From 863d20a79d41a11ee2073d7279ba210c082f4574 Mon Sep 17 00:00:00 2001
From: projectmoon <projectmoon@agnos.is>
Date: Fri, 29 Mar 2024 12:08:25 +0100
Subject: [PATCH] Prototype first commit

---
 .gitignore  |    3 +
 Cargo.lock  | 1111 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   14 +
 src/main.rs |  152 +++++++
 4 files changed, 1280 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
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index 0000000..839d924
--- /dev/null
+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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index 0000000..9ed9502
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7258d57
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "gemention"
+version = "0.1.0"
+edition = "2021"
+
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+
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+fluffer = "4"
+germ = "0.4"
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+tokio = {version = "1.37", features = [ "full" ] }
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diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..933f0b7
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,152 @@
+use fluffer::{App, AppErr, Client, Fluff};
+use germ::ast::{Ast as GeminiAst, Node as GemtextNode};
+use germ::request::request as germ_request;
+use thiserror::Error;
+use url::Url;
+
+#[derive(Error, Debug)]
+enum GementionError {
+    #[error("No content found for target")]
+    NoContentFoundForTarget,
+
+    #[error("url parsing error: {0}")]
+    UrlParsingError(#[from] url::ParseError),
+
+    #[error("generic error: {0}")]
+    UnclassifiedError(#[from] anyhow::Error),
+}
+
+enum VerificationStatus {
+    Verified(String),
+    NotVerified(VerificationFailureReason),
+}
+
+impl ToString for VerificationStatus {
+    fn to_string(&self) -> String {
+        match self {
+            Self::Verified(url) => format!("verified: {}", url),
+            Self::NotVerified(failure) => failure.to_string(),
+        }
+    }
+}
+
+enum VerificationFailureReason {
+    /// No titan link to our endpoint exists on this page.
+    NoMentionLinkFound,
+
+    /// One or more mention links exist, but they are not to this
+    /// endpoint, or for this page.
+    MentionLinkIncorrect,
+
+    /// There was an error during the verification process.
+    Error(GementionError),
+}
+
+impl ToString for VerificationFailureReason {
+    fn to_string(&self) -> String {
+        match self {
+            Self::NoMentionLinkFound => String::from("No mention link found"),
+            Self::MentionLinkIncorrect => String::from("Mention link points to wrong target"),
+            Self::Error(err) => err.to_string(),
+        }
+    }
+}
+
+const OUR_ENDPOINT: &'static str = "titan://localhost/receive/";
+
+fn is_mention_link(gemtext_link: &str) -> Result<bool, GementionError> {
+    Ok(gemtext_link.starts_with(OUR_ENDPOINT))
+}
+
+fn scan_for_mentions(ast: GeminiAst) -> Vec<String> {
+    ast.inner()
+        .into_iter()
+        .filter_map(|node| match node {
+            GemtextNode::Link { ref to, .. } if is_mention_link(to).unwrap_or(false) => Some(to),
+            _ => None,
+        })
+        .cloned()
+        .collect()
+}
+
+fn verify_mentions<S: AsRef<str>>(expected_link: S, mentions: Vec<String>) -> VerificationStatus {
+    let expected_link = expected_link.as_ref();
+    if mentions.len() > 0 {
+        mentions
+            .into_iter()
+            .find_map(|link| {
+                if link == expected_link {
+                    Some(VerificationStatus::Verified(link))
+                } else {
+                    None
+                }
+            })
+            .unwrap_or(VerificationStatus::NotVerified(
+                VerificationFailureReason::MentionLinkIncorrect,
+            ))
+    } else {
+        VerificationStatus::NotVerified(VerificationFailureReason::NoMentionLinkFound)
+    }
+}
+
+async fn verify_mention(target: &str) -> Result<VerificationStatus, GementionError> {
+    let url = Url::parse(&format!("gemini://{}", target))?;
+    let expected_link = Url::parse(OUR_ENDPOINT)?.join(target)?;
+
+    let resp = germ_request(&url).await?;
+    let content = resp
+        .content()
+        .as_deref()
+        .ok_or(GementionError::NoContentFoundForTarget)?;
+
+    let ast = GeminiAst::from_string(content);
+    let mentions = scan_for_mentions(ast);
+    Ok(verify_mentions(expected_link, mentions))
+}
+
+// Receive a mention over Titan.
+// - Make Gemini request to see if target page supports gemention.
+// - If so, store mention in DB.
+async fn receive_mention(client: Client) -> String {
+    let titan = match client.titan {
+        Some(ref titan) => titan,
+        _ => return "".to_string(),
+    };
+
+    let target = client.parameter("target").unwrap_or("not provided");
+
+    let verified = verify_mention(&target).await;
+    let verified = match verified
+        .map(|status| status.to_string())
+        .map_err(|e| e.to_string())
+    {
+        Ok(value) => value,
+        Err(value) => value,
+    };
+
+    return format!(
+        "Target: {}\nVerification status: {}\nSize: {}\nMime: {}\nContent: {}\nToken: {}",
+        target,
+        verified,
+        titan.size,
+        titan.mime,
+        std::str::from_utf8(&titan.content).unwrap_or("[not utf8]"),
+        titan.token.as_deref().unwrap_or("[no token]"),
+    );
+}
+
+// Render comments gemtext by requesting comments for a page.
+
+// Proxy a webmention to Titan endpoint.
+
+#[tokio::main]
+async fn main() -> Result<(), AppErr> {
+    App::default()
+        .titan("/receive/*target", receive_mention, 20_000)
+        .route("/", |_| async {
+            "# Welcome\n=> titan://localhost/receive/agnos.is/posts/webmentions-test.gmi Receive Mention"
+        })
+        //.route("/{*p}", |_| async { "hello" })
+        .run()
+        .await
+}