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| 1 | +// SPDX-License-Identifier: AGPL-3.0-or-later |
| 2 | + |
| 3 | +package repos |
| 4 | + |
| 5 | +import ( |
| 6 | + "context" |
| 7 | + "errors" |
| 8 | + "regexp" |
| 9 | + "strings" |
| 10 | + |
| 11 | + reposdb "github.com/tenseleyFlow/shithub/internal/repos/sqlc" |
| 12 | +) |
| 13 | + |
| 14 | +// MaxTopicsPerRepo and MaxTopicLength match the spec's day-1 lean |
| 15 | +// (20 topics, 50 chars each). The shape regex covers GitHub's topic |
| 16 | +// rules: lowercase letters/digits/hyphens, can't start/end with a |
| 17 | +// hyphen, 1–50 chars. |
| 18 | +const ( |
| 19 | + MaxTopicsPerRepo = 20 |
| 20 | + MaxTopicLength = 50 |
| 21 | +) |
| 22 | + |
| 23 | +// Errors surfaced by topic mutation. |
| 24 | +var ( |
| 25 | + ErrTooManyTopics = errors.New("repos: too many topics (max 20)") |
| 26 | + ErrInvalidTopic = errors.New("repos: topic must be lowercase letters, digits, and hyphens; 1-50 chars") |
| 27 | +) |
| 28 | + |
| 29 | +var topicRE = regexp.MustCompile(`^[a-z0-9](?:[a-z0-9-]{0,48}[a-z0-9])?$`) |
| 30 | + |
| 31 | +// NormalizeTopics dedups + lowercases an incoming list and validates |
| 32 | +// each entry. Returns the cleaned slice (stable-ordered, dedup'd) or |
| 33 | +// the first validation error. |
| 34 | +func NormalizeTopics(raw []string) ([]string, error) { |
| 35 | + seen := map[string]struct{}{} |
| 36 | + out := make([]string, 0, len(raw)) |
| 37 | + for _, t := range raw { |
| 38 | + t = strings.ToLower(strings.TrimSpace(t)) |
| 39 | + if t == "" { |
| 40 | + continue |
| 41 | + } |
| 42 | + if !topicRE.MatchString(t) { |
| 43 | + return nil, ErrInvalidTopic |
| 44 | + } |
| 45 | + if _, dup := seen[t]; dup { |
| 46 | + continue |
| 47 | + } |
| 48 | + seen[t] = struct{}{} |
| 49 | + out = append(out, t) |
| 50 | + } |
| 51 | + if len(out) > MaxTopicsPerRepo { |
| 52 | + return nil, ErrTooManyTopics |
| 53 | + } |
| 54 | + return out, nil |
| 55 | +} |
| 56 | + |
| 57 | +// ReplaceTopics atomically swaps the topic set for a repo. The |
| 58 | +// orchestrator owns tx ordering: DELETE + per-row INSERT in one tx |
| 59 | +// so a partial failure rolls back. The unique index on (repo_id, |
| 60 | +// topic) makes the inserts idempotent against a concurrent run. |
| 61 | +func ReplaceTopics(ctx context.Context, deps Deps, repoID int64, topics []string) error { |
| 62 | + clean, err := NormalizeTopics(topics) |
| 63 | + if err != nil { |
| 64 | + return err |
| 65 | + } |
| 66 | + tx, err := deps.Pool.Begin(ctx) |
| 67 | + if err != nil { |
| 68 | + return err |
| 69 | + } |
| 70 | + committed := false |
| 71 | + defer func() { |
| 72 | + if !committed { |
| 73 | + _ = tx.Rollback(ctx) |
| 74 | + } |
| 75 | + }() |
| 76 | + q := reposdb.New() |
| 77 | + if err := q.ReplaceRepoTopics(ctx, tx, repoID); err != nil { |
| 78 | + return err |
| 79 | + } |
| 80 | + for _, t := range clean { |
| 81 | + if err := q.InsertRepoTopic(ctx, tx, reposdb.InsertRepoTopicParams{ |
| 82 | + RepoID: repoID, Topic: t, |
| 83 | + }); err != nil { |
| 84 | + return err |
| 85 | + } |
| 86 | + } |
| 87 | + if err := tx.Commit(ctx); err != nil { |
| 88 | + return err |
| 89 | + } |
| 90 | + committed = true |
| 91 | + return nil |
| 92 | +} |
