[vipr] add image extractor (#1258)

* [vipr] add image extractor

Adds support for images hosted on https://vipr.im

* Fix codestyle issues

docs/supportedsites.rst

@@ -147,6 +147,7 @@ Imxto                https://imx.to/                     individual Images
 Pixhost              https://pixhost.to/                 individual Images
 Postimg              https://postimages.org/             individual Images
 Turboimagehost       https://www.turboimagehost.com/     individual Images
+Vipr                 https://vipr.im/                    individual Images
 かべうち                 https://kabe-uchiroom.com/          User Profiles
 もえぴりあ                https://vanilla-rock.com/           Posts, Tag Searches
 半次元                  https://bcy.net/                    Posts, User Profiles

gallery_dl/extractor/imagehosts.py

@@ -249,3 +249,19 @@ class TurboimagehostImageExtractor(ImagehostImageExtractor):
     def get_info(self, page):
         url = text.extract(page, 'src="', '"', page.index("<img "))[0]
         return url, url
+
+
+class ViprImageExtractor(ImagehostImageExtractor):
+    """Extractor for single images from vipr.im"""
+    category = "vipr"
+    pattern = (r"(?:https?://)?(vipr\.im"
+               r"/[^/?#]+(\.html)?)")
+    https = True
+    params = None
+
+    def get_info(self, page):
+        url, pos = text.extract(
+            page,
+            '<p style="display: block; text-align:center;"><img src="', '"'
+        )
+        return url, url