From f7ca81c38413cc9d9e66551c2dc26aa0de1ad68b Mon Sep 17 00:00:00 2001
From: Omar Roth <omarroth@hotmail.com>
Date: Thu, 13 Sep 2018 17:47:31 -0500
Subject: [PATCH] Add support for channel search

---
 src/invidious.cr                 | 33 ++++++++++-----
 src/invidious/search.cr          | 69 ++++++++++++++++++++++++++++++++
 src/invidious/views/search.ecr   |  2 +-
 src/invidious/views/template.ecr |  2 +-
 4 files changed, 95 insertions(+), 11 deletions(-)

diff --git a/src/invidious.cr b/src/invidious.cr
index 51e4d9d4e..9cf120c56 100644
--- a/src/invidious.cr
+++ b/src/invidious.cr
@@ -432,32 +432,39 @@ get "/search" do |env|
   page = env.params.query["page"]?.try &.to_i?
   page ||= 1
 
-  sort = "relevance"
+  channel = nil
   date = ""
   duration = ""
   features = [] of String
+  sort = "relevance"
 
   operators = query.split(" ").select { |a| a.match(/\w+:[\w,]+/) }
   operators.each do |operator|
     key, value = operator.split(":")
 
     case key
-    when "sort"
-      sort = value
+    when "channel", "user"
+      channel = value
     when "date"
       date = value
     when "duration"
       duration = value
     when "features"
       features = value.split(",")
+    when "sort"
+      sort = value
     end
   end
 
   search_query = (query.split(" ") - operators).join(" ")
 
-  search_params = build_search_params(sort: sort, date: date, content_type: "video",
-    duration: duration, features: features)
-  count, videos = search(search_query, page, search_params).as(Tuple)
+  if channel
+    count, videos = channel_search(search_query, page, channel)
+  else
+    search_params = build_search_params(sort: sort, date: date, content_type: "video",
+      duration: duration, features: features)
+    count, videos = search(search_query, page, search_params).as(Tuple)
+  end
 
   templated "search"
 end
@@ -1666,6 +1673,14 @@ get "/channel/:ucid" do |env|
     auto_generated = true
   end
 
+  if !auto_generated
+    if author.includes? " "
+      env.set "search", "channel:#{ucid} "
+    else
+      env.set "search", "channel:#{author.downcase} "
+    end
+  end
+
   videos = [] of SearchVideo
   2.times do |i|
     url = produce_channel_videos_url(ucid, page * 2 + (i - 1), auto_generated: auto_generated)
@@ -1918,11 +1933,11 @@ get "/api/v1/comments/:id" do |env|
                       url = URI.parse(url)
 
                       if {"m.youtube.com", "www.youtube.com", "youtu.be"}.includes? url.host
-                      if url.path == "/redirect"
-                        url = HTTP::Params.parse(url.query.not_nil!)["q"]
+                        if url.path == "/redirect"
+                          url = HTTP::Params.parse(url.query.not_nil!)["q"]
                         else
                           url = url.full_path
-                      end
+                        end
                       end
                     else
                       url = run["navigationEndpoint"]["commandMetadata"]?.try &.["webCommandMetadata"]["url"].as_s
diff --git a/src/invidious/search.cr b/src/invidious/search.cr
index 6baeba3e8..9e4d277a5 100644
--- a/src/invidious/search.cr
+++ b/src/invidious/search.cr
@@ -12,6 +12,43 @@ class SearchVideo
   })
 end
 
+def channel_search(query, page, channel)
+  client = make_client(YT_URL)
+
+  response = client.get("/user/#{channel}")
+  document = XML.parse_html(response.body)
+  canonical = document.xpath_node(%q(//link[@rel="canonical"]))
+
+  if !canonical
+    response = client.get("/channel/#{channel}")
+    document = XML.parse_html(response.body)
+    canonical = document.xpath_node(%q(//link[@rel="canonical"]))
+  end
+
+  if !canonical
+    return 0, [] of SearchVideo
+  end
+
+  ucid = canonical["href"].split("/")[-1]
+
+  url = produce_channel_search_url(ucid, query, page)
+  response = client.get(url)
+  json = JSON.parse(response.body)
+
+  if json["content_html"]? && !json["content_html"].as_s.empty?
+    document = XML.parse_html(json["content_html"].as_s)
+    nodeset = document.xpath_nodes(%q(//li[contains(@class, "feed-item-container")]))
+
+    count = nodeset.size
+    videos = extract_videos(nodeset)
+  else
+    count = 0
+    videos = [] of SearchVideo
+  end
+
+  return count, videos
+end
+
 def search(query, page = 1, search_params = build_search_params(content_type: "video"))
   client = make_client(YT_URL)
   if query.empty?
@@ -124,3 +161,35 @@ def build_search_params(sort : String = "relevance", date : String = "", content
 
   return token
 end
+
+def produce_channel_search_url(ucid, query, page)
+  page = "#{page}"
+
+  meta = "\x12\x06search0\x02\x38\x01\x60\x01\x6a\x00\x7a"
+  meta += page.size.to_u8.unsafe_chr
+  meta += page
+  meta += "\xb8\x01\x00"
+
+  meta = Base64.urlsafe_encode(meta)
+  meta = URI.escape(meta)
+
+  continuation = "\x12"
+  continuation += ucid.size.to_u8.unsafe_chr
+  continuation += ucid
+  continuation += "\x1a"
+  continuation += meta.size.to_u8.unsafe_chr
+  continuation += meta
+  continuation += "\x5a"
+  continuation += query.size.to_u8.unsafe_chr
+  continuation += query
+
+  continuation = continuation.size.to_u8.unsafe_chr + continuation
+  continuation = "\xe2\xa9\x85\xb2\x02" + continuation
+
+  continuation = Base64.urlsafe_encode(continuation)
+  continuation = URI.escape(continuation)
+
+  url = "/browse_ajax?continuation=#{continuation}"
+
+  return url
+end
diff --git a/src/invidious/views/search.ecr b/src/invidious/views/search.ecr
index 6f6df8e03..5ea7345d8 100644
--- a/src/invidious/views/search.ecr
+++ b/src/invidious/views/search.ecr
@@ -18,7 +18,7 @@
     </div>
     <div class="pure-u-1 pure-u-md-3-5"></div>
     <div style="text-align:right;" class="pure-u-1 pure-u-md-1-5">
-    <% if count == 20 %>
+    <% if count >= 20 %>
         <a href="/search?q=<%= query %>&page=<%= page + 1 %>">Next page</a>
     <% end %>
     </div>
diff --git a/src/invidious/views/template.ecr b/src/invidious/views/template.ecr
index 8a3134deb..1086b3d74 100644
--- a/src/invidious/views/template.ecr
+++ b/src/invidious/views/template.ecr
@@ -28,7 +28,7 @@
         <div class="pure-u-1 pure-u-md-12-24 searchbar">
           <form class="pure-form" action="/search" method="get">
             <fieldset>
-              <input type="search" style="width:100%;" name="q" placeholder="search" value="<%= env.params.query["q"]? %>">
+              <input type="search" style="width:100%;" name="q" placeholder="search" value="<%= env.params.query["q"]? || env.get? "search" %>">
             </fieldset>
           </form>
         </div>