X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/9f401d6617a11efcedda1c956b2ccea061a7540f..14947b41085cd2d83043620df96e0c689183799c:/doc/plugins/contrib/field/discussion.mdwn diff --git a/doc/plugins/contrib/field/discussion.mdwn b/doc/plugins/contrib/field/discussion.mdwn index 103e061e5..6161f80df 100644 --- a/doc/plugins/contrib/field/discussion.mdwn +++ b/doc/plugins/contrib/field/discussion.mdwn @@ -324,3 +324,84 @@ smcv's discuission of field author vs meta author above. --[[Joey]] >>> the side-effects, but use `field` as an interface to get the values of those special fields. >>> --[[KathrynAndersen]] + +----- + +I think the main point is: what is (or should be) the main point of the +field plugin? If it's essentially a way to present a consistent +interface to access page-related structured information, then it makes +sense to have it very general. Plugins registering with fields would +then present ways for recovering the structure information from the page +(`ymlfront`, `meta`, etc), ways to manipulate it (like `meta` does), +etc. + +In this sense, security should be entirely up to the plugins, although +the fields plugin could provide some auxiliary infrastructure (like +determining where the data comes from and raise or lower the security +level accoringly). + +Namespacing is important, and it should be considered at the field +plugin interface level. A plugin should be able to register as +responsible for the processing of all data belonging to a given +namespace, but plugins should be able to set data in any namespace. So +for example, `meta` register are `meta` fields processing, and whatever +method is used to set the data (`meta` directive, `ymlfront`, etc) it +gets a say on what to do with data in its namespace. + +What I'm thinking of is something you could call fieldsets. The nice +thing about them is that, aside from the ones defined by plugins (like +`meta`), it would be possible to define custom ones (with a generic, +default processor) in an appropriate file (like smileys and shortcuts) +with a syntax like: + + [[!fieldset book namespace=book + fields="author title isbn" + fieldtype="text text text"]] + +after which, you coude use + + [[!book author="A. U. Thor" + title="Fields of Iki"]] + +and the data would be available under the book namespace, and thus +as BOOK_AUTHOR, BOOK_TITLE etc in templates. + +Security, in this sense, would be up to the plugin responsible for the +namespace processing (the default handler would HTML-escape text fields +scrub, html fields, safeurl()ify url fields, etc.) + +> So, are you saying that getting a field value is sort of a two-stage process? Get the value from anywhere, and then call the "security processor" for that namespace to "secure" the value? I think "namespaces" are really orthogonal to this issue. What the issue seems to be is: + + * what form do we expect the raw field to be in? (text, URL, HTML) + * what form do we expect the "secured" output to be in? (raw HTML, scrubbed HTML, escaped HTML, URL) + +> Only if we know both these things will we know what sort of security processing needs to be done. + +>> Fieldsets are orthogonal to the security issue in the sense that you can use +>> them without worrying about the field security issue, but they happen to be +>> a rather clean way of answering those two questions, by allowing you to +>> attach preprocessing attributes to a field in a way that the user +>> (supposedly) cannot mingle with. + +> There is also a difference between field values that are used inside pagetemplate, and field values which are used as part of a page's content (e.g. with ftemplate). If you have a TITLE, you want it to be HTML-escaped if you're using it inside pagetemplate, but you don't want it to be HTML-escaped if you're using it inside a page's content. On the other hand, if you have, say, FEEDLINKS used inside pagetemplate, you don't wish it to be HTML-escaped at all, or your page content will be completely stuffed. + +>> Not to talk about the many different ways date-like fields might be need +>> processing. It has already been proposed to solve this problem by exposing +>> the field values under different names depending on the kind or amout of +>> postprocessing they had (e.g. RAW_SOMEFIELD, SOMEFIELD, to which we could add +>> HTML_SOMEFIELD, URL_SOMEFIELD or whatever). Again, fieldsets offer a simple way +>> of letting Ikiwiki know what kind of postprocessing should be offered for +>> that particular field. + +> So, somehow, we have to know the meaning of a field before we can use it properly, which kind of goes against the idea of having something generic. + +>> We could have a default field type (text, for example), and a way to set a +>> different field type (which is what my fieldset proposal was about). + +> --[[KathrynAndersen]] + +----- + +I was just looking at HTML5 and wondered if the field plugin should generate the new Microdata tags (as well as the internal structures)? -- [[Will]] + +> This could just as easily be done as a separate plugin. Feel free to do so. --[[KathrynAndersen]]