Add pull request and repository browsing

crates/app/src/activity.rs

@@ -0,0 +1,156 @@
+use gotcha_gitea::models;
+
+#[derive(Debug, Eq, PartialEq)]
+pub enum Target {
+    Commit {
+        owner: String,
+        repository: String,
+        sha: String,
+    },
+    Issue {
+        owner: String,
+        repository: String,
+        number: i64,
+    },
+    Pull {
+        owner: String,
+        repository: String,
+        number: i64,
+    },
+}
+
+pub fn target(activity: &models::Activity) -> Option<Target> {
+    use models::activity::OpType;
+
+    let (owner, repository) = activity
+        .repo
+        .as_ref()?
+        .full_name
+        .as_deref()?
+        .split_once('/')?;
+    let pair = || (owner.to_string(), repository.to_string());
+    match activity.op_type? {
+        OpType::CommitRepo | OpType::MirrorSyncPush => {
+            let (owner, repository) = pair();
+            Some(Target::Commit {
+                owner,
+                repository,
+                sha: commit_sha(activity.content.as_deref()?)?,
+            })
+        }
+        OpType::CreateIssue | OpType::CloseIssue | OpType::ReopenIssue | OpType::CommentIssue => {
+            let (owner, repository) = pair();
+            Some(Target::Issue {
+                owner,
+                repository,
+                number: issue_number(activity)?,
+            })
+        }
+        OpType::CreatePullRequest
+        | OpType::MergePullRequest
+        | OpType::AutoMergePullRequest
+        | OpType::ClosePullRequest
+        | OpType::ReopenPullRequest
+        | OpType::CommentPull
+        | OpType::ApprovePullRequest
+        | OpType::RejectPullRequest
+        | OpType::PullReviewDismissed
+        | OpType::PullRequestReadyForReview => {
+            let (owner, repository) = pair();
+            Some(Target::Pull {
+                owner,
+                repository,
+                number: issue_number(activity)?,
+            })
+        }
+        _ => None,
+    }
+}
+
+fn issue_number(activity: &models::Activity) -> Option<i64> {
+    activity
+        .comment
+        .as_ref()
+        .and_then(|comment| {
+            comment
+                .pull_request_url
+                .as_deref()
+                .or(comment.issue_url.as_deref())
+        })
+        .and_then(url_number)
+        .or_else(|| {
+            activity
+                .content
+                .as_deref()?
+                .split(|character: char| !character.is_ascii_digit())
+                .find(|part| !part.is_empty())?
+                .parse()
+                .ok()
+        })
+}
+
+fn url_number(url: &str) -> Option<i64> {
+    url.trim_end_matches('/').rsplit('/').next()?.parse().ok()
+}
+
+fn commit_sha(content: &str) -> Option<String> {
+    let payload: serde_json::Value = serde_json::from_str(content).ok()?;
+    payload.get("HeadCommit").and_then(find_sha).or_else(|| {
+        payload
+            .get("Commits")?
+            .as_array()?
+            .last()
+            .and_then(find_sha)
+    })
+}
+
+fn find_sha(value: &serde_json::Value) -> Option<String> {
+    value.as_object()?.iter().find_map(|(key, value)| {
+        (key.to_ascii_lowercase().contains("sha"))
+            .then(|| value.as_str())
+            .flatten()
+            .filter(|sha| sha.len() >= 7)
+            .map(str::to_string)
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use models::activity::OpType;
+
+    fn activity(op_type: OpType, content: &str) -> models::Activity {
+        models::Activity {
+            op_type: Some(op_type),
+            content: Some(content.into()),
+            repo: Some(Box::new(models::Repository {
+                full_name: Some("octo/demo".into()),
+                ..Default::default()
+            })),
+            ..Default::default()
+        }
+    }
+
+    #[test]
+    fn decodes_linkable_activity_targets() {
+        assert_eq!(
+            target(&activity(OpType::CreatePullRequest, "42|feature")),
+            Some(Target::Pull {
+                owner: "octo".into(),
+                repository: "demo".into(),
+                number: 42,
+            })
+        );
+        assert_eq!(
+            target(&activity(
+                OpType::CommitRepo,
+                r#"{"HeadCommit":{"Sha1":"0123456789abcdef"}}"#,
+            )),
+            Some(Target::Commit {
+                owner: "octo".into(),
+                repository: "demo".into(),
+                sha: "0123456789abcdef".into(),
+            })
+        );
+    }
+}