[英]How to check whether a string is a valid HTTP URL?
有Uri.IsWellFormedUriString
和Uri.TryCreate
方法,但它們似乎對文件路徑等返回true
。
如何檢查字符串是否有效(不一定是活動的) HTTP URL 以進行輸入驗證?
嘗試此操作以驗證HTTP URL( uriName
是您要測試的URI):
Uri uriResult;
bool result = Uri.TryCreate(uriName, UriKind.Absolute, out uriResult)
&& uriResult.Scheme == Uri.UriSchemeHttp;
或者,如果您要同時接受HTTP和HTTPS URL(根據J0e3gan的評論):
Uri uriResult;
bool result = Uri.TryCreate(uriName, UriKind.Absolute, out uriResult)
&& (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps);
此方法在http和https中均可正常工作。 只需一行:)
if (Uri.IsWellFormedUriString("https://www.google.com", UriKind.Absolute))
MSDN: IsWellFormedUriString
public static bool CheckURLValid(this string source)
{
Uri uriResult;
return Uri.TryCreate(source, UriKind.Absolute, out uriResult) && uriResult.Scheme == Uri.UriSchemeHttp;
}
用法:
string url = "htts://adasd.xc.";
if(url.CheckUrlValid())
{
//valid process
}
更新:(單行代碼) 感謝@GoClimbColorado
public static bool CheckURLValid(this string source) => Uri.TryCreate(source, UriKind.Absolute, out Uri uriResult) && uriResult.Scheme == Uri.UriSchemeHttps;
用法:
string url = "htts://adasd.xc.";
if(url.CheckUrlValid())
{
//valid process
}
這里的所有答案都允許帶有其他方案的URL(例如, file://
, ftp://
)或拒絕不以http://
或https://
開頭的人類可讀URL(例如, www.google.com
) 在處理用戶輸入時不好 。
我是這樣做的:
public static bool ValidHttpURL(string s, out Uri resultURI)
{
if (!Regex.IsMatch(s, @"^https?:\/\/", RegexOptions.IgnoreCase))
s = "http://" + s;
if (Uri.TryCreate(s, UriKind.Absolute, out resultURI))
return (resultURI.Scheme == Uri.UriSchemeHttp ||
resultURI.Scheme == Uri.UriSchemeHttps);
return false;
}
用法:
string[] inputs = new[] {
"https://www.google.com",
"http://www.google.com",
"www.google.com",
"google.com",
"javascript:alert('Hack me!')"
};
foreach (string s in inputs)
{
Uri uriResult;
bool result = ValidHttpURL(s, out uriResult);
Console.WriteLine(result + "\t" + uriResult?.AbsoluteUri);
}
輸出:
True https://www.google.com/
True http://www.google.com/
True http://www.google.com/
True http://google.com/
False
在Uri.TryCreate
之后,您可以檢查Uri.Scheme
以查看它是否是HTTP(s)。
問題:有效的 URL 應包含以下所有“前綴”:https、http、www
解決方案:
public static bool IsValidUrl(string webSiteUrl)
{
if (webSiteUrl.StartsWith("www."))
{
webSiteUrl = "http://" + webSiteUrl;
}
return Uri.TryCreate(webSiteUrl, UriKind.Absolute, out Uri uriResult)
&& (uriResult.Scheme == Uri.UriSchemeHttp
|| uriResult.Scheme == Uri.UriSchemeHttps) && uriResult.Host.Replace("www.", "").Split('.').Count() > 1 && uriResult.HostNameType == UriHostNameType.Dns && uriResult.Host.Length > uriResult.Host.LastIndexOf(".") + 1 && 100 >= webSiteUrl.Length;
}
通過單元測試驗證
陽性單元測試:
[TestCase("http://www.example.com/")]
[TestCase("https://www.example.com")]
[TestCase("http://example.com")]
[TestCase("https://example.com")]
[TestCase("www.example.com")]
public void IsValidUrlTest(string url)
{
bool result = UriHelper.IsValidUrl(url);
Assert.AreEqual(result, true);
}
否定單元測試:
[TestCase("http.www.example.com")]
[TestCase("http:www.example.com")]
[TestCase("http:/www.example.com")]
[TestCase("http://www.example.")]
[TestCase("http://www.example..com")]
[TestCase("https.www.example.com")]
[TestCase("https:www.example.com")]
[TestCase("https:/www.example.com")]
[TestCase("http:/example.com")]
[TestCase("https:/example.com")]
public void IsInvalidUrlTest(string url)
{
bool result = UriHelper.IsValidUrl(url);
Assert.AreEqual(result, false);
}
注意:IsValidUrl 方法不應驗證任何相對 url 路徑,例如 example.com
見:
這將返回bool:
Uri.IsWellFormedUriString(a.GetAttribute("href"), UriKind.Absolute)
Uri uri = null;
if (!Uri.TryCreate(url, UriKind.Absolute, out uri) || null == uri)
return false;
else
return true;
這里url
是你必須測試的字符串。
試試看:
bool IsValidURL(string URL)
{
string Pattern = @"^(?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=.]+$";
Regex Rgx = new Regex(Pattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);
return Rgx.IsMatch(URL);
}
它將接受這樣的URL:
bool passed = Uri.TryCreate(url, UriKind.Absolute, out Uri uriResult) && (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps)
我創建了這個 function 來幫助我進行 URL 驗證,您可以根據需要自定義它,注意這是用 python3.10.6 編寫的
def url_validator(url: str) -> bool:
"""
use this func to filter out the urls to follow only valid urls
:param: url
:type: str
:return: True if the passed url is valid otherwise return false
:rtype: bool
"""
#the following regex is copied from Django source code
# to validate a url using regax
regex = re.compile(
r"^(?:http|ftp)s?://" # http:// or https://
r"(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|" # domain...
r"localhost|" # localhost...
r"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})" # ...or ip
r"(?::\d+)?" # optional port
r"(?:/?|[/?]\S+)$",
re.IGNORECASE,
)
blocked_sites: list[str] = []
for site in blocked_sites:
if site in url or site == url:
return False
# if none of the above then ensure that the url is valid and then return True otherwise return False
if re.match(regex, url):
return True
return False
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.