增加sql的waf功能

tools.lua

@@ -0,0 +1,33 @@
+function i_get_cookie(s_cookie)
+    local cookie = {}
+
+    -- string.gfind is renamed to string.gmatch
+    for item in string.gmatch(s_cookie, "[^;]+") do
+        local _, _, k, v = string.find(item, "^%s*(%S+)%s*=%s*(%S+)%s*")
+        if k ~= nil and v ~= nil then
+            cookie[k] = v
+        end
+    end
+
+    return cookie
+end
+
+function get_cookie_table()
+    local raw_cookie = ngx.req.get_headers()["Cookie"]
+    if raw_cookie ~= nil then
+        return i_get_cookie(raw_cookie)
+    end
+    return nil
+end
+
+function get_cookie_raw()
+    return ngx.req.get_headers()["Cookie"]
+end
+
+function match_string(input_str, rule)
+    if input_str == nil then
+        return false
+    end
+    local from, to, err = ngx.re.find(input_str, rule, "jo")
+    return from ~= nil
+end