Update branch API endpoint to show effective branch protection. (#9031)

* Add API endpoint for displaying effective branch protection.

* Add status checks.

5 files changed, 77 insertions, 9 deletions

diff --git a/models/branches.go b/models/branches.go
index c5f227f1e5..46670b18a0 100644
--- a/models/branches.go
+++ b/models/branches.go
@@ -242,6 +242,11 @@ func (repo *Repository) GetProtectedBranches() ([]*ProtectedBranch, error) {
 	return protectedBranches, x.Find(&protectedBranches, &ProtectedBranch{RepoID: repo.ID})
 }
 
+// GetBranchProtection get the branch protection of a branch
+func (repo *Repository) GetBranchProtection(branchName string) (*ProtectedBranch, error) {
+	return GetProtectedBranchBy(repo.ID, branchName)
+}
+
 // IsProtectedBranch checks if branch is protected
 func (repo *Repository) IsProtectedBranch(branchName string, doer *User) (bool, error) {
 	if doer == nil {
diff --git a/modules/convert/convert.go b/modules/convert/convert.go
index f52ed63476..f65e4b4fe2 100644
--- a/modules/convert/convert.go
+++ b/modules/convert/convert.go
@@ -30,10 +30,28 @@ func ToEmail(email *models.EmailAddress) *api.Email {
 }
 
 // ToBranch convert a git.Commit and git.Branch to an api.Branch
-func ToBranch(repo *models.Repository, b *git.Branch, c *git.Commit) *api.Branch {
+func ToBranch(repo *models.Repository, b *git.Branch, c *git.Commit, bp *models.ProtectedBranch, user *models.User) *api.Branch {
+	if bp == nil {
+		return &api.Branch{
+			Name:                b.Name,
+			Commit:              ToCommit(repo, c),
+			Protected:           false,
+			RequiredApprovals:   0,
+			EnableStatusCheck:   false,
+			StatusCheckContexts: []string{},
+			UserCanPush:         true,
+			UserCanMerge:        true,
+		}
+	}
 	return &api.Branch{
-		Name:   b.Name,
-		Commit: ToCommit(repo, c),
+		Name:                b.Name,
+		Commit:              ToCommit(repo, c),
+		Protected:           true,
+		RequiredApprovals:   bp.RequiredApprovals,
+		EnableStatusCheck:   bp.EnableStatusCheck,
+		StatusCheckContexts: bp.StatusCheckContexts,
+		UserCanPush:         bp.CanUserPush(user.ID),
+		UserCanMerge:        bp.CanUserMerge(user.ID),
 	}
 }
 
diff --git a/modules/structs/repo_branch.go b/modules/structs/repo_branch.go
index a6ae6c1663..42bb763893 100644
--- a/modules/structs/repo_branch.go
+++ b/modules/structs/repo_branch.go
@@ -6,6 +6,12 @@ package structs
 
 // Branch represents a repository branch
 type Branch struct {
-	Name   string         `json:"name"`
-	Commit *PayloadCommit `json:"commit"`
+	Name                string         `json:"name"`
+	Commit              *PayloadCommit `json:"commit"`
+	Protected           bool           `json:"protected"`
+	RequiredApprovals   int64          `json:"required_approvals"`
+	EnableStatusCheck   bool           `json:"enable_status_check"`
+	StatusCheckContexts []string       `json:"status_check_contexts"`
+	UserCanPush         bool           `json:"user_can_push"`
+	UserCanMerge        bool           `json:"user_can_merge"`
 }
diff --git a/routers/api/v1/repo/branch.go b/routers/api/v1/repo/branch.go
index 9f6a2e6294..9745903a95 100644
--- a/routers/api/v1/repo/branch.go
+++ b/routers/api/v1/repo/branch.go
@@ -16,7 +16,7 @@ import (
 func GetBranch(ctx *context.APIContext) {
 	// swagger:operation GET /repos/{owner}/{repo}/branches/{branch} repository repoGetBranch
 	// ---
-	// summary: Retrieve a specific branch from a repository
+	// summary: Retrieve a specific branch from a repository, including its effective branch protection
 	// produces:
 	// - application/json
 	// parameters:
@@ -61,7 +61,13 @@ func GetBranch(ctx *context.APIContext) {
 		return
 	}
 
-	ctx.JSON(200, convert.ToBranch(ctx.Repo.Repository, branch, c))
+	branchProtection, err := ctx.Repo.Repository.GetBranchProtection(ctx.Repo.BranchName)
+	if err != nil {
+		ctx.Error(500, "GetBranchProtection", err)
+		return
+	}
+
+	ctx.JSON(200, convert.ToBranch(ctx.Repo.Repository, branch, c, branchProtection, ctx.User))
 }
 
 // ListBranches list all the branches of a repository
@@ -98,7 +104,12 @@ func ListBranches(ctx *context.APIContext) {
 			ctx.Error(500, "GetCommit", err)
 			return
 		}
-		apiBranches[i] = convert.ToBranch(ctx.Repo.Repository, branches[i], c)
+		branchProtection, err := ctx.Repo.Repository.GetBranchProtection(branches[i].Name)
+		if err != nil {
+			ctx.Error(500, "GetBranchProtection", err)
+			return
+		}
+		apiBranches[i] = convert.ToBranch(ctx.Repo.Repository, branches[i], c, branchProtection, ctx.User)
 	}
 
 	ctx.JSON(200, &apiBranches)
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index bebe85246c..6b424131c5 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -1492,7 +1492,7 @@
         "tags": [
           "repository"
         ],
-        "summary": "Retrieve a specific branch from a repository",
+        "summary": "Retrieve a specific branch from a repository, including its effective branch protection",
         "operationId": "repoGetBranch",
         "parameters": [
           {
@@ -7583,9 +7583,37 @@
         "commit": {
           "$ref": "#/definitions/PayloadCommit"
         },
+        "enable_status_check": {
+          "type": "boolean",
+          "x-go-name": "EnableStatusCheck"
+        },
         "name": {
           "type": "string",
           "x-go-name": "Name"
+        },
+        "protected": {
+          "type": "boolean",
+          "x-go-name": "Protected"
+        },
+        "required_approvals": {
+          "type": "integer",
+          "format": "int64",
+          "x-go-name": "RequiredApprovals"
+        },
+        "status_check_contexts": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "x-go-name": "StatusCheckContexts"
+        },
+        "user_can_merge": {
+          "type": "boolean",
+          "x-go-name": "UserCanMerge"
+        },
+        "user_can_push": {
+          "type": "boolean",
+          "x-go-name": "UserCanPush"
         }
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"