Frankenstein

Telegram bot API client for Rust.

It's a complete wrapper for Telegram bot API and it's up to date with version 5.3 of the API.

Frankenstein data structures (rust structs and enums) are mapped one-to-one from Telegram bot API objects and method params.

Installation

Add this to your Cargo.toml

toml [dependencies] frankenstein = "0.5"

Usage

Data structures

All objects described in the API docs have direct counterparts in the frankenstein. For example, in the docs there is the user type: id Integer Unique identifier for this user or bot. This number may have more than 32 significant bits and some programming languages may have difficulty/silent defects in interpreting it. But it has at most 52 significant bits, so a 64-bit integer or double-precision float type are safe for storing this identifier. is_bot Boolean True, if this user is a bot first_name String User's or bot's first name last_name String Optional. User's or bot's last name username String Optional. User's or bot's username language_code String Optional. IETF language tag of the user's language can_join_groups Boolean Optional. True, if the bot can be invited to groups. Returned only in getMe. can_read_all_group_messages Boolean Optional. True, if privacy mode is disabled for the bot. Returned only in getMe. supports_inline_queries Boolean Optional. True, if the bot supports inline queries. Returned only in getMe.

In frankenstein, it's described as:

```rust

[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]

pub struct User { pub id: i64,

pub is_bot: bool,

pub first_name: String,

#[serde(skip_serializing_if = "Option::is_none")]
pub last_name: Option<String>,

#[serde(skip_serializing_if = "Option::is_none")]
pub username: Option<String>,

#[serde(skip_serializing_if = "Option::is_none")]
pub language_code: Option<String>,

#[serde(skip_serializing_if = "Option::is_none")]
pub can_join_groups: Option<bool>,

#[serde(skip_serializing_if = "Option::is_none")]
pub can_read_all_group_messages: Option<bool>,

#[serde(skip_serializing_if = "Option::is_none")]
pub supports_inline_queries: Option<bool>,

} ```

Optional fields are described as Option enum.

Every struct has the new method which used for initialization. It accepts only required fields, optional fields are set to None:

rust pub fn new(id: i64, is_bot: bool, first_name: String) -> User { Self { id, is_bot, first_name, last_name: None, username: None, language_code: None, can_join_groups: None, can_read_all_group_messages: None, supports_inline_queries: None, } }

All fields have setter and getter methods :

```rust ...

pub fn setsupportsinlinequeries(&mut self, supportsinlinequeries: Option) { self.supportsinlinequeries = supportsinline_queries; } pub fn id(&self) -> i64 { self.id }

... ```

For method parameters, the same approach is used. The only difference for parameters is the name of the struct in frankenstein ends with Params postfix.

For example, parameters for leaveChat method:

```rust

[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]

pub struct LeaveChatParams { chat_id: ChatId, } ```

Making requests

To make a request to the telegram bot api:

1. Initialize the Api struct:

```rust use frankenstein::Api; use frankenstein::TelegramApi;

...

let token = "My_token"; let api = Api::new(token); ```

1. Use this api object to make requests to the Bot API:

```rust let mut updateparams = GetUpdatesParams::new(); updateparams.setallowedupdates(Some(vec!["message".to_string()]));

let result = api.getupdates(&updateparams); ```

Every function returns a Result enum with a successful response or failed response.

See a complete example in the examples directory.

Uploading files

Some methods in the API allow uploading files. In the frankenstein for this File struct is used:

```rust pub enum File { InputFile(InputFile), String(String), }

pub struct InputFile { path: std::path::PathBuf } ```

It has two variants:

• File::String is used to pass id of the already uploaded file
• File::InputFile is used to upload a new file using multipart upload.

Documentation

Frankenstein implements all telegram bot api methods. To see which parameters you should pass, check docs.rs

Replacing the default http client

The library uses ureq http client by default, but it can be easily replaced with any http client of your choice:

1. ureq comes with a default feature (impl). So the feature should be disabled:

toml frankenstein = { version = "0.5", default-features = false }

1. Implement TelegramApi trait which requires two functions:

• request_with_form_data is used to upload files
• request is used for requests without file uploads

You can check the default TelegramApi trait implementation for ureq.

Also, you can take a look at the implementation for isahc http client in the examples directory.

Without the default ureq implementation, frankenstein has only one dependency - serde.

Contributing

1. Fork it!
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

Author

Ayrat Badykov (@ayrat555)