Mailman 3 August 2012 - Twisted

[Twisted-Python] JOB OPENING Python, Twisted, Javascript
by John Spencer 14 Aug '12

14 Aug '12

We have a client here in MA looking for a Sr or Prin level consultant with a strong background in Python and Javascript. Experience with Twisted is a plus as is any Dojo experience. Work must be done on site and must be able to interview in person as well. Please call or email me with any questions or send me a Word version of your resume for consideration. You resume will never be sent anywhere without your prior approval. Regards, John Spencer Connected Systems Partners Connecting Top Talent with Top Companies 978-455-5550 x208 978-621-9743 cell jspencer(a)connectedsp.com www.connectedsp.com<www.connectedsp.com%20> GET CONNECTED! Unless otherwise explicitly instructed by sender, all information in this email is considered confidential and intended for the view and use of the recipient(s) only.

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[Twisted-Python] About CONNECT method and Proxy HTTPS
by Román Ramírez 14 Aug '12

14 Aug '12

Hello all, This is my first email in this list so thanks everyone in advance and Hello :) I have a quick question about the Proxy class and the CONNECT method (for tunneling SSL). I've already solved the certificate issues as I use a fixed *.testdomain.com certificare for my service. What I cannot manage to solve is how to manage the real request after setting up the tunnel. Let me explain, whenever a browser wants to tunnel through a Proxy it will take these steps: 1. Send a CONNECT host:443 HTTP/1.1 2. The proxy will connect to the remote (real) https server and if everything is right, send an OK to the client, 3. If the Proxy sends a 200 (Ok) continue through TLS and send the real request (GET /directory HTTP/1.0 and Host: test.testdomain.com) My problem here is when working on the Request to check if the method is CONNECT (Request.process), when I do the startTLS (and make the transport SSL aware) I cannot find a way to read the next lines with the REAL request (the GET /directory HTTP/1.0). As I see how to write into the Request.process (self.transport.write) I don't see any way to read after the startTLS. I've tried with the self.content.seek(0,0) and self.content.read() but always getting "None". Is there a way to read the next lines from the client after the startTLS inside Request.process? I've reading about everything related to Proxy, CONNECT and mitm for a week but cannot find anything working for me... Thanks a lot in advance for your help and your patience :)

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 12 Aug '12

12 Aug '12

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[Twisted-Python] IUnicodeUsernamePassword?
by Laurens Van Houtven 09 Aug '12

09 Aug '12

Hi, Adding t.conch's ssh manhole (any third party IUsernamePassword provider would've done, really) to my app recently uncovered some unicode handling issues and I'm wondering what the appropriate way to resolve them is. In my API (AMP) there is a: - e-mail which is unicode - password which is unicode In my store (Axiom), there is a: - uid (unique user identifier, think UUID) which is bytes - e-mail which is unicode - password which is bytes, because it's the output of scrypt. scrypt also takes bytes as input: the password is first utf-8 encoded. Previously I was mistakenly handing around IUsernamePasswords where the e-mail address was unicode. Obviously the ICredentialsChecker implementation should take IUsernamePasswords that actually satisfy their contract and don't just pretend to, so ALL credentials it receives should have str/str, no exceptions. So, right now my credentials checker decodes the provided username to unicode in order to find the user by e-mail address (since, as mentioned above, Axiom thinks my e-mail addresses are unicode). The flip side of this is that the login method now first encodes the provided username and password as unicode. This is at least a semantically correct solution, but has the somewhat surprising property that in the 99.9% use case, the e-mail is received as unicode, immediately encoded, and then virtually straight after decoded again. That doesn't mean it's wrong, but it's a little weird. Potential solutions: 1. Make e-mail addresses bytes always. I don't know if this is semantically valid. 2. Add an IUnicodeUsernamePassword interface and implementation, and leaving adaptation to handle decoding/encoding. The downside here is that IIUC cred does not try to adapt to the ICredentialsChecker's supported interfaces, something I believe I complained about a few years back. cheers lvh

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[Twisted-Python] twisted server config: command line, environment or Axiom?
by Laurens Van Houtven 08 Aug '12

08 Aug '12

Hi, I have a bunch of configuration for my service. Things like endpoints, location of the root axiom store… Right now I grab these from the environment. That means that my twistd IServiceMaker plugin's options is pretty much by definition empty. I'm wondering if more mature twistd users have already learned the hard way what the best way to manage this is. I see three possible solutions: 1. environment variables as I use them now: portable, simple. 2. command line options: still pretty portable and simple. additional benefit: easy discoverability of options 3. axiom store: has the benefit that there's a single source of truth for everything, i.e. I copy a store and I can recreate the service based on that store exactly, using just the store Like I said, I currently use (1), it looks like (1) and (2) are more or less equivalent, I'm not sure if (3) is a good idea. I'm not really unhappy with (1), it's just that finally writing my ServiceMaker class made me contemplate the options. (3) has the downside that it conflates user data with configuration data. I'm not sure that's a good thing or not. It sounds very similar to axiomatic, which I've heard of, seen, but never played with. I already use environment variables to decide whether or not to run certain tests ("live" functional high level tests, with real disk and network IO, that take way longer than the unit tests to run). I'm going to keep it that way, because there's no obvious way of passing configuration to the tests other than the environment. cheers lvh

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[Twisted-Python] Using ProxyClient
by DF-- 07 Aug '12

07 Aug '12

Hi Guys! I'm new to the twisted framework and I'm using it to write a simple HTTPProxy with rewrite capabilities. While calling ProxyCiient.handleHeader method, it seems that Content-Length field is being added. Notice that I say "add" instead of "set": def handleHeader(self, key, value): *if key.lower() in ['server', 'date', 'content-type']:* self.father.responseHeaders.setRawHeaders(key, [value]) else: *self.father.responseHeaders.addRawHeader(key, value)* Look at this headers that I get if I use handleHeader method: HTTP/1.1 200 OK *Content-Length: 3025 Content-Length: 53* Host: localhost:8001 Accept: */* Server: Coco el servidor Connection: close Date: Tue, 07 Aug 2012 20:35:13 GMT User-Agent: curl/7.19.7 (i486-pc-linux-gnu) libcurl/7.19.7 OpenSSL/0.9.8k zlib/1.2.3.3 libidn/1.15 Content-Type: text/html So question is, am I using it properly? I'm adjusting the content length field as the data changed. Thanks in advanced, Daniel "En economía no hay nada misterioso ni inaccesible al entendimiento del hombre de la calle. Si hay un misterio, reside él en el oculto propósito que puede perseguir el economista y que no es otro que la disimulación del interés concreto a que se sirve." A. Jauretche

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[Twisted-Python] simple example for twisted ssh server with public key authentification
by Gelonida N 07 Aug '12

07 Aug '12

Hi, I just wanted to be sure, whether anybody has a small example snippet of a twisted ssh server with public key authentification.

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[Twisted-Python] San Francisco Twisted Sprint, Sunday August 19th
by Ying Li 06 Aug '12

06 Aug '12

Hello all! There will be a Twisted Sprint on Sunday, August 19th, in San Francisco at 620 Folsom St, Suite 100, in San Francisco, CA. There will be foods and coffee! -Ying

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[Twisted-Python] AMPBox as an Argument?
by Laurens Van Houtven 06 Aug '12

06 Aug '12

Hi, Apparently AMPBoxes aren't Arguments. However, I kind of want an AMPBox (like an AMPList, but only one). Use case: my responses have a "location", but a location is composed of several sub-things: place name, country and postal code. {"location": {"placeName": "Krakow", "countryCode": "PL", postalCode: "30-015"}} would be a lot nicer than having those keys in the top level namespace :) cheers lvh

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 05 Aug '12

05 Aug '12

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