From 3ada6a92348ea2133f2eb0b2387ce7fb490e2e67 Mon Sep 17 00:00:00 2001
From: Omar Roth <omarroth@hotmail.com>
Date: Sat, 4 Aug 2018 17:12:58 -0500
Subject: [PATCH] Add filters to '/api/v1/search' endpoint

---
 src/invidious.cr        | 34 +++++++++++++-
 src/invidious/search.cr | 98 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 128 insertions(+), 4 deletions(-)

diff --git a/src/invidious.cr b/src/invidious.cr
index e82f0b9f..0a023345 100644
--- a/src/invidious.cr
+++ b/src/invidious.cr
@@ -2569,14 +2569,44 @@ get "/api/v1/search" do |env|
   page = env.params.query["page"]?.try &.to_i?
   page ||= 1
 
+  sort_by = env.params.query["sort_by"]?.try &.downcase
+  sort_by ||= "relevance"
+
+  date = env.params.query["date"]?.try &.downcase
+  date ||= ""
+
+  duration = env.params.query["date"]?.try &.downcase
+  duration ||= ""
+
+  features = env.params.query["features"]?.try &.split(",").map { |feature| feature.downcase }
+  features ||= [] of String
+
+  # TODO: Support other content types
+  content_type = "video"
+
+  begin
+    search_params = build_search_params(sort_by, date, content_type, duration, features)
+  rescue ex
+    env.response.content_type = "application/json"
+    next JSON.build do |json|
+      json.object do
+        json.field "error", ex.message
+      end
+    end
+  end
+
   client = make_client(YT_URL)
-  html = client.get("/results?q=#{URI.escape(query)}&page=#{page}&sp=EgIQAVAU&disable_polymer=1").body
+  html = client.get("/results?q=#{URI.escape(query)}&page=#{page}&sp=#{search_params}&disable_polymer=1").body
   html = XML.parse_html(html)
 
   results = JSON.build do |json|
     json.array do
       html.xpath_nodes(%q(//ol[@class="item-section"]/li)).each do |node|
-        anchor = node.xpath_node(%q(.//h3[contains(@class,"yt-lockup-title")]/a)).not_nil!
+        anchor = node.xpath_node(%q(.//h3[contains(@class,"yt-lockup-title")]/a))
+        if !anchor
+          next
+        end
+
         if anchor["href"].starts_with? "https://www.googleadservices.com"
           next
         end
diff --git a/src/invidious/search.cr b/src/invidious/search.cr
index 034db789..7714de22 100644
--- a/src/invidious/search.cr
+++ b/src/invidious/search.cr
@@ -1,6 +1,6 @@
-def search(query, page = 1)
+def search(query, page = 1, search_params = build_search_params(content_type: "video"))
   client = make_client(YT_URL)
-  html = client.get("/results?q=#{URI.escape(query)}&page=#{page}&sp=EgIQAVAU").body
+  html = client.get("/results?q=#{URI.escape(query)}&page=#{page}&sp=#{search_params}").body
   html = XML.parse_html(html)
 
   videos = [] of ChannelVideo
@@ -28,3 +28,97 @@ def search(query, page = 1)
 
   return videos
 end
+
+def build_search_params(sort_by = "relevance", date : String = "", content_type : String = "", duration : String = "", features : Array(String) = [] of String)
+  head = "\x08"
+  head += case sort_by
+          when "relevance"
+            "\x00"
+          when "rating"
+            "\x01"
+          when "upload_date"
+            "\x02"
+          when "view_count"
+            "\x03"
+          else
+            raise "No sort #{sort_by}"
+          end
+
+  body = ""
+  body += case date
+          when "hour"
+            "\x08\x01"
+          when "today"
+            "\x08\x02"
+          when "week"
+            "\x08\x03"
+          when "month"
+            "\x08\x04"
+          when "year"
+            "\x08\x05"
+          else
+            ""
+          end
+
+  body += case content_type
+          when "video"
+            "\x10\x01"
+          when "channel"
+            "\x10\x02"
+          when "playlist"
+            "\x10\x03"
+          when "movie"
+            "\x10\x04"
+          when "show"
+            "\x10\x05"
+          else
+            ""
+          end
+
+  body += case duration
+          when "short"
+            "\x18\x01"
+          when "long"
+            "\x18\x02"
+          else
+            ""
+          end
+
+  features.each do |feature|
+    body += case feature
+            when "hd"
+              "\x20\x01"
+            when "subtitles"
+              "\x28\x01"
+            when "creative_commons"
+              "\x30\x01"
+            when "3d"
+              "\x38\x01"
+            when "live"
+              "\x40\x01"
+            when "purchased"
+              "\x48\x01"
+            when "4k"
+              "\x70\x01"
+            when "360"
+              "\x78\x01"
+            when "location"
+              "\xb8\x01\x01"
+            when "hdr"
+              "\xc8\x01\x01"
+            else
+              raise "Unknown feature #{feature}"
+            end
+  end
+
+  if body.size > 0
+    token = head + "\x12" + body.size.to_u8.unsafe_chr + body
+  else
+    token = head
+  end
+
+  token = Base64.urlsafe_encode(token)
+  token = URI.escape(token)
+
+  return token
+end