From 79e99908def94a44c22af649c12ab0387151e7e9 Mon Sep 17 00:00:00 2001
From: Andre Borie <hi@rjevski.io>
Date: Sat, 30 Jan 2021 14:52:48 +0000
Subject: [PATCH] Allow providing 12-Factor-style Database URL in config

---
 config/config.example.yml        |  2 ++
 src/invidious.cr                 | 13 ++-----------
 src/invidious/helpers/helpers.cr | 30 +++++++++++++++++++++++++-----
 src/invidious/users.cr           | 14 ++++++++++++++
 4 files changed, 43 insertions(+), 16 deletions(-)

diff --git a/config/config.example.yml b/config/config.example.yml
index e83a7515..e8330705 100644
--- a/config/config.example.yml
+++ b/config/config.example.yml
@@ -6,6 +6,8 @@ db:
   host: localhost
   port: 5432
   dbname: invidious
+# alternatively, the database URL can be provided directly - if both are set then the latter takes precedence
+# database_url: postgres://kemal:kemal@localhost:5432/invidious
 full_refresh: false
 https_only: false
 domain:
diff --git a/src/invidious.cr b/src/invidious.cr
index 12145d8b..a0702820 100644
--- a/src/invidious.cr
+++ b/src/invidious.cr
@@ -33,16 +33,7 @@ require "./invidious/jobs/**"
 CONFIG   = Config.load
 HMAC_KEY = CONFIG.hmac_key || Random::Secure.hex(32)
 
-PG_URL = URI.new(
-  scheme: "postgres",
-  user: CONFIG.db.user,
-  password: CONFIG.db.password,
-  host: CONFIG.db.host,
-  port: CONFIG.db.port,
-  path: CONFIG.db.dbname,
-)
-
-PG_DB           = DB.open PG_URL
+PG_DB           = DB.open CONFIG.database_url
 ARCHIVE_URL     = URI.parse("https://archive.org")
 LOGIN_URL       = URI.parse("https://accounts.google.com")
 PUBSUB_URL      = URI.parse("https://pubsubhubbub.appspot.com")
@@ -192,7 +183,7 @@ if CONFIG.captcha_key
 end
 
 connection_channel = Channel({Bool, Channel(PQ::Notification)}).new(32)
-Invidious::Jobs.register Invidious::Jobs::NotificationJob.new(connection_channel, PG_URL)
+Invidious::Jobs.register Invidious::Jobs::NotificationJob.new(connection_channel, CONFIG.database_url)
 
 Invidious::Jobs.start_all
 
diff --git a/src/invidious/helpers/helpers.cr b/src/invidious/helpers/helpers.cr
index 00087143..a591b5eb 100644
--- a/src/invidious/helpers/helpers.cr
+++ b/src/invidious/helpers/helpers.cr
@@ -64,11 +64,14 @@ end
 class Config
   include YAML::Serializable
 
-  property channel_threads : Int32 = 1             # Number of threads to use for crawling videos from channels (for updating subscriptions)
-  property feed_threads : Int32 = 1                # Number of threads to use for updating feeds
-  property output : String = "STDOUT"              # Log file path or STDOUT
-  property log_level : LogLevel = LogLevel::Info   # Default log level, valid YAML values are ints and strings, see src/invidious/helpers/logger.cr
-  property db : DBConfig                           # Database configuration
+  property channel_threads : Int32 = 1           # Number of threads to use for crawling videos from channels (for updating subscriptions)
+  property feed_threads : Int32 = 1              # Number of threads to use for updating feeds
+  property output : String = "STDOUT"            # Log file path or STDOUT
+  property log_level : LogLevel = LogLevel::Info # Default log level, valid YAML values are ints and strings, see src/invidious/helpers/logger.cr
+  property db : DBConfig? = nil                  # Database configuration with separate parameters (username, hostname, etc)
+
+  @[YAML::Field(converter: Preferences::URIConverter)]
+  property database_url : URI = URI.parse("")      # Database configuration using 12-Factor "Database URL" syntax
   property decrypt_polling : Bool = true           # Use polling to keep decryption function up to date
   property full_refresh : Bool = false             # Used for crawling channels: threads should check all videos uploaded by a channel
   property https_only : Bool?                      # Used to tell Invidious it is behind a proxy, so links to resources should be https://
@@ -170,6 +173,23 @@ class Config
         end
     {% end %}
 
+    # Build database_url from db.* if it's not set directly
+    if config.database_url.to_s.empty?
+      if db = config.db
+        config.database_url = URI.new(
+          scheme: "postgres",
+          user: db.user,
+          password: db.password,
+          host: db.host,
+          port: db.port,
+          path: db.dbname,
+        )
+      else
+        puts "Config : Either database_url or db.* is required"
+        exit(1)
+      end
+    end
+
     return config
   end
 end
diff --git a/src/invidious/users.cr b/src/invidious/users.cr
index 153e3b6a..7a948b76 100644
--- a/src/invidious/users.cr
+++ b/src/invidious/users.cr
@@ -173,6 +173,20 @@ struct Preferences
     end
   end
 
+  module URIConverter
+    def self.to_yaml(value : URI, yaml : YAML::Nodes::Builder)
+      yaml.scalar value.normalize!
+    end
+
+    def self.from_yaml(ctx : YAML::ParseContext, node : YAML::Nodes::Node) : URI
+      if node.is_a?(YAML::Nodes::Scalar)
+        URI.parse node.value
+      else
+        node.raise "Expected scalar, not #{node.class}"
+      end
+    end
+  end
+
   module ProcessString
     def self.to_json(value : String, json : JSON::Builder)
       json.string value