From 8ec833f8087b0bba2f167471c430543c271602dc Mon Sep 17 00:00:00 2001
From: Michael Vogel <icarus@dabo.de>
Date: Mon, 22 Feb 2016 23:20:59 +0100
Subject: [PATCH] New BBCode element "abstract" for network depending messages.

---
 include/bbcode.php    | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/dfrn.php      |  4 ++++
 include/plaintext.php | 43 ++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 88 insertions(+), 1 deletion(-)

diff --git a/include/bbcode.php b/include/bbcode.php
index 6a44e19ec..eb009477c 100644
--- a/include/bbcode.php
+++ b/include/bbcode.php
@@ -851,6 +851,9 @@ function bbcode($Text,$preserve_nl = false, $tryoembed = true, $simplehtml = fal
 
 	$a = get_app();
 
+	// Remove the abstract element. It is a non visible element.
+	$Text = remove_abstract($Text);
+
 	// Hide all [noparse] contained bbtags by spacefying them
 	// POSSIBLE BUG --> Will the 'preg' functions crash if there's an embedded image?
 
@@ -1300,4 +1303,43 @@ function bbcode($Text,$preserve_nl = false, $tryoembed = true, $simplehtml = fal
 
 	return trim($Text);
 }
+
+/**
+ * @brief Removes the "abstract" element from the text
+ *
+ * @param string $text The text with BBCode
+ * @return string The same text - but without "abstract" element
+ */
+function remove_abstract($text) {
+	$text = preg_replace("/[\s|\n]*\[abstract\].*?\[\/abstract\][\s|\n]*/ism", '', $text);
+	$text = preg_replace("/[\s|\n]*\[abstract=.*?\].*?\[\/abstract][\s|\n]*/ism", '', $text);
+
+	return $text;
+}
+
+/**
+ * @brief Returns the value of the "abstract" element
+ *
+ * @param string $text The text that maybe contains the element
+ * @param string $addon The addon for which the abstract is meant for
+ * @return string The abstract
+ */
+function fetch_abstract($text, $addon = "") {
+	$abstract = "";
+	$abstracts = array();
+	$addon = strtolower($addon);
+
+	if (preg_match_all("/\[abstract=(.*?)\](.*?)\[\/abstract\]/ism",$text, $results, PREG_SET_ORDER))
+		foreach ($results AS $result)
+			$abstracts[strtolower($result[1])] = $result[2];
+
+	if (isset($abstracts[$addon]))
+		$abstract = $abstracts[$addon];
+
+	if ($abstract == "")
+		if (preg_match("/\[abstract\](.*?)\[\/abstract\]/ism",$text, $result))
+			$abstract = $result[1];
+
+	return $abstract;
+}
 ?>
diff --git a/include/dfrn.php b/include/dfrn.php
index f7a05bdb6..ad04a9129 100644
--- a/include/dfrn.php
+++ b/include/dfrn.php
@@ -18,6 +18,7 @@ require_once("include/event.php");
 require_once("include/text.php");
 require_once("include/oembed.php");
 require_once("include/html2bbcode.php");
+require_once("include/bbcode.php");
 
 /**
  * @brief This class contain functions to create and send DFRN XML files
@@ -720,6 +721,9 @@ class dfrn {
 		else
 			$body = $item['body'];
 
+		// Remove the abstract element. It is only locally important.
+		$body = remove_abstract($body);
+
 		if ($type == 'html') {
 			$htmlbody = $body;
 
diff --git a/include/plaintext.php b/include/plaintext.php
index 05431bee2..199abcbb3 100644
--- a/include/plaintext.php
+++ b/include/plaintext.php
@@ -132,7 +132,7 @@ function shortenmsg($msg, $limit, $twitter = false) {
 	return($msg);
 }
 
-function plaintext($a, $b, $limit = 0, $includedlinks = false, $htmlmode = 2) {
+function plaintext($a, $b, $limit = 0, $includedlinks = false, $htmlmode = 2, $target_network = "") {
 	require_once("include/bbcode.php");
 	require_once("include/html2plain.php");
 	require_once("include/network.php");
@@ -144,6 +144,9 @@ function plaintext($a, $b, $limit = 0, $includedlinks = false, $htmlmode = 2) {
 	// Add an URL element if the text contains a raw link
 	$body = preg_replace("/([^\]\='".'"'."]|^)(https?\:\/\/[a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", '$1[url]$2[/url]', $body);
 
+	// Remove the abstract
+	$body = remove_abstract($body);
+
 	// At first look at data that is attached via "type-..." stuff
 	// This will hopefully replaced with a dedicated bbcode later
 	//$post = get_attached_data($b["body"]);
@@ -154,6 +157,44 @@ function plaintext($a, $b, $limit = 0, $includedlinks = false, $htmlmode = 2) {
 	elseif ($b["title"] != "")
 		$post["text"] = trim($b["title"]);
 
+	$abstract = "";
+
+	// Fetch the abstract from the given target network
+	if ($target_network != "") {
+		$default_abstract = fetch_abstract($b["body"]);
+		$abstract = fetch_abstract($b["body"], $target_network);
+
+		// If we post to a network with no limit we only fetch
+		// an abstract exactly for this network
+		if (($limit == 0) AND ($abstract == $default_abstract))
+			$abstract = "";
+
+	} else // Try to guess the correct target network
+		switch ($htmlmode) {
+			case 8:
+				$abstract = fetch_abstract($b["body"], NETWORK_TWITTER);
+				break;
+			case 7:
+				$abstract = fetch_abstract($b["body"], NETWORK_STATUSNET);
+				break;
+			case 6:
+				$abstract = fetch_abstract($b["body"], NETWORK_APPNET);
+				break;
+			default: // We don't know the exact target.
+				 // We fetch an abstract since there is a posting limit.
+				if ($limit > 0)
+					$abstract = fetch_abstract($b["body"]);
+		}
+
+	if ($abstract != "") {
+		$post["text"] = $abstract;
+
+		if ($post["type"] == "text") {
+			$post["type"] = "link";
+			$post["url"] = $b["plink"];
+		}
+	}
+
 	$html = bbcode($post["text"], false, false, $htmlmode);
 	$msg = html2plain($html, 0, true);
 	$msg = trim(html_entity_decode($msg,ENT_QUOTES,'UTF-8'));