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Allow $dollar (or ${dollar}) to translate to a literal $ to allow
support for sub-delimiters in URIs.
It is possible to have URLs like
https://example.com/path/15$1588/9925$2976.html
and thus it would be useful to be able to specify them in various bits
of the unit config such as the location setting.
However this hadn't been possible due to $ being used to denote
variables for substitution. E.g $host.
As was noted in the below GitHub issue it was suggested by @VBart to
use $sign to represent a literal $, however I feel $dollar is more
appropriate so we have a variable named after the thing it represents,
also @tippexs found[0] that &dollar is used in HTML to represent a $, so
there is some somewhat related precedent.
(The other idea to use $$ was rejected in my original pull-request[1]
for this issue.)
This means the above URL could be specified as
https://example.com/path/15${dollar}1588/9925${dollar}2976.html
in the unit config.
This is done by adding a variable called 'dollar' which is loaded into
the variables hash table which translates into a literal $.
This is then handled in nxt_var_next_part() where variables are parsed
for lookup and $dollar is set for substitution by a literal '$'. Actual
variable substitution happens in nxt_var_query_finish().
[0]: https://github.com/nginx/unit/pull/693#issuecomment-1130412323
[1]: https://github.com/nginx/unit/pull/693
Closes: https://github.com/nginx/unit/issues/675
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This commit adds the following variables:
$remote_addr, $time_local, $request_line, $status,
$body_bytes_sent, $header_referer, $header_user_agent.
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This commit adds the variables $arg_NAME, $header_NAME, and $cookie_NAME.
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No functional changes.
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This supports a new variable $request_uri that contains the path
and the query (See RFC 3986, section 3). Its contents are percent
encoded. This is useful for example to redirect HTTP to HTTPS:
{
"return": "301",
"location": "https://$host$request_uri"
}
When <http://example.com/foo%23bar?baz> is requested, the server
redirects to <https://example.com/foo%23bar?baz>.
===
Testing:
//diff --git a/src/nxt_http_return.c b/src/nxt_http_return.c
//index 82c9156..adeb3a1 100644
//--- a/src/nxt_http_return.c
//+++ b/src/nxt_http_return.c
//@@ -196,6 +196,7 @@ nxt_http_return_send_ready(nxt_task_t *task,
void *obj, void *data)
// field->value = ctx->encoded.start;
// field->value_length = ctx->encoded.length;
// }
//+ fprintf(stderr, "ALX: target[%1$i]: <%2$.*1$s>\n",
(int)r->target.length, r->target.start);
//
// r->state = &nxt_http_return_send_state;
//
{
"listeners": {
"*:81": {
"pass": "routes/ru"
}
},
"routes": {
"ru": [{
"action": {
"return": 301,
"location": "$request_uri"
}
}]
}
}
$ curl -i http://localhost:81/*foo%2Abar?baz#arg
HTTP/1.1 301 Moved Permanently
Location: /*foo%2Abar?baz
Server: Unit/1.27.0
Date: Mon, 30 May 2022 16:04:30 GMT
Content-Length: 0
$ sudo cat /usr/local/unit.log | grep ALX
ALX: target[15]: </*foo%2Abar?baz>
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This closes #407 issue on GitHub.
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