ESP32 Forum

Posted: **Tue Jul 06, 2021 7:49 am**

ESP32做 web服务器使用，使用配置条件：

config.uri_match_fn = httpd_uri_match_wildcard;

默认可以匹配以xxx开始的部分，匹配如下：

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 * Example:
 *   - * matches everything
 *   - /foo/? matches /foo and /foo/
 *   - /foo/\* (sans the backslash) matches /foo/ and /foo/bar, but not /foo or /fo
 *   - /foo/?* or /foo/\*?  (sans the backslash) matches /foo/, /foo/bar, and also /foo, but not /foox or /fo
 *
 * The special characters "?" and "*" anywhere else in the template will be taken literally.

如果我要实现如下这种匹配结构，匹配函数该怎么写？

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 /*.html   
 /*.css

文档说，参考httpd_uri_match_func_t函数原型说明
原型如下：

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typedefbool (*httpd_uri_match_func_t)(const char *reference_uri, const char *uri_to_match, size_t match_upto)
Function prototype for URI matching.

Return
true on match

Parameters
[in] reference_uri: URI/template with respect to which the other URI is matched

[in] uri_to_match: URI/template being matched to the reference URI/template

[in] match_upto: For specifying the actual length of uri_to_match up to which the matching algorithm is to be applied (The maximum value is strlen(uri_to_match), independent of the length of reference_uri)

这三个参数的含义没看懂

Posted: **Wed Jul 07, 2021 3:24 am**

第一个参数 reference_uri 代表匹配的模板，可以不带通配符，第二个参数 uri_to_match 代表要匹配的 uri，第三个参数 match_upto 是第二个参数要匹配的长度，如果全匹配就传入 uri 的长度。

Code: [Select all] [Expand/Collapse]

bool esp_http_uri_match_wildcard(const char *template, const char *uri, size_t uri_len)
{
    const size_t tpl_len = strlen(template);
    int tpl_p = 0, uri_p = 0;
    int tpl_p_last = -1, uri_p_last = -1;
 
    while (uri_p < uri_len) {
        if (tpl_p < tpl_len && (*(uri + uri_p) == *(template + tpl_p))) {
            tpl_p ++;
            uri_p ++;
        }
        else if (tpl_p < tpl_len && (*(template + tpl_p) == '*')) {
            tpl_p_last = tpl_p;
            tpl_p ++;
            uri_p_last = uri_p;
        }
        else if (tpl_p_last > -1) {
            tpl_p = tpl_p_last + 1;
            uri_p_last ++;
            uri_p = uri_p_last;
        }
        else {
            return false;
        }
    }
    while (tpl_p < tpl_len && (*(template + tpl_p) == '*')) {
        tpl_p ++;
    }
    if (tpl_p == tpl_len) {
        return true;
    }
    return false;
}

你可以使用上面的函数来匹配你的规则。比如匹配 /*html，函数如下：

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esp_http_uri_match_wildcard("*.html", "/test.html", strlen("/test.html"))

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