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https://issues.apache.org/jira/browse/COUCHDB-431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186932#comment-13186932
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Jason Smith commented on COUCHDB-431:
-------------------------------------
I have a partial implementation of Benoit's updated spec at
http://friendpaste.com/4q1zeNUEtPFS7XbioPYYzM
https://github.com/jhs/couchdb/commits/newcors/
This includes two etap files, with 44 tests so far. There is no HTTP code yet.
I plan to use Benoit's http code and tests from his patches on this ticket,
which have been reviewed by several people. For now I am focusing on getting
good tests about CORS policy.
My code so-far is a new module, couch_cors_policy.erl. It has almost no
connection or dependency with Couch. It does not require initialization. It is
not necessary to start any couch_* servers. Its primary function is check/3
Given parameters (1) a global configuration, i.e. couch_config stuff, (2) a
local configuration (a _security object), and an #httpd{} request, it will
return a list of the correct CORS headers, or 'false' if the response should
not support CORS.
When couch_config is running, you can omit the first parameter, and it will
derive it from the config. See test/etap/251-cors-config.t.
In any case, test/etap/250-cors-policy.t exercises the policy decisions and
whether they are correct. It is in-progress, but the tests cover a few aspects:
* The interaction between _security and the _config (in general, _security
takes precedence)
* Correct headers according to the spec
* Defaults, and their interaction with user settings
Feedback is appreciated. Thanks.
> Support cross domain XMLHttpRequest (XHR) calls by implementing Access
> Control spec
> -----------------------------------------------------------------------------------
>
> Key: COUCHDB-431
> URL: https://issues.apache.org/jira/browse/COUCHDB-431
> Project: CouchDB
> Issue Type: New Feature
> Components: HTTP Interface
> Affects Versions: 0.9
> Reporter: James Burke
> Assignee: Benoit Chesneau
> Priority: Minor
> Fix For: 1.3
>
> Attachments: 0001-cors-support.-should-fix-COUCHDB-431-2.patch,
> 0001-cors-support.-should-fix-COUCHDB-431.patch,
> 0001-cors-support.-should-fix-COUCHDB-431.patch,
> 0001-cors-support.-should-fix-COUCHDB-431.patch,
> 0001-cors-support.-should-fix-COUCHDB-431.patch,
> A_0001-Generalize-computing-the-appropriate-headers-for-any.patch,
> A_0002-Send-server-headers-for-externals-responses.patch,
> A_0003-Usably-correct-w3c-CORS-headers-for-valid-requests.patch,
> A_0004-Respond-to-CORS-preflight-checks-HTTP-OPTIONS.patch, cors.html,
> cors_test.html, test_cors2-1.tgz, test_cors2.tgz
>
>
> Historically, browsers have been restricted to making XMLHttpRequests (XHRs)
> to the same origin (domain) as the web page making the request. However, the
> latest browsers now support cross-domain requests by implementing the Access
> Control spec from the W3C:
> http://dev.w3.org/2006/waf/access-control/
> In order to keep older servers safe that assume browsers only do same-domain
> requests, the Access Control spec requires the server to opt-in to allow
> cross domain requests by the use of special HTTP headers and supporting some
> "pre-flight" HTTP calls.
> Why should CouchDB support this: in larger, high traffic site, it is common
> to serve the static UI files from a separate, differently scaled server
> complex than the data access/API server layer. Also, there are some API
> services that are meant to be centrally hosted, but allow API consumers to
> use the API from different domains. In these cases, the UI in the browser
> would need to do cross domain requests to access CouchDB servers that act as
> the API/data access server layer.
> JSONP is not enough in these cases since it is limited to GET requests, so no
> POSTing or PUTing of documents.
> Some information from Firefox's perspective (functionality available as of
> Firefox 3.5):
> https://developer.mozilla.org/en/HTTP_access_control
> And information on Safari/Webkit (functionality in latest WebKit and Safari
> 4):
> http://developer.apple.com/safari/library/documentation/AppleApplications/Conceptual/SafariJSProgTopics/Articles/XHR.html
> IE 8 also uses the Access Control spec, but the requests have to go through
> their XDomainRequest object (XDR):
> http://msdn.microsoft.com/en-us/library/cc288060%28VS.85%29.aspx
> and I thought IE8 only allowed GET or POST requests through their XDR.
> But as far as CouchDB is concerned, implementing the Access Control headers
> should be enough, and hopefully IE 9 will allow normal xdomain requests via
> XHR.
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