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//! # File Block //! //! [slack api docs 🔗] //! //! Displays a [remote file 🔗] //! //! [slack api docs 🔗]: https://api.slack.com/reference/block-kit/blocks#file //! [remote file 🔗]: https://api.slack.com/messaging/files/remote use std::borrow::Cow; use serde::{Deserialize, Serialize}; use validator::Validate; use crate::val_helpr::ValidationResult; /// # File Block /// /// [slack api docs 🔗] /// /// Displays a [remote file 🔗] /// /// [slack api docs 🔗]: https://api.slack.com/reference/block-kit/blocks#file /// [remote file 🔗]: https://api.slack.com/messaging/files/remote #[derive(Clone, Debug, Deserialize, Hash, PartialEq, Serialize, Validate)] pub struct File<'a> { external_id: Cow<'a, str>, source: Cow<'a, str>, #[serde(skip_serializing_if = "Option::is_none")] #[validate(custom = "super::validate_block_id")] block_id: Option<Cow<'a, str>>, } impl<'a> File<'a> { /// Build a new File block. /// /// For example, see docs for FileBuilder. pub fn builder() -> build::FileBuilderInit<'a> { build::FileBuilderInit::new() } /// Create a file block from a [remote file 🔗]'s external ID. /// /// # Arguments /// - `external_file_id` - The external unique ID for this file, /// which notably is an ID in slack's system that is a reference /// or hyperlink to your original resource, which is hosted /// outside of Slack. /// Slack does not support uploading files to send in a block /// at this time. /// /// [remote file 🔗]: https://api.slack.com/messaging/files/remote /// /// # Example /// ``` /// use slack_blocks::{blocks, compose}; /// /// # fn upload_file_to_slack(s: &str) -> String { String::new() } /// # use std::error::Error; /// # pub fn main() -> Result<(), Box<dyn Error>> { /// let file_id = upload_file_to_slack("https://www.cheese.com/cheese-wheel.png"); /// /// let block = blocks::File::from_external_id(file_id); /// /// // < send to slack API > /// # Ok(()) /// # } /// ``` #[deprecated(since = "0.19.3", note = "use File::builder")] pub fn from_external_id(external_file_id: impl Into<Cow<'a, str>>) -> Self { Self { external_id: external_file_id.into(), source: "remote".into(), block_id: None } } /// Set a unique `block_id` to identify this instance of an File Block. /// /// # Arguments /// /// - `block_id` - A string acting as a unique identifier for a block. /// You can use this `block_id` when you receive an interaction /// payload to [identify the source of the action 🔗]. /// If not specified, one will be generated. /// Maximum length for this field is 255 characters. /// `block_id` should be unique for each message and each iteration of a message. /// If a message is updated, use a new `block_id`. /// /// [identify the source of the action 🔗]: https://api.slack.com/interactivity/handling#payloads /// /// # example /// ``` /// use slack_blocks::{blocks, compose}; /// /// # fn upload_file_to_slack(s: &str) -> String { String::new() } /// # use std::error::Error; /// # pub fn main() -> Result<(), Box<dyn Error>> { /// let file_id = upload_file_to_slack("https://www.cheese.com/cheese-wheel.png"); /// /// let block = blocks::File::from_external_id(file_id) /// .with_block_id("my_file_in_a_block_1234"); /// /// // < send to slack API > /// # Ok(()) /// # } /// ``` #[deprecated(since = "0.19.3", note = "use File::builder")] pub fn with_block_id(mut self, block_id: impl Into<Cow<'a, str>>) -> Self { self.block_id = Some(block_id.into()); self } /// Validate that this File block agrees with Slack's model requirements /// /// # Errors /// - If `with_block_id` was called with a block id longer /// than 256 chars /// /// # Example /// ``` /// use slack_blocks::{blocks, compose}; /// /// # use std::error::Error; /// # pub fn main() -> Result<(), Box<dyn Error>> { /// let long_string = std::iter::repeat(' ').take(256).collect::<String>(); /// /// let block = /// blocks::File::from_external_id("file_id").with_block_id(long_string); /// /// assert_eq!(true, matches!(block.validate(), Err(_))); /// /// // < send to slack API > /// # Ok(()) /// # } /// ``` pub fn validate(&self) -> ValidationResult { Validate::validate(self) } } /// File block builder pub mod build { use std::marker::PhantomData; use super::*; use crate::build::*; /// Compile-time markers for builder methods #[allow(non_camel_case_types)] pub mod method { /// FileBuilder.external_id #[derive(Clone, Copy, Debug)] pub struct external_id; } /// Initial state for `FileBuilder` pub type FileBuilderInit<'a> = FileBuilder<'a, RequiredMethodNotCalled<method::external_id>>; /// Build an File block /// /// Allows you to construct safely, with compile-time checks /// on required setter methods. /// /// # Required Methods /// `FileBuilder::build()` is only available if these methods have been called: /// - `external_id` /// - `source` /// /// # Example /// ``` /// use slack_blocks::{blocks::File, elems::Image, text::ToSlackPlaintext}; /// /// let my_file_id: String = { /// // use Slack Web API: files.remote.add to upload a file /// # "foo".into() /// }; /// /// let block = File::builder().external_id(my_file_id).build(); /// ``` #[derive(Debug)] pub struct FileBuilder<'a, ExternalId> { external_id: Option<Cow<'a, str>>, source: Option<Cow<'a, str>>, block_id: Option<Cow<'a, str>>, state: PhantomData<ExternalId>, } impl<'a, Ext> FileBuilder<'a, Ext> { /// Create a new FileBuilder pub fn new() -> Self { Self { external_id: None, source: None, block_id: None, state: PhantomData::<_> } } /// Set `external_id` (**Required**) /// /// The external unique ID for a [remote file 🔗]. /// /// [remote file 🔗]: https://api.slack.com/messaging/files/remote pub fn external_id<S>(self, external_id: S) -> FileBuilder<'a, Set<method::external_id>> where S: Into<Cow<'a, str>> { FileBuilder { external_id: Some(external_id.into()), source: self.source, block_id: self.block_id, state: PhantomData::<_> } } /// Set `block_id` (Optional) /// /// A string acting as a unique identifier for a block. /// /// You can use this `block_id` when you receive an interaction payload /// to [identify the source of the action 🔗]. /// /// If not specified, a `block_id` will be generated. /// /// Maximum length for this field is 255 characters. /// /// [identify the source of the action 🔗]: https://api.slack.com/interactivity/handling#payloads pub fn block_id<S>(mut self, block_id: S) -> Self where S: Into<Cow<'a, str>> { self.block_id = Some(block_id.into()); self } } impl<'a> FileBuilder<'a, Set<method::external_id>> { /// All done building, now give me a darn actions block! /// /// > `no method name 'build' found for struct 'FileBuilder<...>'`? /// Make sure all required setter methods have been called. See docs for `FileBuilder`. /// /// ```compile_fail /// use slack_blocks::blocks::File; /// /// let foo = File::builder().build(); // Won't compile! /// ``` /// /// ``` /// use slack_blocks::{blocks::File, /// compose::text::ToSlackPlaintext, /// elems::Image}; /// /// let my_file_id: String = { /// // use Slack Web API: files.remote.add to upload a file /// # "foo".into() /// }; /// /// let block = File::builder().external_id(my_file_id).build(); /// ``` pub fn build(self) -> File<'a> { File { external_id: self.external_id.unwrap(), source: "remote".into(), block_id: self.block_id } } } }