Implement git refs API for listing references (branches, tags and other) (#5354)

* Inital routes to git refs api

* Git refs API implementation

* Update swagger

* Fix copyright

* Make swagger happy add basic test

* Fix test

* Fix test again :)

4 files changed, 154 insertions, 5 deletions

diff --git a/vendor/code.gitea.io/git/ref.go b/vendor/code.gitea.io/git/ref.go
new file mode 100644
index 0000000000..67b56ac999
--- /dev/null
+++ b/vendor/code.gitea.io/git/ref.go
@@ -0,0 +1,18 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package git
+
+// Reference represents a Git ref.
+type Reference struct {
+	Name   string
+	repo   *Repository
+	Object SHA1 // The id of this commit object
+	Type   string
+}
+
+// Commit return the commit of the reference
+func (ref *Reference) Commit() (*Commit, error) {
+	return ref.repo.getCommit(ref.Object)
+}
diff --git a/vendor/code.gitea.io/git/repo_branch.go b/vendor/code.gitea.io/git/repo_branch.go
index 3b50eece14..6414abbec5 100644
--- a/vendor/code.gitea.io/git/repo_branch.go
+++ b/vendor/code.gitea.io/git/repo_branch.go
@@ -1,4 +1,5 @@
 // Copyright 2015 The Gogs Authors. All rights reserved.
+// Copyright 2018 The Gitea Authors. All rights reserved.
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
 
@@ -7,6 +8,9 @@ package git
 import (
 	"fmt"
 	"strings"
+
+	"gopkg.in/src-d/go-git.v4"
+	"gopkg.in/src-d/go-git.v4/plumbing"
 )
 
 // BranchPrefix base dir of the branch information file store on git
@@ -60,16 +64,23 @@ func (repo *Repository) SetDefaultBranch(name string) error {
 
 // GetBranches returns all branches of the repository.
 func (repo *Repository) GetBranches() ([]string, error) {
-	stdout, err := NewCommand("for-each-ref", "--format=%(refname)", BranchPrefix).RunInDir(repo.Path)
+	r, err := git.PlainOpen(repo.Path)
 	if err != nil {
 		return nil, err
 	}
 
-	refs := strings.Split(stdout, "\n")
-	branches := make([]string, len(refs)-1)
-	for i, ref := range refs[:len(refs)-1] {
-		branches[i] = strings.TrimPrefix(ref, BranchPrefix)
+	branchIter, err := r.Branches()
+	if err != nil {
+		return nil, err
 	}
+	branches := make([]string, 0)
+	if err = branchIter.ForEach(func(branch *plumbing.Reference) error {
+		branches = append(branches, branch.Name().Short())
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
 	return branches, nil
 }
 
diff --git a/vendor/code.gitea.io/git/repo_ref.go b/vendor/code.gitea.io/git/repo_ref.go
new file mode 100644
index 0000000000..e1ab46e090
--- /dev/null
+++ b/vendor/code.gitea.io/git/repo_ref.go
@@ -0,0 +1,51 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package git
+
+import (
+	"strings"
+
+	"gopkg.in/src-d/go-git.v4"
+	"gopkg.in/src-d/go-git.v4/plumbing"
+)
+
+// GetRefs returns all references of the repository.
+func (repo *Repository) GetRefs() ([]*Reference, error) {
+	return repo.GetRefsFiltered("")
+}
+
+// GetRefsFiltered returns all references of the repository that matches patterm exactly or starting with.
+func (repo *Repository) GetRefsFiltered(pattern string) ([]*Reference, error) {
+	r, err := git.PlainOpen(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+
+	refsIter, err := r.References()
+	if err != nil {
+		return nil, err
+	}
+	refs := make([]*Reference, 0)
+	if err = refsIter.ForEach(func(ref *plumbing.Reference) error {
+		if ref.Name() != plumbing.HEAD && !ref.Name().IsRemote() &&
+			(pattern == "" || strings.HasPrefix(ref.Name().String(), pattern)) {
+			r := &Reference{
+				Name:   ref.Name().String(),
+				Object: SHA1(ref.Hash()),
+				Type:   string(ObjectCommit),
+				repo:   repo,
+			}
+			if ref.Name().IsTag() {
+				r.Type = string(ObjectTag)
+			}
+			refs = append(refs, r)
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	return refs, nil
+}
diff --git a/vendor/code.gitea.io/sdk/gitea/repo_refs.go b/vendor/code.gitea.io/sdk/gitea/repo_refs.go
new file mode 100644
index 0000000000..b946a10026
--- /dev/null
+++ b/vendor/code.gitea.io/sdk/gitea/repo_refs.go
@@ -0,0 +1,69 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package gitea
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"strings"
+)
+
+// Reference represents a Git reference.
+type Reference struct {
+	Ref    string     `json:"ref"`
+	URL    string     `json:"url"`
+	Object *GitObject `json:"object"`
+}
+
+// GitObject represents a Git object.
+type GitObject struct {
+	Type string `json:"type"`
+	SHA  string `json:"sha"`
+	URL  string `json:"url"`
+}
+
+// GetRepoRef get one ref's information of one repository
+func (c *Client) GetRepoRef(user, repo, ref string) (*Reference, error) {
+	ref = strings.TrimPrefix(ref, "refs/")
+	r := new(Reference)
+	err := c.getParsedResponse("GET", fmt.Sprintf("/repos/%s/%s/git/refs/%s", user, repo, ref), nil, nil, &r)
+	if _, ok := err.(*json.UnmarshalTypeError); ok {
+		// Multiple refs
+		return nil, errors.New("no exact match found for this ref")
+	} else if err != nil {
+		return nil, err
+	}
+
+	return r, nil
+}
+
+// GetRepoRefs get list of ref's information of one repository
+func (c *Client) GetRepoRefs(user, repo, ref string) ([]*Reference, error) {
+	ref = strings.TrimPrefix(ref, "refs/")
+	resp, err := c.getResponse("GET", fmt.Sprintf("/repos/%s/%s/git/refs/%s", user, repo, ref), nil, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// Attempt to unmarshal single returned ref.
+	r := new(Reference)
+	refErr := json.Unmarshal(resp, r)
+	if refErr == nil {
+		return []*Reference{r}, nil
+	}
+
+	// Attempt to unmarshal multiple refs.
+	var rs []*Reference
+	refsErr := json.Unmarshal(resp, &rs)
+	if refsErr == nil {
+		if len(rs) == 0 {
+			return nil, errors.New("unexpected response: an array of refs with length 0")
+		}
+		return rs, nil
+	}
+
+	return nil, fmt.Errorf("unmarshalling failed for both single and multiple refs: %s and %s", refErr, refsErr)
+}