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# frozen_string_literal: true
class Services::Twitter < Service
include Rails.application.routes.url_helpers
MAX_CHARACTERS = 140
SHORTENED_URL_LENGTH = 21
LINK_PATTERN = %r{https?://\S+}
def provider
"twitter"
end
def post post, url=''
logger.debug "event=post_to_service type=twitter sender_id=#{user_id} post=#{post.guid}"
tweet = attempt_post post
post.tweet_id = tweet.id
post.save
end
def profile_photo_url
client.user(nickname).profile_image_url_https "original"
end
def post_opts(post)
{tweet_id: post.tweet_id} if post.tweet_id.present?
end
def delete_from_service(opts)
logger.debug "event=delete_from_service type=twitter sender_id=#{user_id} tweet_id=#{opts[:tweet_id]}"
delete_from_twitter(opts[:tweet_id])
end
private
def client
@client ||= Twitter::REST::Client.new do |config|
config.consumer_key = AppConfig.services.twitter.key
config.consumer_secret = AppConfig.services.twitter.secret
config.access_token = access_token
config.access_token_secret = access_secret
end
end
def attempt_post post, retry_count=0
message = build_twitter_post post, retry_count
client.update message
rescue Twitter::Error::Forbidden => e
if ! e.message.include? 'is over 140' || retry_count == 20
raise e
else
attempt_post post, retry_count+1
end
end
def build_twitter_post post, retry_count=0
max_characters = MAX_CHARACTERS - retry_count
post_text = post.message.plain_text_without_markdown
truncate_and_add_post_link post, post_text, max_characters
end
def truncate_and_add_post_link post, post_text, max_characters
return post_text unless needs_link? post, post_text, max_characters
post_url = short_post_url(
post,
protocol: AppConfig.pod_uri.scheme,
host: AppConfig.pod_uri.authority
)
truncated_text = post_text.truncate max_characters - SHORTENED_URL_LENGTH + 1
truncated_text = restore_truncated_url truncated_text, post_text, max_characters
"#{truncated_text} #{post_url}"
end
def needs_link? post, post_text, max_characters
adjust_length_for_urls(post_text) > max_characters || post.photos.any?
end
def adjust_length_for_urls post_text
real_length = post_text.length
URI.extract(post_text, ['http','https']) do |url|
# add or subtract from real length - urls for tweets are always
# shortened to SHORTENED_URL_LENGTH
if url.length >= SHORTENED_URL_LENGTH
real_length -= url.length - SHORTENED_URL_LENGTH
else
real_length += SHORTENED_URL_LENGTH - url.length
end
end
real_length
end
def restore_truncated_url truncated_text, post_text, max_characters
return truncated_text if truncated_text !~ /#{LINK_PATTERN}\Z/
url = post_text.match(LINK_PATTERN, truncated_text.rindex('http'))[0]
truncated_text = post_text.truncate(
max_characters - SHORTENED_URL_LENGTH + 2,
separator: ' ', omission: ''
)
"#{truncated_text} #{url} ..."
end
def delete_from_twitter service_post_id
client.destroy_status service_post_id
end
end
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