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pull_request_review.go
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pull_request_review.go
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// Copyright 2018 Palantir Technologies, Inc.
//
// 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.
package handler
import (
"context"
"encoding/json"
"github.com/google/go-github/v61/github"
"github.com/palantir/go-githubapp/githubapp"
"github.com/palantir/policy-bot/policy"
"github.com/palantir/policy-bot/policy/common"
"github.com/palantir/policy-bot/pull"
"github.com/pkg/errors"
)
type PullRequestReview struct {
Base
}
func (h *PullRequestReview) Handles() []string { return []string{"pull_request_review"} }
// Handle pull_request_review
// https://developer.github.com/v3/activity/events/types/#pullrequestreviewevent
func (h *PullRequestReview) Handle(ctx context.Context, eventType, deliveryID string, payload []byte) error {
var event github.PullRequestReviewEvent
if err := json.Unmarshal(payload, &event); err != nil {
return errors.Wrap(err, "failed to parse pull request review event payload")
}
// Ignore events triggered by policy-bot (e.g. for dismissing stale reviews)
if event.GetSender().GetLogin() == h.AppName+"[bot]" {
return nil
}
pr := event.GetPullRequest()
repo := event.GetRepo()
owner := repo.GetOwner().GetLogin()
number := event.GetPullRequest().GetNumber()
installationID := githubapp.GetInstallationIDFromEvent(&event)
ctx, logger := h.PreparePRContext(ctx, installationID, pr)
evalCtx, err := h.NewEvalContext(ctx, installationID, pull.Locator{
Owner: owner,
Repo: repo.GetName(),
Number: number,
Value: pr,
})
if err != nil {
return err
}
evaluator, err := evalCtx.ParseConfig(ctx, common.TriggerReview)
if err != nil {
return err
}
if evaluator == nil {
return nil
}
reviewState := pull.ReviewState(event.GetReview().GetState())
if !h.affectsApproval(reviewState, evalCtx.Config.Config) {
logger.Debug().Msg("Skipping evaluation because this review does not impact approval")
return nil
}
result, err := evalCtx.EvaluatePolicy(ctx, evaluator)
if err != nil {
return err
}
evalCtx.RunPostEvaluateActions(ctx, result, common.TriggerReview)
return nil
}
func (h *PullRequestReview) affectsApproval(reviewState pull.ReviewState, config *policy.Config) bool {
states := make(map[pull.ReviewState]struct{})
for _, rule := range config.ApprovalRules {
states[rule.Options.GetMethods().GithubReviewState] = struct{}{}
}
if disapproval := config.Policy.Disapproval; disapproval != nil {
states[disapproval.Options.GetDisapproveMethods().GithubReviewState] = struct{}{}
states[disapproval.Options.GetRevokeMethods().GithubReviewState] = struct{}{}
}
for state := range states {
if state == reviewState {
return true
}
}
return false
}