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