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// Copyright 2013 The go-github AUTHORS. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package github
import (
"context"
"encoding/json"
"errors"
"fmt"
"strings"
)
// Reference represents a GitHub reference.
type Reference struct {
Ref *string `json:"ref"`
URL *string `json:"url"`
Object *GitObject `json:"object"`
NodeID *string `json:"node_id,omitempty"`
}
func (r Reference) String() string {
return Stringify(r)
}
// GitObject represents a Git object.
type GitObject struct {
Type *string `json:"type"`
SHA *string `json:"sha"`
URL *string `json:"url"`
}
func (o GitObject) String() string {
return Stringify(o)
}
// createRefRequest represents the payload for creating a reference.
type createRefRequest struct {
Ref *string `json:"ref"`
SHA *string `json:"sha"`
}
// updateRefRequest represents the payload for updating a reference.
type updateRefRequest struct {
SHA *string `json:"sha"`
Force *bool `json:"force"`
}
// GetRef fetches a single Reference object for a given Git ref.
// If there is no exact match, GetRef will return an error.
//
// Note: The GitHub API can return multiple matches.
// If you wish to use this functionality please use the GetRefs() method.
//
// GitHub API docs: https://developer.github.com/v3/git/refs/#get-a-reference
func (s *GitService) GetRef(ctx context.Context, owner string, repo string, ref string) (*Reference, *Response, error) {
ref = strings.TrimPrefix(ref, "refs/")
u := fmt.Sprintf("repos/%v/%v/git/refs/%v", owner, repo, ref)
req, err := s.client.NewRequest("GET", u, nil)
if err != nil {
return nil, nil, err
}
r := new(Reference)
resp, err := s.client.Do(ctx, req, r)
if _, ok := err.(*json.UnmarshalTypeError); ok {
// Multiple refs, means there wasn't an exact match.
return nil, resp, errors.New("no exact match found for this ref")
} else if err != nil {
return nil, resp, err
}
return r, resp, nil
}
// GetRefs fetches a slice of Reference objects for a given Git ref.
// If there is an exact match, only that ref is returned.
// If there is no exact match, GitHub returns all refs that start with ref.
// If returned error is nil, there will be at least 1 ref returned.
// For example:
//
// "heads/featureA" -> ["refs/heads/featureA"] // Exact match, single ref is returned.
// "heads/feature" -> ["refs/heads/featureA", "refs/heads/featureB"] // All refs that start with ref.
// "heads/notexist" -> [] // Returns an error.
//
// GitHub API docs: https://developer.github.com/v3/git/refs/#get-a-reference
func (s *GitService) GetRefs(ctx context.Context, owner string, repo string, ref string) ([]*Reference, *Response, error) {
ref = strings.TrimPrefix(ref, "refs/")
u := fmt.Sprintf("repos/%v/%v/git/refs/%v", owner, repo, ref)
req, err := s.client.NewRequest("GET", u, nil)
if err != nil {
return nil, nil, err
}
var rawJSON json.RawMessage
resp, err := s.client.Do(ctx, req, &rawJSON)
if err != nil {
return nil, resp, err
}
// Prioritize the most common case: a single returned ref.
r := new(Reference)
singleUnmarshalError := json.Unmarshal(rawJSON, r)
if singleUnmarshalError == nil {
return []*Reference{r}, resp, nil
}
// Attempt to unmarshal multiple refs.
var rs []*Reference
multipleUnmarshalError := json.Unmarshal(rawJSON, &rs)
if multipleUnmarshalError == nil {
if len(rs) == 0 {
return nil, resp, fmt.Errorf("unexpected response from GitHub API: an array of refs with length 0")
}
return rs, resp, nil
}
return nil, resp, fmt.Errorf("unmarshalling failed for both single and multiple refs: %s and %s", singleUnmarshalError, multipleUnmarshalError)
}
// ReferenceListOptions specifies optional parameters to the
// GitService.ListRefs method.
type ReferenceListOptions struct {
Type string `url:"-"`
ListOptions
}
// ListRefs lists all refs in a repository.
//
// GitHub API docs: https://developer.github.com/v3/git/refs/#get-all-references
func (s *GitService) ListRefs(ctx context.Context, owner, repo string, opt *ReferenceListOptions) ([]*Reference, *Response, error) {
var u string
if opt != nil && opt.Type != "" {
u = fmt.Sprintf("repos/%v/%v/git/refs/%v", owner, repo, opt.Type)
} else {
u = fmt.Sprintf("repos/%v/%v/git/refs", owner, repo)
}
u, err := addOptions(u, opt)
if err != nil {
return nil, nil, err
}
req, err := s.client.NewRequest("GET", u, nil)
if err != nil {
return nil, nil, err
}
var rs []*Reference
resp, err := s.client.Do(ctx, req, &rs)
if err != nil {
return nil, resp, err
}
return rs, resp, nil
}
// CreateRef creates a new ref in a repository.
//
// GitHub API docs: https://developer.github.com/v3/git/refs/#create-a-reference
func (s *GitService) CreateRef(ctx context.Context, owner string, repo string, ref *Reference) (*Reference, *Response, error) {
u := fmt.Sprintf("repos/%v/%v/git/refs", owner, repo)
req, err := s.client.NewRequest("POST", u, &createRefRequest{
// back-compat with previous behavior that didn't require 'refs/' prefix
Ref: String("refs/" + strings.TrimPrefix(*ref.Ref, "refs/")),
SHA: ref.Object.SHA,
})
if err != nil {
return nil, nil, err
}
r := new(Reference)
resp, err := s.client.Do(ctx, req, r)
if err != nil {
return nil, resp, err
}
return r, resp, nil
}
// UpdateRef updates an existing ref in a repository.
//
// GitHub API docs: https://developer.github.com/v3/git/refs/#update-a-reference
func (s *GitService) UpdateRef(ctx context.Context, owner string, repo string, ref *Reference, force bool) (*Reference, *Response, error) {
refPath := strings.TrimPrefix(*ref.Ref, "refs/")
u := fmt.Sprintf("repos/%v/%v/git/refs/%v", owner, repo, refPath)
req, err := s.client.NewRequest("PATCH", u, &updateRefRequest{
SHA: ref.Object.SHA,
Force: &force,
})
if err != nil {
return nil, nil, err
}
r := new(Reference)
resp, err := s.client.Do(ctx, req, r)
if err != nil {
return nil, resp, err
}
return r, resp, nil
}
// DeleteRef deletes a ref from a repository.
//
// GitHub API docs: https://developer.github.com/v3/git/refs/#delete-a-reference
func (s *GitService) DeleteRef(ctx context.Context, owner string, repo string, ref string) (*Response, error) {
ref = strings.TrimPrefix(ref, "refs/")
u := fmt.Sprintf("repos/%v/%v/git/refs/%v", owner, repo, ref)
req, err := s.client.NewRequest("DELETE", u, nil)
if err != nil {
return nil, err
}
return s.client.Do(ctx, req, nil)
}
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