August 2002 - Zope - Zope lists

using the Session Data Object hooks
by Dennis Allison 12 Aug '02

12 Aug '02

The Session Data Object exposes the Transience Interfaces setDelNotificationTarget(self, f ) and setAddNotificationTarget(self, f) which register f to be called when a session object is added or deleted. The registered function is supposed to accept a single argument, item, the object being added or removed. So, how does one write a PythonScript to do this? Or must it be an External Method and/or a product Extension? It should be straightforward enough as it's part of the normally exposed interface.

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zope vs. mason?
by Hunter Peress 12 Aug '02

12 Aug '02

I'm looking for info on this. Google has nothing to say. I'm NOT!!! looking for a perl vs. python comparison. I'd rather not directly hear a single word about that. I'm looking for a comparison of these two pieces of software as things that implement a language into html. Can someone guide me?

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Multiple CMF sites on one server
by Russell Hires 11 Aug '02

11 Aug '02

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everyone, I don't know if it's documented, but I had a problem with CMF dealing with the same username on different cmf portal sites that were on the same server. IOW, I could click on the "Join" link, as user "Rusty" for CMFsite1, and be added; but if I try to join as user "Rusty" on CMFsite2, then I get an error. This is bad. Should I file a bug report on this? And is there a work around? Russell - -- Linux -- the OS for the Renaissance Man -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9VdBdAqKGrvVshJQRAiiDAKDYZdGkUxGgGQoVBSK9Tnb4aVYDrgCeMhQY mUfyf4QES8LFP66hNr76KyU= =ygDo -----END PGP SIGNATURE-----

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unlimited SET?
by 3205 5361 1215 9784 11 Aug '02

11 Aug '02

Hello zope, i posted this to zope-db, but nobody replied... there is this SET type in mysql... the problem is it's bit based, and can contain up to 32 elements... what if i have lot more stuff? i have 2 tables, the first one is for the product (i'm building an e-commerce site) and the other has options, that can be selected for the product. i thought of keeping the "option1,option2,option3" structure, but make it TEXT instead of SET, and doing the whole searching/adding/deleting logic from code and not mysql. but it seems a bit complicated for first. is there a better workaround? whats the practice for this? i have ran into this problem several times, and i am sure there is a good working practice for this under zope;D thanks a lot, k. -- don't believe everything you think

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Re: [Zope] Prevent recursive and multiple URLs in Zope
by Urs van Binsbergen 11 Aug '02

11 Aug '02

Hello Dieter Thank you very much for your answer! > > a) Philosophically: As the name "UNIQUE resource locator" already says: > > it is generally not good to have the same content available via different > > locators. >Maybe, your philosophical argument is weakened when you learn >that URL stands for "*UNIVERSAL* resource locator". Uh-oh, bad one ;-) Sorry for this. >It is quite common to have the same resource accessed through different >URLs: often the same resource can be accessed both via HTTP and FTP, >often the same (local) resource can be accessed with the "file", the "ftp" >and the "http" protocol, often the same resource can be accessed >via both "ftp" and "webdav" (wich is HTTP based). Yeah, and some sites are also mirrored in different locations, and so on. This makes sense, of course. But: I am talking about "different URLs for the same thing on the same protocol on the same location". And I still insist: I feel uneasy if I know my stuff is accessible under a fantasy URL like http://mydomain/my_stuff/index_html/my_stuff/index_html/my_stuff/index_html /... (ad infinitum) > > b) Technically: Working with relative links becomes unreliable and > > dangerous. Problem #1 causes a relative URL to sometimes work and > > sometimes not work, depending on whether the visitor accesses "foo/bar/" > > or "foo/bar". >Only, when you do strange strings. Usually, Zope sets the HTML base >tag, such that it does not matter whether the user uses "foo/bar/" >or "foo/bar". It does? Not with my installation (2.5)! I am using the default header/footer, or looking at a zpt page (with the default code auto-created after adding it) - no base href appears. Is this a setting I must change? > > Problem #2 makes relative links to be the door to infinite > > recursion. A simple link like "<a href="foo/">clickme</a>" will be the > > trap, where tumb spiders will loose themselves in a infinite loop (this > > was discussed shortly on this list under the subject "htdig indexing > > problem". >When you use relative links in the same way you are forced to do it >in a file system based publishing environment, there will be no >infinite recursion. Simply avoid relative links containing a "/" >not preceeded by "..". Use an absolute URL otherwise. Ok, but who can guarantee me that anybody working with the system (especially the non-technical guys) will always stick to this rule? Nobody! Errare humanum est. Unless I validate all user-generated code I can't expect this is done in a correct way all the time. >You may also learn about SiteAccess AccessRules (--> documentation >on Zope.org) As I wrote I already checked this out: "I tried to do it using an Access Rule with SiteAccess2, but this doesn't seem to lead to a sensible solution, because an Access Rule is invoked when a folder is traversed FIRST, and in this moment it is not known which type of object the URL will call at last. So there should be something like an Access Rule to be called _at the very end_ of the traversal/acquisition process." Kind regards, Urs ------------------------- Urs van Binsbergen van.binsbergen(a)taktik.ch bureau taktik GmbH Zentralstrasse 76b 8003 Zürich Telefon 01 450 34 05 -------------------------

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Developer ZEO setup: server and two clients on one machine, one for debugging?
by Jeff Kowalczyk 11 Aug '02

11 Aug '02

I'm interested in setting up a ZEO configuration to have a console debugger active at the same time requests are available through the browser. I haven't tried ZEO yet because I'm experimenting with Zope on a single machine, and its a laptop using DHCP at that, so I don't have a ton of flexibility on adding additional IP addresses, although maybe defining aliases in windows' HOSTS file will do. http://www.zope.org/Members/dshaw/AdvancedSiteSetup Is it practical/possible to set up the ZEO server and two clients, one for requests and one for console debugging, on a WindowsXP Laptop with 1 NIC (DHCP, 1 IP addr and 'localhost')? I need advice on what and where to install various duplicate Zope components when its all going on one machine. Is Zope 2.6 CVS a better version to run in this context, since there are no production-ready issues here? Is the current ZEO ready to work with Zope 2.6 CVS? Thanks for any info. I'll be sure to write up any sucessful configuration that comes out of this.

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RE: [Zope] oops! over-restricted access to part of my zope server....
by Dieter Maurer 11 Aug '02

11 Aug '02

Greg Conway writes: > Interestingly enough though, when I later restricted my access to part of a > site with a combination of an exUserFolder and a badly-placed SiteRoot, the > emergency user couldn't help me.... > > Is there anything more powerful than this? I've restored that part of my > site for now, but just for future reference! The Emergency user can cure any permission problems (at least, this is as it should be). But, it is powerless against traversal magic (like that of SiteRoots). The SiteAccess product (SiteRoot belongs to it) comes with its only rules to inhibit the magic. Read the corresponding documentation. Dieter PS: Please stay on the list (such that I can often write: "search the mailing list archives).

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Different Sorting Methods using DTML-IN
by Alexander M Hottenstein 11 Aug '02

11 Aug '02

I am attempting to use several different sorting variables on a dtml-in of one type of object. Depending on several booleens that determine which sorting methods will be used. I know that I cannot use a dtml-if to determine which dtml-in to use, but do not want to have several different blocks of code for each sort that I use. Does anyone have any ideas of another way to solve this problem? - Alex Hottenstein

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Re: [ZODB-Dev] zope crashes on opening management screen
by Chris Withers 11 Aug '02

11 Aug '02

Anthony Connell wrote: > Hi, > > I hope this is the right list (my apologies if it is not). It was the wrong list, so I've redirected it ;-) > My problem is this, firstly it says this > > C:\Program Files\Zope>"C:\Program Files\Zope\bin\python.exe" "C:\Program <snip> > Inet socket port: 8090 This is perfectly normal and exactly what I'd expect. > Then when i go to the management interface in my browser this is output > in the dos window. do you actually get any of the ZMI pages back or do you get an error? If so, what error? > File "C:\Program Files\Zope\ZServer\medusa\logger.py", line 65, in > maybe_flush > > self.file.flush() > IOError: [Errno 9] Bad file descriptor Haven't personally seen this before, maybe Google for the error? http://zope.nipltd.com/public/lists/zope-archive.nsf/ByKey/6350C8C5D6E964BA ...hmmm, do you have ZoneAlarm or other firewall software installed? > Further could anyone tell me why in the code above does it contain the > line : > user213040188002.dial.netline.net.uk That is the domain name of your machine. so, Zope tells you what domain and what port its servers are listening on. cheers, Chris

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Tools to assist setting access permissions and proxies
by Dennis Allison 11 Aug '02

11 Aug '02

The fine grain control over access is both a virtue and a vice. | :-) Has anyone written a tool to examine a site (or a subtree of a site) and output current permission states? Even better would be a tool that would look at the site and generate the settings based upon a set of rules and policys. When a site gets complex keeping security setting correct is difficult.

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