tosho-mplus 0.1.0

//! # tosho-mplus
//!
//! ![crates.io version](https://img.shields.io/crates/v/tosho-mplus)
//!
//! An asynchronous client for the M+ API by S.
//!
//! The following crate is used by the [`tosho`] app.
//!
//! ## Usage
//!
//! Download the [`tosho`] app, or you can utilize this crate like any other Rust crate:
//!
//! ```rust,no_run
//! use tosho_mplus::MPClient;
//! use tosho_mplus::proto::Language;
//! use tosho_mplus::constants::get_constants;
//!
//! #[tokio::main]
//! async fn main() {
//!     let client = MPClient::new("1234", Language::English, get_constants(1));
//!     let home_view = client.get_home_page().await.unwrap();
//! }
//! ```
//!
//! ## Authentication
//!
//! The following sources do not have any easy authentication method.
//!
//! The command to authenticate is `tosho mp auth`.
//!
//! It's recommended that you set up network intercepting first; please read [INTERCEPTING](https://github.com/noaione/tosho-mango/blob/master/INTERCEPTING.md).
//!
//! Using the CLI, you can do this:
//!
//! ```bash
//! $ tosho mp auth secret
//! ```
//!
//! With crates, you can follow the above usages.
//!
//! ### Android
//!
//! 1. Open the source app.
//! 2. Click on the home page or my page.
//! 3. Observe the requests on HTTP Toolkit and find the request to the API that has `secret` as the query parameters.
//! 4. Save that secret elsewhere and authenticate with `tosho`.
//!
//! ## Disclaimer
//!
//! This project is designed as an experiment and to create a local copy for personal use. These tools will not circumvent any paywall, and you will need to purchase and own each chapter with your own account to be able to make your own local copy.
//!
//! We're not responsible if your account got deactivated.
//!
//! ## License
//!
//! This project is licensed with MIT License ([LICENSE](https://github.com/noaione/tosho-mango/blob/master/LICENSE) or <http://opensource.org/licenses/MIT>)
//!
//! [`tosho`]: https://crates.io/crates/tosho

pub mod constants;
pub mod helper;
pub mod proto;

use futures_util::StreamExt;
use std::io::Cursor;
use tokio::io::{self, AsyncWriteExt};

use constants::{Constants, API_HOST, IMAGE_HOST};
use helper::RankingType;
use prost::Message;
use proto::{CommentList, ErrorResponse, Language, SuccessOrError};

use crate::constants::BASE_API;
pub use crate::helper::ImageQuality;

/// Main client for interacting with the M+ API.
///
/// # Example
/// ```no_run
/// use tosho_mplus::MPClient;
/// use tosho_mplus::proto::Language;
/// use tosho_mplus::constants::get_constants;
///
/// #[tokio::main]
/// async fn main() {
///     let client = MPClient::new("1234", Language::English, get_constants(1));
///     let home_view = client.get_home_page().await.unwrap();
/// }
/// ```
///
/// # Boxed
///
/// All responses are [`Box`]-ed since it has widely varying sizes.
#[derive(Clone, Debug)]
pub struct MPClient {
    inner: reqwest::Client,
    secret: String,
    language: Language,
    constants: &'static Constants,
}

impl MPClient {
    /// Create a new client instance.
    ///
    /// # Parameters
    /// * `secret` - The secret key to use for the client.
    /// * `language` - The language to use for the client.
    /// * `constants` - The constants to use for the client.
    pub fn new(secret: &str, language: Language, constants: &'static Constants) -> Self {
        Self::make_client(secret, language, constants, None)
    }

    /// Attach a proxy to the client.
    ///
    /// This will clone the client and return a new client with the proxy attached.
    ///
    /// # Arguments
    /// * `proxy` - The proxy to attach to the client
    pub fn with_proxy(&self, proxy: reqwest::Proxy) -> Self {
        Self::make_client(&self.secret, self.language, self.constants, Some(proxy))
    }

    fn make_client(
        secret: &str,
        language: Language,
        constants: &'static Constants,
        proxy: Option<reqwest::Proxy>,
    ) -> Self {
        let mut headers = reqwest::header::HeaderMap::new();
        headers.insert(
            "Host",
            reqwest::header::HeaderValue::from_str(&API_HOST).unwrap(),
        );
        headers.insert(
            "User-Agent",
            reqwest::header::HeaderValue::from_str(&constants.api_ua).unwrap(),
        );

        let client = reqwest::Client::builder()
            .http2_adaptive_window(true)
            .http1_only()
            .use_rustls_tls()
            .default_headers(headers);

        let client = match proxy {
            Some(proxy) => client.proxy(proxy).build().unwrap(),
            None => client.build().unwrap(),
        };

        Self {
            inner: client,
            secret: secret.to_string(),
            language,
            constants,
        }
    }

    /// Modify the HashMap to add the required parameters.
    fn build_params(&self, params: &mut Vec<(String, String)>, with_lang: bool) {
        if with_lang {
            params.push((
                "lang".to_string(),
                self.language.as_language_code().to_owned(),
            ));
            params.push((
                "clang".to_string(),
                self.language.as_language_code().to_owned(),
            ));
        }
        params.push(("os".to_string(), self.constants.os_name.to_string()));
        params.push(("os_ver".to_string(), self.constants.os_ver.to_string()));
        params.push(("app_ver".to_string(), self.constants.app_ver.to_string()));
        params.push(("secret".to_string(), self.secret.clone()));
    }

    fn build_url(&self, path: &str) -> String {
        if path.starts_with('/') {
            return format!("{}{}", *BASE_API, path);
        }

        format!("{}/{}", *BASE_API, path)
    }

    fn empty_params(&self, with_lang: bool) -> Vec<(String, String)> {
        let mut params: Vec<(String, String)> = vec![];

        self.build_params(&mut params, with_lang);

        params
    }

    /// Get the initial view of the app.
    pub async fn get_initial(&self) -> anyhow::Result<APIResponse<proto::InitialViewV2>> {
        let request = self
            .inner
            .get(&self.build_url("init_v2"))
            .query(&self.empty_params(false))
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.initial_view_v2 {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No initial view found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get the main home view of the app.
    pub async fn get_home_page(&self) -> anyhow::Result<APIResponse<proto::HomeViewV3>> {
        let mut query_params = self.empty_params(true);
        query_params.insert(0, ("viewer_mode".to_string(), "horizontal".to_string()));

        let request = self
            .inner
            .get(&self.build_url("home_v4"))
            .query(&query_params)
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.home_view_v3 {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No home view found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get the user profile
    pub async fn get_user_profile(
        &self,
    ) -> anyhow::Result<APIResponse<proto::UserProfileSettings>> {
        let query = self.empty_params(false);
        let request = self
            .inner
            .get(&self.build_url("profile"))
            .query(&query)
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.user_profile_settings {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No user profile found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get the user settings.
    pub async fn get_user_settings(&self) -> anyhow::Result<APIResponse<proto::UserSettingsV2>> {
        let mut query_params = self.empty_params(true);
        query_params.insert(0, ("viewer_mode".to_string(), "horizontal".to_string()));

        let request = self
            .inner
            .get(&self.build_url("settings_v2"))
            .query(&query_params)
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.user_settings_v2 {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No user settings found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get the subscriptions list and details.
    pub async fn get_subscriptions(
        &self,
    ) -> anyhow::Result<APIResponse<proto::SubscriptionResponse>> {
        let request = self
            .inner
            .get(&self.build_url("subscription"))
            .query(&self.empty_params(false))
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.subscriptions {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No subscription response found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get all the available titles.
    pub async fn get_all_titles(&self) -> anyhow::Result<APIResponse<proto::TitleListOnlyV2>> {
        let request = self
            .inner
            .get(&self.build_url("title_list/all_v2"))
            .query(&self.empty_params(false))
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.all_titles_v2 {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No title list found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get title ranking list.
    ///
    /// # Arguments
    /// * `kind` - The type of ranking to get.
    pub async fn get_title_ranking(
        &self,
        kind: Option<RankingType>,
    ) -> anyhow::Result<APIResponse<proto::TitleRankingList>> {
        let kind = kind.unwrap_or(RankingType::Hottest);
        let mut query_params = self.empty_params(true);
        query_params.insert(0, ("type".to_string(), kind.to_string()));

        let request = self
            .inner
            .get(&self.build_url("title_list/rankingV2"))
            .query(&query_params)
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.title_ranking_v2 {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No title ranking found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get all free titles
    pub async fn get_free_titles(&self) -> anyhow::Result<APIResponse<proto::FreeTitles>> {
        let request = self
            .inner
            .get(&self.build_url("title_list/free_titles"))
            .query(&self.empty_params(false))
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.free_titles {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No free titles found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get the bookmarked titles
    pub async fn get_bookmarked_titles(&self) -> anyhow::Result<APIResponse<proto::TitleListOnly>> {
        let request = self
            .inner
            .get(&self.build_url("title_list/bookmark"))
            .query(&self.empty_params(false))
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.subscribed_titles {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No bookmarked titles found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get list of titles for specific language
    ///
    /// Internally, this use the "search" API which does not take any
    /// query information for some unknown reason.
    pub async fn get_search(&self) -> anyhow::Result<APIResponse<proto::SearchResults>> {
        let request = self
            .inner
            .get(&self.build_url("title_list/search"))
            .query(&self.empty_params(true))
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.search_results {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No titles found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get detailed information about a title.
    ///
    /// # Arguments
    /// * `title_id` - The ID of the title to get information about.
    pub async fn get_title_details(
        &self,
        title_id: u64,
    ) -> anyhow::Result<APIResponse<proto::TitleDetail>> {
        let mut query_params = self.empty_params(true);
        query_params.insert(0, ("title_id".to_string(), title_id.to_string()));

        let request = self
            .inner
            .get(&self.build_url("title_detailV3"))
            .query(&query_params)
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.title_detail {
                Some(inner_data) => {
                    let mut cloned_data = inner_data.clone();
                    cloned_data.chapter_groups.iter_mut().for_each(|group| {
                        group
                            .first_chapters
                            .iter_mut()
                            .for_each(|ch| ch.set_position(proto::ChapterPosition::First));

                        group
                            .last_chapters
                            .iter_mut()
                            .for_each(|ch| ch.set_position(proto::ChapterPosition::Last));

                        group
                            .mid_chapters
                            .iter_mut()
                            .for_each(|ch| ch.set_position(proto::ChapterPosition::Middle));
                    });

                    Ok(APIResponse::Success(Box::new(cloned_data)))
                }
                None => anyhow::bail!("No title details found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get chapter viewer information.
    ///
    /// # Arguments
    /// * `chapter` - The chapter to get information about.
    /// * `title` - The title of the chapter.
    /// * `quality` - The quality of the image to get.
    /// * `split` - Whether to split the image spread or not.
    pub async fn get_chapter_viewer(
        &self,
        chapter: &proto::Chapter,
        title: &proto::TitleDetail,
        quality: ImageQuality,
        split: bool,
    ) -> anyhow::Result<APIResponse<proto::ChapterViewer>> {
        let mut query_params = vec![];
        query_params.push(("chapter_id".to_string(), chapter.chapter_id.to_string()));
        query_params.push((
            "split".to_string(),
            if split { "yes" } else { "no" }.to_string(),
        ));
        query_params.push(("img_quality".to_string(), quality.to_string()));
        query_params.push(("viewer_mode".to_string(), chapter.default_view_mode()));
        // Determine the way to read the chapter
        if chapter.is_free() {
            query_params.push(("free_reading".to_string(), "yes".to_string()));
            query_params.push(("subscription_reading".to_string(), "no".to_string()));
            query_params.push(("ticket_reading".to_string(), "no".to_string()));
        } else if chapter.is_ticketed() {
            query_params.push(("ticket_reading".to_string(), "yes".to_string()));
            query_params.push(("free_reading".to_string(), "no".to_string()));
            query_params.push(("subscription_reading".to_string(), "no".to_string()));
        } else {
            let user_sub = title.user_subscription.clone().unwrap_or_default();
            let title_labels = title.title_labels.clone().unwrap_or_default();
            if user_sub.plan() >= title_labels.plan_type() {
                query_params.push(("subscription_reading".to_string(), "yes".to_string()));
                query_params.push(("ticket_reading".to_string(), "no".to_string()));
                query_params.push(("free_reading".to_string(), "no".to_string()));
            } else {
                anyhow::bail!(
                    "Chapter is not free and user does not have minimum subscription: {:?} < {:?}",
                    user_sub.plan(),
                    title_labels.plan_type()
                );
            }
        }
        self.build_params(&mut query_params, false);

        let request = self
            .inner
            .get(&self.build_url("manga_viewer"))
            .query(&query_params)
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.chapter_viewer {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No chapter viewer found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Get comments for a chapter
    ///
    /// # Parameters
    /// * `id` - The ID of the chapter to get comments for.
    pub async fn get_comments(&self, id: u64) -> anyhow::Result<APIResponse<CommentList>> {
        let mut query_params = self.empty_params(false);
        query_params.insert(0, ("chapter_id".to_string(), id.to_string()));

        let request = self
            .inner
            .get(&self.build_url("comments"))
            .query(&query_params)
            .send()
            .await?;

        let response = parse_response(request).await?;

        match response {
            SuccessOrError::Success(data) => match data.comment_list {
                Some(inner_data) => Ok(APIResponse::Success(Box::new(inner_data))),
                None => anyhow::bail!("No comments found"),
            },
            SuccessOrError::Error(error) => Ok(APIResponse::Error(error)),
        }
    }

    /// Stream download the image from the given URL.
    ///
    /// The URL can be obtained from [`get_chapter_images`](#method.get_chapter_images).
    ///
    /// # Parameters
    /// * `url` - The URL to download the image from.
    /// * `writer` - The writer to write the image to.
    pub async fn stream_download(
        &self,
        url: &str,
        mut writer: impl io::AsyncWrite + Unpin,
    ) -> anyhow::Result<()> {
        let res = self
            .inner
            .get(url)
            .headers({
                let mut headers = reqwest::header::HeaderMap::new();
                headers.insert(
                    "Host",
                    reqwest::header::HeaderValue::from_str(&IMAGE_HOST).unwrap(),
                );
                headers.insert(
                    "User-Agent",
                    reqwest::header::HeaderValue::from_str(&self.constants.image_ua).unwrap(),
                );
                headers.insert(
                    "Cache-Control",
                    reqwest::header::HeaderValue::from_static("no-cache"),
                );
                headers
            })
            .send()
            .await?;

        // bail if not success
        if !res.status().is_success() {
            anyhow::bail!("Failed to download image: {}", res.status())
        }

        let mut stream = res.bytes_stream();
        while let Some(item) = stream.next().await {
            let item = item.unwrap();
            writer.write_all(&item).await?;
        }

        Ok(())
    }
}

/// A common return type for all API calls.
///
/// It either returns the specified success response or an error.
pub enum APIResponse<T: ::prost::Message + Clone> {
    Error(Box<ErrorResponse>),
    Success(Box<T>),
}

// impl unwrap for APIResponse
impl<T: ::prost::Message + Clone> APIResponse<T> {
    /// Unwrap the response.
    ///
    /// # Panics
    /// Panics if the response is an error.
    pub fn unwrap(self) -> T {
        match self {
            APIResponse::Success(data) => *data,
            APIResponse::Error(error) => panic!("Error response: {:?}", *error),
        }
    }
}

async fn parse_response(res: reqwest::Response) -> anyhow::Result<SuccessOrError> {
    if !res.status().is_success() {
        anyhow::bail!("Error response: {:?}", res.status());
    }

    let bytes_data = res.bytes().await?;
    let cursor = bytes_data.as_ref();

    let decoded_response = crate::proto::Response::decode(&mut Cursor::new(cursor));

    if let Err(e) = decoded_response {
        anyhow::bail!("Error decoding response: {:?}", e);
    }

    let decoded_response = decoded_response.unwrap();

    // oneof response on .response
    match decoded_response.response {
        Some(response) => Ok(response),
        None => anyhow::bail!("No response found"),
    }
}