mirror of
https://github.com/vitorpamplona/amethyst.git
synced 2024-10-02 18:00:44 +00:00
Merge pull request #818 from jiftechnify/url-preview
Fix garbled URL preview for non UTF-8 HTML, with optimization
This commit is contained in:
commit
d61d684a27
@ -205,9 +205,6 @@ dependencies {
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// Websockets API
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implementation libs.okhttp
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// HTML Parsing for Link Preview
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implementation libs.jsoup
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// Encrypted Key Storage
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implementation libs.androidx.security.crypto.ktx
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@ -0,0 +1,311 @@
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/**
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* Copyright (c) 2024 Vitor Pamplona
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
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* Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package com.vitorpamplona.amethyst.service.previews
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import kotlinx.collections.immutable.toImmutableMap
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import java.lang.StringBuilder
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internal data class MetaTag(private val attrs: Map<String, String>) {
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fun attr(name: String): String = attrs[name.lowercase()] ?: ""
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}
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// parse a partial HTML document and extract meta tags
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internal object MetaTagsParser {
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private val NON_ATTR_NAME_CHARS = setOf(Char(0x0), '"', '\'', '>', '/')
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private val NON_UNQUOTED_ATTR_VALUE_CHARS = setOf('"', '\'', '=', '>', '<', '`')
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fun parse(input: String): Sequence<MetaTag> =
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sequence {
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val s = TagScanner(input)
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while (!s.exhausted()) {
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val t = s.nextTag() ?: continue
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if (t.name == "/head") {
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break
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}
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if (t.name == "meta") {
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val attrs = parseAttrs(t.attrPart) ?: continue
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yield(MetaTag(attrs))
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}
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}
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}
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private data class RawTag(val name: String, val attrPart: String)
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private class TagScanner(private val input: String) {
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var p = 0
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fun exhausted(): Boolean = p >= input.length
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private fun peek(): Char = input[p]
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private fun consume(): Char {
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return input[p++]
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}
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private fun consumeChar(c: Char): Boolean {
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if (this.peek() == c) {
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this.consume()
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return true
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}
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return false
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}
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private fun skipSpaces() {
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while (!this.exhausted() && this.peek().isWhitespace()) {
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this.consume()
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}
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}
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private fun skipUntil(c: Char) {
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while (!this.exhausted() && this.peek() != c) {
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this.consume()
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}
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}
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private fun readWhile(pred: (Char) -> Boolean): String {
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val sb = StringBuilder()
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while (!this.exhausted() && pred(this.peek())) {
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sb.append(this.consume())
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}
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return sb.toString()
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}
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fun nextTag(): RawTag? {
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skipUntil('<')
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consume()
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// read tag name
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val name = StringBuilder()
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if (consumeChar('/')) {
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name.append('/')
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}
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val n = readWhile { !it.isWhitespace() && it != '>' }
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skipSpaces()
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// read until end of tag
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val attrsPart = StringBuilder()
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var quote: Char? = null
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while (!exhausted()) {
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val c = consume()
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when {
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// `/>` out of quote -> end of tag
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quote == null && c == '/' && peek() == '>' -> {
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consume()
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break
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}
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// `>` out of quote -> end of tag
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quote == null && c == '>' -> {
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break
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}
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// entering quote
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quote == null && (c == '\'' || c == '"') -> {
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quote = c
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}
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// leaving quote
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quote != null && c == quote -> {
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quote = null
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}
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}
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attrsPart.append(c)
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}
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if (!n.matches(Regex("""[0-9a-zA-Z]+"""))) {
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return null
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}
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return RawTag(name.append(n).toString().lowercase(), attrsPart.toString())
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}
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}
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// map of HTML element attribute name to its value, with additional logics:
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// - attribute names are matched in a case-insensitive manner
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// - attribute names never duplicate
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// - commonly used character references in attribute values are resolved
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private class Attrs {
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companion object {
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val RE_CHAR_REF = Regex("""&(\w+)(;?)""")
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val BASE_CHAR_REFS =
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mapOf(
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"amp" to "&",
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"AMP" to "&",
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"quot" to "\"",
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"QUOT" to "\"",
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"lt" to "<",
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"LT" to "<",
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"gt" to ">",
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"GT" to ">",
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)
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val CHAR_REFS =
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mapOf(
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"apos" to "'",
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"equals" to "=",
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"grave" to "`",
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"DiacriticalGrave" to "`",
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)
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fun replaceCharRefs(match: MatchResult): String {
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val bcr = BASE_CHAR_REFS[match.groupValues[1]]
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if (bcr != null) {
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return bcr
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}
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// non-base char refs must be terminated by ';'
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if (match.groupValues[2].isNotEmpty()) {
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val cr = CHAR_REFS[match.groupValues[1]]
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if (cr != null) {
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return cr
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}
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}
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return match.value
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}
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}
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private val attrs = mutableMapOf<String, String>()
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fun add(attr: Pair<String, String>) {
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val name = attr.first.lowercase()
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if (attrs.containsKey(name)) {
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throw IllegalArgumentException("duplicated attribute name: $name")
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}
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val value = attr.second.replace(RE_CHAR_REF, Companion::replaceCharRefs)
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attrs += Pair(name, value)
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}
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fun freeze(): Map<String, String> = attrs.toImmutableMap()
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}
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private enum class State {
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NAME,
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BEFORE_EQ,
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AFTER_EQ,
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VALUE,
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SPACE,
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}
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private fun parseAttrs(input: String): Map<String, String>? {
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val attrs = Attrs()
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var state = State.NAME
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var nameBegin = 0
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var nameEnd = 0
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var valueBegin = 0
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var valueQuote: Char? = null
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input.forEachIndexed { i, c ->
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when (state) {
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State.NAME -> {
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when {
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c == '=' -> {
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nameEnd = i
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state = State.AFTER_EQ
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}
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c.isWhitespace() -> {
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nameEnd = i
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state = State.BEFORE_EQ
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}
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NON_ATTR_NAME_CHARS.contains(c) || c.isISOControl() || !c.isDefined() -> {
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return null
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}
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}
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}
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State.BEFORE_EQ -> {
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when {
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c == '=' -> {
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state = State.AFTER_EQ
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}
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c.isWhitespace() -> {}
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else -> return null
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}
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}
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State.AFTER_EQ -> {
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when {
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c.isWhitespace() -> {}
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c == '\'' || c == '"' -> {
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valueBegin = i + 1
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valueQuote = c
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state = State.VALUE
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}
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else -> {
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valueBegin = i
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valueQuote = null
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state = State.VALUE
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}
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}
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}
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State.VALUE -> {
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var attr: Pair<String, String>? = null
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when {
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valueQuote != null -> {
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if (c == valueQuote) {
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attr =
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Pair(
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input.slice(nameBegin..<nameEnd),
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input.slice(valueBegin..<i),
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)
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}
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}
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valueQuote == null -> {
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when {
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c.isWhitespace() -> {
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attr =
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Pair(
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input.slice(nameBegin..<nameEnd),
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input.slice(valueBegin..<i),
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)
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}
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i == input.length - 1 -> {
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attr =
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Pair(
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input.slice(nameBegin..<nameEnd),
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input.slice(valueBegin..i),
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)
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}
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NON_UNQUOTED_ATTR_VALUE_CHARS.contains(c) -> {
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return null
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}
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}
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}
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}
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if (attr != null) {
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runCatching { attrs.add(attr) }.getOrNull() ?: return null
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state = State.SPACE
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}
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}
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State.SPACE -> {
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if (!c.isWhitespace()) {
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nameBegin = i
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state = State.NAME
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}
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}
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}
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}
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return attrs.freeze()
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}
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}
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@ -27,60 +27,39 @@ import kotlinx.coroutines.withContext
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import okhttp3.MediaType
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import okhttp3.MediaType.Companion.toMediaType
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import okhttp3.Request
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import org.jsoup.Jsoup
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import org.jsoup.nodes.Document
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import okio.BufferedSource
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import okio.ByteString.Companion.decodeHex
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import okio.Options
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import java.nio.charset.Charset
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private const val ELEMENT_TAG_META = "meta"
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private const val ATTRIBUTE_VALUE_PROPERTY = "property"
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private const val ATTRIBUTE_VALUE_NAME = "name"
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private const val ATTRIBUTE_VALUE_ITEMPROP = "itemprop"
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private const val ATTRIBUTE_VALUE_CHARSET = "charset"
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private const val ATTRIBUTE_VALUE_HTTP_EQUIV = "http-equiv"
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// for <meta itemprop=... to get title
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private val META_X_TITLE =
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arrayOf(
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"og:title",
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"\"og:title\"",
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"'og:title'",
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"name",
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"\"name\"",
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"'name'",
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"twitter:title",
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"\"twitter:title\"",
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"'twitter:title'",
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"title",
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"\"title\"",
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"'title'",
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)
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// for <meta itemprop=... to get description
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private val META_X_DESCRIPTION =
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arrayOf(
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"og:description",
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"\"og:description\"",
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"'og:description'",
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"description",
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"\"description\"",
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"'description'",
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"twitter:description",
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"\"twitter:description\"",
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"'twitter:description'",
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"description",
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"\"description\"",
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"'description'",
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)
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// for <meta itemprop=... to get image
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private val META_X_IMAGE =
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arrayOf(
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"og:image",
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"\"og:image\"",
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"'og:image'",
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"image",
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"\"image\"",
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"'image'",
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"twitter:image",
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"\"twitter:image\"",
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"'twitter:image'",
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"image",
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)
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private const val CONTENT = "content"
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@ -95,14 +74,12 @@ suspend fun getDocument(
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checkNotInMainThread()
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if (it.isSuccessful) {
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val mimeType =
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it.headers.get("Content-Type")?.toMediaType()
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it.headers["Content-Type"]?.toMediaType()
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?: throw IllegalArgumentException(
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"Website returned unknown mimetype: ${it.headers.get("Content-Type")}",
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"Website returned unknown mimetype: ${it.headers["Content-Type"]}",
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)
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if (mimeType.type == "text" && mimeType.subtype == "html") {
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val document = Jsoup.parse(it.body.string())
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parseHtml(url, document, mimeType)
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parseHtml(url, it.body.source(), mimeType)
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} else if (mimeType.type == "image") {
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UrlInfoItem(url, image = url, mimeType = mimeType)
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} else if (mimeType.type == "video") {
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@ -120,12 +97,82 @@ suspend fun getDocument(
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suspend fun parseHtml(
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url: String,
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document: Document,
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source: BufferedSource,
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type: MediaType,
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): UrlInfoItem =
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withContext(Dispatchers.IO) {
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val metaTags = document.getElementsByTag(ELEMENT_TAG_META)
|
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// sniff charset from Content-Type header or BOM
|
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val sniffedCharset = type.charset() ?: source.readBomAsCharset()
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if (sniffedCharset != null) {
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val metaTags = MetaTagsParser.parse(source.readByteArray().toString(sniffedCharset))
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return@withContext extractUrlInfo(url, metaTags, type)
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}
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|
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// if sniffing was failed, detect charset from content
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val bodyBytes = source.readByteArray()
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val charset = detectCharset(bodyBytes)
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val metaTags = MetaTagsParser.parse(bodyBytes.toString(charset))
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return@withContext extractUrlInfo(url, metaTags, type)
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}
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|
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// taken from okhttp
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private val UNICODE_BOMS =
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Options.of(
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// UTF-8
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"efbbbf".decodeHex(),
|
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// UTF-16BE
|
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"feff".decodeHex(),
|
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// UTF-16LE
|
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"fffe".decodeHex(),
|
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// UTF-32BE
|
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"0000ffff".decodeHex(),
|
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// UTF-32LE
|
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"ffff0000".decodeHex(),
|
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)
|
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|
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private fun BufferedSource.readBomAsCharset(): Charset? {
|
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return when (select(UNICODE_BOMS)) {
|
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0 -> Charsets.UTF_8
|
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1 -> Charsets.UTF_16BE
|
||||
2 -> Charsets.UTF_16LE
|
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3 -> Charsets.UTF_32BE
|
||||
4 -> Charsets.UTF_32LE
|
||||
-1 -> null
|
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else -> throw AssertionError()
|
||||
}
|
||||
}
|
||||
|
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private val RE_CONTENT_TYPE_CHARSET = Regex("""charset=([^;]+)""")
|
||||
|
||||
private fun detectCharset(bodyBytes: ByteArray): Charset {
|
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// try to detect charset from meta tags parsed from first 1024 bytes of body
|
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val firstPart = String(bodyBytes, 0, 1024, Charset.forName("utf-8"))
|
||||
val metaTags = MetaTagsParser.parse(firstPart)
|
||||
metaTags.forEach { meta ->
|
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val charsetAttr = meta.attr(ATTRIBUTE_VALUE_CHARSET)
|
||||
if (charsetAttr.isNotEmpty()) {
|
||||
runCatching { Charset.forName(charsetAttr) }.getOrNull()?.let {
|
||||
return it
|
||||
}
|
||||
}
|
||||
if (meta.attr(ATTRIBUTE_VALUE_HTTP_EQUIV).lowercase() == "content-type") {
|
||||
RE_CONTENT_TYPE_CHARSET.find(meta.attr(CONTENT))
|
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?.let {
|
||||
runCatching { Charset.forName(it.groupValues[1]) }.getOrNull()
|
||||
}?.let {
|
||||
return it
|
||||
}
|
||||
}
|
||||
}
|
||||
// defaults to UTF-8
|
||||
return Charset.forName("utf-8")
|
||||
}
|
||||
|
||||
private fun extractUrlInfo(
|
||||
url: String,
|
||||
metaTags: Sequence<MetaTag>,
|
||||
type: MediaType,
|
||||
): UrlInfoItem {
|
||||
var title: String = ""
|
||||
var description: String = ""
|
||||
var image: String = ""
|
||||
@ -136,10 +183,12 @@ suspend fun parseHtml(
|
||||
if (title.isEmpty()) {
|
||||
title = it.attr(CONTENT)
|
||||
}
|
||||
|
||||
in META_X_DESCRIPTION ->
|
||||
if (description.isEmpty()) {
|
||||
description = it.attr(CONTENT)
|
||||
}
|
||||
|
||||
in META_X_IMAGE ->
|
||||
if (image.isEmpty()) {
|
||||
image = it.attr(CONTENT)
|
||||
@ -151,10 +200,12 @@ suspend fun parseHtml(
|
||||
if (title.isEmpty()) {
|
||||
title = it.attr(CONTENT)
|
||||
}
|
||||
|
||||
in META_X_DESCRIPTION ->
|
||||
if (description.isEmpty()) {
|
||||
description = it.attr(CONTENT)
|
||||
}
|
||||
|
||||
in META_X_IMAGE ->
|
||||
if (image.isEmpty()) {
|
||||
image = it.attr(CONTENT)
|
||||
@ -166,10 +217,12 @@ suspend fun parseHtml(
|
||||
if (title.isEmpty()) {
|
||||
title = it.attr(CONTENT)
|
||||
}
|
||||
|
||||
in META_X_DESCRIPTION ->
|
||||
if (description.isEmpty()) {
|
||||
description = it.attr(CONTENT)
|
||||
}
|
||||
|
||||
in META_X_IMAGE ->
|
||||
if (image.isEmpty()) {
|
||||
image = it.attr(CONTENT)
|
||||
@ -177,8 +230,8 @@ suspend fun parseHtml(
|
||||
}
|
||||
|
||||
if (title.isNotEmpty() && description.isNotEmpty() && image.isNotEmpty()) {
|
||||
return@withContext UrlInfoItem(url, title, description, image, type)
|
||||
return UrlInfoItem(url, title, description, image, type)
|
||||
}
|
||||
}
|
||||
return@withContext UrlInfoItem(url, title, description, image, type)
|
||||
return UrlInfoItem(url, title, description, image, type)
|
||||
}
|
||||
|
@ -0,0 +1,81 @@
|
||||
/**
|
||||
* Copyright (c) 2024 Vitor Pamplona
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||||
* this software and associated documentation files (the "Software"), to deal in
|
||||
* the Software without restriction, including without limitation the rights to use,
|
||||
* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
|
||||
* Software, and to permit persons to whom the Software is furnished to do so,
|
||||
* subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
||||
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
||||
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
||||
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||||
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
*/
|
||||
package com.vitorpamplona.amethyst.service.previews
|
||||
|
||||
import org.junit.Assert.assertEquals
|
||||
import org.junit.Test
|
||||
|
||||
class MetaTagsParserTest {
|
||||
@Test
|
||||
fun testParse() {
|
||||
val input =
|
||||
"""<html>
|
||||
| <head>
|
||||
| <meta charset="utf-8">
|
||||
| <meta http-equiv="content-type" content="text/html; charset=utf-8">
|
||||
| <meta property="og:title" content=title>
|
||||
| <meta property="og:description" content='description'>
|
||||
| <meta property="og:image" content="https://example.com/img/foo.png">
|
||||
| <!-- edge cases -->
|
||||
| <meta
|
||||
| name="newline"
|
||||
| content="newline"
|
||||
| >
|
||||
| <meta name="space before gt" >
|
||||
| <meta name ="space before =">
|
||||
| <meta name= "space after =">
|
||||
| <META NAME="CAPITAL">
|
||||
| <meta name="character reference" content="<meta>">
|
||||
| <meta name="attr value with end of head doesn't harm" content="<head>bang!</head>">
|
||||
| <meta name="ignore tags with duplicated attr" name="dup">
|
||||
| </head>
|
||||
| <body>
|
||||
| <meta name="ignore meta tags in body">
|
||||
| </body>
|
||||
|</html>
|
||||
""".trimMargin()
|
||||
|
||||
val exp =
|
||||
listOf(
|
||||
listOf("charset" to "utf-8"),
|
||||
listOf("http-equiv" to "content-type", "content" to "text/html; charset=utf-8"),
|
||||
listOf("property" to "og:title", "content" to "title"),
|
||||
listOf("property" to "og:description", "content" to "description"),
|
||||
listOf("property" to "og:image", "content" to "https://example.com/img/foo.png"),
|
||||
listOf("name" to "newline", "content" to "newline"),
|
||||
listOf("name" to "space before gt"),
|
||||
listOf("name" to "space before ="),
|
||||
listOf("name" to "space after ="),
|
||||
listOf("name" to "CAPITAL"),
|
||||
listOf("name" to "character reference", "content" to "<meta>"),
|
||||
listOf("name" to "attr value with end of head doesn't harm", "content" to "<head>bang!</head>"),
|
||||
)
|
||||
|
||||
val metaTags = MetaTagsParser.parse(input).toList()
|
||||
println(metaTags)
|
||||
assertEquals(exp.size, metaTags.size)
|
||||
metaTags.zip(exp).forEach { (meta, expAttrs) ->
|
||||
expAttrs.forEach { (name, expValue) ->
|
||||
assertEquals(expValue, meta.attr(name))
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
@ -20,7 +20,6 @@ fragmentKtx = "1.6.2"
|
||||
gms = "4.4.1"
|
||||
jacksonModuleKotlin = "2.17.0"
|
||||
jna = "5.14.0"
|
||||
jsoup = "1.17.2"
|
||||
junit = "4.13.2"
|
||||
kotlin = "1.9.22"
|
||||
kotlinxCollectionsImmutable = "0.3.7"
|
||||
@ -93,7 +92,6 @@ google-mlkit-language-id = { group = "com.google.mlkit", name = "language-id", v
|
||||
google-mlkit-translate = { group = "com.google.mlkit", name = "translate", version.ref = "translate" }
|
||||
jackson-module-kotlin = { group = "com.fasterxml.jackson.module", name = "jackson-module-kotlin", version.ref = "jacksonModuleKotlin" }
|
||||
jna = { group = "net.java.dev.jna", name = "jna", version.ref = "jna" }
|
||||
jsoup = { group = "org.jsoup", name = "jsoup", version.ref = "jsoup" }
|
||||
junit = { group = "junit", name = "junit", version.ref = "junit" }
|
||||
kotlinx-collections-immutable = { group = "org.jetbrains.kotlinx", name = "kotlinx-collections-immutable", version.ref = "kotlinxCollectionsImmutable" }
|
||||
lazysodium-android = { group = "com.goterl", name = "lazysodium-android", version.ref = "lazysodiumAndroid" }
|
||||
|
Loading…
Reference in New Issue
Block a user