglibFactory.ClasspathMetaInfTldSource;
import freemarker.ext.jsp.TaglibFactory.ClearMetaInfTldSource;
import freemarker.ext.jsp.TaglibFactory.MetaInfTldSource;
import freemarker.ext.jsp.TaglibFactory.WebInfPerLibJarMetaInfTldSource;
import freemarker.log.Logger;
import freemarker.template.Configuration;
import freemarker.template.ObjectWrapper;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import freemarker.template.TemplateExceptionHandler;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateNotFoundException;
import freemarker.template.utility.SecurityUtilities;
import freemarker.template.utility.StringUtil;
/**
* FreeMarker MVC View servlet that can be used similarly to JSP views. That is, you put the variables to expose into
* HTTP servlet request attributes, then forward to an FTL file (instead of to a JSP file) that's mapped to this servet
* (usually via the {@code *.ftl}). See web.xml example (and more) in the FreeMarker Manual!
*
*
*
* Main features
*
*
*
*
*
* - It makes all request, request parameters, session, and servlet context attributes available to templates through
*
Request, RequestParameters, Session, and Application variables.
*
* - The scope variables are also available via automatic scope discovery. That is, writing
*
Application.attrName, Session.attrName, Request.attrName is not mandatory;
* it's enough to write attrName, and if no such variable was created in the template, it will search the
* variable in Request, and then in Session, and finally in Application.
*
* - It creates a variable with name
JspTaglibs that can be used to load JSP taglibs. For example:
* <#assign dt=JspTaglibs["http://displaytag.sf.net"]> or
* <#assign tiles=JspTaglibs["/WEB-INF/struts-tiles.tld"]>.
*
* - A custom directive named {@code include_page} allows you to include the output of another servlet resource from
* your servlet container, just as if you used {@code ServletRequest.getRequestDispatcher(path).include()}: {@code
* <@include_page path="/myWebapp/somePage.jsp"/>}. You can also pass parameters to the newly included page by passing a
* hash named {@code params}:
*
<@include_page path="/myWebapp/somePage.jsp" params= lang: "en", q="5"}/>. By default, the request
* parameters of the original request (the one being processed by FreemarkerServlet) are also inherited by the include.
* You can explicitly control this inheritance using the {@code inherit_params} parameter:
* <@include_page path="/myWebapp/somePage.jsp" params={lang: "en", q="5"} inherit_params=false/>.
*
*
*
*
*
* Supported {@code init-param}-s
*
*
*
*
*
* - {@value #INIT_PARAM_TEMPLATE_PATH}: Specifies the location of the template files. By default,
* this is interpreted as a {@link ServletContext} resource path, which practically means a web application directory
* relative path, or a {@code WEB-INF/lib/*.jar/META-INF/resources}-relative path (note that this last haven't always
* worked before FreeMarker 2.3.23).
* Alternatively, you can prepend it with file:// to indicate a literal path in the file system (i.e.
* file:///var/www/project/templates/). Note that three slashes were used to specify an absolute path.
* Also, you can prepend it with {@code classpath:}, like in classpath:com/example/templates, to indicate that
* you want to load templates from the specified package accessible through the Thread Context Class Loader of the
* thread that initializes this servlet.
* If {@code incompatible_improvements} is set to 2.3.22 (or higher), you can specify multiple comma separated locations
* inside square brackets, like: {@code [ WEB-INF/templates, classpath:com/example/myapp/templates ]}. This internally
* creates a {@link MultiTemplateLoader}. Note again that if {@code incompatible_improvements} isn't set to at least
* 2.3.22, the initial {@code [} has no special meaning, and so this feature is unavailable.
* Any of the above can have a {@code ?setting(name=value, ...)} postfix to set the JavaBeans properties of the
* {@link TemplateLoader} created. For example,
* {@code /templates?settings(attemptFileAccess=false, URLConnectionUsesCaches=true)} calls
* {@link WebappTemplateLoader#setAttemptFileAccess(boolean)} and
* {@link WebappTemplateLoader#setURLConnectionUsesCaches(Boolean)} to tune the {@link WebappTemplateLoader}. For
* backward compatibility (not recommended!), you can use the {@code class://} prefix, like in
* class://com/example/templates format, which is similar to {@code classpath:}, except that it uses the
* defining class loader of this servlet's class. This can cause template-not-found errors, if that class (in
* {@code freemarer.jar} usually) is not local to the web application, while the templates are.
* The default value is class:// (that is, the root of the class hierarchy), which is not recommended anymore,
* and should be overwritten with the {@value #INIT_PARAM_TEMPLATE_PATH} init-param.
*
* - {@value #INIT_PARAM_NO_CACHE}: If set to {@code true}, generates headers in the response that
* advise the HTTP client not to cache the returned page. If {@code false}, the HTTP response is not modified for this
* purpose. The default is {@code false}.
*
* - {@value #INIT_PARAM_CONTENT_TYPE}: The Content-type HTTP header value used in the HTTP responses
* when nothing else specifies the MIME type. The things that may specify the MIME type (and hence this init-param is
* ignored), starting with the highest precedence, are:
*
* - If the {@value #INIT_PARAM_OVERRIDE_RESPONSE_CONTENT_TYPE} init-param is {@value #INIT_PARAM_VALUE_NEVER} (the
* default is {@value #INIT_PARAM_VALUE_ALWAYS}), then the value of {@link HttpServletResponse#getContentType()} is used
* if that's non-{@code null}.
*
- The template's content_type custom attribute, usually specified via the attributes parameter of
* the <#ftl> directive. This is a legacy feature, deprecated by the {@link OutputFormat} mechanism.
*
- The {@linkplain Template#getOutputFormat() output format of the template}, if that has non-{@code null} MIME-type
* ({@link OutputFormat#getMimeType()}). When a template has no output format specified, {@link UndefinedOutputFormat}
* is used, which has {@code null} MIME-type. (The output format of a template is deduced from {@link Configuration}
* settings, or can be specified directly in the template, like {@code <#ftl outputFormat="HTML">}. See the FreeMarker
* Manual for more about the output format mechanism. Note that setting an output format may turns on auto-escaping, so
* it's not just about MIME types.)
*
- If the {@value #INIT_PARAM_OVERRIDE_RESPONSE_CONTENT_TYPE} init-param is not {@value #INIT_PARAM_VALUE_ALWAYS}
* (the default is {@value #INIT_PARAM_VALUE_ALWAYS}), then the value of {@link HttpServletResponse#getContentType()} is
* used if that's non-{@code null}.
*
* If none of the above gives a MIME type, then this init-param does. Defaults to "text/html". If and only if
* the {@value #INIT_PARAM_RESPONSE_CHARACTER_ENCODING} init-param is set to {@value #INIT_PARAM_VALUE_LEGACY} (which is
* the default of it), the content type may include the charset (as in "text/html; charset=utf-8"), in which
* case that specifies the actual charset of the output. If the the {@value #INIT_PARAM_RESPONSE_CHARACTER_ENCODING}
* init-param is not set to {@value #INIT_PARAM_VALUE_LEGACY}, then specifying the charset in the
* {@value #INIT_PARAM_CONTENT_TYPE} init-param is not allowed, and will cause servlet initialization error.
*
* - {@value #INIT_PARAM_OVERRIDE_RESPONSE_CONTENT_TYPE} (since 2.3.24): Specifies when we should
* override the {@code contentType} that might be already set (i.e., non-{@code null}) in the
* {@link HttpServletResponse}. The default is {@value #INIT_PARAM_VALUE_ALWAYS}, which means that we always set the
* content type. Another possible value is {@value #INIT_PARAM_VALUE_NEVER}, which means that we don't set the content
* type in the response, unless {@link HttpServletResponse#getContentType()} is {@code null}. The third possible value
* is {@value #INIT_PARAM_VALUE_WHEN_TEMPLATE_HAS_MIME_TYPE}, which means that we only set the content type if either
* the template has an associated {@link OutputFormat} with non-{@code null} {@link OutputFormat#getMimeType()}, or it
* has a custom attribute with name content_type, or {@link HttpServletResponse#getContentType()} is
* {@code null}. Setting this init-param allows you to specify the content type before forwarding to
* {@link FreemarkerServlet}.
*
* - {@value #INIT_PARAM_OVERRIDE_RESPONSE_LOCALE} (since 2.3.24): Specifies if we should override
* the template {@code locale} that might be already set (i.e., non-{@code null}) in the {@link HttpServletRequest}. The
* default is {@value #INIT_PARAM_VALUE_ALWAYS}, which means that we always deduce the template {@code locale} by
* invoking {@link #deduceLocale(String, HttpServletRequest, HttpServletResponse)}. Another possible value is
* {@value #INIT_PARAM_VALUE_NEVER}, which means that we don't deduce the template {@code locale}, unless
* {@link HttpServletRequest#getLocale()} is {@code null}.
*
*
- {@value #INIT_PARAM_RESPONSE_CHARACTER_ENCODING} (since 2.3.24): Specifies how the
* {@link HttpServletResponse} "character encoding" (as in {@link HttpServletResponse#setCharacterEncoding(String)})
* will be deduced. The possible modes are:
*
* - {@value #INIT_PARAM_VALUE_LEGACY}: This is the default for backward compatibility; in new applications, use
* {@value #INIT_PARAM_VALUE_FROM_TEMPLATE} (or some of the other options) instead. {@value #INIT_PARAM_VALUE_LEGACY}
* will use the charset of the template file to set the charset of the servlet response. Except, if the
* {@value #INIT_PARAM_CONTENT_TYPE} init-param contains a charset, it will use that instead. A quirk of this legacy
* mode is that it's not aware of the {@link Configurable#getOutputEncoding()} FreeMarker setting, and thus never reads
* or writes it (though very few applications utilize that setting anyway). Also, it sets the charset of the servlet
* response by adding it to the response content type via calling {@link HttpServletResponse#setContentType(String)} (as
* that was the only way before Servlet 2.4), not via the more modern
* {@link HttpServletResponse#setCharacterEncoding(String)} method. Note that the charset of a template usually comes
* from {@link Configuration#getDefaultEncoding()} (i.e., from the {@code default_encoding} FreeMarker setting),
* occasionally from {@link Configuration#getEncoding(Locale)} (when FreeMarker was configured to use different charsets
* depending on the locale) or even more rarely from {@link Configuration#getTemplateConfigurations()} (when FreeMarker was
* configured to use a specific charset for certain templates).
*
- {@value #INIT_PARAM_VALUE_FROM_TEMPLATE}: This should be used in most applications, but it's not the default for
* backward compatibility. It reads the {@link Configurable#getOutputEncoding()} setting of the template (note that the
* template usually just inherits that from the {@link Configuration}), and if that's not set, then reads the source
* charset of the template, just like {@value #INIT_PARAM_VALUE_LEGACY}. Then it passes the charset acquired this way to
* {@link HttpServletResponse#setCharacterEncoding(String)} and {@link Environment#setOutputEncoding(String)}. (It
* doesn't call the legacy {@link HttpServletResponse#setContentType(String)} API to set the charset.) (Note that if the
* template has a {@code content_type} template attribute (which is deprecated) that specifies a charset, it will be
* used as the output charset of that template.)
*
- {@value #INIT_PARAM_VALUE_DO_NOT_SET}: {@link FreemarkerServlet} will not set the {@link HttpServletResponse}
* "character encoding". It will still call {@link Environment#setOutputEncoding(String)}, so that the running template
* will be aware of the charset used for the output.
*
- {@value #INIT_PARAM_VALUE_FORCE_PREFIX} + charset name, for example {@code force UTF-8}: The output charset will
* be the one specified after "force" + space, regardless of everything. The charset specified this way is passed to
* {@link HttpServletResponse#setCharacterEncoding(String)} and {@link Environment#setOutputEncoding(String)}. If the
* charset name is not recognized by Java, the servlet initialization will fail.
*
*
* - {@value #INIT_PARAM_BUFFER_SIZE}: Sets the size of the output buffer in bytes, or if "KB" or
* "MB" is written after the number (like {@code
256 KB }) then in kilobytes or megabytes.
* This corresponds to {@link HttpServletResponse#setBufferSize(int)}. If the {@link HttpServletResponse} state doesn't
* allow changing the buffer size, it will silently do nothing. If this init param isn't specified, then the buffer size
* is not set by {@link FreemarkerServlet} in the HTTP response, which usually means that the default buffer size of the
* servlet container will be used.
*
* - {@value #INIT_PARAM_EXCEPTION_ON_MISSING_TEMPLATE} (since 2.3.22): If {@code false} (default,
* but not recommended), if a template is requested that's missing, this servlet responses with a HTTP 404 "Not found"
* error, and only logs the problem with debug level. If {@code true} (recommended), the servlet will log the issue with
* error level, then throws an exception that bubbles up to the servlet container, which usually then creates a HTTP 500
* "Internal server error" response (and maybe logs the event into the container log). See "Error handling" later for
* more!
*
* - {@value #INIT_PARAM_META_INF_TLD_LOCATIONS} (since 2.3.22): Comma separated list of items, each
* is either {@value #META_INF_TLD_LOCATION_WEB_INF_PER_LIB_JARS}, or {@value #META_INF_TLD_LOCATION_CLASSPATH}
* optionally followed by colon and a regular expression, or {@value #META_INF_TLD_LOCATION_CLEAR}. For example {@code
*
classpath:.*myoverride.*\.jar$, webInfPerLibJars, classpath:.*taglib.*\.jar$ }, or {@code
* classpath }. (Whitespace around the commas and list items will be ignored.) See
* {@link TaglibFactory#setMetaInfTldSources(List)} for more information. Defaults to a list that contains
* {@value #META_INF_TLD_LOCATION_WEB_INF_PER_LIB_JARS} only (can be overridden with
* {@link #createDefaultMetaInfTldSources()}). Note that this can be also specified with the
* {@value #SYSTEM_PROPERTY_META_INF_TLD_SOURCES} system property. If both the init-param and the system property
* exists, the sources listed in the system property will be added after those specified by the init-param. This is
* where the special entry, {@value #META_INF_TLD_LOCATION_CLEAR} comes handy, as it will remove all previous list
* items. (An intended usage of the system property is setting it to {@code clear, classpath} in the Eclipse run
* configuration if you are running the application without putting the dependency jar-s into {@code WEB-INF/lib}.)
* Also, note that further {@code classpath:} items are added automatically at the end of this list based on
* Jetty's {@code "org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern"} servlet context attribute.
*
* - {@value #INIT_PARAM_CLASSPATH_TLDS} (since 2.3.22): Comma separated list of paths; see
* {@link TaglibFactory#setClasspathTlds(List)}. Whitespace around the list items will be ignored. Defaults to no paths
* (can be overidden with {@link #createDefaultClassPathTlds()}). Note that this can also be specified with the
* {@value #SYSTEM_PROPERTY_CLASSPATH_TLDS} system property. If both the init-param and the system property exists, the
* items listed in system property will be added after those specified by the init-param.
*
* - "Debug": Deprecated, has no effect since 2.3.22. (Earlier it has enabled/disabled sending
* debug-level log messages to the servlet container log, but this servlet doesn't log debug level messages into the
* servlet container log anymore, only into the FreeMarker log.)
*
* - The following init-params are supported only for backward compatibility, and their usage is discouraged:
* {@code TemplateUpdateInterval}, {@code DefaultEncoding}, {@code ObjectWrapper}, {@code TemplateExceptionHandler}.
* Instead, use init-params with the setting names documented at {@link Configuration#setSetting(String, String)}, such
* as {@code object_wrapper}.
*
*
- Any other init-params will be interpreted as {@link Configuration}-level FreeMarker setting. See
* the possible names and values at {@link Configuration#setSetting(String, String)}. Note that these init-param names
* are starting with lower-case letter (upper-case init-params are used for FreemarkerSerlvet settings).
*
*
*
*
*
* Error handling
*
*
*
*
* Notes:
*
*
*
*
* - Logging below, where not said otherwise, always refers to logging with FreeMarker's logging facility (see
* {@link Logger}), under the "freemarker.servlet" category.
* - Throwing a {@link ServletException} to the servlet container is mentioned at a few places below. That in practice
* usually means HTTP 500 "Internal server error" response, and maybe a log entry in the servlet container's log.
*
*
*
* Errors types:
*
*
*
*
* - If the servlet initialization fails, the servlet won't be started as usual. The cause is usually logged with
* error level. When it isn't, check the servlet container's log.
*
*
- If the requested template doesn't exist, by default the servlet returns a HTTP 404 "Not found" response, and logs
* the problem with debug level. Responding with HTTP 404 is how JSP behaves, but it's actually not a
* recommended setting anymore. By setting {@value #INIT_PARAM_EXCEPTION_ON_MISSING_TEMPLATE} init-param to {@code true}
* (recommended), it will instead log the problem with error level, then the servlet throws {@link ServletException} to
* the servlet container (with the proper cause exception). After all, if the visited URL had an associated "action" but
* the template behind it is missing, that's an internal server error, not a wrong URL.
*
* - If the template contains parsing errors, it will log it with error level, then the servlet throws
* {@link ServletException} to the servlet container (with the proper cause exception).
*
* - If the template throws exception during its execution, and the value of the {@code template_exception_handler}
* init-param is {@code rethrow} (recommended), it will log it with error level and then the servlet throws
* {@link ServletException} to the servlet container (with the proper cause exception). But beware, the default value of
* the {@code template_exception_handler} init-param is {@code html_debug}, which is for development only! Set it to
* {@code rethrow} for production. The {@code html_debug} (and {@code debug}) handlers will print error details to the
* page and then commit the HTTP response with response code 200 "OK", thus, the server wont be able roll back the
* response and send back an HTTP 500 page. This is so that the template developers will see the error without digging
* the logs.
*
*
*/
public class FreemarkerServlet extends HttpServlet {
private static final Logger LOG = Logger.getLogger("freemarker.servlet");
private static final Logger LOG_RT = Logger.getLogger("freemarker.runtime");
public static final long serialVersionUID = -2440216393145762479L;
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params. (This init-param
* has existed long before 2.3.22, but this constant was only added then.)
*
* @since 2.3.22
*/
public static final String INIT_PARAM_TEMPLATE_PATH = "TemplatePath";
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params. (This init-param
* has existed long before 2.3.22, but this constant was only added then.)
*
* @since 2.3.22
*/
public static final String INIT_PARAM_NO_CACHE = "NoCache";
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params. (This init-param
* has existed long before 2.3.22, but this constant was only added then.)
*
* @since 2.3.22
*/
public static final String INIT_PARAM_CONTENT_TYPE = "ContentType";
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params.
*
* @since 2.3.24
*/
public static final String INIT_PARAM_OVERRIDE_RESPONSE_CONTENT_TYPE = "OverrideResponseContentType";
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params.
*
* @since 2.3.24
*/
public static final String INIT_PARAM_RESPONSE_CHARACTER_ENCODING = "ResponseCharacterEncoding";
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params.
*
* @since 2.3.24
*/
public static final String INIT_PARAM_OVERRIDE_RESPONSE_LOCALE = "OverrideResponseLocale";
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params.
*
* @since 2.3.22
*/
public static final String INIT_PARAM_BUFFER_SIZE = "BufferSize";
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params.
*
* @since 2.3.22
*/
public static final String INIT_PARAM_META_INF_TLD_LOCATIONS = "MetaInfTldSources";
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params.
*
* @since 2.3.22
*/
public static final String INIT_PARAM_EXCEPTION_ON_MISSING_TEMPLATE = "ExceptionOnMissingTemplate";
/**
* Init-param name - see the {@link FreemarkerServlet} class documentation about the init-params.
*
* @since 2.3.22
*/
public static final String INIT_PARAM_CLASSPATH_TLDS = "ClasspathTlds";
private static final String INIT_PARAM_DEBUG = "Debug";
private static final String DEPR_INITPARAM_TEMPLATE_DELAY = "TemplateDelay";
private static final String DEPR_INITPARAM_ENCODING = "DefaultEncoding";
private static final String DEPR_INITPARAM_OBJECT_WRAPPER = "ObjectWrapper";
private static final String DEPR_INITPARAM_WRAPPER_SIMPLE = "simple";
private static final String DEPR_INITPARAM_WRAPPER_BEANS = "beans";
private static final String DEPR_INITPARAM_WRAPPER_JYTHON = "jython";
private static final String DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER = "TemplateExceptionHandler";
private static final String DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER_RETHROW = "rethrow";
private static final String DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER_DEBUG = "debug";
private static final String DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER_HTML_DEBUG = "htmlDebug";
private static final String DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER_IGNORE = "ignore";
private static final String DEPR_INITPARAM_DEBUG = "debug";
private static final ContentType DEFAULT_CONTENT_TYPE = new ContentType("text/html");
public static final String INIT_PARAM_VALUE_NEVER = "never";
public static final String INIT_PARAM_VALUE_ALWAYS = "always";
public static final String INIT_PARAM_VALUE_WHEN_TEMPLATE_HAS_MIME_TYPE = "whenTemplateHasMimeType";
public static final String INIT_PARAM_VALUE_FROM_TEMPLATE = "fromTemplate";
public static final String INIT_PARAM_VALUE_LEGACY = "legacy";
public static final String INIT_PARAM_VALUE_DO_NOT_SET = "doNotSet";
public static final String INIT_PARAM_VALUE_FORCE_PREFIX = "force ";
/**
* When set, the items defined in it will be added after those coming from the
* {@value #INIT_PARAM_META_INF_TLD_LOCATIONS} init-param. The value syntax is the same as of the init-param. Note
* that {@value #META_INF_TLD_LOCATION_CLEAR} can be used to re-start the list, rather than continue it.
*
* @since 2.3.22
*/
public static final String SYSTEM_PROPERTY_META_INF_TLD_SOURCES = "org.freemarker.jsp.metaInfTldSources";
/**
* When set, the items defined in it will be added after those coming from the
* {@value #INIT_PARAM_CLASSPATH_TLDS} init-param. The value syntax is the same as of the init-param.
*
* @since 2.3.22
*/
public static final String SYSTEM_PROPERTY_CLASSPATH_TLDS = "org.freemarker.jsp.classpathTlds";
/**
* Used as part of the value of the {@value #INIT_PARAM_META_INF_TLD_LOCATIONS} init-param.
*
* @since 2.3.22
*/
public static final String META_INF_TLD_LOCATION_WEB_INF_PER_LIB_JARS = "webInfPerLibJars";
/**
* Used as part of the value of the {@value #INIT_PARAM_META_INF_TLD_LOCATIONS} init-param.
*
* @since 2.3.22
*/
public static final String META_INF_TLD_LOCATION_CLASSPATH = "classpath";
/**
* Used as part of the value of the {@value #INIT_PARAM_META_INF_TLD_LOCATIONS} init-param.
*
* @since 2.3.22
*/
public static final String META_INF_TLD_LOCATION_CLEAR = "clear";
public static final String KEY_REQUEST = "Request";
public static final String KEY_INCLUDE = "include_page";
public static final String KEY_REQUEST_PRIVATE = "__FreeMarkerServlet.Request__";
public static final String KEY_REQUEST_PARAMETERS = "RequestParameters";
public static final String KEY_SESSION = "Session";
public static final String KEY_APPLICATION = "Application";
public static final String KEY_APPLICATION_PRIVATE = "__FreeMarkerServlet.Application__";
public static final String KEY_JSP_TAGLIBS = "JspTaglibs";
// Note these names start with dot, so they're essentially invisible from
// a freemarker script.
private static final String ATTR_REQUEST_MODEL = ".freemarker.Request";
private static final String ATTR_REQUEST_PARAMETERS_MODEL = ".freemarker.RequestParameters";
private static final String ATTR_SESSION_MODEL = ".freemarker.Session";
/** @deprecated We only keeps this attribute for backward compatibility, but actually aren't using it. */
@Deprecated
private static final String ATTR_APPLICATION_MODEL = ".freemarker.Application";
/** @deprecated We only keeps this attribute for backward compatibility, but actually aren't using it. */
@Deprecated
private static final String ATTR_JSP_TAGLIBS_MODEL = ".freemarker.JspTaglibs";
private static final String ATTR_JETTY_CP_TAGLIB_JAR_PATTERNS
= "org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern";
private static final String EXPIRATION_DATE;
static {
// Generate expiration date that is one year from now in the past
GregorianCalendar expiration = new GregorianCalendar();
expiration.roll(Calendar.YEAR, -1);
SimpleDateFormat httpDate =
new SimpleDateFormat(
"EEE, dd MMM yyyy HH:mm:ss z",
java.util.Locale.US);
EXPIRATION_DATE = httpDate.format(expiration.getTime());
}
// Init-param values:
private String templatePath;
private boolean noCache;
private Integer bufferSize;
private boolean exceptionOnMissingTemplate;
/**
* @deprecated Not used anymore; to enable/disable debug logging, just set the logging level of the logging library
* used by {@link Logger}.
*/
@Deprecated
protected boolean debug;
@SuppressFBWarnings(value="SE_BAD_FIELD", justification="Not investing into making this Servlet serializable")
private Configuration config;
@SuppressFBWarnings(value="SE_BAD_FIELD", justification="Not investing into making this Servlet serializable")
private ObjectWrapper wrapper;
private ContentType contentType;
private OverrideResponseContentType overrideResponseContentType = initParamValueToEnum(
getDefaultOverrideResponseContentType(), OverrideResponseContentType.values());
private ResponseCharacterEncoding responseCharacterEncoding = ResponseCharacterEncoding.LEGACY;
@SuppressFBWarnings(value="SE_BAD_FIELD", justification="Not investing into making this Servlet serializable")
private Charset forcedResponseCharacterEncoding;
private OverrideResponseLocale overrideResponseLocale = OverrideResponseLocale.ALWAYS;
private List/**/ metaInfTldSources;
private List/**/ classpathTlds;
private Object lazyInitFieldsLock = new Object();
@SuppressFBWarnings(value="SE_BAD_FIELD", justification="Not investing into making this Servlet serializable")
private ServletContextHashModel servletContextModel;
@SuppressFBWarnings(value="SE_BAD_FIELD", justification="Not investing into making this Servlet serializable")
private TaglibFactory taglibFactory;
private boolean objectWrapperMismatchWarnLogged;
/**
* Don't override this method to adjust FreeMarker settings! Override the protected methods for that, such as
* {@link #createConfiguration()}, {@link #createTemplateLoader(String)}, {@link #createDefaultObjectWrapper()},
* etc. Also note that lot of things can be changed with init-params instead of overriding methods, so if you
* override settings, usually you should only override their defaults.
*/
@Override
public void init() throws ServletException {
try {
initialize();
} catch (Exception e) {
// At least Jetty doesn't log the ServletException itself, only its cause exception. Thus we add some
// message here that (re)states the obvious.
throw new ServletException("Error while initializing " + this.getClass().getName()
+ " servlet; see cause exception.", e);
}
}
private void initialize() throws InitParamValueException, MalformedWebXmlException, ConflictingInitParamsException {
config = createConfiguration();
// Only override what's coming from the config if it was explicitly specified:
final String iciInitParamValue = getInitParameter(Configuration.INCOMPATIBLE_IMPROVEMENTS_KEY);
if (iciInitParamValue != null) {
try {
config.setSetting(Configuration.INCOMPATIBLE_IMPROVEMENTS_KEY, iciInitParamValue);
} catch (Exception e) {
throw new InitParamValueException(Configuration.INCOMPATIBLE_IMPROVEMENTS_KEY, iciInitParamValue, e);
}
}
// Set FreemarkerServlet-specific defaults, except where createConfiguration() has already set them:
if (!config.isTemplateExceptionHandlerExplicitlySet()) {
config.setTemplateExceptionHandler(TemplateExceptionHandler.HTML_DEBUG_HANDLER);
}
if (!config.isLogTemplateExceptionsExplicitlySet()) {
config.setLogTemplateExceptions(false);
}
contentType = DEFAULT_CONTENT_TYPE;
// Process object_wrapper init-param out of order:
wrapper = createObjectWrapper();
if (LOG.isDebugEnabled()) {
LOG.debug("Using object wrapper: " + wrapper);
}
config.setObjectWrapper(wrapper);
// Process TemplatePath init-param out of order:
templatePath = getInitParameter(INIT_PARAM_TEMPLATE_PATH);
if (templatePath == null && !config.isTemplateLoaderExplicitlySet()) {
templatePath = InitParamParser.TEMPLATE_PATH_PREFIX_CLASS;
}
if (templatePath != null) {
try {
config.setTemplateLoader(createTemplateLoader(templatePath));
} catch (Exception e) {
throw new InitParamValueException(INIT_PARAM_TEMPLATE_PATH, templatePath, e);
}
}
metaInfTldSources = createDefaultMetaInfTldSources();
classpathTlds = createDefaultClassPathTlds();
// Process all other init-params:
Enumeration initpnames = getServletConfig().getInitParameterNames();
while (initpnames.hasMoreElements()) {
final String name = (String) initpnames.nextElement();
final String value = getInitParameter(name);
if (name == null) {
throw new MalformedWebXmlException(
"init-param without param-name. "
+ "Maybe the web.xml is not well-formed?");
}
if (value == null) {
throw new MalformedWebXmlException(
"init-param " + StringUtil.jQuote(name) + " without param-value. "
+ "Maybe the web.xml is not well-formed?");
}
try {
if (name.equals(DEPR_INITPARAM_OBJECT_WRAPPER)
|| name.equals(Configurable.OBJECT_WRAPPER_KEY)
|| name.equals(INIT_PARAM_TEMPLATE_PATH)
|| name.equals(Configuration.INCOMPATIBLE_IMPROVEMENTS)) {
// ignore: we have already processed these
} else if (name.equals(DEPR_INITPARAM_ENCODING)) { // BC
if (getInitParameter(Configuration.DEFAULT_ENCODING_KEY) != null) {
throw new ConflictingInitParamsException(
Configuration.DEFAULT_ENCODING_KEY, DEPR_INITPARAM_ENCODING);
}
config.setDefaultEncoding(value);
} else if (name.equals(DEPR_INITPARAM_TEMPLATE_DELAY)) { // BC
if (getInitParameter(Configuration.TEMPLATE_UPDATE_DELAY_KEY) != null) {
throw new ConflictingInitParamsException(
Configuration.TEMPLATE_UPDATE_DELAY_KEY, DEPR_INITPARAM_TEMPLATE_DELAY);
}
try {
config.setTemplateUpdateDelay(Integer.parseInt(value));
} catch (NumberFormatException e) {
// Intentionally ignored
}
} else if (name.equals(DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER)) { // BC
if (getInitParameter(Configurable.TEMPLATE_EXCEPTION_HANDLER_KEY) != null) {
throw new ConflictingInitParamsException(
Configurable.TEMPLATE_EXCEPTION_HANDLER_KEY, DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER);
}
if (DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER_RETHROW.equals(value)) {
config.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
} else if (DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER_DEBUG.equals(value)) {
config.setTemplateExceptionHandler(TemplateExceptionHandler.DEBUG_HANDLER);
} else if (DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER_HTML_DEBUG.equals(value)) {
config.setTemplateExceptionHandler(TemplateExceptionHandler.HTML_DEBUG_HANDLER);
} else if (DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER_IGNORE.equals(value)) {
config.setTemplateExceptionHandler(TemplateExceptionHandler.IGNORE_HANDLER);
} else {
throw new InitParamValueException(DEPR_INITPARAM_TEMPLATE_EXCEPTION_HANDLER, value,
"Not one of the supported values.");
}
} else if (name.equals(INIT_PARAM_NO_CACHE)) {
noCache = StringUtil.getYesNo(value);
} else if (name.equals(INIT_PARAM_BUFFER_SIZE)) {
bufferSize = Integer.valueOf(parseSize(value));
} else if (name.equals(DEPR_INITPARAM_DEBUG)) { // BC
if (getInitParameter(INIT_PARAM_DEBUG) != null) {
throw new ConflictingInitParamsException(INIT_PARAM_DEBUG, DEPR_INITPARAM_DEBUG);
}
debug = StringUtil.getYesNo(value);
} else if (name.equals(INIT_PARAM_DEBUG)) {
debug = StringUtil.getYesNo(value);
} else if (name.equals(INIT_PARAM_CONTENT_TYPE)) {
contentType = new ContentType(value);
} else if (name.equals(INIT_PARAM_OVERRIDE_RESPONSE_CONTENT_TYPE)) {
overrideResponseContentType = initParamValueToEnum(value, OverrideResponseContentType.values());
} else if (name.equals(INIT_PARAM_RESPONSE_CHARACTER_ENCODING)) {
responseCharacterEncoding = initParamValueToEnum(value, ResponseCharacterEncoding.values());
if (responseCharacterEncoding == ResponseCharacterEncoding.FORCE_CHARSET) {
String charsetName = value.substring(INIT_PARAM_VALUE_FORCE_PREFIX.length()).trim();
forcedResponseCharacterEncoding = Charset.forName(charsetName);
}
} else if (name.equals(INIT_PARAM_OVERRIDE_RESPONSE_LOCALE)) {
overrideResponseLocale = initParamValueToEnum(value, OverrideResponseLocale.values());
} else if (name.equals(INIT_PARAM_EXCEPTION_ON_MISSING_TEMPLATE)) {
exceptionOnMissingTemplate = StringUtil.getYesNo(value);
} else if (name.equals(INIT_PARAM_META_INF_TLD_LOCATIONS)) {;
metaInfTldSources = parseAsMetaInfTldLocations(value);
} else if (name.equals(INIT_PARAM_CLASSPATH_TLDS)) {;
List newClasspathTlds = new ArrayList();
if (classpathTlds != null) {
newClasspathTlds.addAll(classpathTlds);
}
newClasspathTlds.addAll(InitParamParser.parseCommaSeparatedList(value));
classpathTlds = newClasspathTlds;
} else {
config.setSetting(name, value);
}
} catch (ConflictingInitParamsException e) {
throw e;
} catch (Exception e) {
throw new InitParamValueException(name, value, e);
}
} // while initpnames
if (contentType.containsCharset && responseCharacterEncoding != ResponseCharacterEncoding.LEGACY) {
throw new InitParamValueException(INIT_PARAM_CONTENT_TYPE, contentType.httpHeaderValue,
new IllegalStateException("You can't specify the charset in the content type, because the \"" +
INIT_PARAM_RESPONSE_CHARACTER_ENCODING + "\" init-param isn't set to "
+ "\"" + INIT_PARAM_VALUE_LEGACY + "\"."));
}
}
private List/**/ parseAsMetaInfTldLocations(String value) throws ParseException {
List/**/ metaInfTldSources = null;
List/**/ values = InitParamParser.parseCommaSeparatedList(value);
for (Iterator it = values.iterator(); it.hasNext(); ) {
final String itemStr = (String) it.next();
final MetaInfTldSource metaInfTldSource;
if (itemStr.equals(META_INF_TLD_LOCATION_WEB_INF_PER_LIB_JARS)) {
metaInfTldSource = WebInfPerLibJarMetaInfTldSource.INSTANCE;
} else if (itemStr.startsWith(META_INF_TLD_LOCATION_CLASSPATH)) {
String itemRightSide = itemStr.substring(META_INF_TLD_LOCATION_CLASSPATH.length()).trim();
if (itemRightSide.length() == 0) {
metaInfTldSource = new ClasspathMetaInfTldSource(Pattern.compile(".*", Pattern.DOTALL));
} else if (itemRightSide.startsWith(":")) {
final String regexpStr = itemRightSide.substring(1).trim();
if (regexpStr.length() == 0) {
throw new ParseException("Empty regular expression after \""
+ META_INF_TLD_LOCATION_CLASSPATH + ":\"", -1);
}
metaInfTldSource = new ClasspathMetaInfTldSource(Pattern.compile(regexpStr));
} else {
throw new ParseException("Invalid \"" + META_INF_TLD_LOCATION_CLASSPATH
+ "\" value syntax: " + value, -1);
}
} else if (itemStr.startsWith(META_INF_TLD_LOCATION_CLEAR)) {
metaInfTldSource = ClearMetaInfTldSource.INSTANCE;
} else {
throw new ParseException("Item has no recognized source type prefix: " + itemStr, -1);
}
if (metaInfTldSources == null) {
metaInfTldSources = new ArrayList();
}
metaInfTldSources.add(metaInfTldSource);
}
return metaInfTldSources;
}
/**
* Create the template loader. The default implementation will create a {@link ClassTemplateLoader} if the template
* path starts with {@code "class://"}, a {@link FileTemplateLoader} if the template path starts with
* {@code "file://"}, and a {@link WebappTemplateLoader} otherwise. Also, if
* {@link Configuration#Configuration(freemarker.template.Version) incompatible_improvements} is 2.3.22 or higher,
* it will create a {@link MultiTemplateLoader} if the template path starts with {@code "["}.
*
* @param templatePath
* the template path to create a loader for
* @return a newly created template loader
*/
protected TemplateLoader createTemplateLoader(String templatePath) throws IOException {
return InitParamParser.createTemplateLoader(templatePath, getConfiguration(), getClass(), getServletContext());
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
process(request, response);
}
@Override
public void doPost(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
process(request, response);
}
private void process(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Give chance to subclasses to perform preprocessing
if (preprocessRequest(request, response)) {
return;
}
if (bufferSize != null && !response.isCommitted()) {
try {
response.setBufferSize(bufferSize.intValue());
} catch (IllegalStateException e) {
LOG.debug("Can't set buffer size any more,", e);
}
}
String templatePath = requestUrlToTemplatePath(request);
if (LOG.isDebugEnabled()) {
LOG.debug("Requested template " + StringUtil.jQuoteNoXSS(templatePath) + ".");
}
Locale locale = request.getLocale();
if (locale == null || overrideResponseLocale != OverrideResponseLocale.NEVER) {
locale = deduceLocale(templatePath, request, response);
}
final Template template;
try {
template = config.getTemplate(templatePath, locale);
} catch (TemplateNotFoundException e) {
if (exceptionOnMissingTemplate) {
throw newServletExceptionWithFreeMarkerLogging(
"Template not found for name " + StringUtil.jQuoteNoXSS(templatePath) + ".", e);
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("Responding HTTP 404 \"Not found\" for missing template "
+ StringUtil.jQuoteNoXSS(templatePath) + ".", e);
}
response.sendError(HttpServletResponse.SC_NOT_FOUND, "Page template not found");
return;
}
} catch (freemarker.core.ParseException e) {
throw newServletExceptionWithFreeMarkerLogging(
"Parsing error with template " + StringUtil.jQuoteNoXSS(templatePath) + ".", e);
} catch (Exception e) {
throw newServletExceptionWithFreeMarkerLogging(
"Unexpected error when loading template " + StringUtil.jQuoteNoXSS(templatePath) + ".", e);
}
boolean tempSpecContentTypeContainsCharset = false;
if (response.getContentType() == null || overrideResponseContentType != OverrideResponseContentType.NEVER) {
ContentType templateSpecificContentType = getTemplateSpecificContentType(template);
if (templateSpecificContentType != null) {
// With ResponseCharacterEncoding.LEGACY we should append the charset, but we don't do that for b. c.
response.setContentType(
responseCharacterEncoding != ResponseCharacterEncoding.DO_NOT_SET
? templateSpecificContentType.httpHeaderValue
: templateSpecificContentType.getMimeType());
tempSpecContentTypeContainsCharset = templateSpecificContentType.containsCharset;
} else if (response.getContentType() == null
|| overrideResponseContentType == OverrideResponseContentType.ALWAYS) {
if (responseCharacterEncoding == ResponseCharacterEncoding.LEGACY && !contentType.containsCharset) {
// In legacy mode we don't call response.setCharacterEncoding, so the charset must be set here:
response.setContentType(
contentType.httpHeaderValue + "; charset=" + getTemplateSpecificOutputEncoding(template));
} else {
response.setContentType(contentType.httpHeaderValue);
}
}
}
if (responseCharacterEncoding != ResponseCharacterEncoding.LEGACY
&& responseCharacterEncoding != ResponseCharacterEncoding.DO_NOT_SET) {
// Using the Servlet 2.4 way of setting character encoding.
if (responseCharacterEncoding != ResponseCharacterEncoding.FORCE_CHARSET) {
if (!tempSpecContentTypeContainsCharset) {
response.setCharacterEncoding(getTemplateSpecificOutputEncoding(template));
}
} else {
response.setCharacterEncoding(forcedResponseCharacterEncoding.name());
}
}
setBrowserCachingPolicy(response);
ServletContext servletContext = getServletContext();
try {
logWarnOnObjectWrapperMismatch();
TemplateModel model = createModel(wrapper, servletContext, request, response);
// Give subclasses a chance to hook into preprocessing
if (preTemplateProcess(request, response, template, model)) {
try {
// Process the template
Environment env = template.createProcessingEnvironment(model, response.getWriter());
if (responseCharacterEncoding != ResponseCharacterEncoding.LEGACY) {
String actualOutputCharset = response.getCharacterEncoding();
if (actualOutputCharset != null) {
env.setOutputEncoding(actualOutputCharset);
}
}
processEnvironment(env, request, response);
} finally {
// Give subclasses a chance to hook into postprocessing
postTemplateProcess(request, response, template, model);
}
}
} catch (TemplateException e) {
final TemplateExceptionHandler teh = config.getTemplateExceptionHandler();
// Ensure that debug handler responses aren't rolled back:
if (teh == TemplateExceptionHandler.HTML_DEBUG_HANDLER || teh == TemplateExceptionHandler.DEBUG_HANDLER
|| teh.getClass().getName().indexOf("Debug") != -1) {
response.flushBuffer();
}
throw newServletExceptionWithFreeMarkerLogging("Error executing FreeMarker template", e);
}
}
/**
* This is the method that actually executes the template. The original implementation coming from
* {@link FreemarkerServlet} simply calls {@link Environment#process()}. Overriding this method allows you to
* prepare the {@link Environment} before the execution, or extract information from the {@link Environment} after
* the execution. It also allows you to capture exceptions throw by the template.
*
* @param env
* The {@link Environment} object already set up to execute the template. You only have to call
* {@link Environment#process()} and the output will be produced by the template.
*
* @since 2.3.24
*/
protected void processEnvironment(Environment env, HttpServletRequest request, HttpServletResponse response)
throws TemplateException, IOException {
env.process();
}
private String getTemplateSpecificOutputEncoding(Template template) {
String outputEncoding = responseCharacterEncoding == ResponseCharacterEncoding.LEGACY ? null
: template.getOutputEncoding();
return outputEncoding != null ? outputEncoding : template.getEncoding();
}
private ContentType getTemplateSpecificContentType(final Template template) {
Object contentTypeAttr = template.getCustomAttribute("content_type");
if (contentTypeAttr != null) {
// Converted with toString() for backward compatibility.
return new ContentType(contentTypeAttr.toString());
}
String outputFormatMimeType = template.getOutputFormat().getMimeType();
if (outputFormatMimeType != null) {
if (responseCharacterEncoding == ResponseCharacterEncoding.LEGACY) {
// In legacy mode we won't call serlvetResponse.setCharacterEncoding(...), so:
return new ContentType(outputFormatMimeType + "; charset=" + getTemplateSpecificOutputEncoding(template), true);
} else {
return new ContentType(outputFormatMimeType, false);
}
}
return null;
}
private ServletException newServletExceptionWithFreeMarkerLogging(String message, Throwable cause) throws ServletException {
if (cause instanceof TemplateException) {
// For backward compatibility, we log into the same category as Environment did when
// log_template_exceptions was true.
LOG_RT.error(message, cause);
} else {
LOG.error(message, cause);
}
ServletException e = new ServletException(message, cause);
try {
// Prior to Servlet 2.5, the cause exception wasn't set by the above constructor.
// If we are on 2.5+ then this will throw an exception as the cause was already set.
e.initCause(cause);
} catch (Exception ex) {
// Ignored; see above
}
throw e;
}
@SuppressFBWarnings(value={ "MSF_MUTABLE_SERVLET_FIELD", "DC_DOUBLECHECK" }, justification="Performance trick")
private void logWarnOnObjectWrapperMismatch() {
// Deliberately uses double check locking.
if (wrapper != config.getObjectWrapper() && !objectWrapperMismatchWarnLogged && LOG.isWarnEnabled()) {
final boolean logWarn;
synchronized (this) {
logWarn = !objectWrapperMismatchWarnLogged;
if (logWarn) {
objectWrapperMismatchWarnLogged = true;
}
}
if (logWarn) {
LOG.warn(
this.getClass().getName()
+ ".wrapper != config.getObjectWrapper(); possibly the result of incorrect extension of "
+ FreemarkerServlet.class.getName() + ".");
}
}
}
/**
* Returns the locale used for the {@link Configuration#getTemplate(String, Locale)} call (as far as the
* {@value #INIT_PARAM_OVERRIDE_RESPONSE_LOCALE} Servlet init-param allows that). The base implementation in
* {@link FreemarkerServlet} simply returns the {@code locale} setting of the configuration. Override this method to
* provide different behavior, for example, to use the locale indicated in the HTTP request.
*
* @param templatePath
* The template path (template name) as it will be passed to {@link Configuration#getTemplate(String)}.
* (Not to be confused with the servlet init-param of identical name; they aren't related.)
*
* @throws ServletException
* Can be thrown since 2.3.22, if the locale can't be deduced from the URL.
*/
protected Locale deduceLocale(String templatePath, HttpServletRequest request, HttpServletResponse response)
throws ServletException {
return config.getLocale();
}
protected TemplateModel createModel(ObjectWrapper objectWrapper,
ServletContext servletContext,
final HttpServletRequest request,
final HttpServletResponse response) throws TemplateModelException {
try {
AllHttpScopesHashModel params = new AllHttpScopesHashModel(objectWrapper, servletContext, request);
// Create hash model wrapper for servlet context (the application)
final ServletContextHashModel servletContextModel;
final TaglibFactory taglibFactory;
synchronized (lazyInitFieldsLock) {
if (this.servletContextModel == null) {
servletContextModel = new ServletContextHashModel(this, objectWrapper);
taglibFactory = createTaglibFactory(objectWrapper, servletContext);
// For backward compatibility only. We don't use these:
servletContext.setAttribute(ATTR_APPLICATION_MODEL, servletContextModel);
servletContext.setAttribute(ATTR_JSP_TAGLIBS_MODEL, taglibFactory);
initializeServletContext(request, response);
this.taglibFactory = taglibFactory;
this.servletContextModel = servletContextModel;
} else {
servletContextModel = this.servletContextModel;
taglibFactory = this.taglibFactory;
}
}
params.putUnlistedModel(KEY_APPLICATION, servletContextModel);
params.putUnlistedModel(KEY_APPLICATION_PRIVATE, servletContextModel);
params.putUnlistedModel(KEY_JSP_TAGLIBS, taglibFactory);
// Create hash model wrapper for session
HttpSessionHashModel sessionModel;
HttpSession session = request.getSession(false);
if (session != null) {
sessionModel = (HttpSessionHashModel) session.getAttribute(ATTR_SESSION_MODEL);
if (sessionModel == null || sessionModel.isOrphaned(session)) {
sessionModel = new HttpSessionHashModel(session, objectWrapper);
initializeSessionAndInstallModel(request, response,
sessionModel, session);
}
} else {
sessionModel = new HttpSessionHashModel(this, request, response, objectWrapper);
}
params.putUnlistedModel(KEY_SESSION, sessionModel);
// Create hash model wrapper for request
HttpRequestHashModel requestModel =
(HttpRequestHashModel) request.getAttribute(ATTR_REQUEST_MODEL);
if (requestModel == null || requestModel.getRequest() != request) {
requestModel = new HttpRequestHashModel(request, response, objectWrapper);
request.setAttribute(ATTR_REQUEST_MODEL, requestModel);
request.setAttribute(
ATTR_REQUEST_PARAMETERS_MODEL,
createRequestParametersHashModel(request));
}
params.putUnlistedModel(KEY_REQUEST, requestModel);
params.putUnlistedModel(KEY_INCLUDE, new IncludePage(request, response));
params.putUnlistedModel(KEY_REQUEST_PRIVATE, requestModel);
// Create hash model wrapper for request parameters
HttpRequestParametersHashModel requestParametersModel =
(HttpRequestParametersHashModel) request.getAttribute(
ATTR_REQUEST_PARAMETERS_MODEL);
params.putUnlistedModel(KEY_REQUEST_PARAMETERS, requestParametersModel);
return params;
} catch (ServletException | IOException e) {
throw new TemplateModelException(e);
}
}
/**
* Called to create the {@link TaglibFactory} once per servlet context.
* The default implementation configures it based on the servlet-init parameters and various other environmental
* settings, so if you override this method, you should call super, then adjust the result.
*
* @since 2.3.22
*/
protected TaglibFactory createTaglibFactory(ObjectWrapper objectWrapper,
ServletContext servletContext) throws TemplateModelException {
TaglibFactory taglibFactory = new TaglibFactory(servletContext);
taglibFactory.setObjectWrapper(objectWrapper);
{
List/**/ mergedMetaInfTldSources = new ArrayList();
if (metaInfTldSources != null) {
mergedMetaInfTldSources.addAll(metaInfTldSources);
}
String sysPropVal = SecurityUtilities.getSystemProperty(SYSTEM_PROPERTY_META_INF_TLD_SOURCES, null);
if (sysPropVal != null) {
try {
List metaInfTldSourcesSysProp = parseAsMetaInfTldLocations(sysPropVal);
if (metaInfTldSourcesSysProp != null) {
mergedMetaInfTldSources.addAll(metaInfTldSourcesSysProp);
}
} catch (ParseException e) {
throw new TemplateModelException("Failed to parse system property \""
+ SYSTEM_PROPERTY_META_INF_TLD_SOURCES + "\"", e);
}
}
List/**/ jettyTaglibJarPatterns = null;
try {
final String attrVal = (String) servletContext.getAttribute(ATTR_JETTY_CP_TAGLIB_JAR_PATTERNS);
jettyTaglibJarPatterns = attrVal != null ? InitParamParser.parseCommaSeparatedPatterns(attrVal) : null;
} catch (Exception e) {
LOG.error("Failed to parse application context attribute \""
+ ATTR_JETTY_CP_TAGLIB_JAR_PATTERNS + "\" - it will be ignored", e);
}
if (jettyTaglibJarPatterns != null) {
for (Iterator/**/ it = jettyTaglibJarPatterns.iterator(); it.hasNext(); ) {
Pattern pattern = (Pattern) it.next();
mergedMetaInfTldSources.add(new ClasspathMetaInfTldSource(pattern));
}
}
taglibFactory.setMetaInfTldSources(mergedMetaInfTldSources);
}
{
List/**/ mergedClassPathTlds = new ArrayList();
if (classpathTlds != null) {
mergedClassPathTlds.addAll(classpathTlds);
}
String sysPropVal = SecurityUtilities.getSystemProperty(SYSTEM_PROPERTY_CLASSPATH_TLDS, null);
if (sysPropVal != null) {
try {
List/**/ classpathTldsSysProp = InitParamParser.parseCommaSeparatedList(sysPropVal);
if (classpathTldsSysProp != null) {
mergedClassPathTlds.addAll(classpathTldsSysProp);
}
} catch (ParseException e) {
throw new TemplateModelException("Failed to parse system property \""
+ SYSTEM_PROPERTY_CLASSPATH_TLDS + "\"", e);
}
}
taglibFactory.setClasspathTlds(mergedClassPathTlds);
}
return taglibFactory;
}
/**
* Creates the default of the {@value #INIT_PARAM_CLASSPATH_TLDS} init-param; if this init-param is specified, it
* will be appended after the default, not replace it.
*
*
* The implementation in {@link FreemarkerServlet} returns {@link TaglibFactory#DEFAULT_CLASSPATH_TLDS}.
*
* @return A {@link List} of {@link String}-s; not {@code null}.
*
* @since 2.3.22
*/
protected List/**/ createDefaultClassPathTlds() {
return TaglibFactory.DEFAULT_CLASSPATH_TLDS;
}
/**
* Creates the default of the {@value #INIT_PARAM_META_INF_TLD_LOCATIONS} init-param; if this init-param is
* specified, it will completelly replace the default value.
*
*
* The implementation in {@link FreemarkerServlet} returns {@link TaglibFactory#DEFAULT_META_INF_TLD_SOURCES}.
*
* @return A {@link List} of {@link MetaInfTldSource}-s; not {@code null}.
*
* @since 2.3.22
*/
protected List/**/ createDefaultMetaInfTldSources() {
return TaglibFactory.DEFAULT_META_INF_TLD_SOURCES;
}
void initializeSessionAndInstallModel(HttpServletRequest request,
HttpServletResponse response, HttpSessionHashModel sessionModel,
HttpSession session)
throws ServletException, IOException {
session.setAttribute(ATTR_SESSION_MODEL, sessionModel);
initializeSession(request, response);
}
/**
* Maps the request URL to a template path (template name) that is passed to
* {@link Configuration#getTemplate(String, Locale)}. You can override it (i.e. to provide advanced rewriting
* capabilities), but you are strongly encouraged to call the overridden method first, then only modify its return
* value.
*
* @param request
* The currently processed HTTP request
* @return The template path (template name); can't be {@code null}. This is what's passed to
* {@link Configuration#getTemplate(String)} later. (Not to be confused with the {@code templatePath}
* servlet init-param of identical name; that basically specifies the "virtual file system" to which this
* will be relative to.)
*
* @throws ServletException
* Can be thrown since 2.3.22, if the template path can't be deduced from the URL.
*/
protected String requestUrlToTemplatePath(HttpServletRequest request) throws ServletException {
// First, see if it's an included request
String includeServletPath = (String) request.getAttribute("javax.servlet.include.servlet_path");
if (includeServletPath != null) {
// Try path info; only if that's null (servlet is mapped to an
// URL extension instead of to prefix) use servlet path.
String includePathInfo = (String) request.getAttribute("javax.servlet.include.path_info");
return includePathInfo == null ? includeServletPath : includePathInfo;
}
// Seems that the servlet was not called as the result of a
// RequestDispatcher.include(...). Try pathInfo then servletPath again,
// only now directly on the request object:
String path = request.getPathInfo();
if (path != null) return path;
path = request.getServletPath();
if (path != null) return path;
// Seems that it's a servlet mapped with prefix, and there was no extra path info.
return "";
}
/**
* Called as the first step in request processing, before the templating mechanism
* is put to work. By default does nothing and returns false. This method is
* typically overridden to manage serving of non-template resources (i.e. images)
* that reside in the template directory.
* @param request the HTTP request
* @param response the HTTP response
* @return true to indicate this method has processed the request entirely,
* and that the further request processing should not take place.
*/
protected boolean preprocessRequest(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
return false;
}
/**
* Creates the FreeMarker {@link Configuration} singleton and (when overidden) maybe sets its defaults. Servlet
* init-params will be applied later, and thus can overwrite the settings specified here.
*
*
* By overriding this method you can set your preferred {@link Configuration} setting defaults, as only the settings
* for which an init-param was specified will be overwritten later. (Note that {@link FreemarkerServlet} also has
* its own defaults for a few settings, but since 2.3.22, the servlet detects if those settings were already set
* here and then it won't overwrite them.)
*
*
* The default implementation simply creates a new instance with {@link Configuration#Configuration()} and returns
* it.
*/
protected Configuration createConfiguration() {
// We can only set incompatible_improvements later, so ignore the deprecation warning here.
return new Configuration();
}
/**
* Sets the defaults of the configuration that are specific to the {@link FreemarkerServlet} subclass.
* This is called after the common (wired in) {@link FreemarkerServlet} setting defaults was set, also the
*/
protected void setConfigurationDefaults() {
// do nothing
}
/**
* Called from {@link #init()} to create the {@link ObjectWrapper}; to customzie this aspect, in most cases you
* should override {@link #createDefaultObjectWrapper()} instead. Overriding this method is necessary when you want
* to customize how the {@link ObjectWrapper} is created from the init-param values, or you want to do some
* post-processing (like checking) on the created {@link ObjectWrapper}. To customize init-param interpretation,
* call {@link #getInitParameter(String)} with {@link Configurable#OBJECT_WRAPPER_KEY} as argument, and see if it
* returns a value that you want to interpret yourself. If was {@code null} or you don't want to interpret the
* value, fall back to the super method.
*
*
* The default implementation interprets the {@code object_wrapper} servlet init-param with
* calling {@link Configurable#setSetting(String, String)} (see valid values there), or if there's no such servlet
* init-param, then it calls {@link #createDefaultObjectWrapper()}.
*
* @return The {@link ObjectWrapper} that will be used for adapting request, session, and servlet context attributes
* to {@link TemplateModel}-s, and also as the object wrapper setting of {@link Configuration}.
*/
protected ObjectWrapper createObjectWrapper() {
String wrapper = getServletConfig().getInitParameter(DEPR_INITPARAM_OBJECT_WRAPPER);
if (wrapper != null) { // BC
if (getInitParameter(Configurable.OBJECT_WRAPPER_KEY) != null) {
throw new RuntimeException("Conflicting init-params: "
+ Configurable.OBJECT_WRAPPER_KEY + " and "
+ DEPR_INITPARAM_OBJECT_WRAPPER);
}
if (DEPR_INITPARAM_WRAPPER_BEANS.equals(wrapper)) {
return ObjectWrapper.BEANS_WRAPPER;
}
if (DEPR_INITPARAM_WRAPPER_SIMPLE.equals(wrapper)) {
return ObjectWrapper.SIMPLE_WRAPPER;
}
if (DEPR_INITPARAM_WRAPPER_JYTHON.equals(wrapper)) {
// Avoiding compile-time dependency on Jython package
try {
return (ObjectWrapper) Class.forName("freemarker.ext.jython.JythonWrapper")
.newInstance();
} catch (InstantiationException e) {
throw new InstantiationError(e.getMessage());
} catch (IllegalAccessException e) {
throw new IllegalAccessError(e.getMessage());
} catch (ClassNotFoundException e) {
throw new NoClassDefFoundError(e.getMessage());
}
}
return createDefaultObjectWrapper();
} else {
wrapper = getInitParameter(Configurable.OBJECT_WRAPPER_KEY);
if (wrapper == null) {
if (!config.isObjectWrapperExplicitlySet()) {
return createDefaultObjectWrapper();
} else {
return config.getObjectWrapper();
}
} else {
try {
config.setSetting(Configurable.OBJECT_WRAPPER_KEY, wrapper);
} catch (TemplateException e) {
throw new RuntimeException("Failed to set " + Configurable.OBJECT_WRAPPER_KEY, e);
}
return config.getObjectWrapper();
}
}
}
/**
* Override this to specify what the default {@link ObjectWrapper} will be when the
* {@code object_wrapper} Servlet init-param wasn't specified. Note that this is called by
* {@link #createConfiguration()}, and so if that was also overidden but improperly then this method might won't be
* ever called. Also note that if you set the {@code object_wrapper} in {@link #createConfiguration()}, then this
* won't be called, since then that has already specified the default.
*
*
* The default implementation calls {@link Configuration#getDefaultObjectWrapper(freemarker.template.Version)}. You
* should also pass in the version paramter when creating an {@link ObjectWrapper} that supports that. You can get
* the version by calling {@link #getConfiguration()} and then {@link Configuration#getIncompatibleImprovements()}.
*
* @since 2.3.22
*/
protected ObjectWrapper createDefaultObjectWrapper() {
return Configuration.getDefaultObjectWrapper(config.getIncompatibleImprovements());
}
/**
* Should be final; don't override it. Override {@link #createObjectWrapper()} instead.
*/
// [2.4] Make it final
protected ObjectWrapper getObjectWrapper() {
return wrapper;
}
/**
* The value of the {@code TemplatePath} init-param. {@code null} if the {@code template_loader} setting was set in
* a custom {@link #createConfiguration()}.
*
* @deprecated Not called by FreeMarker code, and there's no point to override this (unless to cause confusion).
*/
@Deprecated
protected final String getTemplatePath() {
return templatePath;
}
protected HttpRequestParametersHashModel createRequestParametersHashModel(HttpServletRequest request) {
return new HttpRequestParametersHashModel(request);
}
/**
* Called when servlet detects in a request processing that
* application-global (that is, ServletContext-specific) attributes are not yet
* set.
* This is a generic hook you might use in subclasses to perform a specific
* action on first request in the context. By default it does nothing.
* @param request the actual HTTP request
* @param response the actual HTTP response
*/
protected void initializeServletContext(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
}
/**
* Called when servlet detects in a request processing that session-global
* (that is, HttpSession-specific) attributes are not yet set.
* This is a generic hook you might use in subclasses to perform a specific
* action on first request in the session. By default it does nothing. It
* is only invoked on newly created sessions; it's not invoked when a
* replicated session is reinstantiated in another servlet container.
*
* @param request the actual HTTP request
* @param response the actual HTTP response
*/
protected void initializeSession(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
}
/**
* Called before the execution is passed to {@link Template#process(Object, java.io.Writer)}. This is a
* generic hook you might use in subclasses to perform a specific action before the template is processed.
*
* @param request
* The HTTP request that we will response to.
* @param response
* The HTTP response. The HTTP headers are already initialized here, such as the {@code conteType} and
* the {@code responseCharacterEncoding} are already set, but you can do the final adjustments here. The
* response {@link Writer} isn't created yet, so changing HTTP headers and buffering parameters works.
* @param template
* The template that will get executed
* @param model
* The data model that will be passed to the template. By default this will be an
* {@link AllHttpScopesHashModel} (which is a {@link freemarker.template.SimpleHash} subclass). Thus, you
* can add new variables to the data-model with the
* {@link freemarker.template.SimpleHash#put(String, Object)} subclass) method. However, to adjust the
* data-model, overriding
* {@link #createModel(ObjectWrapper, ServletContext, HttpServletRequest, HttpServletResponse)} is
* probably a more appropriate place.
*
* @return true to process the template, false to suppress template processing.
*/
protected boolean preTemplateProcess(
HttpServletRequest request,
HttpServletResponse response,
Template template,
TemplateModel model)
throws ServletException, IOException {
return true;
}
/**
* Called after the execution returns from {@link Template#process(Object, java.io.Writer)}.
* This is a generic hook you might use in subclasses to perform a specific
* action after the template is processed. It will be invoked even if the
* template processing throws an exception. By default does nothing.
* @param request the actual HTTP request
* @param response the actual HTTP response
* @param template the template that was executed
* @param data the data that was passed to the template
*/
protected void postTemplateProcess(
HttpServletRequest request,
HttpServletResponse response,
Template template,
TemplateModel data)
throws ServletException, IOException {
}
/**
* Returns the {@link freemarker.template.Configuration} object used by this servlet.
* Please don't forget that {@link freemarker.template.Configuration} is not thread-safe
* when you modify it.
*/
protected Configuration getConfiguration() {
return config;
}
/**
* Returns the default value of the {@value #INIT_PARAM_OVERRIDE_RESPONSE_CONTENT_TYPE} Servlet init-param.
* The method inherited from {@link FreemarkerServlet} returns {@value #INIT_PARAM_VALUE_ALWAYS}; subclasses my
* override this.
*
* @since 2.3.24
*/
protected String getDefaultOverrideResponseContentType() {
return INIT_PARAM_VALUE_ALWAYS;
}
/**
* If the parameter "nocache" was set to true, generate a set of headers
* that will advise the HTTP client not to cache the returned page.
*/
private void setBrowserCachingPolicy(HttpServletResponse res) {
if (noCache) {
// HTTP/1.1 + IE extensions
res.setHeader("Cache-Control", "no-store, no-cache, must-revalidate, "
+ "post-check=0, pre-check=0");
// HTTP/1.0
res.setHeader("Pragma", "no-cache");
// Last resort for those that ignore all of the above
res.setHeader("Expires", EXPIRATION_DATE);
}
}
private int parseSize(String value) throws ParseException {
int lastDigitIdx;
for (lastDigitIdx = value.length() - 1; lastDigitIdx >= 0; lastDigitIdx--) {
char c = value.charAt(lastDigitIdx);
if (c >= '0' && c <= '9') {
break;
}
}
final int n = Integer.parseInt(value.substring(0, lastDigitIdx + 1).trim());
final String unitStr = value.substring(lastDigitIdx + 1).trim().toUpperCase();
final int unit;
if (unitStr.length() == 0 || unitStr.equals("B")) {
unit = 1;
} else if (unitStr.equals("K") || unitStr.equals("KB") || unitStr.equals("KIB")) {
unit = 1024;
} else if (unitStr.equals("M") || unitStr.equals("MB") || unitStr.equals("MIB")) {
unit = 1024 * 1024;
} else {
throw new ParseException("Unknown unit: " + unitStr, lastDigitIdx + 1);
}
long size = (long) n * unit;
if (size < 0) {
throw new IllegalArgumentException("Buffer size can't be negative");
}
if (size > Integer.MAX_VALUE) {
throw new IllegalArgumentException("Buffer size can't bigger than " + Integer.MAX_VALUE);
}
return (int) size;
}
private static class InitParamValueException extends Exception {
InitParamValueException(String initParamName, String initParamValue, Throwable casue) {
super("Failed to set the " + StringUtil.jQuote(initParamName) + " servlet init-param to "
+ StringUtil.jQuote(initParamValue) + "; see cause exception.",
casue);
}
public InitParamValueException(String initParamName, String initParamValue, String cause) {
super("Failed to set the " + StringUtil.jQuote(initParamName) + " servlet init-param to "
+ StringUtil.jQuote(initParamValue) + ": " + cause);
}
}
private static class ConflictingInitParamsException extends Exception {
ConflictingInitParamsException(String recommendedName, String otherName) {
super("Conflicting servlet init-params: "
+ StringUtil.jQuote(recommendedName) + " and " + StringUtil.jQuote(otherName)
+ ". Only use " + StringUtil.jQuote(recommendedName) + ".");
}
}
private static class MalformedWebXmlException extends Exception {
MalformedWebXmlException(String message) {
super(message);
}
}
private static class ContentType {
private final String httpHeaderValue;
private final boolean containsCharset;
public ContentType(String httpHeaderValue) {
this(httpHeaderValue, contentTypeContainsCharset(httpHeaderValue));
}
public ContentType(String httpHeaderValue, boolean containsCharset) {
this.httpHeaderValue = httpHeaderValue;
this.containsCharset = containsCharset;
}
private static boolean contentTypeContainsCharset(String contentType) {
int charsetIdx = contentType.toLowerCase().indexOf("charset=");
if (charsetIdx != -1) {
char c = 0;
charsetIdx--;
while (charsetIdx >= 0) {
c = contentType.charAt(charsetIdx);
if (!Character.isWhitespace(c)) break;
charsetIdx--;
}
if (charsetIdx == -1 || c == ';') {
return true;
}
}
return false;
}
/**
* Extracts the MIME type without the charset specifier or other such extras.
*/
private String getMimeType() {
int scIdx = httpHeaderValue.indexOf(';');
return (scIdx == -1 ? httpHeaderValue : httpHeaderValue.substring(0, scIdx)).trim();
}
}
private T initParamValueToEnum(String initParamValue, T[] enumValues) {
for (T enumValue : enumValues) {
String enumInitParamValue = enumValue.getInitParamValue();
if (initParamValue.equals(enumInitParamValue)
|| enumInitParamValue.endsWith("}") && initParamValue.startsWith(
enumInitParamValue.substring(0, enumInitParamValue.indexOf("${")))) {
return enumValue;
}
}
StringBuilder sb = new StringBuilder();
sb.append(StringUtil.jQuote(initParamValue));
sb.append(" is not a one of the enumeration values: ");
boolean first = true;
for (T value : enumValues) {
if (!first) {
sb.append(", ");
} else {
first = false;
}
sb.append(StringUtil.jQuote(value.getInitParamValue()));
}
throw new IllegalArgumentException(sb.toString());
}
/**
* Superclass of all (future) init-param value enums.
*
* @see #initParamValueToEnum
*/
private interface InitParamValueEnum {
String getInitParamValue();
}
private enum OverrideResponseContentType implements InitParamValueEnum {
ALWAYS(INIT_PARAM_VALUE_ALWAYS),
NEVER(INIT_PARAM_VALUE_NEVER),
WHEN_TEMPLATE_HAS_MIME_TYPE(INIT_PARAM_VALUE_WHEN_TEMPLATE_HAS_MIME_TYPE);
private final String initParamValue;
OverrideResponseContentType(String initParamValue) {
this.initParamValue = initParamValue;
}
@Override
public String getInitParamValue() {
return initParamValue;
}
}
private enum ResponseCharacterEncoding implements InitParamValueEnum {
LEGACY(INIT_PARAM_VALUE_LEGACY),
FROM_TEMPLATE(INIT_PARAM_VALUE_FROM_TEMPLATE),
DO_NOT_SET(INIT_PARAM_VALUE_DO_NOT_SET),
FORCE_CHARSET(INIT_PARAM_VALUE_FORCE_PREFIX + "${charsetName}");
private final String initParamValue;
ResponseCharacterEncoding(String initParamValue) {
this.initParamValue = initParamValue;
}
@Override
public String getInitParamValue() {
return initParamValue;
}
}
private enum OverrideResponseLocale implements InitParamValueEnum {
ALWAYS(INIT_PARAM_VALUE_ALWAYS),
NEVER(INIT_PARAM_VALUE_NEVER);
private final String initParamValue;
OverrideResponseLocale(String initParamValue) {
this.initParamValue = initParamValue;
}
@Override
public String getInitParamValue() {
return initParamValue;
}
}
}