initial code (#6)

* initial code commit

media/omdb/media.go

@@ -0,0 +1,72 @@
+package omdb
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"github.com/l3uddz/nabarr/util"
+	"github.com/lucperkins/rek"
+	"net/url"
+	"strings"
+)
+
+var (
+	ErrItemNotFound = errors.New("not found")
+)
+
+func (c *Client) GetItem(imdbId string) (*Item, error) {
+	// empty item when appropriate
+	if c.apiKey == "" || imdbId == "" {
+		return nil, nil
+	}
+
+	// prepare request
+	reqUrl, err := util.URLWithQuery(c.apiURL, url.Values{
+		"apikey": []string{c.apiKey},
+		"i":      []string{imdbId}})
+	if err != nil {
+		return nil, fmt.Errorf("generate lookup request url: %w", err)
+	}
+
+	c.log.Trace().
+		Str("url", reqUrl).
+		Msg("Searching omdb")
+
+	// send request
+	c.rl.Take()
+	resp, err := rek.Get(reqUrl, rek.Timeout(c.apiTimeout))
+	if err != nil {
+		return nil, fmt.Errorf("request lookup: %w", err)
+	}
+	defer resp.Body().Close()
+
+	// validate response
+	if resp.StatusCode() != 200 {
+		return nil, fmt.Errorf("validate lookup response: %s", resp.Status())
+	}
+
+	// decode response
+	b := new(lookupResponse)
+	if err := json.NewDecoder(resp.Body()).Decode(b); err != nil {
+		return nil, fmt.Errorf("decode lookup response: %w", err)
+	}
+
+	if b.Title == "" {
+		return nil, fmt.Errorf("item with imdbId: %v: %w", imdbId, ErrItemNotFound)
+	}
+
+	// transform response
+	rt := 0
+	for _, rating := range b.Ratings {
+		if strings.EqualFold(rating.Source, "Rotten Tomatoes") {
+			rt = util.Atoi(strings.TrimSuffix(rating.Value, "%"), 0)
+			break
+		}
+	}
+
+	return &Item{
+		Metascore:      util.Atoi(b.Metascore, 0),
+		RottenTomatoes: rt,
+		ImdbRating:     util.Atof64(b.ImdbRating, 0.0),
+	}, nil
+}