Add a function to build youtube search filters

(it aims at replacing produce_search_params)

spec/invidious/helpers_spec.cr

@@ -29,20 +29,6 @@ Spectator.describe "Helper" do
     end
   end
 
-  describe "#produce_search_params" do
-    it "correctly produces token for searching with specified filters" do
-      expect(produce_search_params).to eq("CAASAhABSAA%3D")
-
-      expect(produce_search_params(sort: "upload_date", content_type: "video")).to eq("CAISAhABSAA%3D")
-
-      expect(produce_search_params(content_type: "playlist")).to eq("CAASAhADSAA%3D")
-
-      expect(produce_search_params(sort: "date", content_type: "video", features: ["hd", "cc", "purchased", "hdr"])).to eq("CAISCxABIAEwAUgByAEBSAA%3D")
-
-      expect(produce_search_params(content_type: "channel")).to eq("CAASAhACSAA%3D")
-    end
-  end
-
   describe "#produce_comment_continuation" do
     it "correctly produces a continuation token for comments" do
       expect(produce_comment_continuation("_cE8xSu6swE", "ADSJ_i2qvJeFtL0htmS5_K5Ctj3eGFVBMWL9Wd42o3kmUL6_mAzdLp85-liQZL0mYr_16BhaggUqX652Sv9JqV6VXinShSP-ZT6rL4NolPBaPXVtJsO5_rA_qE3GubAuLFw9uzIIXU2-HnpXbdgPLWTFavfX206hqWmmpHwUOrmxQV_OX6tYkM3ux3rPAKCDrT8eWL7MU3bLiNcnbgkW8o0h8KYLL_8BPa8LcHbTv8pAoNkjerlX1x7K4pqxaXPoyz89qNlnh6rRx6AXgAzzoHH1dmcyQ8CIBeOHg-m4i8ZxdX4dP88XWrIFg-jJGhpGP8JUMDgZgavxVx225hUEYZMyrLGler5em4FgbG62YWC51moLDLeYEA")).to eq("EkMSC19jRTh4U3U2c3dFyAEA4AEBogINKP___________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%3D")

spec/invidious/search/yt_filters_spec.cr

@@ -0,0 +1,92 @@
+require "../../../src/invidious/search/filters"
+
+require "http/params"
+require "spectator"
+
+Spectator.configure do |config|
+  config.fail_blank
+  config.randomize
+end
+
+# Encoded filter values are extracted from the search
+# page of Youtube with any browser devtools HTML inspector.
+
+DATE_FILTERS = {
+  Invidious::Search::Filters::Date::Hour  => "EgIIAQ%3D%3D",
+  Invidious::Search::Filters::Date::Today => "EgIIAg%3D%3D",
+  Invidious::Search::Filters::Date::Week  => "EgIIAw%3D%3D",
+  Invidious::Search::Filters::Date::Month => "EgIIBA%3D%3D",
+  Invidious::Search::Filters::Date::Year  => "EgIIBQ%3D%3D",
+}
+
+TYPE_FILTERS = {
+  Invidious::Search::Filters::Type::Video    => "EgIQAQ%3D%3D",
+  Invidious::Search::Filters::Type::Channel  => "EgIQAg%3D%3D",
+  Invidious::Search::Filters::Type::Playlist => "EgIQAw%3D%3D",
+  Invidious::Search::Filters::Type::Movie    => "EgIQBA%3D%3D",
+}
+
+DURATION_FILTERS = {
+  Invidious::Search::Filters::Duration::Short  => "EgIYAQ%3D%3D",
+  Invidious::Search::Filters::Duration::Medium => "EgIYAw%3D%3D",
+  Invidious::Search::Filters::Duration::Long   => "EgIYAg%3D%3D",
+}
+
+FEATURE_FILTERS = {
+  Invidious::Search::Filters::Features::Live       => "EgJAAQ%3D%3D",
+  Invidious::Search::Filters::Features::FourK      => "EgJwAQ%3D%3D",
+  Invidious::Search::Filters::Features::HD         => "EgIgAQ%3D%3D",
+  Invidious::Search::Filters::Features::Subtitles  => "EgIoAQ%3D%3D",
+  Invidious::Search::Filters::Features::CCommons   => "EgIwAQ%3D%3D",
+  Invidious::Search::Filters::Features::ThreeSixty => "EgJ4AQ%3D%3D",
+  Invidious::Search::Filters::Features::VR180      => "EgPQAQE%3D",
+  Invidious::Search::Filters::Features::ThreeD     => "EgI4AQ%3D%3D",
+  Invidious::Search::Filters::Features::HDR        => "EgPIAQE%3D",
+  Invidious::Search::Filters::Features::Location   => "EgO4AQE%3D",
+  Invidious::Search::Filters::Features::Purchased  => "EgJIAQ%3D%3D",
+}
+
+SORT_FILTERS = {
+  Invidious::Search::Filters::Sort::Relevance  => "",
+  Invidious::Search::Filters::Sort::UploadDate => "CAI%3D",
+  Invidious::Search::Filters::Sort::Views      => "CAM%3D",
+  Invidious::Search::Filters::Sort::Rating     => "CAE%3D",
+}
+
+Spectator.describe Invidious::Search::Filters do
+  # -------------------
+  #  Encode YT params
+  # -------------------
+
+  describe "#to_yt_params" do
+    sample DATE_FILTERS do |value, result|
+      it "Encodes upload date filter '#{value}'" do
+        expect(described_class.new(date: value).to_yt_params).to eq(result)
+      end
+    end
+
+    sample TYPE_FILTERS do |value, result|
+      it "Encodes content type filter '#{value}'" do
+        expect(described_class.new(type: value).to_yt_params).to eq(result)
+      end
+    end
+
+    sample DURATION_FILTERS do |value, result|
+      it "Encodes duration filter '#{value}'" do
+        expect(described_class.new(duration: value).to_yt_params).to eq(result)
+      end
+    end
+
+    sample FEATURE_FILTERS do |value, result|
+      it "Encodes feature filter '#{value}'" do
+        expect(described_class.new(features: value).to_yt_params).to eq(result)
+      end
+    end
+
+    sample SORT_FILTERS do |value, result|
+      it "Encodes sort filter '#{value}'" do
+        expect(described_class.new(sort: value).to_yt_params).to eq(result)
+      end
+    end
+  end
+end

src/invidious/search/filters.cr

@@ -1,3 +1,6 @@
+require "protodec/utils"
+require "http/params"
+
 module Invidious::Search
   struct Filters
     # Values correspond to { "2:embedded": { "1:varint": <X> }}
@@ -77,6 +80,63 @@ module Invidious::Search
       @features : Features = Features::None,
       @sort : Sort = Sort::Relevance
     )
+    # -------------------
+    #  Youtube params
+    # -------------------
+
+    # Produce the youtube search parameters for the
+    # innertube API (base64-encoded protobuf object).
+    def to_yt_params(page : Int = 1) : String
+      # Initialize the embedded protobuf object
+      embedded = {} of String => Int64
+
+      # Add these field only if associated parameter is selected
+      embedded["1:varint"] = @date.to_i64 if !@date.none?
+      embedded["2:varint"] = @type.to_i64 if !@type.all?
+      embedded["3:varint"] = @duration.to_i64 if !@duration.none?
+
+      if !@features.none?
+        # All features have a value of "1" when enabled, and
+        # the field is omitted when the feature is no selected.
+        embedded["4:varint"] = 1_i64 if @features.includes?(Features::HD)
+        embedded["5:varint"] = 1_i64 if @features.includes?(Features::Subtitles)
+        embedded["6:varint"] = 1_i64 if @features.includes?(Features::CCommons)
+        embedded["7:varint"] = 1_i64 if @features.includes?(Features::ThreeD)
+        embedded["8:varint"] = 1_i64 if @features.includes?(Features::Live)
+        embedded["9:varint"] = 1_i64 if @features.includes?(Features::Purchased)
+        embedded["14:varint"] = 1_i64 if @features.includes?(Features::FourK)
+        embedded["15:varint"] = 1_i64 if @features.includes?(Features::ThreeSixty)
+        embedded["23:varint"] = 1_i64 if @features.includes?(Features::Location)
+        embedded["25:varint"] = 1_i64 if @features.includes?(Features::HDR)
+        embedded["26:varint"] = 1_i64 if @features.includes?(Features::VR180)
+      end
+
+      # Initialize an empty protobuf object
+      object = {} of String => (Int64 | String | Hash(String, Int64))
+
+      # As usual, everything can be omitted if it has no value
+      object["2:embedded"] = embedded if !embedded.empty?
+
+      # Default sort is "relevance", so when this option is selected,
+      # the associated field can be omitted.
+      if !@sort.relevance?
+        object["1:varint"] = @sort.to_i64
+      end
+
+      # Add page number (if provided)
+      if page > 1
+        object["9:varint"] = ((page - 1) * 20).to_i64
+      end
+
+      # If the object is empty, return an empty string,
+      # otherwise encode to protobuf then to base64
+      return "" if object.empty?
+
+      return object
+        .try { |i| Protodec::Any.cast_json(i) }
+        .try { |i| Protodec::Any.from_json(i) }
+        .try { |i| Base64.urlsafe_encode(i) }
+        .try { |i| URI.encode_www_form(i) }
     end
   end
 end