mirror of https://github.com/LemmyNet/lemmy.git
53 lines
1.8 KiB
Rust
53 lines
1.8 KiB
Rust
//! The enums here serve to limit a json string value to a single, hardcoded value which can be
|
|
//! verified at compilation time. When using it as the type of a struct field, the struct can only
|
|
//! be constructed or deserialized if the field has the exact same value.
|
|
//!
|
|
//! If we used String as the field type, any value would be accepted, and we would have to check
|
|
//! manually at runtime that it contains the expected value.
|
|
//!
|
|
//! The enums in [`activitystreams::activity::kind`] work in the same way, and can be used to
|
|
//! distinguish different activity types.
|
|
//!
|
|
//! In the example below, `MyObject` can only be constructed or
|
|
//! deserialized if `media_type` is `text/markdown`, but not if it is `text/html`.
|
|
//!
|
|
//! ```
|
|
//! use lemmy_apub_lib::values::MediaTypeMarkdown;
|
|
//! use serde_json::from_str;
|
|
//! use serde::{Deserialize, Serialize};
|
|
//!
|
|
//! #[derive(Deserialize, Serialize)]
|
|
//! struct MyObject {
|
|
//! content: String,
|
|
//! media_type: MediaTypeMarkdown,
|
|
//! }
|
|
//!
|
|
//! let markdown_json = r#"{"content": "**test**", "media_type": "text/markdown"}"#;
|
|
//! let from_markdown = from_str::<MyObject>(markdown_json);
|
|
//! assert!(from_markdown.is_ok());
|
|
//!
|
|
//! let markdown_html = r#"{"content": "<b>test</b>", "media_type": "text/html"}"#;
|
|
//! let from_html = from_str::<MyObject>(markdown_html);
|
|
//! assert!(from_html.is_err());
|
|
//! ```
|
|
|
|
use serde::{Deserialize, Serialize};
|
|
|
|
/// Media type for markdown text.
|
|
///
|
|
/// <https://www.iana.org/assignments/media-types/media-types.xhtml>
|
|
#[derive(Clone, Debug, Deserialize, Serialize)]
|
|
pub enum MediaTypeMarkdown {
|
|
#[serde(rename = "text/markdown")]
|
|
Markdown,
|
|
}
|
|
|
|
/// Media type for HTML text/
|
|
///
|
|
/// <https://www.iana.org/assignments/media-types/media-types.xhtml>
|
|
#[derive(Clone, Debug, Deserialize, Serialize)]
|
|
pub enum MediaTypeHtml {
|
|
#[serde(rename = "text/html")]
|
|
Html,
|
|
}
|