af_redditimgur: add crude dupe checking based on content links

plugins/af_redditimgur/init.php

@@ -23,6 +23,9 @@ class Af_RedditImgur extends Plugin {
 		$enable_readability = $this->host->get($this, "enable_readability");
 		$enable_readability_checked = $enable_readability ? "checked" : "";
 
+		$enable_dupecheck = $this->host->get($this, "enable_dupecheck");
+		$enable_dupecheck_checked = $enable_dupecheck ? "checked" : "";
+		
 		print "<form dojoType=\"dijit.form.Form\">";
 
 		print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
@@ -53,6 +56,13 @@ class Af_RedditImgur extends Plugin {
 
 		print "<label for=\"enable_readability\">" . __("Extract missing content using Readability") . "</label>";
 
+		print "<br/>";
+		
+		print "<input dojoType=\"dijit.form.CheckBox\" id=\"enable_dupecheck\"
+			$enable_dupecheck_checked name=\"enable_dupecheck\">&nbsp;";
+
+		print "<label for=\"enable_dupecheck\">" . __("Mark duplicates as read using content links") . "</label>";
+		
 		print "<p><button dojoType=\"dijit.form.Button\" type=\"submit\">".
 			__("Save")."</button>";
 
@@ -63,8 +73,10 @@ class Af_RedditImgur extends Plugin {
 
 	function save() {
 		$enable_readability = checkbox_to_sql_bool($_POST["enable_readability"]) == "true";
+		$enable_dupecheck = checkbox_to_sql_bool($_POST["enable_dupecheck"]) == "true";
 		
 		$this->host->set($this, "enable_readability", $enable_readability);
+		$this->host->set($this, "enable_dupecheck", $enable_dupecheck);
 
 		echo __("Configuration saved");
 	}
@@ -228,15 +240,42 @@ class Af_RedditImgur extends Plugin {
 			@$doc->loadHTML($article["content"]);
 			$xpath = new DOMXPath($doc);
 
-			$found = $this->inline_stuff($article, $doc, $xpath);
+			$content_link = $xpath->query("(//a[contains(., '[link]')])")->item(0);
+
+			if ($content_link && $this->host->get($this, "enable_dupecheck")) {
+
+				if (DB_TYPE == "pgsql") {
+					$date_qpart = "date_entered < NOW() - INTERVAL '1 day' ";
+				} else {
+					$date_qpart = "date_entered < DATE_SUB(NOW(), INTERVAL 1 DAY) ";
+				}
+
+				$content_href = db_escape_string($content_link->getAttribute("href"));
+				$owner_uid = $article["owner_uid"];
+				$guid = db_escape_string($article["guid_hashed"]);
+
+				$result = db_query("SELECT id FROM ttrss_entries, ttrss_user_entries
+					WHERE
+						content LIKE '%$content_href%' AND
+						$date_qpart AND
+						ref_id = id AND
+						owner_uid = $owner_uid
+						AND guid != '$guid'
+					LIMIT 1");
+
+				if (db_num_rows($result) != 0) {
+					$found = true;
+					$article["force_catchup"] = true;
+				}
+			}
+
+			if (!$found) $found = $this->inline_stuff($article, $doc, $xpath);
 
 			if (function_exists("curl_init") && !$found && $this->host->get($this, "enable_readability") &&
 				mb_strlen(strip_tags($article["content"])) <= 150) {
 
 				if (!class_exists("Readability")) require_once(dirname(dirname(__DIR__)). "/lib/readability/Readability.php");
 
-				$content_link = $xpath->query("(//a[contains(., '[link]')])")->item(0);
-
 				if ($content_link &&
 					strpos($content_link->getAttribute("href"), "twitter.com") === FALSE &&
 					strpos($content_link->getAttribute("href"), "youtube.com") === FALSE &&