Improve webplayer UX

htdocs/api/common.php

@@ -0,0 +1,29 @@
+<?php
+
+function execAndEcho($command) {
+    $output = execScript($command);
+    echo(implode('\n', $output));
+}
+
+function execScript($command) {
+    $absoluteCommand = realpath(dirname(__FILE__) .'/../../scripts') ."/{$command}";
+    return execSuccessfully($absoluteCommand);
+}
+
+function execScriptWithoutCheck($command) {
+    $absoluteCommand = realpath(dirname(__FILE__) .'/../../scripts') ."/{$command}";
+    exec($absoluteCommand);
+}
+
+function execSuccessfully($command) {
+    exec($command, $output, $rc);
+    if ($rc != 0) {
+        $formattedOutput = implode('\n', $output);
+        echo "Execution failed\nCommand: {$command}\nOutput: {$formattedOutput}\nRC: .${rc}";
+        http_response_code(500);
+        exit();
+    }
+    return $output;
+}
+
+?>

htdocs/api/cover.php

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+<?php
+/**
+ * Returns the cover of the currently played folder.
+ */
+
+$Audio_Folders_Path = trim(file_get_contents('../../settings/Audio_Folders_Path'));
+$Latest_Folder_Played = trim(file_get_contents('../../settings/Latest_Folder_Played'));
+
+$spover = $Audio_Folders_Path."/../../settings/cover.jpg";
+$ocover = $Audio_Folders_Path."/".$Latest_Folder_Played."/cover.jpg";
+$nocover = "../_assets/img/No_Cover.jpg";
+
+if(file_exists($Audio_Folders_Path.'/'.$Latest_Folder_Played.'/cover.jpg')) {
+    $filename = $ocover;
+} elseif (file_exists($Audio_Folders_Path.'/'.$Latest_Folder_Played.'/spotify.txt')) {
+    $filename = $spover;
+} else {
+    $filename = $nocover;
+}
+
+header("Content-Type: image/jpeg");
+header("Content-Length: " . filesize($filename));
+header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
+header("Cache-Control: post-check=0, pre-check=0", false);
+header("Pragma: no-cache");
+
+$fp = fopen($filename, 'rb');
+fpassthru($fp);
+
+?>

htdocs/api/latest.php

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+<?php
+/**
+ * Returns the latest played file, folder and playlist.
+ */
+
+$result = array();
+$result['folder'] = trim(file_get_contents('../../settings/Latest_Folder_Played'));
+$result['file'] = trim(file_get_contents('../../settings/Latest_Played_File'));
+$result['playlist'] = trim(file_get_contents('../../settings/Latest_Playlist_Played'));
+echo json_encode($result, JSON_PRETTY_PRINT);
+
+header('Content-Type: application/json');
+?>

htdocs/api/player.php

@@ -0,0 +1,81 @@
+<?php
+
+/***
+ * Allows to control the player by sending a command via PUT like 'play' or 'pause'.
+ * Retrieves information about the player by sending a GET request.
+ */
+include 'common.php';
+
+if ($_SERVER['REQUEST_METHOD'] === 'PUT') {
+    handlePut();
+} else if ($_SERVER['REQUEST_METHOD'] === 'GET') {
+    handleGet();
+} else {
+    http_response_code(405);
+}
+
+function handlePut() {
+    $body = file_get_contents('php://input');
+    $json = json_decode(trim($body), TRUE);
+    $inputCommand = $json['command'];
+    if ($inputCommand != null) {
+        $controlsCommand = determineCommand($inputCommand);
+        $execCommand = "playout_controls.sh {$controlsCommand}";
+        execScript($execCommand);
+    } else {
+        echo "Body is missing command";
+        http_response_code(400);
+    }
+}
+
+function handleGet() {
+    $statusCommand = "echo 'status\ncurrentsong\nclose' | nc -w 1 localhost 6600";
+    $execResult = execSuccessfully($statusCommand);
+    $result = array();
+    forEach($execResult as $value) {
+        $exploded = explode(' ', $value);
+        if (count($exploded) == 2) {
+            $result[substr(trim($exploded[0]), 0, -1)] = $exploded[1];
+        }
+    }
+    header('Content-Type: application/json');
+    echo json_encode($result);
+}
+
+function determineCommand($body) {
+    switch ($body) {
+        case 'play':
+            return '-c=playerplay';
+        case 'next':
+            return '-c=playernext';
+        case 'prev':
+            return '-c=playerprev';
+        case 'replay':
+            return '-c=playerreplay -v=playlist';
+        case 'pause':
+            return '-c=playerpause -v=single';
+        case 'repeat':
+            return '-c=playerprev -c=playerrepeat -v=playlist';
+        case 'single':
+            return '-c=playerprev -c=playerrepeat -v=single';
+        case 'repeatoff':
+            return '-c=playerprev -c=playerrepeat -v=off';
+        case 'seekBack':
+            return '-c=playerprev -c=playerseek -v=-15';
+        case 'seekAhead':
+            return '-c=playerprev -c=playerseek -v=+15';
+        case 'stop':
+            return '-c=playerstop';
+        case 'mute':
+            return'-c=mute';
+        case 'volumeup':
+            return'-c=volumeup';
+        case 'volumedown':
+            return'-c=volumedown';
+    }
+    echo "Unknown command {$body}";
+    http_response_code(400);
+    exit;
+}
+
+?>