Add EmojiService

Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>

emoji.go

@@ -0,0 +1,84 @@
+package reddit
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+// EmojiService handles communication with the emoji
+// related methods of the Reddit API.
+//
+// Reddit API docs: https://www.reddit.com/dev/api/#section_collections
+type EmojiService struct {
+	client *Client
+}
+
+// Emoji is a graphic element you can include in a post flair or user flair.
+type Emoji struct {
+	Name             string `json:"name,omitempty"`
+	URL              string `json:"url,omitempty"`
+	UserFlairAllowed bool   `json:"user_flair_allowed,omitempty"`
+	PostFlairAllowed bool   `json:"post_flair_allowed,omitempty"`
+	ModFlairOnly     bool   `json:"mod_flair_only,omitempty"`
+	// ID of the user who created this emoji.
+	CreatedBy string `json:"created_by,omitempty"`
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface.
+// func (e *Emoji) UnmarshalJSON(data []byte) (err error) {
+// 	fmt.Println("===", string(data))
+// 	return nil
+// }
+
+type emojis []*Emoji
+
+func (e *emojis) UnmarshalJSON(data []byte) (err error) {
+	emojiMap := make(map[string]json.RawMessage)
+	err = json.Unmarshal(data, &emojiMap)
+	if err != nil {
+		return
+	}
+
+	for emojiName, emojiValue := range emojiMap {
+		emoji := new(Emoji)
+		err = json.Unmarshal(emojiValue, emoji)
+		if err != nil {
+			return
+		}
+		emoji.Name = emojiName
+		*e = append(*e, emoji)
+	}
+
+	return
+}
+
+// Get returns the default set of Reddit emojis, and those of the subreddit, respectively.
+func (s *EmojiService) Get(ctx context.Context, subreddit string) ([]*Emoji, []*Emoji, *Response, error) {
+	path := fmt.Sprintf("api/v1/%s/emojis/all", subreddit)
+
+	req, err := s.client.NewRequest(http.MethodGet, path, nil)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	root := make(map[string]emojis)
+	resp, err := s.client.Do(ctx, req, &root)
+	if err != nil {
+		return nil, nil, resp, err
+	}
+
+	defaultEmojis := root["snoomojis"]
+	var subredditEmojis []*Emoji
+
+	for k := range root {
+		if strings.HasPrefix(k, kindSubreddit) {
+			subredditEmojis = root[k]
+			break
+		}
+	}
+
+	return defaultEmojis, subredditEmojis, resp, nil
+}