123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
package client
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import (
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"context"
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"errors"
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"math/rand"
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"path/filepath"
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"time"
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"git.kapelle.org/niklas/s3share/internal/db"
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"git.kapelle.org/niklas/s3share/internal/s3"
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"git.kapelle.org/niklas/s3share/internal/types"
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)
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var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
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type Client struct {
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db db.DB
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s3 s3.S3
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}
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func NewClient(db db.DB, s3 s3.S3) *Client {
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rand.Seed(time.Now().UnixNano())
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return &Client{
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db: db,
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s3: s3,
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}
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}
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// createRandomString creates a random string of length 6 to be used as a slug
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func createRandomString() string {
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s := make([]rune, 6)
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for i := range s {
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s[i] = letters[rand.Intn(len(letters))]
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}
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return string(s)
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}
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// createValidSlug creates a valid slug that is not yet in use
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func (c *Client) createValidSlug(ctx context.Context) (string, error) {
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for i := 0; i < 10; i++ {
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slug := createRandomString()
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res, err := c.db.GetShare(ctx, slug)
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if err != nil {
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return "", err
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}
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if res == nil {
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return slug, nil
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}
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}
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return "", errors.New("could not create valid slug after 10 tries")
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}
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// GetShare returns the share with the given slug, nil if not found
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func (c *Client) GetShare(ctx context.Context, slug string) (*types.Share, error) {
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return c.db.GetShare(ctx, slug)
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}
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// CreateShare creates a new share with the given key and returns the share with the slug
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func (c *Client) CreateShare(ctx context.Context, key string) (*types.Share, error) {
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slug, err := c.createValidSlug(ctx)
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if err != nil {
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return nil, err
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}
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share := &types.Share{
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Slug: slug,
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Key: key,
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}
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exists, err := c.s3.KeyExists(ctx, key)
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if err != nil {
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return nil, err
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}
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if !exists {
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return nil, types.ErrKeyNotFound
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}
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err = c.db.CreateShare(ctx, share)
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if err != nil {
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return nil, err
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}
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return share, nil
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}
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// GetObjectFromShare returns the s3 object to the given share
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func (c *Client) GetObjectFromShare(ctx context.Context, share *types.Share) (s3.ObjectReader, error) {
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return c.s3.GetObject(ctx, share.Key)
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}
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// DeleteShare deletes the share with the given slug
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func (c *Client) DeleteShare(ctx context.Context, slug string) error {
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return c.db.DeleteShare(ctx, slug)
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}
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// GetObjectMetadata returns the metadata of the object with the given key
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func (c *Client) GetObjectMetadata(ctx context.Context, key string) (*types.Metadata, error) {
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metadata, err := c.s3.GetObjectMetadata(ctx, key)
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if err != nil {
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return nil, err
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}
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if metadata == nil {
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return nil, nil
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}
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if metadata.Filename == "" {
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metadata.Filename = filepath.Base(key)
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}
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return metadata, nil
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}
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// GetAllShares returns all shares
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func (c *Client) GetAllShares(ctx context.Context) ([]*types.Share, error) {
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return c.db.GetAllShares(ctx)
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}
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