Correctly parse Misskey object emoji format

[dastardlylemon]

I noticed that while Megalodon assumes that Misskey emojis come down in an array, in my testing, they have the same format as the reactionEmojis: that is to say, an object of key (shortcode) value (url) pairs. This change uses the same logic as for mapping emoji reactions to generate the emojis list.

I don't know if older versions of Misskey presented the emojis field as an array, so I've kept in the old logic for backwards compatibility. Both instances I tested on (misskey.io and misskey.design) exhibited the new behavior.

curl -d '{"i": $MISSKEY_ACCESS_KEY }' -H "Content-Type: application/json" -X POST https://misskey.design/api/notes/timeline

[
    {
        "id": "9hcg3rd24h",
        "createdAt": "2023-07-18T22:43:39.974Z",
        "userId": "9ccl3jbs6i",
        "user": {
            "id": "9ccl3jbs6i",
            "name": "望月ハル:skeb::verified_blue:",
            "username": "haltaro3",
            "host": "misskey.io",
            "avatarUrl": "https://misskey.design/proxy/avatar.webp?url=https%3A%2F%2Ffile.misskey.design%2Fpost%2F393a162a-61bb-46ed-b889-15d026be0e83.png&avatar=1",
            "avatarBlurhash": "ePQJAuRiI:D%.7~qs:smxuRQo}bIt7xuMx?Ht7WBspSzD*ayt6axxa",
            "isBot": false,
            "isCat": false,
            "instance": {
                "name": "Misskey.io",
                "softwareName": "misskey",
                "softwareVersion": "13.13.2",
                "iconUrl": "https://misskey.io/static-assets/icons/192.png",
                "faviconUrl": "https://s3.arkjp.net/misskey/webpublic-0c66b1ca-b8c0-4eaa-9827-47674f4a1580.png",
                "themeColor": "#86b300"
            },
            "emojis": {
                "skeb": "https://s3.arkjp.net/misskey/03e01164-c5f3-42e4-9c70-1619fef7f076.png",
                "verified_blue": "https://s3.arkjp.net/emoji/verified_blue.png"
            },
            "onlineStatus": "unknown"
        },
        "text": "ダンボールの山減らす作業しなきゃ:blobcozynap:",
        "cw": null,
        "visibility": "public",
        "localOnly": false,
        "reactionAcceptance": null,
        "renoteCount": 0,
        "repliesCount": 0,
        "reactions": {
            ":blobhai@misskey.io:": 1,
            ":super_igyo@misskey.io:": 9
        },
        "reactionEmojis": {
            "blobhai@misskey.io": "https://s3.arkjp.net/emoji/blobhai.gif",
            "super_igyo@misskey.io": "https://s3.arkjp.net/misskey/4ad1e9a6-9744-4a92-89bf-fac1ad3e7a65.png"
        },
        "emojis": {
            "blobcozynap": "https://s3.arkjp.net/emoji/blobcozynap.png"
        },
        "fileIds": [],
        "files": [],
        "replyId": null,
        "renoteId": null,
        "uri": "https://misskey.io/notes/9hcg3rd2uu"
    },
...
]

The emojis field is not mentioned at all in the API docs, so I don't have a source of truth other than my test requests.

[h3poteto]

I'm wondering when emojis field is filled. In my timeline, the field is always empty.

[
  {
    "id": "9hgx7auyzu",
    "createdAt": "2023-07-22T01:53:23.386Z",
    "userId": "7rl99pkppb",
    "user": {
      "id": "7rl99pkppb",
      "name": "h3poteto",
      "username": "h3poteto",
      "host": "pleroma.io",
      "avatarUrl": "https://proxy.misskeyusercontent.com/avatar.webp?url=https%3A%2F%2Fpleroma.io%2Fmedia%2F0dc2c5ad4b8416469a14570d7f2ccbf74c87b26a46ecd3728b0731bee763be9a.blob&avatar=1",
      "avatarBlurhash": "yNKC000[0F;]r==qXUEUr;r;kXofjYWBI^rqxBT0WAW?n$0;$xxuwZocOGRkIrxYjES$bbV@ofXUaengW?oIayoL9xxY$}NHR*bdsl",
      "isBot": false,
      "isCat": false,
      "instance": {
        "name": "Pleroma.io",
        "softwareName": "pleroma",
        "softwareVersion": "2.5.1-0-gdea5476",
        "iconUrl": "https://pleroma.io/static/logo.svg",
        "faviconUrl": "https://pleroma.io/favicon.png",
        "themeColor": "#282c37"
      },
      "emojis": {},
      "onlineStatus": "unknown"
    },
    "text": "ゆれてる？",
    "cw": null,
    "visibility": "public",
    "localOnly": false,
    "reactionAcceptance": null,
    "renoteCount": 0,
    "repliesCount": 0,
    "reactions": {},
    "reactionEmojis": {},
    "emojis": {},
    "fileIds": [],
    "files": [],
    "replyId": null,
    "renoteId": null,
    "uri": "https://pleroma.io/objects/c258b946-f5d1-451c-b41c-d221438461a2"
  },
  {
    "id": "9hgu9n3a02",
    "createdAt": "2023-07-22T00:31:13.702Z",
    "userId": "7rl99pkppb",
    "user": {
      "id": "7rl99pkppb",
      "name": "h3poteto",
      "username": "h3poteto",
      "host": "pleroma.io",
      "avatarUrl": "https://proxy.misskeyusercontent.com/avatar.webp?url=https%3A%2F%2Fpleroma.io%2Fmedia%2F0dc2c5ad4b8416469a14570d7f2ccbf74c87b26a46ecd3728b0731bee763be9a.blob&avatar=1",
      "avatarBlurhash": "yNKC000[0F;]r==qXUEUr;r;kXofjYWBI^rqxBT0WAW?n$0;$xxuwZocOGRkIrxYjES$bbV@ofXUaengW?oIayoL9xxY$}NHR*bdsl",
      "isBot": false,
      "isCat": false,
      "instance": {
        "name": "Pleroma.io",
        "softwareName": "pleroma",
        "softwareVersion": "2.5.1-0-gdea5476",
        "iconUrl": "https://pleroma.io/static/logo.svg",
        "faviconUrl": "https://pleroma.io/favicon.png",
        "themeColor": "#282c37"
      },
      "emojis": {},
      "onlineStatus": "unknown"
    },
    "text": "熱は下がってきたけど，喉がひどい",
    "cw": null,
    "visibility": "public",
    "localOnly": false,
    "reactionAcceptance": null,
    "renoteCount": 0,
    "repliesCount": 0,
    "reactions": {
      ":meowbongopat@misskey.social:": 1
    },
    "reactionEmojis": {
      "meowbongopat@misskey.social": "https://misskey.social/files/f723dfeb-ee52-4057-8096-99d4a49a12a6"
    },
    "emojis": {},
    "fileIds": [],
    "files": [],
    "replyId": null,
    "renoteId": null,
    "uri": "https://pleroma.io/objects/213f647b-4218-413d-adfc-83ce323d1caf"
  },

[dastardlylemon]

I don't know if Pleroma uses this field, but Misskey populates it whenever the user has custom emojis in their username or bio, or if the note itself has custom emojis. (reactions are separate and used only for the reaction emojis, not related to the note itself)