多域名跨域处理

cross_domain.lua

local function set_cross_domain_name()
    local domain = "xxx.com" -- replace this
    local domain_reg = string.format(".*%s",domain)
    local schema = ngx.var.scheme -- get schema
    local server_name = ngx.var.server_name -- get request header server name
    local origin_name = ngx.req.get_headers()['Origin'] -- get request header Origin value
    local m_server,err = ngx.re.match(server_name,domain_reg,"iu") -- match domain value from request server name
    if origin_name then
        local m_origin,err = ngx.re.match(origin_name,domain_reg,"iu") -- match domain value from request Origin 
        if m_origin then
            return origin_name
        end 
    elseif m_server then
        local domain = string.format("%s://%s", schema,server_name)
        return domain
    end 
end

local http_method = ngx.req.get_method() -- get http request method
ngx.header["Access-Control-Allow-Origin"] = set_cross_domain_name() -- add cross domain headers
if http_method == "OPTIONS" then -- method is OPTIONS
    return ngx.exit(ngx.HTTP_OK) -- set http status code
end

nginx.conf

server {
    server_name abc.xxx.com;
    listen 80;
    access_by_lua_file cross_domain.lua; # set cross_domain file
    location / {
        proxy_pass http://xxx;
    }
}