cmsjsploader.java

OpenCms 是一个J2EE的产品

        boolean streaming,
        boolean top) {

        CmsFlexController controller = null;
        if (top) {
            // only check for existing contoller if this is the "top" request/response
            controller = CmsFlexController.getController(req);
        }
        if (controller == null) {
            // create new request / response wrappers
            controller = new CmsFlexController(cms, resource, m_cache, req, res, streaming, top);
            CmsFlexController.setController(req, controller);
            CmsFlexRequest f_req = new CmsFlexRequest(req, controller);
            CmsFlexResponse f_res = new CmsFlexResponse(res, controller, streaming, true);
            controller.push(f_req, f_res);
        } else if (controller.isForwardMode()) {
            // reset CmsObject (because of URI) if in forward mode
            controller = new CmsFlexController(cms, controller);
            CmsFlexController.setController(req, controller);
        }
        return controller;
    }

    /**
     * Parses the JSP and modifies OpenCms critical directive information.<p>
     * 
     * @param byteContent the original JSP content
     * @param encoding the encoding to use for the JSP
     * @param controller the controller for the JSP integration
     * @param includes a Set containing all JSP pages that have been already updated
     * @param isHardInclude indicated if this page is actually a "hard" include with <code>&lt;%@ include file="..." &gt;</code>
     * @return the modified JSP content
     * @throws UnsupportedEncodingException
     */
    private byte[] parseJsp(
        byte[] byteContent,
        String encoding,
        CmsFlexController controller,
        Set includes,
        boolean isHardInclude) {

        String content;
        // make sure encoding is set correctly
        try {
            content = new String(byteContent, encoding);
        } catch (UnsupportedEncodingException e) {
            // encoding property is not set correctly 
            LOG.error(Messages.get().getBundle().key(
                Messages.LOG_UNSUPPORTED_ENC_1,
                controller.getCurrentRequest().getElementUri()), e);
            try {
                encoding = OpenCms.getSystemInfo().getDefaultEncoding();
                content = new String(byteContent, encoding);
            } catch (UnsupportedEncodingException e2) {
                // should not happen since default encoding is always a valid encoding (checked during system startup)
                content = new String(byteContent);
            }
        }

        // parse for special <%@cms file="..." %> tag
        content = parseJspCmsTag(content, controller, includes);
        // parse for included files in tags
        content = parseJspIncludes(content, controller, includes);
        // parse for <%@page pageEncoding="..." %> tag
        content = parseJspEncoding(content, encoding, isHardInclude);
        // convert the result to bytes and return it
        try {
            return content.getBytes(encoding);
        } catch (UnsupportedEncodingException e) {
            // should not happen since encoding was already checked
            return content.getBytes();
        }
    }

    /**
     * Parses the JSP content for the special <code>&lt;%cms file="..." %&gt;</code> tag.<p>
     * 
     * @param content the JSP content to parse
     * @param controller the current JSP controller
     * @param includes a set of already parsed includes
     * @return the parsed JSP content
     */
    private String parseJspCmsTag(String content, CmsFlexController controller, Set includes) {

        // check if a JSP directive occurs in the file
        int i1 = content.indexOf(DIRECTIVE_START);
        if (i1 < 0) {
            // no directive occurs
            return content;
        }

        StringBuffer buf = new StringBuffer(content.length());
        int p0 = 0, i2 = 0, slen = DIRECTIVE_START.length(), elen = DIRECTIVE_END.length();

        while (i1 >= 0) {
            // parse the file and replace JSP filename references 
            i2 = content.indexOf(DIRECTIVE_END, i1 + slen);
            if (i2 < 0) {
                // wrong syntax (missing end directive) - let the JSP compiler produce the error message
                return content;
            } else if (i2 > i1) {
                String directive = content.substring(i1 + slen, i2);
                if (LOG.isDebugEnabled()) {
                    LOG.debug(Messages.get().getBundle().key(
                        Messages.LOG_DIRECTIVE_DETECTED_3,
                        DIRECTIVE_START,
                        directive,
                        DIRECTIVE_END));
                }

                int t1 = 0, t2 = 0, t3 = 0, t4 = 0, t5 = 0;
                while (directive.charAt(t1) == ' ') {
                    t1++;
                }
                String argument = null;
                if (directive.startsWith("cms", t1)) {
                    if (LOG.isDebugEnabled()) {
                        LOG.debug(Messages.get().getBundle().key(Messages.LOG_X_DIRECTIVE_DETECTED_1, "cms"));
                    }
                    t2 = directive.indexOf("file", t1 + 3);
                    t5 = 4;
                }

                if (t2 > 0) {
                    String sub = directive.substring(t2 + t5);
                    char c1 = sub.charAt(t3);
                    while ((c1 == ' ') || (c1 == '=') || (c1 == '"')) {
                        c1 = sub.charAt(++t3);
                    }
                    t4 = t3;
                    while (c1 != '"') {
                        c1 = sub.charAt(++t4);
                    }
                    if (t4 > t3) {
                        argument = sub.substring(t3, t4);
                    }
                    if (LOG.isDebugEnabled()) {
                        LOG.debug(Messages.get().getBundle().key(Messages.LOG_DIRECTIVE_ARG_1, argument));
                    }
                }

                if (argument != null) {
                    //  try to update the referenced file
                    String jspname = updateJsp(argument, controller, includes);
                    if (jspname != null) {
                        directive = jspname;
                        if (LOG.isDebugEnabled()) {
                            LOG.debug(Messages.get().getBundle().key(
                                Messages.LOG_DIRECTIVE_CHANGED_3,
                                DIRECTIVE_START,
                                directive,
                                DIRECTIVE_END));
                        }
                    }
                    // cms directive was found
                    buf.append(content.substring(p0, i1));
                    buf.append(directive);
                    p0 = i2 + elen;
                    i1 = content.indexOf(DIRECTIVE_START, p0);
                } else {
                    // cms directive was not found
                    buf.append(content.substring(p0, i1 + slen));
                    buf.append(directive);
                    p0 = i2;
                    i1 = content.indexOf(DIRECTIVE_START, p0);
                }
            }
        }
        if (i2 > 0) {
            // the content of the JSP was changed 
            buf.append(content.substring(p0, content.length()));
            content = buf.toString();
        }
        return content;
    }

    /**
     * Parses the JSP content for the  <code>&lt;%page pageEncoding="..." %&gt;</code> tag
     * and ensures that the JSP page encoding is set according to the OpenCms 
     * "content-encoding" property value of the JSP.<p>
     * 
     * @param content the JSP content to parse
     * @param encoding the encoding to use for the JSP
     * @param isHardInclude indicated if this page is actually a "hard" include with <code>&lt;%@ include file="..." &gt;</code>
     * @return the parsed JSP content
     */
    private String parseJspEncoding(String content, String encoding, boolean isHardInclude) {

        // check if a JSP directive occurs in the file
        int i1 = content.indexOf(DIRECTIVE_START);
        if (i1 < 0) {
            // no directive occurs
            if (isHardInclude) {
                return content;
            }
        }

        StringBuffer buf = new StringBuffer(content.length() + 64);
        int p0 = 0, i2 = 0, slen = DIRECTIVE_START.length();
        boolean found = false;

        if (i1 < 0) {
            // no directive found at all, append content to buffer
            buf.append(content);
        }

        while (i1 >= 0) {
            // parse the file and set/replace page encoding
            i2 = content.indexOf(DIRECTIVE_END, i1 + slen);
            if (i2 < 0) {
                // wrong syntax (missing end directive) - let the JSP compiler produce the error message
                return content;
            } else if (i2 > i1) {
                String directive = content.substring(i1 + slen, i2);
                if (LOG.isDebugEnabled()) {
                    LOG.debug(Messages.get().getBundle().key(
                        Messages.LOG_DIRECTIVE_DETECTED_3,
                        DIRECTIVE_START,
                        directive,
                        DIRECTIVE_END));
                }

                int t1 = 0, t2 = 0, t3 = 0, t4 = 0, t5 = 0;
                while (directive.charAt(t1) == ' ') {
                    t1++;
                }
                String argument = null;
                if (directive.startsWith("page", t1)) {
                    if (LOG.isDebugEnabled()) {
                        LOG.debug(Messages.get().getBundle().key(Messages.LOG_X_DIRECTIVE_DETECTED_1, "page"));
                    }
                    t2 = directive.indexOf("pageEncoding", t1 + 4);
                    t5 = 12;
                    if (t2 > 0) {
                        found = true;
                    }
                }

                if (t2 > 0) {
                    String sub = directive.substring(t2 + t5);
                    char c1 = sub.charAt(t3);
                    while ((c1 == ' ') || (c1 == '=') || (c1 == '"')) {
                        c1 = sub.charAt(++t3);
                    }
                    t4 = t3;
                    while (c1 != '"') {
                        c1 = sub.charAt(++t4);
                    }
                    if (t4 > t3) {
                        argument = sub.substring(t3, t4);
                    }
                    if (LOG.isDebugEnabled()) {
                        LOG.debug(Messages.get().getBundle().key(Messages.LOG_DIRECTIVE_ARG_1, argument));
                    }
                }

                if (argument != null) {
                    // a pageEncoding setting was found, changes have to be made
                    String pre = directive.substring(0, t2 + t3 + t5);
                    String suf = directive.substring(t2 + t3 + t5 + argument.length());
                    // change the encoding
                    directive = pre + encoding + suf;
                    if (LOG.isDebugEnabled()) {
                        LOG.debug(Messages.get().getBundle().key(
                            Messages.LOG_DIRECTIVE_CHANGED_3,
                            DIRECTIVE_START,
                            directive,
                            DIRECTIVE_END));
                    }
                }

                buf.append(content.substring(p0, i1 + slen));
                buf.append(directive);
                p0 = i2;
                i1 = content.indexOf(DIRECTIVE_START, p0);
            }
        }
        if (i2 > 0) {
            // the content of the JSP was changed 
            buf.append(content.substring(p0, content.length()));
        }
        if (found) {
            content = buf.toString();
        } else if (!isHardInclude) {
            // encoding setting was not found
            // if this is not a "hard" include then add the encoding to the top of the page
            // checking for the hard include is important to prevent errors with