June 2021 - Pharo-users - lists.pharo.org

Re: Zn and AWS - retrieving object versions?

by Tim Mackinnon

Hi Sven - actually I think its not just the versions thing - I canât get filtering to work on the standard query either: client keysIn: âmtt-data' query: (Dictionary with: 'prefix'->'sampleâ). Given a normal query works, there must be something extra that is being missed/added that impacts things. Tim > On 17 Jun 2021, at 17:19, Tim Mackinnon <tim(a)testit.works> wrote: > > Hi Sven - thanks for taking a quick look, this change did stop me getting an immediate error - but I seem to get no results back. > > Digging into it a bit more - I seem to be issuing the GET request as indicated by https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectVersions.html > > e.g. > > GET /?versions HTTP/1.1 > > Headers: > a ZnMultiValueDictionary('User-Agent'->'Zinc HTTP Components 1.0 (Pharo/8.0)â > 'Accept'->'*/*' 'Host'->'mtt-data.s3.amazonaws.comâ > 'Date'->'Thu, 17 Jun 2021 16:08:44 GMTâ > 'Authorization'->'AWS AKIAIP2xxxxxxx:DqPPbDyyyyyâ) > > From the spec (which Iâm no expert on) - the get command looks right (the other params are optional) and the Bucket name is prefixed onto s3.amazonaws.com in the header. > > But is seems that I am getting a 200 - 403 response : > "a ZnResponse(200 OK application/xml 1899B)" > HTTP/1.1 403 Forbidden > > (Aside - the code should possibly handle this better - the spec seems to say that response content needs to be interpreted - but thatâs something I can look to help with when we know the actual issue). > > But Iâm a bit mystified why the previous: client keysIn: 'mtt-dataâ > Invocation would work, but this seemingly extra step would be forbidden. My IAM role says it has full S3 access, so Iâm not sure if this is still that we havenât got the right fix or if its something environmental. Iâm not sure what to do - if you have another idea, Iâm happy to be a guniea pig to try it. > > Tim > > > >> On 17 Jun 2021, at 09:06, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: >> >> Hi Tim, >> >> It has been a very long time since I last looked at this code. It is a good thing that at least part of it still works. >> >> Just by reading the code and reasoning about your problem, I would suggest you try the following change: >> >> In ZnAWSS3RequestSignatureTool>>#canonicalStringFor: replace the last >> >> request uri pathPrintString >> >> by >> >> request uri pathQueryFragmentPrintString >> >> I did not try this myself, so it might not solve your issue. >> >> Please let me know if this works. >> >> Sven >> >>> On 17 Jun 2021, at 03:05, Tim Mackinnon <tim(a)testit.works> wrote: >>> >>> Hi everyone - Iâm wondering if someone knows the trick to listing object versions in AWS S3? >>> >>> I was previously using a non-Zn library (there are a few around - but they are quite old and Iâm not sure how much they are maintained) - however I hadnât realised that Zn actually supports S3 until I read it a bit carefully and realised that I needed to load an extra AWS group. >>> >>> So - I have a bucket that is versioned, and I wanted to read the versions of an object - and hopefully be able to read the contents of an older version. >>> >>> I can list the contents of a bucket, but when I try to read the versions of an object - I get a forbidden error - which when I dig deeper gives a stranger explanation? >>> >>> I have confirmed that the AWS CLI is able to list versions in that bucket - so Iâm a bit confused what the issue might be? >>> >>> (client := ZnAWSS3Client new) >>> accessKeyId: 'xxx'; >>> secretAccessKey: âyyyyy'; >>> checkIntegrity: true. >>> >>> client buckets. âWorks" >>> client keysIn: 'mtt-dataâ. âWorks" >>> >>> client at: 'mtt-data' -> 'sample.txtâ. âWorks" >>> >>> client keysIn: 'mtt-data' query: (Dictionary with: 'versions'->nil). âGives an error?â >>> >>> >>> HTTP/1.1 403 Forbidden >>> >>> <?xml version="1.0" encoding="UTF-8"?> >>> <Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><AWSAccessKeyId>xxx</AWSAccessKeyId><StringToSign>GET >>> >>> >>> Has anyone tried doing this - Iâm sure there is something really simple that I am missing? >>> >>> Tim

June 17, 2021

Re: Zn and AWS - retrieving object versions?

by Tim Mackinnon

Hi Sven - thanks for taking a quick look, this change did stop me getting an immediate error - but I seem to get no results back. Digging into it a bit more - I seem to be issuing the GET request as indicated by https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectVersions.html e.g. GET /?versions HTTP/1.1 Headers: a ZnMultiValueDictionary('User-Agent'->'Zinc HTTP Components 1.0 (Pharo/8.0)â 'Accept'->'*/*' 'Host'->'mtt-data.s3.amazonaws.comâ 'Date'->'Thu, 17 Jun 2021 16:08:44 GMTâ 'Authorization'->'AWS AKIAIP2xxxxxxx:DqPPbDyyyyyâ) >From the spec (which Iâm no expert on) - the get command looks right (the other params are optional) and the Bucket name is prefixed onto s3.amazonaws.com in the header. But is seems that I am getting a 200 - 403 response : "a ZnResponse(200 OK application/xml 1899B)" HTTP/1.1 403 Forbidden (Aside - the code should possibly handle this better - the spec seems to say that response content needs to be interpreted - but thatâs something I can look to help with when we know the actual issue). But Iâm a bit mystified why the previous: client keysIn: 'mtt-dataâ Invocation would work, but this seemingly extra step would be forbidden. My IAM role says it has full S3 access, so Iâm not sure if this is still that we havenât got the right fix or if its something environmental. Iâm not sure what to do - if you have another idea, Iâm happy to be a guniea pig to try it. Tim > On 17 Jun 2021, at 09:06, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > Hi Tim, > > It has been a very long time since I last looked at this code. It is a good thing that at least part of it still works. > > Just by reading the code and reasoning about your problem, I would suggest you try the following change: > > In ZnAWSS3RequestSignatureTool>>#canonicalStringFor: replace the last > > request uri pathPrintString > > by > > request uri pathQueryFragmentPrintString > > I did not try this myself, so it might not solve your issue. > > Please let me know if this works. > > Sven > >> On 17 Jun 2021, at 03:05, Tim Mackinnon <tim(a)testit.works> wrote: >> >> Hi everyone - Iâm wondering if someone knows the trick to listing object versions in AWS S3? >> >> I was previously using a non-Zn library (there are a few around - but they are quite old and Iâm not sure how much they are maintained) - however I hadnât realised that Zn actually supports S3 until I read it a bit carefully and realised that I needed to load an extra AWS group. >> >> So - I have a bucket that is versioned, and I wanted to read the versions of an object - and hopefully be able to read the contents of an older version. >> >> I can list the contents of a bucket, but when I try to read the versions of an object - I get a forbidden error - which when I dig deeper gives a stranger explanation? >> >> I have confirmed that the AWS CLI is able to list versions in that bucket - so Iâm a bit confused what the issue might be? >> >> (client := ZnAWSS3Client new) >> accessKeyId: 'xxx'; >> secretAccessKey: âyyyyy'; >> checkIntegrity: true. >> >> client buckets. âWorks" >> client keysIn: 'mtt-dataâ. âWorks" >> >> client at: 'mtt-data' -> 'sample.txtâ. âWorks" >> >> client keysIn: 'mtt-data' query: (Dictionary with: 'versions'->nil). âGives an error?â >> >> >> HTTP/1.1 403 Forbidden >> >> <?xml version="1.0" encoding="UTF-8"?> >> <Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><AWSAccessKeyId>xxx</AWSAccessKeyId><StringToSign>GET >> >> >> Has anyone tried doing this - Iâm sure there is something really simple that I am missing? >> >> Tim

June 17, 2021

Re: Spec Gtk Applications - Implementing File open/save/(print?) dialogs

by kmo

Wow! Thanks so much Esteban for taking all the time and trouble to provide this. I'll have a play with it. Ken -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

June 17, 2021

Re: Spec Gtk Applications - Implementing File open/save/(print?) dialogs

by Esteban Lorenzano

lol, I just realised I forgot to push my changes to it (I am working on fixing a leak on dialogs, so probably you will need to pull again soon, btw :P) anyway, you can pull gtk-bindings now and you will have the right accessors. Also, I have been working on a wrapper to help with the Gtk details (the idea is to integrate something to the newtools, so I need something that eventually can be mapped to a morphic component too ;) ) You can file in the exports I sending you (check the right order ;) ) And you should be able to execute what is in NmFileChooserDialog class>>example to get something like this: I think this can point you in the right direction. BUT! This is very early work... do not expect something ready for production :) Esteban On Jun 17 2021, at 2:47 pm, kmo <voxkmp(a)gmail.com> wrote: > Thanks Esteban. That's what I needed. I've got the dialog to open, like this > - > > generateRoseButton action: [ > (GtkFileChooserDialog newOpenFileTitle: 'Hello') > showAll; > run ] > > > But how do you get the chosen filename back? > Ken > > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >

June 17, 2021

Re: Spec Gtk Applications - Implementing File open/save/(print?) dialogs

by kmo

Thanks Esteban. That's what I needed. I've got the dialog to open, like this - generateRoseButton action: [ (GtkFileChooserDialog newOpenFileTitle: 'Hello') showAll; run ] But how do you get the chosen filename back? Ken -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

June 17, 2021

Re: Spec Gtk Applications - Implementing File open/save/(print?) dialogs

by Esteban Lorenzano

Hello, if you want to play with the direct Gtk dialog, you have GtkFileChooserDialog... take a look at it :) Esteban On Jun 17 2021, at 1:45 pm, kmo <voxkmp(a)gmail.com> wrote: > Hi - > > When writing a Gtk app using Pharo Spec2 are there any facilities for > standard system dialogs - open file / save file / etc - or do you have to > create them from scratch yourself (perhaps using SpDialogPresenter) ? > > Thanks in advance for any clarification. > Ken > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >

June 17, 2021

Spec Gtk Applications - Implementing File open/save/(print?) dialogs

by kmo

Hi - When writing a Gtk app using Pharo Spec2 are there any facilities for standard system dialogs - open file / save file / etc - or do you have to create them from scratch yourself (perhaps using SpDialogPresenter) ? Thanks in advance for any clarification. Ken -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

June 17, 2021

Re: Reading http post data using Zinc

by Davide Varvello

Hi Sven, I'm sending a FormData, so the right code is in ZnDefaultServerDelegate>>#formTest3: that you pointed out. Thank you very much. To help other people of the list, I summarize that in case of multipart form-data you have to read the entity and its parts, for example: (aRequest entity partNamed: #myPartName) fieldValueString. or also: aRequest entity parts first fieldName. aRequest entity parts first fieldValue Cheers Davide Sven Van Caekenberghe-2 wrote > Hi Davide, > >> On 16 Jun 2021, at 23:17, Davide Varvello via Pharo-users < > pharo-users@.pharo > > wrote: >> >> Hi Guys, >> I'm posting from an http form and I'm wondering how to read data from the >> post. It seems the request should give a ZnMultiPartFormDataEntity, but I >> can't find how to use it. >> >> Can you help me please? >> Davide >> >> >> >> >> -- >> Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > > It depends on how the form is posted (there are two approaches). > > A working example of both can be found in > ZnDefaultServerDelegate>>#formTest2: and #formTest3: > > ZnServerTest>>#testFormTest2: and #testFormTest3: exercise this > functionality > > Basically, you just take the entity from the request and use it. > > HTH, > > Sven -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

June 17, 2021

Re: Zn and AWS - retrieving object versions?

by Sven Van Caekenberghe

Hi Tim, It has been a very long time since I last looked at this code. It is a good thing that at least part of it still works. Just by reading the code and reasoning about your problem, I would suggest you try the following change: In ZnAWSS3RequestSignatureTool>>#canonicalStringFor: replace the last request uri pathPrintString by request uri pathQueryFragmentPrintString I did not try this myself, so it might not solve your issue. Please let me know if this works. Sven > On 17 Jun 2021, at 03:05, Tim Mackinnon <tim(a)testit.works> wrote: > > Hi everyone - Iâm wondering if someone knows the trick to listing object versions in AWS S3? > > I was previously using a non-Zn library (there are a few around - but they are quite old and Iâm not sure how much they are maintained) - however I hadnât realised that Zn actually supports S3 until I read it a bit carefully and realised that I needed to load an extra AWS group. > > So - I have a bucket that is versioned, and I wanted to read the versions of an object - and hopefully be able to read the contents of an older version. > > I can list the contents of a bucket, but when I try to read the versions of an object - I get a forbidden error - which when I dig deeper gives a stranger explanation? > > I have confirmed that the AWS CLI is able to list versions in that bucket - so Iâm a bit confused what the issue might be? > > (client := ZnAWSS3Client new) > accessKeyId: 'xxx'; > secretAccessKey: âyyyyy'; > checkIntegrity: true. > > client buckets. âWorks" > client keysIn: 'mtt-dataâ. âWorks" > > client at: 'mtt-data' -> 'sample.txtâ. âWorks" > > client keysIn: 'mtt-data' query: (Dictionary with: 'versions'->nil). âGives an error?â > > > HTTP/1.1 403 Forbidden > > <?xml version="1.0" encoding="UTF-8"?> > <Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><AWSAccessKeyId>xxx</AWSAccessKeyId><StringToSign>GET > > > Has anyone tried doing this - Iâm sure there is something really simple that I am missing? > > Tim

June 17, 2021

R: Re: Rounding in Floats

by Lorenzo

You are right! Lorenzo -----Messaggio originale----- Da: ducasse [mailto:stepharo@netcourrier.com] Inviato: mercoledÃ¬ 16 giugno 2021 22:44 A: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> Oggetto: [Pharo-users] Re: Rounding in Floats Richard As I said it thousands of times, - first we are not good in math - second Pharo is what we have and we never said that it is the best system ever we just enhanced daily - third, I never saw a piece of code from you. - if you want to see Pharo improve (which I doubt about) just send us code and tests Iâm sad that you systematically ignore any of my emails on the topic. You could have an impact but you prefer to hide yourselves in your tower. Good luck with it. S.

June 17, 2021