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package ai.platon.pulsar.skeleton.crawl.common
import ai.platon.pulsar.common.config.AppConstants
import ai.platon.pulsar.common.urls.UrlUtils.getURLOrNull
import ai.platon.pulsar.skeleton.common.domain.DomainSuffix
import ai.platon.pulsar.skeleton.common.domain.DomainSuffixes
import org.slf4j.LoggerFactory
import java.net.*
import java.nio.file.Path
import java.util.*
/**
* Utility class for URL analysis.
*
* protocol://username:password@hostname:port/pathname?search#hash
* -----------------------------href------------------------------
* -----host----
* ----------- origin -------------
*
* protocol - protocol scheme of the URL, including the final ':'
* hostname - domain name
* port - port number
* pathname - /pathname
* search - ?parameters
* hash - #fragment_identifier
* username - username specified before the domain name
* password - password specified before the domain name
* href - the entire URL
* origin - protocol://hostname:port
* host - hostname:port
*
* TODO: merge with ai.platon.pulsar.common.url.Urls
*/
object URLUtil {
private val logger = LoggerFactory.getLogger(URLUtil::class.java)
private val IP_REGEX = Regex("(\\d{1,3}\\.){3}(\\d{1,3})")
fun getHost(url: String): String? {
val u = getURLOrNull(url) ?: return null
return getHost(u, GroupMode.BY_HOST)
}
fun getHost(url: String, groupMode: GroupMode): String? {
val u = getURLOrNull(url) ?: return null
return getHost(u, groupMode)
}
fun getHost(url: String, defaultHost: String, groupMode: GroupMode): String {
val host = getHost(url, groupMode) ?: return defaultHost
return host.ifEmpty { defaultHost }
}
fun getHost(url: URL, defaultHost: String, groupMode: GroupMode): String {
val host = getHost(url, groupMode) ?: return defaultHost
return host.ifEmpty { defaultHost }
}
fun getHost(url: URL, groupMode: GroupMode): String? {
var host: String?
if (groupMode == GroupMode.BY_IP) {
host = try {
val addr = InetAddress.getByName(url.host)
addr.hostAddress
} catch (e: UnknownHostException) { // unable to resolve it, so don't fall back to host name
logger.warn("Unable to resolve: " + url.host + ", skipping.")
return ""
}
} else if (groupMode == GroupMode.BY_DOMAIN) {
host = getDomainName(url)
if (host == null) {
logger.warn("Unknown domain for url: $url, using URL string as key")
host = url.toExternalForm()
}
} else {
host = url.host
if (host == null) {
logger.warn("Unknown host for url: $url, using URL string as key")
host = url.toExternalForm()
}
}
return host
}
/**
* Returns the domain name of the url. The domain name of a url is the
* substring of the url's hostname, w/o subdomain names. As an example
* `
* getDomainName(conf, new URL(http://lucene.apache.org/))
` *
* will return
* ` apache.org`
*
* @see com.google.common.net.InternetDomainName.topPrivateDomain
*/
fun getDomainName(url: URL): String {
val tlds = DomainSuffixes.getInstance()
var host = url.host
// it seems that java returns hostnames ending with .
if (host.endsWith(".")) host = host.substring(0, host.length - 1)
if (IP_REGEX.matches(host)) return host
var index = 0
var candidate = host
while (index >= 0) {
index = candidate.indexOf('.')
val subCandidate = candidate.substring(index + 1)
if (tlds.isDomainSuffix(subCandidate)) {
return candidate
}
candidate = subCandidate
}
return candidate
}
/**
* Returns the domain name of the url. The domain name of a url is the
* substring of the url's hostname, w/o subdomain names. As an example
* `
* getDomainName(conf, new http://lucene.apache.org/)
` *
* will return
* ` apache.org`
*
* @see com.google.common.net.InternetDomainName.topPrivateDomain
*
* @throws MalformedURLException
*/
@Throws(MalformedURLException::class)
fun getDomainName(url: String): String? {
return getDomainName(URL(url))
}
fun getDomainName(url: String, defaultDomain: String): String {
return kotlin.runCatching { getDomainName(url) }.getOrNull()?:defaultDomain
}
/**
* Returns whether the given urls have the same domain name. As an example,
* ` isSameDomain(new URL("http://lucene.apache.org")
* , new URL("http://people.apache.org/"))
* will return true. `
*
* @return true if the domain names are equal
*/
fun isSameDomainName(url1: URL, url2: URL): Boolean {
return getDomainName(url1).equals(getDomainName(url2), ignoreCase = true)
}
/**
* Returns whether the given urls have the same domain name. As an example,
* ` isSameDomain("http://lucene.apache.org"
* ,"http://people.apache.org/")
* will return true. `
*
* @return true if the domain names are equal
* @throws MalformedURLException
*/
@Throws(MalformedURLException::class)
fun isSameDomainName(url1: String?, url2: String?): Boolean {
return isSameDomainName(URL(url1), URL(url2))
}
/**
* Returns the [DomainSuffix] corresponding to the last public part of
* the hostname
*
* @see com.google.common.net.InternetDomainName.publicSuffix
*/
fun getDomainSuffix(url: String): DomainSuffix? {
val u = getURLOrNull(url) ?: return null
return getDomainSuffix(u)
}
/**
* Returns the [DomainSuffix] corresponding to the last public part of
* the hostname
*
* @see com.google.common.net.InternetDomainName.publicSuffix
*/
fun getDomainSuffix(url: URL): DomainSuffix? {
return getDomainSuffix(DomainSuffixes.getInstance(), url)
}
fun getDomainSuffix(tlds: DomainSuffixes, url: URL): DomainSuffix? { // DomainSuffixes tlds = DomainSuffixes.getInstance();
val host = url.host
if (IP_REGEX.matches(host)) {
return null
}
var index = 0
var candidate = host
while (index >= 0) {
index = candidate.indexOf('.')
val subCandidate = candidate.substring(index + 1)
val d = tlds[subCandidate]
if (d != null) {
return d
}
candidate = subCandidate
}
return null
}
/**
* Returns the [DomainSuffix] corresponding to the last public part of
* the hostname
*/
@Throws(MalformedURLException::class)
fun getDomainSuffix(tlds: DomainSuffixes, url: String?): DomainSuffix? {
return getDomainSuffix(tlds, URL(url))
}
/** Partitions of the hostname of the url by "." */
fun getHostBatches(url: URL): List {
val host = url.host
// return whole hostname, if it is an ipv4
// TODO : handle ipv6
return if (IP_REGEX.matches(host)) listOf(host) else host.split(".")
}
/**
* Partitions of the hostname of the url by "."
*
* @throws MalformedURLException
*/
@Throws(MalformedURLException::class)
fun getHostBatches(url: String): List {
return getHostBatches(URL(url))
}
/**
* Given two urls, a src and a destination of a redirect, it returns the
* representative url.
*
* This method implements an extended version of the algorithm used by the
* Yahoo! Slurp crawler described here:
* [ How
* does the Yahoo! webcrawler handle redirects?](http://help.yahoo.com/l/nz/yahooxtra/search/webcrawler/slurp-11.html)
*
*
* 1. Choose target url if either url is malformed.
* 1. If different domains the keep the destination whether or not the
* redirect is temp or perm
*
* * a.com -> b.com*
*
* 1. If the redirect is permanent and the source is root, keep the source.
*
* * *a.com -> a.com?y=1 || *a.com -> a.com/xyz/index.html
*
* 1. If the redirect is permanent and the source is not root and the
* destination is root, keep the destination
*
* * a.com/xyz/index.html -> a.com*
*
* 1. If the redirect is permanent and neither the source nor the destination
* is root, then keep the destination
*
* * a.com/xyz/index.html -> a.com/abc/page.html*
*
* 1. If the redirect is temporary and source is root and destination is not
* root, then keep the source
*
* * *a.com -> a.com/xyz/index.html
*
* 1. If the redirect is temporary and source is not root and destination is
* root, then keep the destination
*
* * a.com/xyz/index.html -> a.com*
*
* 1. If the redirect is temporary and neither the source or the destination
* is root, then keep the shortest url. First check for the shortest host, and
* if both are equal then check by path. Path is first by length then by the
* number of / path separators.
*
* * a.com/xyz/index.html -> a.com/abc/page.html*
* * *www.a.com/xyz/index.html -> www.news.a.com/xyz/index.html
*
* 1. If the redirect is temporary and both the source and the destination
* are root, then keep the shortest sub-domain
*
* * *www.a.com -> www.news.a.com
*
*
* While not in this logic there is a further piece of representative url
* logic that occurs during indexing and after scoring. During creation of the
* basic fields before indexing, if a url has a representative url stored we
* check both the url and its representative url (which should never be the
* same) against their linkrank scores and the highest scoring one is kept as
* the url and the lower scoring one is held as the orig url inside of the
* index.
*
* @param src
* The source url.
* @param dst
* The destination url.
* @param temp
* Is the redirect a temporary redirect.
*
* @return String The representative url.
*/
@JvmStatic
fun chooseRepr(src: String, dst: String, temp: Boolean): String { // validate both are well formed urls
val srcUrl: URL
val dstUrl: URL
try {
srcUrl = URL(src)
dstUrl = URL(dst)
} catch (e: MalformedURLException) {
return dst
}
// get the source and destination domain, host, and page
val srcDomain = getDomainName(srcUrl)
val dstDomain = getDomainName(dstUrl)
val srcHost = srcUrl.host
val dstHost = dstUrl.host
val srcFile = srcUrl.file
val dstFile = dstUrl.file
// are the source and destination the root path url.com/ or url.com
val srcRoot = srcFile == "/" || srcFile.length == 0
val destRoot = dstFile == "/" || dstFile.length == 0
// 1) different domain them keep dest, temp or perm
// a.com -> b.com*
//
// 2) permanent and root, keep src
// *a.com -> a.com?y=1 || *a.com -> a.com/xyz/index.html
//
// 3) permanent and not root and dest root, keep dest
// a.com/xyz/index.html -> a.com*
//
// 4) permanent and neither root keep dest
// a.com/xyz/index.html -> a.com/abc/page.html*
//
// 5) temp and root and dest not root keep src
// *a.com -> a.com/xyz/index.html
//
// 7) temp and not root and dest root keep dest
// a.com/xyz/index.html -> a.com*
//
// 8) temp and neither root, keep shortest, if hosts equal by path else by
// hosts. paths are first by length then by number of / separators
// a.com/xyz/index.html -> a.com/abc/page.html*
// *www.a.com/xyz/index.html -> www.news.a.com/xyz/index.html
//
// 9) temp and both root keep shortest sub domain
// *www.a.com -> www.news.a.com
// if we are dealing with a redirect from one domain to another keep the
// destination
if (srcDomain != dstDomain) {
return dst
}
// if it is a permanent redirect
return if (!temp) { // if source is root return source, otherwise destination
if (srcRoot) {
src
} else {
dst
}
} else {
// temporary redirect
// source root and destination not root
if (srcRoot && !destRoot) {
src
} else if (!srcRoot && destRoot) { // destination root and source not
dst
} else if (!srcRoot && !destRoot && srcHost == dstHost) { // source and destination hosts are the same, check paths, host length
val numSrcPaths = srcFile.split("/").toTypedArray().size
val numDstPaths = dstFile.split("/").toTypedArray().size
if (numSrcPaths != numDstPaths) {
if (numDstPaths < numSrcPaths) dst else src
} else {
val srcPathLength = srcFile.length
val dstPathLength = dstFile.length
if (dstPathLength < srcPathLength) dst else src
}
} else { // different host names and both root take the shortest
val numSrcSubs = srcHost.split("\\.").toTypedArray().size
val numDstSubs = dstHost.split("\\.").toTypedArray().size
if (numDstSubs < numSrcSubs) dst else src
}
}
}
/**
* Returns the lowercase origin for the url.
*
* @param url The url to check.
* @return String The hostname for the url.
*/
@Throws(MalformedURLException::class)
fun getOrigin(url: String): String {
val u = URL(url)
return u.protocol + "://" + u.host
}
/**
* Returns the lowercase origin for the url or null if the url is not well-formed.
*
* @param url The url to check.
* @return String The hostname for the url.
*/
fun getOriginOrNull(url: String?): String? {
if (url == null) {
return null
}
return try {
val u = URL(url)
u.protocol + "://" + u.host
} catch (t: Throwable) {
null
}
}
/**
* Returns the lowercase hostname for the url.
*
* @param url The url to check.
* @return String The hostname for the url.
*/
@Throws(MalformedURLException::class)
fun getHostName(url: String) = URL(url).host.lowercase(Locale.getDefault())
/**
* Returns the lowercase hostname for the url or null if the url is not well-formed.
*
* @param url The url to check.
* @return String The hostname for the url.
*/
fun getHostNameOrNull(url: String?): String? {
if (url == null) {
return null
}
return try {
URL(url).host.lowercase(Locale.getDefault())
} catch (e: MalformedURLException) {
null
}
}
fun getHostName(url: String?, defaultValue: String): String {
return try {
URL(url).host.lowercase(Locale.getDefault())
} catch (e: MalformedURLException) {
defaultValue
}
}
/**
* Returns the path for the url. The path consists of the protocol, host, and
* path, but does not include the query string. The host is lowercased but the
* path is not.
*
* @param url
* The url to check.
* @return String The path for the url.
*/
fun getQuery(url: String): String? {
var url = url
return try { // get the full url, and replace the query string with and empty string
url = url.lowercase(Locale.getDefault())
val queryStr = URL(url).query
if (queryStr != null) url.replace("?$queryStr", "") else url
} catch (e: MalformedURLException) {
null
}
}
@JvmStatic
fun toASCII(url: String?): String? {
return try {
val u = URL(url)
val host = u.host
if (host == null || host.isEmpty()) {
// no host name => no punycoded domain name
// also do not add additional slashes for file: URLs (PULSAR-1880)
return url
}
val p = URI(u.protocol, u.userInfo, IDN.toASCII(host),
u.port, u.path, u.query, u.ref)
p.toString()
} catch (e: Exception) {
null
}
}
@JvmStatic
fun toUNICODE(url: String?): String? {
return try {
val u = URL(url)
val host = u.host
if (host == null || host.isEmpty()) {
// no host name => no punycoded domain name
// also do not add additional slashes for file: URLs (PULSAR-1880)
return url
}
val sb = StringBuilder()
sb.append(u.protocol)
sb.append("://")
if (u.userInfo != null) {
sb.append(u.userInfo)
sb.append('@')
}
sb.append(IDN.toUnicode(host))
if (u.port != -1) {
sb.append(':')
sb.append(u.port)
}
sb.append(u.file) // includes query
if (u.ref != null) {
sb.append('#')
sb.append(u.ref)
}
sb.toString()
} catch (e: Exception) {
null
}
}
fun pathToUrl(path: Path): String {
val base64 = Base64.getUrlEncoder().encode(path.toString().toByteArray()).toString(Charsets.UTF_8)
val prefix = AppConstants.LOCAL_FILE_SERVE_PREFIX
return "$prefix?path=$base64"
}
fun isLocalFile(url: String): Boolean {
return url.startsWith(AppConstants.LOCAL_FILE_SERVE_PREFIX)
}
/**
* @see URLUtil
*/
enum class GroupMode {
BY_IP, BY_DOMAIN, BY_HOST
}
}
