diff --git a/lib/posts/json_feed.rb b/lib/posts/json_feed.rb
index 920c49e..345ffe7 100644
--- a/lib/posts/json_feed.rb
+++ b/lib/posts/json_feed.rb
@@ -60,7 +60,8 @@ module Pressa
         permalink = @site.url_for(post.path)
 
         item = {}
-        item[:url] = post.link_post? ? post.link : permalink
+        item[:url] = permalink
+        item[:external_url] = post.link if post.link_post?
         item[:tags] = post.tags unless post.tags.empty?
         item[:content_html] = content_html
         item[:title] = post.link_post? ? "→ #{post.title}" : post.title
diff --git a/lib/posts/writer.rb b/lib/posts/writer.rb
index 70c9f92..e934a5b 100644
--- a/lib/posts/writer.rb
+++ b/lib/posts/writer.rb
@@ -132,12 +132,11 @@ module Pressa
           page_scripts:,
           page_styles:,
           page_description:,
-          page_type:
+          page_type:,
+          content:
         )
 
-        layout.call do
-          content.call
-        end
+        layout.call
       end
     end
   end
diff --git a/lib/projects/plugin.rb b/lib/projects/plugin.rb
index 3c1650d..2e9c1bd 100644
--- a/lib/projects/plugin.rb
+++ b/lib/projects/plugin.rb
@@ -75,12 +75,11 @@ module Pressa
           canonical_url:,
           page_scripts:,
           page_styles:,
-          page_description:
+          page_description:,
+          content:
         )
 
-        layout.call do
-          content.call
-        end
+        layout.call
       end
     end
   end
diff --git a/lib/site_generator.rb b/lib/site_generator.rb
index babc92d..c45d451 100644
--- a/lib/site_generator.rb
+++ b/lib/site_generator.rb
@@ -10,6 +10,8 @@ module Pressa
     end
 
     def generate(source_path:, target_path:)
+      validate_paths!(source_path:, target_path:)
+
       FileUtils.rm_rf(target_path)
       FileUtils.mkdir_p(target_path)
 
@@ -23,6 +25,22 @@ module Pressa
 
     private
 
+    def validate_paths!(source_path:, target_path:)
+      source_abs = absolute_path(source_path)
+      target_abs = absolute_path(target_path)
+      return unless contains_path?(container: target_abs, path: source_abs)
+
+      raise ArgumentError, 'target_path must not be the same as or contain source_path'
+    end
+
+    def absolute_path(path)
+      File.exist?(path) ? File.realpath(path) : File.expand_path(path)
+    end
+
+    def contains_path?(container:, path:)
+      path == container || path.start_with?("#{container}#{File::SEPARATOR}")
+    end
+
     def copy_static_files(source_path, target_path)
       public_dir = File.join(source_path, 'public')
       return unless Dir.exist?(public_dir)
diff --git a/lib/utils/markdown_renderer.rb b/lib/utils/markdown_renderer.rb
index c4aaad6..b30c27a 100644
--- a/lib/utils/markdown_renderer.rb
+++ b/lib/utils/markdown_renderer.rb
@@ -5,10 +5,6 @@ require_relative '../site'
 require_relative '../views/layout'
 require_relative '../views/icons'
 
-class String
-  include Phlex::SGML::SafeObject
-end
-
 module Pressa
   module Utils
     class MarkdownRenderer
@@ -90,13 +86,11 @@ module Pressa
           page_subtitle:,
           canonical_url:,
           page_description:,
-          page_type:
+          page_type:,
+          content: PageView.new(page_title: page_subtitle, body:)
         )
 
-        content_view = PageView.new(page_title: page_subtitle, body:)
-        layout.call do
-          content_view.call
-        end
+        layout.call
       end
 
       class PageView < Phlex::HTML
@@ -108,12 +102,12 @@ module Pressa
         def view_template
           article(class: 'container') do
             h1 { @page_title }
-            raw(@body)
+            raw(safe(@body))
           end
 
           div(class: 'row clearfix') do
             p(class: 'fin') do
-              raw(Views::Icons.code)
+              raw(safe(Views::Icons.code))
             end
           end
         end
diff --git a/lib/views/feed_post_view.rb b/lib/views/feed_post_view.rb
index 57ba351..653e414 100644
--- a/lib/views/feed_post_view.rb
+++ b/lib/views/feed_post_view.rb
@@ -11,7 +11,7 @@ module Pressa
       def view_template
         div do
           p(class: 'time') { @post.formatted_date }
-          raw(@post.body)
+          raw(safe(@post.body))
           p do
             a(class: 'permalink', href: @site.url_for(@post.path)) { '∞' }
           end
diff --git a/lib/views/layout.rb b/lib/views/layout.rb
index df5e39a..483359a 100644
--- a/lib/views/layout.rb
+++ b/lib/views/layout.rb
@@ -12,7 +12,8 @@ module Pressa
                   :page_type,
                   :canonical_url,
                   :page_scripts,
-                  :page_styles
+                  :page_styles,
+                  :content
 
       def initialize(
         site:,
@@ -21,7 +22,8 @@ module Pressa
         page_description: nil,
         page_type: 'website',
         page_scripts: [],
-        page_styles: []
+        page_styles: [],
+        content: nil
       )
         @site = site
         @page_subtitle = page_subtitle
@@ -30,13 +32,14 @@ module Pressa
         @canonical_url = canonical_url
         @page_scripts = page_scripts
         @page_styles = page_styles
+        @content = content
       end
 
       def format_output?
         true
       end
 
-      def view_template(&block)
+      def view_template
         doctype
 
         html(lang: 'en') do
@@ -92,7 +95,7 @@ module Pressa
 
           body do
             render_header
-            instance_exec(&block) if block
+            render(content) if content
             render_footer
             render_scripts
           end
@@ -140,17 +143,17 @@ module Pressa
             ul do
               li(class: 'mastodon') do
                 a(rel: 'me', 'aria-label': 'Mastodon', href: 'https://techhub.social/@sjs') do
-                  raw(Icons.mastodon)
+                  raw(safe(Icons.mastodon))
                 end
               end
               li(class: 'github') do
                 a('aria-label': 'GitHub', href: 'https://github.com/samsonjs') do
-                  raw(Icons.github)
+                  raw(safe(Icons.github))
                 end
               end
               li(class: 'rss') do
                 a('aria-label': 'RSS', href: site.url_for('/feed.xml')) do
-                  raw(Icons.rss)
+                  raw(safe(Icons.rss))
                 end
               end
             end
diff --git a/lib/views/post_view.rb b/lib/views/post_view.rb
index 6a27879..d6cc155 100644
--- a/lib/views/post_view.rb
+++ b/lib/views/post_view.rb
@@ -1,10 +1,6 @@
 require 'phlex'
 require_relative 'icons'
 
-class String
-  include Phlex::SGML::SafeObject
-end
-
 module Pressa
   module Views
     class PostView < Phlex::HTML
@@ -28,12 +24,12 @@ module Pressa
             a(href: @post.path, class: 'permalink') { '∞' }
           end
 
-          raw(@post.body)
+          raw(safe(@post.body))
         end
 
         div(class: 'row clearfix') do
           p(class: 'fin') do
-            raw(Icons.code)
+            raw(safe(Icons.code))
           end
         end
       end
diff --git a/lib/views/project_view.rb b/lib/views/project_view.rb
index 6a8e495..458a6a4 100644
--- a/lib/views/project_view.rb
+++ b/lib/views/project_view.rb
@@ -44,7 +44,7 @@ module Pressa
 
         div(class: 'row clearfix') do
           p(class: 'fin') do
-            raw(Icons.code)
+            raw(safe(Icons.code))
           end
         end
 
diff --git a/lib/views/projects_view.rb b/lib/views/projects_view.rb
index d1d221c..3481a73 100644
--- a/lib/views/projects_view.rb
+++ b/lib/views/projects_view.rb
@@ -25,7 +25,7 @@ module Pressa
 
         div(class: 'row clearfix') do
           p(class: 'fin') do
-            raw(Icons.code)
+            raw(safe(Icons.code))
           end
         end
       end
diff --git a/spec/posts/json_feed_spec.rb b/spec/posts/json_feed_spec.rb
new file mode 100644
index 0000000..4944deb
--- /dev/null
+++ b/spec/posts/json_feed_spec.rb
@@ -0,0 +1,73 @@
+require 'spec_helper'
+require 'json'
+require 'tmpdir'
+
+RSpec.describe Pressa::Posts::JSONFeedWriter do
+  let(:site) do
+    Pressa::Site.new(
+      author: 'Sami Samhuri',
+      email: 'sami@samhuri.net',
+      title: 'samhuri.net',
+      description: 'blog',
+      url: 'https://samhuri.net',
+      image_url: 'https://samhuri.net/images/me.jpg'
+    )
+  end
+
+  let(:posts_by_year) { double('posts_by_year', recent_posts: [post]) }
+  let(:writer) { described_class.new(site:, posts_by_year:) }
+
+  context 'for link posts' do
+    let(:post) do
+      Pressa::Posts::Post.new(
+        slug: 'github-flow-like-a-pro',
+        title: 'GitHub Flow Like a Pro',
+        author: 'Sami Samhuri',
+        date: DateTime.parse('2015-05-28T07:42:27-07:00'),
+        formatted_date: '28th May, 2015',
+        link: 'http://haacked.com/archive/2014/07/28/github-flow-aliases/',
+        body: '<p>hello</p>',
+        excerpt: 'hello...',
+        path: '/posts/2015/05/github-flow-like-a-pro'
+      )
+    end
+
+    it 'uses permalink as url and keeps external_url for destination links' do
+      Dir.mktmpdir do |dir|
+        writer.write_feed(target_path: dir, limit: 30)
+        feed = JSON.parse(File.read(File.join(dir, 'feed.json')))
+        item = feed.fetch('items').first
+
+        expect(item.fetch('id')).to eq('https://samhuri.net/posts/2015/05/github-flow-like-a-pro')
+        expect(item.fetch('url')).to eq('https://samhuri.net/posts/2015/05/github-flow-like-a-pro')
+        expect(item.fetch('external_url')).to eq('http://haacked.com/archive/2014/07/28/github-flow-aliases/')
+      end
+    end
+  end
+
+  context 'for regular posts' do
+    let(:post) do
+      Pressa::Posts::Post.new(
+        slug: 'swift-optional-or',
+        title: 'Swift Optional OR',
+        author: 'Sami Samhuri',
+        date: DateTime.parse('2017-10-01T10:00:00-07:00'),
+        formatted_date: '1st October, 2017',
+        body: '<p>hello</p>',
+        excerpt: 'hello...',
+        path: '/posts/2017/10/swift-optional-or'
+      )
+    end
+
+    it 'omits external_url' do
+      Dir.mktmpdir do |dir|
+        writer.write_feed(target_path: dir, limit: 30)
+        feed = JSON.parse(File.read(File.join(dir, 'feed.json')))
+        item = feed.fetch('items').first
+
+        expect(item.fetch('url')).to eq('https://samhuri.net/posts/2017/10/swift-optional-or')
+        expect(item).not_to have_key('external_url')
+      end
+    end
+  end
+end
diff --git a/spec/site_generator_spec.rb b/spec/site_generator_spec.rb
new file mode 100644
index 0000000..786e312
--- /dev/null
+++ b/spec/site_generator_spec.rb
@@ -0,0 +1,33 @@
+require 'spec_helper'
+require 'fileutils'
+require 'tmpdir'
+
+RSpec.describe Pressa::SiteGenerator do
+  let(:site) do
+    Pressa::Site.new(
+      author: 'Sami Samhuri',
+      email: 'sami@samhuri.net',
+      title: 'samhuri.net',
+      description: 'blog',
+      url: 'https://samhuri.net',
+      plugins: [],
+      renderers: []
+    )
+  end
+
+  it 'rejects a target path that matches the source path' do
+    Dir.mktmpdir do |dir|
+      FileUtils.mkdir_p(File.join(dir, 'public'))
+      source_file = File.join(dir, 'public', 'keep.txt')
+      File.write(source_file, 'safe')
+
+      generator = described_class.new(site:)
+
+      expect {
+        generator.generate(source_path: dir, target_path: dir)
+      }.to raise_error(ArgumentError, /must not be the same as or contain source_path/)
+
+      expect(File.read(source_file)).to eq('safe')
+    end
+  end
+end
diff --git a/spec/views/layout_spec.rb b/spec/views/layout_spec.rb
new file mode 100644
index 0000000..3325ab5
--- /dev/null
+++ b/spec/views/layout_spec.rb
@@ -0,0 +1,45 @@
+require 'spec_helper'
+
+RSpec.describe Pressa::Views::Layout do
+  class TestContentView < Phlex::HTML
+    def view_template
+      article do
+        h1 { 'Hello' }
+      end
+    end
+  end
+
+  let(:site) do
+    Pressa::Site.new(
+      author: 'Sami Samhuri',
+      email: 'sami@samhuri.net',
+      title: 'samhuri.net',
+      description: 'blog',
+      url: 'https://samhuri.net'
+    )
+  end
+
+  it 'renders child components as HTML instead of escaped text' do
+    html = described_class.new(
+      site:,
+      canonical_url: 'https://samhuri.net/posts/',
+      content: TestContentView.new
+    ).call
+
+    expect(html).to include('<article>')
+    expect(html).to include('<h1>Hello</h1>')
+    expect(html).not_to include('&lt;article&gt;')
+  end
+
+  it 'keeps escaping enabled for untrusted string fields' do
+    subtitle = '<img src=x onerror=alert(1)>'
+    html = described_class.new(
+      site:,
+      canonical_url: 'https://samhuri.net/posts/',
+      page_subtitle: subtitle,
+      content: TestContentView.new
+    ).call
+
+    expect(html).to include('<title>samhuri.net: &lt;img src=x onerror=alert(1)&gt;</title>')
+  end
+end