fix up git

server/internal/handlers/handlers_github_oauth.go

@@ -64,7 +64,7 @@ func GitHubAuthorizeURLHandler(db *gorm.DB) fiber.Handler {
 			"https://github.com/login/oauth/authorize?client_id=%s&redirect_uri=%s&scope=%s&state=%s",
 			url.QueryEscape(clientID),
 			url.QueryEscape(redirectURI),
-			url.QueryEscape("repo"),
+			url.QueryEscape("repo delete_repo"),
 			url.QueryEscape(state),
 		)
 		return c.JSON(fiber.Map{"authorizeUrl": authorizeURL})
@@ -192,10 +192,11 @@ func GitHubStatusHandler(db *gorm.DB) fiber.Handler {
 			return c.JSON(fiber.Map{"connected": false})
 		}
 		return c.JSON(fiber.Map{
-			"connected":   true,
-			"githubLogin": row.GitHubLogin,
-			"connectedAt": row.ConnectedAt,
-			"scope":       row.Scope,
+			"connected":      true,
+			"githubLogin":    row.GitHubLogin,
+			"connectedAt":    row.ConnectedAt,
+			"scope":          row.Scope,
+			"canDeleteRepos": githubScopeAllowsDelete(row.Scope),
 		})
 	}
 }
@@ -209,6 +210,21 @@ func GitHubDisconnectHandler(db *gorm.DB) fiber.Handler {
 	}
 }
 
+func githubScopeAllowsDelete(scope string) bool {
+	scope = strings.ToLower(strings.TrimSpace(scope))
+	if scope == "" {
+		return false
+	}
+	for _, part := range strings.FieldsFunc(scope, func(r rune) bool {
+		return r == ' ' || r == ','
+	}) {
+		if part == "delete_repo" {
+			return true
+		}
+	}
+	return false
+}
+
 func githubGetUser(token string) (login string, err error) {
 	req, _ := http.NewRequest(http.MethodGet, "https://api.github.com/user", nil)
 	req.Header.Set("Authorization", "Bearer "+token)
@@ -399,3 +415,61 @@ func resolvePublishRepo(token, ghLogin string, room *models.ExamRoom) (owner, re
 	}
 	return owner, repo, branch, htmlURL, nil
 }
+
+func studentGitRepoNameCandidates(row submissionRow, room *models.ExamRoom) []string {
+	base := trimGitHubRepoName(strings.ToLower(studentSubmissionFolder(row.StudentCode, row.FullName)))
+	candidates := []string{
+		base,
+		fmt.Sprintf("%s-exam-%d", base, room.ID),
+		fmt.Sprintf("%s-%d", base, row.StudentRkID),
+		fmt.Sprintf("exam-%d-%d", room.ID, row.StudentRkID),
+	}
+	seen := map[string]bool{}
+	out := make([]string, 0, len(candidates))
+	for _, c := range candidates {
+		c = trimGitHubRepoName(c)
+		if seen[c] {
+			continue
+		}
+		seen[c] = true
+		out = append(out, c)
+	}
+	for i := 2; i <= 10; i++ {
+		c := trimGitHubRepoName(fmt.Sprintf("%s-%d", base, i))
+		if !seen[c] {
+			seen[c] = true
+			out = append(out, c)
+		}
+	}
+	return out
+}
+
+func githubEnsureRepoForStudent(token, owner string, room *models.ExamRoom, row *submissionRow) (repoName, htmlURL string, err error) {
+	if u := strings.TrimSpace(row.GitRepoURL); u != "" {
+		o, r, parseErr := parseGitHubRepo(u)
+		if parseErr == nil && strings.EqualFold(o, owner) {
+			if url, ok := githubGetRepo(token, owner, r); ok {
+				return r, url, nil
+			}
+		}
+	}
+	for _, candidate := range studentGitRepoNameCandidates(*row, room) {
+		if url, ok := githubGetRepo(token, owner, candidate); ok {
+			if u := strings.TrimSpace(row.GitRepoURL); u != "" {
+				if o, r, parseErr := parseGitHubRepo(u); parseErr == nil && strings.EqualFold(o, owner) && strings.EqualFold(r, candidate) {
+					return candidate, url, nil
+				}
+			}
+			continue
+		}
+		url, createErr := githubCreateRepo(token, owner, candidate, true)
+		if createErr == nil {
+			return candidate, url, nil
+		}
+		if isGitHubRepoNameTaken(createErr) {
+			continue
+		}
+		return "", "", createErr
+	}
+	return "", "", errors.New("không tạo được repo GitHub cho sinh viên")
+}