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package email.schaal.ocreader.view
import android.annotation.SuppressLint
import android.content.Context
import android.util.AttributeSet
import android.util.Log
import androidx.annotation.ColorInt
import androidx.core.content.ContextCompat
import androidx.core.content.res.use
import androidx.preference.PreferenceManager
import email.schaal.ocreader.Preferences
import email.schaal.ocreader.R
import email.schaal.ocreader.database.model.Item
import email.schaal.ocreader.util.FaviconLoader
import email.schaal.ocreader.util.FaviconLoader.FeedColorsListener
import email.schaal.ocreader.util.FeedColors
import email.schaal.ocreader.util.asCssString
import email.schaal.ocreader.util.getByLine
import org.jsoup.Jsoup
import org.jsoup.nodes.Document
import org.jsoup.safety.Cleaner
import org.jsoup.safety.Whitelist
import java.util.*
import java.util.regex.Pattern
/**
* WebView to display a Item
*/
@SuppressLint("SetJavaScriptEnabled")
class ArticleWebView(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0): NestedScrollWebView(context, attrs, defStyleAttr) {
@ColorInt private var defaultLinkColor = 0
@ColorInt private var fontColor = 0
@ColorInt private var backColor = 0
private var item: Item? = null
constructor(context: Context, attrs: AttributeSet?) : this(context, attrs, 0)
constructor(context: Context) : this(context, null)
private val feedColorsListener: FeedColorsListener = object : FeedColorsListener {
override fun onGenerated(feedColors: FeedColors) {
evaluateJavascript(
resources.getString(
R.string.style_change_js,
feedColors.getColor(FeedColors.Type.TEXT, defaultLinkColor).asCssString()
), null
)
}
override fun onStart() {}
}
init {
context.obtainStyledAttributes(attrs, R.styleable.ArticleWebView).use { typedArray ->
defaultLinkColor = typedArray.getColor(R.styleable.ArticleWebView_linkColor, 0)
fontColor = typedArray.getColor(R.styleable.ArticleWebView_fontColor, 0)
backColor = typedArray.getColor(R.styleable.ArticleWebView_backgroundColor, 0)
}
setBackgroundColor(backColor)
settings.apply {
javaScriptEnabled = true
builtInZoomControls = true
displayZoomControls = false
offscreenPreRaster = true
}
}
fun setItem(item: Item?) {
this.item = item
loadDataWithBaseURL("file:///android_asset/", html, "text/html", "UTF-8", null)
postVisualStateCallback(1, object: VisualStateCallback() {
override fun onComplete(requestId: Long) {
FaviconLoader.Builder()
.build()
.load(this@ArticleWebView.context, item?.feed, feedColorsListener)
}
})
}
private val html: String
get() {
val context = context
val font = Preferences.ARTICLE_FONT.getString(PreferenceManager.getDefaultSharedPreferences(context))
var document = Jsoup.parse(item?.body)
document = cleaner.clean(document)
val firstImgString = extractFirstImg(document)
prepareDocument(document)
document.outputSettings().prettyPrint(false)
return context.getString(R.string.article_html_template,
defaultLinkColor.asCssString(),
fontColor.asCssString(),
backColor.asCssString(),
ContextCompat.getColor(context, R.color.selected_background).asCssString(),
item?.url ?: "",
item?.title,
getByLine(context, "<p class=\"byline\">%s</p>", item?.author, item?.feed),
document.body().html(),
firstImgString,
if ("system" != font) context.getString(R.string.crimson_font_css) else ""
)
}
private fun extractFirstImg(document: Document): String {
var firstImgString = ""
try {
var child = document.body().child(0)
// if document starts with <br>, remove it
if (child?.tagName() == "br") {
val brChild = child
child = child.nextElementSibling()
brChild.remove()
}
while (child != null && child.tagName() != "img") {
child = child.children().first()
}
if (child != null) {
child.remove()
child.addClass("headerimg")
firstImgString = child.toString()
}
} catch (e: IndexOutOfBoundsException) {
Log.e(TAG, "Body has no children", e)
}
return firstImgString
}
/**
* Enum to convert some common iframe urls to simpler formats
*/
private enum class IframePattern(val pattern: Pattern, val baseUrl: String, val thumbUrl: String?) {
YOUTUBE(Pattern.compile("(https?://)(?:www\\.)?youtube\\.com/embed/([a-zA-Z0-9-_]+)(?:\\?.*)?"), "youtu.be/", "%simg.youtube.com/vi/%s/sddefault.jpg"),
VIMEO(Pattern.compile("(https?://)(?:www\\.)?player\\.vimeo\\.com/video/([a-zA-Z0-9]+)"), "vimeo.com/", null);
}
private fun prepareDocument(document: Document) {
val iframes = document.getElementsByTag("iframe")
for (iframe in iframes) {
if (iframe.hasAttr("src")) {
var href = iframe.attr("src")
var html = String.format(Locale.US, videoLink, href, href)
// Check if url matches any known patterns
for (iframePattern in IframePattern.values()) {
val matcher = iframePattern.pattern.matcher(href)
if (matcher.matches()) {
val videoId = matcher.group(2)
val urlPrefix = matcher.group(1) ?: "https://"
href = urlPrefix + iframePattern.baseUrl + videoId
// use thumbnail if available
if (iframePattern.thumbUrl != null) {
val thumbUrl = String.format(iframePattern.thumbUrl, urlPrefix, videoId)
html = String.format(Locale.US, videoThumbLink, href, thumbUrl)
}
break
}
}
iframe.replaceWith(Jsoup.parse(html).body().child(0))
} else {
iframe.remove()
}
}
}
companion object {
private val TAG = ArticleWebView::class.java.name
// iframes are replaced in prepareDocument()
private val cleaner = Cleaner(Whitelist.relaxed().addTags("video", "iframe").addAttributes("iframe", "src"))
private const val videoThumbLink = """<div style="position:relative"><a href="%s"><img src="%s" class="videothumb"></img><span class="play">▶</span></a></div>"""
private const val videoLink = """<a href="%s">%s</a>"""
}
}
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