Add collection api.

server/service/collection.go

@@ -0,0 +1,145 @@
+package service
+
+import (
+	"errors"
+	"nysoure/server/dao"
+	"nysoure/server/model"
+)
+
+// Create a new collection.
+func CreateCollection(uid uint, title, article string, host string) (*model.CollectionView, error) {
+	if uid == 0 || title == "" || article == "" {
+		return nil, errors.New("invalid parameters")
+	}
+	c, err := dao.CreateCollection(uid, title, article, findImagesInContent(article, host))
+	if err != nil {
+		return nil, err
+	}
+	view := c.ToView()
+	return view, nil
+}
+
+// Update an existing collection with user validation.
+func UpdateCollection(uid, id uint, title, article string, host string) error {
+	if uid == 0 || id == 0 || title == "" || article == "" {
+		return errors.New("invalid parameters")
+	}
+	collection, err := dao.GetCollectionByID(id)
+	if err != nil {
+		return err
+	}
+	if collection.UserID != uid {
+		return errors.New("user does not have permission to update this collection")
+	}
+	return dao.UpdateCollection(id, title, article, findImagesInContent(article, host))
+}
+
+// Delete a collection by ID.
+func DeleteCollection(uint, id uint) error {
+	user, err := dao.GetUserByID(id)
+	if err != nil {
+		return err
+	}
+
+	collection, err := dao.GetCollectionByID(id)
+	if err != nil {
+		return err
+	}
+
+	if user.ID != collection.UserID && !user.IsAdmin {
+		return errors.New("user does not have permission to delete this collection")
+	}
+
+	return dao.DeleteCollection(id)
+}
+
+// Add a resource to a collection with user validation.
+func AddResourceToCollection(uid, collectionID, resourceID uint) error {
+	if uid == 0 || collectionID == 0 || resourceID == 0 {
+		return errors.New("invalid parameters")
+	}
+	collection, err := dao.GetCollectionByID(collectionID)
+	if err != nil {
+		return err
+	}
+	if collection.UserID != uid {
+		return errors.New("user does not have permission to modify this collection")
+	}
+	return dao.AddResourceToCollection(collectionID, resourceID)
+}
+
+// Remove a resource from a collection with user validation.
+func RemoveResourceFromCollection(uid, collectionID, resourceID uint) error {
+	if uid == 0 || collectionID == 0 || resourceID == 0 {
+		return errors.New("invalid parameters")
+	}
+	collection, err := dao.GetCollectionByID(collectionID)
+	if err != nil {
+		return err
+	}
+	if collection.UserID != uid {
+		return errors.New("user does not have permission to modify this collection")
+	}
+	return dao.RemoveResourceFromCollection(collectionID, resourceID)
+}
+
+// Get a collection by ID.
+func GetCollectionByID(id uint) (*model.CollectionView, error) {
+	if id == 0 {
+		return nil, errors.New("invalid collection id")
+	}
+	c, err := dao.GetCollectionByID(id)
+	if err != nil {
+		return nil, err
+	}
+	return c.ToView(), nil
+}
+
+// List collections of a user with pagination.
+func ListUserCollections(uid uint, page int) ([]*model.CollectionView, int64, error) {
+	if uid == 0 || page < 1 {
+		return nil, 0, errors.New("invalid parameters")
+	}
+	collections, total, err := dao.ListUserCollections(uid, page, pageSize)
+	if err != nil {
+		return nil, 0, err
+	}
+	var views []*model.CollectionView
+	for _, c := range collections {
+		views = append(views, c.ToView())
+	}
+	return views, total, nil
+}
+
+// List resources in a collection with pagination.
+func ListCollectionResources(collectionID uint, page int) ([]*model.ResourceView, int64, error) {
+	if collectionID == 0 || page < 1 {
+		return nil, 0, errors.New("invalid parameters")
+	}
+	resources, total, err := dao.ListCollectionResources(collectionID, page, pageSize)
+	if err != nil {
+		return nil, 0, err
+	}
+	var views []*model.ResourceView
+	for _, r := range resources {
+		v := r.ToView()
+		views = append(views, &v)
+	}
+	return views, total, nil
+}
+
+// Search user collections by keyword, limited to 10 results.
+func SearchUserCollections(uid uint, keyword string) ([]*model.CollectionView, error) {
+	if uid == 0 || keyword == "" {
+		return nil, errors.New("invalid parameters")
+	}
+	collections, err := dao.SearchUserCollections(uid, keyword)
+	if err != nil {
+		return nil, err
+	}
+	var views []*model.CollectionView
+	for _, c := range collections {
+		views = append(views, c.ToView())
+	}
+	return views, nil
+}