Add pinterest domain and asset domains for link preview support

Signal/translations/en.lproj/Localizable.strings

@@ -2166,7 +2166,7 @@
 "SETTINGS_LINK_PREVIEWS" = "Send Link Previews";
 
 /* Footer for setting for enabling & disabling link previews. */
-"SETTINGS_LINK_PREVIEWS_FOOTER" = "Previews are supported for Imgur, Instagram, Reddit, and YouTube links.";
+"SETTINGS_LINK_PREVIEWS_FOOTER" = "Previews are supported for Imgur, Instagram, Pinterest, Reddit, and YouTube links.";
 
 /* Header for setting for enabling & disabling link previews. */
 "SETTINGS_LINK_PREVIEWS_HEADER" = "Link Previews";

SignalServiceKit/src/Messages/Interactions/OWSLinkPreview.swift

@@ -311,7 +311,12 @@ public class OWSLinkPreview: MTLModel {
         // Instagram
         "instagram.com",
         "www.instagram.com",
-        "m.instagram.com"
+        "m.instagram.com",
+
+        // Pinterest
+        "pinterest.com",
+        "www.pinterest.com",
+        "pin.it"
     ]
 
     // For media domains, we DO NOT require an exact match - subdomains are allowed.
@@ -327,7 +332,10 @@ public class OWSLinkPreview: MTLModel {
 
         // Instagram
         "cdninstagram.com",
-        "fbcdn.net"
+        "fbcdn.net",
+
+        // Pinterest
+        "pinimg.com"
     ]
 
     private static let protocolWhitelist = [

SignalServiceKit/tests/Messages/OWSLinkPreviewTest.swift

@@ -130,6 +130,9 @@ class OWSLinkPreviewTest: SSKBaseTestSwift {
         XCTAssertTrue(OWSLinkPreview.isValidLinkUrl("https://www.instagram.com/p/BrgpsUjF9Jo/?utm_source=ig_web_button_share_sheet"))
         XCTAssertTrue(OWSLinkPreview.isValidLinkUrl("https://www.instagram.com/p/BrgpsUjF9Jo/?utm_source=ig_share_sheet&igshid=94c7ihqjfmbm"))
         XCTAssertTrue(OWSLinkPreview.isValidLinkUrl("https://imgur.com/gallery/igHOwDM"))
+        XCTAssertTrue(OWSLinkPreview.isValidLinkUrl("https://pinterest.com/something"))
+        XCTAssertTrue(OWSLinkPreview.isValidLinkUrl("https://www.pinterest.com/something"))
+        XCTAssertTrue(OWSLinkPreview.isValidLinkUrl("https://pin.it/something"))
 
         // Strip trailing commas.
         XCTAssertTrue(OWSLinkPreview.isValidLinkUrl("https://imgur.com/gallery/igHOwDM,"))
@@ -171,6 +174,7 @@ class OWSLinkPreviewTest: SSKBaseTestSwift {
         XCTAssertTrue(OWSLinkPreview.isValidMediaUrl("https://scontent-mia3-2.cdninstagram.com/vp/9035a7d6b32e6f840856661e4a11e3cf/5CFC285B/t51.2885-15/e35/47690175_2275988962411653_1145978227188801192_n.jpg?_nc_ht=scontent-mia3-2.cdninstagram.com"))
         XCTAssertTrue(OWSLinkPreview.isValidMediaUrl("https://scontent-mia3-2.cdninstagram.com/vp/9035a7d6b32e6f840856661e4a11e3cf/5CFC285B/t51.2885-15/e35/47690175_2275988962411653_1145978227188801192_n.jpg?_nc_ht=scontent-mia3-2.cdninstagram.com"))
         XCTAssertTrue(OWSLinkPreview.isValidMediaUrl("https://i.imgur.com/PYiyLv1.jpg?fbplay"))
+        XCTAssertTrue(OWSLinkPreview.isValidMediaUrl("https://pinimg.com/something"))
     }
 
     func testPreviewUrlForMessageBodyText() {