Nginx 将查询字符串重写为路径参数

我有以下托管映像服务的nginx配置：

    upstream thumbor {
        server localhost:8888;
    }

    server {
        listen       80;
        server_name  my.imageserver.com;
        client_max_body_size 10M;
        rewrite_log on;
        location ~ /images { 
            if ($arg_width="10"){
                rewrite ^/images(/.*)$ /unsafe/$1 last;
            }
            rewrite ^/images(/.*)$ /unsafe/$1 last;
        }
        location ~ /unsafe {
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header HOST $http_host;
            proxy_set_header X-NginX-Proxy true;

            proxy_pass http://thumbor;
            proxy_redirect off;
        }

        location = /favicon.ico {
            return 204;
            access_log     off;
            log_not_found  off;
        }
    }

我正在尝试重写以下URL：

来自

至

这很容易，当我想允许查询字符串进入url路径时，问题就开始了，如下所示：

来自

至

如果查询字符串的顺序无关紧要，也会更好

我尝试使用： $arg_宽度，但似乎不起作用

在ubuntu上使用nginx 1.6.1

---

非常感谢您的帮助。

处理查询参数总是很困难的（Apache也是如此）

但在您的示例中，当您这样做时：

location ~ /images { 
    if ($arg_width="10"){
        rewrite ^/images(/.*)$ /unsafe/$1 last;
    }
    rewrite ^/images(/.*)$ /unsafe/$1 last;
}

我看不出两次重写之间有什么区别。。。所以这可能就是它不起作用的原因

无论如何，您可以尝试类似的方法（基于）：

---

您可以使用

arg_name

参数，并且可以去掉

location

块：

 rewrite ^/images/(.*)$ /unsafe/$1;
 # WARNING: Here we suppose that when we have a "mode" parameter, we have
 # width and height paremeters too
 if ($arg_mode) {
     rewrite ^/unsafe/(.*)$ /images/unsafe/smart/$arg_mode/${arg_width}x${arg_height}/$1 last;
 }

---

您需要一个脚本选项来评估输入并构造重写URL。我使用第三方进行这种逻辑

在您的机器上安装或最好安装后，您需要将模块编译成Nginx

或者，您可以安装与几个模块捆绑在一起的Nginx，将Nginx完全转换为完整的web应用服务器。Openresty将在安装期间处理Lua/LuaJit依赖关系

如果您已经准备好了，这将为您完成以下工作：

upstream thumbor {
    server localhost:8888;
}
server {
    [...]
    location ~ ^/images { 
        rewrite_by_lua '
            -- Use local variables to limit their scope to this location block
            local i, j, key, val, args, dimension, modetype, tempheight, replacement

            -- We only go ahead if there are request arguments to start with
            if ngx.var.is_args then
                -- Get the request arguments
                -- These are loaded into a Lua table of the form, { a = 1, b = 2, c = 3 } 
                args = ngx.req.get_uri_args()
                -- Loop through the args table and build our replacement string
                for key, val in pairs(args) do
                    if key == "width" then
                        if tempheight then
                            dimension = val .. "x" .. tempheight
                        else
                            dimension = val 
                        end
                    elseif key == "height" then 
                        if dimension then
                            dimension = dimension .. "x" .. val
                        else
                            tempheight = val 
                        end
                    elseif key == "mode" then 
                        modetype = val 
                    end
                end

                -- Construct the replacement string. 
                replacement = "/unsafe/" .. dimension .. "/" .. modetype .. "/"

                -- Replace "/images/" in the request url with the replacement string. 
                local newuri, n, err = ngx.re.sub(ngx.unescape_uri(ngx.var.request_uri), "/images/", replacement, "io")

                -- If there is a new string, then redirect to the new URL
                if newuri then
                    return ngx.redirect(newuri, 301) 
                end
            end
        ';
    }
    location ~ /unsafe {
        [...]
        proxy_pass http://thumbor;
    }
    [...] 
}

---

请展示你现在拥有的东西。我怀疑你没有逃过这个问号，但很难看出你的错误在哪里…这就是我目前所做的，我尝试了几种方法，包括$arg_width、$arg_height，但都不起作用。它不起作用，因为nginx显然不支持嵌套if，但当取消嵌套并稍微更改逻辑时，它工作得很好！谢谢你的帮助！是的，忘记了这个嵌套if限制。为了便于参考，您应该在修正中添加注释，或者用工作解决方案编辑此答案（或您的问题）。也许可以给@Dayo一部分奖励，因为LUA脚本也是一种避免危险操作的好方法，它使用

if

——就像Nginx中的“if是邪恶的”。

upstream thumbor {
    server localhost:8888;
}
server {
    [...]
    location ~ ^/images { 
        rewrite_by_lua '
            -- Use local variables to limit their scope to this location block
            local i, j, key, val, args, dimension, modetype, tempheight, replacement

            -- We only go ahead if there are request arguments to start with
            if ngx.var.is_args then
                -- Get the request arguments
                -- These are loaded into a Lua table of the form, { a = 1, b = 2, c = 3 } 
                args = ngx.req.get_uri_args()
                -- Loop through the args table and build our replacement string
                for key, val in pairs(args) do
                    if key == "width" then
                        if tempheight then
                            dimension = val .. "x" .. tempheight
                        else
                            dimension = val 
                        end
                    elseif key == "height" then 
                        if dimension then
                            dimension = dimension .. "x" .. val
                        else
                            tempheight = val 
                        end
                    elseif key == "mode" then 
                        modetype = val 
                    end
                end

                -- Construct the replacement string. 
                replacement = "/unsafe/" .. dimension .. "/" .. modetype .. "/"

                -- Replace "/images/" in the request url with the replacement string. 
                local newuri, n, err = ngx.re.sub(ngx.unescape_uri(ngx.var.request_uri), "/images/", replacement, "io")

                -- If there is a new string, then redirect to the new URL
                if newuri then
                    return ngx.redirect(newuri, 301) 
                end
            end
        ';
    }
    location ~ /unsafe {
        [...]
        proxy_pass http://thumbor;
    }
    [...] 
}