So far, you’ve been working with Zope objects in your web browser via the Zope Management Interface. This chapter details how to use common non-browser-based common to access and modify your Zope content.
Editing Zope content and code in the Zope Management Interface is sometimes painful, especially when dealing with Python code, DTML, ZPT, or even just HTML. The standard TEXTAREA text manipulation widget provided by most browsers has an extremely limited feature set: no syntax highlighting, no auto-indent, no key re-bindings, no WYSIWYG HTML editing, and sometimes not even a search and replace function!
In short, people want to use their own tools, or at least more feature-rich tools, to work with Zope content.
It is possible under most operating systems to use the text “cut and paste” facility (Ctrl-C, Ctrl-V under Windows, for example) to move text between traditional text/HTML editors and your browser, copying data back and forth between the Zope Management interface and your other tools. This is, at best, cumbersome.
Luckily, Zope provides features that may allow you to interface Zope directly with your existing tools. This chapter describes these features, as well as the caveats for working with them.
Most external tools expect to deal with “file-like” content. Zope objects are not really files in the strict sense of the word so there are caveats to using external tools with Zope:
These caveats aside, you may use traditional file manipulation tools to manage most kinds of Zope objects.
Most Zope “file-like” objects like DTML Methods, DTML Documents, Zope Page Templates, Script (Python) objects and others can be edited with FTP and WebDAV. Many HTML and text editors support these protocols for editing documents on remote servers. Each of these protocols has advantages and disadvantages:
FTP is the File Transfer Protocol. FTP is used to transfer files from one computer to another. Many text editors and HTML editors support FTP.
Some examples of editors and applications that support FTP are Homesite, KDE suite of applications (Kate, Quanta, Kwrite, Konqueror), Bluefish, and Dreamweaver.
WebDAV is a new Internet protocol based on the Web’s underlying protocol, HTTP. DAV stands for Distributed Authoring and Versioning. Because DAV is new, it may not be supported by as many text and HTML editors as FTP.
There are many popular FTP clients, and many web browsers like Netscape and Microsoft Internet Explorer come with FTP clients. Many text and HTML editors also directly support FTP. You can make use of these clients to manipulate Zope objects via FTP.
In the chapter entitled “Using the Zope Management Interface”, you determined the HTTP port of your Zope system by looking at Zope’s start-up output. You can find your Zope’s FTP port by following the same process:
------ 2000-08-07T23:00:53 INFO(0) ZServer Medusa (V1.18) started at Mon Aug 7 16:00:53 2000 Hostname: peanut Port:8080 ------ 2000-08-07T23:00:53 INFO(0) ZServer FTP server started at Mon Aug 7 16:00:53 2000 Authorizer:None Hostname: peanut Port: 8021 ------ 2000-08-07T23:00:53 INFO(0) ZServer Monitor Server (V1.9) started on port 8099
The startup log says that the Zope FTP server is listening to port 8021 on the machine named peanut>. If Zope doesn’t report an “FTP server started”, it likely means that you need to turn Zope’s FTP server on by editing the necessary incantation in your INSTANCE_HOME/etc/zope.conf as detailed in the chapter entitled Installing and Starting Zope.
WS_FTP is a popular FTP client for Windows that you can use to transfer documents and files between Zope and your local computer. WS_FTP can be downloaded from the Ipswitch Home Page.
Too transfer objects between your Zope server and local computer:
If you type in your username and password correctly, WS_FTP shows you what your Zope site looks like through FTP. There are folders and documents that correspond exactly to what your root Zope folder looks like through the web, as shown in the figure below.
Transferring files to and from Zope is straightforward when using WS_FTP. On the left-hand side of the WS_FTP window is a file selection box that represents files on your local machine.
The file selection box on the right-hand side of the WS_FTP window represents objects in your Zope system. Transferring files from your computer to Zope or back again is a matter of selecting the file you want to transfer and clicking either the left arrow (download) or the right arrow (upload).
You may transfer Zope objects to your local computer as files using WS_FTP. You may then edit them and upload them to Zope again when you’re finished.
KDE is one of the many popular window manager for Unix. KDE comes with many applications that is FTP enabled. One such application is Konqueror. Konqueror is a file manager, and also works as a browser.
To use Konqueror to transfer files to your zope site:
Once the correct password is presented, you can now transfer files to and from your zope site.
With Konqueror, you can split the Konqueror view, and make it to mimic WS_FTP, or Midnight Commander (a popular menu based file manager), as shown in the figure below.
We can also edit, create or delete some known Zope objects like folder or ZPT. For instance, to edit a file-like object, right click > Open With > Choose Application > Kate. You can start editing away. Kate will do the necessary when you save your edits.
MS Internet Explorer version 6 and above can also do FTP. To use MS Internet Explorer to move files between your desktop and Zope:
You can then create new Folders and transfer files between Zope and your desktop, as shown in the figure below.
Emacs is a very popular text editor. Emacs comes in two major “flavors”, GNU Emacs and XEmacs. Both of these flavors of Emacs can work directly over FTP to manipulate Zope documents and other textual content.
Emacs will let you treat any remote FTP system like any other local filesystem, making remote management of Zope content a fairly straightforward matter. More importantly, you need not leave Emacs in order to edit content that lives inside your Zope.
To log into Zope, run Emacs. The file you visit to open an FTP connection depends on which text editor you are running: XEmacs or Emacs:
For the typical Zope installation with XEmacs, the filename to open up an FTP session with Zope is /user@localhost#8021:/.
Emacs will ask you for a password before displaying the directory contents. The directory contents of the root folder will look a little like the picture below:
You can visit any of these “files” (which are really Zope objects) by selecting them in the usual Emacs way: enter to select, modify the file, Ctrl-X S to save, etc. You can even create new “files” by visiting a file via “Ctrl-X Ctrl-F”. New files will be created as DTML Document objects unless you have a PUT_factory (described below) installed to specify a different kind of initial object.
The ftp program that ships with Microsoft Windows is incompatible with NTEmacs (the Windows NT version of GNU Emacs). To edit Zope objects via “ange-ftp” under NTEmacs, it requires that you have a special FTP program. This program ships with “Cygwin”, a UNIX implementation for Windows. To use NTEmacs download and install Cygwin and add the following to your .emacs configuration file:
(setq ange-ftp-ftp-program-name "/cygwin/bin/ftp.exe") (setq ange-ftp-try-passive-mode t) (setq ange-ftp-ftp-program-args '("-i" "-n" "-g" "-v" "--prompt" ""))
In addition to the general caveats listed above, using FTP with Zope has some unique caveats:
KDE comes with many applications that is FTP aware. For example, Kate, Kwrite, Quanta, Konqueror, and many more.
To start editing objects with Kate:
Once selected, you can edit to your heart’s content, and click “File” > “Save” when done. Kate will save your edit to your zope server.
With KDE, you can also mount zope onto your dialog box. To do that:
Now, you can edit zope objects in a single click.
WebDAV is an extension to the HTTP protocol that provides features that allow users to concurrently author and edit content on websites. WebDAV offers features like locking, revision control, and the tagging of objects with properties. Because WebDAV’s goals of through the web editing match some of the goals of Zope, Zope has supported the WebDAV protocol for a fairly long time.
WebDAV is a newer Internet protocol compared to HTTP or FTP, so there are fewer clients that support it. There is, however, growing momentum behind the WebDAV movement and more clients are being developed rapidly.
The WebDAV protocol is evolving quickly, and new features are being added all the time. You can use any WebDAV client to edit your Zope objects by simply pointing the client at your object’s URL and editing it. For most clients, however, this will cause them to try to edit the result of rendering the document, not the source>. For DTML or ZPT objects, this can be a problem.
Until clients catch up to the latest WebDAV standard and understand the difference between the source of a document and its result, Zope offers a special HTTP server you can enable. To enable Zope’s WebDAV source server, enter the following in zope.conf:
<webdav-source-server> # valid keys are "address" and "force-connection-close" address 8022 force-connection-close off </webdav-source-server>
This server listens on a different port than your normal HTTP server and returns different, special source content for WebDAV requests that come in on that port.
For more information about starting Zope with a WebDAV source port turned on, see the chapter entitled Installing and Starting Zope. The “standard” WebDAV source port number (according to IANA) is 9800.
Unfortunately, this entire discussion of source vs. rendered requests is too esoteric for most users, who will try the regular port. Instead of breaking, it will work in very unexpected ways, leading to confusion. Until DAV clients support the standard’s provision for discovering the source URL, this distinction will have to be confronted.
Zope has optional support for returning the source version of a resource on the normal HTTP port. It does this by inspecting the user agent header of the HTTP request. If the user agent matches a string you have configured into your server settings, the source is returned.
This is quite useful, as there are few cases in which authoring tools such as cadaver or Dreamweaver will want the rendered version. For more information on this optional support, read the section “Environment Variables That Affect Zope At Runtime” in Installing and Starting Zope.
One program that supports WebDAV is a command-line tool named cadaver. It is available for most UNIX systems (and Cygwin under Windows) from WebDAV.org.
It is typically invoked from a command-line using the command cadaver against Zope’s WebDAV “source port”:
$ cadaver dav:!> open http://saints.homeunix.com:9800/ Looking up hostname... Connecting to server... connected. Connecting to server... connected. dav:/> ls Listing collection `/': (reconnecting...done) succeeded. Coll: Control_Panel 0 Jun 14:03 Coll: ZopeBook 0 Jul 22:57 Coll: temp_folder 0 Jul 19:47 Coll: tutorial 0 Jun 00:42 acl_users 0 Dec 2009 browser_id_manager 0 Jun 14:01 index_html 93 Jul 01:01 session_data_manager 0 Jun 14:01 standard_error_message 1365 Jan 2009 dav:/>
Cadaver allows you to invoke an editor against files while inside the command-line facility:
dav:/> edit index_html Connecting to server... connected. Locking `index_html': Authentication required for Zope on server `saints.homeunix.com': Username: admin Password: Retrying: succeeded. Downloading `/index_html' to /tmp/cadaver-edit-001320 Progress: [=============================>] 100.0% of 93 bytes succeeded. Running editor: `vi /tmp/cadaver-edit-001320'...
In this case, the index_html object was pulled up for editing inside of the vi text editor. You can specify your editor of choice on most UNIX-like systems by changing the EDITOR environment variable.
You can also use cadaver to transfer files between your local directory and remote Zope, as described above for WS_FTP. For more advanced synchronization of data, the sitecopy program can inspect your local and remote data and only transfer the changes, using FTP or DAV.
KDE applications are WebDAV aware. Therefore, we can actually edit Zope objects from any of the KDE applications, such as konqueror, quanta, kate, et cetera.
webdav://your.server:port/ in the konqueror location.
enter the username and password when prompted.
start editing when konqueror presents the Zope workspace.
Click File > Open
in “Open File dialog” “Location”
Browse for your file or start editing.
This chapter focused on FTP and DAV. These are the most popular and mature approaches for integration. However, other choices are available.
For instance, Zope has long supported the use of HTTP PUT, originally implemented by Netscape as “Netscape Publishing”. This allows Netscape Composer, Mozilla Composer, and Amaya to edit and create new pages, along with associated elements such as images and stylesheets.