auth: add new authentication source: GitHub, including GitHub Enterprise (#5340)

* Add new Authentication Source: GitHub, including GitHub Enterprise.

* Add vendor dependencies.

1 files changed, 266 insertions, 0 deletions

diff --git a/vendor/github.com/google/go-github/github/repos_contents.go b/vendor/github.com/google/go-github/github/repos_contents.go
new file mode 100644
index 00000000..ffb56b90
--- /dev/null
+++ b/vendor/github.com/google/go-github/github/repos_contents.go
@@ -0,0 +1,266 @@
+// 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.
+
+// Repository contents API methods.
+// GitHub API docs: https://developer.github.com/v3/repos/contents/
+
+package github
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"path"
+)
+
+// RepositoryContent represents a file or directory in a github repository.
+type RepositoryContent struct {
+	Type     *string `json:"type,omitempty"`
+	Encoding *string `json:"encoding,omitempty"`
+	Size     *int    `json:"size,omitempty"`
+	Name     *string `json:"name,omitempty"`
+	Path     *string `json:"path,omitempty"`
+	// Content contains the actual file content, which may be encoded.
+	// Callers should call GetContent which will decode the content if
+	// necessary.
+	Content     *string `json:"content,omitempty"`
+	SHA         *string `json:"sha,omitempty"`
+	URL         *string `json:"url,omitempty"`
+	GitURL      *string `json:"git_url,omitempty"`
+	HTMLURL     *string `json:"html_url,omitempty"`
+	DownloadURL *string `json:"download_url,omitempty"`
+}
+
+// RepositoryContentResponse holds the parsed response from CreateFile, UpdateFile, and DeleteFile.
+type RepositoryContentResponse struct {
+	Content *RepositoryContent `json:"content,omitempty"`
+	Commit  `json:"commit,omitempty"`
+}
+
+// RepositoryContentFileOptions specifies optional parameters for CreateFile, UpdateFile, and DeleteFile.
+type RepositoryContentFileOptions struct {
+	Message   *string       `json:"message,omitempty"`
+	Content   []byte        `json:"content,omitempty"` // unencoded
+	SHA       *string       `json:"sha,omitempty"`
+	Branch    *string       `json:"branch,omitempty"`
+	Author    *CommitAuthor `json:"author,omitempty"`
+	Committer *CommitAuthor `json:"committer,omitempty"`
+}
+
+// RepositoryContentGetOptions represents an optional ref parameter, which can be a SHA,
+// branch, or tag
+type RepositoryContentGetOptions struct {
+	Ref string `url:"ref,omitempty"`
+}
+
+// String converts RepositoryContent to a string. It's primarily for testing.
+func (r RepositoryContent) String() string {
+	return Stringify(r)
+}
+
+// GetContent returns the content of r, decoding it if necessary.
+func (r *RepositoryContent) GetContent() (string, error) {
+	var encoding string
+	if r.Encoding != nil {
+		encoding = *r.Encoding
+	}
+
+	switch encoding {
+	case "base64":
+		c, err := base64.StdEncoding.DecodeString(*r.Content)
+		return string(c), err
+	case "":
+		if r.Content == nil {
+			return "", nil
+		}
+		return *r.Content, nil
+	default:
+		return "", fmt.Errorf("unsupported content encoding: %v", encoding)
+	}
+}
+
+// GetReadme gets the Readme file for the repository.
+//
+// GitHub API docs: https://developer.github.com/v3/repos/contents/#get-the-readme
+func (s *RepositoriesService) GetReadme(ctx context.Context, owner, repo string, opt *RepositoryContentGetOptions) (*RepositoryContent, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/readme", 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
+	}
+	readme := new(RepositoryContent)
+	resp, err := s.client.Do(ctx, req, readme)
+	if err != nil {
+		return nil, resp, err
+	}
+	return readme, resp, nil
+}
+
+// DownloadContents returns an io.ReadCloser that reads the contents of the
+// specified file. This function will work with files of any size, as opposed
+// to GetContents which is limited to 1 Mb files. It is the caller's
+// responsibility to close the ReadCloser.
+func (s *RepositoriesService) DownloadContents(ctx context.Context, owner, repo, filepath string, opt *RepositoryContentGetOptions) (io.ReadCloser, error) {
+	dir := path.Dir(filepath)
+	filename := path.Base(filepath)
+	_, dirContents, _, err := s.GetContents(ctx, owner, repo, dir, opt)
+	if err != nil {
+		return nil, err
+	}
+	for _, contents := range dirContents {
+		if *contents.Name == filename {
+			if contents.DownloadURL == nil || *contents.DownloadURL == "" {
+				return nil, fmt.Errorf("No download link found for %s", filepath)
+			}
+			resp, err := s.client.client.Get(*contents.DownloadURL)
+			if err != nil {
+				return nil, err
+			}
+			return resp.Body, nil
+		}
+	}
+	return nil, fmt.Errorf("No file named %s found in %s", filename, dir)
+}
+
+// GetContents can return either the metadata and content of a single file
+// (when path references a file) or the metadata of all the files and/or
+// subdirectories of a directory (when path references a directory). To make it
+// easy to distinguish between both result types and to mimic the API as much
+// as possible, both result types will be returned but only one will contain a
+// value and the other will be nil.
+//
+// GitHub API docs: https://developer.github.com/v3/repos/contents/#get-contents
+func (s *RepositoriesService) GetContents(ctx context.Context, owner, repo, path string, opt *RepositoryContentGetOptions) (fileContent *RepositoryContent, directoryContent []*RepositoryContent, resp *Response, err error) {
+	escapedPath := (&url.URL{Path: path}).String()
+	u := fmt.Sprintf("repos/%s/%s/contents/%s", owner, repo, escapedPath)
+	u, err = addOptions(u, opt)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	var rawJSON json.RawMessage
+	resp, err = s.client.Do(ctx, req, &rawJSON)
+	if err != nil {
+		return nil, nil, resp, err
+	}
+	fileUnmarshalError := json.Unmarshal(rawJSON, &fileContent)
+	if fileUnmarshalError == nil {
+		return fileContent, nil, resp, nil
+	}
+	directoryUnmarshalError := json.Unmarshal(rawJSON, &directoryContent)
+	if directoryUnmarshalError == nil {
+		return nil, directoryContent, resp, nil
+	}
+	return nil, nil, resp, fmt.Errorf("unmarshalling failed for both file and directory content: %s and %s", fileUnmarshalError, directoryUnmarshalError)
+}
+
+// CreateFile creates a new file in a repository at the given path and returns
+// the commit and file metadata.
+//
+// GitHub API docs: https://developer.github.com/v3/repos/contents/#create-a-file
+func (s *RepositoriesService) CreateFile(ctx context.Context, owner, repo, path string, opt *RepositoryContentFileOptions) (*RepositoryContentResponse, *Response, error) {
+	u := fmt.Sprintf("repos/%s/%s/contents/%s", owner, repo, path)
+	req, err := s.client.NewRequest("PUT", u, opt)
+	if err != nil {
+		return nil, nil, err
+	}
+	createResponse := new(RepositoryContentResponse)
+	resp, err := s.client.Do(ctx, req, createResponse)
+	if err != nil {
+		return nil, resp, err
+	}
+	return createResponse, resp, nil
+}
+
+// UpdateFile updates a file in a repository at the given path and returns the
+// commit and file metadata. Requires the blob SHA of the file being updated.
+//
+// GitHub API docs: https://developer.github.com/v3/repos/contents/#update-a-file
+func (s *RepositoriesService) UpdateFile(ctx context.Context, owner, repo, path string, opt *RepositoryContentFileOptions) (*RepositoryContentResponse, *Response, error) {
+	u := fmt.Sprintf("repos/%s/%s/contents/%s", owner, repo, path)
+	req, err := s.client.NewRequest("PUT", u, opt)
+	if err != nil {
+		return nil, nil, err
+	}
+	updateResponse := new(RepositoryContentResponse)
+	resp, err := s.client.Do(ctx, req, updateResponse)
+	if err != nil {
+		return nil, resp, err
+	}
+	return updateResponse, resp, nil
+}
+
+// DeleteFile deletes a file from a repository and returns the commit.
+// Requires the blob SHA of the file to be deleted.
+//
+// GitHub API docs: https://developer.github.com/v3/repos/contents/#delete-a-file
+func (s *RepositoriesService) DeleteFile(ctx context.Context, owner, repo, path string, opt *RepositoryContentFileOptions) (*RepositoryContentResponse, *Response, error) {
+	u := fmt.Sprintf("repos/%s/%s/contents/%s", owner, repo, path)
+	req, err := s.client.NewRequest("DELETE", u, opt)
+	if err != nil {
+		return nil, nil, err
+	}
+	deleteResponse := new(RepositoryContentResponse)
+	resp, err := s.client.Do(ctx, req, deleteResponse)
+	if err != nil {
+		return nil, resp, err
+	}
+	return deleteResponse, resp, nil
+}
+
+// archiveFormat is used to define the archive type when calling GetArchiveLink.
+type archiveFormat string
+
+const (
+	// Tarball specifies an archive in gzipped tar format.
+	Tarball archiveFormat = "tarball"
+
+	// Zipball specifies an archive in zip format.
+	Zipball archiveFormat = "zipball"
+)
+
+// GetArchiveLink returns an URL to download a tarball or zipball archive for a
+// repository. The archiveFormat can be specified by either the github.Tarball
+// or github.Zipball constant.
+//
+// GitHub API docs: https://developer.github.com/v3/repos/contents/#get-archive-link
+func (s *RepositoriesService) GetArchiveLink(ctx context.Context, owner, repo string, archiveformat archiveFormat, opt *RepositoryContentGetOptions) (*url.URL, *Response, error) {
+	u := fmt.Sprintf("repos/%s/%s/%s", owner, repo, archiveformat)
+	if opt != nil && opt.Ref != "" {
+		u += fmt.Sprintf("/%s", opt.Ref)
+	}
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	var resp *http.Response
+	// Use http.DefaultTransport if no custom Transport is configured
+	req = withContext(ctx, req)
+	if s.client.client.Transport == nil {
+		resp, err = http.DefaultTransport.RoundTrip(req)
+	} else {
+		resp, err = s.client.client.Transport.RoundTrip(req)
+	}
+	if err != nil {
+		return nil, nil, err
+	}
+	resp.Body.Close()
+	if resp.StatusCode != http.StatusFound {
+		return nil, newResponse(resp), fmt.Errorf("unexpected status code: %s", resp.Status)
+	}
+	parsedURL, err := url.Parse(resp.Header.Get("Location"))
+	return parsedURL, newResponse(resp), err
+}