June 2011 - web-devel

"Wiki" section of the Yesod doc site
by Michael Snoyman 13 May '12

13 May '12

Hi everyone, I've added a new section to the Yesod doc site: the wiki[1]. This section is intended to be user-writable, so if you have any content you'd like to submit, please go ahead. In particular, this section contains the "Powered by Yesod" page: please add your sites. Unfortunately, the list from the old wiki was lost when my previous VPS died. (All my databases were backed up, I just forgot to backup the Wiki content as well...) Michael [1] http://www.yesodweb.com/page/wiki

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[ Newbie ] [ MongoDB ] Using MongoDB Persistent backend
by Kamil Ciemniewski 03 Aug '11

03 Aug '11

Hi all, I've got some "newbie" problems using MongoDB as backend in Persistent. Basically I've got my app type defined as: data MyApp = MyApp { getStatic :: Static -- ^ Settings for static file serving. , connPool :: ConnPool Host } And I made it an instance of YesodPersist by: instance YesodPersist MyApp where type YesodDB MyApp = MongoDBReader Host runDB db = liftIOHandler $ fmap connPool getYesod >>= (\p -> return (p, "localhost")) >>= runMongoDBConn db And I made it an instance of YesodAuth as well by: instance YesodAuth MyApp where type AuthId MyApp = UserId loginDest _ = RootR logoutDest _ = RootR getAuthId creds = runDB $ do x <- getBy $ UniqueUser $ credsIdent creds case x of Just (uid, _) -> return $ Just uid Nothing -> do fmap Just $ insert $ User (credsIdent creds) Nothing authPlugins = [ authEmail ] I've defined User model as yesod scaffold tool defines it. Now, when I try to compile it i get: No instances for (Control.Monad.Context.Context Database.MongoDB.Connection.MasterOrSlaveOk (GGHandler s MyApp IO), Control.Monad.Context.Context Database.MongoDB.Query.Database (GGHandler s MyApp IO), Control.Monad.Context.Context Database.MongoDB.Internal.Protocol.Pipe (GGHandler s MyApp IO), Control.Monad.Context.Context Database.MongoDB.Query.WriteMode (GGHandler s MyApp IO), Control.Monad.Throw.Throw Database.MongoDB.Query.Failure (GGHandler s MyApp IO)) arising from a use of `insert' Possible fix: add instance declarations for (Control.Monad.Context.Context Database.MongoDB.Connection.MasterOrSlaveOk (GGHandler s MyApp IO), Control.Monad.Context.Context Database.MongoDB.Query.Database (GGHandler s MyApp IO), Control.Monad.Context.Context Database.MongoDB.Internal.Protocol.Pipe (GGHandler s MyApp IO), Control.Monad.Context.Context Database.MongoDB.Query.WriteMode (GGHandler s MyApp IO), Control.Monad.Throw.Throw Database.MongoDB.Query.Failure (GGHandler s MyApp IO)) In the expression: insert In the second argument of `($)', namely `insert $ User (credsIdent creds) Nothing' In the expression: fmap Just $ insert $ User (credsIdent creds) Nothing The problem is probably very trivial.. But I've got no ideas how to fix it. Best regards Kamil Ciemniewski

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libstdc++ missing during yesod installation on OS X
by Alexandros Salazar 28 Jul '11

28 Jul '11

Hi all, I tried installing the haskell platform and yesod from scratch, but it failed during the installation of double-conversion-0.2.0.0 with the following error: Loading package double-conversion-0.2.0.0 ... <command line>: can't load .so/.DLL for: stdc++ (dlopen(libstdc++.dylib, 9): image not found) cabal: Error: some packages failed to install: yesod-auth-0.6.0 failed during the building phase. The exception was: ExitFailure 1 I am running Snow Leopard 10.6.8. Has anyone run into this problem? Did you figure out how to avoid it/work around it? It seems it has something to do with libstdc++ being statically linked on OS X, but I can't figure out the details. Thanks, Alexandros

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[yesod] Messages / i18n question: how to handle "xx-xx" languages
by Markus Barenhoff 08 Jul '11

08 Jul '11

Hi! I'am using mkMessage to create the i18n stuff for a project. I've created a en.msg and a de.msg and everything is running smoothly and I can use the message consts in my hamlet template with _{}. But I'am a little bit unsure whats the best practise to handle the language parameters like 'de-de' or 'en-us'. The Message framework does not seem to handle those cases by using en.msg for en-us if en-us.msg is not found. But copying the message files also seems not a good option. Putting a "take 2" version of the language to the _LANG cookie var works, but needs a reload to become active... Any suggestions / best practice advices? Regards Markus

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On moving Yesod-specific discussion to a separate list
by Jasper Van der Jeugt 30 Jun '11

30 Jun '11

Hello all, I was wondering if it would be possible to direct Yesod-specific discussion to a separate mailing list. I do not have any disrespect towards Yesod, the main problem is that one can only read some finite number of mailing lists before being overwhelmed. A certain portion of Yesod-related mails certainly belong on the web-devel list. I'm thinking of e.g. RFC's, announcements, libraries. These are all mails which are of interest to the webdev community as a whole. However, there's a difference between Yesod-related and Yesod specific. Personally, I am not interested in "How to do X in Yesod" mails, because I don't know much about Yesod, and sometimes it's hard to manually "filter" this mailing list before reading it. I think it would benefit the two types of readers if we could move Yesod-specific discussion to a separate mailing list. Cheers, Jasper

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Re: [web-devel] [yesod][newbie] Yesod applications on foreign architectures
by Jack Henahan 30 Jun '11

30 Jun '11

Forgot to CC the list twice. Begin forwarded message: > From: Jack Henahan <jhenahan(a)uvm.edu> > Date: June 30, 2011 2:16:26 PM EDT > To: Michael Snoyman <michael(a)snoyman.com> > Subject: Re: [web-devel] [yesod][newbie] Yesod applications on foreign architectures > > Hmm. I think it might just be simpler to buy some cheap hosting and get my university to direct my suffix to that IP. :D I'll definitely keep poking around for options in the meantime. I was just looking for any input before I did anything crazy on their servers. Thanks for all the help, Michael. If I find anything earth-shattering, I'll be sure to post it to the list. > > On Jun 30, 2011, at 2:12 PM, Michael Snoyman wrote: > >> Doh, I didn't pay close enough attention to the link I sent you. GHC >> 6.4 definitely will not support Yesod, you need at least 6.12. Here >> are two really bad options that come to mind: >> >> * Compile on Windows, and run via wine. (Never tried.) >> * Install a Linux virtual machine on the AIX machine. >> >> MIchael >> >> On Thu, Jun 30, 2011 at 9:07 PM, Jack Henahan <jhenahan(a)uvm.edu> wrote: >>> Shall do. I thought a VM or local build might be the only way, and I hope not much has changes in AIX from 4.1 to 5.1. Dependency chasing is going to be the hardest part, really. I'm not sure how compatible Yesod and ghc-6.4 will be with one another. Perhaps I'll make a project of it. The environment has most of the necessary build tools, as far as I can see, so I can probably pull it off as long as I play nicely. There wouldn't happen to be a way to get a gcc config/makefile combo out of a Yesod project, would there? :D >>> >>> On Jun 30, 2011, at 1:53 PM, Michael Snoyman wrote: >>> >>>> It appears that there is GHC for AIX[1]. I think your best bet is to >>>> set up a local system or virtual machine running AIX, build your >>>> executables there and then distribute to the server. Though I'm not >>>> sure how easy it is to get a virtual machine set up with AIX. I'd be >>>> interested to hear how this goes, please keep us posted. >>>> >>>> Michael >>>> >>>> [1] http://www.haskell.org/ghc/download_ghc_64#powerpcaix >>>> >>>> On Thu, Jun 30, 2011 at 8:23 PM, Jack Henahan <jhenahan(a)uvm.edu> wrote: >>>>> I'd like to put a small Yesod application on my university webspace, but they're on AIX 4.1, while I'm on OS X.6. Can I build for their architecture (it's gotta be PPC or i386, I think) from where I am, or am I going to need to look for some other way around the issue? >>>>> >>>>> >>>>> ==== >>>>> "Computer Science is no more about computers than astronomy is about telescopes." >>>>> -- Edsger Dijkstra >>>>> ==== >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> web-devel mailing list >>>>> web-devel(a)haskell.org >>>>> http://www.haskell.org/mailman/listinfo/web-devel >>>>> >>>>> >>> >>> >>> >>> ==== >>> "Computer Science is no more about computers than astronomy is about telescopes." >>> -- Edsger Dijkstra >>> ==== >>> >>> >>> >>> >>> >>> > > > > ==== > "Computer Science is no more about computers than astronomy is about telescopes." > -- Edsger Dijkstra > ==== > > >

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ANNOUNCE: mime-mail-ses 0.0.0
by Michael Snoyman 30 Jun '11

30 Jun '11

Hi all, I'd like to announce the first release of mime-mail-ses[1]. This provides easy integration between the mime-mail package[2] and Amazon's Simple Email Service. This package was written for the Haskellers website[3], purely because I despise setting up mail servers. There aren't many more features planned, though hopefully in the future it will integrate more closely with Aristid's aws package[4]. Also, a big thank you to Thomas DuBuisson for crypto-api[5] and Vincent Hanquez for cryptohash[6]. Those two packages make it very easy to write applications that require cryptographic authentication. Michael [1] http://hackage.haskell.org/package/mime-mail-ses [2] http://hackage.haskell.org/package/mime-mail [3] http://www.haskellers.com/ [4] http://hackage.haskell.org/package/aws [5] http://hackage.haskell.org/package/crypto-api [6] http://hackage.haskell.org/package/cryptohash

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Re: [web-devel] [yesod][newbie] Yesod applications on foreign architectures
by Jack Henahan 30 Jun '11

30 Jun '11

Forgot to CC the list. Begin forwarded message: > From: Jack Henahan <jhenahan(a)uvm.edu> > Date: June 30, 2011 2:07:34 PM EDT > To: Michael Snoyman <michael(a)snoyman.com> > Subject: Re: [web-devel] [yesod][newbie] Yesod applications on foreign architectures > > Shall do. I thought a VM or local build might be the only way, and I hope not much has changes in AIX from 4.1 to 5.1. Dependency chasing is going to be the hardest part, really. I'm not sure how compatible Yesod and ghc-6.4 will be with one another. Perhaps I'll make a project of it. The environment has most of the necessary build tools, as far as I can see, so I can probably pull it off as long as I play nicely. There wouldn't happen to be a way to get a gcc config/makefile combo out of a Yesod project, would there? :D > > On Jun 30, 2011, at 1:53 PM, Michael Snoyman wrote: > >> It appears that there is GHC for AIX[1]. I think your best bet is to >> set up a local system or virtual machine running AIX, build your >> executables there and then distribute to the server. Though I'm not >> sure how easy it is to get a virtual machine set up with AIX. I'd be >> interested to hear how this goes, please keep us posted. >> >> Michael >> >> [1] http://www.haskell.org/ghc/download_ghc_64#powerpcaix >> >> On Thu, Jun 30, 2011 at 8:23 PM, Jack Henahan <jhenahan(a)uvm.edu> wrote: >>> I'd like to put a small Yesod application on my university webspace, but they're on AIX 4.1, while I'm on OS X.6. Can I build for their architecture (it's gotta be PPC or i386, I think) from where I am, or am I going to need to look for some other way around the issue? >>> >>> >>> ==== >>> "Computer Science is no more about computers than astronomy is about telescopes." >>> -- Edsger Dijkstra >>> ==== >>> >>> >>> >>> >>> >>> _______________________________________________ >>> web-devel mailing list >>> web-devel(a)haskell.org >>> http://www.haskell.org/mailman/listinfo/web-devel >>> >>> > > > > ==== > "Computer Science is no more about computers than astronomy is about telescopes." > -- Edsger Dijkstra > ==== > > >

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[yesod][newbie] Yesod applications on foreign architectures
by Jack Henahan 30 Jun '11

30 Jun '11

I'd like to put a small Yesod application on my university webspace, but they're on AIX 4.1, while I'm on OS X.6. Can I build for their architecture (it's gotta be PPC or i386, I think) from where I am, or am I going to need to look for some other way around the issue? ==== "Computer Science is no more about computers than astronomy is about telescopes." -- Edsger Dijkstra ====

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Re: [web-devel] HttpOnly
by Chris Smith 30 Jun '11

30 Jun '11

The current situation, technically speaking, is that Snap has no official sessions package; but that will be changing in 0.6. The sessions package that will be part of 0.6 does, I believe, use your clientsession package, unless that's changed since I last looked. (I happen to be maintaining my own alternative package for typed sessions, which has two backends -- one using server-side state, and the other using your clientsession package. But that's not an official part of Snap.) Your cookie package is not likely to be useful for Snap, since parsing and rendering of cookie-related headers is already included in snap-core (and, I think, belongs there; it's a rather central part of HTTP; if we parse any headers at all, we ought to include cookies). As for http-only, I definitely think it's a good idea, in pretty much all cases where cookies are used to pass through server-side state. The kinds of cookies generated by clientsession are not really vulnerable to cookie-stealing attacks anywa due to the encryption that goes on, so it's really just an extra layer of security. But the same encryption guarantees that there's no possible use for trying to access and read those particular cookies in JavaScript, so adding the http-only flag doesn't actually prevent anything useful, and there's no reason *not* to do it. On Jun 30, 2011 7:59 AM, "Michael Snoyman" <michael(a)snoyman.com> wrote:

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