内联 lua 改成文件

lua/http-dec-req-hdr.lua

@@ -0,0 +1,34 @@
+-- 功能：还原 HTTP 请求头
+-- 阶段：access_by_lua
+
+local hdrs, err = ngx.req.get_headers()
+local extHdrs
+
+for k, v in pairs(hdrs) do
+  if k:sub(1, 2) ~= '--' then
+    goto continue
+  end
+
+  ngx.req.clear_header(k)
+  k = k:sub(3)
+
+  if k == 'url' then
+    ngx.var._url = v
+  elseif k == 'ver' then
+    ngx.var._ver = v
+  elseif k == 'aceh' then
+    ngx.ctx._aceh = 1
+  elseif k == 'ext' then
+    extHdrs = require('cjson').decode(v)
+  else
+    ngx.req.set_header(k, v)
+  end
+
+  ::continue::
+end
+
+if extHdrs then
+  for k, v in pairs(extHdrs) do
+    ngx.req.set_header(k, v)
+  end
+end

lua/http-enc-res-hdr.lua

@@ -0,0 +1,74 @@
+-- 功能：编码 HTTP 返回头
+-- 阶段：header_filter_by_lua
+-- 备注：
+-- aceh = HTTP 返回头的 access-control-expose-headers 字段
+
+
+-- 无论浏览器是否支持，aceh 始终包含 *
+local expose = '*'
+
+-- 该值为 true 表示浏览器不支持 aceh: *，需返回详细的头部列表
+local detail = (ngx.ctx._aceh == 1)
+
+-- 由于接口路径固定，为避免被缓存，以请求头的 --url 值区分缓存
+local vary = '--url'
+
+local h, err = ngx.resp.get_headers()
+for k, v in pairs(h) do
+  if
+    -- 这些头有特殊意义，需要转义 --
+    k == 'access-control-allow-origin' or
+    k == 'access-control-expose-headers' or
+    k == 'location' or
+    k == 'set-cookie'
+  then
+    if type(v) == 'table' then
+      for i = 1, #v do
+        local x = i .. '-' .. k
+        ngx.header[x] = v[i]
+
+        if detail then
+          expose = expose .. ',' .. x
+        end
+      end
+    else
+      local x = '--' .. k
+      ngx.header[x] = v
+
+      if detail then
+        expose = expose .. ',' .. x
+      end
+    end
+    ngx.header[k] = nil
+
+  elseif k == 'vary' then
+    if type(v) == 'table' then
+      vary = vary .. ',' .. table.concat(v, ',')
+    else
+      vary = vary .. ',' .. v
+    end
+
+  elseif detail and
+    -- 非简单头无法被 fetch 读取，需添加到 aceh 列表 --
+    -- https://developer.mozilla.org/en-US/docs/Glossary/Simple_response_header
+    k ~= 'cache-control' and
+    k ~= 'content-language' and
+    k ~= 'content-type' and
+    k ~= 'expires' and
+    k ~= 'last-modified' and
+    k ~= 'pragma'
+  then
+    expose = expose .. ',' .. k
+  end
+end
+
+if detail then
+  expose = expose .. ',--s'
+  ngx.header['--t'] = '1'
+end
+
+ngx.header['access-control-expose-headers'] = expose
+ngx.header['access-control-allow-origin'] = '*'
+ngx.header['vary'] = vary
+ngx.header['--s'] = ngx.status
+ngx.status = 200

lua/ws-dec-req-hdr.lua

@@ -0,0 +1,15 @@
+-- 功能：还原 WebSocket 的 HTTP 请求头
+-- 阶段：access_by_lua
+-- 备注：JS 无法设置 ws 的头部，因此信息存储于 query
+
+local query, err = ngx.req.get_uri_args()
+
+for k, v in pairs(query) do
+  if k == 'url__' then
+    ngx.var._url = v
+  elseif k == 'ver__' then
+    ngx.var._ver = v
+  else
+    ngx.req.set_header(k, v)
+  end
+end