[gelbooru_v02] support using 'api-key' & 'user-id' (#8077)

- detect API error messages
- add default 1.0s request delay to 'rule34'

docs/configuration.rst

@@ -445,6 +445,7 @@ Default
         ``zerochan``
     * ``"1.0"``
         ``furaffinity``
+        ``rule34``
     * ``"1.0-2.0"``
         ``flickr``,
         ``pexels``,
@@ -4650,8 +4651,25 @@ Description
     restrict it to only one possible format.
 
 
+extractor.rule34.api-key & .user-id
+-----------------------------------
+Type
+    ``string``
+Default
+    ``null``
+Description
+    Values from the `API Access Credentials` section
+    found near the bottom of your account's
+    `Options <https://rule34.xxx/index.php?page=account&s=options>`__
+    page.
+
+    Enable `Generate New Key?` and click `Save`
+    if the value after ``&api_key=`` is empty,
+    e.g. ``&api_key=&user_id=12345``
+
+
 extractor.rule34xyz.format
----------------------------
+--------------------------
 Type
     * ``string``
     * ``list`` of ``strings``

docs/gallery-dl.conf

@@ -633,6 +633,12 @@
         {
             "format": ["hd", "sd", "gif"]
         },
+        "rule34":
+        {
+            "api-key": null,
+            "user-id": null,
+            "sleep-request": "1.0"
+        },
         "rule34xyz":
         {
             "username": "",

gallery_dl/extractor/gelbooru_v02.py

@@ -16,17 +16,33 @@ import collections
 class GelbooruV02Extractor(booru.BooruExtractor):
     basecategory = "gelbooru_v02"
 
+    def __init__(self, match):
+        booru.BooruExtractor.__init__(self, match)
+        self.request_interval = self.config_instance("request-interval", 0.0)
+        self.root_api = self.config_instance("root-api") or self.root
+
     def _init(self):
         self.api_key = self.config("api-key")
         self.user_id = self.config("user-id")
-        self.root_api = self.config_instance("root-api") or self.root
 
         if self.category == "rule34":
             self._file_url = self._file_url_rule34
 
     def _api_request(self, params):
+        params["api_key"] = self.api_key
+        params["user_id"] = self.user_id
+
         url = self.root_api + "/index.php?page=dapi&s=post&q=index"
-        return self.request_xml(url, params=params)
+        root = self.request_xml(url, params=params)
+
+        if root.tag == "error":
+            msg = root.text
+            if msg.lower().startswith("missing authentication"):
+                raise exception.AuthRequired(
+                    "'api-key' & 'user-id'", "the API", msg)
+            raise exception.AbortExtraction(f"'{msg}'")
+
+        return root
 
     def _pagination(self, params):
         params["pid"] = self.page_start
@@ -148,6 +164,7 @@ BASE_PATTERN = GelbooruV02Extractor.update({
     "rule34": {
         "root": "https://rule34.xxx",
         "root-api": "https://api.rule34.xxx",
+        "request-interval": 1.0,
         "pattern": r"(?:www\.)?rule34\.xxx",
     },
     "safebooru": {