Hide "plan" comments

cmd/server.go

@@ -62,6 +62,7 @@ const (
 	GitlabTokenFlag            = "gitlab-token"
 	GitlabUserFlag             = "gitlab-user"
 	GitlabWebhookSecretFlag    = "gitlab-webhook-secret" // nolint: gosec
+	HidePrevPlanComments       = "hide-prev-plan-comments"
 	LogLevelFlag               = "log-level"
 	PortFlag                   = "port"
 	RepoConfigFlag             = "repo-config"
@@ -252,6 +253,11 @@ var boolFlags = map[string]boolFlag{
 		description:  "Disable \"atlantis apply\" command so a specific project/workspace/directory has to be specified for applies.",
 		defaultValue: false,
 	},
+	HidePrevPlanComments: {
+		description: "Hide previous plan comments to reduce clutter in the PR. " +
+			"VCS support is limited to: GitHub.",
+		defaultValue: false,
+	},
 	RequireApprovalFlag: {
 		description:  "Require pull requests to be \"Approved\" before allowing the apply command to be run.",
 		defaultValue: false,

go.mod

@@ -3,6 +3,7 @@ module github.com/runatlantis/atlantis
 go 1.14
 
 require (
+	github.com/Laisky/graphql v1.0.4
 	github.com/Masterminds/semver v1.4.2 // indirect
 	github.com/Masterminds/sprig v2.15.0+incompatible
 	github.com/aokoli/goutils v1.0.1 // indirect
@@ -41,6 +42,8 @@ require (
 	github.com/pelletier/go-toml v1.0.0 // indirect
 	github.com/petergtz/pegomock v2.7.0+incompatible
 	github.com/pkg/errors v0.8.0
+	github.com/shurcooL/githubv4 v0.0.0-20191127044304-8f68eb5628d0
+	github.com/shurcooL/graphql v0.0.0-20181231061246-d48a9a75455f // indirect
 	github.com/sirupsen/logrus v1.2.0 // indirect
 	github.com/spf13/afero v0.0.0-20170901052352-ee1bd8ee15a1 // indirect
 	github.com/spf13/cast v1.1.0 // indirect

runatlantis.io/docs/server-configuration.md

@@ -276,6 +276,13 @@ Values are chosen in this order:
   ```
   View help.
 
+* ### `--hide-prev-plan-comments`
+  ```bash
+  atlantis server --hide-prev-plan-comments
+  ```
+  Hide previous plan comments to declutter PRs. This is only supported in
+  GitHub currently.
+
 * ### `--log-level`
   ```bash
   atlantis server --log-level="<debug|info|warn|error>"

server/events/command_runner.go

@@ -79,6 +79,8 @@ type DefaultCommandRunner struct {
 	// this in our error message back to the user on a forked PR so they know
 	// how to enable this functionality.
 	AllowForkPRsFlag string
+	// HidePrevPlanComments will hide previous plan comments to declutter PRs.
+	HidePrevPlanComments bool
 	// SilenceForkPRErrors controls whether to comment on Fork PRs when AllowForkPRs = False
 	SilenceForkPRErrors bool
 	// SilenceForkPRErrorsFlag is the name of the flag that controls fork PR's. We use
@@ -429,6 +431,15 @@ func (c *DefaultCommandRunner) updatePull(ctx *CommandContext, command PullComma
 		ctx.Log.Warn(res.Failure)
 	}
 
+	// HidePrevPlanComments will hide old comments left from previous plan runs to reduce
+	// clutter in a pull/merge request. This will not delete the comment, since the
+	// comment trail may be useful in auditing or backtracing problems.
+	if c.HidePrevPlanComments {
+		if err := c.VCSClient.HidePrevPlanComments(ctx.BaseRepo, ctx.Pull.Num); err != nil {
+			ctx.Log.Err("unable to hide old comments: %s", err)
+		}
+	}
+
 	comment := c.MarkdownRenderer.Render(res, command.CommandName(), ctx.Log.History.String(), command.IsVerbose(), ctx.BaseRepo.VCSHost.Type)
 	if err := c.VCSClient.CreateComment(ctx.BaseRepo, ctx.Pull.Num, comment); err != nil {
 		ctx.Log.Err("unable to comment: %s", err)

server/events/vcs/azuredevops_client.go

@@ -124,7 +124,12 @@ func (g *AzureDevopsClient) CreateComment(repo models.Repo, pullNum int, comment
 	return nil
 }
 
+func (g *AzureDevopsClient) HidePrevPlanComments(repo models.Repo, pullNum int) error {
+	return nil
+}
+
 // PullIsApproved returns true if the merge request was approved by another reviewer.
+// https://docs.microsoft.com/en-us/azure/devops/repos/git/branch-policies?view=azure-devops#require-a-minimum-number-of-reviewers
 func (g *AzureDevopsClient) PullIsApproved(repo models.Repo, pull models.PullRequest) (bool, error) {
 	owner, project, repoName := SplitAzureDevopsRepoFullName(repo.FullName)
 

server/events/vcs/bitbucketcloud/client.go

@@ -100,6 +100,10 @@ func (b *Client) CreateComment(repo models.Repo, pullNum int, comment string) er
 	return err
 }
 
+func (b *Client) HidePrevPlanComments(repo models.Repo, pullNum int) error {
+	return nil
+}
+
 // PullIsApproved returns true if the merge request was approved.
 func (b *Client) PullIsApproved(repo models.Repo, pull models.PullRequest) (bool, error) {
 	path := fmt.Sprintf("%s/2.0/repositories/%s/pullrequests/%d", b.BaseURL, repo.FullName, pull.Num)

server/events/vcs/bitbucketserver/client.go

@@ -141,6 +141,10 @@ func (b *Client) CreateComment(repo models.Repo, pullNum int, comment string) er
 	return nil
 }
 
+func (b *Client) HidePrevPlanComments(repo models.Repo, pullNum int) error {
+	return nil
+}
+
 // postComment actually posts the comment. It's a helper for CreateComment().
 func (b *Client) postComment(repo models.Repo, pullNum int, comment string) error {
 	bodyBytes, err := json.Marshal(map[string]string{"text": comment})

server/events/vcs/client.go

@@ -25,6 +25,7 @@ type Client interface {
 	// relative to the repo root, e.g. parent/child/file.txt.
 	GetModifiedFiles(repo models.Repo, pull models.PullRequest) ([]string, error)
 	CreateComment(repo models.Repo, pullNum int, comment string) error
+	HidePrevPlanComments(repo models.Repo, pullNum int) error
 	PullIsApproved(repo models.Repo, pull models.PullRequest) (bool, error)
 	PullIsMergeable(repo models.Repo, pull models.PullRequest) (bool, error)
 	// UpdateStatus updates the commit status to state for pull. src is the

server/events/vcs/github_client.go

@@ -19,11 +19,13 @@ import (
 	"net/url"
 	"strings"
 
+	"github.com/runatlantis/atlantis/server/events/models"
 	"github.com/runatlantis/atlantis/server/events/vcs/common"
 
+	"github.com/Laisky/graphql"
 	"github.com/google/go-github/v28/github"
 	"github.com/pkg/errors"
-	"github.com/runatlantis/atlantis/server/events/models"
+	"github.com/shurcooL/githubv4"
 )
 
 // maxCommentLength is the maximum number of chars allowed in a single comment
@@ -32,8 +34,10 @@ const maxCommentLength = 65536
 
 // GithubClient is used to perform GitHub actions.
 type GithubClient struct {
-	client *github.Client
-	ctx    context.Context
+	user           string
+	client         *github.Client
+	v4MutateClient *graphql.Client
+	ctx            context.Context
 }
 
 // NewGithubClient returns a valid GitHub client.
@@ -43,6 +47,8 @@ func NewGithubClient(hostname string, user string, pass string) (*GithubClient,
 		Password: strings.TrimSpace(pass),
 	}
 	client := github.NewClient(tp.Client())
+	graphqlURL := "https://api.github.com/graphql"
+
 	// If we're using github.com then we don't need to do any additional configuration
 	// for the client. It we're using Github Enterprise, then we need to manually
 	// set the base url for the API.
@@ -53,11 +59,31 @@ func NewGithubClient(hostname string, user string, pass string) (*GithubClient,
 			return nil, errors.Wrapf(err, "Invalid github hostname trying to parse %s", baseURL)
 		}
 		client.BaseURL = base
+		graphqlURL = fmt.Sprintf("https://%s/graphql", hostname)
+		_, err = url.Parse(graphqlURL)
+		if err != nil {
+			return nil, errors.Wrapf(err, "Invalid GraphQL github hostname trying to parse %s", graphqlURL)
+		}
 	}
 
+	// shurcooL's githubv4 library has a client ctor, but it doesn't support schema
+	// previews, which need custom Accept headers (https://developer.github.com/v4/previews)
+	// So for now use the graphql client, since the githubv4 library was basically
+	// a simple wrapper around it. And instead of using shurcooL's graphql lib, use
+	// Laisky's, since shurcooL's doesn't support custom headers.
+	// Once the Minimize Comment schema is official, this can revert back to using
+	// shurcooL's libraries completely.
+	v4MutateClient := graphql.NewClient(
+		graphqlURL,
+		tp.Client(),
+		graphql.WithHeader("Accept", "application/vnd.github.queen-beryl-preview+json"),
+	)
+
 	return &GithubClient{
-		client: client,
-		ctx:    context.Background(),
+		user:           user,
+		client:         client,
+		v4MutateClient: v4MutateClient,
+		ctx:            context.Background(),
 	}, nil
 }
 
@@ -113,6 +139,67 @@ func (g *GithubClient) CreateComment(repo models.Repo, pullNum int, comment stri
 	return nil
 }
 
+func (g *GithubClient) HidePrevPlanComments(repo models.Repo, pullNum int) error {
+	var allComments []*github.IssueComment
+	nextPage := 0
+	for {
+		comments, resp, err := g.client.Issues.ListComments(g.ctx, repo.Owner, repo.Name, pullNum, &github.IssueListCommentsOptions{
+			Sort:        "created",
+			Direction:   "asc",
+			ListOptions: github.ListOptions{Page: nextPage},
+		})
+		if err != nil {
+			return err
+		}
+		allComments = append(allComments, comments...)
+		if resp.NextPage == 0 {
+			break
+		}
+		nextPage = resp.NextPage
+	}
+
+	for _, comment := range allComments {
+		// Using a case insensitive compare here because usernames aren't case
+		// sensitive and users may enter their atlantis users with different
+		// cases.
+		if comment.User != nil && !strings.EqualFold(comment.User.GetLogin(), g.user) {
+			continue
+		}
+		// Crude filtering: The comment templates typically include the command name
+		// somewhere in the first line. It's a bit of an assumption, but seems like
+		// a reasonable one, given we've already filtered the comments by the
+		// configured Atlantis user.
+		body := strings.Split(comment.GetBody(), "\n")
+		if len(body) == 0 {
+			continue
+		}
+		firstLine := strings.ToLower(body[0])
+		if !strings.Contains(firstLine, models.PlanCommand.String()) {
+			continue
+		}
+		var m struct {
+			MinimizeComment struct {
+				MinimizedComment struct {
+					IsMinimized       githubv4.Boolean
+					MinimizedReason   githubv4.String
+					ViewerCanMinimize githubv4.Boolean
+				}
+			} `graphql:"minimizeComment(input:$input)"`
+		}
+		input := map[string]interface{}{
+			"input": githubv4.MinimizeCommentInput{
+				Classifier: githubv4.ReportedContentClassifiersOutdated,
+				SubjectID:  comment.GetNodeID(),
+			},
+		}
+		if err := g.v4MutateClient.Mutate(g.ctx, &m, input); err != nil {
+			return errors.Wrapf(err, "minimize comment %s", comment.GetNodeID())
+		}
+	}
+
+	return nil
+}
+
 // PullIsApproved returns true if the pull request was approved.
 func (g *GithubClient) PullIsApproved(repo models.Repo, pull models.PullRequest) (bool, error) {
 	nextPage := 0