feat(github): add github support

Signed-off-by: kjuulh <contact@kjuulh.io>

internal/providers/github.go

@@ -0,0 +1,117 @@
+package providers
+
+import (
+	"context"
+	"fmt"
+	"html"
+	"log"
+	"net/http"
+	"strings"
+
+	"git.front.kjuulh.io/kjuulh/contractor/internal/models"
+
+	"github.com/bradleyfalzon/ghinstallation/v2"
+	"github.com/google/go-github/v53/github"
+)
+
+type GitHubClient struct {
+	appID          *int64
+	installationID *int64
+	privateKeyPath *string
+
+	client *github.Client
+}
+
+func NewGitHubClient(appID, installationID *int64, privateKeyPath *string) *GitHubClient {
+	return &GitHubClient{
+		appID:          appID,
+		installationID: installationID,
+		privateKeyPath: privateKeyPath,
+	}
+}
+
+func (gc *GitHubClient) makeSureClientExist() {
+	if gc.client != nil {
+		return
+	}
+
+	tr := http.DefaultTransport
+	itr, err := ghinstallation.NewKeyFromFile(tr, *gc.appID, *gc.installationID, *gc.privateKeyPath)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	client := github.NewClient(&http.Client{Transport: itr})
+
+	gc.client = client
+}
+
+func (gc *GitHubClient) EditComment(
+	ctx context.Context,
+	doneRequest *models.RefreshGitHubRepositoryDoneRequest,
+) error {
+	gc.makeSureClientExist()
+
+	commentBody := html.UnescapeString(doneRequest.CommentBody)
+	startCmnt := "<!-- Status update start -->"
+	startIdx := strings.Index(commentBody, startCmnt)
+	endIdx := strings.Index(commentBody, "<!-- Status update end -->")
+	if startIdx >= 0 && endIdx >= 0 {
+		log.Println("found comment to replace")
+
+		var content string
+
+		if doneRequest.Error != "" {
+			content = fmt.Sprintf("<pre>ERROR: %s</pre><br>", doneRequest.Error)
+		}
+		if doneRequest.Status != "" {
+			content = fmt.Sprintf("%s<p>%s</p>", content, doneRequest.Status)
+		}
+
+		doneRequest.CommentBody = fmt.Sprintf(
+			"%s<br><hr>%s<hr><br>%s",
+			commentBody[:startIdx+len(startCmnt)],
+			content,
+			commentBody[endIdx:],
+		)
+	}
+
+	_, _, err := gc.client.Issues.EditComment(ctx, doneRequest.Owner, doneRequest.Repository, int64(doneRequest.CommentID), &github.IssueComment{
+		Body: &doneRequest.CommentBody,
+	})
+	if err != nil {
+		log.Printf("failed to update comment: %s", err.Error())
+		return err
+	}
+
+	return nil
+}
+
+func (gc *GitHubClient) CreateWebhook(owner, repository string) error {
+	gc.makeSureClientExist()
+
+	// TODO: support for personal access tokens
+	// We implicitly get support via. github apps
+
+	return nil
+}
+
+func (gc *GitHubClient) AddComment(
+	owner, repository string,
+	pullRequest int,
+	comment string,
+) (*models.AddCommentResponse, error) {
+	gc.makeSureClientExist()
+
+	resp, _, err := gc.client.Issues.CreateComment(context.Background(), owner, repository, pullRequest, &github.IssueComment{
+		Body: &comment,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &models.AddCommentResponse{
+		Body: *resp.Body,
+		ID:   int(*resp.ID),
+	}, nil
+}