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mastodon_vk_reposter
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Inex Code 2022-05-05 19:37:22 +00:00
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commit d3750df342
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bin/server.dart
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import 'dart:convert';
import 'dart:io';
import 'package:shelf/shelf.dart';
import 'package:shelf/shelf_io.dart';
import 'package:shelf_router/shelf_router.dart';
import 'dart:math';
import 'package:dio/dio.dart' as dio_lib;
var dio = dio_lib.Dio();
// Load confirmation token from env
final confirmationToken = Platform.environment['CONFIRMATION_TOKEN'];
// Load secret key from env
final secretKey = Platform.environment['SECRET_KEY'];
// Load mastodon instance url from env
final instanceUrl = Platform.environment['INSTANCE_URL'];
// Load mastodon auth token from env
final authToken = Platform.environment['MASTODON_TOKEN'];
// Configure routes.
final _router = Router()
..get('/', _rootHandler)
..post('/vk', _vkHandler);
Response _rootHandler(Request req) {
return Response.ok('Hello, World!\n');
}
Future<Response> _vkHandler(Request req) async {
// POST request should contain a JSON body.
// JSON must contain a 'type' field.
// The value of the 'type' field must be one of the following:
// 'confirmation'
// 'wall_post_new'
// If we recieve a 'confirmation' request, we should respond with a confirmationToken.
// If we recieve a 'wall_post_new' request, we should validate if 'secret' field equals
// secretKey and respond with an 'ok' string, printing request in the console.
final requestBody = await req.readAsString();
final requestJson = json.decode(requestBody);
final requestType = requestJson['type'];
if (requestType == 'confirmation') {
return Response.ok(confirmationToken);
} else if (requestType == 'wall_post_new') {
if (requestJson['secret'] == secretKey) {
print(requestBody);
_postOnMastodon(requestJson);
return Response.ok('ok');
} else {
return Response.ok('invalid secret');
}
} else {
return Response.ok('invalid request type');
}
}
Future<void> _postOnMastodon(reqJson) async {
// Called to repost the post on Mastodon on vk.
// reqJson contains the 'object' field of the VK post.
// This object has the 'text' field with the post text.
// Also it contains the 'attachments' field with the attachments.
// The attachments field is an array of objects.
// Each object has the 'type' field with the attachment type.
// We only want to post photos.
// The 'photo' type is 'photo'.
// The 'photo' type has the 'sizes' field with an array of objects.
// Each object has the 'url', 'height' and 'width' fields.
// We want to post the largest photo.
// The 'url' field is the url of the photo.
// The 'height' and 'width' fields are the height and width of the photo.
// We download all pictures with dio into a temporary directory.
// Make sure post text is 500 characters or less.
String postText = reqJson['object']['text'];
if (postText.length > 500) {
postText.substring(0, 500);
}
final attachments = reqJson['object']['attachments'] ?? [];
var photos = attachments.where((attachment) => attachment['type'] == 'photo');
List<String> photoUrls = [];
for (final photo in photos) {
// Find the url of the largest photo by comparing the height and width.
var largestPhoto = photo['photo']['sizes'].reduce((a, b) {
if (a['height'] * a['width'] > b['height'] * b['width']) {
return a;
} else {
return b;
}
});
final photoUrl = largestPhoto['url'];
final photoFilename =
'${DateTime.now().millisecondsSinceEpoch}-${photoUrl.split('/').last.split('?').first.substring(0, 10)}.jpg';
final photoPath = '${Directory.systemTemp.path}/$photoFilename';
await dio.download(photoUrl, photoPath);
photoUrls.add(photoPath);
}
// If there are more than four photos, move other photos to another array to be posted in the thread.
List<String> otherPhotos = [];
if (photoUrls.length > 4) {
otherPhotos = photoUrls.sublist(4);
photoUrls = photoUrls.sublist(0, 4);
}
print('photoUrls: $photoUrls');
print('otherPhotos: $otherPhotos');
// Post the post on Mastodon.
// First we upload all photos with dio.
// Then we post the post with the uploaded photos and the text.
// We delete the photos after posting.
// Photos are uploaded to POST <instanceUrl>/api/v1/media in the 'file' form data field.
// We take the 'id' field of the response and add it to the post's 'media_ids' field.
// The 'media_ids' field is an array of media ids.
// We post the post with the media ids and the text in the 'status' field.
// Endpoint: POST <instanceUrl>/api/v1/statuses
// Headers: Authorization: Bearer <authToken>
// We use auth on all requests.
// if there are no photos, we don't fetch them
if (photos.isEmpty) {
await dio.post('$instanceUrl/api/v1/statuses',
Future<void> _postOnMastodon(postText) async {
await dio.post('$instanceUrl/api/v1/statuses',
data: {'status': postText},
options:
dio_lib.Options(headers: {'Authorization': 'Bearer $authToken'}));
} else {
var mediaIds = [];
}
for (final photoUrl in photoUrls) {
final resp = await dio.post('$instanceUrl/api/v1/media',
data: dio_lib.FormData.fromMap(
{'file': dio_lib.MultipartFile.fromFileSync(photoUrl)}),
options:
dio_lib.Options(headers: {'Authorization': 'Bearer $authToken'}));
mediaIds.add(resp.data['id']);
}
/// Reads a file [fileUri] and adds posts to posts.json
///
/// If [fileUri] does not exist, do nothing.
/// [fileUri] is a plain text file where the posts are separated by empty lines.
/// posts.json is an array of posts
Future<void> _importPosts(fileUri) async {
if (!File(fileUri).existsSync()) {
return;
}
var postResponse = await dio.post('$instanceUrl/api/v1/statuses',
data: {'status': postText, 'media_ids': mediaIds},
options:
dio_lib.Options(headers: {'Authorization': 'Bearer $authToken'}));
final file = File(fileUri);
final lines = await file.readAsLines();
await Future.wait(photoUrls.map((photoUrl) => File(photoUrl).delete()));
final List<String> posts = [];
String post = '';
// If there are other photos, post them in a thread.
while (otherPhotos.isNotEmpty) {
mediaIds = [];
if (otherPhotos.length > 4) {
otherPhotos = photoUrls.sublist(4);
photoUrls = photoUrls.sublist(0, 4);
} else {
photoUrls = otherPhotos;
otherPhotos = [];
}
print('photoUrls: $photoUrls');
print('otherPhotos: $otherPhotos');
for (final photoUrl in photoUrls) {
final resp = await dio.post('$instanceUrl/api/v1/media',
data: dio_lib.FormData.fromMap(
{'file': dio_lib.MultipartFile.fromFileSync(photoUrl)}),
options: dio_lib.Options(
headers: {'Authorization': 'Bearer $authToken'}));
mediaIds.add(resp.data['id']);
}
postResponse = await dio.post('$instanceUrl/api/v1/statuses',
data: {
'in_reply_to_id': postResponse.data['id'],
'media_ids': mediaIds
},
options:
dio_lib.Options(headers: {'Authorization': 'Bearer $authToken'}));
await Future.wait(photoUrls.map((photoUrl) => File(photoUrl).delete()));
for (final line in lines) {
if (line.isEmpty && post != '') {
posts.add(post);
} else {
post += '$line\n';
}
}
if (post != '') {
posts.add(post);
}
// Read posts.json and add posts to it
final postsJson = json.decode(await File('posts.json').readAsString()) as List<String>;
postsJson.addAll(posts);
// Write posts.json
await File('posts.json').writeAsString(json.encode(postsJson));
// Delete file
await file.delete();
return;
}
/// Posts a random string from posts.json to mastodon
///
/// If posts.json does not exist, do nothing.
/// posts.json is an array of posts
/// If an array is empty, do nothing.
/// Delete posted post from posts.json
Future<void> _postRandomPost() async {
if (!File('posts.json').existsSync()) {
return;
}
final postsJson = json.decode(await File('posts.json').readAsString()) as List<String>;
if (postsJson.isEmpty) {
return;
}
final post = postsJson.removeAt(Random().nextInt(postsJson.length));
await File('posts.json').writeAsString(json.encode(postsJson));
await _postOnMastodon(post);
return;
}
void main(List<String> args) async {
// Use any available host or container IP (usually `0.0.0.0`).
final ip = InternetAddress.anyIPv4;
// If posts.json does not exist, create it and write an empty array
if (!File('posts.json').existsSync()) {
await File('posts.json').writeAsString(json.encode([]));
}
// Configure a pipeline that logs requests.
final _handler = Pipeline().addMiddleware(logRequests()).addHandler(_router);
// Import posts from files
await _importPosts('/posts.txt');
// For running in containers, we respect the PORT environment variable.
final port = int.parse(Platform.environment['PORT'] ?? '8080');
final server = await serve(_handler, ip, port);
print('Server listening on port ${server.port}');
// Post a random post
await _postRandomPost();
// Post a random post at random time
// Random time is between 1 and 8 hours
// Random time is choosen after every post
while (true) {
await Future.delayed(Duration(hours: Random().nextInt(8) + 1));
await _postRandomPost();
}
}