hopefully unify handling of server HTTPS variables where needed, use scheme based on SELF_URL_PATH otherwise

include/functions.php

@@ -1528,7 +1528,6 @@
 		$doc->loadHTML($charset_hack . $res);
 		$xpath = new DOMXPath($doc);
 
-		$ttrss_uses_https = parse_url(get_self_url_prefix(), PHP_URL_SCHEME) === 'https';
 		$rewrite_base_url = $site_url ? $site_url : get_self_url_prefix();
 
 		$entries = $xpath->query('(//a[@href]|//img[@src]|//video/source[@src]|//audio/source[@src])');
@@ -1578,7 +1577,7 @@
 				if ($entry->hasAttribute('src')) {
 					$is_https_url = parse_url($entry->getAttribute('src'), PHP_URL_SCHEME) === 'https';
 
-					if ($ttrss_uses_https && !$is_https_url) {
+					if (is_prefix_https() && !$is_https_url) {
 
 						if ($entry->hasAttribute('srcset')) {
 							$entry->removeAttribute('srcset');
@@ -1619,7 +1618,7 @@
 			if (!iframe_whitelisted($entry)) {
 				$entry->setAttribute('sandbox', 'allow-scripts');
 			} else {
-				if ($_SERVER['HTTPS'] == "on") {
+				if (is_prefix_https()) {
 					$entry->setAttribute("src",
 						str_replace("http://", "https://",
 							$entry->getAttribute("src")));
@@ -1782,6 +1781,14 @@
 		return $tag;
 	}
 
+	function is_server_https() {
+		return $_SERVER['HTTPS'] == 'on' || $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https';
+	}
+
+	function is_prefix_https() {
+		return parse_url(SELF_URL_PATH, PHP_URL_SCHEME) == 'https';
+	}
+
 	// this returns SELF_URL_PATH sans ending slash
 	function get_self_url_prefix() {
 		if (strrpos(SELF_URL_PATH, "/") === strlen(SELF_URL_PATH)-1) {

include/sanity_check.php

@@ -15,7 +15,7 @@
 	 * to get out. */
 
 	function make_self_url_path() {
-		$proto = ($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') ? 'https' : 'http';
+		$proto = is_server_https() ? 'https' : 'http';
 		$url_path = $proto . '://' . $_SERVER["HTTP_HOST"] . parse_url($_SERVER["REQUEST_URI"], PHP_URL_PATH);
 
 		return $url_path;
@@ -152,12 +152,6 @@
 			if (!class_exists("DOMDocument")) {
 				array_push($errors, "PHP support for DOMDocument is required, but was not found.");
 			}
-
-			$self_scheme = parse_url(SELF_URL_PATH, PHP_URL_SCHEME);
-
-			if ($_SERVER['HTTPS'] && $self_scheme == 'http') {
-				array_push($errors, "You are accessing tt-rss over SSL but SELF_URL_PATH in config.php refers to a http:// URL.");
-			}
 		}
 
 		if (count($errors) > 0 && $_SERVER['REQUEST_URI']) { ?>

install/index.php

@@ -179,8 +179,12 @@
 		}
 	}
 
+	function is_server_https() {
+		return $_SERVER['HTTPS'] == 'on' || $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https';
+	}
+
 	function make_self_url_path() {
-		$url_path = ((!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on") ? 'http://' :  'https://') . $_SERVER["HTTP_HOST"] . parse_url($_SERVER["REQUEST_URI"], PHP_URL_PATH);
+		$url_path = (is_server_https() ? 'https://' :  'http://') . $_SERVER["HTTP_HOST"] . parse_url($_SERVER["REQUEST_URI"], PHP_URL_PATH);
 
 		return $url_path;
 	}