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package com.pitchedapps.frost.facebook
import com.pitchedapps.frost.utils.L
/**
* Created by Allan Wang on 2017-07-07.
*
* Custom url builder so we can easily test it without the Android framework
*/
val String.formattedFbUrl: String
get() = FbUrlFormatter(this).toString()
class FbUrlFormatter(url: String) {
private val queries = mutableMapOf<String, String>()
private val cleaned: String
/**
* Formats all facebook urls
*
* The order is very important:
* 1. Wrapper links (discardables) are stripped away, resulting in the actual link
* 2. CSS encoding is converted to normal encoding
* 3. Query portions are separated from the cleaned url
* 4. The cleaned url is decoded. Queries are kept as is!
*/
init {
if (url.isBlank()) cleaned = ""
else {
var cleanedUrl = url
discardable.forEach { cleanedUrl = cleanedUrl.replace(it, "", true) }
val changed = cleanedUrl != url //note that discardables strip away the first '?'
converter.forEach { (k, v) -> cleanedUrl = cleanedUrl.replace(k, v, true) }
val qm = cleanedUrl.indexOf(if (changed) "&" else "?")
if (qm > -1) {
cleanedUrl.substring(qm + 1).split("&").forEach {
val p = it.split("=")
queries.put(p[0], p.elementAtOrNull(1) ?: "")
}
cleanedUrl = cleanedUrl.substring(0, qm)
}
//only decode non query portion of the url
decoder.forEach { (k, v) -> cleanedUrl = cleanedUrl.replace(k, v, true) }
discardableQueries.forEach { queries.remove(it) }
if (cleanedUrl.startsWith("#!")) cleanedUrl = cleanedUrl.substring(2)
if (cleanedUrl.startsWith("/")) cleanedUrl = FB_URL_BASE + cleanedUrl.substring(1)
cleanedUrl = cleanedUrl.replaceFirst(".facebook.com//", ".facebook.com/") //sometimes we are given a bad url
L.v(null, "Formatted url from $url to $cleanedUrl")
cleaned = cleanedUrl
}
}
override fun toString(): String {
val builder = StringBuilder()
builder.append(cleaned)
if (queries.isNotEmpty()) {
builder.append("?")
queries.forEach { (k, v) -> builder.append("$k=$v&") }
}
return builder.removeSuffix("&").toString()
}
fun toLogList(): List<String> {
val list = mutableListOf(cleaned)
queries.forEach { (k, v) -> list.add("\n- $k\t=\t$v") }
list.add("\n\n${toString()}")
return list
}
companion object {
/**
* Items here are explicitly removed from the url
* Taken from FaceSlim
* https://github.com/indywidualny/FaceSlim/blob/master/app/src/main/java/org/indywidualni/fblite/util/Miscellany.java
*/
@JvmStatic
val discardable = arrayOf(
"http://lm.facebook.com/l.php?u=",
"https://lm.facebook.com/l.php?u=",
"http://m.facebook.com/l.php?u=",
"https://m.facebook.com/l.php?u=",
"http://touch.facebook.com/l.php?u=",
"https://touch.facebook.com/l.php?u=",
"/video_redirect/?src="
)
@JvmStatic
val discardableQueries = arrayOf("ref", "refid")
@JvmStatic
val decoder = mapOf(
"%3C" to "<", "%3E" to ">", "%23" to "#", "%25" to "%",
"%7B" to "{", "%7D" to "}", "%7C" to "|", "%5C" to "\\",
"%5E" to "^", "%7E" to "~", "%5B" to "[", "%5D" to "]",
"%60" to "`", "%3B" to ";", "%2F" to "/", "%3F" to "?",
"%3A" to ":", "%40" to "@", "%3D" to "=", "%26" to "&",
"%24" to "$", "%2B" to "+", "%22" to "\"", "%2C" to ",",
"%20" to " "
)
@JvmStatic
val cssDecoder = mapOf(
"\\3C " to "<", "\\3E " to ">", "\\23 " to "#", "\\25 " to "%",
"\\7B " to "{", "\\7D " to "}", "\\7C " to "|", "\\5C " to "\\",
"\\5E " to "^", "\\7E " to "~", "\\5B " to "[", "\\5D " to "]",
"\\60 " to "`", "\\3B " to ";", "\\2F " to "/", "\\3F " to "?",
"\\3A " to ":", "\\40 " to "@", "\\3D " to "=", "\\26 " to "&",
"\\24 " to "$", "\\2B " to "+", "\\22 " to "\"", "\\2C " to ",",
"%20" to " "
)
@JvmStatic
val converter = mapOf(
"\\3C " to "%3C", "\\3E " to "%3E", "\\23 " to "%23", "\\25 " to "%25",
"\\7B " to "%7B", "\\7D " to "%7D", "\\7C " to "%7C", "\\5C " to "%5C",
"\\5E " to "%5E", "\\7E " to "%7E", "\\5B " to "%5B", "\\5D " to "%5D",
"\\60 " to "%60", "\\3B " to "%3B", "\\2F " to "%2F", "\\3F " to "%3F",
"\\3A " to "%3A", "\\40 " to "%40", "\\3D " to "%3D", "\\26 " to "%26",
"\\24 " to "%24", "\\2B " to "%2B", "\\22 " to "%22", "\\2C " to "%2C",
"\\20 " to "%20"
)
}
}
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