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Detect preferred language script for Nginx written in LUA
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| ------------------------------------------------------------------------------- | |
| -- HTTP Accept-Language header handler -- | |
| -- @originalAuthor: f.ghibellini@gmail.com -- | |
| -- @originalRepository: https://github.com/fghibellini/nginx-http-accept-lang-- | |
| -- @modifiedBy: marian.hello@mapilary.com -- | |
| -- @gist: https://gist.github.com/mauron85/47ed1075262d9e020fe2 -- | |
| -- @license: MIT -- | |
| -- @requires: -- | |
| -- @description: -- | |
| -- returns language with greatest quality -- | |
| -- value according to RFC:2616 -- | |
| -- @example configuration: -- | |
| -- -- | |
| -- server { -- | |
| -- listen 8080 default_server; -- | |
| -- index index.html index.htm; -- | |
| -- server_name localhost; -- | |
| -- -- | |
| -- root usr/share/nginx/html; -- | |
| -- -- | |
| -- location = / { -- | |
| -- # $lang_sup holds comma separated languages supported by site -- | |
| -- # if no match first will be used (en) in this case -- | |
| -- set $lang_sup = "en,sk" -- | |
| -- set_by_lua_file $lang_accept /etc/nginx/lang.lua $lang_sup; -- | |
| -- rewrite (.*) $scheme://$server_name/$lang_accept$1; -- | |
| -- } -- | |
| -- } -- | |
| -- -- | |
| ------------------------------------------------------------------------------- | |
| function inTable(tbl, item) | |
| for key, value in pairs(tbl) do | |
| if value == item then return key end | |
| end | |
| return false | |
| end | |
| function string:split( inSplitPattern, outResults ) | |
| if not outResults then | |
| outResults = { } | |
| end | |
| local theStart = 1 | |
| local theSplitStart, theSplitEnd = string.find( self, inSplitPattern, theStart ) | |
| while theSplitStart do | |
| table.insert( outResults, string.sub( self, theStart, theSplitStart-1 ) ) | |
| theStart = theSplitEnd + 1 | |
| theSplitStart, theSplitEnd = string.find( self, inSplitPattern, theStart ) | |
| end | |
| table.insert( outResults, string.sub( self, theStart ) ) | |
| return outResults | |
| end | |
| local lang_sup = {"en"} | |
| if ( ngx.arg[1] ~= nil ) then | |
| lang_sup = ngx.arg[1]:split(",") | |
| end | |
| local lang_header = ngx.var.http_accept_language | |
| if ( lang_header == nil ) then | |
| return lang_sup[1] | |
| end | |
| local cleaned = ngx.re.sub(lang_header, "^.*:", "") | |
| local options = {} | |
| local iterator, err = ngx.re.gmatch(cleaned, "\\s*([a-z]+(?:-[a-z])*)\\s*(?:;q=([0-9]+(.[0-9]*)?))?\\s*(,|$)", "i") | |
| for m, err in iterator do | |
| local lang = m[1] | |
| local priority = 1 | |
| if m[2] ~= nil then | |
| priority = tonumber(m[2]) | |
| if priority == nil then | |
| priority = 1 | |
| end | |
| end | |
| table.insert(options, {lang, priority}) | |
| end | |
| table.sort(options, function(a,b) return b[2] < a[2] end) | |
| for index, lang in pairs(options) do | |
| if inTable(lang_sup, lang[1]) then | |
| return lang[1] | |
| end | |
| end | |
| return lang_sup[1] |
To avoid this warning:
2019/10/30 15:48:02 [warn] 22#22: *11 [lua] _G write guard:12: __newindex(): writing a global lua variable ('inTable') which may lead to race conditions between concurrent requests, so prefer the use of 'local' variables
inTable should be declared local.
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In the example above the NGINX configuration doesn't work for 1.8.x version
It should be like that (note the different set)