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bin/server.dart
257
bin/server.dart
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import 'dart:convert';
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import 'dart:io';
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import 'package:shelf/shelf.dart';
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import 'package:shelf/shelf_io.dart';
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import 'package:shelf_router/shelf_router.dart';
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import 'dart:math';
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import 'package:dio/dio.dart' as dio_lib;
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var dio = dio_lib.Dio();
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// Load confirmation token from env
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final confirmationToken = Platform.environment['CONFIRMATION_TOKEN'];
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// Load secret key from env
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final secretKey = Platform.environment['SECRET_KEY'];
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// Load mastodon instance url from env
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final instanceUrl = Platform.environment['INSTANCE_URL'];
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// Load mastodon auth token from env
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final authToken = Platform.environment['MASTODON_TOKEN'];
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// Configure routes.
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final _router = Router()
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..get('/', _rootHandler)
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..post('/vk', _vkHandler);
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Response _rootHandler(Request req) {
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return Response.ok('Hello, World!\n');
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}
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Future<Response> _vkHandler(Request req) async {
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// POST request should contain a JSON body.
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// JSON must contain a 'type' field.
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// The value of the 'type' field must be one of the following:
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// 'confirmation'
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// 'wall_post_new'
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// If we recieve a 'confirmation' request, we should respond with a confirmationToken.
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// If we recieve a 'wall_post_new' request, we should validate if 'secret' field equals
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// secretKey and respond with an 'ok' string, printing request in the console.
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final requestBody = await req.readAsString();
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final requestJson = json.decode(requestBody);
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final requestType = requestJson['type'];
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if (requestType == 'confirmation') {
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return Response.ok(confirmationToken);
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} else if (requestType == 'wall_post_new') {
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if (requestJson['secret'] == secretKey) {
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print(requestBody);
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_postOnMastodon(requestJson);
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return Response.ok('ok');
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} else {
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return Response.ok('invalid secret');
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}
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} else {
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return Response.ok('invalid request type');
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}
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}
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Future<void> _postOnMastodon(reqJson) async {
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// Called to repost the post on Mastodon on vk.
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// reqJson contains the 'object' field of the VK post.
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// This object has the 'text' field with the post text.
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// Also it contains the 'attachments' field with the attachments.
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// The attachments field is an array of objects.
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// Each object has the 'type' field with the attachment type.
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// We only want to post photos.
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// The 'photo' type is 'photo'.
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// The 'photo' type has the 'sizes' field with an array of objects.
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// Each object has the 'url', 'height' and 'width' fields.
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// We want to post the largest photo.
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// The 'url' field is the url of the photo.
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// The 'height' and 'width' fields are the height and width of the photo.
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// We download all pictures with dio into a temporary directory.
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// Make sure post text is 500 characters or less.
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String postText = reqJson['object']['text'];
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if (postText.length > 500) {
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postText.substring(0, 500);
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}
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final attachments = reqJson['object']['attachments'] ?? [];
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var photos = attachments.where((attachment) => attachment['type'] == 'photo');
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List<String> photoUrls = [];
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for (final photo in photos) {
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// Find the url of the largest photo by comparing the height and width.
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var largestPhoto = photo['photo']['sizes'].reduce((a, b) {
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if (a['height'] * a['width'] > b['height'] * b['width']) {
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return a;
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} else {
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return b;
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}
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});
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final photoUrl = largestPhoto['url'];
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final photoFilename =
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'${DateTime.now().millisecondsSinceEpoch}-${photoUrl.split('/').last.split('?').first.substring(0, 10)}.jpg';
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final photoPath = '${Directory.systemTemp.path}/$photoFilename';
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await dio.download(photoUrl, photoPath);
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photoUrls.add(photoPath);
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}
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// If there are more than four photos, move other photos to another array to be posted in the thread.
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List<String> otherPhotos = [];
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if (photoUrls.length > 4) {
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otherPhotos = photoUrls.sublist(4);
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photoUrls = photoUrls.sublist(0, 4);
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}
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print('photoUrls: $photoUrls');
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print('otherPhotos: $otherPhotos');
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// Post the post on Mastodon.
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// First we upload all photos with dio.
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// Then we post the post with the uploaded photos and the text.
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// We delete the photos after posting.
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// Photos are uploaded to POST <instanceUrl>/api/v1/media in the 'file' form data field.
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// We take the 'id' field of the response and add it to the post's 'media_ids' field.
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// The 'media_ids' field is an array of media ids.
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// We post the post with the media ids and the text in the 'status' field.
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// Endpoint: POST <instanceUrl>/api/v1/statuses
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// Headers: Authorization: Bearer <authToken>
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// We use auth on all requests.
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// if there are no photos, we don't fetch them
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if (photos.isEmpty) {
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Future<void> _postOnMastodon(postText) async {
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await dio.post('$instanceUrl/api/v1/statuses',
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data: {'status': postText},
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options:
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dio_lib.Options(headers: {'Authorization': 'Bearer $authToken'}));
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}
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/// Reads a file [fileUri] and adds posts to posts.json
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///
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/// If [fileUri] does not exist, do nothing.
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/// [fileUri] is a plain text file where the posts are separated by empty lines.
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/// posts.json is an array of posts
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Future<void> _importPosts(fileUri) async {
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if (!File(fileUri).existsSync()) {
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return;
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}
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final file = File(fileUri);
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final lines = await file.readAsLines();
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final List<String> posts = [];
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String post = '';
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for (final line in lines) {
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if (line.isEmpty && post != '') {
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posts.add(post);
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} else {
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var mediaIds = [];
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for (final photoUrl in photoUrls) {
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final resp = await dio.post('$instanceUrl/api/v1/media',
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data: dio_lib.FormData.fromMap(
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{'file': dio_lib.MultipartFile.fromFileSync(photoUrl)}),
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options:
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dio_lib.Options(headers: {'Authorization': 'Bearer $authToken'}));
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mediaIds.add(resp.data['id']);
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}
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var postResponse = await dio.post('$instanceUrl/api/v1/statuses',
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data: {'status': postText, 'media_ids': mediaIds},
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options:
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dio_lib.Options(headers: {'Authorization': 'Bearer $authToken'}));
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await Future.wait(photoUrls.map((photoUrl) => File(photoUrl).delete()));
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// If there are other photos, post them in a thread.
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while (otherPhotos.isNotEmpty) {
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mediaIds = [];
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if (otherPhotos.length > 4) {
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otherPhotos = photoUrls.sublist(4);
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photoUrls = photoUrls.sublist(0, 4);
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} else {
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photoUrls = otherPhotos;
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otherPhotos = [];
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}
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print('photoUrls: $photoUrls');
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print('otherPhotos: $otherPhotos');
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for (final photoUrl in photoUrls) {
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final resp = await dio.post('$instanceUrl/api/v1/media',
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data: dio_lib.FormData.fromMap(
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{'file': dio_lib.MultipartFile.fromFileSync(photoUrl)}),
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options: dio_lib.Options(
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headers: {'Authorization': 'Bearer $authToken'}));
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mediaIds.add(resp.data['id']);
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}
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postResponse = await dio.post('$instanceUrl/api/v1/statuses',
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data: {
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'in_reply_to_id': postResponse.data['id'],
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'media_ids': mediaIds
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},
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options:
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dio_lib.Options(headers: {'Authorization': 'Bearer $authToken'}));
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await Future.wait(photoUrls.map((photoUrl) => File(photoUrl).delete()));
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post += '$line\n';
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}
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}
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if (post != '') {
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posts.add(post);
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}
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// Read posts.json and add posts to it
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final postsJson = json.decode(await File('posts.json').readAsString()) as List<String>;
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postsJson.addAll(posts);
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// Write posts.json
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await File('posts.json').writeAsString(json.encode(postsJson));
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// Delete file
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await file.delete();
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return;
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}
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/// Posts a random string from posts.json to mastodon
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///
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/// If posts.json does not exist, do nothing.
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/// posts.json is an array of posts
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/// If an array is empty, do nothing.
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/// Delete posted post from posts.json
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Future<void> _postRandomPost() async {
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if (!File('posts.json').existsSync()) {
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return;
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}
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final postsJson = json.decode(await File('posts.json').readAsString()) as List<String>;
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if (postsJson.isEmpty) {
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return;
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}
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final post = postsJson.removeAt(Random().nextInt(postsJson.length));
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await File('posts.json').writeAsString(json.encode(postsJson));
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await _postOnMastodon(post);
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return;
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}
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void main(List<String> args) async {
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// Use any available host or container IP (usually `0.0.0.0`).
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final ip = InternetAddress.anyIPv4;
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// If posts.json does not exist, create it and write an empty array
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if (!File('posts.json').existsSync()) {
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await File('posts.json').writeAsString(json.encode([]));
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}
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// Configure a pipeline that logs requests.
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final _handler = Pipeline().addMiddleware(logRequests()).addHandler(_router);
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// Import posts from files
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await _importPosts('/posts.txt');
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// Post a random post
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await _postRandomPost();
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// Post a random post at random time
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// Random time is between 1 and 8 hours
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// Random time is choosen after every post
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while (true) {
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await Future.delayed(Duration(hours: Random().nextInt(8) + 1));
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await _postRandomPost();
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}
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// For running in containers, we respect the PORT environment variable.
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final port = int.parse(Platform.environment['PORT'] ?? '8080');
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final server = await serve(_handler, ip, port);
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print('Server listening on port ${server.port}');
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}
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