nicoseiga: fix regression with http redirects.

3cdf67920 changed it so that Danbooru::Http follows redirects by
default. This broke some things in the Nico Seiga strategy, so disable
following redirects in the Nico Seiga API client for now.

Also change it so that Danbooru::Http follows redirects after a POST
request (by setting `strict: false`). Nico Seiga needs this because it
sends a redirect after we POST the login form.

app/logical/danbooru/http.rb

@@ -6,7 +6,7 @@ module Danbooru
     attr_writer :cache, :http
 
     class << self
-      delegate :get, :put, :post, :delete, :cache, :timeout, :auth, :basic_auth, :headers, to: :new
+      delegate :get, :put, :post, :delete, :cache, :follow, :timeout, :auth, :basic_auth, :headers, to: :new
     end
 
     def get(url, **options)
@@ -29,6 +29,10 @@ module Danbooru
       dup.tap { |o| o.cache = expiry.to_i }
     end
 
+    def follow(*args)
+      dup.tap { |o| o.http = o.http.follow(*args) }
+    end
+
     def timeout(*args)
       dup.tap { |o| o.http = o.http.timeout(*args) }
     end
@@ -77,7 +81,7 @@ module Danbooru
 
     def http
       @http ||= ::HTTP.
-        follow(max_hops: MAX_REDIRECTS).
+        follow(strict: false, max_hops: MAX_REDIRECTS).
         timeout(DEFAULT_TIMEOUT).
         use(:auto_inflate).
         headers(Danbooru.config.http_headers).

app/logical/nico_seiga_api_client.rb

@@ -2,9 +2,13 @@ class NicoSeigaApiClient
   extend Memoist
   XML_API = "https://seiga.nicovideo.jp/api"
 
-  def initialize(work_id:, type:)
+  attr_reader :http
+
+  # XXX temp disable following redirects.
+  def initialize(work_id:, type:, http: Danbooru::Http.follow(nil))
     @work_id = work_id
     @work_type = type
+    @http = http
   end
 
   def image_ids
@@ -51,7 +55,7 @@ class NicoSeigaApiClient
       api_response = JSON.parse(resp)["target_image"]
 
     elsif @work_type == "manga"
-      resp = Danbooru::Http.cache(1.minute).get("#{XML_API}/theme/info?id=#{@work_id}")
+      resp = http.cache(1.minute).get("#{XML_API}/theme/info?id=#{@work_id}")
       return {} if resp.blank? || resp.code.to_i == 404
       api_response = Hash.from_xml(resp.to_s)["response"]["theme"]
     end
@@ -70,7 +74,7 @@ class NicoSeigaApiClient
   end
 
   def user_api_response(user_id)
-    resp = Danbooru::Http.cache(1.minute).get("#{XML_API}/user/info?id=#{user_id}")
+    resp = http.cache(1.minute).get("#{XML_API}/user/info?id=#{user_id}")
     return {} if resp.blank? || resp.code.to_i == 404
     Hash.from_xml(resp.to_s)["response"]["user"]
   end
@@ -78,11 +82,11 @@ class NicoSeigaApiClient
   def get(url)
     cookie_header = Cache.get("nicoseiga-cookie-header") || regenerate_cookie_header
 
-    resp = Danbooru::Http.headers({Cookie: cookie_header}).cache(1.minute).get(url)
+    resp = http.headers({Cookie: cookie_header}).cache(1.minute).get(url)
 
     if resp.headers["Location"] =~ %r{seiga\.nicovideo\.jp/login/}i
       cookie_header = regenerate_cookie_header
-      resp = Danbooru::Http.headers({Cookie: cookie_header}).cache(1.minute).get(url)
+      resp = http.headers({Cookie: cookie_header}).cache(1.minute).get(url)
     end
 
     resp
@@ -93,7 +97,7 @@ class NicoSeigaApiClient
       mail_tel: Danbooru.config.nico_seiga_login,
       password: Danbooru.config.nico_seiga_password
     }
-    resp = Danbooru::Http.post("https://account.nicovideo.jp/api/v1/login", form: form)
+    resp = http.post("https://account.nicovideo.jp/api/v1/login", form: form)
     cookies = resp.cookies.map { |c| c.name + "=" + c.value }
     cookies << "accept_fetish_warning=2"