95 lines
3.0 KiB
Rust
95 lines
3.0 KiB
Rust
use germ::ast::{Ast as GeminiAst, Node as GemtextNode};
|
|
use germ::meta::Meta as GeminiMetadata;
|
|
use germ::request::request as germ_request;
|
|
use url::Url;
|
|
|
|
use crate::error::GementionError;
|
|
use crate::models::*;
|
|
|
|
const OUR_ENDPOINT: &'static str = "titan://localhost/receive/";
|
|
|
|
fn is_mention_link(gemtext_link: &str) -> bool {
|
|
gemtext_link.starts_with(OUR_ENDPOINT)
|
|
}
|
|
|
|
fn scan_for_mentions(meta: GeminiMetadata, ast: GeminiAst) -> (VerificationSource, Vec<String>) {
|
|
// Check metadata of the page for a gemention endpoint.
|
|
if let Some(endpoint) = meta.parameters().get("gemention") {
|
|
let endpoint = endpoint.trim_start_matches("=");
|
|
return (VerificationSource::Meta, vec![endpoint.to_owned()]);
|
|
}
|
|
|
|
// If that fails, check the page itself for the first available
|
|
// link that matches.
|
|
let endpoints = ast
|
|
.inner()
|
|
.into_iter()
|
|
.filter_map(|node| match node {
|
|
GemtextNode::Link { ref to, .. } if is_mention_link(to) => Some(to),
|
|
_ => None,
|
|
})
|
|
.cloned()
|
|
.collect();
|
|
|
|
(VerificationSource::Page, endpoints)
|
|
}
|
|
|
|
fn verify_mentions<S: AsRef<str>>(
|
|
expected_link: S,
|
|
source_and_mentions: (VerificationSource, Vec<String>),
|
|
) -> VerificationStatus {
|
|
let (verification_source, mentions) = source_and_mentions;
|
|
let expected_link = expected_link.as_ref();
|
|
|
|
if mentions.len() > 0 {
|
|
// We have links that go to our endpoint. Scan links for the
|
|
// one we expect (i.e. for the target), otherwise we say
|
|
// incorrect link.
|
|
mentions
|
|
.into_iter()
|
|
.find_map(|link| {
|
|
if link == expected_link {
|
|
Some(VerificationStatus::Verified {
|
|
source: verification_source,
|
|
endpoint: link,
|
|
})
|
|
} else {
|
|
None
|
|
}
|
|
})
|
|
.unwrap_or(VerificationStatus::NotVerified(
|
|
VerificationFailureReason::MentionLinkIncorrect,
|
|
))
|
|
} else {
|
|
VerificationStatus::NotVerified(VerificationFailureReason::NoMentionLinkFound)
|
|
}
|
|
}
|
|
|
|
async fn verify_mention(target_page: &str) -> Result<VerificationStatus, GementionError> {
|
|
let url = Url::parse(&format!("gemini://{}", target_page))?;
|
|
let expected_link = Url::parse(OUR_ENDPOINT)?.join(target_page)?;
|
|
|
|
let resp = germ_request(&url).await?;
|
|
let meta = GeminiMetadata::from_string(resp.meta());
|
|
|
|
let content = resp
|
|
.content()
|
|
.as_deref()
|
|
.ok_or(GementionError::NoContentFoundForTarget)?;
|
|
|
|
let ast = GeminiAst::from_string(content);
|
|
let mentions = scan_for_mentions(meta, ast);
|
|
Ok(verify_mentions(expected_link, mentions))
|
|
}
|
|
|
|
pub(crate) async fn verify(target_page: &str) -> VerificationStatus {
|
|
let result = verify_mention(target_page)
|
|
.await
|
|
.map_err(|e| VerificationStatus::NotVerified(VerificationFailureReason::Error(e)));
|
|
|
|
match result {
|
|
Ok(status) => status,
|
|
Err(status) => status,
|
|
}
|
|
}
|