feat: [CODE-2359]: PR source branch delete/restore API (#2690)

* passed 409 for open PRs for restore branch API
* addressed review comments
* fixed lint issue
* feat: [CODE-2359]: PR source branch delete/restore API

app/api/controller/pullreq/check_list.go

@@ -20,7 +20,6 @@ import (
 	"fmt"
 	"sort"
 
-	apiauth "github.com/harness/gitness/app/api/auth"
 	"github.com/harness/gitness/app/auth"
 	"github.com/harness/gitness/app/services/protection"
 	"github.com/harness/gitness/types"
@@ -44,14 +43,9 @@ func (c *Controller) ListChecks(
 		return types.PullReqChecks{}, fmt.Errorf("failed to find pull request by number: %w", err)
 	}
 
-	isRepoOwner, err := apiauth.IsRepoOwner(ctx, c.authorizer, session, repo)
+	protectionRules, isRepoOwner, err := c.fetchRules(ctx, session, repo)
 	if err != nil {
-		return types.PullReqChecks{}, fmt.Errorf("failed to determine if user is repo owner: %w", err)
-	}
-
-	protectionRules, err := c.protectionManager.ForRepository(ctx, repo.ID)
-	if err != nil {
-		return types.PullReqChecks{}, fmt.Errorf("failed to fetch protection rules for the repository: %w", err)
+		return types.PullReqChecks{}, fmt.Errorf("failed to fetch rules: %w", err)
 	}
 
 	reqChecks, err := protectionRules.RequiredChecks(ctx, protection.RequiredChecksInput{

app/api/controller/pullreq/comment_apply_suggestions.go

@@ -20,7 +20,6 @@ import (
 	"strings"
 	"time"
 
-	apiauth "github.com/harness/gitness/app/api/auth"
 	"github.com/harness/gitness/app/api/controller"
 	"github.com/harness/gitness/app/api/usererror"
 	"github.com/harness/gitness/app/auth"
@@ -112,14 +111,9 @@ func (c *Controller) CommentApplySuggestions(
 	}
 
 	// verify branch rules
-	isRepoOwner, err := apiauth.IsRepoOwner(ctx, c.authorizer, session, repo)
+	protectionRules, isRepoOwner, err := c.fetchRules(ctx, session, repo)
 	if err != nil {
-		return CommentApplySuggestionsOutput{}, nil, fmt.Errorf("failed to determine if user is repo owner: %w", err)
-	}
-	protectionRules, err := c.protectionManager.ForRepository(ctx, repo.ID)
-	if err != nil {
-		return CommentApplySuggestionsOutput{}, nil, fmt.Errorf(
-			"failed to fetch protection rules for the repository: %w", err)
+		return CommentApplySuggestionsOutput{}, nil, fmt.Errorf("failed to fetch rules: %w", err)
 	}
 	violations, err := protectionRules.RefChangeVerify(ctx, protection.RefChangeVerifyInput{
 		Actor:       &session.Principal,

app/api/controller/pullreq/controller.go

@@ -199,6 +199,24 @@ func (c *Controller) getRepoCheckAccess(ctx context.Context,
 	return repo, nil
 }
 
+func (c *Controller) fetchRules(
+	ctx context.Context,
+	session *auth.Session,
+	repo *types.Repository,
+) (protection.Protection, bool, error) {
+	isRepoOwner, err := apiauth.IsRepoOwner(ctx, c.authorizer, session, repo)
+	if err != nil {
+		return nil, false, fmt.Errorf("failed to determine if user is repo owner: %w", err)
+	}
+
+	protectionRules, err := c.protectionManager.ForRepository(ctx, repo.ID)
+	if err != nil {
+		return nil, false, fmt.Errorf("failed to fetch protection rules for the repository: %w", err)
+	}
+
+	return protectionRules, isRepoOwner, nil
+}
+
 func (c *Controller) getCommentForPR(
 	ctx context.Context,
 	pr *types.PullReq,

app/api/controller/pullreq/delete_branch.go

@@ -0,0 +1,117 @@
+// Copyright 2023 Harness, 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 pullreq
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/harness/gitness/app/api/controller"
+	"github.com/harness/gitness/app/api/usererror"
+	"github.com/harness/gitness/app/auth"
+	"github.com/harness/gitness/app/services/protection"
+	"github.com/harness/gitness/git"
+	"github.com/harness/gitness/types"
+	"github.com/harness/gitness/types/enum"
+
+	"github.com/rs/zerolog/log"
+)
+
+// DeleteBranch deletes the source branch of a PR.
+func (c *Controller) DeleteBranch(ctx context.Context,
+	session *auth.Session,
+	repoRef string,
+	pullreqNum int64,
+	bypassRules bool,
+	dryRunRules bool,
+) (types.DeleteBranchOutput, []types.RuleViolations, error) {
+	repo, err := c.getRepoCheckAccess(ctx, session, repoRef, enum.PermissionRepoPush)
+	if err != nil {
+		return types.DeleteBranchOutput{}, nil, fmt.Errorf("failed to acquire access to repo: %w", err)
+	}
+
+	pr, err := c.pullreqStore.FindByNumber(ctx, repo.ID, pullreqNum)
+	if err != nil {
+		return types.DeleteBranchOutput{}, nil, fmt.Errorf("failed to get pull request by number: %w", err)
+	}
+	branchName := pr.SourceBranch
+
+	// make sure user isn't deleting the default branch
+	if branchName == repo.DefaultBranch {
+		return types.DeleteBranchOutput{}, nil, usererror.ErrDefaultBranchCantBeDeleted
+	}
+
+	rules, isRepoOwner, err := c.fetchRules(ctx, session, repo)
+	if err != nil {
+		return types.DeleteBranchOutput{}, nil, fmt.Errorf("failed to fetch rules: %w", err)
+	}
+	violations, err := rules.RefChangeVerify(ctx, protection.RefChangeVerifyInput{
+		Actor:       &session.Principal,
+		AllowBypass: bypassRules,
+		IsRepoOwner: isRepoOwner,
+		Repo:        repo,
+		RefAction:   protection.RefActionDelete,
+		RefType:     protection.RefTypeBranch,
+		RefNames:    []string{branchName},
+	})
+	if err != nil {
+		return types.DeleteBranchOutput{}, nil, fmt.Errorf("failed to verify protection rules: %w", err)
+	}
+
+	if dryRunRules {
+		return types.DeleteBranchOutput{
+			DryRunRulesOutput: types.DryRunRulesOutput{
+				DryRunRules:    true,
+				RuleViolations: violations,
+			},
+		}, nil, nil
+	}
+
+	if protection.IsCritical(violations) {
+		return types.DeleteBranchOutput{}, violations, nil
+	}
+
+	writeParams, err := controller.CreateRPCInternalWriteParams(ctx, c.urlProvider, session, repo)
+	if err != nil {
+		return types.DeleteBranchOutput{}, nil, fmt.Errorf("failed to create RPC write params: %w", err)
+	}
+
+	err = c.git.DeleteBranch(ctx, &git.DeleteBranchParams{
+		WriteParams: writeParams,
+		BranchName:  branchName,
+		SHA:         pr.SourceSHA,
+	})
+	if err != nil {
+		return types.DeleteBranchOutput{}, nil, err
+	}
+
+	err = func() error {
+		if pr, err = c.pullreqStore.UpdateActivitySeq(ctx, pr); err != nil {
+			return fmt.Errorf("failed to update pull request activity sequence: %w", err)
+		}
+
+		_, err := c.activityStore.CreateWithPayload(ctx, pr, session.Principal.ID,
+			&types.PullRequestActivityPayloadBranchDelete{SHA: pr.SourceSHA}, nil)
+		return err
+	}()
+	if err != nil {
+		log.Ctx(ctx).Err(err).Msgf("failed to write pull request activity for successful branch delete")
+	}
+
+	return types.DeleteBranchOutput{
+		DryRunRulesOutput: types.DryRunRulesOutput{
+			RuleViolations: violations,
+		}}, nil, nil
+}

app/api/controller/pullreq/merge.go

@@ -20,7 +20,6 @@ import (
 	"strings"
 	"time"
 
-	apiauth "github.com/harness/gitness/app/api/auth"
 	"github.com/harness/gitness/app/api/controller"
 	"github.com/harness/gitness/app/api/usererror"
 	"github.com/harness/gitness/app/auth"
@@ -182,9 +181,9 @@ func (c *Controller) Merge(
 		}
 	}
 
-	isRepoOwner, err := apiauth.IsRepoOwner(ctx, c.authorizer, session, targetRepo)
+	protectionRules, isRepoOwner, err := c.fetchRules(ctx, session, targetRepo)
 	if err != nil {
-		return nil, nil, fmt.Errorf("failed to determine if user is repo owner: %w", err)
+		return nil, nil, fmt.Errorf("failed to fetch rules: %w", err)
 	}
 
 	checkResults, err := c.checkStore.ListResults(ctx, targetRepo.ID, pr.SourceSHA)
@@ -192,11 +191,6 @@ func (c *Controller) Merge(
 		return nil, nil, fmt.Errorf("failed to list status checks: %w", err)
 	}
 
-	protectionRules, err := c.protectionManager.ForRepository(ctx, targetRepo.ID)
-	if err != nil {
-		return nil, nil, fmt.Errorf("failed to fetch protection rules for the repository: %w", err)
-	}
-
 	codeOwnerWithApproval, err := c.codeOwners.Evaluate(ctx, sourceRepo, pr, reviewers)
 	// check for error and ignore if it is codeowners file not found else throw error
 	if err != nil && !errors.Is(err, codeowners.ErrNotFound) {

app/api/controller/pullreq/restore_branch.go

@@ -0,0 +1,136 @@
+// Copyright 2023 Harness, 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 pullreq
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/harness/gitness/app/api/controller"
+	"github.com/harness/gitness/app/auth"
+	"github.com/harness/gitness/app/services/instrument"
+	"github.com/harness/gitness/app/services/protection"
+	"github.com/harness/gitness/errors"
+	"github.com/harness/gitness/git"
+	"github.com/harness/gitness/types"
+	"github.com/harness/gitness/types/enum"
+
+	"github.com/rs/zerolog/log"
+)
+
+// RestoreBranchInput used for branch restoration apis.
+type RestoreBranchInput struct {
+	DryRunRules bool `json:"dry_run_rules"`
+	BypassRules bool `json:"bypass_rules"`
+}
+
+// RestoreBranch restores branch for the merged/closed PR.
+func (c *Controller) RestoreBranch(ctx context.Context,
+	session *auth.Session,
+	repoRef string,
+	pullreqNum int64,
+	in *RestoreBranchInput,
+) (types.CreateBranchOutput, []types.RuleViolations, error) {
+	repo, err := c.getRepoCheckAccess(ctx, session, repoRef, enum.PermissionRepoPush)
+	if err != nil {
+		return types.CreateBranchOutput{}, nil, fmt.Errorf("failed to acquire access to repo: %w", err)
+	}
+
+	pr, err := c.pullreqStore.FindByNumber(ctx, repo.ID, pullreqNum)
+	if err != nil {
+		return types.CreateBranchOutput{}, nil, fmt.Errorf("failed to get pull request by number: %w", err)
+	}
+	if pr.State == enum.PullReqStateOpen {
+		return types.CreateBranchOutput{}, nil, errors.Conflict("source branch %q already exists", pr.SourceBranch)
+	}
+
+	rules, isRepoOwner, err := c.fetchRules(ctx, session, repo)
+	if err != nil {
+		return types.CreateBranchOutput{}, nil, fmt.Errorf("failed to fetch rules: %w", err)
+	}
+	violations, err := rules.RefChangeVerify(ctx, protection.RefChangeVerifyInput{
+		Actor:       &session.Principal,
+		AllowBypass: in.BypassRules,
+		IsRepoOwner: isRepoOwner,
+		Repo:        repo,
+		RefAction:   protection.RefActionCreate,
+		RefType:     protection.RefTypeBranch,
+		RefNames:    []string{pr.SourceBranch},
+	})
+	if err != nil {
+		return types.CreateBranchOutput{}, nil, fmt.Errorf("failed to verify protection rules: %w", err)
+	}
+
+	if in.DryRunRules {
+		return types.CreateBranchOutput{
+			DryRunRulesOutput: types.DryRunRulesOutput{
+				DryRunRules:    true,
+				RuleViolations: violations,
+			},
+		}, nil, nil
+	}
+
+	if protection.IsCritical(violations) {
+		return types.CreateBranchOutput{}, violations, nil
+	}
+
+	writeParams, err := controller.CreateRPCInternalWriteParams(ctx, c.urlProvider, session, repo)
+	if err != nil {
+		return types.CreateBranchOutput{}, nil, fmt.Errorf("failed to create RPC write params: %w", err)
+	}
+
+	rpcOut, err := c.git.CreateBranch(ctx, &git.CreateBranchParams{
+		WriteParams: writeParams,
+		BranchName:  pr.SourceBranch,
+		Target:      pr.SourceSHA,
+	})
+	if err != nil {
+		return types.CreateBranchOutput{}, nil, err
+	}
+	branch, err := controller.MapBranch(rpcOut.Branch)
+	if err != nil {
+		return types.CreateBranchOutput{}, nil, fmt.Errorf("failed to map branch: %w", err)
+	}
+
+	err = func() error {
+		if pr, err = c.pullreqStore.UpdateActivitySeq(ctx, pr); err != nil {
+			return fmt.Errorf("failed to update pull request activity sequence: %w", err)
+		}
+
+		_, err := c.activityStore.CreateWithPayload(ctx, pr, session.Principal.ID,
+			&types.PullRequestActivityPayloadBranchRestore{SHA: pr.SourceSHA}, nil)
+		return err
+	}()
+	if err != nil {
+		log.Ctx(ctx).Err(err).Msgf("failed to write pull request activity for successful branch restore")
+	}
+
+	err = c.instrumentation.Track(ctx, instrument.Event{
+		Type:      instrument.EventTypeCreateBranch,
+		Principal: session.Principal.ToPrincipalInfo(),
+		Path:      repo.Path,
+		Properties: map[instrument.Property]any{
+			instrument.PropertyRepositoryID:   repo.ID,
+			instrument.PropertyRepositoryName: repo.Identifier,
+		},
+	})
+	if err != nil {
+		log.Ctx(ctx).Warn().Msgf("failed to insert instrumentation record for create branch operation: %s", err)
+	}
+
+	return types.CreateBranchOutput{
+		Branch: branch,
+	}, nil, nil
+}

app/api/controller/repo/create_branch.go

@@ -102,7 +102,7 @@ func (c *Controller) CreateBranch(ctx context.Context,
 		return types.CreateBranchOutput{}, nil, err
 	}
 
-	branch, err := mapBranch(rpcOut.Branch)
+	branch, err := controller.MapBranch(rpcOut.Branch)
 	if err != nil {
 		return types.CreateBranchOutput{}, nil, fmt.Errorf("failed to map branch: %w", err)
 	}

app/api/controller/repo/get_branch.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"fmt"
 
+	"github.com/harness/gitness/app/api/controller"
 	"github.com/harness/gitness/app/auth"
 	"github.com/harness/gitness/git"
 	"github.com/harness/gitness/types"
@@ -43,7 +44,7 @@ func (c *Controller) GetBranch(ctx context.Context,
 		return nil, fmt.Errorf("failed to get branch: %w", err)
 	}
 
-	branch, err := mapBranch(rpcOut.Branch)
+	branch, err := controller.MapBranch(rpcOut.Branch)
 	if err != nil {
 		return nil, fmt.Errorf("failed to map branch: %w", err)
 	}

app/api/controller/repo/list_branches.go

@@ -52,7 +52,7 @@ func (c *Controller) ListBranches(ctx context.Context,
 
 	branches := make([]types.Branch, len(rpcOut.Branches))
 	for i := range rpcOut.Branches {
-		branches[i], err = mapBranch(rpcOut.Branches[i])
+		branches[i], err = controller.MapBranch(rpcOut.Branches[i])
 		if err != nil {
 			return nil, fmt.Errorf("failed to map branch: %w", err)
 		}
@@ -88,19 +88,3 @@ func mapToRPCSortOrder(o enum.Order) git.SortOrder {
 		return git.SortOrderDefault
 	}
 }
-
-func mapBranch(b git.Branch) (types.Branch, error) {
-	var commit *types.Commit
-	if b.Commit != nil {
-		var err error
-		commit, err = controller.MapCommit(b.Commit)
-		if err != nil {
-			return types.Branch{}, err
-		}
-	}
-	return types.Branch{
-		Name:   b.Name,
-		SHA:    b.SHA.String(),
-		Commit: commit,
-	}, nil
-}

app/api/controller/repo/rebase.go

@@ -18,7 +18,6 @@ import (
 	"context"
 	"fmt"
 
-	apiauth "github.com/harness/gitness/app/api/auth"
 	"github.com/harness/gitness/app/api/controller"
 	"github.com/harness/gitness/app/api/usererror"
 	"github.com/harness/gitness/app/auth"
@@ -71,14 +70,9 @@ func (c *Controller) Rebase(
 		return nil, nil, fmt.Errorf("failed to acquire access to repo: %w", err)
 	}
 
-	isRepoOwner, err := apiauth.IsRepoOwner(ctx, c.authorizer, session, repo)
+	protectionRules, isRepoOwner, err := c.fetchRules(ctx, session, repo)
 	if err != nil {
-		return nil, nil, fmt.Errorf("failed to determine if user is repo owner: %w", err)
-	}
-
-	protectionRules, err := c.protectionManager.ForRepository(ctx, repo.ID)
-	if err != nil {
-		return nil, nil, fmt.Errorf("failed to fetch protection rules for the repository: %w", err)
+		return nil, nil, fmt.Errorf("failed to fetch rules: %w", err)
 	}
 
 	violations, err := protectionRules.RefChangeVerify(ctx, protection.RefChangeVerifyInput{

app/api/controller/util.go

@@ -79,6 +79,22 @@ func CreateRPCInternalWriteParams(
 	return createRPCWriteParams(ctx, urlProvider, session, repo, true)
 }
 
+func MapBranch(b git.Branch) (types.Branch, error) {
+	var commit *types.Commit
+	if b.Commit != nil {
+		var err error
+		commit, err = MapCommit(b.Commit)
+		if err != nil {
+			return types.Branch{}, err
+		}
+	}
+	return types.Branch{
+		Name:   b.Name,
+		SHA:    b.SHA.String(),
+		Commit: commit,
+	}, nil
+}
+
 func MapCommit(c *git.Commit) (*types.Commit, error) {
 	if c == nil {
 		return nil, fmt.Errorf("commit is nil")

app/api/handler/pullreq/delete_branch.go

@@ -0,0 +1,67 @@
+// Copyright 2023 Harness, 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 pullreq
+
+import (
+	"net/http"
+
+	"github.com/harness/gitness/app/api/controller/pullreq"
+	"github.com/harness/gitness/app/api/render"
+	"github.com/harness/gitness/app/api/request"
+)
+
+// HandleDeleteBranch deletes the source branch of a PR.
+func HandleDeleteBranch(pullreqCtrl *pullreq.Controller) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		ctx := r.Context()
+		session, _ := request.AuthSessionFrom(ctx)
+
+		repoRef, err := request.GetRepoRefFromPath(r)
+		if err != nil {
+			render.TranslatedUserError(ctx, w, err)
+			return
+		}
+
+		pullreqNumber, err := request.GetPullReqNumberFromPath(r)
+		if err != nil {
+			render.TranslatedUserError(ctx, w, err)
+			return
+		}
+
+		bypassRules, err := request.ParseBypassRulesFromQuery(r)
+		if err != nil {
+			render.TranslatedUserError(ctx, w, err)
+			return
+		}
+
+		dryRunRules, err := request.ParseDryRunRulesFromQuery(r)
+		if err != nil {
+			render.TranslatedUserError(ctx, w, err)
+			return
+		}
+
+		out, violations, err := pullreqCtrl.DeleteBranch(ctx, session, repoRef, pullreqNumber, bypassRules, dryRunRules)
+		if err != nil {
+			render.TranslatedUserError(ctx, w, err)
+			return
+		}
+		if violations != nil {
+			render.Violations(w, violations)
+			return
+		}
+
+		render.JSON(w, http.StatusOK, out)
+	}
+}

app/api/handler/pullreq/restore_branch.go

@@ -0,0 +1,63 @@
+// Copyright 2023 Harness, 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 pullreq
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/harness/gitness/app/api/controller/pullreq"
+	"github.com/harness/gitness/app/api/render"
+	"github.com/harness/gitness/app/api/request"
+)
+
+// HandleRestoreBranch writes json-encoded branch information to the http response body.
+func HandleRestoreBranch(pullreqCtrl *pullreq.Controller) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		ctx := r.Context()
+		session, _ := request.AuthSessionFrom(ctx)
+
+		repoRef, err := request.GetRepoRefFromPath(r)
+		if err != nil {
+			render.TranslatedUserError(ctx, w, err)
+			return
+		}
+
+		pullreqNumber, err := request.GetPullReqNumberFromPath(r)
+		if err != nil {
+			render.TranslatedUserError(ctx, w, err)
+			return
+		}
+
+		in := new(pullreq.RestoreBranchInput)
+		err = json.NewDecoder(r.Body).Decode(in)
+		if err != nil {
+			render.BadRequestf(ctx, w, "Invalid request body: %s.", err)
+			return
+		}
+
+		out, violations, err := pullreqCtrl.RestoreBranch(ctx, session, repoRef, pullreqNumber, in)
+		if err != nil {
+			render.TranslatedUserError(ctx, w, err)
+			return
+		}
+		if violations != nil {
+			render.Violations(w, violations)
+			return
+		}
+
+		render.JSON(w, http.StatusCreated, out)
+	}
+}

app/api/handler/repo/create_branch.go

@@ -41,7 +41,7 @@ func HandleCreateBranch(repoCtrl *repo.Controller) http.HandlerFunc {
 			return
 		}
 
-		branch, violations, err := repoCtrl.CreateBranch(ctx, session, repoRef, in)
+		out, violations, err := repoCtrl.CreateBranch(ctx, session, repoRef, in)
 		if err != nil {
 			render.TranslatedUserError(ctx, w, err)
 			return
@@ -51,6 +51,6 @@ func HandleCreateBranch(repoCtrl *repo.Controller) http.HandlerFunc {
 			return
 		}
 
-		render.JSON(w, http.StatusCreated, branch)
+		render.JSON(w, http.StatusCreated, out)
 	}
 }

app/api/openapi/pullreq.go

@@ -702,6 +702,34 @@ func pullReqOperations(reflector *openapi3.Reflector) {
 	_ = reflector.SetJSONResponse(&opMetaData, new(usererror.Error), http.StatusNotFound)
 	_ = reflector.Spec.AddOperation(http.MethodGet, "/repos/{repo_ref}/pullreq/{pullreq_number}/metadata", opMetaData)
 
+	opRestoreBranch := openapi3.Operation{}
+	opRestoreBranch.WithTags("pullreq")
+	opRestoreBranch.WithMapOfAnything(map[string]interface{}{"operationId": "restorePullReqSourceBranch"})
+	_ = reflector.SetRequest(&opRestoreBranch, struct {
+		pullReqRequest
+		pullreq.RestoreBranchInput
+	}{}, http.MethodPost)
+	_ = reflector.SetJSONResponse(&opRestoreBranch, new(types.CreateBranchOutput), http.StatusCreated)
+	_ = reflector.SetJSONResponse(&opRestoreBranch, new(usererror.Error), http.StatusBadRequest)
+	_ = reflector.SetJSONResponse(&opRestoreBranch, new(usererror.Error), http.StatusInternalServerError)
+	_ = reflector.SetJSONResponse(&opRestoreBranch, new(usererror.Error), http.StatusUnauthorized)
+	_ = reflector.SetJSONResponse(&opRestoreBranch, new(usererror.Error), http.StatusForbidden)
+	_ = reflector.SetJSONResponse(&opRestoreBranch, new(types.RulesViolations), http.StatusUnprocessableEntity)
+	_ = reflector.Spec.AddOperation(http.MethodPost, "/repos/{repo_ref}/pullreq/{pullreq_number}/branch", opRestoreBranch)
+
+	opDeleteBranch := openapi3.Operation{}
+	opDeleteBranch.WithTags("pullreq")
+	opDeleteBranch.WithMapOfAnything(map[string]interface{}{"operationId": "deletePullReqSourceBranch"})
+	opDeleteBranch.WithParameters(queryParameterBypassRules, queryParameterDryRunRules)
+	_ = reflector.SetRequest(&opDeleteBranch, new(pullReqRequest), http.MethodDelete)
+	_ = reflector.SetJSONResponse(&opDeleteBranch, new(types.DeleteBranchOutput), http.StatusOK)
+	_ = reflector.SetJSONResponse(&opDeleteBranch, new(usererror.Error), http.StatusInternalServerError)
+	_ = reflector.SetJSONResponse(&opDeleteBranch, new(usererror.Error), http.StatusUnauthorized)
+	_ = reflector.SetJSONResponse(&opDeleteBranch, new(usererror.Error), http.StatusForbidden)
+	_ = reflector.SetJSONResponse(&opDeleteBranch, new(usererror.Error), http.StatusNotFound)
+	_ = reflector.SetJSONResponse(&opDeleteBranch, new(types.RulesViolations), http.StatusUnprocessableEntity)
+	_ = reflector.Spec.AddOperation(http.MethodDelete, "/repos/{repo_ref}/pullreq/{pullreq_number}/branch", opDeleteBranch)
+
 	fileViewAdd := openapi3.Operation{}
 	fileViewAdd.WithTags("pullreq")
 	fileViewAdd.WithMapOfAnything(map[string]interface{}{"operationId": "fileViewAddPullReq"})

app/router/api.go

@@ -649,6 +649,10 @@ func SetupPullReq(r chi.Router, pullreqCtrl *pullreq.Controller) {
 			r.Post("/merge", handlerpullreq.HandleMerge(pullreqCtrl))
 			r.Get("/commits", handlerpullreq.HandleCommits(pullreqCtrl))
 			r.Get("/metadata", handlerpullreq.HandleMetadata(pullreqCtrl))
+			r.Route("/branch", func(r chi.Router) {
+				r.Post("/", handlerpullreq.HandleRestoreBranch(pullreqCtrl))
+				r.Delete("/", handlerpullreq.HandleDeleteBranch(pullreqCtrl))
+			})
 
 			r.Route("/file-views", func(r chi.Router) {
 				r.Put("/", handlerpullreq.HandleFileViewAdd(pullreqCtrl))

types/enum/pullreq.go

@@ -87,6 +87,7 @@ const (
 	PullReqActivityTypeReviewerDelete PullReqActivityType = "reviewer-delete"
 	PullReqActivityTypeBranchUpdate   PullReqActivityType = "branch-update"
 	PullReqActivityTypeBranchDelete   PullReqActivityType = "branch-delete"
+	PullReqActivityTypeBranchRestore  PullReqActivityType = "branch-restore"
 	PullReqActivityTypeMerge          PullReqActivityType = "merge"
 	PullReqActivityTypeLabelModify    PullReqActivityType = "label-modify"
 )
@@ -100,6 +101,7 @@ var pullReqActivityTypes = sortEnum([]PullReqActivityType{
 	PullReqActivityTypeReviewerDelete,
 	PullReqActivityTypeBranchUpdate,
 	PullReqActivityTypeBranchDelete,
+	PullReqActivityTypeBranchRestore,
 	PullReqActivityTypeMerge,
 	PullReqActivityTypeLabelModify,
 })

types/pullreq_activity_payload.go

@@ -60,6 +60,7 @@ var allPullReqActivityPayloads = func(
 	func() PullReqActivityPayload { return &PullRequestActivityPayloadReviewSubmit{} },
 	func() PullReqActivityPayload { return &PullRequestActivityPayloadBranchUpdate{} },
 	func() PullReqActivityPayload { return &PullRequestActivityPayloadBranchDelete{} },
+	func() PullReqActivityPayload { return &PullRequestActivityPayloadBranchRestore{} },
 })
 
 // newPayloadForActivity returns a new payload instance for the requested activity type.
@@ -169,6 +170,14 @@ func (a *PullRequestActivityPayloadBranchDelete) ActivityType() enum.PullReqActi
 	return enum.PullReqActivityTypeBranchDelete
 }
 
+type PullRequestActivityPayloadBranchRestore struct {
+	SHA string `json:"sha"`
+}
+
+func (a *PullRequestActivityPayloadBranchRestore) ActivityType() enum.PullReqActivityType {
+	return enum.PullReqActivityTypeBranchRestore
+}
+
 type PullRequestActivityLabel struct {
 	Label         string                        `json:"label"`
 	LabelColor    enum.LabelColor               `json:"label_color"`