how to urldecode a request_uri string in Lua
25,400
Solution 1
The decoded URI can be found in ngx.var.uri
. It does not contain the query string, if you need it see ngx.var.query_string
.
EDIT: if you cannot use this, here is a simple way to unescape a URL in Lua.
local hex_to_char = function(x)
return string.char(tonumber(x, 16))
end
local unescape = function(url)
return url:gsub("%%(%x%x)", hex_to_char)
end
Example usage:
local url = "/test/some%20string?foo=bar"
print(unescape(url)) -- /test/some string?foo=bar
But you should probably split the query string before using it.
Solution 2
If you are using nginx-lua-module then you can use below api for this.
newstr = ngx.unescape_uri(str)
You can also take a look of ngxescape_uri
Solution 3
Try ngx.req
api from nginx-lua-module
-
ngx.req.set_uri
: rewrite uri, rewrite path only, usengx.req.set_uri_args
if u also want replace params -
ngx.escape_uri
: for encode string -
ngx.unescape_uri
: for decode string
For Example: decode path & args
location / {
.....
rewrite_by_lua_block {
# Get nginx var $uri , ucant change to $request_uri ,$args ...
local uri = ngx.var.uri
# use api below to decode args
ngx.req.set_uri_args(ngx.unescape_uri(ngx.var.args));
# use set_uri to decode path
ngx.req.set_uri(ngx.unescape_uri(uri));
}
}
proxy_pass ....;
Ref. Document : https://github.com/openresty/lua-nginx-module#ngxreqset_uri
Author by
iRyanBell
Updated on August 04, 2021Comments
-
iRyanBell almost 3 years
When I use
ngx.var.request_uri
I'm getting back a string that contains %20 in place of spaces. Is there a urldecode() function or similar to decode my string? -
iRyanBell over 10 yearsWhen I visit /abc and my config bounces me through a 404 using
error_page 404 /test
, when I accessngx.var.uri
it's equal to /test rather than /abc. However,ngx.var.request_uri
evaluates to /abc -
catwell over 10 yearsOK, I have edited my answer to give you another option that actually unescapes the URL in Lua.
-
Sridhar Sarnobat over 4 yearsI wish there was a way to do this inline.