[fanbox] add 'metadata' option (#4921)

extracts 'plan' and extended 'user' metadata

test/results/fanbox.py

@@ -86,6 +86,43 @@ __tests__ = (
     "content": r"re:(?s)^Greetings from FANBOX.\n \nAs of Monday, September 5th, 2022, we are happy to announce the start of the FANBOX hashtag event #MySetupTour ! \nAbout the event\nTo join this event .+ \nPlease check this page for further details regarding the Privacy & Terms.\nhttps://fanbox.pixiv.help/.+/10184952456601\n\n\nThank you for your continued support of FANBOX.$",
 },
 
+{
+    "#url"     : "https://official-en.fanbox.cc/posts/7022572",
+    "#comment" : "'plan' and 'user' metadata (#4921)",
+    "#category": ("", "fanbox", "post"),
+    "#class"   : fanbox.FanboxPostExtractor,
+    "#options" : {"metadata": True},
+
+    "plan": {
+        "coverImageUrl"  : "",
+        "creatorId"      : "official-en",
+        "description"    : "",
+        "fee"            : 0,
+        "hasAdultContent": None,
+        "id"             : "",
+        "paymentMethod"  : None,
+        "title"          : "",
+    },
+    "user": {
+        "coverImageUrl"     : "https://pixiv.pximg.net/c/1620x580_90_a2_g5/fanbox/public/images/creator/74349833/cover/n9mX8q4tUXHXXj7sK1RPWyUu.jpeg",
+        "creatorId"         : "official-en",
+        "description"       : "This is the official English pixivFANBOX account! \n(official Japanese account: https://official.fanbox.cc/ )\n\npixivFANBOX is a subscription service for building a reliable fan community where creators can nurture creative lifestyles together with their fans.\nFollowers can be notified of the updates from their favorite creators they are following. Supporters can enjoy closer communication with creators through exclusive content and their latest information.\n",
+        "hasAdultContent"   : False,
+        "hasBoothShop"      : False,
+        "iconUrl"           : "https://pixiv.pximg.net/c/160x160_90_a2_g5/fanbox/public/images/user/74349833/icon/oJH0OoGoSixLrJXlnneNvC95.jpeg",
+        "isAcceptingRequest": False,
+        "isFollowed"        : False,
+        "isStopped"         : False,
+        "isSupported"       : False,
+        "name"              : "pixivFANBOX English",
+        "profileItems"      : [],
+        "profileLinks"      : [
+            "https://twitter.com/pixivfanbox",
+        ],
+        "userId"            : "74349833",
+    },
+},
+
 {
     "#url"     : "https://mochirong.fanbox.cc/posts/3746116",
     "#comment" : "imageMap file order (#2718)",