From a157fc1cc3035f90f6d70b132009ab7360600232 Mon Sep 17 00:00:00 2001
From: Vladimir Zagainov <mrixs@mrixs.ru>
Date: Wed, 18 Jun 2025 13:16:57 +0300
Subject: [PATCH] feat(launcher): implement modpack manifest API endpoint

---
 cmd/server/main.go                      |  4 +++
 internal/api/launcher_handler.go        | 37 +++++++++++++++++++++++++
 internal/database/modpack_repository.go | 36 +++++++++++++++++++++++-
 internal/models/launcher.go             |  8 ++++++
 4 files changed, 84 insertions(+), 1 deletion(-)
 create mode 100644 internal/api/launcher_handler.go
 create mode 100644 internal/models/launcher.go

diff --git a/cmd/server/main.go b/cmd/server/main.go
index 3eb8f4f..a0c0804 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -26,6 +26,7 @@ func main() {
 	serverPoller := &core.ServerPoller{Repo: serverRepo}
 
 	modpackHandler := &api.ModpackHandler{ModpackRepo: modpackRepo}
+	launcherHandler := &api.LauncherHandler{ModpackRepo: modpackRepo}
 
 	// Запускаем поллер в фоновой горутине
 	go serverPoller.Start(context.Background())
@@ -69,6 +70,9 @@ func main() {
 		r.Post("/join", authHandler.Join)
 		r.Get("/profile/{uuid}", profileHandler.GetProfile)
 	})
+	r.Route("/launcher", func(r chi.Router) {
+		r.Get("/modpacks/{name}/manifest", launcherHandler.GetModpackManifest)
+	})
 
 	// --- Защищенные роуты ---
 	r.Group(func(r chi.Router) {
diff --git a/internal/api/launcher_handler.go b/internal/api/launcher_handler.go
new file mode 100644
index 0000000..ab9b73d
--- /dev/null
+++ b/internal/api/launcher_handler.go
@@ -0,0 +1,37 @@
+package api
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"gitea.mrixs.me/minecraft-platform/backend/internal/database"
+	"github.com/go-chi/chi/v5"
+	"github.com/jackc/pgx/v5"
+)
+
+type LauncherHandler struct {
+	ModpackRepo *database.ModpackRepository
+}
+
+func (h *LauncherHandler) GetModpackManifest(w http.ResponseWriter, r *http.Request) {
+	modpackName := chi.URLParam(r, "name")
+	if modpackName == "" {
+		http.Error(w, "Modpack name is required", http.StatusBadRequest)
+		return
+	}
+
+	manifest, err := h.ModpackRepo.GetModpackManifest(r.Context(), modpackName)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			http.Error(w, "Modpack not found or not active", http.StatusNotFound)
+			return
+		}
+		http.Error(w, "Failed to get modpack manifest", http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(manifest)
+}
diff --git a/internal/database/modpack_repository.go b/internal/database/modpack_repository.go
index d3790fb..8da2ce4 100644
--- a/internal/database/modpack_repository.go
+++ b/internal/database/modpack_repository.go
@@ -10,7 +10,7 @@ import (
 )
 
 type ModpackRepository struct {
-	DB *pgxpool.Pool // <--- ИЗМЕНЕНИЕ
+	DB *pgxpool.Pool
 }
 
 // CreateModpackTx создает модпак и все его файлы в одной транзакции.
@@ -47,3 +47,37 @@ func (r *ModpackRepository) CreateModpackTx(ctx context.Context, modpack *models
 
 	return tx.Commit(ctx)
 }
+
+// GetModpackManifest возвращает список файлов для указанного модпака.
+func (r *ModpackRepository) GetModpackManifest(ctx context.Context, modpackName string) ([]models.ManifestEntry, error) {
+	query := `
+		SELECT mf.relative_path, mf.file_hash, mf.file_size
+		FROM modpack_files mf
+		JOIN modpacks m ON mf.modpack_id = m.id
+		WHERE m.name = $1 AND m.is_active = TRUE`
+
+	rows, err := r.DB.Query(ctx, query, modpackName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var manifest []models.ManifestEntry
+	for rows.Next() {
+		var entry models.ManifestEntry
+		if err := rows.Scan(&entry.Path, &entry.Hash, &entry.Size); err != nil {
+			return nil, err
+		}
+		manifest = append(manifest, entry)
+	}
+
+	if len(manifest) == 0 {
+		var exists bool
+		err := r.DB.QueryRow(ctx, "SELECT EXISTS(SELECT 1 FROM modpacks WHERE name = $1)", modpackName).Scan(&exists)
+		if err != nil || !exists {
+			return nil, pgx.ErrNoRows
+		}
+	}
+
+	return manifest, nil
+}
diff --git a/internal/models/launcher.go b/internal/models/launcher.go
new file mode 100644
index 0000000..93824ae
--- /dev/null
+++ b/internal/models/launcher.go
@@ -0,0 +1,8 @@
+package models
+
+// ManifestEntry представляет один файл в манифесте модпака.
+type ManifestEntry struct {
+	Path string `json:"path"`
+	Hash string `json:"hash"`
+	Size int64  `json:"size"`
+}