From 952d4e41efc21f1276e8b03892e1e8079a727a1b Mon Sep 17 00:00:00 2001
From: Allan Wang <me@allanwang.ca>
Date: Sun, 24 Sep 2017 17:53:07 -0400
Subject: Feature/compact formatter (#337)

* Make components private and thus jvm fields

* Split converter and decoder

* Update changelog

* Only decode nonquery portions of links

* Add comments and fix test
---
 .../pitchedapps/frost/facebook/FbUrlFormatter.kt   | 39 ++++++++++++++++++----
 .../com/pitchedapps/frost/facebook/FbUrlTest.kt    |  4 +--
 2 files changed, 34 insertions(+), 9 deletions(-)

(limited to 'app')

diff --git a/app/src/main/kotlin/com/pitchedapps/frost/facebook/FbUrlFormatter.kt b/app/src/main/kotlin/com/pitchedapps/frost/facebook/FbUrlFormatter.kt
index cd7d9002..542277b8 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/facebook/FbUrlFormatter.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/facebook/FbUrlFormatter.kt
@@ -11,16 +11,25 @@ val String.formattedFbUrl: String
     get() = FbUrlFormatter(this).toString()
 
 class FbUrlFormatter(url: String) {
-    val queries = mutableMapOf<String, String>()
-    val cleaned: 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 ?
-            decoder.forEach { (k, v) -> cleanedUrl = cleanedUrl.replace(k, v, 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 {
@@ -29,6 +38,8 @@ class FbUrlFormatter(url: String) {
                 }
                 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)
@@ -83,15 +94,29 @@ class FbUrlFormatter(url: String) {
                 "%60" to "`", "%3B" to ";", "%2F" to "/", "%3F" to "?",
                 "%3A" to ":", "%40" to "@", "%3D" to "=", "%26" to "&",
                 "%24" to "$", "%2B" to "+", "%22" to "\"", "%2C" to ",",
-                "%20" to " ",
-                //css
+                "%20" to " "
+        )
+
+        @JvmStatic
+        val cssDecoder = mapOf(
                 "\\3C " to "<", "\\3E " to ">", "\\23 " to "#", "\\25 " to "%",
                 "\\7B " to "{", "\\7D " to "}", "\\7C " to "|", "\\5C " to "\\",
                 "\\5E " to "^", "\\7E " to "~", "\\5B " to "[", "\\5D " to "]",
                 "\\60 " to "`", "\\3B " to ";", "\\2F " to "/", "\\3F " to "?",
                 "\\3A " to ":", "\\40 " to "@", "\\3D " to "=", "\\26 " to "&",
                 "\\24 " to "$", "\\2B " to "+", "\\22 " to "\"", "\\2C " to ",",
-                "\\20 " to " "
+                "%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"
         )
     }
 }
\ No newline at end of file
diff --git a/app/src/test/kotlin/com/pitchedapps/frost/facebook/FbUrlTest.kt b/app/src/test/kotlin/com/pitchedapps/frost/facebook/FbUrlTest.kt
index bb6a8467..3a87a697 100644
--- a/app/src/test/kotlin/com/pitchedapps/frost/facebook/FbUrlTest.kt
+++ b/app/src/test/kotlin/com/pitchedapps/frost/facebook/FbUrlTest.kt
@@ -45,8 +45,8 @@ class FbUrlTest {
 
     @Test
     fun css() {
-        val expected = "https://test.com?efg=hi&oh=bye&oe=apple"
-        val orig = "https\\3a //test.com?efg\\3d hi\\26 oh\\3d bye\\26 oe\\3d apple"
+        val expected = "https://test.com?efg=hi&oh=bye&oe=apple%3Fornot"
+        val orig = "https\\3a //test.com?efg=hi&oh=bye&oe=apple\\3F ornot"
         assertFbFormat(expected, orig)
     }
 
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