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Re: Should I send patch here? - xslt_enable "only enable xslt transform for certain user agent"

tOmasEn
January 27, 2010 11:26AM
Thanks a lot for reply. I will try make the adjustments accordingly.

> Any reason to use value here? Looks like cut-n-paste leftover
> from gzip_disable.

Yes, I did copy those from gzip_disable. be frankly, I'm still not very
clear on the correct ways to use ngx_buf , ngx_string , ngx_regex . Also
not sure where to look except code sample from other module :| .

For example. I'm thinking to detect if the xml do fit for xslt transform
before put it though, which mean the xml should have line like
<?xml-stylesheet type="text/xsl" href="xxxxx"/> . I guess I should put it at
beginning of ngx_http_xslt_body_filter. and check if I can find
"xml-stylesheet" in (ngx_chain_t *)in->buf. But not sure what's the correct
way to handle ngx_buf .

I'll subscribe nginx-devel now.


On Wed, Jan 27, 2010 at 8:49 PM, Maxim Dounin <mdounin@mdounin.ru> wrote:

> Hello!
>
> Just a note: it's probably better idea to post patches to
> nginx-devel@. Cc'd.
>
> On Wed, Jan 27, 2010 at 06:04:16PM +0800, tOmasEn wrote:
>
> > Maybe not many people using xslt as main web layout. but I do.
> >
> > This patch is similar to gzip_disable. xslt_enable only enable xslt
> > transform for certain user agent.
> >
> > e.g.
> > xslt_enable "Googlebot"
> > will only enable xslt transform output for google's crawler.
>
> While I tend to think this is good feature (though not sure), I
> also think that it probably needs some better name. Something
> more self-explaining.
>
> Also it's probably better to make xslt controllable via variable
> instead. This will handle you "disable via special header" case
> as well.
>
> > And, I'm also planing some other improve on xslt module. Like: when xslt
> > transform failed, output original xml file instead of 500 server error;
> Skip
> > xslt transform if client send specified HTTP header like "No-XSLT", etc.
> > Should I talk to somebody and discuss the architect?
> >
> > --
> > Tomasen
> > http://twitter.com/ShooterPlayer
> > http://t.sina.com.cn/Tomasen
>
> > *** ../nginx-0.8.31/src/http/modules/ngx_http_xslt_filter_module.c
> 2010-01-27 17:23:37.000000000 +0800
> > --- nginx-0.8.31/src/http/modules/ngx_http_xslt_filter_module.c
> 2009-11-30 21:15:10.000000000 +0800
> > ***************
> > *** 48,54 ****
>
> Please use unified diff patches, and not reversed ones.
>
> > ngx_array_t sheets; /* ngx_http_xslt_sheet_t */
> > ngx_hash_t types;
> > ngx_array_t *types_keys;
> > - ngx_array_t *xslt_enable; /* xslt_enable */
>
> Comment is pointless and wrongly placed. Just remove it.
>
> > } ngx_http_xslt_filter_loc_conf_t;
> >
> >
> > --- 48,53 ----
> > ***************
> > *** 135,143 ****
> > void *child);
> > static ngx_int_t ngx_http_xslt_filter_init(ngx_conf_t *cf);
> > static void ngx_http_xslt_filter_exit(ngx_cycle_t *cycle);
> > !
> > ! static char *ngx_http_xslt_enable(ngx_conf_t *cf, ngx_command_t *cmd,
> > ! void
> *conf);
>
> 1. Please follow nginx style.
>
> 2. Please move this to other config parsing functions.
>
> >
> > ngx_str_t ngx_http_xslt_default_types[] = {
> > ngx_string("text/xml"),
> > --- 134,140 ----
> > void *child);
> > static ngx_int_t ngx_http_xslt_filter_init(ngx_conf_t *cf);
> > static void ngx_http_xslt_filter_exit(ngx_cycle_t *cycle);
> > !
> >
> > ngx_str_t ngx_http_xslt_default_types[] = {
> > ngx_string("text/xml"),
> > ***************
> > *** 168,183 ****
> > offsetof(ngx_http_xslt_filter_loc_conf_t, types_keys),
> > &ngx_http_xslt_default_types[0] },
> >
> > ! { ngx_string("xslt_enable"),
> > !
> NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
> > ! ngx_http_xslt_enable,
> > ! NGX_HTTP_LOC_CONF_OFFSET,
> > ! offsetof(ngx_http_xslt_filter_loc_conf_t, xslt_enable),
> > ! NULL },
> > !
> > ! ngx_null_command
> > };
> >
> > static ngx_http_module_t ngx_http_xslt_filter_module_ctx = {
> > NULL, /* preconfiguration */
> > ngx_http_xslt_filter_init, /* postconfiguration */
> > --- 165,174 ----
> > offsetof(ngx_http_xslt_filter_loc_conf_t, types_keys),
> > &ngx_http_xslt_default_types[0] },
> >
> > ! ngx_null_command
> > };
> >
> > +
>
> Unrelated (and wrong) whitespace change here.
>
> > static ngx_http_module_t ngx_http_xslt_filter_module_ctx = {
> > NULL, /* preconfiguration */
> > ngx_http_xslt_filter_init, /* postconfiguration */
> > ***************
> > *** 212,289 ****
> > static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
> > static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
> >
> > -
> > - static char *
> > - ngx_http_xslt_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
> > - {
>
> Please move config parsing function to other config parsing
> functions.
>
> > - ngx_http_xslt_filter_loc_conf_t *clcf = conf;
> > -
> > - #if (NGX_PCRE)
> > - ngx_str_t *value;
> > - ngx_uint_t i;
> > - ngx_regex_elt_t *re;
> > - ngx_regex_compile_t rc;
> > - u_char errstr[NGX_MAX_CONF_ERRSTR];
> > -
> > - if (clcf->xslt_enable == NULL) {
> > - clcf->xslt_enable = ngx_array_create(cf->pool, 2,
> > - sizeof(ngx_regex_elt_t));
> > - if (clcf->xslt_enable == NULL) {
> > - return NGX_CONF_ERROR;
> > - }
>
> No tabs, please.
>
> > - }else{
> > - //xslt_enable_is_not_required
> > - return NGX_CONF_OK;
>
> 1. No C++ comments, please.
>
> 2. You should either return error here (something like return "is
> duplicate") or append to list as gzip_disable do. Blindly
> ignoring configuration directive isn't what nginx generally do.
>
> > - }
> > -
> > - value = cf->args->elts;
> > -
> > - ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
> > -
> > - rc.pool = cf->pool;
> > - rc.err.len = NGX_MAX_CONF_ERRSTR;
> > - rc.err.data = errstr;
> > -
> > - for (i = 1; i < cf->args->nelts; i++) {
> > -
> > - re = ngx_array_push(clcf->xslt_enable);
> > - if (re == NULL) {
> > - return NGX_CONF_ERROR;
> > - }
> > -
> > - rc.pattern = value[1];
> > - rc.options = NGX_REGEX_CASELESS;
> > -
> > - if (ngx_regex_compile(&rc) != NGX_OK) {
> > - ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V",
> &rc.err);
> > - return NGX_CONF_ERROR;
> > - }
> > -
> > - re->regex = rc.regex;
> > - re->name = value[i].data;
> > -
> > - }
> > -
> > - return NGX_CONF_OK;
> > -
> > - #else
> > - ngx_str_t *value;
> > -
> > - value = cf->args->elts;
>
> Any reason to use value here? Looks like cut-n-paste leftover
> from gzip_disable.
>
> > -
> > - ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
> > - "without PCRE library \"xslt_enable\" won't work ");
> > -
> > - return NGX_CONF_ERROR;
> > - #endif
> > - }
> >
> > static ngx_int_t
> > ngx_http_xslt_header_filter(ngx_http_request_t *r)
> > {
> > ngx_http_xslt_filter_ctx_t *ctx;
> > ngx_http_xslt_filter_loc_conf_t *conf;
> > !
> > ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
> > "xslt filter header");
> >
> > --- 203,215 ----
> > static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
> > static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
> >
> >
> > static ngx_int_t
> > ngx_http_xslt_header_filter(ngx_http_request_t *r)
> > {
> > ngx_http_xslt_filter_ctx_t *ctx;
> > ngx_http_xslt_filter_loc_conf_t *conf;
> > !
> > ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
> > "xslt filter header");
> >
> > ***************
> > *** 299,318 ****
> > return ngx_http_next_header_filter(r);
> > }
> >
> > - #if (NGX_PCRE)
> > -
> > - if (conf->xslt_enable && r->headers_in.user_agent) {
> > -
> > - if (ngx_regex_exec_array(conf->xslt_enable,
> > - &r->headers_in.user_agent->value,
> > - r->connection->log)
> > - == NGX_DECLINED)
> > - {
> > - return ngx_http_next_header_filter(r);
> > - }
> > - }
> > -
> > - #endif
> > ctx = ngx_http_get_module_ctx(r, ngx_http_xslt_filter_module);
> >
> > if (ctx) {
> > --- 225,230 ----
>
> Maxim Dounin
>
> _______________________________________________
> nginx mailing list
> nginx@nginx.org
> http://nginx.org/mailman/listinfo/nginx
>



--
Tomasen
http://twitter.com/ShooterPlayer
http://t.sina.com.cn/Tomasen
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Subject Author Views Posted

Re: Should I send patch here? - xslt_enable "only enable xslt transform for certain user agent"

Maxim Dounin 2473 January 27, 2010 07:50AM

Re: Should I send patch here? - xslt_enable "only enable xslt transform for certain user agent"

tOmasEn 1044 January 27, 2010 11:26AM

Re: Should I send patch here? - xslt_enable "only enable xslt transform for certain user agent" Attachments

tOmasEn 1352 January 27, 2010 12:14PM



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