feat(tools): repo_search with allowlist post-filter

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/tools/repo_search.go

@@ -0,0 +1,92 @@
+package tools
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/registry"
+)
+
+type RepoSearch struct {
+	c *gitea.Client
+	a *allowlist.Allowlist
+}
+
+func NewRepoSearch(c *gitea.Client, a *allowlist.Allowlist) *RepoSearch {
+	return &RepoSearch{c: c, a: a}
+}
+
+func (t *RepoSearch) Descriptor() registry.ToolDescriptor {
+	return registry.ToolDescriptor{
+		Name:        "repo_search",
+		Description: "Search repos by query string. Filters results by owner allowlist.",
+		InputSchema: json.RawMessage(`{
+			"type":"object",
+			"properties":{
+				"q":{"type":"string"},
+				"owner":{"type":"string"},
+				"page":{"type":"integer","minimum":1},
+				"limit":{"type":"integer","minimum":1,"maximum":50}
+			},
+			"required":["q"]
+		}`),
+	}
+}
+
+type repoSearchArgs struct {
+	Q     string `json:"q"`
+	Owner string `json:"owner"`
+	Page  int    `json:"page"`
+	Limit int    `json:"limit"`
+}
+
+func (t *RepoSearch) Call(ctx context.Context, raw json.RawMessage) (json.RawMessage, error) {
+	var args repoSearchArgs
+	if err := parseArgs(raw, &args); err != nil {
+		return nil, err
+	}
+	if args.Q == "" {
+		return nil, fmt.Errorf("q is required: %w", gitea.ErrValidation)
+	}
+	if args.Owner != "" {
+		if err := t.a.Check(args.Owner); err != nil {
+			return nil, err
+		}
+	}
+	if args.Page < 1 {
+		args.Page = 1
+	}
+	if args.Limit < 1 || args.Limit > 50 {
+		args.Limit = 30
+	}
+
+	repos, err := t.c.SearchRepos(ctx, args.Q, args.Owner, args.Page, args.Limit)
+	if err != nil {
+		return nil, err
+	}
+
+	// Post-filter when owner not specified — only allowlisted owners survive.
+	if args.Owner == "" {
+		filtered := make([]gitea.Repo, 0, len(repos))
+		for _, r := range repos {
+			parts := strings.SplitN(r.FullName, "/", 2)
+			if len(parts) != 2 {
+				continue
+			}
+			if t.a.Check(parts[0]) == nil {
+				filtered = append(filtered, r)
+			}
+		}
+		repos = filtered
+	}
+
+	out := map[string]any{"repos": repos}
+	if len(repos) == args.Limit {
+		out["next_page"] = args.Page + 1
+	}
+	return textOK(out)
+}