- Zope - Zope lists

Permissions, files and folders
by Erik Billing 21 Apr '06

21 Apr '06

Hi! I just started looking at zope, so this might be a pretty nooby question, but I didnt find an answere anywhere, so... I want to create a DTML Method that lists the files in a folder that the current user has access to. Problem is that the objectValues-method returns all files simultaniously, so I get a AccessControl.unauthorized.Unauthorized exception when I call the method. I did a litle python script that iterates over the objectValues and catches the errors raised from unauthorized files as folows: files = [] fileIterator = iter(container.objectValues('File')) while True: try: files.append(fileIterator.next()) except Exception, e: if isinstance(e,StopIteration): break else: files.append(e) return files This works fine, except that it's a bit clumsy and has one big error; I catch just any exception that arises from the files.append(fileIterator.next())-call, and swallow it. I've tried catching only the Unauthorized-exception, but an anonymus user does not have access to the Unauthorized-exception, so I can't specify is in my except-declaration without getting a new authorization error. All thaw it works fine to catch all exceptions for a simple directory listing like this, its defiantly nothing I wanna put into a larger application. So my question is, how do I do this in a nicer way? Thanx /Erik

6 9

REQUEST.form variables order
by Gaute Amundsen 21 Apr '06

21 Apr '06

I want to retrieve the form fields in the order that they where submitted in the http POST. I know this has been brought up before, and that the answer is "You cant." http://mail.zope.org/pipermail/zope/2005-October/162460.html For zope to refuse to expose this information to me is really quite arrogant and un-unix like behavior. After all unix lets you do "rm -rf /"... Now in addition to that, it happens that I have almost a hundred forms scattered around maybe 50 sites that all used to use the formmail.pl script, that now use our own zope based workalike. That is, it can not "work-alike" because zope discards the information I need to make it so! To painstakingly alter them all to add this sequence ordering information, just because zope refuses to do as every other scripting system out there that I am aware of, is just out of the queston. My best Idea so far, is to use the apache proxying we use anyway, to run all requests to this url through a small perl or php proxy, that ads the ordering info to the POST. Does anyone have any better ideas? Get hold of the original http data somehow and parse them myself? Patch zope to use a dictionary type that keeps order for req.post? Patch zope to save the ordering as a property in req.post? Regards Gaute Amundsen

6 21

Documentation and Books
by Erik Billing 21 Apr '06

21 Apr '06

I quite recently began looking at Zope and now I'm looking for a good book on the subject. I'm fairly familiar with both Python and webapp development in general, so I'm looking for a book covering pretty much everything about Zope I need to know, rather then an introduction. I've read a few reviews on Amazon and Web Component Development with Zope 3 seams to be a good choice. Does anyone have another to recommend? By the way, I'm surprised how little zope documentation I've found on the web. I'm missing a complete API reference for example. And is there a living Wiki available somewhere? If not, why not start one? Any tips on good recourses are greatly appreciated. ..Erik

4 8

Zope product update question
by Cyrille Bonnet 21 Apr '06

21 Apr '06

Hi there, I have a question regarding product update. I have updated a product (ATContentTypes) on the file system. Upon restarting the server, the new version of the product appears in red in the QuickInstaller (as expected). Even though I haven't re-installed the product, some changes are picked up (for instance, it uses the new schemata for ATDocument). Is this the expected behaviour? What is exactly the difference between a non-installed product on the file system and an installed product? Is the only difference that the Install.py is run when you install the product?? I am using Zope 2.7.4.0, Python 2.3.4. The versions of ATContentTypes are 0.2.0-rc3 (current) and 0.2.1-final (future, uninstalled). Any help appreciated. Cheers, Cyrille

3 4

Regular Expressions
by April Lekin 20 Apr '06

20 Apr '06

Can you use regular expressions in Zope? I'm trying to do a date match, something like this: date = re.match(l_date, '\d\d\d\d\/\d\d/\d\d') Looks like it doesn't like the "re.match"?

3 2

Re: Automatically adding properties (keywords) to folders
by Tres Seaver 20 Apr '06

20 Apr '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Terry Jones wrote: > Hi Tres > > Thanks for your answer. Could I trouble you a little bit more please? > > I don't know where I'd put these fragments (and the last one seems > incomplete, perhaps intentionally?). I'm happy to read and code myself, so > I don't mean to ask for much here, but I'm not sure what to do with your > suggestion. I read version 2.6 of the zope book, and today found out > there's a proto-version 2.7, which I'll take a look at. Note that the "new way" stuff is only for Zope *later* than 2.8.x. In that case, you would define the function in a module somewhere on your $PYTHONPATH (e.g., in $INSTANCE_HOME/lib/python, or in a product) and then register it in a ZCML file which is included from your 'site.zcml' (in $INSTANCE_HOME/etc). > Anyway, thanks again. > > Terry > > | The old way to do that we be to derive your own folder class and > | override '_setObject' / '_delObject' to add your semantics. > | > | The new way (for Zope >= 2.9) would be to register a subscriber for the > | "container" events which are published automatically. Something like > | (untested):: > | > | def update_keywords(event): > | keyword = getattr(event.newparent, 'keyword', None) > | event.object.keyword = None > | event.object.reindexObject() > | > | and then in ZCML:: > | > | <subscriber > | for="zope.app.event.objectevent.ObjectEvent" > | factory="Products.yourproduct.events.update_keywords" Tres. - -- =================================================================== Tres Seaver +1 202-558-7113 tseaver(a)palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFER/Iq+gerLs4ltQ4RAvSAAJ9edkh96NO63lrKF6mkuDeAGYSYWQCgp98g hp/tu+8LtZFYjJvX3rSxuao= =m3sh -----END PGP SIGNATURE----- -- =================================================================== Tres Seaver +1 202-558-7113 tseaver(a)palladion.com Palladion Software "Excellence by Design" http://palladion.com

1 0

Automatically adding properties (keywords) to folders
by Terry Jones 20 Apr '06

20 Apr '06

I'd like to set up a folder in Zope with the property that when an object is put into it, the object has a keyword added to it automatically (and when the object is moved out of the folder, the keyword is removed). If you could do this, you would have a nice way to maintain a collection of such folders and have their contents appear elsewhere in a collection of Plone Smart Folders (using keyword criteria). Can anyone tell me how I should best go about doing this? I can imagine writing some python to run once in a while, find all the contents of the folder, add the keywords, etc. But that's far from being an ideal solution. Any pointers would be much appreciated. Regards, Terry

3 2

Python Generators and Zope question
by Palermo, Tom 20 Apr '06

20 Apr '06

All, I have a site that uses CookieCrumbler for user login. I need to track how many incorrect login attempts a user makes. I am trying to use a python generator to do this but it makes Zope hang when I try to do an invalid login (eg. no password or incorrect password). Here's a snippet: def make_counter(x): while 1: yield x x = x + 1 counter = make_counter(1) security.declarePublic('getUnauthorizedURL') def getUnauthorizedURL(self): ''' Redirects to the login page. ''' req = self.REQUEST resp = req['RESPONSE'] attempt = getattr(req, '_cookie_auth', ATTEMPT_NONE) if attempt == ATTEMPT_NONE: # An anonymous user was denied access to something. page_id = self.auto_login_page retry = '' elif attempt == ATTEMPT_LOGIN: # The login attempt failed. Try again. page_id = self.auto_login_page #retry = '1' retry = counter.next() I added the make_counter function. It seems the culprit is the retry = counter.next() bit. I tried doing this same thing with the make_counter function in an External method and then calling it from a python script like so: counter = context.make_counter(1) return counter.next() In that case, an unauthorized exception is raised complaining about next. I can however, just return the counter which gives me <generator object at 0xb48d56cc>. Am I calling the next method incorrectly or is there something else I'm missing or being dumb about? Thanks, Tom Palermo

2 1

RE: [Zope] Custom 404 - Resource not found
by Andy Yates 20 Apr '06

20 Apr '06

> > ... > >Changing standard_error_message does not seem change this error page. > > Maybe, you made a mistake? Yes, I made a mistake! In standard_error_message: <dtml-if error_message> <dtml-var error_message> <dtml-else> <h2>My TEST Site Error</h2> ... 404 errors hit the dtml-if and other errors, like attribute errors, go to the dtml-else. I was just modifying the else. Thanks!

1 0

Re: [Zope] Permissions, files and folders
by Sascha Welter 19 Apr '06

19 Apr '06

(Tue, Apr 18, 2006 at 12:00:12PM -0400) zope-request(a)zope.org wrote/schrieb/egrapse: > From: "Erik Billing" <erik(a)ekhagen.org> > Thank you, that worked nicely. But I was unable to call the LazyFilter from > the DTML document, I figure I have to import the ZTUtils module first. Is > there a special DTML-tag to do import? > > By the way? Is there some obvious documentation about the different modules > that I have missed? As I mentioned in an earlier letter I'm new to Zope and > I find it very hard to get an overview of all the different modules If you are new to Zope you should drop DTML like a hot potatoe and start doing your logic in python and your presentation in ZPT -- strictly parted. Also don't bother too much with implementing stuff with TTW means ("through the web" - the stuff you do from the ZMI). Better start doing filesystem python products. Read for example http://zopewiki.org/ZopeStarter - including the link to the "new" tutorial from upfrontsystems. The ZopeStarter page is a 5 minute read, but has good pointers to stuff that will get you started in the right directioin. Regards, Sascha

2 1