From 9a607a3906c584ef0a51a6002f1d93645df4c4b7 Mon Sep 17 00:00:00 2001
From: Benjamin Loison <12752145+Benjamin-Loison@users.noreply.github.com>
Date: Sun, 31 Mar 2024 22:20:20 +0200
Subject: [PATCH] Add Protobuf dependency and authentication to retrieve
 community post poll vote details

[As requested on Discord](https://discord.com/channels/933841502155706418/933841503103627316/1222103337105883177).
---
 README.md     | 32 +++++++++++++++++++++++-
 common.php    |  4 +++
 community.php | 68 +++++++++++++++++++++++++++++++++++++++++++++++----
 index.php     |  1 +
 4 files changed, 99 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 3917f11..a54205c 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,37 @@ brew services start httpd
 git clone https://github.com/Benjamin-Loison/YouTube-operational-API
 ```
 
-4. Verify that your API instance is reachable by trying to access:
+4. Install Protobuf dependency:
+
+### On Linux (Ubuntu, Debian and Mint):
+
+```sh
+sudo apt install composer
+```
+
+### On Windows:
+
+TODO
+
+### On MacOS:
+
+```sh
+brew install composer
+```
+
+In `YouTube-operational-API/` clone folder:
+
+```sh
+composer require google/protobuf
+```
+
+Generate code of PHP objects from `.proto` prototypes:
+
+```sh
+protoc --php_out=proto/php/ --proto_path=proto/prototypes/ $(find proto/prototypes/ -type f)
+```
+
+5. Verify that your API instance is reachable by trying to access:
 
 - On Linux and Windows: http://localhost/YouTube-operational-API/
 - On MacOS: http://localhost:8080/YouTube-operational-API/
diff --git a/common.php b/common.php
index c1cfc0f..d74359b 100644
--- a/common.php
+++ b/common.php
@@ -373,6 +373,7 @@ function getCommunityPostFromContent($content)
             foreach ($pollRenderer['choices'] as $choice) {
                 $returnedChoice = $choice['text']['runs'][0];
                 $returnedChoice['image'] = $choice['image'];
+                $returnedChoice['voteRatio'] = $choice['voteRatioIfNotSelected'];
                 array_push($choices, $returnedChoice);
             }
             $totalVotesStr = $pollRenderer['totalVotes']['simpleText'];
@@ -394,6 +395,9 @@ function getCommunityPostFromContent($content)
         $post = [
             'id' => $id,
             'channelId' => $channelId,
+            'channelName' => $common['authorText']['runs'][0]['text'],
+            'channelHandle' => substr($common['authorEndpoint']['browseEndpoint']['canonicalBaseUrl'], 1),
+            'channelThumbnails' => $common['authorThumbnail']['thumbnails'],
             'date' => $date,
             'contentText' => $contentText,
             'likes' => $likes,
diff --git a/community.php b/community.php
index f16e44a..c85371f 100644
--- a/community.php
+++ b/community.php
@@ -2,6 +2,13 @@
 
 header('Content-Type: application/json; charset=UTF-8');
 
+require_once __DIR__ . '/vendor/autoload.php';
+
+include_once 'proto/php/Browse.php';
+include_once 'proto/php/GPBMetadata/Browse.php';
+include_once 'proto/php/SubBrowse.php';
+include_once 'proto/php/GPBMetadata/SubBrowse.php';
+
 include_once 'common.php';
 
 $realOptions = [
@@ -12,7 +19,7 @@
     $options[$realOption] = false;
 }
 
-if (isset($_GET['part'], $_GET['id'])) {
+if (isset($_GET['part'], $_GET['id'], $_GET['channelId'])) {
     $part = $_GET['part'];
     $parts = explode(',', $part, count($realOptions));
     foreach ($parts as $part) {
@@ -28,20 +35,71 @@
         dieWithJsonMessage('Invalid postId');
     }
 
+    $channelId = $_GET['channelId'];
+    if (!isChannelId($channelId)) {
+        dieWithJsonMessage('Invalid channelId');
+    }
+
     $order = isset($_GET['order']) ? $_GET['order'] : 'relevance';
     if (!in_array($order, ['relevance', 'time'])) {
         dieWithJsonMessage('Invalid order');
     }
 
-    echo getAPI($postId, $order);
+    echo getAPI($postId, $channelId, $order);
 } else if(!test()) {
     dieWithJsonMessage('Required parameters not provided');
 }
 
-function getAPI($postId, $order)
+function implodeArray($anArray, $separator)
+{
+    return array_map(fn($k, $v) => "${k}${separator}${v}", array_keys($anArray), array_values($anArray));
+}
+
+function getAPI($postId, $channelId, $order)
 {
-    $result = getJSONFromHTMLForcingLanguage("https://www.youtube.com/post/$postId");
-    $contents = getTabs($result)[0]['tabRenderer']['content']['sectionListRenderer']['contents'];
+    $currentTime = time();
+    $SAPISID = 'CENSORED';
+    $__Secure_3PSID = 'CENSORED';
+    $ORIGIN = 'https://www.youtube.com';
+    $SAPISIDHASH = "${currentTime}_" . sha1("$currentTime $SAPISID $ORIGIN");
+
+    $subBrowse = new \SubBrowse();
+    $subBrowse->setPostId($postId);
+
+    $browse = new \Browse();
+    $browse->setEndpoint('community');
+    $browse->setSubBrowse($subBrowse);
+
+    $params = base64_encode($browse->serializeToString());
+
+    $rawData = [
+        'context' => [
+            'client' => [
+                'clientName' => 'WEB',
+                'clientVersion' => MUSIC_VERSION
+            ]
+        ],
+        'browseId' => $channelId,
+        'params' => $params,
+    ];
+
+    $opts = [
+        'http' => [
+            'method' => 'POST',
+            'header' => implodeArray([
+                'Content-Type' => 'application/json',
+                'Origin' => $ORIGIN,
+                'Authorization' => "SAPISIDHASH $SAPISIDHASH",
+                'Cookie' => implode('; ', implodeArray([
+                    '__Secure-3PSID' => $__Secure_3PSID,
+                    '__Secure-3PAPISID' => $SAPISID,
+                ], '=')),
+            ], ': '),
+            'content' => json_encode($rawData),
+        ]
+    ];
+    $result = getJSON('https://www.youtube.com/youtubei/v1/browse', $opts);
+    $contents = getTabByName($result, 'Community')['tabRenderer']['content']['sectionListRenderer']['contents'];
     $content = $contents[0]['itemSectionRenderer']['contents'][0];
     $post = getCommunityPostFromContent($content);
     $continuationToken = urldecode($contents[1]['itemSectionRenderer']['contents'][0]['continuationItemRenderer']['continuationEndpoint']['continuationCommand']['token']);
diff --git a/index.php b/index.php
index 6259937..c431d4e 100644
--- a/index.php
+++ b/index.php
@@ -209,6 +209,7 @@ function feature($feature)
                     'snippet',
                 ],
                 'id' => 'POST_ID',
+                'channelId' => 'CHANNEL_ID',
                 'order' => [
                     'relevance',
                     'time',