Packages (#67)

* Delete middleware package, move aws to new package
* Refactor github_client into github package
* Move terraform_client to its own package

github/github_client.go

@@ -0,0 +1,100 @@
+package github
+
+import (
+	"context"
+
+	"fmt"
+	"net/url"
+	"strings"
+
+	"github.com/google/go-github/github"
+	"github.com/hootsuite/atlantis/models"
+	"github.com/pkg/errors"
+)
+
+type Client struct {
+	client *github.Client
+	ctx    context.Context
+}
+
+func NewClient(hostname string, user string, pass string) (*Client, error) {
+	tp := github.BasicAuthTransport{
+		Username: strings.TrimSpace(user),
+		Password: strings.TrimSpace(pass),
+	}
+	client := github.NewClient(tp.Client())
+	// If we're using github.com then we don't need to do any additional configuration
+	// for the client. It we're using Github Enterprise, then we need to manually
+	// set the base url for the API
+	if hostname != "github.com" {
+		baseURL := fmt.Sprintf("https://%s/api/v3/", hostname)
+		base, err := url.Parse(baseURL)
+		if err != nil {
+			return nil, errors.Wrapf(err, "Invalid github hostname trying to parse %s", baseURL)
+		}
+		client.BaseURL = base
+	}
+
+	return &Client{
+		client: client,
+		ctx:    context.Background(),
+	}, nil
+}
+
+// GetModifiedFiles returns the names of files that were modified in the pull request.
+// The names include the path to the file from the repo root, ex. parent/child/file.txt
+func (c *Client) GetModifiedFiles(repo models.Repo, pull models.PullRequest) ([]string, error) {
+	var files []string
+	nextPage := 0
+	for {
+		opts := github.ListOptions{
+			PerPage: 300,
+		}
+		if nextPage != 0 {
+			opts.Page = nextPage
+		}
+		pageFiles, resp, err := c.client.PullRequests.ListFiles(c.ctx, repo.Owner, repo.Name, pull.Num, &opts)
+		if err != nil {
+			return files, err
+		}
+		for _, f := range pageFiles {
+			files = append(files, f.GetFilename())
+		}
+		if resp.NextPage == 0 {
+			break
+		}
+		nextPage = resp.NextPage
+	}
+	return files, nil
+}
+
+func (c *Client) CreateComment(repo models.Repo, pull models.PullRequest, comment string) error {
+	_, _, err := c.client.Issues.CreateComment(c.ctx, repo.Owner, repo.Name, pull.Num, &github.IssueComment{Body: &comment})
+	return err
+}
+
+func (c *Client) PullIsApproved(repo models.Repo, pull models.PullRequest) (bool, error) {
+	reviews, _, err := c.client.PullRequests.ListReviews(c.ctx, repo.Owner, repo.Name, pull.Num, nil)
+	if err != nil {
+		return false, errors.Wrap(err, "getting reviews")
+	}
+	for _, review := range reviews {
+		if review != nil && review.GetState() == "APPROVED" {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+func (c *Client) GetPullRequest(repo models.Repo, num int) (*github.PullRequest, *github.Response, error) {
+	return c.client.PullRequests.Get(c.ctx, repo.Owner, repo.Name, num)
+}
+
+func (c *Client) UpdateStatus(repo models.Repo, pull models.PullRequest, state string, description string, context string) error {
+	status := &github.RepoStatus{
+		State:       github.String(state),
+		Description: github.String(description),
+		Context:     github.String(context)}
+	_, _, err := c.client.Repositories.CreateStatus(c.ctx, repo.Owner, repo.Name, pull.HeadCommit, status)
+	return err
+}