Add 13 access-review driver implementations → Dispatch new providers in review engine and name worker

- Add 13 access-review driver implementations
- Add VCR-driven driver tests with synthetic cassettes
- Guard cassettes against non-synthetic email leaks
- Dispatch new providers in review engine and name worker

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/accessreview/drivers/gitlab.go

@@ -0,0 +1,160 @@
+// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package drivers
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strconv"
+
+	"go.probo.inc/probo/pkg/coredata"
+	"go.probo.inc/probo/pkg/rfc5988"
+)
+
+// GitLabDriver fetches all-members of a GitLab group via REST API
+// using a pre-authenticated HTTP client (Bearer token).
+//
+// Notes on data quality on gitlab.com SaaS:
+//   - `email` is often null on Free; we leave it blank when the API
+//     returns null. `username` is used as the FullName fallback.
+//   - Per-user MFA status is admin-only on gitlab.com SaaS, so MFAStatus
+//     is left Unknown.
+//   - `last_login_at` is paid-plan only via the separate /billable_members
+//     endpoint, so LastLogin is left nil for v1.
+type GitLabDriver struct {
+	httpClient *http.Client
+	groupID    string
+}
+
+var _ Driver = (*GitLabDriver)(nil)
+
+func NewGitLabDriver(httpClient *http.Client, groupID string) *GitLabDriver {
+	return &GitLabDriver{
+		httpClient: &http.Client{
+			Transport: &retryRoundTripper{
+				next:       httpClient.Transport,
+				maxRetries: 3,
+			},
+		},
+		groupID: groupID,
+	}
+}
+
+type gitlabMember struct {
+	ID          int64  `json:"id"`
+	Username    string `json:"username"`
+	Name        string `json:"name"`
+	Email       string `json:"email"`
+	State       string `json:"state"`
+	AccessLevel int    `json:"access_level"`
+}
+
+func (d *GitLabDriver) ListAccounts(ctx context.Context) ([]AccountRecord, error) {
+	var records []AccountRecord
+
+	next := fmt.Sprintf(
+		"https://gitlab.com/api/v4/groups/%s/members/all?per_page=100",
+		d.groupID,
+	)
+
+	for range maxPaginationPages {
+		members, linkHeader, err := d.queryMembers(ctx, next)
+		if err != nil {
+			return nil, err
+		}
+
+		for _, m := range members {
+			fullName := m.Name
+			if fullName == "" {
+				fullName = m.Username
+			}
+
+			active := m.State == "active"
+
+			role := gitlabAccessLevelLabel(m.AccessLevel)
+
+			record := AccountRecord{
+				Email:       m.Email,
+				FullName:    fullName,
+				Role:        role,
+				Active:      &active,
+				IsAdmin:     m.AccessLevel >= 50, // 50 = Owner
+				MFAStatus:   coredata.MFAStatusUnknown,
+				AuthMethod:  coredata.AccessEntryAuthMethodUnknown,
+				AccountType: coredata.AccessEntryAccountTypeUser,
+				ExternalID:  strconv.FormatInt(m.ID, 10),
+			}
+
+			records = append(records, record)
+		}
+
+		next = rfc5988.FindByRel(linkHeader, "next")
+		if next == "" {
+			return records, nil
+		}
+	}
+
+	return nil, fmt.Errorf("cannot list all gitlab accounts: %w", ErrPaginationLimitReached)
+}
+
+func (d *GitLabDriver) queryMembers(ctx context.Context, url string) ([]gitlabMember, string, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, "", fmt.Errorf("cannot create gitlab members request: %w", err)
+	}
+	req.Header.Set("Accept", "application/json")
+
+	httpResp, err := d.httpClient.Do(req)
+	if err != nil {
+		return nil, "", fmt.Errorf("cannot execute gitlab members request: %w", err)
+	}
+	defer func() { _ = httpResp.Body.Close() }()
+
+	if httpResp.StatusCode < 200 || httpResp.StatusCode >= 300 {
+		return nil, "", fmt.Errorf("cannot fetch gitlab members: unexpected status %d", httpResp.StatusCode)
+	}
+
+	var members []gitlabMember
+	if err := json.NewDecoder(httpResp.Body).Decode(&members); err != nil {
+		return nil, "", fmt.Errorf("cannot decode gitlab members response: %w", err)
+	}
+
+	return members, httpResp.Header.Get("Link"), nil
+}
+
+// gitlabAccessLevelLabel maps GitLab numeric access levels to human
+// labels. Source: https://docs.gitlab.com/api/members/#roles
+func gitlabAccessLevelLabel(level int) string {
+	switch level {
+	case 5:
+		return "Minimal Access"
+	case 10:
+		return "Guest"
+	case 15:
+		return "Planner"
+	case 20:
+		return "Reporter"
+	case 30:
+		return "Developer"
+	case 40:
+		return "Maintainer"
+	case 50:
+		return "Owner"
+	default:
+		return ""
+	}
+}