[blogger] add search extractor (#925)

docs/supportedsites.rst

@@ -20,7 +20,7 @@ Archived.Moe         https://archived.moe/               Threads
 ArtStation           https://www.artstation.com/         |artstation-C|
 baraag               https://baraag.net/                 Images from Statuses, User Profiles                Optional (`OAuth <https://github.com/mikf/gallery-dl#oauth>`__)
 Behance              https://www.behance.net/            Collections, Galleries, User Profiles
-Blogger              https://www.blogger.com/            Blogs, Posts
+Blogger              https://www.blogger.com/            Blogs, Posts, Search Results
 Danbooru             https://danbooru.donmai.us/         Pools, Popular Images, Posts, Tag Searches         Optional
 Desuarchive          https://desuarchive.org/            Threads
 DeviantArt           https://www.deviantart.com/         |deviantart-C|                                     Optional (`OAuth <https://github.com/mikf/gallery-dl#oauth>`__)

gallery_dl/extractor/blogger.py

@@ -147,7 +147,7 @@ class BloggerPostExtractor(BloggerExtractor):
 class BloggerBlogExtractor(BloggerExtractor):
     """Extractor for an entire Blogger blog"""
     subcategory = "blog"
-    pattern = BASE_PATTERN + "(?:/search/label/([^/?&#]+))?/?$"
+    pattern = BASE_PATTERN + r"/?$"
     test = (
         ("https://julianbphotography.blogspot.com/", {
             "range": "1-25",
@@ -160,13 +160,36 @@ class BloggerBlogExtractor(BloggerExtractor):
         }),
     )
 
+    def posts(self, blog):
+        return self.api.blog_posts(blog["id"])
+
+
+class BloggerSearchExtractor(BloggerExtractor):
+    """Extractor for search resuls and labels"""
+    subcategory = "search"
+    pattern = BASE_PATTERN + r"/search(?:/?\?q=([^/?&#]+)|/label/([^/?&#]+))"
+    test = (
+        ("https://julianbphotography.blogspot.com/search?q=400mm", {
+            "count": "< 10"
+        }),
+        ("https://dmmagazine.blogspot.com/search/label/D%26D", {
+            "range": "1-25",
+            "count": 25,
+        }),
+    )
+
     def __init__(self, match):
         BloggerExtractor.__init__(self, match)
-        label = match.group(3)
+        query = match.group(3)
-        self.label = text.unquote(label) if label else None
+        if query:
+            self.query, self.label = query, None
+        else:
+            self.query, self.label = None, match.group(4)
 
     def posts(self, blog):
-        return self.api.blog_posts(blog["id"], self.label)
+        if self.query:
+            return self.api.blog_search(blog["id"], text.unquote(self.query))
+        return self.api.blog_posts(blog["id"], text.unquote(self.label))
 
 
 class BloggerAPI():
@@ -188,6 +211,11 @@ class BloggerAPI():
         params = {"labels": label}
         return self._pagination(endpoint, params)
 
+    def blog_search(self, blog_id, query):
+        endpoint = "blogs/{}/posts/search".format(blog_id)
+        params = {"q": query}
+        return self._pagination(endpoint, params)
+
     def post_by_path(self, blog_id, path):
         endpoint = "blogs/{}/posts/bypath".format(blog_id)
         return self._call(endpoint, {"path": path}, "post")