Merge branch '5-feat-repeat-mastodon-poll-in-twitter' into 'main'

feat: add poll from Mastodon to Twitter + pass owned values in post_tweet

Closes #5

See merge request veretcle/oolatoocs!7

Cargo.toml

@@ -1,22 +1,24 @@
 [package]
 name = "oolatoocs"
-version = "0.1.0"
+version = "1.5.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+chrono = "0.4.31"
 clap = "^4"
-dissolve = "0.2.2"
 env_logger = "^0.10"
+futures = "^0.3"
+html-escape = "^0.2"
 log = "^0.4"
 megalodon = "^0.11"
 oauth1-request = "^0.6"
-regex = "1.10.2"
-reqwest = { version = "0.11.22", features = ["json"] }
+regex = "^1.10"
+reqwest = { version = "^0.11", features = ["json", "stream", "multipart"] }
 rusqlite = "^0.27"
 serde = { version = "^1.0", features = ["derive"] }
-tokio = { version = "^1.33", features = ["rt-multi-thread", "macros"] }
+tokio = { version = "^1.33", features = ["rt-multi-thread", "macros", "time"] }
 toml = "^0.8"
 
 [profile.release]

README.md

@@ -0,0 +1,77 @@
+# oolatoocs, a Mastodon to Twitter bot
+
+So what is it? Originally, I wrote, with some help, [Scootaloo](https://framagit.org/veretcle/scootaloo/) which was a Twitter to Mastodon Bot to help the [writers at NintendojoFR](https://www.nintendojo.fr) not to worry about Mastodon: the vast majority of writers were posting to Twitter, the bot scooped everything and arranged it properly for Mastodon and everything was fine and dandy. It was also used, in an altered beefed-up version, for [Nupes.social](https://nupes.social) to make the tweets from the NUPES political alliance on Twitter, more easily accessible in Mastodon.
+
+But then Elon came, and we couldn’t read data from Twitter anymore. So we had to rely on copy/pasting things from one to another, which is not fun nor efficient.
+
+Hence `oolatoocs`, which takes a Mastodon Timeline and reposts it to Twitter as properly as possible.
+
+# Remarkable features
+
+What it can do:
+* Reproduces the Toot content into the Tweet;
+* Cuts (poorly) the Toot in half in it’s too long for Twitter and thread it (this is cut using a word count, not the best method, but it gets the job done);
+* Reuploads images/gifs/videos from Mastodon to Twitter
+* Can reproduce threads from Mastodon to Twitter
+* Can reproduce poll from Mastodon to Twitter
+* Can prevent a Toot from being tweeted by using the #NoTweet (case-insensitive) hashtag in Mastodon
+
+# Configuration file
+
+The configuration is relatively easy to follow:
+
+```toml
+[oolatoocs]
+db_path = "/var/lib/oolatoocs/db.sqlite3" # the path to the DB where toot/tweet are stored
+
+[mastodon] # This part can be generated, see below
+base = "https://m.nintendojo.fr"
+client_id = "<REDACTED>"
+client_secret = "<REDACTED>"
+redirect = "urn:ietf:wg:oauth:2.0:oob"
+token = "<REDACTED>"
+
+[twitter] # you’ll have to get this part from Twitter, this can be done via https://developer.twitter.com/en
+consumer_key = "<REDACTED>"
+consumer_secret = "<REDACTED>"
+oauth_token = "<REDACTED>"
+oauth_token_secret = "<REDACTED>"
+```
+
+## How to generate the Mastodon keys?
+
+Just run:
+
+```bash
+oolatoocs register --host https://<your-instance>
+```
+
+And follow the instructions.
+
+## How to generate the Twitter part?
+
+You’ll need to generate a key. This is a real pain in the ass, but you can use [this script](https://github.com/twitterdev/Twitter-API-v2-sample-code/blob/main/Manage-Tweets/create_tweet.py), modify it and run it to recover you key.
+
+Will I some day make a subcommand to generate it? Maybe…
+
+# How to run
+
+First of all, the `--help`:
+
+```bash
+A Mastodon to Twitter Bot
+
+Usage: oolatoocs [OPTIONS] [COMMAND]
+
+Commands:
+  init      Command to init the DB
+  register  Command to register to Mastodon Instance
+  help      Print this message or the help of the given subcommand(s)
+
+Options:
+  -c, --config <CONFIG_FILE>  TOML config file for oolatoocs [default: /usr/local/etc/oolatoocs.toml]
+  -h, --help                  Print help
+  -V, --version               Print version
+```
+
+Ideally, you’ll put it an cron (from a non-root user), with the default path for config file and let it do its job. Yeah, that’s it.

src/config.rs

@@ -8,7 +8,7 @@ pub struct Config {
     pub twitter: TwitterConfig,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Clone)]
 pub struct TwitterConfig {
     pub consumer_key: String,
     pub consumer_secret: String,

src/error.rs

@@ -0,0 +1,25 @@
+use std::{
+    error::Error,
+    fmt::{Display, Formatter, Result},
+};
+
+#[derive(Debug)]
+pub struct OolatoocsError {
+    details: String,
+}
+
+impl OolatoocsError {
+    pub fn new(msg: &str) -> OolatoocsError {
+        OolatoocsError {
+            details: msg.to_string(),
+        }
+    }
+}
+
+impl Error for OolatoocsError {}
+
+impl Display for OolatoocsError {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        write!(f, "{}", self.details)
+    }
+}

src/lib.rs

@@ -1,3 +1,6 @@
+mod error;
+pub use error::OolatoocsError;
+
 mod config;
 pub use config::{parse_toml, Config};
 
@@ -11,11 +14,11 @@ use mastodon::get_mastodon_timeline_since;
 pub use mastodon::register;
 
 mod utils;
-use utils::strip_everything;
+use utils::{generate_multi_tweets, strip_everything};
 
 mod twitter;
 #[allow(unused_imports)]
-use twitter::{post_tweet, upload_media};
+use twitter::{generate_media_ids, post_tweet, transform_poll};
 
 use rusqlite::Connection;
 
@@ -33,15 +36,45 @@ pub async fn run(config: &Config) {
         .unwrap_or_else(|e| panic!("Cannot get instance: {}", e));
 
     for toot in timeline {
-        let Ok(tweet_content) = strip_everything(&toot.content, &toot.tags) else {
+        // detecting tag #NoTweet and skipping the toot
+        if toot.tags.iter().any(|f| &f.name == "notweet") {
+            continue;
+        }
+
+        // form tweet_content and strip everything useless in it
+        let Ok(mut tweet_content) = strip_everything(&toot.content, &toot.tags) else {
             continue; // skip in case we can’t strip something
         };
-        // if we wanted to cut toot in half, now would be the right time to do so
-        // treating medias (nothing for now)
-        let tweet_id = post_tweet(&config.twitter, &tweet_content, &[])
+
+        // threads if necessary
+        let mut reply_to = toot.in_reply_to_id.and_then(|t| {
+            read_state(&conn, Some(t.parse::<u64>().unwrap()))
+                .ok()
+                .flatten()
+                .map(|s| s.tweet_id)
+        });
+
+        // if the toot is too long, we cut it in half here
+        if let Some((first_half, second_half)) = generate_multi_tweets(&tweet_content) {
+            tweet_content = second_half;
+            let reply_id = post_tweet(&config.twitter, first_half, vec![], reply_to, None)
+                .await
+                .unwrap_or_else(|e| panic!("Cannot post the first half of {}: {}", &toot.id, e));
+            reply_to = Some(reply_id);
+        };
+
+        // treats poll if any
+        let in_poll = toot.poll.map(|p| transform_poll(&p));
+
+        // treats medias
+        let medias = generate_media_ids(&config.twitter, &toot.media_attachments).await;
+
+        // posts corresponding tweet
+        let tweet_id = post_tweet(&config.twitter, tweet_content, medias, reply_to, in_poll)
             .await
             .unwrap_or_else(|e| panic!("Cannot Tweet {}: {}", toot.id, e));
 
+        // writes the current state of the tweet
         write_state(
             &conn,
             TweetToToot {

src/mastodon.rs

@@ -34,7 +34,6 @@ pub async fn get_mastodon_timeline_since(
         .await?
         .json()
         .iter()
-        .cloned()
         .filter(|t| {
             // this excludes the reply to other users
             t.in_reply_to_account_id.is_none()
@@ -45,6 +44,7 @@ pub async fn get_mastodon_timeline_since(
         .filter(|t| t.visibility == StatusVisibility::Public) // excludes everything that isn’t
         // public
         .filter(|t| t.reblog.is_none()) // excludes reblogs
+        .cloned()
         .collect();
 
     timeline.reverse();

src/twitter.rs

@@ -1,26 +1,106 @@
 use crate::config::TwitterConfig;
+use crate::error::OolatoocsError;
+use chrono::Utc;
+use futures::{stream, StreamExt};
+use log::{debug, error, warn};
+use megalodon::entities::{
+    attachment::{Attachment, AttachmentType},
+    Poll,
+};
 use oauth1_request::Token;
-use reqwest::Client;
+use reqwest::{
+    multipart::{Form, Part},
+    Body, Client,
+};
 use serde::{Deserialize, Serialize};
-use std::error::Error;
+use std::{error::Error, ops::Not};
+use tokio::time::{sleep, Duration};
 
-/// I don’t know, don’t ask me
+const TWITTER_API_TWEET_URL: &str = "https://api.twitter.com/2/tweets";
+const TWITTER_UPLOAD_MEDIA_URL: &str = "https://upload.twitter.com/1.1/media/upload.json";
+const TWITTER_METADATA_MEDIA_URL: &str =
+    "https://upload.twitter.com/1.1/media/metadata/create.json";
+
+// I don’t know, don’t ask me
 #[derive(oauth1_request::Request)]
 struct EmptyRequest {}
 
 #[derive(Serialize, Debug)]
-pub struct Tweet {
-    pub text: String,
+struct Tweet {
+    text: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    media: Option<TweetMediasIds>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    reply: Option<TweetReply>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    poll: Option<TweetPoll>,
+}
+
+#[derive(Serialize, Debug)]
+struct TweetMediasIds {
+    media_ids: Vec<String>,
+}
+
+#[derive(Serialize, Debug)]
+struct TweetReply {
+    in_reply_to_tweet_id: String,
+}
+
+#[derive(Serialize, Debug)]
+pub struct TweetPoll {
+    pub options: Vec<String>,
+    pub duration_minutes: i64,
 }
 
 #[derive(Deserialize, Debug)]
-pub struct TweetResponse {
-    pub data: TweetResponseData,
+struct TweetResponse {
+    data: TweetResponseData,
 }
 
 #[derive(Deserialize, Debug)]
-pub struct TweetResponseData {
-    pub id: String,
+struct TweetResponseData {
+    id: String,
+}
+
+#[derive(Deserialize, Debug)]
+struct UploadMediaResponse {
+    media_id: u64,
+    processing_info: Option<UploadMediaResponseProcessingInfo>,
+}
+
+#[derive(Deserialize, Debug)]
+struct UploadMediaResponseProcessingInfo {
+    state: UploadMediaResponseProcessingInfoState,
+    check_after_secs: Option<u64>,
+}
+
+#[derive(Deserialize, Debug)]
+enum UploadMediaResponseProcessingInfoState {
+    #[serde(rename = "failed")]
+    Failed,
+    #[serde(rename = "succeeded")]
+    Succeeded,
+    #[serde(rename = "pending")]
+    Pending,
+    #[serde(rename = "in_progress")]
+    InProgress,
+}
+
+#[derive(Serialize, Debug)]
+struct MediaMetadata {
+    media_id: u64,
+    alt_text: MediaMetadataAltText,
+}
+
+#[derive(Serialize, Debug)]
+struct MediaMetadataAltText {
+    text: String,
+}
+
+#[derive(Serialize, Debug, oauth1_request::Request)]
+struct UploadMediaCommand {
+    command: String,
+    media_id: String,
 }
 
 /// This function returns the OAuth1 Token object from TwitterConfig
@@ -33,32 +113,365 @@ fn get_token(config: &TwitterConfig) -> Token {
     )
 }
 
-/// This function uploads media from Mastodon to Twitter and returns the media id from Twitter
-#[allow(dead_code)]
-pub async fn upload_media(_u: &str) -> Result<u64, Box<dyn Error>> {
-    Ok(0)
+pub async fn generate_media_ids(config: &TwitterConfig, media_attach: &[Attachment]) -> Vec<u64> {
+    let mut medias: Vec<u64> = vec![];
+
+    let media_attachments = media_attach.to_owned();
+    let mut stream = stream::iter(media_attachments)
+        .map(|media| {
+            let twitter_config = config.clone();
+            tokio::task::spawn(async move {
+                match media.r#type {
+                    AttachmentType::Image => {
+                        upload_simple_media(&twitter_config, &media.url, &media.description).await
+                    }
+                    AttachmentType::Gifv => {
+                        upload_chunk_media(&twitter_config, &media.url, "tweet_gif").await
+                    }
+                    AttachmentType::Video => {
+                        upload_chunk_media(&twitter_config, &media.url, "tweet_video").await
+                    }
+                    _ => Err::<u64, Box<dyn Error + Send + Sync>>(
+                        OolatoocsError::new(&format!(
+                            "Cannot treat this type of media: {}",
+                            &media.url
+                        ))
+                        .into(),
+                    ),
+                }
+            })
+        })
+        .buffered(4);
+
+    while let Some(result) = stream.next().await {
+        match result {
+            Ok(Ok(v)) => medias.push(v),
+            Ok(Err(e)) => warn!("Cannot treat media: {}", e),
+            Err(e) => error!("Something went wrong when joining the main thread: {}", e),
+        }
+    }
+
+    medias
+}
+
+/// This function uploads simple images from Mastodon to Twitter and returns the media id from Twitter
+async fn upload_simple_media(
+    config: &TwitterConfig,
+    u: &str,
+    d: &Option<String>,
+) -> Result<u64, Box<dyn Error + Send + Sync>> {
+    // initiate request parameters
+    let empty_request = EmptyRequest {}; // Why? Because fuck you, that’s why!
+    let token = get_token(config);
+
+    // retrieve the length and bytes stream from the given URL
+    let dl = reqwest::get(u).await?;
+    let content_length = dl
+        .content_length()
+        .ok_or(format!("Cannot get content length for {}", u))?;
+    let stream = dl.bytes_stream();
+
+    debug!("Ref download URL: {}", u);
+
+    // upload the media
+    let client = Client::new();
+    let res = client
+        .post(TWITTER_UPLOAD_MEDIA_URL)
+        .header(
+            "Authorization",
+            oauth1_request::post(
+                TWITTER_UPLOAD_MEDIA_URL,
+                &empty_request,
+                &token,
+                oauth1_request::HMAC_SHA1,
+            ),
+        )
+        .multipart(Form::new().part(
+            "media",
+            Part::stream_with_length(Body::wrap_stream(stream), content_length),
+        ))
+        .send()
+        .await?
+        .json::<UploadMediaResponse>()
+        .await?;
+
+    debug!("Media ID: {}", res.media_id);
+
+    // update the metadata
+    if let Some(metadata) = d {
+        debug!("Metadata found! Processing…");
+        metadata_create(config, res.media_id, metadata).await?;
+    }
+
+    Ok(res.media_id)
+}
+
+/// This function updates the metadata given the current media_id and token
+async fn metadata_create(
+    config: &TwitterConfig,
+    id: u64,
+    m: &str,
+) -> Result<(), Box<dyn Error + Send + Sync>> {
+    let token = get_token(config);
+    let empty_request = EmptyRequest {};
+
+    let media_metadata = MediaMetadata {
+        media_id: id,
+        alt_text: MediaMetadataAltText {
+            text: m.to_string(),
+        },
+    };
+
+    debug!("Metadata to process: {}", m);
+
+    let client = Client::new();
+    let metadata = client
+        .post(TWITTER_METADATA_MEDIA_URL)
+        .header(
+            "Authorization",
+            oauth1_request::post(
+                TWITTER_METADATA_MEDIA_URL,
+                &empty_request,
+                &token,
+                oauth1_request::HMAC_SHA1,
+            ),
+        )
+        .json(&media_metadata)
+        .send()
+        .await?;
+
+    debug!("Metadata processed with return code: {}", metadata.status());
+
+    Ok(())
+}
+
+/// This posts video/gif to Twitter and returns the media id from Twitter
+async fn upload_chunk_media(
+    config: &TwitterConfig,
+    u: &str,
+    t: &str,
+) -> Result<u64, Box<dyn Error + Send + Sync>> {
+    let empty_request = EmptyRequest {};
+    let token = get_token(config);
+
+    // retrieve the length, type and bytes stream from the given URL
+    let mut dl = reqwest::get(u).await?;
+    let content_length = dl
+        .content_length()
+        .ok_or(format!("Cannot get content length for {}", u))?;
+    let content_headers = dl.headers().clone();
+    let content_type = content_headers
+        .get("Content-Type")
+        .ok_or(format!("Cannot get content type for {}", u))?
+        .to_str()?;
+
+    debug!("Init the slot for uploading media: {}", u);
+    // init the slot for uploading
+    let client = Client::new();
+    let orig_media_id = client
+        .post(TWITTER_UPLOAD_MEDIA_URL)
+        .header(
+            "Authorization",
+            oauth1_request::post(
+                TWITTER_UPLOAD_MEDIA_URL,
+                &empty_request,
+                &token,
+                oauth1_request::HMAC_SHA1,
+            ),
+        )
+        .multipart(
+            Form::new()
+                .text("command", "INIT")
+                .text("media_type", content_type.to_owned())
+                .text("total_bytes", content_length.to_string())
+                .text("media_category", t.to_string()),
+        )
+        .send()
+        .await?
+        .json::<UploadMediaResponse>()
+        .await?;
+
+    debug!("Slot initiated with ID: {}", orig_media_id.media_id);
+
+    debug!("Appending media to ID: {}", orig_media_id.media_id);
+    // append the media to the corresponding slot
+    let mut segment: u8 = 0;
+    while let Some(chunk) = dl.chunk().await? {
+        debug!(
+            "Appending segment {} for media ID {}",
+            segment, orig_media_id.media_id
+        );
+        let chunk_size: u64 = chunk.len().try_into().unwrap();
+        let res = client
+            .post(TWITTER_UPLOAD_MEDIA_URL)
+            .header(
+                "Authorization",
+                oauth1_request::post(
+                    TWITTER_UPLOAD_MEDIA_URL,
+                    &empty_request,
+                    &token,
+                    oauth1_request::HMAC_SHA1,
+                ),
+            )
+            .multipart(
+                Form::new()
+                    .text("command", "APPEND")
+                    .text("media_id", orig_media_id.media_id.to_string())
+                    .text("segment_index", segment.to_string())
+                    .part("media", Part::stream_with_length(chunk, chunk_size)),
+            )
+            .send()
+            .await?;
+
+        if !res.status().is_success() {
+            return Err(
+                OolatoocsError::new(&format!("Cannot upload part {} of {}", segment, u)).into(),
+            );
+        }
+
+        segment += 1;
+    }
+
+    debug!("Finalize media ID: {}", orig_media_id.media_id);
+    // Finalizing task
+    let fin = client
+        .post(TWITTER_UPLOAD_MEDIA_URL)
+        .header(
+            "Authorization",
+            oauth1_request::post(
+                TWITTER_UPLOAD_MEDIA_URL,
+                &empty_request,
+                &token,
+                oauth1_request::HMAC_SHA1,
+            ),
+        )
+        .multipart(
+            Form::new()
+                .text("command", "FINALIZE")
+                .text("media_id", orig_media_id.media_id.to_string()),
+        )
+        .send()
+        .await?
+        .json::<UploadMediaResponse>()
+        .await?;
+
+    if let Some(p_info) = fin.processing_info {
+        if let Some(wait_sec) = p_info.check_after_secs {
+            debug!(
+                "Processing is not finished yet for ID {}, waiting {} secs",
+                orig_media_id.media_id, wait_sec
+            );
+            // getting here, we have a status and a check_after_secs
+            // this status can be anything but we will check it afterwards
+            // whatever happens, we can wait here before proceeding
+            sleep(Duration::from_secs(wait_sec)).await;
+
+            let command = UploadMediaCommand {
+                command: "STATUS".to_string(),
+                media_id: orig_media_id.media_id.to_string(),
+            };
+
+            loop {
+                debug!(
+                    "Checking on status for ID {} after waiting {} secs",
+                    orig_media_id.media_id, wait_sec
+                );
+
+                let status = client
+                    .get(TWITTER_UPLOAD_MEDIA_URL)
+                    .header(
+                        "Authorization",
+                        oauth1_request::get(
+                            TWITTER_UPLOAD_MEDIA_URL,
+                            &command,
+                            &token,
+                            oauth1_request::HMAC_SHA1,
+                        ),
+                    )
+                    .query(&command)
+                    .send()
+                    .await?
+                    .json::<UploadMediaResponse>()
+                    .await?;
+
+                let p_status = status.processing_info.unwrap(); // shouldn’t be None at this point
+                match p_status.state {
+                    UploadMediaResponseProcessingInfoState::Failed => {
+                        debug!("Processing has failed!");
+                        return Err(OolatoocsError::new(&format!(
+                            "Upload for {} (id: {}) has failed",
+                            u, orig_media_id.media_id
+                        ))
+                        .into());
+                    }
+                    UploadMediaResponseProcessingInfoState::Succeeded => {
+                        debug!("Processing has succeeded, exiting loop!");
+                        break;
+                    }
+                    UploadMediaResponseProcessingInfoState::Pending
+                    | UploadMediaResponseProcessingInfoState::InProgress => {
+                        debug!(
+                            "Processing still pending, waiting {} secs more…",
+                            p_status.check_after_secs.unwrap() // unwrap is safe here,
+                                                               // check_after_secs is only present
+                                                               // when status is pending or in
+                                                               // progress
+                        );
+                        sleep(Duration::from_secs(p_status.check_after_secs.unwrap())).await;
+                        continue;
+                    }
+                }
+            }
+        }
+    }
+
+    Ok(orig_media_id.media_id)
+}
+
+pub fn transform_poll(p: &Poll) -> TweetPoll {
+    let poll_end_datetime = p.expires_at.unwrap(); // should be safe at this point
+    let now = Utc::now();
+    let diff = poll_end_datetime.signed_duration_since(now);
+
+    TweetPoll {
+        options: p.options.iter().map(|i| i.title.clone()).collect(),
+        duration_minutes: diff.num_minutes(),
+    }
 }
 
 /// This posts Tweets with all the associated medias
 pub async fn post_tweet(
     config: &TwitterConfig,
-    content: &str,
-    _medias: &[u64],
+    content: String,
+    medias: Vec<u64>,
+    reply_to: Option<u64>,
+    poll: Option<TweetPoll>,
 ) -> Result<u64, Box<dyn Error>> {
-    let uri = "https://api.twitter.com/2/tweets";
     let empty_request = EmptyRequest {}; // Why? Because fuck you, that’s why!
     let token = get_token(config);
 
     let tweet = Tweet {
-        text: content.to_string(),
+        text: content,
+        media: medias.is_empty().not().then(|| TweetMediasIds {
+            media_ids: medias.iter().map(|m| m.to_string()).collect(),
+        }),
+        reply: reply_to.map(|s| TweetReply {
+            in_reply_to_tweet_id: s.to_string(),
+        }),
+        poll,
     };
 
     let client = Client::new();
     let res = client
-        .post(uri)
+        .post(TWITTER_API_TWEET_URL)
         .header(
             "Authorization",
-            oauth1_request::post(uri, &empty_request, &token, oauth1_request::HMAC_SHA1),
+            oauth1_request::post(
+                TWITTER_API_TWEET_URL,
+                &empty_request,
+                &token,
+                oauth1_request::HMAC_SHA1,
+            ),
         )
         .json(&tweet)
         .send()

src/utils.rs

@@ -1,15 +1,59 @@
-use dissolve::strip_html_tags;
+use html_escape::decode_html_entities;
 use megalodon::entities::status::Tag;
 use regex::Regex;
 use std::error::Error;
 
+/// Generate 2 contents out of 1 if that content is > 280 chars, None else
+pub fn generate_multi_tweets(content: &str) -> Option<(String, String)> {
+    // Twitter webforms are utf-8 encoded, so we cannot count on len(), we don’t need
+    // encode_utf16().count()
+    if twitter_count(content) <= 280 {
+        return None;
+    }
+
+    let split_content = content.split(' ');
+
+    let split_count = split_content.clone().count();
+
+    let first_half: String = split_content
+        .clone()
+        .take(split_count / 2)
+        .collect::<Vec<_>>()
+        .join(" ");
+    let second_half: String = split_content
+        .clone()
+        .skip(split_count / 2)
+        .collect::<Vec<_>>()
+        .join(" ");
+
+    Some((first_half, second_half))
+}
+
+/// Twitter doesn’t count words the same we do, so you’ll have to improvise
+fn twitter_count(content: &str) -> usize {
+    let mut count = 0;
+
+    let split_content = content.split(' ');
+    count += split_content.clone().count() - 1; // count the spaces
+
+    for word in split_content {
+        if word.starts_with("http://") || word.starts_with("https://") {
+            count += 23;
+        } else {
+            count += word.chars().count();
+        }
+    }
+
+    count
+}
+
 pub fn strip_everything(content: &str, tags: &Vec<Tag>) -> Result<String, Box<dyn Error>> {
-    let mut res =
-        strip_html_tags(&content.replace("</p><p>", "\n\n").replace("<br />", "\n")).join("");
+    let mut res = strip_html_tags(&content.replace("</p><p>", "\n\n").replace("<br />", "\n"));
 
     strip_mastodon_tags(&mut res, tags).unwrap();
 
     res = res.trim_end_matches('\n').trim_end_matches(' ').to_string();
+    res = decode_html_entities(&res).to_string();
 
     Ok(res)
 }
@@ -22,3 +66,109 @@ fn strip_mastodon_tags(content: &mut String, tags: &Vec<Tag>) -> Result<(), Box<
 
     Ok(())
 }
+
+fn strip_html_tags(input: &str) -> String {
+    let mut data = String::new();
+    let mut inside = false;
+
+    for c in input.chars() {
+        if c == '<' {
+            inside = true;
+            continue;
+        }
+        if c == '>' {
+            inside = false;
+            continue;
+        }
+        if !inside {
+            data.push(c);
+        }
+    }
+
+    data
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_twitter_count() {
+        let content = "tamerelol?! 🐵";
+
+        assert_eq!(twitter_count(content), content.chars().count());
+
+        let content = "Shoot out to https://y.ml/ !";
+
+        assert_eq!(twitter_count(content), 38);
+
+        let content = "this is the link https://www.google.com/tamerelol/youpi/tonperemdr/tarace.html if you like! What if I shit a final";
+
+        assert_eq!(twitter_count(content), 76);
+    }
+
+    #[test]
+    fn test_generate_multi_tweets_to_none() {
+        // test « standard » text
+        let tweet_content =
+            "LOLOLOL, je suis bien trop petit pour être coupé en deux voyons :troll:".to_string();
+
+        let youpi = generate_multi_tweets(&tweet_content);
+
+        assert_eq!(None, youpi);
+
+        // test with « complex » emoji (2 utf-8 chars)
+        let tweet_content = "🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷".to_string();
+
+        let youpi = generate_multi_tweets(&tweet_content);
+
+        assert_eq!(None, youpi);
+    }
+
+    #[test]
+    fn test_generate_multi_tweets_to_some() {
+        let tweet_content = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ipsum dolor sit amet consectetur adipiscing elit pellentesque. Pharetra pharetra massa massa ultricies mi quis hendrerit dolor. Mauris nunc congue nisi vitae. Scelerisque varius morbi enim nunc faucibus a pellentesque sit amet. Morbi leo urna molestie at elementum. Tristique et egestas quis ipsum suspendisse ultrices gravida dictum fusce. Amet porttitor eget dolor morbi.".to_string();
+
+        let youpi = generate_multi_tweets(&tweet_content);
+
+        let first_half = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ipsum dolor sit amet consectetur adipiscing elit pellentesque. Pharetra pharetra massa massa ultricies mi quis hendrerit dolor.".to_string();
+        let second_half = "Mauris nunc congue nisi vitae. Scelerisque varius morbi enim nunc faucibus a pellentesque sit amet. Morbi leo urna molestie at elementum. Tristique et egestas quis ipsum suspendisse ultrices gravida dictum fusce. Amet porttitor eget dolor morbi.".to_string();
+
+        assert_eq!(youpi, Some((first_half, second_half)));
+    }
+
+    #[test]
+    fn test_strip_mastodon_tags() {
+        let tags = vec![
+            Tag {
+                name: "putaclic".to_string(),
+                url: "https://m.nintendojo.fr/tags/putaclic".to_string(),
+            },
+            Tag {
+                name: "tamerelol".to_string(),
+                url: "https://m.nintendojo.fr/tags/tamerelol".to_string(),
+            },
+            Tag {
+                name: "JeFaisNawakEnCamelCase".to_string(),
+                url: "https://m.nintendojo.fr/tags/jefaisnawakencamelcase".to_string(),
+            },
+        ];
+
+        let mut content =
+            "C’est super ça ! #putaclic #TAMERELOL #JeFaisNawakEnCamelCase".to_string();
+        let sample = "C’est super ça ! ".to_string();
+
+        strip_mastodon_tags(&mut content, &tags).unwrap();
+
+        assert_eq!(content, sample);
+    }
+
+    #[test]
+    fn test_strip_everything() {
+        let content = "<p>Ce soir à 21h, c&#39;est le Dojobar ! Au programme ce soir, une rétrospective sur la série Mario &amp; Luigi.<br />Comme d&#39;hab, le Twitch sera ici : <a href=\"https://twitch.tv/nintendojofr\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"\">twitch.tv/nintendojofr</span><span class=\"invisible\"></span></a><br />Ou juste l&#39;audio là : <a href=\"https://nintendojo.fr/dojobar\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"\">nintendojo.fr/dojobar</span><span class=\"invisible\"></span></a><br />A toute !</p>";
+        let expected_result = "Ce soir à 21h, c'est le Dojobar ! Au programme ce soir, une rétrospective sur la série Mario & Luigi.\nComme d'hab, le Twitch sera ici : https://twitch.tv/nintendojofr\nOu juste l'audio là : https://nintendojo.fr/dojobar\nA toute !".to_string();
+        let result = strip_everything(content, &vec![]).unwrap();
+
+        assert_eq!(result, expected_result);
+    }
+}