chore: import upstream snapshot with attribution

spec/fixtures/custom_plugins/kong/plugins/error-handler-log/handler.lua

@@ -0,0 +1,52 @@
+local cjson = require("cjson")
+local ngx = ngx
+
+
+local ErrorHandlerLog = {}
+
+
+ErrorHandlerLog.PRIORITY = 1000
+ErrorHandlerLog.VERSION = "1.0"
+
+local function register(phase)
+  local ws_id = ngx.ctx.workspace or kong.default_workspace
+  local phases = ngx.ctx.err_handler_log_phases or {}
+  local in_ws = phases[ws_id] or {}
+  phases[ws_id] = in_ws
+  table.insert(in_ws, phase)
+  ngx.ctx.err_handler_log_phases = phases
+end
+
+
+function ErrorHandlerLog:rewrite(conf)
+  register("rewrite")
+end
+
+
+function ErrorHandlerLog:access(conf)
+  register("access")
+end
+
+
+function ErrorHandlerLog:header_filter(conf)
+  register("header_filter")
+
+  local phases = ngx.ctx.err_handler_log_phases or {}
+
+
+  ngx.header["Content-Length"] = nil
+  ngx.header["Log-Plugin-Phases"] = table.concat(phases[ngx.ctx.workspace] or {}, ",")
+  ngx.header["Log-Plugin-Workspaces"] = cjson.encode(phases)
+
+  ngx.header["Log-Plugin-Service-Matched"] = ngx.ctx.service and ngx.ctx.service.name
+end
+
+
+function ErrorHandlerLog:body_filter(conf)
+  if not ngx.arg[2] then
+    ngx.arg[1] = "body_filter"
+  end
+end
+
+
+return ErrorHandlerLog