Implement labeling issues

Cargo.lock

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Cargo.toml

@@ -5,3 +5,17 @@ authors = ["Mark Rousskov <mark.simulacrum@gmail.com>"]
 edition = "2018"
 
 [dependencies]
+rocket = "0.4"
+rocket_contrib = "0.4"
+serde_json = "1"
+openssl = "0.10"
+dotenv = "0.13"
+reqwest = "0.9"
+regex = "1"
+lazy_static = "1"
+log = "0.4"
+failure = "0.1"
+
+[dependencies.serde]
+version = "1"
+features = ["derive"]

LICENSE-APACHE

@@ -0,0 +1,201 @@
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+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
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+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
+   except as required for reasonable and customary use in describing the
+   origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
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+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
+   risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
+   result of this License or out of the use or inability to use the
+   Work (including but not limited to damages for loss of goodwill,
+   work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses), even if such Contributor
+   has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+   the Work or Derivative Works thereof, You may choose to offer,
+   and charge a fee for, acceptance of support, warranty, indemnity,
+   or other liability obligations and/or rights consistent with this
+   License. However, in accepting such obligations, You may act only
+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
+   replaced with your own identifying information. (Don't include
+   the brackets!)  The text should be enclosed in the appropriate
+   comment syntax for the file format. We also recommend that a
+   file or class name and description of purpose be included on the
+   same "printed page" as the copyright notice for easier
+   identification within third-party archives.
+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

LICENSE-MIT

@@ -0,0 +1,25 @@
+Copyright (c) 2019 The Rust Project Developers
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

README.md

@@ -0,0 +1,14 @@
+# Triagebot
+
+This is the triage and team assistance bot for the rust-lang organization.
+
+## Installation
+
+The `GITHUB_WEBHOOK_SECRET` and `GITHUB_API_TOKEN` environment variables need to be set.
+
+## License
+
+Triagebot is distributed under the terms of both the MIT license and the
+Apache License (Version 2.0).
+
+See [LICENSE-APACHE](LICENSE-APACHE) and [LICENSE-MIT](LICENSE-MIT) for details.

src/github.rs

@@ -0,0 +1,107 @@
+use failure::{Error, ResultExt};
+use reqwest::header::USER_AGENT;
+use reqwest::Error as HttpError;
+use reqwest::{Client, RequestBuilder, Response};
+
+#[derive(Debug, serde::Deserialize)]
+pub struct User {
+    pub login: String,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct Label {
+    pub name: String,
+}
+
+#[derive(Debug, serde::Deserialize)]
+pub struct Issue {
+    number: u64,
+    title: String,
+    user: User,
+    labels: Vec<Label>,
+    assignees: Vec<User>,
+    repository: Repository,
+}
+
+#[derive(Debug, serde::Deserialize)]
+pub struct Repository {
+    // API URL
+    pub url: String,
+}
+
+#[derive(Debug, serde::Deserialize)]
+pub struct Comment {
+    pub body: String,
+    pub user: User,
+}
+
+impl Issue {
+    pub fn set_labels(&mut self, client: &GithubClient, labels: Vec<Label>) -> Result<(), Error> {
+        // PUT /repos/:owner/:repo/issues/:number/labels
+        // repo_url = https://api.github.com/repos/Codertocat/Hello-World
+        // Might need `Accept: application/vnd.github.symmetra-preview+json` for emoji and descriptions
+        let url = format!(
+            "{repo_url}/issues/{number}/labels",
+            repo_url = self.repository.url,
+            number = self.number
+        );
+
+        #[derive(serde::Serialize)]
+        struct LabelsReq {
+            labels: Vec<String>,
+        }
+        client
+            .put(&url)
+            .json(&LabelsReq {
+                labels: labels.iter().map(|l| l.name.clone()).collect(),
+            })
+            .send_req()
+            .context("failed to set labels")?;
+
+        self.labels = labels;
+        Ok(())
+    }
+
+    pub fn labels(&self) -> &[Label] {
+        &self.labels
+    }
+
+    pub fn add_assignee(&mut self, client: &GithubClient, user: &str) -> Result<(), Error> {
+        unimplemented!()
+    }
+}
+
+trait RequestSend: Sized {
+    fn configure(self, g: &GithubClient) -> Self;
+    fn send_req(self) -> Result<Response, HttpError>;
+    fn send(self) {} // cause conflicts to force users to `send_req`
+}
+
+impl RequestSend for RequestBuilder {
+    fn configure(self, g: &GithubClient) -> RequestBuilder {
+        self.header(USER_AGENT, "rust-lang-triagebot")
+            .basic_auth("rust-highfive", Some(&g.token))
+    }
+
+    fn send_req(self) -> Result<Response, HttpError> {
+        match self.send() {
+            Ok(r) => r.error_for_status(),
+            Err(e) => Err(e),
+        }
+    }
+}
+
+pub struct GithubClient {
+    token: String,
+    client: Client,
+}
+
+impl GithubClient {
+    pub fn new(c: Client, token: String) -> Self {
+        GithubClient { client: c, token }
+    }
+
+    fn put(&self, url: &str) -> RequestBuilder {
+        self.client.put(url).configure(self)
+    }
+}

src/main.rs

@@ -1,3 +1,309 @@
+#![feature(proc_macro_hygiene, decl_macro)]
+
+#[macro_use]
+extern crate rocket;
+
+use failure::Error;
+use lazy_static::lazy_static;
+use openssl::hash::MessageDigest;
+use openssl::memcmp;
+use openssl::pkey::PKey;
+use openssl::sign::Signer;
+use regex::Regex;
+use reqwest::Client;
+use rocket::data::{self, FromDataSimple};
+use rocket::request;
+use rocket::State;
+use rocket::{http::Status, Data, Outcome, Request};
+use std::env;
+use std::io::Read;
+
+mod github;
+mod permissions;
+
+static BOT_USER_NAME: &str = "rust-highfive";
+
+use github::{Comment, GithubClient, Issue, Label};
+use permissions::{Permissions, Team};
+
+#[derive(PartialEq, Eq, Debug, serde::Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum IssueCommentAction {
+    Created,
+    Edited,
+    Deleted,
+}
+
+#[derive(Debug, serde::Deserialize)]
+struct IssueCommentEvent {
+    action: IssueCommentAction,
+    issue: Issue,
+    comment: Comment,
+}
+
+impl IssueCommentEvent {
+    /// Purpose: Allow any user to modify issue labels on GitHub via comments.
+    ///
+    /// The current syntax allows adding labels (+labelname or just labelname) following the
+    /// `label:` prefix. Users can also remove labels with -labelname.
+    ///
+    /// No verification is currently attempted of the added labels (only currently present labels
+    /// can be removed). XXX: How does this affect users workflow?
+    ///
+    /// There will be no feedback beyond the label change to reduce notification noise.
+    fn handle_labels(&mut self, g: &GithubClient) -> Result<(), Error> {
+        lazy_static! {
+            static ref LABEL_RE: Regex = Regex::new(r#"\blabel: (\S+\s*)+"#).unwrap();
+        }
+
+        let mut issue_labels = self.issue.labels().to_owned();
+
+        for label_block in LABEL_RE.find_iter(&self.comment.body) {
+            let label_block = &label_block.as_str()["label: ".len()..]; // guaranteed to start with this
+            for label in label_block.split_whitespace() {
+                if label.starts_with('-') {
+                    if let Some(label) = issue_labels.iter().position(|el| el.name == &label[1..]) {
+                        issue_labels.remove(label);
+                    } else {
+                        // do nothing, if the user attempts to remove a label that's not currently
+                        // set simply skip it
+                    }
+                } else if label.starts_with('+') {
+                    // add this label, but without the +
+                    issue_labels.push(Label {
+                        name: label[1..].to_string(),
+                    });
+                } else {
+                    // add this label (literally)
+                    issue_labels.push(Label {
+                        name: label.to_string(),
+                    });
+                }
+            }
+        }
+
+        self.issue.set_labels(&g, issue_labels)
+    }
+
+    /// Permit assignment of any user to issues, without requiring "write" access to the repository.
+    ///
+    /// It is unknown which approach is needed here: we may need to fake-assign ourselves and add a
+    /// 'claimed by' section to the top-level comment. That would be very unideal.
+    ///
+    /// The ideal workflow here is that the user is added to a read-only team with no access to the
+    /// repository and immediately thereafter assigned to the issue.
+    ///
+    /// Such assigned issues should also be placed in a queue to ensure that the user remains
+    /// active; the assigned user will be asked for a status report every 2 weeks (XXX: timing).
+    ///
+    /// If we're intending to ask for a status report but no comments from the assigned user have
+    /// been given for the past 2 weeks, the bot will de-assign the user. They can once more claim
+    /// the issue if necessary.
+    ///
+    /// Assign users with `assign: @gh-user` or `@bot claim` (self-claim).
+    fn handle_assign(&mut self, g: &GithubClient) -> Result<(), Error> {
+        lazy_static! {
+            static ref RE_ASSIGN: Regex = Regex::new(r"\bassign: @(\S+)").unwrap();
+            static ref RE_CLAIM: Regex =
+                Regex::new(&format!(r"\b@{} claim\b", BOT_USER_NAME)).unwrap();
+        }
+
+        // XXX: Handle updates to the comment specially to avoid double-queueing or double-assigning
+        // and other edge cases.
+
+        if RE_CLAIM.is_match(&self.comment.body) {
+            self.issue.add_assignee(g, &self.comment.user.login)?;
+        } else {
+            if let Some(capture) = RE_ASSIGN.captures(&self.comment.body) {
+                self.issue.add_assignee(g, &capture[1])?;
+            }
+        }
+
+        // TODO: Enqueue a check-in in two weeks.
+        // TODO: Post a comment documenting the biweekly check-in? Maybe just give them two weeks
+        //       without any commentary from us.
+        // TODO: How do we handle `claim`/`assign:` if someone's already assigned? Error out?
+
+        Ok(())
+    }
+
+    /// Automates creating tracking issues.
+    ///
+    /// This command is initially restricted to members of Rust teams.
+    ///
+    /// This command is rare, and somewhat high-impact, so it requires the `@bot` prefix.
+    /// The syntax for creating a tracking issue follows. Note that only the libs and lang teams are
+    /// currently supported; it's presumed that the other teams may want significantly different
+    /// issue formats, so only these two are supported for the time being.
+    ///
+    /// `@bot tracking-issue create feature="<short feature description>" team=[libs|lang]`
+    ///
+    /// This creates the tracking issue, though it's likely that the invokee will want to edit its
+    /// body/title.
+    ///
+    /// Long-term, this will also create a thread on internals and lock the tracking issue,
+    /// directing commentary to the thread, but for the time being we limit the scope of work as
+    /// well as project impact.
+    fn handle_create_tracking_issue(
+        &mut self,
+        g: &GithubClient,
+        auth: &Permissions,
+    ) -> Result<(), Error> {
+        lazy_static! {
+            static ref RE_TRACKING: Regex = Regex::new(&format!(
+                r#"\b@{} tracking-issue create feature=("[^"]+|\S+) team=(libs|lang)"#,
+                BOT_USER_NAME,
+            ))
+            .unwrap();
+        }
+
+        // Skip this event if the comment is edited or deleted.
+        if self.action != IssueCommentAction::Created {
+            return Ok(());
+        }
+
+        let feature;
+        let team;
+
+        if let Some(captures) = RE_TRACKING.captures(&self.comment.body) {
+            feature = captures.get(1).unwrap();
+            team = captures.get(2).unwrap().as_str().parse::<Team>()?;
+        } else {
+            // no tracking issue creation comment
+            return Ok(());
+        }
+
+        // * Create tracking issue (C-tracking-issue, T-{team})
+        // * Post comment with link to issue and suggestion on what to do next
+
+        unimplemented!()
+    }
+
+    /// Links issues to tracking issues.
+    ///
+    /// We verify that the tracking issue listed is in fact a tracking issue (i.e., has the
+    /// C-tracking-issue label). Next, the tracking issue's top comment is updated with a link and
+    /// title of the issue linked as a checkbox in the bugs list.
+    ///
+    /// We also label the issue with `tracked-bug`.
+    ///
+    /// TODO: Check the checkbox in the tracking issue when `tracked-bug` is closed.
+    ///
+    /// Syntax: `link: #xxx`
+    fn handle_link_tracking_issue(&mut self, g: &GithubClient) -> Result<(), Error> {
+        unimplemented!()
+    }
+
+    fn run(mut self, g: &GithubClient, permissions: &Permissions) -> Result<(), Error> {
+        // Don't do anything on deleted comments.
+        //
+        // XXX: Should we attempt to roll back the action instead?
+        if self.action == IssueCommentAction::Deleted {
+            return Ok(());
+        }
+        self.handle_labels(g)?;
+        Ok(())
+    }
+}
+
+enum Event {
+    IssueComment,
+    Other,
+}
+
+impl<'a, 'r> request::FromRequest<'a, 'r> for Event {
+    type Error = String;
+    fn from_request(req: &'a Request<'r>) -> request::Outcome<Self, Self::Error> {
+        let ev = if let Some(ev) = req.headers().get_one("X-GitHub-Event") {
+            ev
+        } else {
+            return Outcome::Failure((Status::BadRequest, format!("Needs a X-GitHub-Event")));
+        };
+        let ev = match ev {
+            "issue_comment" => Event::IssueComment,
+            _ => Event::Other,
+        };
+        Outcome::Success(ev)
+    }
+}
+
+struct SignedPayload(Vec<u8>);
+
+impl FromDataSimple for SignedPayload {
+    type Error = String;
+    fn from_data(req: &Request, data: Data) -> data::Outcome<Self, Self::Error> {
+        let signature = match req.headers().get_one("X-Hub-Signature") {
+            Some(s) => s,
+            None => {
+                return Outcome::Failure((
+                    Status::Unauthorized,
+                    format!("Unauthorized, no signature"),
+                ));
+            }
+        };
+
+        let mut stream = data.open().take(1024 * 1024 * 5); // 5 Megabytes
+        let mut buf = Vec::new();
+        if let Err(err) = stream.read_to_end(&mut buf) {
+            return Outcome::Failure((
+                Status::InternalServerError,
+                format!("failed to read request body to string: {:?}", err),
+            ));
+        }
+
+        let key = PKey::hmac(env::var("GITHUB_WEBHOOK_SECRET").unwrap().as_bytes()).unwrap();
+        let mut signer = Signer::new(MessageDigest::sha1(), &key).unwrap();
+        signer.update(&buf).unwrap();
+        let hmac = signer.sign_to_vec().unwrap();
+
+        if !memcmp::eq(&hmac, signature.as_bytes()) {
+            return Outcome::Failure((Status::Unauthorized, format!("HMAC not correct")));
+        }
+
+        Outcome::Success(SignedPayload(buf))
+    }
+}
+
+impl SignedPayload {
+    fn deserialize<T: serde::de::DeserializeOwned>(self) -> Result<T, serde_json::Error> {
+        serde_json::from_slice(&self.0)
+    }
+}
+
+#[post("/github-hoook", data = "<payload>")]
+fn webhook(
+    event: Event,
+    payload: SignedPayload,
+    client: State<GithubClient>,
+    permissions: State<Permissions>,
+) -> Result<(), String> {
+    match event {
+        Event::IssueComment => payload
+            .deserialize::<IssueCommentEvent>()
+            .map_err(|e| format!("IssueCommentEvent failed to deserialize: {:?}", e))?
+            .run(&client, &permissions)
+            .map_err(|e| e.to_string())?,
+        // Other events need not be handled
+        Event::Other => {}
+    }
+    Ok(())
+}
+
+#[catch(404)]
+fn not_found(_: &Request) -> &'static str {
+    "Not Found"
+}
+
 fn main() {
-    println!("Hello, world!");
+    dotenv::dotenv().ok();
+    let client = Client::new();
+    rocket::ignite()
+        .manage(GithubClient::new(
+            client.clone(),
+            env::var("GITHUB_API_TOKEN").unwrap(),
+        ))
+        .manage(Permissions::new(client))
+        .mount("/", routes![webhook])
+        .register(catchers![not_found])
+        .launch();
 }

src/permissions.rs

@@ -0,0 +1,48 @@
+use failure::Error;
+use reqwest::Client;
+use std::str::FromStr;
+
+pub struct Permissions {
+    client: Client,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum Team {
+    Libs,
+    Compiler,
+    Lang,
+}
+
+impl Team {
+    pub fn label(&self) -> crate::github::Label {
+        match self {
+            Team::Libs => crate::github::Label {
+                name: String::from("T-libs"),
+            },
+            Team::Compiler => crate::github::Label {
+                name: String::from("T-compiler"),
+            },
+            Team::Lang => crate::github::Label {
+                name: String::from("T-lang"),
+            },
+        }
+    }
+}
+
+impl FromStr for Team {
+    type Err = Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(match s {
+            "libs" => Team::Libs,
+            "compiler" => Team::Compiler,
+            "lang" => Team::Lang,
+            _ => failure::bail!("unknown team: {:?}", s),
+        })
+    }
+}
+
+impl Permissions {
+    pub fn new(client: Client) -> Permissions {
+        Permissions { client }
+    }
+}